505 files changed, 145087 insertions, 0 deletions

diff --git a/pigeonhole/src/Makefile.am b/pigeonhole/src/Makefile.am
new file mode 100644
index 0000000..85c1e44
--- /dev/null
+++ b/pigeonhole/src/Makefile.am
@@ -0,0 +1,21 @@
+
+
+sieve_subdirs = \
+	lib-sieve \
+	plugins \
+	lib-sieve-tool \
+	sieve-tools \
+	testsuite
+
+if BUILD_MANAGESIEVE
+managesieve_subdirs = \
+	lib-managesieve \
+	managesieve \
+	managesieve-login
+else
+managesieve_subdirs =
+endif
+
+SUBDIRS = \
+	$(sieve_subdirs) \
+	$(managesieve_subdirs)
diff --git a/pigeonhole/src/Makefile.in b/pigeonhole/src/Makefile.in
new file mode 100644
index 0000000..4b09bcb
--- /dev/null
+++ b/pigeonhole/src/Makefile.in
@@ -0,0 +1,709 @@
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+	managesieve-parser.c
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+	  case '$(am__configure_deps)' in \
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+	  $(AUTOMAKE) --foreign src/lib-managesieve/Makefile
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+	  *config.status*) \
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+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
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+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
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+	@list='$(noinst_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+libmanagesieve.la: $(libmanagesieve_la_OBJECTS) $(libmanagesieve_la_DEPENDENCIES) $(EXTRA_libmanagesieve_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(LINK)  $(libmanagesieve_la_OBJECTS) $(libmanagesieve_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
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+distclean-compile:
+	-rm -f *.tab.c
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+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/managesieve-arg.Plo@am__quote@ # am--include-marker
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+	      $$unique; \
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+	fi
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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+	fi
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+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
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+		-rm -f ./$(DEPDIR)/managesieve-arg.Plo
+	-rm -f ./$(DEPDIR)/managesieve-parser.Plo
+	-rm -f ./$(DEPDIR)/managesieve-quote.Plo
+	-rm -f Makefile
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+		-rm -f ./$(DEPDIR)/managesieve-arg.Plo
+	-rm -f ./$(DEPDIR)/managesieve-parser.Plo
+	-rm -f ./$(DEPDIR)/managesieve-quote.Plo
+	-rm -f Makefile
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+.PRECIOUS: Makefile
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+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-managesieve/managesieve-arg.c b/pigeonhole/src/lib-managesieve/managesieve-arg.c
new file mode 100644
index 0000000..178bf45
--- /dev/null
+++ b/pigeonhole/src/lib-managesieve/managesieve-arg.c
@@ -0,0 +1,207 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "strescape.h"
+#include "managesieve-arg.h"
+
+bool managesieve_arg_get_atom(const struct managesieve_arg *arg,
+			      const char **str_r)
+{
+	if (arg->type != MANAGESIEVE_ARG_ATOM)
+		return FALSE;
+
+	*str_r = arg->_data.str;
+	return TRUE;
+}
+
+bool managesieve_arg_get_number(const struct managesieve_arg *arg,
+				uoff_t *number_r)
+{
+	const char *data;
+	uoff_t num = 0;
+	size_t i;
+
+	if (arg->type != MANAGESIEVE_ARG_ATOM)
+		return FALSE;
+
+	data = arg->_data.str;
+	for (i = 0; i < arg->str_len; i++) {
+		uoff_t newnum;
+
+		if (data[i] < '0' || data[i] > '9')
+			return FALSE;
+
+		newnum = num*10 + (data[i] -'0');
+		if (newnum < num)
+			return FALSE;
+
+		num = newnum;
+	}
+
+	*number_r = num;
+	return TRUE;
+}
+
+bool managesieve_arg_get_quoted(const struct managesieve_arg *arg,
+				const char **str_r)
+{
+	if (arg->type != MANAGESIEVE_ARG_STRING)
+		return FALSE;
+
+	*str_r = arg->_data.str;
+	return TRUE;
+}
+
+bool managesieve_arg_get_string(const struct managesieve_arg *arg,
+				const char **str_r)
+{
+	if (arg->type != MANAGESIEVE_ARG_STRING &&
+	    arg->type != MANAGESIEVE_ARG_LITERAL)
+		return FALSE;
+
+	*str_r = arg->_data.str;
+	return TRUE;
+}
+
+bool managesieve_arg_get_string_stream(const struct managesieve_arg *arg,
+				       struct istream **stream_r)
+{
+	if (arg->type != MANAGESIEVE_ARG_STRING_STREAM)
+		return FALSE;
+
+	*stream_r = arg->_data.str_stream;
+	return TRUE;
+}
+
+bool managesieve_arg_get_list(const struct managesieve_arg *arg,
+			      const struct managesieve_arg **list_r)
+{
+	unsigned int count;
+
+	return managesieve_arg_get_list_full(arg, list_r, &count);
+}
+
+bool managesieve_arg_get_list_full(const struct managesieve_arg *arg,
+				   const struct managesieve_arg **list_r,
+				   unsigned int *list_count_r)
+{
+	unsigned int count;
+
+	if (arg->type != MANAGESIEVE_ARG_LIST)
+		return FALSE;
+
+	*list_r = array_get(&arg->_data.list, &count);
+
+	/* drop MANAGESIEVE_ARG_EOL from list size */
+	i_assert(count > 0);
+	*list_count_r = count - 1;
+	return TRUE;
+}
+
+const char *managesieve_arg_as_atom(const struct managesieve_arg *arg)
+{
+	const char *str;
+
+	if (!managesieve_arg_get_atom(arg, &str))
+		i_unreached();
+	return str;
+}
+
+const char *managesieve_arg_as_string(const struct managesieve_arg *arg)
+{
+	const char *str;
+
+	if (!managesieve_arg_get_string(arg, &str))
+		i_unreached();
+	return str;
+}
+
+struct istream *
+managesieve_arg_as_string_stream(const struct managesieve_arg *arg)
+{
+	struct istream *stream;
+
+	if (!managesieve_arg_get_string_stream(arg, &stream))
+		i_unreached();
+	return stream;
+}
+
+const struct managesieve_arg *
+managesieve_arg_as_list(const struct managesieve_arg *arg)
+{
+	const struct managesieve_arg *ret;
+
+	if (!managesieve_arg_get_list(arg, &ret))
+		i_unreached();
+	return ret;
+}
+
+bool managesieve_arg_atom_equals(const struct managesieve_arg *arg,
+				 const char *str)
+{
+	const char *value;
+
+	if (!managesieve_arg_get_atom(arg, &value))
+		return FALSE;
+	return strcasecmp(value, str) == 0;
+}
+
+void managesieve_write_arg(string_t *dest, const struct managesieve_arg *arg)
+{
+	const char *strval;
+
+	switch (arg->type) {
+	case MANAGESIEVE_ARG_ATOM:
+		str_append(dest, managesieve_arg_as_atom(arg));
+		break;
+	case MANAGESIEVE_ARG_STRING:
+		strval = managesieve_arg_as_string(arg);
+		str_append_c(dest, '"');
+		str_append_escaped(dest, strval, strlen(strval));
+		str_append_c(dest, '"');
+		break;
+	case MANAGESIEVE_ARG_STRING_STREAM:
+		str_append(dest, "\"<too large>\"");
+		break;
+	case MANAGESIEVE_ARG_LITERAL: {
+		const char *strarg = managesieve_arg_as_string(arg);
+		str_printfa(dest, "{%zu}\r\n",
+			    strlen(strarg));
+		str_append(dest, strarg);
+		break;
+	}
+	case MANAGESIEVE_ARG_LIST:
+		str_append_c(dest, '(');
+		managesieve_write_args(dest, managesieve_arg_as_list(arg));
+		str_append_c(dest, ')');
+		break;
+	case MANAGESIEVE_ARG_NONE:
+	case MANAGESIEVE_ARG_EOL:
+		i_unreached();
+	}
+}
+
+void managesieve_write_args(string_t *dest, const struct managesieve_arg *args)
+{
+	bool first = TRUE;
+
+	for (; !MANAGESIEVE_ARG_IS_EOL(args); args++) {
+		if (first)
+			first = FALSE;
+		else
+			str_append_c(dest, ' ');
+		managesieve_write_arg(dest, args);
+	}
+}
+
+const char *managesieve_args_to_str(const struct managesieve_arg *args)
+{
+	string_t *str;
+
+	str = t_str_new(128);
+	managesieve_write_args(str, args);
+	return str_c(str);
+}
+
diff --git a/pigeonhole/src/lib-managesieve/managesieve-arg.h b/pigeonhole/src/lib-managesieve/managesieve-arg.h
new file mode 100644
index 0000000..23f7c05
--- /dev/null
+++ b/pigeonhole/src/lib-managesieve/managesieve-arg.h
@@ -0,0 +1,117 @@
+#ifndef MANAGESIEVE_ARG_H
+#define MANAGESIEVE_ARG_H
+
+#include "array.h"
+
+/*
+ * QUOTED-SPECIALS    = <"> / "\"
+ */
+#define IS_QUOTED_SPECIAL(c) \
+	((c) == '"' || (c) == '\\')
+
+/*
+ * ATOM-SPECIALS      = "(" / ")" / "{" / SP / CTL / QUOTED-SPECIALS
+ */
+#define IS_ATOM_SPECIAL(c) \
+	((c) == '(' || (c) == ')' || (c) == '{' || \
+	 (c) <= 32 || (c) == 0x7f || \
+	 IS_QUOTED_SPECIAL(c))
+
+/*
+ * CHAR               = %x01-7F
+ */
+#define IS_CHAR(c) \
+	(((c) & 0x80) == 0)
+
+/*
+ * TEXT-CHAR          = %x01-09 / %x0B-0C / %x0E-7F
+ *                       ;; any CHAR except CR and LF
+ */
+#define IS_TEXT_CHAR(c) \
+	(IS_CHAR(c) && (c) != '\r' && (c) != '\n')
+
+/*
+ * SAFE-CHAR          = %x01-09 / %x0B-0C / %x0E-21 /
+ *                      %x23-5B / %x5D-7F
+ *                      ;; any TEXT-CHAR except QUOTED-SPECIALS
+ */
+#define IS_SAFE_CHAR(c) \
+	(IS_TEXT_CHAR(c) && !IS_QUOTED_SPECIAL(c))
+
+enum managesieve_arg_type {
+	MANAGESIEVE_ARG_NONE = 0,
+	MANAGESIEVE_ARG_ATOM,
+	MANAGESIEVE_ARG_STRING,
+	MANAGESIEVE_ARG_STRING_STREAM,
+
+	MANAGESIEVE_ARG_LIST,
+
+	/* literals are returned as MANAGESIEVE_ARG_STRING by default */
+	MANAGESIEVE_ARG_LITERAL,
+
+	MANAGESIEVE_ARG_EOL /* end of argument list */
+};
+
+ARRAY_DEFINE_TYPE(managesieve_arg_list, struct managesieve_arg);
+struct managesieve_arg {
+	enum managesieve_arg_type type;
+	/* parent argument; always of type MANAGESIEVE_ARG_LIST */
+	struct managesieve_arg *parent;
+
+	/* Set when _data.str is set */
+	size_t str_len;
+
+	union {
+		const char *str;
+		struct istream *str_stream;
+		ARRAY_TYPE(managesieve_arg_list) list;
+	} _data;
+};
+
+#define MANAGESIEVE_ARG_IS_EOL(arg) \
+	((arg)->type == MANAGESIEVE_ARG_EOL)
+
+bool managesieve_arg_get_atom(const struct managesieve_arg *arg,
+			      const char **str_r) ATTR_WARN_UNUSED_RESULT;
+bool managesieve_arg_get_number(const struct managesieve_arg *arg,
+				uoff_t *number_r) ATTR_WARN_UNUSED_RESULT;
+bool managesieve_arg_get_quoted(const struct managesieve_arg *arg,
+				const char **str_r) ATTR_WARN_UNUSED_RESULT;
+bool managesieve_arg_get_string(const struct managesieve_arg *arg,
+				const char **str_r) ATTR_WARN_UNUSED_RESULT;
+
+bool managesieve_arg_get_string_stream(const struct managesieve_arg *arg,
+				       struct istream **stream_r)
+				       ATTR_WARN_UNUSED_RESULT;
+
+bool managesieve_arg_get_list(const struct managesieve_arg *arg,
+			      const struct managesieve_arg **list_r)
+			      ATTR_WARN_UNUSED_RESULT;
+bool managesieve_arg_get_list_full(const struct managesieve_arg *arg,
+				   const struct managesieve_arg **list_r,
+				   unsigned int *list_count_r)
+				   ATTR_WARN_UNUSED_RESULT;
+
+/* Similar to above, but assumes that arg is already of correct type. */
+const char *managesieve_arg_as_atom(const struct managesieve_arg *arg);
+const char *managesieve_arg_as_string(const struct managesieve_arg *arg);
+struct istream *
+managesieve_arg_as_string_stream(const struct managesieve_arg *arg);
+const struct managesieve_arg *
+managesieve_arg_as_list(const struct managesieve_arg *arg);
+
+/* Returns TRUE if arg is atom and case-insensitively matches str */
+bool managesieve_arg_atom_equals(const struct managesieve_arg *arg,
+				 const char *str);
+
+/* Write ManageSieve arg to the given string. Because
+   MANAGESIVE_ARG_LITERAL_SIZE* have no content, they're written as
+   "{size}\r\n<too large>". */
+void managesieve_write_arg(string_t *dest, const struct managesieve_arg *arg);
+/* Same as managesieve_write_arg(), but write all the args until EOL. */
+void managesieve_write_args(string_t *dest, const struct managesieve_arg *args);
+/* Like managesieve_write_args(), but return the string allocated from data
+   stack. */
+const char *managesieve_args_to_str(const struct managesieve_arg *args);
+
+#endif
diff --git a/pigeonhole/src/lib-managesieve/managesieve-parser.c b/pigeonhole/src/lib-managesieve/managesieve-parser.c
new file mode 100644
index 0000000..546e431
--- /dev/null
+++ b/pigeonhole/src/lib-managesieve/managesieve-parser.c
@@ -0,0 +1,757 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "unichar.h"
+#include "istream-private.h"
+#include "ostream.h"
+#include "strescape.h"
+#include "managesieve-parser.h"
+
+#define is_linebreak(c) \
+	((c) == '\r' || (c) == '\n')
+
+#define LIST_INIT_COUNT 7
+
+enum arg_parse_type {
+	ARG_PARSE_NONE = 0,
+	ARG_PARSE_ATOM,
+	ARG_PARSE_STRING,
+	ARG_PARSE_LITERAL,
+	ARG_PARSE_LITERAL_DATA
+};
+
+struct managesieve_parser {
+	/* permanent */
+	pool_t pool;
+	struct istream *input;
+	size_t max_line_size;
+	enum managesieve_parser_flags flags;
+
+	/* reset by managesieve_parser_reset(): */
+	size_t line_size;
+	ARRAY_TYPE(managesieve_arg_list) root_list;
+	ARRAY_TYPE(managesieve_arg_list) *cur_list;
+	struct managesieve_arg *list_arg;
+
+	enum arg_parse_type cur_type;
+	size_t cur_pos; /* parser position in input buffer */
+
+	int str_first_escape; /* ARG_PARSE_STRING: index to first '\' */
+	uoff_t literal_size; /* ARG_PARSE_LITERAL: string size */
+
+	struct istream *str_stream;
+
+	const char *error;
+
+	bool literal_skip_crlf:1;
+	bool literal_nonsync:1;
+	bool eol:1;
+	bool fatal_error:1;
+};
+
+static struct istream *quoted_string_istream_create
+	(struct managesieve_parser *parser);
+
+struct managesieve_parser *
+managesieve_parser_create(struct istream *input, size_t max_line_size)
+{
+	struct managesieve_parser *parser;
+
+	parser = i_new(struct managesieve_parser, 1);
+	parser->pool = pool_alloconly_create("MANAGESIEVE parser", 8192);
+	parser->input = input;
+	parser->max_line_size = max_line_size;
+
+	p_array_init(&parser->root_list, parser->pool, LIST_INIT_COUNT);
+	parser->cur_list = &parser->root_list;
+	return parser;
+}
+
+void managesieve_parser_destroy(struct managesieve_parser **parser)
+{
+	i_stream_unref(&(*parser)->str_stream);
+
+	pool_unref(&(*parser)->pool);
+	i_free(*parser);
+	*parser = NULL;
+}
+
+void managesieve_parser_reset(struct managesieve_parser *parser)
+{
+	p_clear(parser->pool);
+
+	parser->line_size = 0;
+
+	p_array_init(&parser->root_list, parser->pool, LIST_INIT_COUNT);
+	parser->cur_list = &parser->root_list;
+	parser->list_arg = NULL;
+
+	parser->cur_type = ARG_PARSE_NONE;
+	parser->cur_pos = 0;
+
+	parser->str_first_escape = 0;
+	parser->literal_size = 0;
+
+	parser->error = NULL;
+
+	parser->literal_skip_crlf = FALSE;
+	parser->eol = FALSE;
+
+	i_stream_unref(&parser->str_stream);
+}
+
+const char *
+managesieve_parser_get_error(struct managesieve_parser *parser, bool *fatal)
+{
+	*fatal = parser->fatal_error;
+	return parser->error;
+}
+
+/* Skip over everything parsed so far, plus the following whitespace */
+static bool
+managesieve_parser_skip_to_next(struct managesieve_parser *parser,
+				const unsigned char **data, size_t *data_size)
+{
+	size_t i;
+
+	for (i = parser->cur_pos; i < *data_size; i++) {
+		if ((*data)[i] != ' ')
+			break;
+	}
+
+	parser->line_size += i;
+	i_stream_skip(parser->input, i);
+	parser->cur_pos = 0;
+
+	*data += i;
+	*data_size -= i;
+	return *data_size > 0;
+}
+
+static struct managesieve_arg *
+managesieve_arg_create(struct managesieve_parser *parser)
+{
+	struct managesieve_arg *arg;
+
+	arg = array_append_space(parser->cur_list);
+	arg->parent = parser->list_arg;
+
+	return arg;
+}
+
+static void
+managesieve_parser_save_arg(struct managesieve_parser *parser,
+			    const unsigned char *data, size_t size)
+{
+	struct managesieve_arg *arg;
+	char *str;
+
+	arg = managesieve_arg_create(parser);
+
+	switch (parser->cur_type) {
+	case ARG_PARSE_ATOM:
+		/* Simply save the string */
+		arg->type = MANAGESIEVE_ARG_ATOM;
+		arg->_data.str = p_strndup(parser->pool, data, size);
+		arg->str_len = size;
+		break;
+	case ARG_PARSE_STRING:
+		/* Data is quoted and may contain escapes. */
+		if ((parser->flags &
+		     MANAGESIEVE_PARSE_FLAG_STRING_STREAM) != 0) {
+			arg->type = MANAGESIEVE_ARG_STRING_STREAM;
+			arg->_data.str_stream = parser->str_stream;
+		} else {
+			i_assert(size > 0);
+
+			arg->type = MANAGESIEVE_ARG_STRING;
+			str = p_strndup(parser->pool, data+1, size-1);
+
+			/* remove the escapes */
+			if (parser->str_first_escape >= 0 &&
+			    (parser->flags &
+			     MANAGESIEVE_PARSE_FLAG_NO_UNESCAPE) == 0)
+				(void)str_unescape(str);
+
+			arg->_data.str = str;
+			arg->str_len = strlen(str);
+		}
+		break;
+	case ARG_PARSE_LITERAL_DATA:
+		if ((parser->flags &
+		     MANAGESIEVE_PARSE_FLAG_STRING_STREAM) != 0) {
+			arg->type = MANAGESIEVE_ARG_STRING_STREAM;
+			arg->_data.str_stream = parser->str_stream;
+		} else if ((parser->flags &
+			    MANAGESIEVE_PARSE_FLAG_LITERAL_TYPE) != 0) {
+			arg->type = MANAGESIEVE_ARG_LITERAL;
+			arg->_data.str = p_strndup(parser->pool, data, size);
+			arg->str_len = size;
+		} else {
+			arg->type = MANAGESIEVE_ARG_STRING;
+			arg->_data.str = p_strndup(parser->pool, data, size);
+			arg->str_len = size;
+		}
+		break;
+	default:
+		i_unreached();
+	}
+
+	parser->cur_type = ARG_PARSE_NONE;
+}
+
+static bool is_valid_atom_char(struct managesieve_parser *parser, char chr)
+{
+	if (IS_ATOM_SPECIAL((unsigned char)chr)) {
+		parser->error = "Invalid characters in atom";
+		return FALSE;
+	} else if ((((unsigned char)chr) & 0x80) != 0) {
+		parser->error = "8bit data in atom";
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+static bool
+managesieve_parser_read_atom(struct managesieve_parser *parser,
+			     const unsigned char *data, size_t data_size)
+{
+	size_t i;
+
+	/* Read until we've found space, CR or LF. */
+	for (i = parser->cur_pos; i < data_size; i++) {
+		if (data[i] == ' ' || data[i] == ')' ||
+		    is_linebreak(data[i])) {
+			managesieve_parser_save_arg(parser, data, i);
+			break;
+		} else if (!is_valid_atom_char(parser, data[i]))
+			return FALSE;
+	}
+
+	parser->cur_pos = i;
+	return (parser->cur_type == ARG_PARSE_NONE);
+}
+
+static bool
+managesieve_parser_read_string(struct managesieve_parser *parser,
+			       const unsigned char *data, size_t data_size)
+{
+	size_t i;
+
+	/* QUOTED-CHAR        = SAFE-UTF8-CHAR / "\" QUOTED-SPECIALS
+	   quoted             = <"> *QUOTED-CHAR <">
+	                      ;; limited to 1024 octets between the <">s
+	 */
+
+	/* Read until we've found non-escaped ", CR or LF */
+	for (i = parser->cur_pos; i < data_size; i++) {
+		if (data[i] == '"') {
+			if (!uni_utf8_data_is_valid(data+1, i-1)) {
+				parser->error =
+					"Invalid UTF-8 character in quoted-string.";
+				return FALSE;
+			}
+
+			managesieve_parser_save_arg(parser, data, i);
+			i++; /* skip the trailing '"' too */
+			break;
+		}
+
+		if (data[i] == '\0') {
+			parser->error = "NULs not allowed in strings";
+			return FALSE;
+		}
+
+		if (data[i] == '\\') {
+			if (i+1 == data_size) {
+				/* Known data ends with '\' - leave it to next
+				   time as well if it happens to be \" */
+				break;
+			}
+
+			/* Save the first escaped char */
+			if (parser->str_first_escape < 0)
+				parser->str_first_escape = i;
+
+			/* Skip the escaped char */
+			i++;
+
+			if (!IS_QUOTED_SPECIAL(data[i])) {
+				parser->error =
+					"Escaped quoted-string character is not a QUOTED-SPECIAL.";
+				return FALSE;
+			}
+			continue;
+		}
+
+		if ((data[i] & 0x80) == 0 && !IS_SAFE_CHAR(data[i])) {
+			parser->error = "String contains invalid character.";
+			return FALSE;
+		}
+	}
+
+	parser->cur_pos = i;
+	return (parser->cur_type == ARG_PARSE_NONE);
+}
+
+static bool managesieve_parser_literal_end(struct managesieve_parser *parser)
+{
+	if ((parser->flags & MANAGESIEVE_PARSE_FLAG_STRING_STREAM) == 0) {
+		if (parser->line_size >= parser->max_line_size ||
+		    (parser->literal_size >
+		     (parser->max_line_size - parser->line_size))) {
+			/* Too long string, abort. */
+			parser->error = "Literal size too large";
+			parser->fatal_error = TRUE;
+			return FALSE;
+		}
+	}
+
+	parser->cur_type = ARG_PARSE_LITERAL_DATA;
+	parser->literal_skip_crlf = TRUE;
+
+	parser->cur_pos = 0;
+	return TRUE;
+}
+
+static bool
+managesieve_parser_read_literal(struct managesieve_parser *parser,
+				const unsigned char *data, size_t data_size)
+{
+	size_t i;
+
+	/* Expecting digits + "}" */
+	for (i = parser->cur_pos; i < data_size; i++) {
+		if (data[i] == '}') {
+			parser->line_size += i+1;
+			i_stream_skip(parser->input, i+1);
+
+			return managesieve_parser_literal_end(parser);
+		}
+
+		if (parser->literal_nonsync) {
+			parser->error = "Expecting '}' after '+'";
+			return FALSE;
+		}
+
+		if (data[i] == '+') {
+			parser->literal_nonsync = TRUE;
+			continue;
+		}
+
+		if (data[i] < '0' || data[i] > '9') {
+			parser->error = "Invalid literal size";
+			return FALSE;
+		}
+
+		if (parser->literal_size >= ((uoff_t)-1 / 10)) {
+			if (parser->literal_size > ((uoff_t)-1 / 10) ||
+			    (uoff_t)(data[i] - '0') > ((uoff_t)-1 % 10)) {
+				parser->error = "Literal size too large";
+				return FALSE;
+			}
+		}
+		parser->literal_size = parser->literal_size * 10 +
+				       (data[i] - '0');
+	}
+
+	parser->cur_pos = i;
+	return FALSE;
+}
+
+static bool
+managesieve_parser_read_literal_data(struct managesieve_parser *parser,
+				     const unsigned char *data,
+				     size_t data_size)
+{
+	if (parser->literal_skip_crlf) {
+		/* Skip \r\n or \n, anything else gives an error */
+		if (data_size == 0)
+			return FALSE;
+
+		if (*data == '\r') {
+			parser->line_size++;
+			data++; data_size--;
+			i_stream_skip(parser->input, 1);
+
+			if (data_size == 0)
+				return FALSE;
+		}
+
+		if (*data != '\n') {
+			parser->error = "Missing LF after literal size";
+			return FALSE;
+		}
+
+		parser->line_size++;
+		data++; data_size--;
+		i_stream_skip(parser->input, 1);
+
+		parser->literal_skip_crlf = FALSE;
+
+		i_assert(parser->cur_pos == 0);
+	}
+
+	if ((parser->flags & MANAGESIEVE_PARSE_FLAG_STRING_STREAM) == 0) {
+		/* Now we just wait until we've read enough data */
+		if (data_size < parser->literal_size) {
+			return FALSE;
+		} else {
+			if (!uni_utf8_data_is_valid(
+				data, (size_t)parser->literal_size)) {
+				parser->error =
+					"Invalid UTF-8 character in literal string.";
+				return FALSE;
+			}
+
+			managesieve_parser_save_arg(
+				parser, data, (size_t)parser->literal_size);
+			parser->cur_pos = (size_t)parser->literal_size;
+			return TRUE;
+		}
+	} else {
+		/* We don't read the data; we just create a stream for the
+		   literal */
+		parser->eol = TRUE;
+		parser->str_stream = i_stream_create_limit(
+			parser->input, parser->literal_size);
+		managesieve_parser_save_arg(parser, NULL, 0);
+		return TRUE;
+	}
+}
+
+/* Returns TRUE if argument was fully processed. Also returns TRUE if an
+   argument inside a list was processed. */
+static bool managesieve_parser_read_arg(struct managesieve_parser *parser)
+{
+	const unsigned char *data;
+	size_t data_size;
+
+	data = i_stream_get_data(parser->input, &data_size);
+	if (data_size == 0)
+		return FALSE;
+
+	while (parser->cur_type == ARG_PARSE_NONE) {
+		/* We haven't started parsing yet */
+		if (!managesieve_parser_skip_to_next(parser, &data, &data_size))
+			return FALSE;
+		i_assert(parser->cur_pos == 0);
+
+		switch (data[0]) {
+		case '\r':
+		case '\n':
+			/* Unexpected end of line */
+			parser->eol = TRUE;
+			return FALSE;
+		case '"':
+			parser->cur_type = ARG_PARSE_STRING;
+			parser->str_first_escape = -1;
+			break;
+		case '{':
+			parser->cur_type = ARG_PARSE_LITERAL;
+			parser->literal_size = 0;
+			parser->literal_nonsync = FALSE;
+			break;
+		default:
+			if (!is_valid_atom_char(parser, data[0]))
+				return FALSE;
+			parser->cur_type = ARG_PARSE_ATOM;
+			break;
+		}
+		parser->cur_pos++;
+	}
+
+	i_assert(data_size > 0);
+
+	switch (parser->cur_type) {
+	case ARG_PARSE_ATOM:
+		if (!managesieve_parser_read_atom(parser, data, data_size))
+			return FALSE;
+		break;
+	case ARG_PARSE_STRING:
+		if ((parser->flags &
+		     MANAGESIEVE_PARSE_FLAG_STRING_STREAM) != 0) {
+			parser->eol = TRUE;
+			parser->line_size += parser->cur_pos;
+			i_stream_skip(parser->input, parser->cur_pos);
+			parser->cur_pos = 0;
+			parser->str_stream =
+				quoted_string_istream_create(parser);
+			managesieve_parser_save_arg(parser, NULL, 0);
+
+		} else if (!managesieve_parser_read_string(parser,
+							   data, data_size)) {
+			return FALSE;
+		}
+		break;
+	case ARG_PARSE_LITERAL:
+		if (!managesieve_parser_read_literal(parser, data, data_size))
+			return FALSE;
+
+		/* Pass through to parsing data. since input->skip was
+		   modified, we need to get the data start position again. */
+		data = i_stream_get_data(parser->input, &data_size);
+
+		/* fall through */
+	case ARG_PARSE_LITERAL_DATA:
+		if (!managesieve_parser_read_literal_data(parser,
+							  data, data_size))
+			return FALSE;
+		break;
+	default:
+		i_unreached();
+	}
+
+	i_assert(parser->cur_type == ARG_PARSE_NONE);
+	return TRUE;
+}
+
+/* ARG_PARSE_NONE checks that last argument isn't only partially parsed. */
+#define IS_UNFINISHED(parser) \
+	((parser)->cur_type != ARG_PARSE_NONE || \
+	(parser)->cur_list != &parser->root_list)
+
+static int
+finish_line(struct managesieve_parser *parser, unsigned int count,
+	    const struct managesieve_arg **args_r)
+{
+	struct managesieve_arg *arg;
+	int ret = array_count(&parser->root_list);
+
+	parser->line_size += parser->cur_pos;
+	i_stream_skip(parser->input, parser->cur_pos);
+	parser->cur_pos = 0;
+
+	/* Fill the missing parameters with NILs */
+	while (count > array_count(&parser->root_list)) {
+		arg = array_append_space(&parser->root_list);
+		arg->type = MANAGESIEVE_ARG_NONE;
+	}
+	arg = array_append_space(&parser->root_list);
+	arg->type = MANAGESIEVE_ARG_EOL;
+
+	*args_r = array_get(&parser->root_list, &count);
+	return ret;
+}
+
+int managesieve_parser_read_args(struct managesieve_parser *parser,
+				 unsigned int count,
+				 enum managesieve_parser_flags flags,
+				 const struct managesieve_arg **args_r)
+{
+	parser->flags = flags;
+
+	while (!parser->eol && (count == 0 || IS_UNFINISHED(parser) ||
+	       array_count(&parser->root_list) < count)) {
+		if (!managesieve_parser_read_arg(parser))
+			break;
+
+		if (parser->line_size > parser->max_line_size) {
+			parser->error = "MANAGESIEVE command line too large";
+			break;
+		}
+	}
+
+	if (parser->error != NULL) {
+		/* Error, abort */
+		parser->line_size += parser->cur_pos;
+		i_stream_skip(parser->input, parser->cur_pos);
+		parser->cur_pos = 0;
+		*args_r = NULL;
+		return -1;
+	} else if ((!IS_UNFINISHED(parser) && count > 0 &&
+		    array_count(&parser->root_list) >= count) || parser->eol) {
+		/* All arguments read / end of line. */
+		return finish_line(parser, count, args_r);
+	} else {
+		/* Need more data */
+		*args_r = NULL;
+		return -2;
+	}
+}
+
+int managesieve_parser_finish_line(struct managesieve_parser *parser,
+				   unsigned int count,
+				   enum managesieve_parser_flags flags,
+				   const struct managesieve_arg **args_r)
+{
+	const unsigned char *data;
+	size_t data_size;
+	int ret;
+
+	ret = managesieve_parser_read_args(parser, count, flags, args_r);
+	if (ret == -2) {
+		/* We should have noticed end of everything except atom */
+		if (parser->cur_type == ARG_PARSE_ATOM) {
+			data = i_stream_get_data(parser->input, &data_size);
+			managesieve_parser_save_arg(parser, data, data_size);
+		}
+	}
+	return finish_line(parser, count, args_r);
+}
+
+const char *managesieve_parser_read_word(struct managesieve_parser *parser)
+{
+	const unsigned char *data;
+	size_t i, data_size;
+
+	data = i_stream_get_data(parser->input, &data_size);
+
+	for (i = 0; i < data_size; i++) {
+		if (data[i] == ' ' || data[i] == '\r' || data[i] == '\n')
+			break;
+	}
+
+	if (i < data_size) {
+		data_size = i + (data[i] == ' ' ? 1 : 0);
+		parser->line_size += data_size;
+		i_stream_skip(parser->input, data_size);
+		return p_strndup(parser->pool, data, i);
+	} else {
+		return NULL;
+	}
+}
+
+/*
+ * Quoted string stream
+ */
+
+struct quoted_string_istream {
+	struct istream_private istream;
+
+	/* The end '"' was found */
+	bool str_end:1;
+};
+
+static int
+quoted_string_istream_read_parent(struct quoted_string_istream *qsstream,
+				  unsigned int min_bytes)
+{
+	struct istream_private *stream = &qsstream->istream;
+	size_t size, avail;
+	ssize_t ret;
+
+	size = i_stream_get_data_size(stream->parent);
+	while (size < min_bytes) {
+		ret = i_stream_read_memarea(stream->parent);
+		if (ret <= 0) {
+			if (ret == -2) {
+				/* Tiny parent buffer size - shouldn't happen */
+				return -2;
+			}
+			stream->istream.stream_errno =
+				stream->parent->stream_errno;
+			stream->istream.eof = stream->parent->eof;
+			if (ret == -1 && stream->istream.stream_errno == 0) {
+				io_stream_set_error(&stream->iostream,
+					"Quoted string ends without closing quotes");
+				stream->istream.stream_errno = EPIPE;
+			}
+			return ret;
+		}
+		size = i_stream_get_data_size(stream->parent);
+	}
+
+	if (!i_stream_try_alloc(stream, size, &avail))
+		return -2;
+	return 1;
+}
+
+static ssize_t quoted_string_istream_read(struct istream_private *stream)
+{
+	struct quoted_string_istream *qsstream =
+		(struct quoted_string_istream *)stream;
+	const unsigned char *data;
+	unsigned int extra;
+	size_t i, dest, size;
+	ssize_t ret;
+
+	if (qsstream->str_end) {
+		stream->istream.eof = TRUE;
+		return -1;
+	}
+
+	ret = quoted_string_istream_read_parent(qsstream, 1);
+	if (ret <= 0)
+		return ret;
+
+	/* @UNSAFE */
+	dest = stream->pos;
+	extra = 0;
+
+	data = i_stream_get_data(stream->parent, &size);
+	for (i = 0; i < size && dest < stream->buffer_size; ) {
+		if (data[i] == '"') {
+			i++;
+			qsstream->str_end = TRUE;
+			if (dest == stream->pos) {
+				i_stream_skip(stream->parent, i);
+				stream->istream.eof = TRUE;
+				return -1;
+			}
+			break;
+		} else if (data[i] == '\\') {
+			if (i+1 == size) {
+				/* Not enough input for \x */
+				extra = 1;
+				break;
+			}
+			i++;
+
+			if (!IS_QUOTED_SPECIAL(data[i])) {
+				/* Invalid string */
+				io_stream_set_error(&stream->iostream,
+					"Escaped quoted-string character is not a QUOTED-SPECIAL");
+				stream->istream.stream_errno = EINVAL;
+				return -1;
+			}
+			stream->w_buffer[dest++] = data[i];
+			i++;
+		} else {
+			if (data[i] == '\r' || data[i] == '\n') {
+				io_stream_set_error(&stream->iostream,
+					"Quoted string contains an invalid character");
+				stream->istream.stream_errno = EINVAL;
+				return -1;
+			}
+
+			stream->w_buffer[dest++] = data[i];
+			i++;
+		}
+		i_assert(dest <= stream->buffer_size);
+	}
+	i_stream_skip(stream->parent, i);
+
+	ret = dest - stream->pos;
+	if (ret == 0) {
+		/* Not enough input */
+		i_assert(i == 0);
+		i_assert(extra > 0);
+		ret = quoted_string_istream_read_parent(qsstream, extra+1);
+		if (ret <= 0)
+			return ret;
+		return quoted_string_istream_read(stream);
+	}
+	i_assert(ret > 0);
+	stream->pos = dest;
+	return ret;
+}
+
+static struct
+istream *quoted_string_istream_create(struct managesieve_parser *parser)
+{
+	struct quoted_string_istream *qsstream;
+
+	qsstream = i_new(struct quoted_string_istream, 1);
+	qsstream->istream.max_buffer_size =
+		parser->input->real_stream->max_buffer_size;
+	qsstream->istream.read = quoted_string_istream_read;
+
+	qsstream->istream.istream.readable_fd = FALSE;
+	qsstream->istream.istream.blocking = parser->input->blocking;
+	qsstream->istream.istream.seekable = FALSE;
+	return i_stream_create(&qsstream->istream, parser->input,
+			       i_stream_get_fd(parser->input), 0);
+}
diff --git a/pigeonhole/src/lib-managesieve/managesieve-parser.h b/pigeonhole/src/lib-managesieve/managesieve-parser.h
new file mode 100644
index 0000000..93e67ae
--- /dev/null
+++ b/pigeonhole/src/lib-managesieve/managesieve-parser.h
@@ -0,0 +1,67 @@
+#ifndef MANAGESIEVE_PARSER_H
+#define MANAGESIEVE_PARSER_H
+
+#include "managesieve-arg.h"
+
+enum managesieve_parser_flags {
+	/* Set this flag if you want to read a string argument as as stream.
+	   Useful when you need to deal with large strings. The string must be
+	   the last read argument. */
+	MANAGESIEVE_PARSE_FLAG_STRING_STREAM = 0x01,
+	/* Don't remove '\' chars from string arguments */
+	MANAGESIEVE_PARSE_FLAG_NO_UNESCAPE	= 0x02,
+	/* Return literals as MANAGESIEVE_ARG_LITERAL instead of
+	   MANAGESIEVE_ARG_STRING */
+	MANAGESIEVE_PARSE_FLAG_LITERAL_TYPE	= 0x04
+};
+
+struct managesieve_parser;
+
+/* Create new MANAGESIEVE argument parser.
+
+   max_line_size can be used to approximately limit the maximum amount of memory
+   that gets allocated when parsing a line. Input buffer size limits the maximum
+   size of each parsed token.
+
+   Usually the largest lines are large only because they have a one huge message
+   set token, so you'll probably want to keep input buffer size the same as
+   max_line_size. That means the maximum memory usage is around
+   2 * max_line_size. */
+struct managesieve_parser *
+managesieve_parser_create(struct istream *input, size_t max_line_size);
+void managesieve_parser_destroy(struct managesieve_parser **parser);
+
+/* Reset the parser to initial state. */
+void managesieve_parser_reset(struct managesieve_parser *parser);
+
+/* Return the last error in parser. fatal is set to TRUE if there's no way to
+   continue parsing, currently only if too large non-sync literal size was
+   given. */
+const char *
+managesieve_parser_get_error(struct managesieve_parser *parser, bool *fatal);
+
+/* Read a number of arguments. This function doesn't call i_stream_read(), you
+   need to do that. Returns number of arguments read (may be less than count
+   in case of EOL), -2 if more data is needed or -1 if error occurred.
+
+   count-sized array of arguments are stored into args when return value is 0 or
+   larger. If all arguments weren't read, they're set to NIL. count can be set
+   to 0 to read all arguments in the line. Last element in args is always of
+   type MANAGESIEVE_ARG_EOL. */
+int managesieve_parser_read_args(struct managesieve_parser *parser,
+				 unsigned int count,
+				 enum managesieve_parser_flags flags,
+				 const struct managesieve_arg **args_r);
+
+/* Just like managesieve_parser_read_args(), but assume \n at end of data in
+   input stream. */
+int managesieve_parser_finish_line(struct managesieve_parser *parser,
+				   unsigned int count,
+				   enum managesieve_parser_flags flags,
+				   const struct managesieve_arg **args_r);
+
+/* Read one word - used for reading command name. Returns NULL if more data is
+   needed. */
+const char *managesieve_parser_read_word(struct managesieve_parser *parser);
+
+#endif
diff --git a/pigeonhole/src/lib-managesieve/managesieve-quote.c b/pigeonhole/src/lib-managesieve/managesieve-quote.c
new file mode 100644
index 0000000..a86818c
--- /dev/null
+++ b/pigeonhole/src/lib-managesieve/managesieve-quote.c
@@ -0,0 +1,121 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "unichar.h"
+#include "managesieve-parser.h"
+#include "managesieve-quote.h"
+
+/* Turn the value string into a valid MANAGESIEVE string or literal, no matter
+ * what. QUOTED-SPECIALS are escaped, but any invalid (UTF-8) character
+ * is simply removed. Linebreak characters are not considered invalid, but
+ * they do force the generation of a string literal.
+ */
+void managesieve_quote_append(string_t *str, const unsigned char *value,
+		       size_t value_len, bool compress_lwsp)
+{
+	size_t i, extra = 0, escape = 0;
+	string_t *tmp;
+	bool
+		last_lwsp = TRUE,
+		literal = FALSE,
+		modify = FALSE;
+
+ 	if (value == NULL) {
+		str_append(str, "\"\"");
+		return;
+	}
+
+	if (value_len == (size_t)-1)
+		value_len = strlen((const char *) value);
+
+	for (i = 0; i < value_len; i++) {
+		switch (value[i]) {
+		case ' ':
+		case '\t':
+			if (last_lwsp && compress_lwsp) {
+				modify = TRUE;
+				extra++;
+			}
+			last_lwsp = TRUE;
+			break;
+		case '"':
+		case '\\':
+			escape++;
+			last_lwsp = FALSE;
+			break;
+		case 13:
+		case 10:
+			literal = TRUE;
+			last_lwsp = TRUE;
+			break;
+		default:
+			last_lwsp = FALSE;
+		}
+	}
+
+	if (!literal) {
+		/* no linebreak chars, return as (escaped) "string" */
+		str_append_c(str, '"');
+	} else {
+		/* return as literal */
+		str_printfa(str, "{%zu}\r\n", value_len - extra);
+	}
+
+	tmp = t_str_new(value_len+escape+4);
+	if (!modify && (literal || escape == 0))
+		str_append_data(tmp, value, value_len);
+	else {
+		last_lwsp = TRUE;
+		for (i = 0; i < value_len; i++) {
+			switch (value[i]) {
+			case '"':
+			case '\\':
+				last_lwsp = FALSE;
+				if (!literal)
+					str_append_c(tmp, '\\');
+				str_append_c(tmp, value[i]);
+				break;
+			case ' ':
+			case '\t':
+				if (!last_lwsp || !compress_lwsp)
+					str_append_c(tmp, ' ');
+				last_lwsp = TRUE;
+				break;
+			case 13:
+			case 10:
+				last_lwsp = TRUE;
+				str_append_c(tmp, value[i]);
+				break;
+			default:
+				last_lwsp = FALSE;
+				str_append_c(tmp, value[i]);
+				break;
+			}
+		}
+	}
+
+	if ( uni_utf8_get_valid_data(str_data(tmp), str_len(tmp), str) )
+		str_append_str(str, tmp);
+
+	if (!literal)
+		str_append_c(str, '"');
+}
+
+char *managesieve_quote(pool_t pool, const unsigned char *value, size_t value_len)
+{
+	string_t *str;
+	char *ret;
+
+	if (value == NULL)
+		return "\"\"";
+
+	T_BEGIN {
+		str = t_str_new(value_len + MAX_INT_STRLEN + 5);
+		managesieve_quote_append(str, value, value_len, TRUE);
+		ret = p_strndup(pool, str_data(str), str_len(str));
+	} T_END;
+
+	return ret;
+}
diff --git a/pigeonhole/src/lib-managesieve/managesieve-quote.h b/pigeonhole/src/lib-managesieve/managesieve-quote.h
new file mode 100644
index 0000000..cae5491
--- /dev/null
+++ b/pigeonhole/src/lib-managesieve/managesieve-quote.h
@@ -0,0 +1,17 @@
+#ifndef IMAP_QUOTE_H
+#define IMAP_QUOTE_H
+
+/* Return value suitable for sending to client, either as quoted-string or
+   literal. Note that this also converts TABs into spaces, multiple spaces
+   into single space and NULs to #128. */
+char *managesieve_quote(pool_t pool, const unsigned char *value, size_t value_len);
+
+/* Append to existing string. */
+void managesieve_quote_append(string_t *str, const unsigned char *value,
+		       size_t value_len, bool compress_lwsp);
+
+#define managesieve_quote_append_string(str, value, compress_lwsp) \
+	managesieve_quote_append(str, (const unsigned char *)(value), \
+			  (size_t)-1, compress_lwsp)
+
+#endif
diff --git a/pigeonhole/src/lib-sieve-tool/Makefile.am b/pigeonhole/src/lib-sieve-tool/Makefile.am
new file mode 100644
index 0000000..3386824
--- /dev/null
+++ b/pigeonhole/src/lib-sieve-tool/Makefile.am
@@ -0,0 +1,13 @@
+noinst_LTLIBRARIES = libsieve-tool.la
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib-sieve \
+	-I$(top_srcdir)/src/lib-sieve/util \
+	$(LIBDOVECOT_INCLUDE) \
+	$(LIBDOVECOT_SERVICE_INCLUDE)
+
+libsieve_tool_la_SOURCES = \
+	sieve-tool.c
+
+noinst_HEADERS = \
+	sieve-tool.h
diff --git a/pigeonhole/src/lib-sieve-tool/Makefile.in b/pigeonhole/src/lib-sieve-tool/Makefile.in
new file mode 100644
index 0000000..c56deeb
--- /dev/null
+++ b/pigeonhole/src/lib-sieve-tool/Makefile.in
@@ -0,0 +1,680 @@
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+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
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+	installcheck installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve-tool/sieve-tool.c b/pigeonhole/src/lib-sieve-tool/sieve-tool.c
new file mode 100644
index 0000000..435f973
--- /dev/null
+++ b/pigeonhole/src/lib-sieve-tool/sieve-tool.c
@@ -0,0 +1,672 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "lib-signals.h"
+#include "array.h"
+#include "ioloop.h"
+#include "ostream.h"
+#include "hostpid.h"
+#include "dict.h"
+#include "mail-namespace.h"
+#include "mail-storage.h"
+#include "mail-user.h"
+#include "message-address.h"
+#include "smtp-params.h"
+#include "master-service.h"
+#include "master-service-settings.h"
+#include "mail-storage-service.h"
+
+#include "sieve.h"
+#include "sieve-plugins.h"
+#include "sieve-extensions.h"
+
+#include "mail-raw.h"
+
+#include "sieve-tool.h"
+
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <pwd.h>
+#include <sysexits.h>
+
+/*
+ * Global state
+ */
+
+struct sieve_tool {
+	char *name;
+
+	bool no_config;
+
+	char *username;
+	char *homedir;
+
+	char *sieve_extensions;
+	ARRAY_TYPE(const_string) sieve_plugins;
+
+	sieve_tool_setting_callback_t setting_callback;
+	void *setting_callback_context;
+
+	struct sieve_instance *svinst;
+
+	struct mail_storage_service_ctx *storage_service;
+	struct mail_storage_service_user *service_user;
+	struct mail_user *mail_user_dovecot;
+	struct mail_user *mail_user;
+
+	struct mail_user *mail_raw_user;
+	struct mail_raw *mail_raw;
+
+	bool debug:1;
+};
+
+struct sieve_tool *sieve_tool;
+
+/*
+ * Settings management
+ */
+
+static const char *
+sieve_tool_sieve_get_setting(void *context, const char *identifier)
+{
+	struct sieve_tool *tool = (struct sieve_tool *) context;
+
+	if (tool->setting_callback != NULL) {
+		return tool->setting_callback(tool->setting_callback_context,
+					      identifier);
+	}
+
+	if (tool->mail_user_dovecot == NULL)
+		return NULL;
+
+	return mail_user_plugin_getenv(tool->mail_user_dovecot, identifier);
+}
+
+static const char *sieve_tool_sieve_get_homedir(void *context)
+{
+	struct sieve_tool *tool = (struct sieve_tool *) context;
+
+	return sieve_tool_get_homedir(tool);
+}
+
+const struct sieve_callbacks sieve_tool_callbacks = {
+	sieve_tool_sieve_get_homedir,
+	sieve_tool_sieve_get_setting
+};
+
+/*
+ * Initialization
+ */
+
+static void
+sieve_tool_get_user_data(const char **username_r, const char **homedir_r)
+{
+	uid_t process_euid = geteuid();
+	struct passwd *pw;
+	const char *user = NULL, *home = NULL;
+
+	user = getenv("USER");
+	home = getenv("HOME");
+
+	if (user == NULL || *user == '\0' || home == NULL || *home == '\0') {
+		if ((pw = getpwuid(process_euid)) != NULL) {
+			user = pw->pw_name;
+			home = pw->pw_dir;
+		}
+	}
+
+	if (username_r != NULL) {
+		if (user == NULL || *user == '\0') {
+			i_fatal("couldn't lookup our username (uid=%s)",
+				dec2str(process_euid));
+		}
+
+		*username_r = t_strdup(user);
+	}
+
+	if (homedir_r != NULL)
+		*homedir_r = t_strdup(home);
+}
+
+struct sieve_tool *
+sieve_tool_init(const char *name, int *argc, char **argv[],
+		const char *getopt_str, bool no_config)
+{
+	struct sieve_tool *tool;
+	enum master_service_flags service_flags =
+		MASTER_SERVICE_FLAG_STANDALONE |
+		MASTER_SERVICE_FLAG_DONT_SEND_STATS |
+		MASTER_SERVICE_FLAG_NO_INIT_DATASTACK_FRAME |
+		MASTER_SERVICE_FLAG_DISABLE_SSL_SET;
+
+	if (no_config)
+		service_flags |= MASTER_SERVICE_FLAG_NO_CONFIG_SETTINGS;
+
+	master_service = master_service_init(name, service_flags,
+					     argc, argv, getopt_str);
+
+	tool = i_new(struct sieve_tool, 1);
+	tool->name = i_strdup(name);
+	tool->no_config = no_config;
+
+	i_array_init(&tool->sieve_plugins, 16);
+
+	return tool;
+}
+
+int sieve_tool_getopt(struct sieve_tool *tool)
+{
+	int c;
+
+	while ((c = master_getopt(master_service)) > 0) {
+		switch (c) {
+		case 'x':
+			/* extensions */
+			if (tool->sieve_extensions != NULL) {
+				i_fatal_status(
+					EX_USAGE,
+					"duplicate -x option specified, "
+					"but only one allowed.");
+			}
+			tool->sieve_extensions = i_strdup(optarg);
+			break;
+		case 'u':
+			if (tool->username == NULL)
+				tool->username = i_strdup(optarg);
+			break;
+		case 'P':
+			/* Plugin */
+			{
+				const char *plugin;
+
+				plugin = t_strdup(optarg);
+				array_append(&tool->sieve_plugins, &plugin, 1);
+			}
+			break;
+		case 'D':
+			tool->debug = TRUE;
+			break;
+		default:
+			return c;
+		}
+	}
+
+	return c;
+}
+
+static void sieve_tool_load_plugins(struct sieve_tool *tool)
+{
+	unsigned int i, count;
+	const char * const *plugins;
+
+	plugins = array_get(&tool->sieve_plugins, &count);
+	for (i = 0; i < count; i++) {
+		const char *path, *file = strrchr(plugins[i], '/');
+
+		if (file != NULL) {
+			path = t_strdup_until(plugins[i], file);
+			file = file+1;
+		} else {
+			path = NULL;
+			file = plugins[i];
+		}
+
+		sieve_plugins_load(tool->svinst, path, file);
+	}
+}
+
+struct sieve_instance *
+sieve_tool_init_finish(struct sieve_tool *tool, bool init_mailstore,
+		       bool preserve_root)
+{
+	enum mail_storage_service_flags storage_service_flags =
+		MAIL_STORAGE_SERVICE_FLAG_NO_CHDIR |
+		MAIL_STORAGE_SERVICE_FLAG_NO_LOG_INIT |
+		MAIL_STORAGE_SERVICE_FLAG_USE_SYSEXITS;
+	struct mail_storage_service_input service_input;
+	struct sieve_environment svenv;
+	const char *username = tool->username;
+	const char *homedir = tool->homedir;
+	const char *errstr;
+
+	master_service_init_finish(master_service);
+
+	if (username == NULL) {
+		sieve_tool_get_user_data(&username, &homedir);
+
+		username = tool->username = i_strdup(username);
+
+		if (tool->homedir != NULL)
+			i_free(tool->homedir);
+		tool->homedir = i_strdup(homedir);
+
+		if (preserve_root) {
+			storage_service_flags |=
+				MAIL_STORAGE_SERVICE_FLAG_NO_RESTRICT_ACCESS;
+		}
+	} else {
+		storage_service_flags |=
+			MAIL_STORAGE_SERVICE_FLAG_USERDB_LOOKUP;
+	}
+
+	if (!init_mailstore)
+		storage_service_flags |=
+			MAIL_STORAGE_SERVICE_FLAG_NO_NAMESPACES;
+
+	i_zero(&service_input);
+	service_input.module = "mail";
+	service_input.service = tool->name;
+	service_input.username = username;
+
+	tool->storage_service = mail_storage_service_init(
+		master_service, NULL, storage_service_flags);
+	if (mail_storage_service_lookup_next(
+		tool->storage_service, &service_input, &tool->service_user,
+		&tool->mail_user_dovecot, &errstr) <= 0)
+		i_fatal("%s", errstr);
+
+	if (master_service_set(master_service,
+			       "mail_full_filesystem_access=yes") < 0)
+		i_unreached();
+
+	memset((void *)&svenv, 0, sizeof(svenv));
+	svenv.username = username;
+	(void)mail_user_get_home(tool->mail_user_dovecot, &svenv.home_dir);
+	svenv.hostname = my_hostdomain();
+	svenv.base_dir = tool->mail_user_dovecot->set->base_dir;
+	svenv.temp_dir = tool->mail_user_dovecot->set->mail_temp_dir;
+	svenv.location = SIEVE_ENV_LOCATION_MS;
+	svenv.delivery_phase = SIEVE_DELIVERY_PHASE_POST;
+
+	/* Initialize Sieve Engine */
+	if ((tool->svinst = sieve_init(&svenv, &sieve_tool_callbacks,
+				       tool, tool->debug)) == NULL)
+		i_fatal("failed to initialize sieve implementation");
+
+	/* Load Sieve plugins */
+	if (array_count(&tool->sieve_plugins) > 0)
+		sieve_tool_load_plugins(tool);
+
+	/* Set active Sieve extensions */
+	if (tool->sieve_extensions != NULL) {
+		sieve_set_extensions(tool->svinst, tool->sieve_extensions);
+	} else if (tool->no_config) {
+		sieve_set_extensions(tool->svinst, NULL);
+	}
+
+	return tool->svinst;
+}
+
+void sieve_tool_deinit(struct sieve_tool **_tool)
+{
+	struct sieve_tool *tool = *_tool;
+
+	*_tool = NULL;
+
+	/* Deinitialize Sieve engine */
+	sieve_deinit(&tool->svinst);
+
+	/* Free options */
+
+	if (tool->username != NULL)
+		i_free(tool->username);
+	if (tool->homedir != NULL)
+		i_free(tool->homedir);
+
+	if (tool->sieve_extensions != NULL)
+		i_free(tool->sieve_extensions);
+	array_free(&tool->sieve_plugins);
+
+	/* Free raw mail */
+
+	if (tool->mail_raw != NULL)
+		mail_raw_close(&tool->mail_raw);
+
+	if (tool->mail_raw_user != NULL)
+		mail_user_unref(&tool->mail_raw_user);
+
+	/* Free mail service */
+
+	if (tool->mail_user != NULL)
+		mail_user_unref(&tool->mail_user);
+	if (tool->mail_user_dovecot != NULL)
+		mail_user_unref(&tool->mail_user_dovecot);
+
+	mail_storage_service_user_unref(&tool->service_user);
+	mail_storage_service_deinit(&tool->storage_service);
+
+	/* Free sieve tool object */
+
+	i_free(tool->name);
+	i_free(tool);
+
+	/* Deinitialize service */
+	master_service_deinit(&master_service);
+}
+
+/*
+ * Mail environment
+ */
+
+void sieve_tool_init_mail_user(struct sieve_tool *tool,
+			       const char *mail_location)
+{
+	struct mail_user *mail_user_dovecot = tool->mail_user_dovecot;
+	const char *username = tool->username;
+	struct mail_namespace *ns = NULL;
+	const char *home = NULL, *errstr = NULL;
+
+	tool->mail_user = mail_user_alloc(NULL, username,
+					  mail_user_dovecot->set_info,
+					  mail_user_dovecot->unexpanded_set);
+
+	if ((home = sieve_tool_get_homedir(sieve_tool)) != NULL)
+		mail_user_set_home(tool->mail_user, home);
+
+	if (mail_user_init(tool->mail_user, &errstr) < 0)
+ 		i_fatal("Test user initialization failed: %s", errstr);
+
+	if (mail_namespaces_init_location(tool->mail_user, mail_location,
+					  &errstr) < 0)
+		i_fatal("Test storage creation failed: %s", errstr);
+
+	ns = tool->mail_user->namespaces;
+	ns->flags |= NAMESPACE_FLAG_NOQUOTA | NAMESPACE_FLAG_NOACL;
+}
+
+static void sieve_tool_init_mail_raw_user(struct sieve_tool *tool)
+{
+	if (tool->mail_raw_user == NULL) {
+		tool->mail_raw_user = mail_raw_user_create(
+			master_service, tool->mail_user_dovecot);
+	}
+}
+
+struct mail *
+sieve_tool_open_file_as_mail(struct sieve_tool *tool, const char *path)
+{
+	sieve_tool_init_mail_raw_user(tool);
+
+	if (tool->mail_raw != NULL)
+		mail_raw_close(&tool->mail_raw);
+
+	tool->mail_raw = mail_raw_open_file(tool->mail_raw_user, path);
+
+	return tool->mail_raw->mail;
+}
+
+struct mail *
+sieve_tool_open_data_as_mail(struct sieve_tool *tool, string_t *mail_data)
+{
+	sieve_tool_init_mail_raw_user(tool);
+
+	if (tool->mail_raw != NULL)
+		mail_raw_close(&tool->mail_raw);
+
+	tool->mail_raw = mail_raw_open_data(tool->mail_raw_user, mail_data);
+
+	return tool->mail_raw->mail;
+}
+
+/*
+ * Configuration
+ */
+
+void sieve_tool_set_homedir(struct sieve_tool *tool, const char *homedir)
+{
+	if (tool->homedir != NULL) {
+		if (strcmp(homedir, tool->homedir) == 0)
+			return;
+
+		i_free(tool->homedir);
+	}
+
+	tool->homedir = i_strdup(homedir);
+
+	if (tool->mail_user_dovecot != NULL)
+		mail_user_set_home(tool->mail_user_dovecot, tool->homedir);
+	if (tool->mail_user != NULL)
+		mail_user_set_home(tool->mail_user, tool->homedir);
+}
+
+void sieve_tool_set_setting_callback(struct sieve_tool *tool,
+				     sieve_tool_setting_callback_t callback,
+				     void *context)
+{
+	tool->setting_callback = callback;
+	tool->setting_callback_context = context;
+}
+
+/*
+ * Accessors
+ */
+
+const char *sieve_tool_get_username(struct sieve_tool *tool)
+{
+	const char *username;
+
+	if (tool->username == NULL) {
+		sieve_tool_get_user_data(&username, NULL);
+		return username;
+	}
+
+	return tool->username;
+}
+
+const char *sieve_tool_get_homedir(struct sieve_tool *tool)
+{
+	const char *homedir = NULL;
+
+	if (tool->homedir != NULL)
+		return tool->homedir;
+
+	if (tool->mail_user_dovecot != NULL &&
+	    mail_user_get_home(tool->mail_user_dovecot, &homedir) > 0)
+		return tool->homedir;
+
+	sieve_tool_get_user_data(NULL, &homedir);
+	return homedir;
+}
+
+struct mail_user *sieve_tool_get_mail_user(struct sieve_tool *tool)
+{
+	return (tool->mail_user == NULL ?
+		tool->mail_user_dovecot : tool->mail_user);
+}
+
+struct mail_user *sieve_tool_get_mail_raw_user(struct sieve_tool *tool)
+{
+	sieve_tool_init_mail_raw_user(tool);
+	return tool->mail_raw_user;
+}
+
+/*
+ * Commonly needed functionality
+ */
+
+static const struct smtp_address *
+sieve_tool_get_address(struct mail *mail, const char *header)
+{
+	struct message_address *addr;
+	struct smtp_address *smtp_addr;
+	const char *str;
+
+	if (mail_get_first_header(mail, header, &str) <= 0)
+		return NULL;
+	addr = message_address_parse(pool_datastack_create(),
+				     (const unsigned char *)str,
+				     strlen(str), 1, 0);
+	if (addr == NULL || addr->mailbox == NULL ||
+	    addr->domain == NULL || *addr->mailbox == '\0' ||
+	    *addr->domain == '\0')
+		return NULL;
+	if (smtp_address_create_from_msg_temp(addr, &smtp_addr) < 0)
+		return NULL;
+	return smtp_addr;
+}
+
+void sieve_tool_get_envelope_data(struct sieve_message_data *msgdata,
+				  struct mail *mail,
+				  const struct smtp_address *sender,
+				  const struct smtp_address *rcpt_orig,
+				  const struct smtp_address *rcpt_final)
+{
+	struct smtp_params_rcpt *rcpt_params;
+
+	/* Get sender address */
+	if (sender == NULL)
+		sender = sieve_tool_get_address(mail, "Return-path");
+	if (sender == NULL)
+		sender = sieve_tool_get_address(mail, "Sender");
+	if (sender == NULL)
+		sender = sieve_tool_get_address(mail, "From");
+	if (sender == NULL)
+		sender = smtp_address_create_temp("sender", "example.com");
+
+	/* Get recipient address */
+	if (rcpt_final == NULL)
+		rcpt_final = sieve_tool_get_address(mail, "Envelope-To");
+	if (rcpt_final == NULL)
+		rcpt_final = sieve_tool_get_address(mail, "To");
+	if (rcpt_final == NULL) {
+		rcpt_final = smtp_address_create_temp("recipient",
+						      "example.com");
+	}
+	if (rcpt_orig == NULL)
+		rcpt_orig = rcpt_final;
+
+	msgdata->envelope.mail_from = sender;
+	msgdata->envelope.rcpt_to = rcpt_final;
+
+	rcpt_params = t_new(struct smtp_params_rcpt, 1);
+	rcpt_params->orcpt.addr = rcpt_orig;
+
+	msgdata->envelope.rcpt_params = rcpt_params;
+}
+
+/*
+ * File I/O
+ */
+
+struct ostream *sieve_tool_open_output_stream(const char *filename)
+{
+	struct ostream *outstream;
+	int fd;
+
+	if (strcmp(filename, "-") == 0)
+		outstream = o_stream_create_fd(1, 0);
+	else {
+		if ((fd = open(filename, O_WRONLY | O_TRUNC | O_CREAT,
+			       0600)) < 0)
+			i_fatal("failed to open file for writing: %m");
+
+		outstream = o_stream_create_fd_autoclose(&fd, 0);
+	}
+
+	return outstream;
+}
+
+/*
+ * Sieve script handling
+ */
+
+struct sieve_binary *
+sieve_tool_script_compile(struct sieve_instance *svinst,
+			  const char *filename, const char *name)
+{
+	struct sieve_error_handler *ehandler;
+	struct sieve_binary *sbin;
+
+	ehandler = sieve_stderr_ehandler_create(svinst, 0);
+	sieve_error_handler_accept_infolog(ehandler, TRUE);
+	sieve_error_handler_accept_debuglog(ehandler, svinst->debug);
+
+	if ((sbin = sieve_compile(svinst, filename, name, ehandler,
+				  0, NULL)) == NULL)
+		i_fatal("failed to compile sieve script '%s'", filename);
+
+	sieve_error_handler_unref(&ehandler);
+	return sbin;
+}
+
+struct sieve_binary *
+sieve_tool_script_open(struct sieve_instance *svinst, const char *filename)
+{
+	struct sieve_error_handler *ehandler;
+	struct sieve_binary *sbin;
+
+	ehandler = sieve_stderr_ehandler_create(svinst, 0);
+	sieve_error_handler_accept_infolog(ehandler, TRUE);
+	sieve_error_handler_accept_debuglog(ehandler, svinst->debug);
+
+	if ((sbin = sieve_open(svinst, filename, NULL, ehandler,
+			       0, NULL)) == NULL) {
+		sieve_error_handler_unref(&ehandler);
+		i_fatal("failed to compile sieve script");
+	}
+
+	sieve_error_handler_unref(&ehandler);
+
+	sieve_save(sbin, FALSE, NULL);
+	return sbin;
+}
+
+void sieve_tool_dump_binary_to(struct sieve_binary *sbin,
+			       const char *filename, bool hexdump)
+{
+	struct ostream *dumpstream;
+
+	if (filename == NULL)
+		return;
+
+	dumpstream = sieve_tool_open_output_stream(filename);
+	if (dumpstream != NULL) {
+		if (hexdump)
+			(void)sieve_hexdump(sbin, dumpstream);
+		else
+			(void)sieve_dump(sbin, dumpstream, FALSE);
+		if (o_stream_finish(dumpstream) < 0) {
+			i_fatal("write(%s) failed: %s", filename,
+				o_stream_get_error(dumpstream));
+		}
+		o_stream_destroy(&dumpstream);
+	} else {
+		i_fatal("Failed to create stream for sieve code dump.");
+	}
+}
+
+/*
+ * Commandline option parsing
+ */
+
+void sieve_tool_parse_trace_option(struct sieve_trace_config *tr_config,
+				   const char *tr_option)
+{
+	if (str_begins(tr_option, "level=")) {
+		const char *lvl = &tr_option[6];
+
+		if (strcmp(lvl, "none") == 0) {
+			tr_config->level = SIEVE_TRLVL_NONE;
+		} else if (strcmp(lvl, "actions") == 0) {
+			tr_config->level = SIEVE_TRLVL_ACTIONS;
+		} else if (strcmp(lvl, "commands") == 0) {
+			tr_config->level = SIEVE_TRLVL_COMMANDS;
+		} else if (strcmp(lvl, "tests") == 0) {
+			tr_config->level = SIEVE_TRLVL_TESTS;
+		} else if (strcmp(lvl, "matching") == 0) {
+			tr_config->level = SIEVE_TRLVL_MATCHING;
+		} else {
+			i_fatal_status(EX_USAGE,
+				       "Unknown -tlevel= trace level: %s", lvl);
+		}
+	} else if (strcmp(tr_option, "debug") == 0) {
+		tr_config->flags |= SIEVE_TRFLG_DEBUG;
+	} else if (strcmp(tr_option, "addresses") == 0) {
+		tr_config->flags |= SIEVE_TRFLG_ADDRESSES;
+	} else {
+		i_fatal_status(EX_USAGE, "Unknown -t trace option value: %s",
+			       tr_option);
+	}
+}
diff --git a/pigeonhole/src/lib-sieve-tool/sieve-tool.h b/pigeonhole/src/lib-sieve-tool/sieve-tool.h
new file mode 100644
index 0000000..02f4198
--- /dev/null
+++ b/pigeonhole/src/lib-sieve-tool/sieve-tool.h
@@ -0,0 +1,100 @@
+#ifndef SIEVE_TOOL_H
+#define SIEVE_TOOL_H
+
+#include "sieve-common.h"
+
+/*
+ * Types
+ */
+
+typedef const char *
+(*sieve_tool_setting_callback_t)(void *context, const char *identifier);
+
+/*
+ * Global variables
+ */
+
+extern struct sieve_tool *sieve_tool;
+
+/*
+ * Initialization
+ */
+
+struct sieve_tool *
+sieve_tool_init(const char *name, int *argc, char **argv[],
+		const char *getopt_str, bool no_config);
+
+int sieve_tool_getopt(struct sieve_tool *tool);
+
+struct sieve_instance *
+sieve_tool_init_finish(struct sieve_tool *tool, bool init_mailstore,
+		       bool preserve_root);
+
+void sieve_tool_deinit(struct sieve_tool **_tool);
+
+/*
+ * Mail environment
+ */
+
+void sieve_tool_init_mail_user(struct sieve_tool *tool,
+			       const char *mail_location);
+
+struct mail *
+sieve_tool_open_file_as_mail(struct sieve_tool *tool, const char *path);
+struct mail *
+sieve_tool_open_data_as_mail(struct sieve_tool *tool, string_t *mail_data);
+
+/*
+ * Accessors
+ */
+
+const char *sieve_tool_get_username(struct sieve_tool *tool);
+const char *sieve_tool_get_homedir(struct sieve_tool *tool);
+struct mail_user *sieve_tool_get_mail_user(struct sieve_tool *tool);
+struct mail_user *sieve_tool_get_mail_raw_user(struct sieve_tool *tool);
+
+/*
+ * Configuration
+ */
+
+void sieve_tool_set_homedir(struct sieve_tool *tool, const char *homedir);
+void sieve_tool_set_setting_callback(struct sieve_tool *tool,
+				     sieve_tool_setting_callback_t callback,
+				     void *context);
+
+/*
+ * Commonly needed functionality
+ */
+
+void sieve_tool_get_envelope_data(struct sieve_message_data *msgdata,
+				  struct mail *mail,
+				  const struct smtp_address *sender,
+				  const struct smtp_address *rcpt_orig,
+				  const struct smtp_address *rcpt_final);
+
+/*
+ * File I/O
+ */
+
+struct ostream *sieve_tool_open_output_stream(const char *filename);
+
+/*
+ * Sieve script handling
+ */
+
+struct sieve_binary *
+sieve_tool_script_compile(struct sieve_instance *svinst,
+			  const char *filename, const char *name);
+struct sieve_binary *
+sieve_tool_script_open(struct sieve_instance *svinst, const char *filename);
+void sieve_tool_dump_binary_to(struct sieve_binary *sbin,
+			       const char *filename, bool hexdump);
+
+/*
+ * Command line option parsing
+ */
+
+void sieve_tool_parse_trace_option(struct sieve_trace_config *tr_config,
+				   const char *tr_option);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/Makefile.am b/pigeonhole/src/lib-sieve/Makefile.am
new file mode 100644
index 0000000..2e80871
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/Makefile.am
@@ -0,0 +1,188 @@
+SUBDIRS = util storage plugins
+
+dovecot_pkglib_LTLIBRARIES = libdovecot-sieve.la
+
+AM_CPPFLAGS = \
+	$(LIBDOVECOT_INCLUDE) \
+	$(LIBDOVECOT_SERVICE_INCLUDE) \
+	-I$(top_srcdir)/src/lib-sieve/util \
+	-DMODULEDIR=\""$(dovecot_moduledir)"\"
+
+tests = \
+	tst-truefalse.c \
+	tst-not.c \
+	tst-anyof.c \
+	tst-allof.c \
+	tst-address.c \
+	tst-header.c \
+	tst-exists.c \
+	tst-size.c
+
+commands = \
+	cmd-require.c \
+	cmd-stop.c \
+	cmd-if.c \
+	cmd-keep.c \
+	cmd-redirect.c \
+	cmd-discard.c
+
+extensions = \
+	ext-fileinto.c \
+	ext-reject.c \
+	ext-envelope.c \
+	ext-encoded-character.c
+
+match_types = \
+	mcht-is.c \
+	mcht-contains.c \
+	mcht-matches.c
+
+comparators = \
+	cmp-i-octet.c \
+	cmp-i-ascii-casemap.c
+
+if BUILD_UNFINISHED
+unfinished_storages =
+unfinished_plugins =
+endif
+
+strgdir = $(top_builddir)/src/lib-sieve/storage
+storages = \
+	$(strgdir)/data/libsieve_storage_data.la \
+	$(strgdir)/file/libsieve_storage_file.la \
+	$(strgdir)/dict/libsieve_storage_dict.la \
+	$(strgdir)/ldap/libsieve_storage_ldap.la \
+	$(unfinished_storages)
+
+extdir = $(top_builddir)/src/lib-sieve/plugins
+plugins = \
+	$(extdir)/vacation/libsieve_ext_vacation.la \
+	$(extdir)/subaddress/libsieve_ext_subaddress.la \
+ 	$(extdir)/comparator-i-ascii-numeric/libsieve_ext_comparator-i-ascii-numeric.la \
+	$(extdir)/relational/libsieve_ext_relational.la \
+	$(extdir)/regex/libsieve_ext_regex.la \
+	$(extdir)/copy/libsieve_ext_copy.la \
+	$(extdir)/imap4flags/libsieve_ext_imap4flags.la \
+	$(extdir)/include/libsieve_ext_include.la \
+	$(extdir)/body/libsieve_ext_body.la \
+	$(extdir)/variables/libsieve_ext_variables.la \
+	$(extdir)/enotify/libsieve_ext_enotify.la \
+	$(extdir)/notify/libsieve_ext_notify.la \
+	$(extdir)/environment/libsieve_ext_environment.la \
+	$(extdir)/mailbox/libsieve_ext_mailbox.la \
+	$(extdir)/date/libsieve_ext_date.la \
+	$(extdir)/spamvirustest/libsieve_ext_spamvirustest.la \
+	$(extdir)/ihave/libsieve_ext_ihave.la \
+	$(extdir)/editheader/libsieve_ext_editheader.la \
+	$(extdir)/duplicate/libsieve_ext_duplicate.la \
+	$(extdir)/index/libsieve_ext_index.la \
+	$(extdir)/metadata/libsieve_ext_metadata.la \
+	$(extdir)/mime/libsieve_ext_mime.la \
+	$(extdir)/special-use/libsieve_ext_special_use.la \
+	$(extdir)/vnd.dovecot/debug/libsieve_ext_debug.la \
+	$(extdir)/vnd.dovecot/environment/libsieve_ext_vnd_environment.la \
+	$(extdir)/vnd.dovecot/report/libsieve_ext_vnd_report.la \
+	$(unfinished_plugins)
+
+libdovecot_sieve_la_DEPENDENCIES = \
+	$(storages) \
+	$(plugins) \
+	$(top_builddir)/src/lib-sieve/util/libsieve_util.la \
+	$(LIBDOVECOT_STORAGE_DEPS) \
+	$(LIBDOVECOT_DEPS)
+libdovecot_sieve_la_LIBADD = \
+	$(storages) \
+	$(plugins) \
+	$(top_builddir)/src/lib-sieve/util/libsieve_util.la \
+	$(LIBDOVECOT_STORAGE) \
+	$(LIBDOVECOT)
+
+libdovecot_sieve_la_SOURCES = \
+	sieve-settings.c \
+	sieve-message.c \
+	sieve-smtp.c \
+	sieve-lexer.c \
+	sieve-script.c \
+	sieve-storage.c \
+	sieve-storage-sync.c \
+	sieve-ast.c \
+	sieve-binary.c \
+	sieve-binary-file.c \
+	sieve-binary-code.c \
+	sieve-binary-debug.c \
+	sieve-parser.c \
+	sieve-address.c \
+	sieve-validator.c \
+	sieve-generator.c \
+	sieve-execute.c \
+	sieve-interpreter.c \
+	sieve-runtime-trace.c \
+	sieve-code-dumper.c \
+	sieve-binary-dumper.c \
+	sieve-result.c \
+	sieve-error.c \
+	sieve-objects.c \
+	sieve-stringlist.c \
+	sieve-comparators.c \
+	sieve-match-types.c \
+	sieve-address-parts.c \
+	sieve-address-source.c \
+	sieve-match.c \
+	sieve-commands.c \
+	sieve-code.c \
+	sieve-actions.c \
+	sieve-extensions.c \
+	sieve-plugins.c \
+	$(comparators) \
+	$(match_types) \
+	$(tests) \
+	$(commands) \
+	$(extensions) \
+	sieve.c
+
+headers = \
+	sieve-config.h \
+	sieve-types.h \
+	sieve-common.h \
+	sieve-limits.h \
+	sieve-settings.h \
+	sieve-message.h \
+	sieve-smtp.h \
+	sieve-lexer.h \
+	sieve-script.h \
+	sieve-script-private.h \
+	sieve-storage.h \
+	sieve-storage-private.h \
+	sieve-ast.h \
+	sieve-binary.h \
+	sieve-binary-private.h \
+	sieve-parser.h \
+	sieve-address.h \
+	sieve-validator.h \
+	sieve-generator.h \
+	sieve-execute.h \
+	sieve-interpreter.h \
+	sieve-runtime-trace.h \
+	sieve-runtime.h \
+	sieve-code-dumper.h \
+	sieve-binary-dumper.h \
+	sieve-dump.h \
+	sieve-result.h \
+	sieve-error.h \
+	sieve-error-private.h \
+	sieve-objects.h \
+	sieve-stringlist.h \
+	sieve-match.h \
+	sieve-comparators.h \
+	sieve-match-types.h \
+	sieve-address-parts.h \
+	sieve-address-source.h \
+	sieve-commands.h \
+	sieve-code.h \
+	sieve-actions.h \
+	sieve-extensions.h \
+	sieve-plugins.h \
+	sieve.h
+
+pkginc_libdir=$(dovecot_pkgincludedir)/sieve
+pkginc_lib_HEADERS = $(headers)
diff --git a/pigeonhole/src/lib-sieve/Makefile.in b/pigeonhole/src/lib-sieve/Makefile.in
new file mode 100644
index 0000000..104d4df
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/Makefile.in
@@ -0,0 +1,1311 @@
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+
+# This Makefile.in is free software; the Free Software Foundation
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+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
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+         $(am__cd) "$$dir" && rm -f $$files; }; \
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+am__DEPENDENCIES_1 =
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+am__objects_3 = tst-truefalse.lo tst-not.lo tst-anyof.lo tst-allof.lo \
+	tst-address.lo tst-header.lo tst-exists.lo tst-size.lo
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+	ext-encoded-character.lo
+am_libdovecot_sieve_la_OBJECTS = sieve-settings.lo sieve-message.lo \
+	sieve-smtp.lo sieve-lexer.lo sieve-script.lo sieve-storage.lo \
+	sieve-storage-sync.lo sieve-ast.lo sieve-binary.lo \
+	sieve-binary-file.lo sieve-binary-code.lo \
+	sieve-binary-debug.lo sieve-parser.lo sieve-address.lo \
+	sieve-validator.lo sieve-generator.lo sieve-execute.lo \
+	sieve-interpreter.lo sieve-runtime-trace.lo \
+	sieve-code-dumper.lo sieve-binary-dumper.lo sieve-result.lo \
+	sieve-error.lo sieve-objects.lo sieve-stringlist.lo \
+	sieve-comparators.lo sieve-match-types.lo \
+	sieve-address-parts.lo sieve-address-source.lo sieve-match.lo \
+	sieve-commands.lo sieve-code.lo sieve-actions.lo \
+	sieve-extensions.lo sieve-plugins.lo $(am__objects_1) \
+	$(am__objects_2) $(am__objects_3) $(am__objects_4) \
+	$(am__objects_5) sieve.lo
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+	./$(DEPDIR)/cmd-redirect.Plo ./$(DEPDIR)/cmd-require.Plo \
+	./$(DEPDIR)/cmd-stop.Plo ./$(DEPDIR)/cmp-i-ascii-casemap.Plo \
+	./$(DEPDIR)/cmp-i-octet.Plo \
+	./$(DEPDIR)/ext-encoded-character.Plo \
+	./$(DEPDIR)/ext-envelope.Plo ./$(DEPDIR)/ext-fileinto.Plo \
+	./$(DEPDIR)/ext-reject.Plo ./$(DEPDIR)/mcht-contains.Plo \
+	./$(DEPDIR)/mcht-is.Plo ./$(DEPDIR)/mcht-matches.Plo \
+	./$(DEPDIR)/sieve-actions.Plo \
+	./$(DEPDIR)/sieve-address-parts.Plo \
+	./$(DEPDIR)/sieve-address-source.Plo \
+	./$(DEPDIR)/sieve-address.Plo ./$(DEPDIR)/sieve-ast.Plo \
+	./$(DEPDIR)/sieve-binary-code.Plo \
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+	./$(DEPDIR)/sieve-commands.Plo \
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+	./$(DEPDIR)/sieve-execute.Plo ./$(DEPDIR)/sieve-extensions.Plo \
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+	./$(DEPDIR)/sieve-message.Plo ./$(DEPDIR)/sieve-objects.Plo \
+	./$(DEPDIR)/sieve-parser.Plo ./$(DEPDIR)/sieve-plugins.Plo \
+	./$(DEPDIR)/sieve-result.Plo \
+	./$(DEPDIR)/sieve-runtime-trace.Plo \
+	./$(DEPDIR)/sieve-script.Plo ./$(DEPDIR)/sieve-settings.Plo \
+	./$(DEPDIR)/sieve-smtp.Plo ./$(DEPDIR)/sieve-storage-sync.Plo \
+	./$(DEPDIR)/sieve-storage.Plo ./$(DEPDIR)/sieve-stringlist.Plo \
+	./$(DEPDIR)/sieve-validator.Plo ./$(DEPDIR)/sieve.Plo \
+	./$(DEPDIR)/tst-address.Plo ./$(DEPDIR)/tst-allof.Plo \
+	./$(DEPDIR)/tst-anyof.Plo ./$(DEPDIR)/tst-exists.Plo \
+	./$(DEPDIR)/tst-header.Plo ./$(DEPDIR)/tst-not.Plo \
+	./$(DEPDIR)/tst-size.Plo ./$(DEPDIR)/tst-truefalse.Plo
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+top_srcdir = @top_srcdir@
+SUBDIRS = util storage plugins
+dovecot_pkglib_LTLIBRARIES = libdovecot-sieve.la
+AM_CPPFLAGS = \
+	$(LIBDOVECOT_INCLUDE) \
+	$(LIBDOVECOT_SERVICE_INCLUDE) \
+	-I$(top_srcdir)/src/lib-sieve/util \
+	-DMODULEDIR=\""$(dovecot_moduledir)"\"
+
+tests = \
+	tst-truefalse.c \
+	tst-not.c \
+	tst-anyof.c \
+	tst-allof.c \
+	tst-address.c \
+	tst-header.c \
+	tst-exists.c \
+	tst-size.c
+
+commands = \
+	cmd-require.c \
+	cmd-stop.c \
+	cmd-if.c \
+	cmd-keep.c \
+	cmd-redirect.c \
+	cmd-discard.c
+
+extensions = \
+	ext-fileinto.c \
+	ext-reject.c \
+	ext-envelope.c \
+	ext-encoded-character.c
+
+match_types = \
+	mcht-is.c \
+	mcht-contains.c \
+	mcht-matches.c
+
+comparators = \
+	cmp-i-octet.c \
+	cmp-i-ascii-casemap.c
+
+@BUILD_UNFINISHED_TRUE@unfinished_storages = 
+@BUILD_UNFINISHED_TRUE@unfinished_plugins = 
+strgdir = $(top_builddir)/src/lib-sieve/storage
+storages = \
+	$(strgdir)/data/libsieve_storage_data.la \
+	$(strgdir)/file/libsieve_storage_file.la \
+	$(strgdir)/dict/libsieve_storage_dict.la \
+	$(strgdir)/ldap/libsieve_storage_ldap.la \
+	$(unfinished_storages)
+
+extdir = $(top_builddir)/src/lib-sieve/plugins
+plugins = \
+	$(extdir)/vacation/libsieve_ext_vacation.la \
+	$(extdir)/subaddress/libsieve_ext_subaddress.la \
+ 	$(extdir)/comparator-i-ascii-numeric/libsieve_ext_comparator-i-ascii-numeric.la \
+	$(extdir)/relational/libsieve_ext_relational.la \
+	$(extdir)/regex/libsieve_ext_regex.la \
+	$(extdir)/copy/libsieve_ext_copy.la \
+	$(extdir)/imap4flags/libsieve_ext_imap4flags.la \
+	$(extdir)/include/libsieve_ext_include.la \
+	$(extdir)/body/libsieve_ext_body.la \
+	$(extdir)/variables/libsieve_ext_variables.la \
+	$(extdir)/enotify/libsieve_ext_enotify.la \
+	$(extdir)/notify/libsieve_ext_notify.la \
+	$(extdir)/environment/libsieve_ext_environment.la \
+	$(extdir)/mailbox/libsieve_ext_mailbox.la \
+	$(extdir)/date/libsieve_ext_date.la \
+	$(extdir)/spamvirustest/libsieve_ext_spamvirustest.la \
+	$(extdir)/ihave/libsieve_ext_ihave.la \
+	$(extdir)/editheader/libsieve_ext_editheader.la \
+	$(extdir)/duplicate/libsieve_ext_duplicate.la \
+	$(extdir)/index/libsieve_ext_index.la \
+	$(extdir)/metadata/libsieve_ext_metadata.la \
+	$(extdir)/mime/libsieve_ext_mime.la \
+	$(extdir)/special-use/libsieve_ext_special_use.la \
+	$(extdir)/vnd.dovecot/debug/libsieve_ext_debug.la \
+	$(extdir)/vnd.dovecot/environment/libsieve_ext_vnd_environment.la \
+	$(extdir)/vnd.dovecot/report/libsieve_ext_vnd_report.la \
+	$(unfinished_plugins)
+
+libdovecot_sieve_la_DEPENDENCIES = \
+	$(storages) \
+	$(plugins) \
+	$(top_builddir)/src/lib-sieve/util/libsieve_util.la \
+	$(LIBDOVECOT_STORAGE_DEPS) \
+	$(LIBDOVECOT_DEPS)
+
+libdovecot_sieve_la_LIBADD = \
+	$(storages) \
+	$(plugins) \
+	$(top_builddir)/src/lib-sieve/util/libsieve_util.la \
+	$(LIBDOVECOT_STORAGE) \
+	$(LIBDOVECOT)
+
+libdovecot_sieve_la_SOURCES = \
+	sieve-settings.c \
+	sieve-message.c \
+	sieve-smtp.c \
+	sieve-lexer.c \
+	sieve-script.c \
+	sieve-storage.c \
+	sieve-storage-sync.c \
+	sieve-ast.c \
+	sieve-binary.c \
+	sieve-binary-file.c \
+	sieve-binary-code.c \
+	sieve-binary-debug.c \
+	sieve-parser.c \
+	sieve-address.c \
+	sieve-validator.c \
+	sieve-generator.c \
+	sieve-execute.c \
+	sieve-interpreter.c \
+	sieve-runtime-trace.c \
+	sieve-code-dumper.c \
+	sieve-binary-dumper.c \
+	sieve-result.c \
+	sieve-error.c \
+	sieve-objects.c \
+	sieve-stringlist.c \
+	sieve-comparators.c \
+	sieve-match-types.c \
+	sieve-address-parts.c \
+	sieve-address-source.c \
+	sieve-match.c \
+	sieve-commands.c \
+	sieve-code.c \
+	sieve-actions.c \
+	sieve-extensions.c \
+	sieve-plugins.c \
+	$(comparators) \
+	$(match_types) \
+	$(tests) \
+	$(commands) \
+	$(extensions) \
+	sieve.c
+
+headers = \
+	sieve-config.h \
+	sieve-types.h \
+	sieve-common.h \
+	sieve-limits.h \
+	sieve-settings.h \
+	sieve-message.h \
+	sieve-smtp.h \
+	sieve-lexer.h \
+	sieve-script.h \
+	sieve-script-private.h \
+	sieve-storage.h \
+	sieve-storage-private.h \
+	sieve-ast.h \
+	sieve-binary.h \
+	sieve-binary-private.h \
+	sieve-parser.h \
+	sieve-address.h \
+	sieve-validator.h \
+	sieve-generator.h \
+	sieve-execute.h \
+	sieve-interpreter.h \
+	sieve-runtime-trace.h \
+	sieve-runtime.h \
+	sieve-code-dumper.h \
+	sieve-binary-dumper.h \
+	sieve-dump.h \
+	sieve-result.h \
+	sieve-error.h \
+	sieve-error-private.h \
+	sieve-objects.h \
+	sieve-stringlist.h \
+	sieve-match.h \
+	sieve-comparators.h \
+	sieve-match-types.h \
+	sieve-address-parts.h \
+	sieve-address-source.h \
+	sieve-commands.h \
+	sieve-code.h \
+	sieve-actions.h \
+	sieve-extensions.h \
+	sieve-plugins.h \
+	sieve.h
+
+pkginc_libdir = $(dovecot_pkgincludedir)/sieve
+pkginc_lib_HEADERS = $(headers)
+all: all-recursive
+
+.SUFFIXES:
+.SUFFIXES: .c .lo .o .obj
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/lib-sieve/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/lib-sieve/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4): @MAINTAINER_MODE_TRUE@ $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+
+install-dovecot_pkglibLTLIBRARIES: $(dovecot_pkglib_LTLIBRARIES)
+	@$(NORMAL_INSTALL)
+	@list='$(dovecot_pkglib_LTLIBRARIES)'; test -n "$(dovecot_pkglibdir)" || list=; \
+	list2=; for p in $$list; do \
+	  if test -f $$p; then \
+	    list2="$$list2 $$p"; \
+	  else :; fi; \
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+	-rm -f ./$(DEPDIR)/sieve-code-dumper.Plo
+	-rm -f ./$(DEPDIR)/sieve-code.Plo
+	-rm -f ./$(DEPDIR)/sieve-commands.Plo
+	-rm -f ./$(DEPDIR)/sieve-comparators.Plo
+	-rm -f ./$(DEPDIR)/sieve-error.Plo
+	-rm -f ./$(DEPDIR)/sieve-execute.Plo
+	-rm -f ./$(DEPDIR)/sieve-extensions.Plo
+	-rm -f ./$(DEPDIR)/sieve-generator.Plo
+	-rm -f ./$(DEPDIR)/sieve-interpreter.Plo
+	-rm -f ./$(DEPDIR)/sieve-lexer.Plo
+	-rm -f ./$(DEPDIR)/sieve-match-types.Plo
+	-rm -f ./$(DEPDIR)/sieve-match.Plo
+	-rm -f ./$(DEPDIR)/sieve-message.Plo
+	-rm -f ./$(DEPDIR)/sieve-objects.Plo
+	-rm -f ./$(DEPDIR)/sieve-parser.Plo
+	-rm -f ./$(DEPDIR)/sieve-plugins.Plo
+	-rm -f ./$(DEPDIR)/sieve-result.Plo
+	-rm -f ./$(DEPDIR)/sieve-runtime-trace.Plo
+	-rm -f ./$(DEPDIR)/sieve-script.Plo
+	-rm -f ./$(DEPDIR)/sieve-settings.Plo
+	-rm -f ./$(DEPDIR)/sieve-smtp.Plo
+	-rm -f ./$(DEPDIR)/sieve-storage-sync.Plo
+	-rm -f ./$(DEPDIR)/sieve-storage.Plo
+	-rm -f ./$(DEPDIR)/sieve-stringlist.Plo
+	-rm -f ./$(DEPDIR)/sieve-validator.Plo
+	-rm -f ./$(DEPDIR)/sieve.Plo
+	-rm -f ./$(DEPDIR)/tst-address.Plo
+	-rm -f ./$(DEPDIR)/tst-allof.Plo
+	-rm -f ./$(DEPDIR)/tst-anyof.Plo
+	-rm -f ./$(DEPDIR)/tst-exists.Plo
+	-rm -f ./$(DEPDIR)/tst-header.Plo
+	-rm -f ./$(DEPDIR)/tst-not.Plo
+	-rm -f ./$(DEPDIR)/tst-size.Plo
+	-rm -f ./$(DEPDIR)/tst-truefalse.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-recursive
+
+dvi-am:
+
+html: html-recursive
+
+html-am:
+
+info: info-recursive
+
+info-am:
+
+install-data-am: install-dovecot_pkglibLTLIBRARIES \
+	install-pkginc_libHEADERS
+
+install-dvi: install-dvi-recursive
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-recursive
+
+install-html-am:
+
+install-info: install-info-recursive
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-recursive
+
+install-pdf-am:
+
+install-ps: install-ps-recursive
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-recursive
+		-rm -f ./$(DEPDIR)/cmd-discard.Plo
+	-rm -f ./$(DEPDIR)/cmd-if.Plo
+	-rm -f ./$(DEPDIR)/cmd-keep.Plo
+	-rm -f ./$(DEPDIR)/cmd-redirect.Plo
+	-rm -f ./$(DEPDIR)/cmd-require.Plo
+	-rm -f ./$(DEPDIR)/cmd-stop.Plo
+	-rm -f ./$(DEPDIR)/cmp-i-ascii-casemap.Plo
+	-rm -f ./$(DEPDIR)/cmp-i-octet.Plo
+	-rm -f ./$(DEPDIR)/ext-encoded-character.Plo
+	-rm -f ./$(DEPDIR)/ext-envelope.Plo
+	-rm -f ./$(DEPDIR)/ext-fileinto.Plo
+	-rm -f ./$(DEPDIR)/ext-reject.Plo
+	-rm -f ./$(DEPDIR)/mcht-contains.Plo
+	-rm -f ./$(DEPDIR)/mcht-is.Plo
+	-rm -f ./$(DEPDIR)/mcht-matches.Plo
+	-rm -f ./$(DEPDIR)/sieve-actions.Plo
+	-rm -f ./$(DEPDIR)/sieve-address-parts.Plo
+	-rm -f ./$(DEPDIR)/sieve-address-source.Plo
+	-rm -f ./$(DEPDIR)/sieve-address.Plo
+	-rm -f ./$(DEPDIR)/sieve-ast.Plo
+	-rm -f ./$(DEPDIR)/sieve-binary-code.Plo
+	-rm -f ./$(DEPDIR)/sieve-binary-debug.Plo
+	-rm -f ./$(DEPDIR)/sieve-binary-dumper.Plo
+	-rm -f ./$(DEPDIR)/sieve-binary-file.Plo
+	-rm -f ./$(DEPDIR)/sieve-binary.Plo
+	-rm -f ./$(DEPDIR)/sieve-code-dumper.Plo
+	-rm -f ./$(DEPDIR)/sieve-code.Plo
+	-rm -f ./$(DEPDIR)/sieve-commands.Plo
+	-rm -f ./$(DEPDIR)/sieve-comparators.Plo
+	-rm -f ./$(DEPDIR)/sieve-error.Plo
+	-rm -f ./$(DEPDIR)/sieve-execute.Plo
+	-rm -f ./$(DEPDIR)/sieve-extensions.Plo
+	-rm -f ./$(DEPDIR)/sieve-generator.Plo
+	-rm -f ./$(DEPDIR)/sieve-interpreter.Plo
+	-rm -f ./$(DEPDIR)/sieve-lexer.Plo
+	-rm -f ./$(DEPDIR)/sieve-match-types.Plo
+	-rm -f ./$(DEPDIR)/sieve-match.Plo
+	-rm -f ./$(DEPDIR)/sieve-message.Plo
+	-rm -f ./$(DEPDIR)/sieve-objects.Plo
+	-rm -f ./$(DEPDIR)/sieve-parser.Plo
+	-rm -f ./$(DEPDIR)/sieve-plugins.Plo
+	-rm -f ./$(DEPDIR)/sieve-result.Plo
+	-rm -f ./$(DEPDIR)/sieve-runtime-trace.Plo
+	-rm -f ./$(DEPDIR)/sieve-script.Plo
+	-rm -f ./$(DEPDIR)/sieve-settings.Plo
+	-rm -f ./$(DEPDIR)/sieve-smtp.Plo
+	-rm -f ./$(DEPDIR)/sieve-storage-sync.Plo
+	-rm -f ./$(DEPDIR)/sieve-storage.Plo
+	-rm -f ./$(DEPDIR)/sieve-stringlist.Plo
+	-rm -f ./$(DEPDIR)/sieve-validator.Plo
+	-rm -f ./$(DEPDIR)/sieve.Plo
+	-rm -f ./$(DEPDIR)/tst-address.Plo
+	-rm -f ./$(DEPDIR)/tst-allof.Plo
+	-rm -f ./$(DEPDIR)/tst-anyof.Plo
+	-rm -f ./$(DEPDIR)/tst-exists.Plo
+	-rm -f ./$(DEPDIR)/tst-header.Plo
+	-rm -f ./$(DEPDIR)/tst-not.Plo
+	-rm -f ./$(DEPDIR)/tst-size.Plo
+	-rm -f ./$(DEPDIR)/tst-truefalse.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-recursive
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-recursive
+
+pdf-am:
+
+ps: ps-recursive
+
+ps-am:
+
+uninstall-am: uninstall-dovecot_pkglibLTLIBRARIES \
+	uninstall-pkginc_libHEADERS
+
+.MAKE: $(am__recursive_targets) install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am \
+	am--depfiles check check-am clean \
+	clean-dovecot_pkglibLTLIBRARIES clean-generic clean-libtool \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dovecot_pkglibLTLIBRARIES \
+	install-dvi install-dvi-am install-exec install-exec-am \
+	install-html install-html-am install-info install-info-am \
+	install-man install-pdf install-pdf-am \
+	install-pkginc_libHEADERS install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	installdirs-am maintainer-clean maintainer-clean-generic \
+	mostlyclean mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool pdf pdf-am ps ps-am tags tags-am uninstall \
+	uninstall-am uninstall-dovecot_pkglibLTLIBRARIES \
+	uninstall-pkginc_libHEADERS
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/cmd-discard.c b/pigeonhole/src/lib-sieve/cmd-discard.c
new file mode 100644
index 0000000..de460ae
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/cmd-discard.c
@@ -0,0 +1,173 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-dump.h"
+#include "sieve-actions.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-result.h"
+
+/*
+ * Discard command
+ *
+ * Syntax
+ *   discard
+ */
+
+static bool
+cmd_discard_generate(const struct sieve_codegen_env *cgenv,
+		     struct sieve_command *ctx ATTR_UNUSED);
+
+const struct sieve_command_def cmd_discard = {
+	.identifier = "discard",
+	.type = SCT_COMMAND,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.generate = cmd_discard_generate
+};
+
+/*
+ * Discard operation
+ */
+
+static bool
+cmd_discard_operation_dump(const struct sieve_dumptime_env *denv,
+			   sieve_size_t *address);
+static int
+cmd_discard_operation_execute(const struct sieve_runtime_env *renv,
+			      sieve_size_t *address);
+
+const struct sieve_operation_def cmd_discard_operation = {
+	.mnemonic = "DISCARD",
+	.code = SIEVE_OPERATION_DISCARD,
+	.dump = cmd_discard_operation_dump,
+	.execute = cmd_discard_operation_execute
+};
+
+/*
+ * Discard actions
+ */
+
+static bool
+act_discard_equals(const struct sieve_script_env *senv,
+		   const struct sieve_action *act1,
+		   const struct sieve_action *act2);
+static int
+act_discard_check_duplicate(const struct sieve_runtime_env *renv,
+			    const struct sieve_action *act,
+			    const struct sieve_action *act_other);
+static void
+act_discard_print(const struct sieve_action *action,
+		  const struct sieve_result_print_env *rpenv, bool *keep);
+static int
+act_discard_execute(const struct sieve_action_exec_env *aenv, void *tr_context,
+		    bool *keep);
+
+const struct sieve_action_def act_discard = {
+	.name = "discard",
+	.equals = act_discard_equals,
+	.check_duplicate = act_discard_check_duplicate,
+	.print = act_discard_print,
+	.execute = act_discard_execute,
+};
+
+/*
+ * Code generation
+ */
+
+static bool
+cmd_discard_generate(const struct sieve_codegen_env *cgenv,
+		     struct sieve_command *cmd ATTR_UNUSED)
+{
+	sieve_operation_emit(cgenv->sblock, NULL, &cmd_discard_operation);
+
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+cmd_discard_operation_dump(const struct sieve_dumptime_env *denv,
+			   sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "DISCARD");
+	sieve_code_descend(denv);
+
+	return (sieve_action_opr_optional_dump(denv, address, NULL) == 0);
+}
+
+/*
+ * Interpretation
+ */
+
+static int
+cmd_discard_operation_execute(const struct sieve_runtime_env *renv ATTR_UNUSED,
+			      sieve_size_t *address ATTR_UNUSED)
+{
+	sieve_runtime_trace(renv, SIEVE_TRLVL_ACTIONS,
+		"discard action; cancel implicit keep");
+
+	if (sieve_result_add_action(renv, NULL, "discard", &act_discard,
+				    NULL, NULL, 0, FALSE) < 0)
+		return SIEVE_EXEC_FAILURE;
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Action implementation
+ */
+
+static bool
+act_discard_equals(const struct sieve_script_env *senv ATTR_UNUSED,
+		   const struct sieve_action *act1 ATTR_UNUSED,
+		   const struct sieve_action *act2 ATTR_UNUSED)
+{
+	return TRUE;
+}
+
+static int
+act_discard_check_duplicate(const struct sieve_runtime_env *renv ATTR_UNUSED,
+			    const struct sieve_action *act ATTR_UNUSED,
+			    const struct sieve_action *act_other ATTR_UNUSED)
+{
+	return 1;
+}
+
+static void
+act_discard_print(const struct sieve_action *action ATTR_UNUSED,
+		  const struct sieve_result_print_env *rpenv, bool *keep)
+{
+	sieve_result_action_printf(rpenv, "discard");
+
+	*keep = FALSE;
+}
+
+static int
+act_discard_execute(const struct sieve_action_exec_env *aenv,
+		    void *tr_context ATTR_UNUSED, bool *keep)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+
+	eenv->exec_status->significant_action_executed = TRUE;
+
+	struct event_passthrough *e = sieve_action_create_finish_event(aenv);
+
+	sieve_result_event_log(aenv, e->event(),
+		"Marked message to be discarded if not explicitly delivered "
+		"(discard action)");
+	*keep = FALSE;
+
+	return SIEVE_EXEC_OK;
+}
+
diff --git a/pigeonhole/src/lib-sieve/cmd-if.c b/pigeonhole/src/lib-sieve/cmd-if.c
new file mode 100644
index 0000000..2ae186e
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/cmd-if.c
@@ -0,0 +1,277 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+
+/*
+ * Commands
+ */
+
+static bool cmd_if_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool cmd_elsif_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool cmd_if_validate_const
+	(struct sieve_validator *valdtr, struct sieve_command *cmd,
+		int *const_current, int const_next);
+static bool cmd_if_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd);
+static bool cmd_else_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd);
+
+/* If command
+ *
+ * Syntax:
+ *   if <test1: test> <block1: block>
+ */
+
+const struct sieve_command_def cmd_if = {
+	.identifier = "if",
+	.type = SCT_COMMAND,
+	.positional_args = 0,
+	.subtests = 1,
+	.block_allowed = TRUE,
+	.block_required = TRUE,
+	.validate = cmd_if_validate,
+	.validate_const = cmd_if_validate_const,
+	.generate = cmd_if_generate
+};
+
+/* ElsIf command
+ *
+ * Santax:
+ *   elsif <test2: test> <block2: block>
+ */
+
+const struct sieve_command_def cmd_elsif = {
+	.identifier = "elsif",
+	.type = SCT_COMMAND,
+	.positional_args = 0,
+	.subtests = 1,
+	.block_allowed = TRUE,
+	.block_required = TRUE,
+	.validate = cmd_elsif_validate,
+	.validate_const = cmd_if_validate_const,
+	.generate = cmd_if_generate
+};
+
+/* Else command
+ *
+ * Syntax:
+ *   else <block>
+ */
+
+const struct sieve_command_def cmd_else = {
+	.identifier = "else",
+	.type = SCT_COMMAND,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = TRUE,
+	.block_required = TRUE,
+	.validate = cmd_elsif_validate,
+	.validate_const = cmd_if_validate_const,
+	.generate = cmd_else_generate
+};
+
+/*
+ * Context management
+ */
+
+struct cmd_if_context_data {
+	struct cmd_if_context_data *previous;
+	struct cmd_if_context_data *next;
+
+	int const_condition;
+
+	bool jump_generated;
+	sieve_size_t exit_jump;
+};
+
+static void cmd_if_initialize_context_data
+(struct sieve_command *cmd, struct cmd_if_context_data *previous)
+{
+	struct cmd_if_context_data *cmd_data;
+
+	/* Assign context */
+	cmd_data = p_new(sieve_command_pool(cmd), struct cmd_if_context_data, 1);
+	cmd_data->exit_jump = 0;
+	cmd_data->jump_generated = FALSE;
+
+	/* Update linked list of contexts */
+	cmd_data->previous = previous;
+	cmd_data->next = NULL;
+	if ( previous != NULL )
+		previous->next = cmd_data;
+
+	/* Check const status */
+	cmd_data->const_condition = -1;
+	while ( previous != NULL ) {
+		if ( previous->const_condition > 0 ) {
+			cmd_data->const_condition = 0;
+			break;
+		}
+		previous = previous->previous;
+	}
+
+	/* Assign to command context */
+	cmd->data = cmd_data;
+}
+
+/*
+ * Validation
+ */
+
+static bool cmd_if_validate
+(struct sieve_validator *valdtr ATTR_UNUSED, struct sieve_command *cmd)
+{
+	/* Start if-command structure */
+	cmd_if_initialize_context_data(cmd, NULL);
+
+	return TRUE;
+}
+
+static bool cmd_elsif_validate
+(struct sieve_validator *valdtr, struct sieve_command *cmd)
+{
+	struct sieve_command *prev;
+
+	i_assert(cmd != NULL);
+	prev = sieve_command_prev(cmd);
+
+	/* Check valid command placement */
+	if ( prev == NULL ||
+		( !sieve_command_is(prev, cmd_if) && !sieve_command_is(prev, cmd_elsif) ) )
+	{
+		sieve_command_validate_error(valdtr, cmd,
+			"the %s command must follow an if or elseif command",
+			sieve_command_identifier(cmd));
+		return FALSE;
+	}
+
+	/* Previous command in this block is 'if' or 'elsif', so we can safely refer
+	 * to its context data
+	 */
+	cmd_if_initialize_context_data(cmd, prev->data);
+
+	return TRUE;
+}
+
+static bool cmd_if_validate_const
+(struct sieve_validator *valdtr ATTR_UNUSED, struct sieve_command *cmd,
+	int *const_current, int const_next)
+{
+	struct cmd_if_context_data *cmd_data =
+		(struct cmd_if_context_data *) cmd->data;
+
+	if ( cmd_data != NULL ) {
+		if ( cmd_data->const_condition == 0 ) {
+			*const_current = cmd_data->const_condition;
+			return FALSE;
+		}
+
+		cmd_data->const_condition = const_next;
+	}
+
+	*const_current = const_next;
+
+	return ( const_next < 0 );
+}
+
+/*
+ * Code generation
+ */
+
+/* The if command does not generate specific IF-ELSIF-ELSE opcodes, but only uses
+ * JMP instructions. This is why the implementation of the if command does not
+ * include an opcode implementation.
+ */
+
+static void cmd_if_resolve_exit_jumps
+(struct sieve_binary_block *sblock, struct cmd_if_context_data *cmd_data)
+{
+	struct cmd_if_context_data *if_ctx = cmd_data->previous;
+
+	/* Iterate backwards through all if-command contexts and resolve the
+	 * exit jumps to the current code position.
+	 */
+	while ( if_ctx != NULL ) {
+		if ( if_ctx->jump_generated )
+			sieve_binary_resolve_offset(sblock, if_ctx->exit_jump);
+		if_ctx = if_ctx->previous;
+	}
+}
+
+static bool cmd_if_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	struct sieve_binary_block *sblock = cgenv->sblock;
+	struct cmd_if_context_data *cmd_data =
+		(struct cmd_if_context_data *) cmd->data;
+	struct sieve_ast_node *test;
+	struct sieve_jumplist jmplist;
+
+	/* Generate test condition */
+	if ( cmd_data->const_condition < 0 ) {
+		/* Prepare jumplist */
+		sieve_jumplist_init_temp(&jmplist, sblock);
+
+		test = sieve_ast_test_first(cmd->ast_node);
+		if ( !sieve_generate_test(cgenv, test, &jmplist, FALSE) )
+			return FALSE;
+	}
+
+	/* Case true { */
+	if ( cmd_data->const_condition != 0 ) {
+		if ( !sieve_generate_block(cgenv, cmd->ast_node) )
+			return FALSE;
+	}
+
+	/* Are we the final command in this if-elsif-else structure? */
+	if ( cmd_data->next == NULL || cmd_data->const_condition == 1 ) {
+		/* Yes, Resolve previous exit jumps to this point */
+		cmd_if_resolve_exit_jumps(sblock, cmd_data);
+
+	} else if ( cmd_data->const_condition < 0 ) {
+		/* No, generate jump to end of if-elsif-else structure (resolved later)
+		 * This of course is not necessary if the {} block contains a command
+		 * like stop at top level that unconditionally exits the block already
+		 * anyway.
+		 */
+		if ( !sieve_command_block_exits_unconditionally(cmd) ) {
+			sieve_operation_emit(sblock, NULL, &sieve_jmp_operation);
+			cmd_data->exit_jump = sieve_binary_emit_offset(sblock, 0);
+			cmd_data->jump_generated = TRUE;
+		}
+	}
+
+	if ( cmd_data->const_condition < 0 ) {
+		/* Case false ... (subsequent elsif/else commands might generate more) */
+		sieve_jumplist_resolve(&jmplist);
+	}
+
+	return TRUE;
+}
+
+static bool cmd_else_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	struct cmd_if_context_data *cmd_data =
+		(struct cmd_if_context_data *) cmd->data;
+
+	/* Else { */
+	if ( cmd_data->const_condition != 0 ) {
+		if ( !sieve_generate_block(cgenv, cmd->ast_node) )
+			return FALSE;
+
+		/* } End: resolve all exit blocks */
+		cmd_if_resolve_exit_jumps(cgenv->sblock, cmd_data);
+	}
+
+	return TRUE;
+}
+
diff --git a/pigeonhole/src/lib-sieve/cmd-keep.c b/pigeonhole/src/lib-sieve/cmd-keep.c
new file mode 100644
index 0000000..b619a80
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/cmd-keep.c
@@ -0,0 +1,113 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-dump.h"
+#include "sieve-message.h"
+#include "sieve-actions.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-result.h"
+
+/*
+ * Keep command
+ *
+ * Syntax:
+ *   keep
+ */
+
+static bool cmd_keep_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd);
+
+const struct sieve_command_def cmd_keep = {
+	.identifier = "keep",
+	.type = SCT_COMMAND,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.generate = cmd_keep_generate
+};
+
+/*
+ * Keep operation
+ */
+
+static bool cmd_keep_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int cmd_keep_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def cmd_keep_operation = {
+	.mnemonic = "KEEP",
+	.code = SIEVE_OPERATION_KEEP,
+	.dump = cmd_keep_operation_dump,
+	.execute = cmd_keep_operation_execute
+};
+
+/*
+ * Code generation
+ */
+
+static bool cmd_keep_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	/* Emit opcode */
+	sieve_operation_emit(cgenv->sblock, NULL, &cmd_keep_operation);
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, cmd, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool cmd_keep_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "KEEP");
+	sieve_code_descend(denv);
+
+	return ( sieve_action_opr_optional_dump(denv, address, NULL) == 0 );
+}
+
+/*
+ * Interpretation
+ */
+
+static int cmd_keep_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	struct sieve_side_effects_list *slist = NULL;
+	int ret = 0;
+
+	/*
+	 * Read data
+	 */
+
+	/* Optional operands (side effects only) */
+	if ( sieve_action_opr_optional_read(renv, address, NULL, &ret, &slist) != 0 )
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_ACTIONS,
+		"keep action; store message in default mailbox");
+
+	/* Add keep action to result.
+	 */
+	if ( sieve_result_add_keep(renv, slist) < 0 )
+		return SIEVE_EXEC_FAILURE;
+
+	return SIEVE_EXEC_OK;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/cmd-redirect.c b/pigeonhole/src/lib-sieve/cmd-redirect.c
new file mode 100644
index 0000000..6a3b0a4
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/cmd-redirect.c
@@ -0,0 +1,677 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "str-sanitize.h"
+#include "strfuncs.h"
+#include "istream.h"
+#include "istream-header-filter.h"
+#include "ostream.h"
+#include "mail-storage.h"
+
+#include "rfc2822.h"
+
+#include "sieve-common.h"
+#include "sieve-limits.h"
+#include "sieve-address.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-message.h"
+#include "sieve-actions.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-code-dumper.h"
+#include "sieve-result.h"
+#include "sieve-smtp.h"
+#include "sieve-message.h"
+
+#include <stdio.h>
+
+/*
+ * Redirect command
+ *
+ * Syntax
+ *   redirect <address: string>
+ */
+
+static bool
+cmd_redirect_validate(struct sieve_validator *validator,
+		      struct sieve_command *cmd);
+static bool
+cmd_redirect_generate(const struct sieve_codegen_env *cgenv,
+		      struct sieve_command *cmd);
+
+const struct sieve_command_def cmd_redirect = {
+	.identifier = "redirect",
+	.type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = cmd_redirect_validate,
+	.generate = cmd_redirect_generate
+};
+
+/*
+ * Redirect operation
+ */
+
+static bool
+cmd_redirect_operation_dump(const struct sieve_dumptime_env *denv,
+			    sieve_size_t *address);
+static int
+cmd_redirect_operation_execute(const struct sieve_runtime_env *renv,
+			       sieve_size_t *address);
+
+const struct sieve_operation_def cmd_redirect_operation = {
+	.mnemonic = "REDIRECT",
+	.code = SIEVE_OPERATION_REDIRECT,
+	.dump = cmd_redirect_operation_dump,
+	.execute = cmd_redirect_operation_execute
+};
+
+/*
+ * Redirect action
+ */
+
+static bool
+act_redirect_equals(const struct sieve_script_env *senv,
+		    const struct sieve_action *act1,
+		    const struct sieve_action *act2);
+static int
+act_redirect_check_duplicate(const struct sieve_runtime_env *renv,
+			     const struct sieve_action *act,
+			     const struct sieve_action *act_other);
+static void
+act_redirect_print(const struct sieve_action *action,
+		   const struct sieve_result_print_env *rpenv, bool *keep);
+
+static int
+act_redirect_start(const struct sieve_action_exec_env *aenv, void **tr_context);
+static int
+act_redirect_execute(const struct sieve_action_exec_env *aenv, void *tr_context,
+		    bool *keep);
+static int
+act_redirect_commit(const struct sieve_action_exec_env *aenv, void *tr_context);
+
+const struct sieve_action_def act_redirect = {
+	.name = "redirect",
+	.flags = SIEVE_ACTFLAG_TRIES_DELIVER,
+	.equals = act_redirect_equals,
+	.check_duplicate = act_redirect_check_duplicate,
+	.print = act_redirect_print,
+	.start = act_redirect_start,
+	.execute = act_redirect_execute,
+	.commit = act_redirect_commit,
+};
+
+/*
+ * Validation
+ */
+
+static bool
+cmd_redirect_validate(struct sieve_validator *validator,
+		      struct sieve_command *cmd)
+{
+	struct sieve_instance *svinst = sieve_validator_svinst(validator);
+	struct sieve_ast_argument *arg = cmd->first_positional;
+
+	/* Check and activate address argument */
+
+	if (!sieve_validate_positional_argument(validator, cmd, arg, "address",
+						1, SAAT_STRING))
+		return FALSE;
+
+	if (!sieve_validator_argument_activate(validator, cmd, arg, FALSE))
+		return FALSE;
+
+	/* We can only assess the validity of the outgoing address when it is
+	 * a string literal. For runtime-generated strings this needs to be
+	 * done at runtime.
+	 */
+	if (sieve_argument_is_string_literal(arg)) {
+		string_t *raw_address = sieve_ast_argument_str(arg);
+		const char *error;
+		bool result;
+
+		T_BEGIN {
+			/* Parse the address */
+			result = sieve_address_validate_str(raw_address, &error);
+			if (!result) {
+				sieve_argument_validate_error(
+					validator, arg,
+					"specified redirect address '%s' is invalid: %s",
+					str_sanitize(str_c(raw_address),128),
+					error);
+			}
+		} T_END;
+
+		return result;
+	}
+
+	if (svinst->max_redirects == 0) {
+		sieve_command_validate_error(validator, cmd,
+			"local policy prohibits the use of a redirect action");
+		return FALSE;
+	}
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool
+cmd_redirect_generate(const struct sieve_codegen_env *cgenv,
+		      struct sieve_command *cmd)
+{
+	sieve_operation_emit(cgenv->sblock, NULL,  &cmd_redirect_operation);
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, cmd, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+cmd_redirect_operation_dump(const struct sieve_dumptime_env *denv,
+			    sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "REDIRECT");
+	sieve_code_descend(denv);
+
+	if (sieve_action_opr_optional_dump(denv, address, NULL) != 0)
+		return FALSE;
+
+	return sieve_opr_string_dump(denv, address, "address");
+}
+
+/*
+ * Code execution
+ */
+
+static int
+cmd_redirect_operation_execute(const struct sieve_runtime_env *renv,
+			       sieve_size_t *address)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	struct sieve_instance *svinst = eenv->svinst;
+	struct sieve_side_effects_list *slist = NULL;
+	string_t *redirect;
+	const struct smtp_address *to_address;
+	const char *error;
+	int ret;
+
+	/*
+	 * Read data
+	 */
+
+	/* Optional operands (side effects only) */
+	if (sieve_action_opr_optional_read(renv, address, NULL,
+					   &ret, &slist) != 0)
+		return ret;
+
+	/* Read the address */
+	if ((ret = sieve_opr_string_read(renv, address, "address",
+					 &redirect)) <= 0)
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	/* Parse the address */
+	to_address = sieve_address_parse_str(redirect, &error);
+	if (to_address == NULL) {
+		sieve_runtime_error(renv, NULL,
+			"specified redirect address '%s' is invalid: %s",
+			str_sanitize(str_c(redirect),128), error);
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	if (svinst->max_redirects == 0) {
+		sieve_runtime_error(renv, NULL,
+			"local policy prohibits the use of a redirect action");
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_ACTIONS)) {
+		sieve_runtime_trace(renv, 0, "redirect action");
+		sieve_runtime_trace_descend(renv);
+		sieve_runtime_trace(renv, 0, "forward message to address %s",
+			smtp_address_encode_path(to_address));
+	}
+
+	/* Add redirect action to the result */
+
+	return sieve_act_redirect_add_to_result(renv, "redirect", slist,
+						to_address);
+}
+
+/*
+ * Action implementation
+ */
+
+struct act_redirect_transaction {
+	const char *msg_id, *new_msg_id;
+	const char *dupeid;
+
+	bool skip_redirect:1;
+};
+
+static bool
+act_redirect_equals(const struct sieve_script_env *senv ATTR_UNUSED,
+		    const struct sieve_action *act1,
+		    const struct sieve_action *act2)
+{
+	struct act_redirect_context *rd_ctx1 =
+		(struct act_redirect_context *)act1->context;
+	struct act_redirect_context *rd_ctx2 =
+		(struct act_redirect_context *)act2->context;
+
+	/* Address is already normalized */
+	return (smtp_address_equals(rd_ctx1->to_address, rd_ctx2->to_address));
+}
+
+static int
+act_redirect_check_duplicate(const struct sieve_runtime_env *renv,
+			     const struct sieve_action *act,
+			     const struct sieve_action *act_other)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+
+	return (act_redirect_equals(eenv->scriptenv, act, act_other) ? 1 : 0);
+}
+
+static void
+act_redirect_print(const struct sieve_action *action,
+		   const struct sieve_result_print_env *rpenv, bool *keep)
+{
+	struct act_redirect_context *ctx =
+		(struct act_redirect_context *)action->context;
+
+	sieve_result_action_printf(rpenv, "redirect message to: %s",
+				   smtp_address_encode_path(ctx->to_address));
+	*keep = FALSE;
+}
+
+static int
+act_redirect_send(const struct sieve_action_exec_env *aenv, struct mail *mail,
+		  struct act_redirect_context *ctx, const char *new_msg_id)
+		  ATTR_NULL(4)
+{
+	static const char *hide_headers[] = { "Return-Path" };
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct sieve_instance *svinst = eenv->svinst;
+	struct sieve_message_context *msgctx = aenv->msgctx;
+	const struct sieve_script_env *senv = eenv->scriptenv;
+	struct sieve_address_source env_from = svinst->redirect_from;
+	struct istream *input;
+	struct ostream *output;
+	const struct smtp_address *sender;
+	const char *error;
+	struct sieve_smtp_context *sctx;
+	int ret;
+
+	/* Just to be sure */
+	if (!sieve_smtp_available(senv)) {
+		sieve_result_global_warning(aenv, "no means to send mail");
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	if (mail_get_stream(mail, NULL, NULL, &input) < 0) {
+		return sieve_result_mail_error(aenv, mail,
+					       "failed to read input message");
+	}
+
+	/* Determine which sender to use
+
+	   From RFC 5228, Section 4.2:
+
+	   The envelope sender address on the outgoing message is chosen by the
+	   sieve implementation. It MAY be copied from the message being
+	   processed. However, if the message being processed has an empty
+	   envelope sender address the outgoing message MUST also have an empty
+	   envelope sender address. This last requirement is imposed to prevent
+	   loops in the case where a message is redirected to an invalid address
+	   when then returns a delivery status notification that also ends up
+	   being redirected to the same invalid address.
+	 */
+	if ((eenv->flags & SIEVE_EXECUTE_FLAG_NO_ENVELOPE) == 0) {
+		/* Envelope available */
+		sender = sieve_message_get_sender(msgctx);
+		if (sender != NULL &&
+		    sieve_address_source_get_address(&env_from, svinst, senv,
+						     msgctx, eenv->flags,
+						     &sender) < 0)
+			sender = NULL;
+	} else {
+		/* No envelope available */
+		ret = sieve_address_source_get_address(&env_from, svinst, senv,
+						       msgctx, eenv->flags,
+						       &sender);
+		if (ret < 0)
+			sender = NULL;
+		else if (ret == 0)
+			sender = svinst->user_email;
+	}
+
+	/* Open SMTP transport */
+	sctx = sieve_smtp_start_single(senv, ctx->to_address, sender, &output);
+
+	/* Remove unwanted headers */
+	input = i_stream_create_header_filter(
+		input, HEADER_FILTER_EXCLUDE | HEADER_FILTER_NO_CR,
+		hide_headers, N_ELEMENTS(hide_headers),
+		*null_header_filter_callback, (void *)NULL);
+
+	T_BEGIN {
+		string_t *hdr = t_str_new(256);
+		const struct smtp_address *user_email;
+
+		/* Prepend sieve headers (should not affect signatures) */
+		rfc2822_header_append(hdr, "X-Sieve", SIEVE_IMPLEMENTATION,
+				      FALSE, NULL);
+		if (svinst->user_email == NULL &&
+		    (eenv->flags & SIEVE_EXECUTE_FLAG_NO_ENVELOPE) == 0)
+			user_email = sieve_message_get_final_recipient(msgctx);
+		else
+			user_email = sieve_get_user_email(svinst);
+		if (user_email != NULL) {
+			rfc2822_header_append(hdr, "X-Sieve-Redirected-From",
+					      smtp_address_encode(user_email),
+					      FALSE, NULL);
+		}
+
+		/* Add new Message-ID if message doesn't have one */
+		if (new_msg_id != NULL)
+			rfc2822_header_write(hdr, "Message-ID", new_msg_id);
+
+		o_stream_nsend(output, str_data(hdr), str_len(hdr));
+	} T_END;
+
+	o_stream_nsend_istream(output, input);
+
+	if (input->stream_errno != 0) {
+		sieve_result_critical(aenv, "failed to read input message",
+				      "read(%s) failed: %s",
+				      i_stream_get_name(input),
+				      i_stream_get_error(input));
+		i_stream_unref(&input);
+		sieve_smtp_abort(sctx);
+		return SIEVE_EXEC_TEMP_FAILURE;
+	}
+	i_stream_unref(&input);
+
+	/* Close SMTP transport */
+	if ((ret = sieve_smtp_finish(sctx, &error)) <= 0) {
+		if (ret < 0) {
+			sieve_result_global_error(
+				aenv, "failed to redirect message to <%s>: %s "
+				"(temporary failure)",
+				smtp_address_encode(ctx->to_address),
+				str_sanitize(error, 512));
+			return SIEVE_EXEC_TEMP_FAILURE;
+		}
+
+		sieve_result_global_log_error(
+			aenv, "failed to redirect message to <%s>: %s "
+			"(permanent failure)",
+			smtp_address_encode(ctx->to_address),
+			str_sanitize(error, 512));
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	return SIEVE_EXEC_OK;
+}
+
+static int
+act_redirect_get_duplicate_id(struct act_redirect_context *ctx,
+			      const struct sieve_action_exec_env *aenv,
+			      const char *msg_id, const char **dupeid_r)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct sieve_message_context *msgctx = aenv->msgctx;
+	const struct sieve_message_data *msgdata = eenv->msgdata;
+	struct mail *mail = msgdata->mail;
+	const struct smtp_address *recipient;
+	const char *resent_id = NULL, *list_id = NULL;
+
+	/* Read identifying headers */
+	if (mail_get_first_header(mail, "resent-message-id", &resent_id) < 0) {
+		return sieve_result_mail_error(
+			aenv, mail,
+			"failed to read header field `resent-message-id'");
+	}
+	if (resent_id == NULL &&
+	    mail_get_first_header(mail, "resent-from", &resent_id) < 0) {
+		return sieve_result_mail_error(
+			aenv, mail,
+			"failed to read header field `resent-from'");
+	}
+	if (mail_get_first_header(mail, "list-id", &list_id) < 0) {
+		return sieve_result_mail_error(
+			aenv, mail,
+			"failed to read header field `list-id'");
+	}
+
+	if ((eenv->flags & SIEVE_EXECUTE_FLAG_NO_ENVELOPE) == 0)
+		recipient = sieve_message_get_orig_recipient(msgctx);
+	else
+		recipient = sieve_get_user_email(eenv->svinst);
+
+	pool_t pool = sieve_result_pool(aenv->result);
+
+	/* Base the duplicate ID on:
+	   - the message id
+	   - the recipient running this Sieve script
+	   - redirect target address
+	   - if this message is resent: the message-id or from-address of
+		   the original message
+	   - if the message came through a mailing list: the mailinglist ID
+	 */
+	*dupeid_r = p_strdup_printf(
+		pool, "%s-%s-%s-%s-%s", msg_id,
+		(recipient != NULL ? smtp_address_encode(recipient) : ""),
+		smtp_address_encode(ctx->to_address),
+		(resent_id != NULL ? resent_id : ""),
+		(list_id != NULL ? list_id : ""));
+	return SIEVE_EXEC_OK;
+}
+
+static int
+act_redirect_check_loop_header(const struct sieve_action_exec_env *aenv,
+			       struct mail *mail, bool *loop_detected_r)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct sieve_message_context *msgctx = aenv->msgctx;
+	const char *const *headers;
+	const char *recipient, *user_email;
+	const struct smtp_address *addr;
+	int ret;
+
+	*loop_detected_r = FALSE;
+
+	ret = mail_get_headers(mail, "x-sieve-redirected-from", &headers);
+	if (ret < 0) {
+		return sieve_result_mail_error(
+			aenv, mail, "failed to read header field "
+			"`x-sieve-redirected-from'");
+	}
+
+	if (ret == 0)
+		return SIEVE_EXEC_OK;
+
+	recipient = user_email = NULL;
+	if ((eenv->flags & SIEVE_EXECUTE_FLAG_NO_ENVELOPE) == 0) {
+		addr = sieve_message_get_final_recipient(msgctx);
+		if (addr != NULL)
+			recipient = smtp_address_encode(addr);
+	}
+	addr = sieve_get_user_email(eenv->svinst);
+	if (addr != NULL)
+		user_email = smtp_address_encode(addr);
+
+	while (*headers != NULL) {
+		const char *header = t_str_trim(*headers, " \t\r\n");
+		if (recipient != NULL && strcmp(header, recipient) == 0) {
+			*loop_detected_r = TRUE;
+			break;
+		}
+		if (user_email != NULL && strcmp(header, user_email) == 0) {
+			*loop_detected_r = TRUE;
+			break;
+		}
+		headers++;
+	}
+
+	return SIEVE_EXEC_OK;
+}
+
+static int
+act_redirect_start(const struct sieve_action_exec_env *aenv, void **tr_context)
+{
+	struct act_redirect_transaction *trans;
+	pool_t pool = sieve_result_pool(aenv->result);
+
+	/* Create transaction context */
+	trans = p_new(pool, struct act_redirect_transaction, 1);
+	*tr_context = trans;
+
+	return SIEVE_EXEC_OK;
+}
+
+static int
+act_redirect_execute(const struct sieve_action_exec_env *aenv,
+		     void *tr_context, bool *keep)
+{
+	const struct sieve_action *action = aenv->action;
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct sieve_instance *svinst = eenv->svinst;
+	struct act_redirect_context *ctx =
+		(struct act_redirect_context *)action->context;
+	struct act_redirect_transaction *trans = tr_context;
+	struct sieve_message_context *msgctx = aenv->msgctx;
+	struct mail *mail = (action->mail != NULL ?
+			     action->mail : sieve_message_get_mail(msgctx));
+	const struct sieve_message_data *msgdata = eenv->msgdata;
+	bool duplicate, loop_detected = FALSE;
+	int ret;
+
+	/*
+	 * Prevent mail loops
+	 */
+
+	/* Create Message-ID for the message if it has none */
+	trans->msg_id = msgdata->id;
+	if (trans->msg_id == NULL) {
+		pool_t pool = sieve_result_pool(aenv->result);
+		const char *msg_id;
+		if (mail_get_message_id_no_validation(msgdata->mail, &msg_id) > 0)
+			trans->msg_id = p_strdup(pool, msg_id);
+		else {
+			msg_id = sieve_message_get_new_id(svinst);
+			trans->msg_id = trans->new_msg_id = p_strdup(pool, msg_id);
+		}
+	}
+
+	/* Create ID for duplicate database lookup */
+	ret = act_redirect_get_duplicate_id(ctx, aenv, trans->msg_id,
+					    &trans->dupeid);
+	if (ret != SIEVE_EXEC_OK)
+		return ret;
+	i_assert(trans->dupeid != NULL);
+
+	/* Check whether we've seen this message before */
+	ret = sieve_action_duplicate_check(aenv, trans->dupeid,
+					   strlen(trans->dupeid),
+					   &duplicate);
+	if (ret < SIEVE_EXEC_OK) {
+		sieve_result_critical(
+			aenv, "failed to check for duplicate forward",
+			"failed to check for duplicate forward to <%s>%s",
+			smtp_address_encode(ctx->to_address),
+			(ret == SIEVE_EXEC_TEMP_FAILURE ?
+			 " (temporaty failure)" : ""));
+		return ret;
+	}
+	if (duplicate) {
+		sieve_result_global_log(
+			aenv, "discarded duplicate forward to <%s>",
+			smtp_address_encode(ctx->to_address));
+		trans->skip_redirect = TRUE;
+		return SIEVE_EXEC_OK;
+	}
+
+	/* Check whether we've seen this message before based on added headers
+	 */
+	ret = act_redirect_check_loop_header(aenv, mail, &loop_detected);
+	if (ret != SIEVE_EXEC_OK)
+		return ret;
+	if (loop_detected) {
+		sieve_result_global_log(
+			aenv, "not forwarding message to <%s>: "
+			"the `x-sieve-redirected-from' header indicates a mail loop",
+			smtp_address_encode(ctx->to_address));
+		trans->skip_redirect = TRUE;
+		return SIEVE_EXEC_OK;
+	}
+
+	/* Cancel implicit keep */
+	*keep = FALSE;
+
+	return SIEVE_EXEC_OK;
+}
+
+static int
+act_redirect_commit(const struct sieve_action_exec_env *aenv, void *tr_context)
+{
+	const struct sieve_action *action = aenv->action;
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct sieve_instance *svinst = eenv->svinst;
+	struct act_redirect_context *ctx =
+		(struct act_redirect_context *)action->context;
+	struct sieve_message_context *msgctx = aenv->msgctx;
+	struct mail *mail = (action->mail != NULL ?
+			     action->mail : sieve_message_get_mail(msgctx));
+	struct act_redirect_transaction *trans = tr_context;
+	int ret;
+
+	if (trans->skip_redirect)
+		return SIEVE_EXEC_OK;
+
+	/*
+	 * Try to forward the message
+	 */
+
+	ret = act_redirect_send(aenv, mail, ctx, trans->new_msg_id);
+	if (ret == SIEVE_EXEC_OK) {
+		/* Mark this message id as forwarded to the specified
+		   destination */
+		sieve_action_duplicate_mark(
+			aenv, trans->dupeid, strlen(trans->dupeid),
+			ioloop_time + svinst->redirect_duplicate_period);
+
+		eenv->exec_status->significant_action_executed = TRUE;
+
+		struct event_passthrough *e =
+			sieve_action_create_finish_event(aenv)->
+			add_str("redirect_target",
+				smtp_address_encode(ctx->to_address));
+
+		sieve_result_event_log(aenv, e->event(),
+				       "forwarded to <%s>",
+				       smtp_address_encode(ctx->to_address));
+
+		/* Indicate that message was successfully forwarded */
+		eenv->exec_status->message_forwarded = TRUE;
+
+		return SIEVE_EXEC_OK;
+	}
+
+	return ret;
+}
diff --git a/pigeonhole/src/lib-sieve/cmd-require.c b/pigeonhole/src/lib-sieve/cmd-require.c
new file mode 100644
index 0000000..93a2a26
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/cmd-require.c
@@ -0,0 +1,86 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-extensions.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+
+/*
+ * Require command
+ *
+ * Syntax
+ *   Syntax: require <capabilities: string-list>
+ */
+
+static bool cmd_require_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+
+const struct sieve_command_def cmd_require = {
+	.identifier = "require",
+	.type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = cmd_require_validate
+};
+
+/*
+ * Validation
+ */
+
+static bool cmd_require_validate
+(struct sieve_validator *valdtr, struct sieve_command *cmd)
+{
+	bool result = TRUE;
+	struct sieve_ast_argument *arg;
+	struct sieve_command *prev = sieve_command_prev(cmd);
+
+	/* Check valid command placement */
+	if ( !sieve_command_is_toplevel(cmd) ||
+		( !sieve_command_is_first(cmd) && prev != NULL &&
+			!sieve_command_is(prev, cmd_require) ) )
+	{
+		sieve_command_validate_error(valdtr, cmd,
+			"require commands can only be placed at top level "
+			"at the beginning of the file");
+		return FALSE;
+	}
+
+	/* Check argument and load specified extension(s) */
+
+	arg = cmd->first_positional;
+	if ( sieve_ast_argument_type(arg) == SAAT_STRING ) {
+		/* Single string */
+		const struct sieve_extension *ext = sieve_validator_extension_load_by_name
+			(valdtr, cmd, arg, sieve_ast_argument_strc(arg));
+
+		if ( ext == NULL ) result = FALSE;
+
+	} else if ( sieve_ast_argument_type(arg) == SAAT_STRING_LIST ) {
+		/* String list */
+		struct sieve_ast_argument *stritem = sieve_ast_strlist_first(arg);
+
+		while ( stritem != NULL ) {
+			const struct sieve_extension *ext = sieve_validator_extension_load_by_name
+				(valdtr, cmd, stritem, sieve_ast_strlist_strc(stritem));
+
+			if ( ext == NULL ) result = FALSE;
+
+			stritem = sieve_ast_strlist_next(stritem);
+		}
+	} else {
+		/* Something else */
+		sieve_argument_validate_error(valdtr, arg,
+			"the require command accepts a single string or string list argument, "
+			"but %s was found",
+			sieve_ast_argument_name(arg));
+		return FALSE;
+	}
+
+	return result;
+}
diff --git a/pigeonhole/src/lib-sieve/cmd-stop.c b/pigeonhole/src/lib-sieve/cmd-stop.c
new file mode 100644
index 0000000..23acadb
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/cmd-stop.c
@@ -0,0 +1,86 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+
+/*
+ * Stop command
+ *
+ * Syntax
+ *   stop
+ */
+
+static bool cmd_stop_generate
+	(const struct sieve_codegen_env *cgenv,
+		struct sieve_command *ctx ATTR_UNUSED);
+static bool cmd_stop_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+
+const struct sieve_command_def cmd_stop = {
+	.identifier = "stop",
+	.type = SCT_COMMAND,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = cmd_stop_validate,
+	.generate = cmd_stop_generate
+};
+
+/*
+ * Stop operation
+ */
+
+static int opc_stop_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def cmd_stop_operation = {
+	.mnemonic = "STOP",
+	.code = SIEVE_OPERATION_STOP,
+	.execute = opc_stop_execute
+};
+
+/*
+ * Command validation
+ */
+
+static bool cmd_stop_validate
+(struct sieve_validator *valdtr ATTR_UNUSED, struct sieve_command *cmd)
+{
+	sieve_command_exit_block_unconditionally(cmd);
+
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool cmd_stop_generate
+(const struct sieve_codegen_env *cgenv,
+	struct sieve_command *cmd ATTR_UNUSED)
+{
+	sieve_operation_emit(cgenv->sblock, NULL, &cmd_stop_operation);
+
+	return TRUE;
+}
+
+/*
+ * Code execution
+ */
+
+static int opc_stop_execute
+(const struct sieve_runtime_env *renv,  sieve_size_t *address ATTR_UNUSED)
+{
+	sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS,
+		"stop command; end all script execution");
+
+	sieve_interpreter_interrupt(renv->interp);
+
+	return SIEVE_EXEC_OK;
+}
+
diff --git a/pigeonhole/src/lib-sieve/cmp-i-ascii-casemap.c b/pigeonhole/src/lib-sieve/cmp-i-ascii-casemap.c
new file mode 100644
index 0000000..4f0dab4
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/cmp-i-ascii-casemap.c
@@ -0,0 +1,99 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Comparator 'i;ascii-casemap':
+ *
+ */
+
+#include "lib.h"
+
+#include "sieve-common.h"
+#include "sieve-comparators.h"
+
+#include <string.h>
+#include <stdio.h>
+#include <ctype.h>
+
+/*
+ * Forward declarations
+ */
+
+static int cmp_i_ascii_casemap_compare
+	(const struct sieve_comparator *cmp,
+		const char *val1, size_t val1_size, const char *val2, size_t val2_size);
+static bool cmp_i_ascii_casemap_char_match
+	(const struct sieve_comparator *cmp, const char **val1, const char *val1_end,
+		const char **val2, const char *val2_end);
+
+/*
+ * Comparator object
+ */
+
+const struct sieve_comparator_def i_ascii_casemap_comparator = {
+	SIEVE_OBJECT("i;ascii-casemap",
+		&comparator_operand, SIEVE_COMPARATOR_I_ASCII_CASEMAP),
+	.flags =
+		SIEVE_COMPARATOR_FLAG_ORDERING |
+		SIEVE_COMPARATOR_FLAG_EQUALITY |
+		SIEVE_COMPARATOR_FLAG_SUBSTRING_MATCH |
+		SIEVE_COMPARATOR_FLAG_PREFIX_MATCH,
+	.compare = cmp_i_ascii_casemap_compare,
+	.char_match = cmp_i_ascii_casemap_char_match,
+	.char_skip = sieve_comparator_octet_skip
+};
+
+/*
+ * Comparator implementation
+ */
+
+static int cmp_i_ascii_casemap_compare(
+	const struct sieve_comparator *cmp ATTR_UNUSED,
+	const char *val1, size_t val1_size, const char *val2, size_t val2_size)
+{
+	int result;
+
+	if ( val1_size == val2_size ) {
+		return strncasecmp(val1, val2, val1_size);
+	}
+
+	if ( val1_size > val2_size ) {
+		result = strncasecmp(val1, val2, val2_size);
+
+		if ( result == 0 ) return 1;
+
+		return result;
+	}
+
+	result = strncasecmp(val1, val2, val1_size);
+
+	if ( result == 0 ) return -1;
+
+	return result;
+}
+
+static bool cmp_i_ascii_casemap_char_match
+	(const struct sieve_comparator *cmp ATTR_UNUSED,
+		const char **val, const char *val_end,
+		const char **key, const char *key_end)
+{
+	const char *val_begin = *val;
+	const char *key_begin = *key;
+
+	while ( i_tolower(**val) == i_tolower(**key) &&
+		*val < val_end && *key < key_end ) {
+		(*val)++;
+		(*key)++;
+	}
+
+	if ( *key < key_end ) {
+		/* Reset */
+		*val = val_begin;
+		*key = key_begin;
+
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/cmp-i-octet.c b/pigeonhole/src/lib-sieve/cmp-i-octet.c
new file mode 100644
index 0000000..caa46fa
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/cmp-i-octet.c
@@ -0,0 +1,97 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Comparator 'i;octet':
+ *
+ */
+
+#include "lib.h"
+
+#include "sieve-common.h"
+#include "sieve-comparators.h"
+
+#include <string.h>
+#include <stdio.h>
+
+/*
+ * Forward declarations
+ */
+
+static int cmp_i_octet_compare
+	(const struct sieve_comparator *cmp,
+		const char *val1, size_t val1_size, const char *val2, size_t val2_size);
+static bool cmp_i_octet_char_match
+	(const struct sieve_comparator *cmp, const char **val1, const char *val1_end,
+		const char **val2, const char *val2_end);
+
+/*
+ * Comparator object
+ */
+
+const struct sieve_comparator_def i_octet_comparator = {
+	SIEVE_OBJECT("i;octet",
+		&comparator_operand, SIEVE_COMPARATOR_I_OCTET),
+	.flags =
+		SIEVE_COMPARATOR_FLAG_ORDERING |
+		SIEVE_COMPARATOR_FLAG_EQUALITY |
+		SIEVE_COMPARATOR_FLAG_SUBSTRING_MATCH |
+		SIEVE_COMPARATOR_FLAG_PREFIX_MATCH,
+	.compare = cmp_i_octet_compare,
+	.char_match = cmp_i_octet_char_match,
+	.char_skip = sieve_comparator_octet_skip
+};
+
+/*
+ * Comparator implementation
+ */
+
+static int cmp_i_octet_compare(
+	const struct sieve_comparator *cmp ATTR_UNUSED,
+	const char *val1, size_t val1_size, const char *val2, size_t val2_size)
+{
+	int result;
+
+	if ( val1_size == val2_size ) {
+		return memcmp((void *) val1, (void *) val2, val1_size);
+	}
+
+	if ( val1_size > val2_size ) {
+		result = memcmp((void *) val1, (void *) val2, val2_size);
+
+		if ( result == 0 ) return 1;
+
+		return result;
+	}
+
+	result = memcmp((void *) val1, (void *) val2, val1_size);
+
+	if ( result == 0 ) return -1;
+
+	return result;
+}
+
+static bool cmp_i_octet_char_match
+	(const struct sieve_comparator *cmp ATTR_UNUSED,
+		const char **val, const char *val_end,
+		const char **key, const char *key_end)
+{
+	const char *val_begin = *val;
+	const char *key_begin = *key;
+
+	while ( **val == **key && *val < val_end && *key < key_end ) {
+		(*val)++;
+		(*key)++;
+	}
+
+	if ( *key < key_end ) {
+		/* Reset */
+		*val = val_begin;
+		*key = key_begin;
+
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/ext-encoded-character.c b/pigeonhole/src/lib-sieve/ext-encoded-character.c
new file mode 100644
index 0000000..d9e2b18
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/ext-encoded-character.c
@@ -0,0 +1,271 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension encoded-character
+ * ---------------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 5228
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "lib.h"
+#include "unichar.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+
+#include <ctype.h>
+
+/*
+ * Extension
+ */
+
+static bool ext_encoded_character_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+
+const struct sieve_extension_def encoded_character_extension = {
+	.name = "encoded-character",
+	.validator_load = ext_encoded_character_validator_load,
+};
+
+/*
+ * Encoded string argument
+ */
+
+bool arg_encoded_string_validate
+	(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *context);
+
+const struct sieve_argument_def encoded_string_argument = {
+	.identifier = "@encoded-string",
+	.validate = arg_encoded_string_validate
+};
+
+/* Parsing */
+
+static bool _skip_whitespace
+	(const char **in, const char *inend)
+{
+	while ( *in < inend ) {
+		if ( **in == '\r' ) {
+			(*in)++;
+			if ( **in != '\n' )
+				return FALSE;
+			continue;
+		}
+
+		/* (Loose LF is non-standard) */
+		if ( **in != ' ' && **in != '\n' && **in != '\t' )
+			break;
+
+		(*in)++;
+	}
+
+	return TRUE;
+}
+
+static bool _parse_hexint
+(const char **in, const char *inend, int max_digits, unsigned int *result)
+{
+	int digit = 0;
+	*result = 0;
+
+	while ( *in < inend && (max_digits == 0 || digit < max_digits) ) {
+
+		if ( (**in) >= '0' && (**in) <= '9' )
+			*result = ((*result) << 4) + (**in) - ((unsigned int) '0');
+		else if ( (**in) >= 'a' && (**in) <= 'f' )
+			*result = ((*result) << 4) + (**in) - ((unsigned int) 'a') + 0x0a;
+		else if ( (**in) >= 'A' && (**in) <= 'F' )
+			*result = ((*result) << 4) + (**in) - ((unsigned int) 'A') + 0x0a;
+		else
+			return ( digit > 0 );
+
+		(*in)++;
+		digit++;
+	}
+
+	if ( digit == max_digits ) {
+		/* Hex digit _MUST_ end here */
+		if ( (**in >= '0' && **in <= '9')	|| (**in >= 'a' && **in <= 'f') ||
+			(**in >= 'A' && **in <= 'F') )
+			return FALSE;
+
+		return TRUE;
+	}
+
+	return ( digit > 0 );
+}
+
+static bool _decode_hex
+(const char **in, const char *inend, string_t *result)
+{
+	int values = 0;
+
+	while ( *in < inend ) {
+		unsigned int hexpair;
+
+		if ( !_skip_whitespace(in, inend) ) return FALSE;
+
+		if ( !_parse_hexint(in, inend, 2, &hexpair) ) break;
+
+		str_append_c(result, (unsigned char) hexpair);
+		values++;
+	}
+
+	return ( values > 0 );
+}
+
+static bool _decode_unicode
+(const char **in, const char *inend, string_t *result,
+	unsigned int *error_hex)
+{
+	int values = 0;
+	bool valid = TRUE;
+
+	while ( *in < inend ) {
+		unsigned int unicode_hex;
+
+		if ( !_skip_whitespace(in, inend) ) return FALSE;
+
+		if ( !_parse_hexint(in, inend, 0, &unicode_hex) ) break;
+
+		if ( uni_is_valid_ucs4((unichar_t) unicode_hex) )
+			uni_ucs4_to_utf8_c((unichar_t) unicode_hex, result);
+		else {
+			if ( valid ) *error_hex = unicode_hex;
+			valid = FALSE;
+		}
+		values++;
+	}
+
+	return ( values > 0 );
+}
+
+bool arg_encoded_string_validate
+(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *cmd)
+{
+	bool result = TRUE;
+	enum { ST_NONE, ST_OPEN, ST_TYPE, ST_CLOSE }
+		state = ST_NONE;
+	string_t *str = sieve_ast_argument_str(*arg);
+	string_t *tmpstr, *newstr = NULL;
+	const char *p, *mark, *strstart, *substart = NULL;
+	const char *strval = (const char *) str_data(str);
+	const char *strend = strval + str_len(str);
+	unsigned int error_hex = 0;
+
+	T_BEGIN {
+		tmpstr = t_str_new(32);
+
+		p = strval;
+		strstart = p;
+		while ( result && p < strend ) {
+			switch ( state ) {
+			/* Normal string */
+			case ST_NONE:
+				if ( *p == '$' ) {
+					substart = p;
+					state = ST_OPEN;
+				}
+				p++;
+				break;
+			/* Parsed '$' */
+			case ST_OPEN:
+				if ( *p == '{' ) {
+					state = ST_TYPE;
+					p++;
+				} else
+					state = ST_NONE;
+				break;
+			/* Parsed '${' */
+			case ST_TYPE:
+				mark = p;
+				/* Scan for 'hex' or 'unicode' */
+				while ( p < strend && i_isalpha(*p) ) p++;
+
+				if ( *p != ':' ) {
+					state = ST_NONE;
+					break;
+				}
+
+				state = ST_CLOSE;
+
+				str_truncate(tmpstr, 0);
+				if ( strncasecmp(mark, "hex", p - mark) == 0 ) {
+					/* Hexadecimal */
+					p++;
+					if ( !_decode_hex(&p, strend, tmpstr) )
+						state = ST_NONE;
+				} else if ( strncasecmp(mark, "unicode", p - mark) == 0 ) {
+					/* Unicode */
+					p++;
+					if ( !_decode_unicode(&p, strend, tmpstr, &error_hex) )
+						state = ST_NONE;
+				} else {
+					/* Invalid encoding */
+					p++;
+					state = ST_NONE;
+				}
+				break;
+			case ST_CLOSE:
+				if ( *p == '}' ) {
+					/* We now know that the substitution is valid */
+
+					if ( error_hex != 0 ) {
+						sieve_argument_validate_error(valdtr, *arg,
+							"invalid unicode character 0x%08x in encoded character substitution",
+							error_hex);
+						result = FALSE;
+						break;
+					}
+
+					if ( newstr == NULL ) {
+						newstr = str_new(sieve_ast_pool((*arg)->ast), str_len(str)*2);
+					}
+
+					str_append_data(newstr, strstart, substart-strstart);
+					str_append_str(newstr, tmpstr);
+
+					strstart = p + 1;
+					substart = strstart;
+
+					p++;
+				}
+				state = ST_NONE;
+			}
+		}
+	} T_END;
+
+	if ( !result ) return FALSE;
+
+	if ( newstr != NULL ) {
+		if ( strstart != strend )
+			str_append_data(newstr, strstart, strend-strstart);
+
+		sieve_ast_argument_string_set(*arg, newstr);
+	}
+
+	/* Pass the processed string to a (possible) next layer of processing */
+	return sieve_validator_argument_activate_super
+		(valdtr, cmd, *arg, TRUE);
+}
+
+/*
+ * Extension implementation
+ */
+
+static bool ext_encoded_character_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	/* Override the constant string argument with our own */
+	sieve_validator_argument_override
+		(valdtr, SAT_CONST_STRING, ext, &encoded_string_argument);
+
+	return TRUE;
+}
diff --git a/pigeonhole/src/lib-sieve/ext-envelope.c b/pigeonhole/src/lib-sieve/ext-envelope.c
new file mode 100644
index 0000000..e889cff
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/ext-envelope.c
@@ -0,0 +1,732 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension envelope
+ * ------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 5228
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+#include "array.h"
+
+#include "sieve-common.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-address.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-address-parts.h"
+#include "sieve-message.h"
+
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-match.h"
+
+/*
+ * Forward declarations
+ */
+
+static const struct sieve_command_def envelope_test;
+const struct sieve_operation_def envelope_operation;
+const struct sieve_extension_def envelope_extension;
+
+/*
+ * Extension
+ */
+
+static bool
+ext_envelope_validator_load(const struct sieve_extension *ext,
+			    struct sieve_validator *valdtr);
+static bool
+ext_envelope_interpreter_load(const struct sieve_extension *ext,
+			      const struct sieve_runtime_env *renv,
+			      sieve_size_t *address);
+
+static bool
+ext_envelope_validator_validate(const struct sieve_extension *ext,
+				struct sieve_validator *valdtr, void *context,
+				struct sieve_ast_argument *require_arg,
+				bool required);
+static int
+ext_envelope_interpreter_run(const struct sieve_extension *this_ext,
+			     const struct sieve_runtime_env *renv,
+			     void *context, bool deferred);
+
+const struct sieve_extension_def envelope_extension = {
+	.name = "envelope",
+	.interpreter_load = ext_envelope_interpreter_load,
+	.validator_load = ext_envelope_validator_load,
+	SIEVE_EXT_DEFINE_OPERATION(envelope_operation)
+};
+const struct sieve_validator_extension
+envelope_validator_extension = {
+	.ext = &envelope_extension,
+	.validate = ext_envelope_validator_validate
+};
+const struct sieve_interpreter_extension
+envelope_interpreter_extension = {
+	.ext_def = &envelope_extension,
+	.run = ext_envelope_interpreter_run
+};
+
+static bool
+ext_envelope_validator_load(const struct sieve_extension *ext,
+			    struct sieve_validator *valdtr)
+{
+	/* Register new test */
+	sieve_validator_register_command(valdtr, ext, &envelope_test);
+
+	sieve_validator_extension_register(valdtr, ext,
+					   &envelope_validator_extension, NULL);
+	return TRUE;
+}
+
+static bool
+ext_envelope_interpreter_load(const struct sieve_extension *ext,
+			      const struct sieve_runtime_env *renv,
+			      sieve_size_t *address ATTR_UNUSED)
+{
+	sieve_interpreter_extension_register(renv->interp, ext,
+					     &envelope_interpreter_extension,
+					     NULL);
+	return TRUE;
+}
+
+static bool
+ext_envelope_validator_validate(const struct sieve_extension *ext,
+				struct sieve_validator *valdtr,
+				void *context ATTR_UNUSED,
+				struct sieve_ast_argument *require_arg,
+				bool required)
+{
+	if (required) {
+		enum sieve_compile_flags flags =
+			sieve_validator_compile_flags(valdtr);
+
+		if ((flags & SIEVE_COMPILE_FLAG_NO_ENVELOPE) != 0) {
+			sieve_argument_validate_error(
+				valdtr, require_arg,
+				"the %s extension cannot be used in this context "
+				"(needs access to message envelope)",
+				sieve_extension_name(ext));
+			return FALSE;
+		}
+	}
+	return TRUE;
+}
+
+static int
+ext_envelope_interpreter_run(const struct sieve_extension *ext,
+			     const struct sieve_runtime_env *renv,
+			     void *context ATTR_UNUSED, bool deferred)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+
+	if ((eenv->flags & SIEVE_EXECUTE_FLAG_NO_ENVELOPE) != 0) {
+		if (!deferred) {
+			sieve_runtime_error(
+				renv, NULL,
+				"the %s extension cannot be used in this context "
+				"(needs access to message envelope)",
+				sieve_extension_name(ext));
+		}
+		return SIEVE_EXEC_FAILURE;
+	}
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Envelope test
+ *
+ * Syntax
+ *   envelope [COMPARATOR] [ADDRESS-PART] [MATCH-TYPE]
+ *     <envelope-part: string-list> <key-list: string-list>
+ */
+
+static bool
+tst_envelope_registered(struct sieve_validator *valdtr,
+			const struct sieve_extension *ext,
+			struct sieve_command_registration *cmd_reg);
+static bool
+tst_envelope_validate(struct sieve_validator *valdtr,
+		      struct sieve_command *tst);
+static bool
+tst_envelope_generate(const struct sieve_codegen_env *cgenv,
+		      struct sieve_command *ctx);
+
+static const struct sieve_command_def envelope_test = {
+	.identifier = "envelope",
+	.type = SCT_TEST,
+	.positional_args= 2,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = tst_envelope_registered,
+	.validate = tst_envelope_validate,
+	.generate = tst_envelope_generate
+};
+
+/*
+ * Envelope operation
+ */
+
+static bool
+ext_envelope_operation_dump(const struct sieve_dumptime_env *denv,
+			    sieve_size_t *address);
+static int
+ext_envelope_operation_execute(const struct sieve_runtime_env *renv,
+			       sieve_size_t *address);
+
+const struct sieve_operation_def envelope_operation = {
+	.mnemonic = "ENVELOPE",
+	.ext_def = &envelope_extension,
+	.dump = ext_envelope_operation_dump,
+	.execute = ext_envelope_operation_execute
+};
+
+/*
+ * Envelope parts
+ *
+ * FIXME: not available to extensions
+ */
+
+struct sieve_envelope_part {
+	const char *identifier;
+
+	const struct smtp_address *const *(*get_addresses)
+		(const struct sieve_runtime_env *renv);
+	const char * const *(*get_values)
+		(const struct sieve_runtime_env *renv);
+};
+
+static const struct smtp_address *const *
+_from_part_get_addresses(const struct sieve_runtime_env *renv);
+static const char *const *
+_from_part_get_values(const struct sieve_runtime_env *renv);
+static const struct smtp_address *const *
+_to_part_get_addresses(const struct sieve_runtime_env *renv);
+static const char *const *
+_to_part_get_values(const struct sieve_runtime_env *renv);
+static const char *const *
+_auth_part_get_values(const struct sieve_runtime_env *renv);
+
+static const struct sieve_envelope_part _from_part = {
+	"from",
+	_from_part_get_addresses,
+	_from_part_get_values,
+};
+
+static const struct sieve_envelope_part _to_part = {
+	"to",
+	_to_part_get_addresses,
+	_to_part_get_values,
+};
+
+static const struct sieve_envelope_part _auth_part = {
+	"auth",
+	NULL,
+	_auth_part_get_values,
+};
+
+static const struct sieve_envelope_part *_envelope_parts[] = {
+	/* Required */
+	&_from_part, &_to_part,
+
+	/* Non-standard */
+	&_auth_part
+};
+
+static unsigned int _envelope_part_count = N_ELEMENTS(_envelope_parts);
+
+static const struct sieve_envelope_part *
+_envelope_part_find(const char *identifier)
+{
+	unsigned int i;
+
+	for (i = 0; i < _envelope_part_count; i++) {
+		if (strcasecmp(_envelope_parts[i]->identifier,
+			       identifier) == 0)
+			return _envelope_parts[i];
+	}
+
+	return NULL;
+}
+
+/* Envelope parts implementation */
+
+static const struct smtp_address *const *
+_from_part_get_addresses(const struct sieve_runtime_env *renv)
+{
+	ARRAY(const struct smtp_address *) envelope_values;
+	const struct smtp_address *address =
+		sieve_message_get_sender(renv->msgctx);
+
+	t_array_init(&envelope_values, 2);
+
+	if (address == NULL)
+		address = smtp_address_create_temp(NULL, NULL);
+	array_append(&envelope_values, &address, 1);
+
+	(void)array_append_space(&envelope_values);
+	return array_idx(&envelope_values, 0);
+}
+
+static const char *const *
+_from_part_get_values(const struct sieve_runtime_env *renv)
+{
+	ARRAY(const char *)envelope_values;
+	const struct smtp_address *address =
+		sieve_message_get_sender(renv->msgctx);
+	const char *value;
+
+	t_array_init(&envelope_values, 2);
+
+	value = "";
+	if (!smtp_address_isnull(address))
+		value = smtp_address_encode(address);
+	array_append(&envelope_values, &value, 1);
+
+	(void)array_append_space(&envelope_values);
+
+	return array_idx(&envelope_values, 0);
+}
+
+static const struct smtp_address *const *
+_to_part_get_addresses(const struct sieve_runtime_env *renv)
+{
+	ARRAY(const struct smtp_address *) envelope_values;
+	const struct smtp_address *address =
+		sieve_message_get_orig_recipient(renv->msgctx);
+
+	if (address != NULL && address->localpart != NULL) {
+		t_array_init(&envelope_values, 2);
+
+		array_append(&envelope_values, &address, 1);
+
+		(void)array_append_space(&envelope_values);
+		return array_idx(&envelope_values, 0);
+	}
+	return NULL;
+}
+
+static const char *const *
+_to_part_get_values(const struct sieve_runtime_env *renv)
+{
+	ARRAY(const char *) envelope_values;
+	const struct smtp_address *address =
+		sieve_message_get_orig_recipient(renv->msgctx);
+
+	t_array_init(&envelope_values, 2);
+
+	if (address != NULL && address->localpart != NULL) {
+		const char *value = smtp_address_encode(address);
+		array_append(&envelope_values, &value, 1);
+	}
+
+	(void)array_append_space(&envelope_values);
+
+	return array_idx(&envelope_values, 0);
+}
+
+static const char *const *
+_auth_part_get_values(const struct sieve_runtime_env *renv)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	ARRAY(const char *) envelope_values;
+
+	t_array_init(&envelope_values, 2);
+
+	if (eenv->msgdata->auth_user != NULL)
+		array_append(&envelope_values, &eenv->msgdata->auth_user, 1);
+
+	(void)array_append_space(&envelope_values);
+
+	return array_idx(&envelope_values, 0);
+}
+
+/*
+ * Envelope address list
+ */
+
+/* Forward declarations */
+
+static int
+sieve_envelope_address_list_next_string_item(struct sieve_stringlist *_strlist,
+					     string_t **str_r);
+static int
+sieve_envelope_address_list_next_item(struct sieve_address_list *_addrlist,
+				      struct smtp_address *addr_r,
+				      string_t **unparsed_r);
+static void
+sieve_envelope_address_list_reset(struct sieve_stringlist *_strlist);
+
+/* Stringlist object */
+
+struct sieve_envelope_address_list {
+	struct sieve_address_list addrlist;
+
+	struct sieve_stringlist *env_parts;
+
+	const struct smtp_address *const *cur_addresses;
+	const char * const *cur_values;
+
+	int value_index;
+};
+
+static struct sieve_address_list *
+sieve_envelope_address_list_create(const struct sieve_runtime_env *renv,
+				   struct sieve_stringlist *env_parts)
+{
+	struct sieve_envelope_address_list *addrlist;
+
+	addrlist = t_new(struct sieve_envelope_address_list, 1);
+	addrlist->addrlist.strlist.runenv = renv;
+	addrlist->addrlist.strlist.exec_status = SIEVE_EXEC_OK;
+	addrlist->addrlist.strlist.next_item =
+		sieve_envelope_address_list_next_string_item;
+	addrlist->addrlist.strlist.reset = sieve_envelope_address_list_reset;
+	addrlist->addrlist.next_item = sieve_envelope_address_list_next_item;
+	addrlist->env_parts = env_parts;
+
+	return &addrlist->addrlist;
+}
+
+static int
+sieve_envelope_address_list_next_item(struct sieve_address_list *_addrlist,
+				      struct smtp_address *addr_r,
+				      string_t **unparsed_r)
+{
+	struct sieve_envelope_address_list *addrlist =
+		(struct sieve_envelope_address_list *)_addrlist;
+	const struct sieve_runtime_env *renv = _addrlist->strlist.runenv;
+
+	if (addr_r != NULL)
+		smtp_address_init(addr_r, NULL, NULL);
+	if (unparsed_r != NULL) *unparsed_r = NULL;
+
+	while (addrlist->cur_addresses == NULL &&
+	       addrlist->cur_values == NULL) {
+		const struct sieve_envelope_part *epart;
+		string_t *envp_item = NULL;
+		int ret;
+
+		/* Read next header value from source list */
+		if ((ret = sieve_stringlist_next_item(addrlist->env_parts,
+						      &envp_item)) <= 0)
+			return ret;
+
+		if (_addrlist->strlist.trace) {
+			sieve_runtime_trace(
+				_addrlist->strlist.runenv, 0,
+				"getting `%s' part from message envelope",
+				str_sanitize(str_c(envp_item), 80));
+		}
+
+		if ((epart=_envelope_part_find(str_c(envp_item))) != NULL) {
+			addrlist->value_index = 0;
+
+			if (epart->get_addresses != NULL) {
+				/* Field contains addresses */
+				addrlist->cur_addresses =
+					epart->get_addresses(renv);
+
+				/* Drop empty list */
+				if (addrlist->cur_addresses != NULL &&
+				    addrlist->cur_addresses[0] == NULL)
+					addrlist->cur_addresses = NULL;
+			}
+
+			if (addrlist->cur_addresses == NULL &&
+			    epart->get_values != NULL) {
+				/* Field contains something else */
+				addrlist->cur_values = epart->get_values(renv);
+
+				/* Drop empty list */
+				if (addrlist->cur_values != NULL &&
+				    addrlist->cur_values[0] == NULL)
+					addrlist->cur_values = NULL;
+			}
+		}
+	}
+
+	/* Return next item */
+	if (addrlist->cur_addresses != NULL) {
+		const struct smtp_address *addr =
+			addrlist->cur_addresses[addrlist->value_index];
+
+		if (addr->localpart == NULL) {
+			/* Null path <> */
+			if (unparsed_r != NULL)
+				*unparsed_r = t_str_new_const("", 0);
+		} else {
+			if (addr_r != NULL)
+				*addr_r = *addr;
+		}
+
+		/* Advance to next value */
+		addrlist->value_index++;
+		if (addrlist->cur_addresses[addrlist->value_index] == NULL) {
+			addrlist->cur_addresses = NULL;
+			addrlist->value_index = 0;
+		}
+	} else {
+		if (unparsed_r != NULL) {
+			const char *value =
+				addrlist->cur_values[addrlist->value_index];
+
+			*unparsed_r = t_str_new_const(value, strlen(value));
+		}
+
+		/* Advance to next value */
+		addrlist->value_index++;
+		if (addrlist->cur_values[addrlist->value_index] == NULL) {
+			addrlist->cur_values = NULL;
+			addrlist->value_index = 0;
+		}
+	}
+
+	return 1;
+}
+
+static int
+sieve_envelope_address_list_next_string_item(struct sieve_stringlist *_strlist,
+					     string_t **str_r)
+{
+	struct sieve_address_list *addrlist =
+		(struct sieve_address_list *)_strlist;
+	struct smtp_address addr;
+	int ret;
+
+	if ((ret=sieve_envelope_address_list_next_item(addrlist, &addr,
+						       str_r)) <= 0)
+		return ret;
+
+	if (addr.localpart != NULL) {
+		const char *addr_str = smtp_address_encode(&addr);
+		if (str_r != NULL)
+			*str_r = t_str_new_const(addr_str, strlen(addr_str));
+	}
+	return 1;
+}
+
+static void
+sieve_envelope_address_list_reset(struct sieve_stringlist *_strlist)
+{
+	struct sieve_envelope_address_list *addrlist =
+		(struct sieve_envelope_address_list *)_strlist;
+
+	sieve_stringlist_reset(addrlist->env_parts);
+	addrlist->cur_addresses = NULL;
+	addrlist->cur_values = NULL;
+	addrlist->value_index = 0;
+}
+
+/*
+ * Command Registration
+ */
+
+static bool
+tst_envelope_registered(struct sieve_validator *valdtr,
+			const struct sieve_extension *ext ATTR_UNUSED,
+			struct sieve_command_registration *cmd_reg)
+{
+	/* The order of these is not significant */
+	sieve_comparators_link_tag(valdtr, cmd_reg, SIEVE_MATCH_OPT_COMPARATOR);
+	sieve_match_types_link_tags(valdtr, cmd_reg, SIEVE_MATCH_OPT_MATCH_TYPE);
+	sieve_address_parts_link_tags(valdtr, cmd_reg, SIEVE_AM_OPT_ADDRESS_PART);
+	return TRUE;
+}
+
+/*
+ * Validation
+ */
+
+static int
+_envelope_part_is_supported(void *context, struct sieve_ast_argument *arg)
+{
+	const struct sieve_envelope_part **not_address =
+		(const struct sieve_envelope_part **) context;
+
+	if (sieve_argument_is_string_literal(arg)) {
+		const struct sieve_envelope_part *epart;
+
+		if ((epart=_envelope_part_find(
+			sieve_ast_strlist_strc(arg))) != NULL) {
+			if (epart->get_addresses == NULL) {
+				if (*not_address == NULL)
+					*not_address = epart;
+			}
+			return 1;
+		}
+		return 0;
+	}
+	return 1; /* Can't check at compile time */
+}
+
+static bool
+tst_envelope_validate(struct sieve_validator *valdtr, struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+	struct sieve_ast_argument *epart;
+	struct sieve_comparator cmp_default =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+	struct sieve_match_type mcht_default =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	const struct sieve_envelope_part *not_address = NULL;
+
+	if (!sieve_validate_positional_argument(valdtr, tst, arg,
+						"envelope part", 1,
+						SAAT_STRING_LIST)) {
+		return FALSE;
+	}
+
+	if (!sieve_validator_argument_activate(valdtr, tst, arg, FALSE))
+		return FALSE;
+
+	/* Check whether supplied envelope parts are supported
+	 *   FIXME: verify dynamic envelope parts at runtime
+	 */
+	epart = arg;
+	if (sieve_ast_stringlist_map(&epart, (void *) &not_address,
+				     _envelope_part_is_supported) <= 0) {
+		i_assert(epart != NULL);
+		sieve_argument_validate_error(
+			valdtr, epart,
+			"specified envelope part '%s' is not supported by the envelope test",
+			str_sanitize(sieve_ast_strlist_strc(epart), 64));
+		return FALSE;
+	}
+
+	if (not_address != NULL) {
+		struct sieve_ast_argument *addrp_arg =
+			sieve_command_find_argument(tst, &address_part_tag);
+
+		if (addrp_arg != NULL) {
+			sieve_argument_validate_error(
+				valdtr, addrp_arg,
+				"address part ':%s' specified while non-address envelope part '%s' "
+				"is tested with the envelope test",
+			sieve_ast_argument_tag(addrp_arg),
+					       not_address->identifier);
+			return FALSE;
+		}
+	}
+
+	arg = sieve_ast_argument_next(arg);
+
+	if (!sieve_validate_positional_argument(valdtr, tst, arg, "key list", 2,
+						SAAT_STRING_LIST))
+		return FALSE;
+
+	if (!sieve_validator_argument_activate(valdtr, tst, arg, FALSE))
+		return FALSE;
+
+	/* Validate the key argument to a specified match type */
+	return sieve_match_type_validate(valdtr, tst, arg,
+					 &mcht_default, &cmp_default);
+}
+
+/*
+ * Code generation
+ */
+
+static bool
+tst_envelope_generate(const struct sieve_codegen_env *cgenv,
+		      struct sieve_command *cmd)
+{
+	(void)sieve_operation_emit(cgenv->sblock, cmd->ext,
+				   &envelope_operation);
+
+	/* Generate arguments */
+	if (!sieve_generate_arguments(cgenv, cmd, NULL))
+		return FALSE;
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+ext_envelope_operation_dump(const struct sieve_dumptime_env *denv,
+			    sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "ENVELOPE");
+	sieve_code_descend(denv);
+
+	/* Handle any optional arguments */
+	if (sieve_addrmatch_opr_optional_dump(denv, address, NULL) != 0)
+		return FALSE;
+
+	return (sieve_opr_stringlist_dump(denv, address, "envelope part") &&
+		sieve_opr_stringlist_dump(denv, address, "key list"));
+}
+
+/*
+ * Interpretation
+ */
+
+static int
+ext_envelope_operation_execute(const struct sieve_runtime_env *renv,
+			       sieve_size_t *address)
+{
+	struct sieve_comparator cmp =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+	struct sieve_match_type mcht =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	struct sieve_address_part addrp =
+		SIEVE_ADDRESS_PART_DEFAULT(all_address_part);
+	struct sieve_stringlist *env_part_list, *value_list, *key_list;
+	struct sieve_address_list *addr_list;
+	int match, ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Read optional operands */
+	if (sieve_addrmatch_opr_optional_read(renv, address, NULL, &ret,
+					      &addrp, &mcht, &cmp) < 0)
+		return ret;
+
+	/* Read envelope-part */
+	if ((ret = sieve_opr_stringlist_read(renv, address, "envelope-part",
+					     &env_part_list)) <= 0)
+		return ret;
+
+	/* Read key-list */
+	if ((ret = sieve_opr_stringlist_read(renv, address, "key-list",
+					     &key_list)) <= 0)
+		return ret;
+
+	/*
+	 * Perform test
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS, "envelope test");
+
+	/* Create value stringlist */
+	addr_list = sieve_envelope_address_list_create(renv, env_part_list);
+	value_list = sieve_address_part_stringlist_create(renv, &addrp,
+							  addr_list);
+
+	/* Perform match */
+	if ((match = sieve_match(renv, &mcht, &cmp,
+				 value_list, key_list, &ret)) < 0)
+		return ret;
+
+	/* Set test result for subsequent conditional jump */
+	sieve_interpreter_set_test_result(renv->interp, match > 0);
+	return SIEVE_EXEC_OK;
+}
+
diff --git a/pigeonhole/src/lib-sieve/ext-fileinto.c b/pigeonhole/src/lib-sieve/ext-fileinto.c
new file mode 100644
index 0000000..fb65758
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/ext-fileinto.c
@@ -0,0 +1,225 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension fileinto
+ * ------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 5228
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+#include "unichar.h"
+
+#include "sieve-common.h"
+#include "sieve-extensions.h"
+#include "sieve-binary.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-message.h"
+#include "sieve-actions.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-result.h"
+
+/*
+ * Forward declarations
+ */
+
+static const struct sieve_command_def fileinto_command;
+const struct sieve_operation_def fileinto_operation;
+const struct sieve_extension_def fileinto_extension;
+
+/*
+ * Extension
+ */
+
+static bool
+ext_fileinto_validator_load(const struct sieve_extension *ext,
+			    struct sieve_validator *valdtr);
+
+const struct sieve_extension_def fileinto_extension = {
+	.name = "fileinto",
+	.validator_load = ext_fileinto_validator_load,
+	SIEVE_EXT_DEFINE_OPERATION(fileinto_operation),
+};
+
+static bool
+ext_fileinto_validator_load(const struct sieve_extension *ext,
+			    struct sieve_validator *valdtr)
+{
+	/* Register new command */
+	sieve_validator_register_command(valdtr, ext, &fileinto_command);
+
+	return TRUE;
+}
+
+/*
+ * Fileinto command
+ *
+ * Syntax:
+ *   fileinto <folder: string>
+ */
+
+static bool
+cmd_fileinto_validate(struct sieve_validator *valdtr,
+		      struct sieve_command *cmd);
+static bool
+cmd_fileinto_generate(const struct sieve_codegen_env *cgenv,
+		      struct sieve_command *ctx);
+
+static const struct sieve_command_def fileinto_command = {
+	.identifier = "fileinto",
+	.type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = cmd_fileinto_validate,
+	.generate = cmd_fileinto_generate,
+};
+
+/*
+ * Fileinto operation
+ */
+
+static bool
+ext_fileinto_operation_dump(const struct sieve_dumptime_env *denv,
+			    sieve_size_t *address);
+static int
+ext_fileinto_operation_execute(const struct sieve_runtime_env *renv,
+			       sieve_size_t *address);
+
+const struct sieve_operation_def fileinto_operation = {
+	.mnemonic = "FILEINTO",
+	.ext_def = &fileinto_extension,
+	.dump = ext_fileinto_operation_dump,
+	.execute = ext_fileinto_operation_execute,
+};
+
+/*
+ * Validation
+ */
+
+static bool
+cmd_fileinto_validate(struct sieve_validator *valdtr, struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg = cmd->first_positional;
+
+	if (!sieve_validate_positional_argument(valdtr, cmd, arg, "folder",
+						1, SAAT_STRING))
+		return FALSE;
+
+	if (!sieve_validator_argument_activate(valdtr, cmd, arg, FALSE))
+		return FALSE;
+
+	/* Check name validity when folder argument is not a variable */
+	if (sieve_argument_is_string_literal(arg)) {
+		const char *folder = sieve_ast_argument_strc(arg), *error;
+
+		if (!sieve_mailbox_check_name(folder, &error)) {
+			sieve_command_validate_error(
+				valdtr, cmd, "fileinto command: "
+				"invalid folder name `%s' specified: %s",
+				str_sanitize(folder, 256), error);
+			return FALSE;
+		}
+	}
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool
+cmd_fileinto_generate(const struct sieve_codegen_env *cgenv,
+		      struct sieve_command *cmd)
+{
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &fileinto_operation);
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, cmd, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+ext_fileinto_operation_dump(const struct sieve_dumptime_env *denv,
+			    sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "FILEINTO");
+	sieve_code_descend(denv);
+
+	if (sieve_action_opr_optional_dump(denv, address, NULL) != 0)
+		return FALSE;
+
+	return sieve_opr_string_dump(denv, address, "folder");
+}
+
+/*
+ * Execution
+ */
+
+static int
+ext_fileinto_operation_execute(const struct sieve_runtime_env *renv,
+			       sieve_size_t *address)
+{
+	struct sieve_side_effects_list *slist = NULL;
+	string_t *folder;
+	const char *error;
+	bool trace = sieve_runtime_trace_active(renv, SIEVE_TRLVL_ACTIONS);
+	int ret = 0;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Optional operands (side effects only) */
+	if (sieve_action_opr_optional_read(renv, address, NULL,
+					   &ret, &slist) != 0)
+		return ret;
+
+	/* Folder operand */
+	ret = sieve_opr_string_read(renv, address, "folder", &folder);
+	if (ret <= 0)
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	if (trace) {
+		sieve_runtime_trace(renv, 0, "fileinto action");
+		sieve_runtime_trace_descend(renv);
+	}
+
+	if (!sieve_mailbox_check_name(str_c(folder), &error)) {
+		sieve_runtime_error(
+			renv, NULL, "fileinto command: "
+			"invalid folder name `%s' specified: %s",
+			str_c(folder), error);
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	if (trace) {
+		sieve_runtime_trace(renv, 0, "store message in mailbox `%s'",
+				    str_sanitize(str_c(folder), 80));
+	}
+
+	/* Add action to result */
+	if (sieve_act_store_add_to_result(renv, "fileinto", slist,
+					  str_c(folder)) < 0)
+		return SIEVE_EXEC_FAILURE;
+
+	sieve_message_snapshot(renv->msgctx);
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/ext-reject.c b/pigeonhole/src/lib-sieve/ext-reject.c
new file mode 100644
index 0000000..649c1f2
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/ext-reject.c
@@ -0,0 +1,606 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension reject
+ * ----------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 5429
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "hostpid.h"
+#include "str-sanitize.h"
+#include "message-date.h"
+#include "message-size.h"
+#include "istream.h"
+#include "istream-header-filter.h"
+
+#include "rfc2822.h"
+
+#include "sieve-common.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-actions.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-binary.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-result.h"
+#include "sieve-message.h"
+#include "sieve-smtp.h"
+
+/*
+ * Forward declarations
+ */
+
+static const struct sieve_command_def reject_command;
+static const struct sieve_operation_def reject_operation;
+
+static const struct sieve_command_def ereject_command;
+static const struct sieve_operation_def ereject_operation;
+
+/*
+ * Extensions
+ */
+
+static bool
+ext_reject_validator_validate(const struct sieve_extension *ext,
+			      struct sieve_validator *valdtr, void *context,
+			      struct sieve_ast_argument *require_arg,
+			      bool required);
+static int
+ext_reject_interpreter_run(const struct sieve_extension *this_ext,
+			   const struct sieve_runtime_env *renv,
+			   void *context, bool deferred);
+
+/* Reject */
+
+static bool
+ext_reject_validator_load(const struct sieve_extension *ext,
+			  struct sieve_validator *valdtr);
+static bool
+ext_reject_interpreter_load(const struct sieve_extension *ext,
+			    const struct sieve_runtime_env *renv,
+			    sieve_size_t *address);
+
+const struct sieve_extension_def reject_extension = {
+	.name = "reject",
+	.validator_load = ext_reject_validator_load,
+	.interpreter_load = ext_reject_interpreter_load,
+	SIEVE_EXT_DEFINE_OPERATION(reject_operation)
+};
+const struct sieve_validator_extension
+reject_validator_extension = {
+	.ext = &reject_extension,
+	.validate = ext_reject_validator_validate
+};
+const struct sieve_interpreter_extension
+reject_interpreter_extension = {
+	.ext_def = &reject_extension,
+	.run = ext_reject_interpreter_run
+};
+
+static bool
+ext_reject_validator_load(const struct sieve_extension *ext,
+			  struct sieve_validator *valdtr)
+{
+	/* Register new command */
+	sieve_validator_register_command(valdtr, ext, &reject_command);
+
+	sieve_validator_extension_register(valdtr, ext,
+					   &reject_validator_extension, NULL);
+	return TRUE;
+}
+
+static bool
+ext_reject_interpreter_load(const struct sieve_extension *ext,
+			    const struct sieve_runtime_env *renv,
+			    sieve_size_t *address ATTR_UNUSED)
+{
+	sieve_interpreter_extension_register(renv->interp, ext,
+					     &reject_interpreter_extension,
+					     NULL);
+	return TRUE;
+}
+
+/* EReject */
+
+static bool
+ext_ereject_validator_load(const struct sieve_extension *ext,
+			   struct sieve_validator *valdtr);
+static bool
+ext_ereject_interpreter_load(const struct sieve_extension *ext,
+			     const struct sieve_runtime_env *renv,
+			     sieve_size_t *address);
+
+const struct sieve_extension_def ereject_extension = {
+	.name = "ereject",
+	.validator_load = ext_ereject_validator_load,
+	.interpreter_load = ext_ereject_interpreter_load,
+	SIEVE_EXT_DEFINE_OPERATION(ereject_operation)
+};
+const struct sieve_validator_extension
+ereject_validator_extension = {
+	.ext = &ereject_extension,
+	.validate = ext_reject_validator_validate
+};
+const struct sieve_interpreter_extension
+ereject_interpreter_extension = {
+	.ext_def = &ereject_extension,
+	.run = ext_reject_interpreter_run
+};
+
+static bool
+ext_ereject_validator_load(const struct sieve_extension *ext,
+			   struct sieve_validator *valdtr)
+{
+	/* Register new command */
+	sieve_validator_register_command(valdtr, ext, &ereject_command);
+
+	sieve_validator_extension_register(valdtr, ext,
+					   &ereject_validator_extension, NULL);
+	return TRUE;
+}
+
+static bool
+ext_ereject_interpreter_load(const struct sieve_extension *ext,
+			     const struct sieve_runtime_env *renv,
+			     sieve_size_t *address ATTR_UNUSED)
+{
+	sieve_interpreter_extension_register(renv->interp, ext,
+					     &ereject_interpreter_extension,
+					     NULL);
+	return TRUE;
+}
+
+/* Environment checking */
+
+static bool
+ext_reject_validator_validate(const struct sieve_extension *ext,
+			      struct sieve_validator *valdtr,
+			      void *context ATTR_UNUSED,
+			      struct sieve_ast_argument *require_arg,
+			      bool required)
+{
+	if (required) {
+		enum sieve_compile_flags flags =
+			sieve_validator_compile_flags(valdtr);
+
+		if ((flags & SIEVE_COMPILE_FLAG_NO_ENVELOPE) != 0) {
+			sieve_argument_validate_error(
+				valdtr, require_arg,
+				"the %s extension cannot be used in this context "
+				"(needs access to message envelope)",
+				sieve_extension_name(ext));
+			return FALSE;
+		}
+	}
+	return TRUE;
+}
+
+static int
+ext_reject_interpreter_run(const struct sieve_extension *ext,
+			   const struct sieve_runtime_env *renv,
+			   void *context ATTR_UNUSED, bool deferred)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+
+	if ((eenv->flags & SIEVE_EXECUTE_FLAG_NO_ENVELOPE) != 0) {
+		if (!deferred) {
+			sieve_runtime_error(
+				renv, NULL,
+				"the %s extension cannot be used in this context "
+				"(needs access to message envelope)",
+				sieve_extension_name(ext));
+		}
+		return SIEVE_EXEC_FAILURE;
+	}
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Commands
+ */
+
+/* Forward declarations */
+
+static bool
+cmd_reject_validate(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool
+cmd_reject_generate(const struct sieve_codegen_env *cgenv,
+		    struct sieve_command *cmd);
+
+/* Reject command
+ *
+ * Syntax:
+ *   reject <reason: string>
+ */
+
+static const struct sieve_command_def reject_command = {
+	.identifier = "reject",
+	.type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = cmd_reject_validate,
+	.generate = cmd_reject_generate
+};
+
+/* EReject command
+ *
+ * Syntax:
+ *   ereject <reason: string>
+ */
+
+static const struct sieve_command_def ereject_command = {
+	.identifier = "ereject",
+	.type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = cmd_reject_validate,
+	.generate = cmd_reject_generate,
+};
+
+/*
+ * Operations
+ */
+
+/* Forward declarations */
+
+static bool
+ext_reject_operation_dump(const struct sieve_dumptime_env *denv,
+			  sieve_size_t *address);
+static int
+ext_reject_operation_execute(const struct sieve_runtime_env *renv,
+			     sieve_size_t *address);
+
+/* Reject operation */
+
+static const struct sieve_operation_def reject_operation = {
+	.mnemonic = "REJECT",
+	.ext_def = &reject_extension,
+	.dump = ext_reject_operation_dump,
+	.execute = ext_reject_operation_execute
+};
+
+/* EReject operation */
+
+static const struct sieve_operation_def ereject_operation = {
+	.mnemonic = "EREJECT",
+	.ext_def = &ereject_extension,
+	.dump = ext_reject_operation_dump,
+	.execute = ext_reject_operation_execute
+};
+
+/*
+ * Reject action
+ */
+
+static int
+act_reject_check_duplicate(const struct sieve_runtime_env *renv,
+			   const struct sieve_action *act,
+			   const struct sieve_action *act_other);
+int act_reject_check_conflict(const struct sieve_runtime_env *renv,
+			      const struct sieve_action *act,
+			      const struct sieve_action *act_other);
+static void
+act_reject_print(const struct sieve_action *action,
+		 const struct sieve_result_print_env *rpenv, bool *keep);
+static int
+act_reject_start(const struct sieve_action_exec_env *aenv, void **tr_context);
+static int
+act_reject_execute(const struct sieve_action_exec_env *aenv, void *tr_context,
+		   bool *keep);
+static int
+act_reject_commit(const struct sieve_action_exec_env *aenv, void *tr_context);
+
+const struct sieve_action_def act_reject = {
+	.name = "reject",
+	.flags = SIEVE_ACTFLAG_SENDS_RESPONSE,
+	.check_duplicate = act_reject_check_duplicate,
+	.check_conflict = act_reject_check_conflict,
+	.print = act_reject_print,
+	.start = act_reject_start,
+	.execute = act_reject_execute,
+	.commit = act_reject_commit,
+};
+
+struct act_reject_context {
+	const char *reason;
+	bool ereject;
+};
+
+/*
+ * Validation
+ */
+
+static bool
+cmd_reject_validate(struct sieve_validator *valdtr, struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg = cmd->first_positional;
+
+	if (!sieve_validate_positional_argument(valdtr, cmd, arg, "reason",
+						1, SAAT_STRING))
+		return FALSE;
+
+	return sieve_validator_argument_activate(valdtr, cmd, arg, FALSE);
+}
+
+/*
+ * Code generation
+ */
+
+static bool
+cmd_reject_generate(const struct sieve_codegen_env *cgenv,
+		    struct sieve_command *cmd)
+{
+	if (sieve_command_is(cmd, reject_command)) {
+		sieve_operation_emit(cgenv->sblock, cmd->ext,
+				     &reject_operation);
+	} else {
+		sieve_operation_emit(cgenv->sblock, cmd->ext,
+				     &ereject_operation);
+	}
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, cmd, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+ext_reject_operation_dump(const struct sieve_dumptime_env *denv,
+			  sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "%s", sieve_operation_mnemonic(denv->oprtn));
+	sieve_code_descend(denv);
+
+	if (sieve_action_opr_optional_dump(denv, address, NULL) != 0)
+		return FALSE;
+
+	return sieve_opr_string_dump(denv, address, "reason");
+}
+
+/*
+ * Interpretation
+ */
+
+static int
+ext_reject_operation_execute(const struct sieve_runtime_env *renv,
+			     sieve_size_t *address)
+{
+	const struct sieve_operation *oprtn = renv->oprtn;
+	const struct sieve_extension *this_ext = oprtn->ext;
+	struct sieve_side_effects_list *slist = NULL;
+	struct act_reject_context *act;
+	string_t *reason;
+	pool_t pool;
+	int ret;
+
+	/*
+	 * Read data
+	 */
+
+	/* Optional operands (side effects only) */
+	if (sieve_action_opr_optional_read(renv, address, NULL,
+					   &ret, &slist) != 0)
+		return ret;
+
+	/* Read rejection reason */
+	if ((ret = sieve_opr_string_read(renv, address, "reason",
+					 &reason)) <= 0)
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_ACTIONS)) {
+		if (sieve_operation_is(oprtn, ereject_operation))
+			sieve_runtime_trace(renv, 0, "ereject action");
+		else
+			sieve_runtime_trace(renv, 0, "reject action");
+
+		sieve_runtime_trace_descend(renv);
+		sieve_runtime_trace(renv, 0, "reject message with reason `%s'",
+				    str_sanitize(str_c(reason), 64));
+	}
+
+	/* Add reject action to the result */
+	pool = sieve_result_pool(renv->result);
+	act = p_new(pool, struct act_reject_context, 1);
+	act->reason = p_strdup(pool, str_c(reason));
+	act->ereject = sieve_operation_is(oprtn, ereject_operation);
+
+	if (sieve_result_add_action(renv, this_ext,
+				    (act->ereject ? "ereject" : "reject"),
+				    &act_reject, slist, (void *)act,
+				    0, FALSE) < 0)
+		return SIEVE_EXEC_FAILURE;
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Action implementation
+ */
+
+struct act_reject_transaction {
+	bool ignore_reject:1;
+};
+
+static int
+act_reject_check_duplicate(const struct sieve_runtime_env *renv ATTR_UNUSED,
+			   const struct sieve_action *act,
+			   const struct sieve_action *act_other)
+{
+	if (!sieve_action_is_executed(act_other, renv->result)) {
+		sieve_runtime_error(
+			renv, act->location,
+			"duplicate reject/ereject action not allowed "
+			"(previously triggered one was here: %s)",
+			act_other->location);
+		return -1;
+	}
+
+	return 1;
+}
+
+int act_reject_check_conflict(const struct sieve_runtime_env *renv,
+			      const struct sieve_action *act,
+			      const struct sieve_action *act_other)
+{
+	if ((act_other->def->flags & SIEVE_ACTFLAG_TRIES_DELIVER) > 0) {
+		if (!sieve_action_is_executed(act_other, renv->result)) {
+			sieve_runtime_error(
+				renv, act->location,
+				"reject/ereject action conflicts with other action: "
+				"the %s action (%s) tries to deliver the message",
+				act_other->def->name, act_other->location);
+			return -1;
+		}
+	}
+
+	if ((act_other->def->flags & SIEVE_ACTFLAG_SENDS_RESPONSE) > 0) {
+		struct act_reject_context *rj_ctx;
+
+		if (!sieve_action_is_executed(act_other, renv->result)) {
+			sieve_runtime_error(
+				renv, act->location,
+				"reject/ereject action conflicts with other action: "
+				"the %s action (%s) also sends a response to the sender",
+				act_other->def->name, act_other->location);
+			return -1;
+		}
+
+		/* Conflicting action was already executed, transform reject
+		 * into discard equivalent.
+		 */
+		rj_ctx = (struct act_reject_context *)act->context;
+		rj_ctx->reason = NULL;
+	}
+
+	return 0;
+}
+
+static void
+act_reject_print(const struct sieve_action *action,
+		 const struct sieve_result_print_env *rpenv, bool *keep)
+{
+	struct act_reject_context *rj_ctx =
+		(struct act_reject_context *)action->context;
+
+	if (rj_ctx->reason != NULL) {
+		sieve_result_action_printf(
+			rpenv, "reject message with reason: %s",
+			str_sanitize(rj_ctx->reason, 128));
+	} else {
+		sieve_result_action_printf(
+			rpenv,
+			"reject message without sending a response (discard)");
+	}
+
+	*keep = FALSE;
+}
+
+static int
+act_reject_start(const struct sieve_action_exec_env *aenv, void **tr_context)
+{
+	struct act_reject_transaction *trans;
+	pool_t pool = sieve_result_pool(aenv->result);
+
+	/* Create transaction context */
+	trans = p_new(pool, struct act_reject_transaction, 1);
+	*tr_context = trans;
+
+	return SIEVE_EXEC_OK;
+}
+
+static int
+act_reject_execute(const struct sieve_action_exec_env *aenv,
+		   void *tr_context, bool *keep)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct act_reject_context *rj_ctx =
+		(struct act_reject_context *)aenv->action->context;
+	struct act_reject_transaction *trans = tr_context;
+	const struct smtp_address *sender, *recipient;
+
+	sender = sieve_message_get_sender(aenv->msgctx);
+	recipient = sieve_message_get_orig_recipient(aenv->msgctx);
+
+	if ((eenv->flags & SIEVE_EXECUTE_FLAG_SKIP_RESPONSES) != 0) {
+		sieve_result_global_log(
+			aenv, "not sending reject message (skipped)");
+		trans->ignore_reject = TRUE;
+		return SIEVE_EXEC_OK;
+	}
+	if (smtp_address_isnull(recipient)) {
+		sieve_result_global_warning(
+			aenv, "reject action aborted: envelope recipient is <>");
+		trans->ignore_reject = TRUE;
+		return SIEVE_EXEC_OK;
+	}
+	if (rj_ctx->reason == NULL) {
+		sieve_result_global_log(
+			aenv, "not sending reject message "
+			"(would cause second response to sender)");
+		trans->ignore_reject = TRUE;
+		*keep = FALSE;
+		return SIEVE_EXEC_OK;
+	}
+	if (smtp_address_isnull(sender)) {
+		sieve_result_global_log(
+			aenv, "not sending reject message to <>");
+		trans->ignore_reject = TRUE;
+		*keep = FALSE;
+		return SIEVE_EXEC_OK;
+	}
+
+	*keep = FALSE;
+	return SIEVE_EXEC_OK;
+}
+
+static int
+act_reject_commit(const struct sieve_action_exec_env *aenv,
+		  void *tr_context ATTR_UNUSED)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct act_reject_context *rj_ctx =
+		(struct act_reject_context *)aenv->action->context;
+	struct act_reject_transaction *trans = tr_context;
+	const struct smtp_address *sender, *recipient;
+	int ret;
+
+	sender = sieve_message_get_sender(aenv->msgctx);
+	recipient = sieve_message_get_orig_recipient(aenv->msgctx);
+
+	if (trans->ignore_reject)
+		return SIEVE_EXEC_OK;
+
+	if ((ret = sieve_action_reject_mail(aenv, recipient,
+					    rj_ctx->reason)) <= 0)
+		return ret;
+
+	eenv->exec_status->significant_action_executed = TRUE;
+
+	struct event_passthrough *e = sieve_action_create_finish_event(aenv);
+
+	sieve_result_event_log(aenv, e->event(),
+			       "rejected message from <%s> (%s)",
+			       smtp_address_encode(sender),
+			       (rj_ctx->ereject ? "ereject" : "reject"));
+
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/mcht-contains.c b/pigeonhole/src/lib-sieve/mcht-contains.c
new file mode 100644
index 0000000..a9b3190
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/mcht-contains.c
@@ -0,0 +1,66 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Match-type ':contains'
+ */
+
+#include "lib.h"
+
+#include "sieve-match-types.h"
+#include "sieve-comparators.h"
+#include "sieve-match.h"
+
+#include <string.h>
+#include <stdio.h>
+
+/*
+ * Forward declarations
+ */
+
+static int mcht_contains_match_key
+	(struct sieve_match_context *mctx, const char *val, size_t val_size,
+		const char *key, size_t key_size);
+
+/*
+ * Match-type object
+ */
+
+const struct sieve_match_type_def contains_match_type = {
+	SIEVE_OBJECT("contains",
+		&match_type_operand, SIEVE_MATCH_TYPE_CONTAINS),
+	.validate_context = sieve_match_substring_validate_context,
+	.match_key = mcht_contains_match_key
+};
+
+/*
+ * Match-type implementation
+ */
+
+/* FIXME: Naive substring match implementation. Should switch to more
+ * efficient algorithm if large values need to be searched (e.g. message body).
+ */
+static int mcht_contains_match_key
+(struct sieve_match_context *mctx, const char *val, size_t val_size,
+	const char *key, size_t key_size)
+{
+	const struct sieve_comparator *cmp = mctx->comparator;
+	const char *vend = (const char *) val + val_size;
+	const char *kend = (const char *) key + key_size;
+	const char *vp = val;
+	const char *kp = key;
+
+	if ( val_size == 0 )
+		return ( key_size == 0 ? 1 : 0 );
+
+	if ( cmp->def == NULL || cmp->def->char_match == NULL )
+		return 0;
+
+	while ( (vp < vend) && (kp < kend) ) {
+		if ( !cmp->def->char_match(cmp, &vp, vend, &kp, kend) )
+			vp++;
+	}
+
+	return ( kp == kend ? 1 : 0 );
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/mcht-is.c b/pigeonhole/src/lib-sieve/mcht-is.c
new file mode 100644
index 0000000..db374bb
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/mcht-is.c
@@ -0,0 +1,52 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Match-type ':is':
+ */
+
+#include "lib.h"
+
+#include "sieve-match-types.h"
+#include "sieve-comparators.h"
+#include "sieve-match.h"
+
+#include <string.h>
+#include <stdio.h>
+
+/*
+ * Forward declarations
+ */
+
+static int mcht_is_match_key
+	(struct sieve_match_context *mctx, const char *val, size_t val_size,
+		const char *key, size_t key_size);
+
+/*
+ * Match-type object
+ */
+
+const struct sieve_match_type_def is_match_type = {
+	SIEVE_OBJECT("is",
+		&match_type_operand, SIEVE_MATCH_TYPE_IS),
+	.match_key = mcht_is_match_key
+};
+
+/*
+ * Match-type implementation
+ */
+
+static int mcht_is_match_key
+(struct sieve_match_context *mctx ATTR_UNUSED,
+	const char *val, size_t val_size,
+	const char *key, size_t key_size)
+{
+	if ( val_size == 0 )
+		return ( key_size == 0 ? 1 : 0 );
+
+	if ( mctx->comparator->def != NULL && mctx->comparator->def->compare != NULL )
+		return (mctx->comparator->def->compare(mctx->comparator,
+			val, val_size, key, key_size) == 0 ? 1 : 0 );
+
+	return 0;
+}
+
diff --git a/pigeonhole/src/lib-sieve/mcht-matches.c b/pigeonhole/src/lib-sieve/mcht-matches.c
new file mode 100644
index 0000000..050fce9
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/mcht-matches.c
@@ -0,0 +1,440 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Match-type ':matches'
+ */
+
+#include "lib.h"
+#include "str.h"
+
+#include "sieve-match-types.h"
+#include "sieve-comparators.h"
+#include "sieve-match.h"
+
+#include <string.h>
+#include <stdio.h>
+
+/*
+ * Forward declarations
+ */
+
+static int mcht_matches_match_key
+	(struct sieve_match_context *mctx, const char *val, size_t val_size,
+		const char *key, size_t key_size);
+
+/*
+ * Match-type object
+ */
+
+const struct sieve_match_type_def matches_match_type = {
+	SIEVE_OBJECT("matches",
+		&match_type_operand, SIEVE_MATCH_TYPE_MATCHES),
+	.validate_context = sieve_match_substring_validate_context,
+	.match_key = mcht_matches_match_key
+};
+
+/*
+ * Match-type implementation
+ */
+
+/* Quick 'n dirty debug */
+//#define MATCH_DEBUG
+#ifdef MATCH_DEBUG
+#define debug_printf(...) printf ("match debug: " __VA_ARGS__)
+#else
+#define debug_printf(...)
+#endif
+
+/* FIXME: Naive implementation, substitute this with dovecot src/lib/str-find.c
+ */
+static inline bool _string_find(const struct sieve_comparator *cmp,
+	const char **valp, const char *vend, const char **keyp, const char *kend)
+{
+	while ( (*valp < vend) && (*keyp < kend) ) {
+		if ( !cmp->def->char_match(cmp, valp, vend, keyp, kend) )
+			(*valp)++;
+	}
+
+	return (*keyp == kend);
+}
+
+static char _scan_key_section
+	(string_t *section, const char **wcardp, const char *key_end)
+{
+	/* Find next wildcard and resolve escape sequences */
+	str_truncate(section, 0);
+	while ( *wcardp < key_end && **wcardp != '*' && **wcardp != '?') {
+		if ( **wcardp == '\\' ) {
+			(*wcardp)++;
+		}
+		str_append_c(section, **wcardp);
+		(*wcardp)++;
+	}
+
+	/* Record wildcard character or \0 */
+	if ( *wcardp < key_end ) {
+		return **wcardp;
+	}
+
+	i_assert( *wcardp == key_end );
+	return '\0';
+}
+
+static int mcht_matches_match_key
+(struct sieve_match_context *mctx, const char *val, size_t val_size,
+	const char *key, size_t key_size)
+{
+	const struct sieve_comparator *cmp = mctx->comparator;
+	struct sieve_match_values *mvalues;
+	string_t *mvalue = NULL, *mchars = NULL;
+	string_t *section, *subsection;
+	const char *vend, *kend, *vp, *kp, *wp, *pvp;
+	bool backtrack = FALSE; /* TRUE: match of '?'-connected sections failed */
+	char wcard = '\0';      /* Current wildcard */
+	char next_wcard = '\0'; /* Next  widlcard */
+	unsigned int key_offset = 0;
+
+	if ( cmp->def == NULL || cmp->def->char_match == NULL )
+		return 0;
+
+	/* Key sections */
+	section = t_str_new(32);    /* Section (after beginning or *) */
+	subsection = t_str_new(32); /* Sub-section (after ?) */
+
+	/* Mark end of value and key */
+	vend = (const char *) val + val_size;
+	kend = (const char *) key + key_size;
+
+	/* Initialize pointers */
+	vp = val;                   /* Value pointer */
+	kp = key;                   /* Key pointer */
+	wp = key;                   /* Wildcard (key) pointer */
+
+	/* Start match values list if requested */
+	if ( (mvalues = sieve_match_values_start(mctx->runenv)) != NULL ) {
+		/* Skip ${0} for now; added when match succeeds */
+		sieve_match_values_add(mvalues, NULL);
+
+		mvalue = t_str_new(32);     /* Match value (*) */
+		mchars = t_str_new(32);     /* Match characters (.?..?.??) */
+	}
+
+	/* Match the pattern:
+	 *   <pattern> = <section>*<section>*<section>...
+	 *   <section> = <sub-section>?<sub-section>?<sub-section>...
+	 *
+	 * Escape sequences \? and \* need special attention.
+	 */
+
+	debug_printf("=== Start ===\n");
+	debug_printf("  key:   %s\n", t_strdup_until(key, kend));
+	debug_printf("  value: %s\n", t_strdup_until(val, vend));
+
+	/* Loop until either key or value ends */
+	while (kp < kend && vp < vend ) {
+		const char *needle, *nend;
+
+		if ( !backtrack ) {
+			/* Search the next '*' wildcard in the key string */
+
+			wcard = next_wcard;
+
+			/* Find the needle to look for in the string */
+			key_offset = 0;
+			for (;;) {
+				next_wcard = _scan_key_section(section, &wp, kend);
+
+				if ( wcard == '\0' || str_len(section) > 0 )
+					break;
+
+				if ( next_wcard == '*' ) {
+					break;
+				}
+
+				if ( wp < kend )
+					wp++;
+				else
+					break;
+				key_offset++;
+			}
+
+			debug_printf("found wildcard '%c' at pos [%d]\n",
+				next_wcard, (int) (wp-key));
+
+			if ( mvalues != NULL )
+				str_truncate(mvalue, 0);
+		} else {
+			/* Backtracked; '*' wildcard is retained */
+			debug_printf("backtracked");
+			backtrack = FALSE;
+		}
+
+		/* Determine what we are looking for */
+		needle = str_c(section);
+		nend = PTR_OFFSET(needle, str_len(section));
+
+		debug_printf("  section needle:  '%s'\n", t_strdup_until(needle, nend));
+		debug_printf("  section key:     '%s'\n", t_strdup_until(kp, kend));
+		debug_printf("  section remnant: '%s'\n", t_strdup_until(wp, kend));
+		debug_printf("  value remnant:   '%s'\n", t_strdup_until(vp, vend));
+		debug_printf("  key offset:      %d\n", key_offset);
+
+		pvp = vp;
+		if ( next_wcard == '\0' ) {
+			if ( wcard == '\0' ) {
+				/* No current wildcard; match needs to happen right at the beginning */
+				debug_printf("next_wcard = NULL && wcard = NUL; needle should be equal to value.\n");
+
+				if ( (vend - vp) != (nend - needle) ||
+					!cmp->def->char_match(cmp, &vp, vend, &needle, nend) ) {
+					debug_printf("  key not equal to value\n");
+					break;
+				}
+
+			} else {
+				const char *qp, *qend;
+				size_t slen;
+
+				/* No more wildcards; find the needle substring at the end of string */
+				debug_printf("next_wcard = NUL; must find needle at end\n");
+
+				/* Check if the value is still large enough */
+				slen = str_len(section);
+				if ( (vp + slen) > vend ) {
+					debug_printf("  wont match: value is too short\n");
+					break;
+				}
+
+				/* Move value pointer to where the needle should be */
+				vp = vend - slen;
+
+				/* Record match values */
+				qend = vp;
+				qp = vp - key_offset;
+
+				if ( mvalues != NULL )
+					str_append_data(mvalue, pvp, qp-pvp);
+
+				/* Compare needle to end of value string */
+				if ( !cmp->def->char_match(cmp, &vp, vend, &needle, nend) ) {
+					debug_printf("  match at end failed\n");
+					break;
+				}
+
+				/* Add match values */
+				if ( mvalues != NULL ) {
+					/* Append '*' match value */
+					sieve_match_values_add(mvalues, mvalue);
+
+					/* Append any initial '?' match values */
+					for ( ; qp < qend; qp++ )
+						sieve_match_values_add_char(mvalues, *qp);
+				}
+			}
+
+			/* Finish match */
+			kp = kend;
+			vp = vend;
+
+			debug_printf("  matched end of value\n");
+			break;
+		} else {
+			/* Next wildcard found; match needle before next wildcard */
+
+			const char *prv = NULL; /* Stored value pointer for backtrack */
+			const char *prk = NULL; /* Stored key pointer for backtrack */
+			const char *prw = NULL; /* Stored wildcard pointer for backtrack */
+			const char *chars;
+
+			/* Reset '?' match values */
+			if ( mvalues != NULL )
+				str_truncate(mchars, 0);
+
+			if ( wcard == '\0' ) {
+				/* No current wildcard; match needs to happen right at the beginning */
+				debug_printf("wcard = NUL; needle should be found at the beginning.\n");
+				debug_printf("  begin needle: '%s'\n", t_strdup_until(needle, nend));
+				debug_printf("  begin value:  '%s'\n", t_strdup_until(vp, vend));
+
+				if ( !cmp->def->char_match(cmp, &vp, vend, &needle, nend) ) {
+					debug_printf("  failed to find needle at beginning\n");
+					break;
+				}
+
+			} else {
+				/* Current wildcard present; match needle between current and next wildcard */
+				debug_printf("wcard != NUL; must find needle at an offset (>= %d).\n",
+					key_offset);
+
+				/* Match may happen at any offset (>= key offset): find substring */
+				vp += key_offset;
+				if ( (vp >= vend) || !_string_find(cmp, &vp, vend, &needle, nend) ) {
+					debug_printf("  failed to find needle at an offset\n");
+					break;
+				}
+
+				prv = vp - str_len(section);
+				prk = kp;
+				prw = wp;
+
+				/* Append match values */
+				if ( mvalues != NULL ) {
+					const char *qend = vp - str_len(section);
+					const char *qp = qend - key_offset;
+
+					/* Append '*' match value */
+					str_append_data(mvalue, pvp, qp-pvp);
+
+					/* Append any initial '?' match values (those that caused the key
+					 * offset.
+					 */
+					for ( ; qp < qend; qp++ )
+						str_append_c(mchars, *qp);
+				}
+			}
+
+			/* Update wildcard and key pointers for next wildcard scan */
+			if ( wp < kend ) wp++;
+			kp = wp;
+
+			/* Scan successive '?' wildcards */
+			while ( next_wcard == '?' ) {
+				debug_printf("next_wcard = '?'; need to match arbitrary character\n");
+
+				/* Add match value */
+				if ( mvalues != NULL )
+					str_append_c(mchars, *vp);
+
+				vp++;
+
+				/* Scan for next '?' wildcard */
+				next_wcard = _scan_key_section(subsection, &wp, kend);
+				debug_printf("found next wildcard '%c' at pos [%d] (fixed match)\n",
+					next_wcard, (int) (wp-key));
+
+				/* Determine what we are looking for */
+				needle = str_c(subsection);
+				nend = needle + str_len(subsection);
+
+				debug_printf("  sub key:       '%s'\n", t_strdup_until(needle, nend));
+				debug_printf("  value remnant: '%s'\n", vp <= vend ? t_strdup_until(vp, vend) : "");
+
+				/* Try matching the needle at fixed position */
+				if ( (needle == nend && next_wcard == '\0' && vp < vend ) ||
+					!cmp->def->char_match(cmp, &vp, vend, &needle, nend) ) {
+
+					/* Match failed: now we have a problem. We need to backtrack to the previous
+					 * '*' wildcard occurrence and start scanning for the next possible match.
+					 */
+
+					debug_printf("  failed fixed match\n");
+
+					/* Start backtrack */
+					if ( prv != NULL && prv + 1 < vend ) {
+						/* Restore pointers */
+						vp = prv;
+						kp = prk;
+						wp = prw;
+
+						/* Skip forward one value character to scan the next possible match */
+						if ( mvalues != NULL )
+							str_append_c(mvalue, *vp);
+						vp++;
+
+						/* Set wildcard state appropriately */
+						wcard = '*';
+						next_wcard = '?';
+
+						/* Backtrack */
+						backtrack = TRUE;
+
+						debug_printf("  BACKTRACK\n");
+					}
+
+					/* Break '?' wildcard scanning loop */
+					break;
+				}
+
+				/* Update wildcard and key pointers for next wildcard scan */
+				if ( wp < kend ) wp++;
+				kp = wp;
+			}
+
+			if ( !backtrack ) {
+				unsigned int i;
+
+				if ( next_wcard == '?' ) {
+					debug_printf("failed to match '?'\n");
+					break;
+				}
+
+				if ( mvalues != NULL ) {
+					if ( prv != NULL )
+						sieve_match_values_add(mvalues, mvalue);
+
+					chars = (const char *) str_data(mchars);
+
+					for ( i = 0; i < str_len(mchars); i++ ) {
+						sieve_match_values_add_char(mvalues, chars[i]);
+					}
+				}
+
+				if ( next_wcard != '*' ) {
+					debug_printf("failed to match at end of string\n");
+					break;
+				}
+			}
+		}
+
+		/* Check whether string ends in a wildcard
+		 * (avoid scanning the rest of the string)
+		 */
+		if ( kp == kend && next_wcard == '*' ) {
+			/* Add the rest of the string as match value */
+			if ( mvalues != NULL ) {
+				str_truncate(mvalue, 0);
+				str_append_data(mvalue, vp, vend-vp);
+				sieve_match_values_add(mvalues, mvalue);
+			}
+
+			/* Finish match */
+			kp = kend;
+			vp = vend;
+
+			debug_printf("key ends with '*'\n");
+			break;
+		}
+
+		debug_printf("== Loop ==\n");
+	}
+
+	/* Eat away a trailing series of *s */
+	if ( vp == vend ) {
+		while ( kp < kend && *kp == '*' ) kp++;
+	}
+
+	/* By definition, the match is only successful if both value and key pattern
+	 * are exhausted.
+	 */
+
+	debug_printf("=== Finish ===\n");
+	debug_printf("  result: %s\n", (kp == kend && vp == vend) ? "true" : "false");
+
+	if (kp == kend && vp == vend) {
+		/* Activate new match values after successful match */
+		if ( mvalues != NULL ) {
+			/* Set ${0} */
+			string_t *matched = str_new_const(pool_datastack_create(), val, val_size);
+			sieve_match_values_set(mvalues, 0, matched);
+
+			/* Commit new match values */
+			sieve_match_values_commit(mctx->runenv, &mvalues);
+		}
+		return 1;
+	}
+
+	/* No match; drop collected match values */
+	sieve_match_values_abort(&mvalues);
+	return 0;
+}
+
diff --git a/pigeonhole/src/lib-sieve/plugins/Makefile.am b/pigeonhole/src/lib-sieve/plugins/Makefile.am
new file mode 100644
index 0000000..2a1c054
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/Makefile.am
@@ -0,0 +1,32 @@
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+UNFINISHED = 
+endif
+
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+	vacation \
+	subaddress \
+	comparator-i-ascii-numeric \
+	relational \
+	regex \
+	imap4flags \
+	copy \
+	include \
+	body \
+	variables \
+	enotify \
+	notify \
+	environment \
+	mailbox \
+	date \
+	spamvirustest \
+	ihave \
+	editheader \
+	duplicate \
+	index \
+	metadata \
+	mime \
+	special-use \
+	vnd.dovecot \
+	$(UNFINISHED)
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/Makefile.in b/pigeonhole/src/lib-sieve/plugins/Makefile.in
new file mode 100644
index 0000000..8443114
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/Makefile.in
@@ -0,0 +1,719 @@
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+	enotify \
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+	duplicate \
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+	mime \
+	special-use \
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diff --git a/pigeonhole/src/lib-sieve/plugins/body/Makefile.in b/pigeonhole/src/lib-sieve/plugins/body/Makefile.in
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+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/body/ext-body-common.c b/pigeonhole/src/lib-sieve/plugins/body/ext-body-common.c
new file mode 100644
index 0000000..c19940e
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/body/ext-body-common.c
@@ -0,0 +1,102 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "mempool.h"
+#include "buffer.h"
+#include "array.h"
+#include "str.h"
+#include "istream.h"
+#include "mail-storage.h"
+
+#include "sieve-common.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-message.h"
+#include "sieve-interpreter.h"
+
+#include "ext-body-common.h"
+
+
+/*
+ * Body part stringlist
+ */
+
+static int ext_body_stringlist_next_item
+	(struct sieve_stringlist *_strlist, string_t **str_r);
+static void ext_body_stringlist_reset
+	(struct sieve_stringlist *_strlist);
+
+struct ext_body_stringlist {
+	struct sieve_stringlist strlist;
+
+	struct sieve_message_part_data *body_parts;
+	struct sieve_message_part_data *body_parts_iter;
+};
+
+int ext_body_get_part_list
+(const struct sieve_runtime_env *renv, enum tst_body_transform transform,
+	const char * const *content_types, struct sieve_stringlist **strlist_r)
+{
+	static const char * const _no_content_types[] = { "", NULL };
+	struct ext_body_stringlist *strlist;
+	struct sieve_message_part_data *body_parts = NULL;
+	int ret;
+
+	*strlist_r = NULL;
+
+	if ( content_types == NULL ) content_types = _no_content_types;
+
+	switch ( transform ) {
+	case TST_BODY_TRANSFORM_RAW:
+		if ( (ret=sieve_message_body_get_raw(renv, &body_parts)) <= 0 )
+			return ret;
+		break;
+	case TST_BODY_TRANSFORM_CONTENT:
+		if ( (ret=sieve_message_body_get_content
+			(renv, content_types, &body_parts)) <= 0 )
+			return ret;
+		break;
+	case TST_BODY_TRANSFORM_TEXT:
+		if ( (ret=sieve_message_body_get_text(renv, &body_parts)) <= 0 )
+			return ret;
+		break;
+	default:
+		i_unreached();
+	}
+
+	strlist = t_new(struct ext_body_stringlist, 1);
+	strlist->strlist.runenv = renv;
+	strlist->strlist.next_item = ext_body_stringlist_next_item;
+	strlist->strlist.reset = ext_body_stringlist_reset;
+	strlist->body_parts = body_parts;
+	strlist->body_parts_iter = body_parts;
+
+	*strlist_r = &strlist->strlist;
+	return SIEVE_EXEC_OK;
+}
+
+static int ext_body_stringlist_next_item
+(struct sieve_stringlist *_strlist, string_t **str_r)
+{
+	struct ext_body_stringlist *strlist =
+		(struct ext_body_stringlist *)_strlist;
+
+	*str_r = NULL;
+
+	if ( strlist->body_parts_iter->content == NULL ) return 0;
+
+	*str_r = t_str_new_const
+		(strlist->body_parts_iter->content, strlist->body_parts_iter->size);
+	strlist->body_parts_iter++;
+	return 1;
+}
+
+static void ext_body_stringlist_reset
+(struct sieve_stringlist *_strlist)
+{
+	struct ext_body_stringlist *strlist =
+		(struct ext_body_stringlist *)_strlist;
+
+	strlist->body_parts_iter = strlist->body_parts;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/body/ext-body-common.h b/pigeonhole/src/lib-sieve/plugins/body/ext-body-common.h
new file mode 100644
index 0000000..290ca13
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/body/ext-body-common.h
@@ -0,0 +1,40 @@
+#ifndef EXT_BODY_COMMON_H
+#define EXT_BODY_COMMON_H
+
+/*
+ * Types
+ */
+
+enum tst_body_transform {
+	TST_BODY_TRANSFORM_RAW,
+	TST_BODY_TRANSFORM_CONTENT,
+	TST_BODY_TRANSFORM_TEXT
+};
+
+/*
+ * Extension
+ */
+
+extern const struct sieve_extension_def body_extension;
+
+/*
+ * Commands
+ */
+
+extern const struct sieve_command_def body_test;
+
+/*
+ * Operations
+ */
+
+extern const struct sieve_operation_def body_operation;
+
+/*
+ * Message body part extraction
+ */
+
+int ext_body_get_part_list
+	(const struct sieve_runtime_env *renv, enum tst_body_transform transform,
+		const char * const *content_types, struct sieve_stringlist **strlist_r);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/body/ext-body.c b/pigeonhole/src/lib-sieve/plugins/body/ext-body.c
new file mode 100644
index 0000000..27218bd
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/body/ext-body.c
@@ -0,0 +1,54 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension body
+ * ------------------
+ *
+ * Authors: Stephan Bosch
+ *          Original CMUSieve implementation by Timo Sirainen
+ * Specification: RFC 5173
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "lib.h"
+#include "array.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-address-parts.h"
+
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-binary.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "ext-body-common.h"
+
+/*
+ * Extension
+ */
+
+static bool ext_body_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+
+const struct sieve_extension_def body_extension = {
+	.name = "body",
+	.validator_load =	ext_body_validator_load,
+	SIEVE_EXT_DEFINE_OPERATION(body_operation)
+};
+
+static bool ext_body_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	/* Register new test */
+	sieve_validator_register_command(valdtr, ext, &body_test);
+
+	return TRUE;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/body/tst-body.c b/pigeonhole/src/lib-sieve/plugins/body/tst-body.c
new file mode 100644
index 0000000..f08dd54
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/body/tst-body.c
@@ -0,0 +1,385 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-address-parts.h"
+
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-binary.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-match.h"
+
+#include "ext-body-common.h"
+
+/*
+ * Body test
+ *
+ * Syntax
+ *   body [COMPARATOR] [MATCH-TYPE] [BODY-TRANSFORM]
+ *     <key-list: string-list>
+ */
+
+static bool tst_body_registered
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+static bool tst_body_validate
+	(struct sieve_validator *valdtr, struct sieve_command *tst);
+static bool tst_body_generate
+	(const struct sieve_codegen_env *cgenv,	struct sieve_command *ctx);
+
+const struct sieve_command_def body_test = {
+	.identifier = "body",
+	.type = SCT_TEST,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = tst_body_registered,
+	.validate = tst_body_validate,
+	.generate = tst_body_generate
+};
+
+/*
+ * Body operation
+ */
+
+static bool ext_body_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int ext_body_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def body_operation = {
+	.mnemonic = "body",
+	.ext_def = &body_extension,
+	.dump = ext_body_operation_dump,
+	.execute = ext_body_operation_execute
+};
+
+/*
+ * Optional operands
+ */
+
+enum tst_body_optional {
+	OPT_BODY_TRANSFORM = SIEVE_MATCH_OPT_LAST
+};
+
+/*
+ * Tagged arguments
+ */
+
+/* Forward declarations */
+
+static bool tag_body_transform_validate
+	(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *cmd);
+static bool tag_body_transform_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+		struct sieve_command *cmd);
+
+/* Argument objects */
+
+static const struct sieve_argument_def body_raw_tag = {
+	.identifier = "raw",
+	.validate = tag_body_transform_validate,
+	.generate = tag_body_transform_generate
+};
+
+static const struct sieve_argument_def body_content_tag = {
+	.identifier = "content",
+	.validate = tag_body_transform_validate,
+	.generate = tag_body_transform_generate
+};
+
+static const struct sieve_argument_def body_text_tag = {
+	.identifier = "text",
+	.validate = tag_body_transform_validate,
+	.generate = tag_body_transform_generate
+};
+
+/* Argument implementation */
+
+static bool tag_body_transform_validate
+(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+	struct sieve_command *cmd)
+{
+	enum tst_body_transform transform;
+	struct sieve_ast_argument *tag = *arg;
+
+	/* BODY-TRANSFORM:
+	 *   :raw
+	 *     / :content <content-types: string-list>
+	 *     / :text
+	 */
+	if ( (bool) cmd->data ) {
+		sieve_argument_validate_error(valdtr, *arg,
+			"the :raw, :content and :text arguments for the body test are mutually "
+			"exclusive, but more than one was specified");
+		return FALSE;
+	}
+
+	/* Skip tag */
+	*arg = sieve_ast_argument_next(*arg);
+
+	/* :content tag has a string-list argument */
+	if ( sieve_argument_is(tag, body_raw_tag) )
+		transform = TST_BODY_TRANSFORM_RAW;
+
+	else if ( sieve_argument_is(tag, body_text_tag) )
+		transform = TST_BODY_TRANSFORM_TEXT;
+
+	else if ( sieve_argument_is(tag, body_content_tag) ) {
+		/* Check syntax:
+		 *   :content <content-types: string-list>
+		 */
+		if ( !sieve_validate_tag_parameter
+			(valdtr, cmd, tag, *arg, NULL, 0, SAAT_STRING_LIST, FALSE) ) {
+			return FALSE;
+		}
+
+		/* Assign tag parameters */
+		tag->parameters = *arg;
+		*arg = sieve_ast_arguments_detach(*arg,1);
+
+		transform = TST_BODY_TRANSFORM_CONTENT;
+	} else
+		return FALSE;
+
+	/* Signal the presence of this tag */
+	cmd->data = (void *) TRUE;
+
+	/* Assign context data */
+	tag->argument->data = (void *) transform;
+
+	return TRUE;
+}
+
+/*
+ * Command Registration
+ */
+
+static bool tst_body_registered
+(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+	struct sieve_command_registration *cmd_reg)
+{
+	/* The order of these is not significant */
+	sieve_comparators_link_tag(valdtr, cmd_reg, SIEVE_MATCH_OPT_COMPARATOR);
+	sieve_match_types_link_tags(valdtr, cmd_reg, SIEVE_MATCH_OPT_MATCH_TYPE);
+
+	sieve_validator_register_tag
+		(valdtr, cmd_reg, ext, &body_raw_tag, OPT_BODY_TRANSFORM);
+	sieve_validator_register_tag
+		(valdtr, cmd_reg, ext, &body_content_tag, OPT_BODY_TRANSFORM);
+	sieve_validator_register_tag
+		(valdtr, cmd_reg, ext, &body_text_tag, OPT_BODY_TRANSFORM);
+
+	return TRUE;
+}
+
+/*
+ * Validation
+ */
+
+static bool tst_body_validate
+(struct sieve_validator *valdtr, struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+	const struct sieve_match_type mcht_default =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	const struct sieve_comparator cmp_default =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "key list", 1, SAAT_STRING_LIST) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, tst, arg, FALSE) )
+		return FALSE;
+
+	/* Validate the key argument to a specified match type */
+	return sieve_match_type_validate
+		(valdtr, tst, arg, &mcht_default, &cmp_default);
+}
+
+/*
+ * Code generation
+ */
+
+static bool tst_body_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	(void)sieve_operation_emit(cgenv->sblock, cmd->ext, &body_operation);
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, cmd, NULL);
+}
+
+static bool tag_body_transform_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+	struct sieve_command *cmd ATTR_UNUSED)
+{
+	enum tst_body_transform transform =
+		POINTER_CAST_TO(arg->argument->data, enum tst_body_transform);
+
+	sieve_binary_emit_byte(cgenv->sblock, transform);
+	sieve_generate_argument_parameters(cgenv, cmd, arg);
+
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool ext_body_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	unsigned int transform;
+	int opt_code = 0;
+
+	sieve_code_dumpf(denv, "BODY");
+	sieve_code_descend(denv);
+
+	/* Handle any optional arguments */
+	for (;;) {
+		int opt;
+
+		if ( (opt=sieve_match_opr_optional_dump(denv, address, &opt_code))
+			< 0 )
+			return FALSE;
+
+		if ( opt == 0 ) break;
+
+		switch ( opt_code ) {
+		case OPT_BODY_TRANSFORM:
+			if ( !sieve_binary_read_byte(denv->sblock, address, &transform) )
+				return FALSE;
+
+			switch ( transform ) {
+			case TST_BODY_TRANSFORM_RAW:
+				sieve_code_dumpf(denv, "BODY-TRANSFORM: RAW");
+				break;
+			case TST_BODY_TRANSFORM_TEXT:
+				sieve_code_dumpf(denv, "BODY-TRANSFORM: TEXT");
+				break;
+			case TST_BODY_TRANSFORM_CONTENT:
+				sieve_code_dumpf(denv, "BODY-TRANSFORM: CONTENT");
+
+				sieve_code_descend(denv);
+				if ( !sieve_opr_stringlist_dump(denv, address, "content types") )
+					return FALSE;
+				sieve_code_ascend(denv);
+				break;
+			default:
+				return FALSE;
+			}
+			break;
+		default:
+			return FALSE;
+		}
+	};
+
+	return sieve_opr_stringlist_dump(denv, address, "key list");
+}
+
+/*
+ * Interpretation
+ */
+
+static int ext_body_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	int opt_code = 0;
+	struct sieve_comparator cmp =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+	struct sieve_match_type mcht =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	unsigned int transform = TST_BODY_TRANSFORM_TEXT;
+	struct sieve_stringlist *ctype_list, *value_list, *key_list;
+	bool mvalues_active;
+	const char * const *content_types = NULL;
+	int match, ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Optional operands */
+
+	ctype_list = NULL;
+	for (;;) {
+		int opt;
+
+		if ( (opt=sieve_match_opr_optional_read
+			(renv, address, &opt_code, &ret, &cmp, &mcht)) < 0 )
+			return ret;
+
+		if ( opt == 0 ) break;
+
+		switch ( opt_code ) {
+		case OPT_BODY_TRANSFORM:
+			if ( !sieve_binary_read_byte(renv->sblock, address, &transform) ||
+				transform > TST_BODY_TRANSFORM_TEXT ) {
+				sieve_runtime_trace_error(renv, "invalid body transform type");
+				return SIEVE_EXEC_BIN_CORRUPT;
+			}
+
+			if ( transform == TST_BODY_TRANSFORM_CONTENT &&
+				(ret=sieve_opr_stringlist_read
+					(renv, address, "content-type-list", &ctype_list)) <= 0 )
+				return ret;
+
+			break;
+
+		default:
+			sieve_runtime_trace_error(renv, "unknown optional operand");
+			return SIEVE_EXEC_BIN_CORRUPT;
+		}
+	}
+
+	/* Read key-list */
+
+	if ( (ret=sieve_opr_stringlist_read(renv, address, "key-list", &key_list))
+		<= 0 )
+		return ret;
+
+	if ( ctype_list != NULL && sieve_stringlist_read_all
+		(ctype_list, pool_datastack_create(), &content_types) < 0 ) {
+		sieve_runtime_trace_error(renv, "failed to read content-type-list operand");
+		return ctype_list->exec_status;
+	}
+
+	/*
+	 * Perform operation
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS, "body test");
+
+	/* Extract requested parts */
+	if ( (ret=ext_body_get_part_list(renv,
+		(enum tst_body_transform) transform, content_types,&value_list)) <= 0 )
+		return ret;
+
+	/* Disable match values processing as required by RFC */
+	mvalues_active = sieve_match_values_set_enabled(renv, FALSE);
+
+	/* Perform match */
+	match = sieve_match(renv, &mcht, &cmp, value_list, key_list, &ret);
+
+	/* Restore match values processing */
+	(void)sieve_match_values_set_enabled(renv, mvalues_active);
+
+	if ( match < 0 )
+		return ret;
+
+	/* Set test result for subsequent conditional jump */
+	sieve_interpreter_set_test_result(renv->interp, match > 0);
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/comparator-i-ascii-numeric/Makefile.am b/pigeonhole/src/lib-sieve/plugins/comparator-i-ascii-numeric/Makefile.am
new file mode 100644
index 0000000..8e385c5
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/comparator-i-ascii-numeric/Makefile.am
@@ -0,0 +1,8 @@
+noinst_LTLIBRARIES = libsieve_ext_comparator-i-ascii-numeric.la
+
+AM_CPPFLAGS = \
+	-I$(srcdir)/../.. \
+	$(LIBDOVECOT_INCLUDE)
+
+libsieve_ext_comparator_i_ascii_numeric_la_SOURCES = \
+	ext-cmp-i-ascii-numeric.c
diff --git a/pigeonhole/src/lib-sieve/plugins/comparator-i-ascii-numeric/Makefile.in b/pigeonhole/src/lib-sieve/plugins/comparator-i-ascii-numeric/Makefile.in
new file mode 100644
index 0000000..35ef51f
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/comparator-i-ascii-numeric/Makefile.in
@@ -0,0 +1,674 @@
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+
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diff --git a/pigeonhole/src/lib-sieve/plugins/comparator-i-ascii-numeric/ext-cmp-i-ascii-numeric.c b/pigeonhole/src/lib-sieve/plugins/comparator-i-ascii-numeric/ext-cmp-i-ascii-numeric.c
new file mode 100644
index 0000000..20ec38b
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/comparator-i-ascii-numeric/ext-cmp-i-ascii-numeric.c
@@ -0,0 +1,160 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension comparator-i;ascii-numeric
+ * ------------------------------------
+ *
+ * Author: Stephan Bosch
+ * Specification: RFC 2244
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "sieve-common.h"
+
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-comparators.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+
+#include <ctype.h>
+
+/*
+ * Forward declarations
+ */
+
+static const struct sieve_operand_def my_comparator_operand;
+
+const struct sieve_comparator_def i_ascii_numeric_comparator;
+
+/*
+ * Extension
+ */
+
+static bool ext_cmp_i_ascii_numeric_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *validator);
+
+const struct sieve_extension_def comparator_i_ascii_numeric_extension = {
+	.name = "comparator-i;ascii-numeric",
+	.validator_load = ext_cmp_i_ascii_numeric_validator_load,
+	SIEVE_EXT_DEFINE_OPERAND(my_comparator_operand)
+};
+
+static bool ext_cmp_i_ascii_numeric_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *validator)
+{
+	sieve_comparator_register(validator, ext, &i_ascii_numeric_comparator);
+	return TRUE;
+}
+
+/*
+ * Operand
+ */
+
+static const struct sieve_extension_objects ext_comparators =
+	SIEVE_EXT_DEFINE_COMPARATOR(i_ascii_numeric_comparator);
+
+static const struct sieve_operand_def my_comparator_operand = {
+	.name = "comparator-i;ascii-numeric",
+	.ext_def = &comparator_i_ascii_numeric_extension,
+	.class = &sieve_comparator_operand_class,
+	.interface = &ext_comparators
+};
+
+/*
+ * Comparator
+ */
+
+/* Forward declarations */
+
+static int cmp_i_ascii_numeric_compare
+	(const struct sieve_comparator *cmp,
+		const char *val1, size_t val1_size, const char *val2, size_t val2_size);
+
+/* Comparator object */
+
+const struct sieve_comparator_def i_ascii_numeric_comparator = {
+	SIEVE_OBJECT("i;ascii-numeric",
+		&my_comparator_operand, 0),
+	.flags =
+		SIEVE_COMPARATOR_FLAG_ORDERING |
+		SIEVE_COMPARATOR_FLAG_EQUALITY,
+	.compare = cmp_i_ascii_numeric_compare
+};
+
+/* Comparator implementation */
+
+static int cmp_i_ascii_numeric_compare
+	(const struct sieve_comparator *cmp ATTR_UNUSED,
+		const char *val, size_t val_size, const char *key, size_t key_size)
+{
+	const char *vend = val + val_size;
+	const char *kend = key + key_size;
+	const char *vp = val;
+	const char *kp = key;
+	int digits, i;
+
+	/* RFC 4790: All input is valid; strings that do not start with a digit
+	 * represent positive infinity.
+	 */
+	if ( !i_isdigit(*vp) ) {
+		if ( i_isdigit(*kp) ) {
+			/* Value is greater */
+			return 1;
+		}
+	} else {
+		if ( !i_isdigit(*kp) ) {
+			/* Value is less */
+			return -1;
+		}
+	}
+
+	/* Ignore leading zeros */
+
+	while ( *vp == '0' && vp < vend )
+		vp++;
+
+	while ( *kp == '0' && kp < kend )
+		kp++;
+
+	/* Check whether both numbers are equally long in terms of digits */
+
+	digits = 0;
+	while ( vp < vend && kp < kend && i_isdigit(*vp) && i_isdigit(*kp) ) {
+		vp++;
+		kp++;
+		digits++;
+	}
+
+	if ( vp == vend || !i_isdigit(*vp) ) {
+		if ( kp != kend && i_isdigit(*kp) ) {
+			/* Value is less */
+			return -1;
+		}
+	} else {
+		/* Value is greater */
+		return 1;
+	}
+
+	/* Equally long: compare digits */
+
+	vp -= digits;
+	kp -= digits;
+	i = 0;
+	while ( i < digits ) {
+		if ( *vp > *kp )
+			return 1;
+		else if ( *vp < *kp )
+			return -1;
+
+		kp++;
+		vp++;
+		i++;
+	}
+
+	return 0;
+}
+
diff --git a/pigeonhole/src/lib-sieve/plugins/copy/Makefile.am b/pigeonhole/src/lib-sieve/plugins/copy/Makefile.am
new file mode 100644
index 0000000..483032a
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/copy/Makefile.am
@@ -0,0 +1,18 @@
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+
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diff --git a/pigeonhole/src/lib-sieve/plugins/copy/Makefile.in b/pigeonhole/src/lib-sieve/plugins/copy/Makefile.in
new file mode 100644
index 0000000..9824089
--- /dev/null
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diff --git a/pigeonhole/src/lib-sieve/plugins/copy/ext-copy.c b/pigeonhole/src/lib-sieve/plugins/copy/ext-copy.c
new file mode 100644
index 0000000..e7db9dd
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/copy/ext-copy.c
@@ -0,0 +1,183 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension copy
+ * --------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 3894
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "sieve-common.h"
+
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-actions.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-result.h"
+
+#include "sieve-ext-copy.h"
+
+/*
+ * Forward declarations
+ */
+
+static const struct sieve_argument_def copy_tag;
+static const struct sieve_operand_def copy_side_effect_operand;
+
+/*
+ * Extension
+ */
+
+static bool
+ext_copy_validator_load(const struct sieve_extension *ext,
+			struct sieve_validator *valdtr);
+
+const struct sieve_extension_def copy_extension = {
+	.name = "copy",
+	.validator_load = ext_copy_validator_load,
+	SIEVE_EXT_DEFINE_OPERAND(copy_side_effect_operand),
+};
+
+static bool
+ext_copy_validator_load(const struct sieve_extension *ext,
+			struct sieve_validator *valdtr)
+{
+	/* Register copy tag with redirect and fileinto commands and we don't
+	   care whether these commands are registered or even whether they will
+	   be registered at all. The validator handles either situation
+	   gracefully.
+	 */
+	sieve_validator_register_external_tag(valdtr, "redirect", ext,
+					      &copy_tag, SIEVE_OPT_SIDE_EFFECT);
+	sieve_validator_register_external_tag(valdtr, "fileinto", ext,
+					      &copy_tag, SIEVE_OPT_SIDE_EFFECT);
+	return TRUE;
+}
+
+/*
+ * Side effect
+ */
+
+static void
+seff_copy_print(const struct sieve_side_effect *seffect,
+		const struct sieve_action *action,
+		const struct sieve_result_print_env *rpenv, bool *keep);
+static int
+seff_copy_post_execute(const struct sieve_side_effect *seffect ATTR_UNUSED,
+		       const struct sieve_action_exec_env *aenv ATTR_UNUSED,
+		       void *tr_context ATTR_UNUSED,
+		       void *se_tr_context ATTR_UNUSED, bool *keep);
+
+const struct sieve_side_effect_def copy_side_effect = {
+	SIEVE_OBJECT("copy", &copy_side_effect_operand, 0),
+	.to_action = &act_store,
+	.print = seff_copy_print,
+	.post_execute = seff_copy_post_execute,
+};
+
+/*
+ * Tagged argument
+ */
+
+static bool
+tag_copy_validate(struct sieve_validator *valdtr,
+		  struct sieve_ast_argument **arg, struct sieve_command *cmd);
+static bool
+tag_copy_generate(const struct sieve_codegen_env *cgenv,
+		  struct sieve_ast_argument *arg, struct sieve_command *cmd);
+
+static const struct sieve_argument_def copy_tag = {
+	.identifier = "copy",
+	.validate = tag_copy_validate,
+	.generate = tag_copy_generate,
+};
+
+/*
+ * Operand
+ */
+
+static const struct sieve_extension_objects ext_side_effects =
+	SIEVE_EXT_DEFINE_SIDE_EFFECT(copy_side_effect);
+
+static const struct sieve_operand_def copy_side_effect_operand = {
+	.name = "copy operand",
+	.ext_def = &copy_extension,
+	.class = &sieve_side_effect_operand_class,
+	.interface = &ext_side_effects,
+};
+
+/*
+ * Tag registration
+ */
+
+void sieve_ext_copy_register_tag(struct sieve_validator *valdtr,
+				 const struct sieve_extension *copy_ext,
+				 const char *command)
+{
+	if (sieve_validator_extension_loaded(valdtr, copy_ext)) {
+		sieve_validator_register_external_tag(
+			valdtr, command, copy_ext, &copy_tag,
+			SIEVE_OPT_SIDE_EFFECT);
+	}
+}
+
+/*
+ * Tag validation
+ */
+
+static bool
+tag_copy_validate(struct sieve_validator *valdtr ATTR_UNUSED,
+		  struct sieve_ast_argument **arg ATTR_UNUSED,
+		  struct sieve_command *cmd ATTR_UNUSED)
+{
+	*arg = sieve_ast_argument_next(*arg);
+
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool
+tag_copy_generate(const struct sieve_codegen_env *cgenv,
+		  struct sieve_ast_argument *arg,
+		  struct sieve_command *cmd ATTR_UNUSED)
+{
+	if (sieve_ast_argument_type(arg) != SAAT_TAG)
+		return FALSE;
+
+	sieve_opr_side_effect_emit(cgenv->sblock, sieve_argument_ext(arg),
+				   &copy_side_effect);
+	return TRUE;
+}
+
+/*
+ * Side effect implementation
+ */
+
+static void
+seff_copy_print(const struct sieve_side_effect *seffect ATTR_UNUSED,
+		const struct sieve_action *action ATTR_UNUSED,
+		const struct sieve_result_print_env *rpenv, bool *keep)
+{
+	sieve_result_seffect_printf(rpenv, "preserve implicit keep");
+	*keep = TRUE;
+}
+
+static int
+seff_copy_post_execute(const struct sieve_side_effect *seffect ATTR_UNUSED,
+		       const struct sieve_action_exec_env *aenv ATTR_UNUSED,
+		       void *tr_context ATTR_UNUSED,
+		       void *se_tr_context ATTR_UNUSED, bool *keep)
+{
+	*keep = TRUE;
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/copy/sieve-ext-copy.h b/pigeonhole/src/lib-sieve/plugins/copy/sieve-ext-copy.h
new file mode 100644
index 0000000..faf19dc
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/copy/sieve-ext-copy.h
@@ -0,0 +1,21 @@
+#ifndef SIEVE_EXT_COPY_H
+#define SIEVE_EXT_COPY_H
+
+/* sieve_ext_copy_get_extension():
+ *   Get the extension struct for the copy extension.
+ */
+static inline const struct sieve_extension *sieve_ext_copy_get_extension
+(struct sieve_instance *svinst)
+{
+	return sieve_extension_get_by_name(svinst, "copy");
+}
+
+/* sieve_ext_copy_register_tag():
+ *   Register the :copy tagged argument for a command other than fileinto and
+ *   redirect.
+ */
+void sieve_ext_copy_register_tag
+	(struct sieve_validator *valdtr, const struct sieve_extension *copy_ext,
+		const char *command);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/date/Makefile.am b/pigeonhole/src/lib-sieve/plugins/date/Makefile.am
new file mode 100644
index 0000000..bf257ac
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/date/Makefile.am
@@ -0,0 +1,16 @@
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+
+AM_CPPFLAGS = \
+	-I$(srcdir)/../.. \
+	$(LIBDOVECOT_INCLUDE)
+
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+	tst-date.c
+
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+	$(tests) \
+	ext-date-common.c \
+	ext-date.c
+
+noinst_HEADERS = \
+	ext-date-common.h
diff --git a/pigeonhole/src/lib-sieve/plugins/date/Makefile.in b/pigeonhole/src/lib-sieve/plugins/date/Makefile.in
new file mode 100644
index 0000000..0bc3ec0
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/date/Makefile.in
@@ -0,0 +1,692 @@
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+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
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+	esac; \
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+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
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+distdir: $(BUILT_SOURCES)
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+
+distdir-am: $(DISTFILES)
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+			   sort -u` ;; \
+	esac; \
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+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
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+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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+	fi
+mostlyclean-generic:
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+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/date/ext-date-common.c b/pigeonhole/src/lib-sieve/plugins/date/ext-date-common.c
new file mode 100644
index 0000000..7493b87
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/date/ext-date-common.c
@@ -0,0 +1,593 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "utc-offset.h"
+#include "str.h"
+#include "iso8601-date.h"
+#include "message-date.h"
+
+#include "sieve-common.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-interpreter.h"
+#include "sieve-message.h"
+
+#include "ext-date-common.h"
+
+#include <time.h>
+#include <ctype.h>
+
+struct ext_date_context {
+	time_t current_date;
+	int zone_offset;
+};
+
+/*
+ * Runtime initialization
+ */
+
+static int ext_date_runtime_init
+(const struct sieve_extension *ext,
+	const struct sieve_runtime_env *renv,
+	void *context ATTR_UNUSED, bool deferred ATTR_UNUSED)
+{
+	struct ext_date_context *dctx;
+	pool_t pool;
+	struct timeval msg_time;
+	time_t current_date;
+	struct tm *tm;
+	int zone_offset;
+
+	/* Get current time at instance main script is started */
+	sieve_message_context_time(renv->msgctx, &msg_time);
+	current_date = msg_time.tv_sec;
+
+	tm = localtime(&current_date);
+	zone_offset = utc_offset(tm, current_date);
+
+	/* Create context */
+	pool = sieve_message_context_pool(renv->msgctx);
+	dctx = p_new(pool, struct ext_date_context, 1);
+	dctx->current_date = current_date;
+	dctx->zone_offset = zone_offset;
+
+	sieve_message_context_extension_set
+		(renv->msgctx, ext, (void *) dctx);
+	return SIEVE_EXEC_OK;
+}
+
+static struct sieve_interpreter_extension
+date_interpreter_extension = {
+	.ext_def = &date_extension,
+	.run = ext_date_runtime_init
+};
+
+bool ext_date_interpreter_load
+(const struct sieve_extension *ext, const struct sieve_runtime_env *renv,
+	sieve_size_t *address ATTR_UNUSED)
+{
+	/* Register runtime hook to obtain stript start timestamp */
+	if ( renv->msgctx == NULL ||
+		sieve_message_context_extension_get(renv->msgctx, ext) == NULL ) {
+		sieve_interpreter_extension_register
+			(renv->interp, ext, &date_interpreter_extension, NULL);
+	}
+
+	return TRUE;
+}
+
+/*
+ * Zone string
+ */
+
+bool ext_date_parse_timezone
+(const char *zone, int *zone_offset_r)
+{
+	const unsigned char *str = (const unsigned char *) zone;
+	size_t len = strlen(zone);
+
+	if (len == 5 && (*str == '+' || *str == '-')) {
+		int offset;
+
+		if (!i_isdigit(str[1]) || !i_isdigit(str[2]) ||
+		    !i_isdigit(str[3]) || !i_isdigit(str[4]))
+			return FALSE;
+
+		offset = ((str[1]-'0') * 10 + (str[2]-'0')) * 60  +
+			(str[3]-'0') * 10 + (str[4]-'0');
+
+		if ( zone_offset_r != NULL )
+			*zone_offset_r = *str == '+' ? offset : -offset;
+
+		return TRUE;
+	}
+
+	return FALSE;
+}
+
+/*
+ * Current date
+ */
+
+time_t ext_date_get_current_date
+(const struct sieve_runtime_env *renv, int *zone_offset_r)
+{
+	const struct sieve_extension *this_ext = renv->oprtn->ext;
+	struct ext_date_context *dctx = (struct ext_date_context *)
+		sieve_message_context_extension_get(renv->msgctx, this_ext);
+
+	if ( dctx == NULL ) {
+		ext_date_runtime_init(this_ext, renv, NULL, FALSE);
+		dctx = (struct ext_date_context *)
+			sieve_message_context_extension_get(renv->msgctx, this_ext);
+
+		i_assert(dctx != NULL);
+	}
+
+	/* Read script start timestamp from message context */
+
+	if ( zone_offset_r != NULL )
+		*zone_offset_r = dctx->zone_offset;
+
+	return dctx->current_date;
+}
+
+/*
+ * Date parts
+ */
+
+/* "year"      => the year, "0000" .. "9999".
+ */
+
+static const char *ext_date_year_part_get(struct tm *tm, int zone_offset);
+
+static const struct ext_date_part year_date_part = {
+	"year",
+	ext_date_year_part_get
+};
+
+/* "month"     => the month, "01" .. "12".
+ */
+
+static const char *ext_date_month_part_get(struct tm *tm, int zone_offset);
+
+static const struct ext_date_part month_date_part = {
+	"month",
+	ext_date_month_part_get
+};
+
+/* "day"       => the day, "01" .. "31".
+ */
+
+static const char *ext_date_day_part_get(struct tm *tm, int zone_offset);
+
+static const struct ext_date_part day_date_part = {
+	"day",
+	ext_date_day_part_get
+};
+
+/* "date"      => the date in "yyyy-mm-dd" format.
+ */
+
+static const char *ext_date_date_part_get(struct tm *tm, int zone_offset);
+
+static const struct ext_date_part date_date_part = {
+	"date",
+	ext_date_date_part_get
+};
+
+/* "julian"    => the Modified Julian Day, that is, the date
+ *              expressed as an integer number of days since
+ *              00:00 UTC on November 17, 1858 (using the Gregorian
+ *              calendar).  This corresponds to the regular
+ *              Julian Day minus 2400000.5.  Sample routines to
+ *              convert to and from modified Julian dates are
+ *              given in Appendix A.
+ */
+
+static const char *ext_date_julian_part_get(struct tm *tm, int zone_offset);
+
+static const struct ext_date_part julian_date_part = {
+	"julian",
+	ext_date_julian_part_get
+};
+
+/* "hour"      => the hour, "00" .. "23".
+ */
+static const char *ext_date_hour_part_get(struct tm *tm, int zone_offset);
+
+static const struct ext_date_part hour_date_part = {
+	"hour",
+	ext_date_hour_part_get
+};
+
+/* "minute"    => the minute, "00" .. "59".
+ */
+static const char *ext_date_minute_part_get(struct tm *tm, int zone_offset);
+
+static const struct ext_date_part minute_date_part = {
+	"minute",
+	ext_date_minute_part_get
+};
+
+/* "second"    => the second, "00" .. "60".
+ */
+static const char *ext_date_second_part_get(struct tm *tm, int zone_offset);
+
+static const struct ext_date_part second_date_part = {
+	"second",
+	ext_date_second_part_get
+};
+
+/* "time"      => the time in "hh:mm:ss" format.
+ */
+static const char *ext_date_time_part_get(struct tm *tm, int zone_offset);
+
+static const struct ext_date_part time_date_part = {
+	"time",
+	ext_date_time_part_get
+};
+
+/* "iso8601"   => the date and time in restricted ISO 8601 format.
+ */
+static const char *ext_date_iso8601_part_get(struct tm *tm, int zone_offset);
+
+static const struct ext_date_part iso8601_date_part = {
+	"iso8601",
+	ext_date_iso8601_part_get
+};
+
+/* "std11"     => the date and time in a format appropriate
+ *                for use in a Date: header field [RFC2822].
+ */
+static const char *ext_date_std11_part_get(struct tm *tm, int zone_offset);
+
+static const struct ext_date_part std11_date_part = {
+	"std11",
+	ext_date_std11_part_get
+};
+
+/* "zone"      => the time zone in use.  If the user specified a
+ *                time zone with ":zone", "zone" will
+ *                contain that value.  If :originalzone is specified
+ *                this value will be the original zone specified
+ *                in the date-time value.  If neither argument is
+ *                specified the value will be the server's default
+ *                time zone in offset format "+hhmm" or "-hhmm".  An
+ *                 offset of 0 (Zulu) always has a positive sign.
+ */
+static const char *ext_date_zone_part_get(struct tm *tm, int zone_offset);
+
+static const struct ext_date_part zone_date_part = {
+	"zone",
+	ext_date_zone_part_get
+};
+
+/* "weekday"   => the day of the week expressed as an integer between
+ *                "0" and "6". "0" is Sunday, "1" is Monday, etc.
+ */
+static const char *ext_date_weekday_part_get(struct tm *tm, int zone_offset);
+
+static const struct ext_date_part weekday_date_part = {
+	"weekday",
+	ext_date_weekday_part_get
+};
+
+/*
+ * Date part extraction
+ */
+
+static const struct ext_date_part *date_parts[] = {
+	&year_date_part, &month_date_part, &day_date_part, &date_date_part,
+	&julian_date_part, &hour_date_part, &minute_date_part, &second_date_part,
+	&time_date_part, &iso8601_date_part, &std11_date_part, &zone_date_part,
+	&weekday_date_part
+};
+
+unsigned int date_parts_count = N_ELEMENTS(date_parts);
+
+const struct ext_date_part *ext_date_part_find(const char *part)
+{
+	unsigned int i;
+
+	for ( i = 0; i < date_parts_count; i++ ) {
+		if ( strcasecmp(date_parts[i]->identifier, part) == 0 ) {
+			return date_parts[i];
+		}
+	}
+
+	return NULL;
+}
+
+const char *ext_date_part_extract
+(const struct ext_date_part *dpart, struct tm *tm, int zone_offset)
+{
+	if ( dpart == NULL || dpart->get_string == NULL )
+		return NULL;
+
+	return dpart->get_string(tm, zone_offset);
+}
+
+/*
+ * Date part implementations
+ */
+
+static const char *month_names[] = {
+	"Jan", "Feb", "Mar", "Apr", "May", "Jun",
+	"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
+};
+
+static const char *weekday_names[] = {
+	"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"
+};
+
+static const char *ext_date_year_part_get
+(struct tm *tm, int zone_offset ATTR_UNUSED)
+{
+	return t_strdup_printf("%04d", tm->tm_year + 1900);
+}
+
+static const char *ext_date_month_part_get
+(struct tm *tm, int zone_offset ATTR_UNUSED)
+{
+	return t_strdup_printf("%02d", tm->tm_mon + 1);
+}
+
+static const char *ext_date_day_part_get
+(struct tm *tm, int zone_offset ATTR_UNUSED)
+{
+	return t_strdup_printf("%02d", tm->tm_mday);
+}
+
+static const char *ext_date_date_part_get
+(struct tm *tm, int zone_offset ATTR_UNUSED)
+{
+	return t_strdup_printf("%04d-%02d-%02d",
+		tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday);
+}
+
+static const char *ext_date_julian_part_get
+(struct tm *tm, int zone_offset ATTR_UNUSED)
+{
+	int year = tm->tm_year+1900;
+	int month = tm->tm_mon+1;
+	int day = tm->tm_mday;
+	int c, ya, jd;
+
+	/* Modified from RFC 5260 Appendix A (refer to Errata) */
+
+	if ( month > 2 )
+		month -= 3;
+	else {
+		month += 9;
+		year--;
+	}
+
+	c = year / 100;
+	ya = year - c * 100;
+
+	jd = c * 146097 / 4 + ya * 1461 / 4 + (month * 153 + 2) / 5 + day + 1721119;
+
+	return t_strdup_printf("%d", jd - 2400001);
+}
+
+static const char *ext_date_hour_part_get
+(struct tm *tm, int zone_offset ATTR_UNUSED)
+{
+	return t_strdup_printf("%02d", tm->tm_hour);
+}
+
+static const char *ext_date_minute_part_get
+(struct tm *tm, int zone_offset ATTR_UNUSED)
+{
+	return t_strdup_printf("%02d", tm->tm_min);
+}
+
+static const char *ext_date_second_part_get
+(struct tm *tm, int zone_offset ATTR_UNUSED)
+{
+	return t_strdup_printf("%02d", tm->tm_sec);
+}
+
+static const char *ext_date_time_part_get
+(struct tm *tm, int zone_offset ATTR_UNUSED)
+{
+	return t_strdup_printf("%02d:%02d:%02d", tm->tm_hour, tm->tm_min, tm->tm_sec);
+}
+
+static const char *ext_date_iso8601_part_get
+(struct tm *tm, int zone_offset)
+{
+	/* From RFC: `The restricted ISO 8601 format is specified by the date-time
+	 * ABNF production given in [RFC3339], Section 5.6, with the added
+   * restrictions that the letters "T" and "Z" MUST be in upper case, and
+	 * a time zone offset of zero MUST be represented by "Z" and not "+00:00".
+	 */
+	if ( zone_offset == 0 )
+		zone_offset = INT_MAX;
+
+	return iso8601_date_create_tm(tm, zone_offset);
+}
+
+
+static const char *ext_date_std11_part_get
+(struct tm *tm, int zone_offset)
+{
+	return t_strdup_printf("%s, %02d %s %04d %02d:%02d:%02d %s",
+		weekday_names[tm->tm_wday],
+		tm->tm_mday,
+		month_names[tm->tm_mon],
+		tm->tm_year+1900,
+		tm->tm_hour, tm->tm_min, tm->tm_sec,
+		ext_date_zone_part_get(tm, zone_offset));
+}
+
+static const char *ext_date_zone_part_get
+(struct tm *tm ATTR_UNUSED, int zone_offset)
+{
+	bool negative;
+	int offset = zone_offset;
+
+	if (zone_offset >= 0)
+		negative = FALSE;
+	else {
+		negative = TRUE;
+		offset = -offset;
+	}
+
+	return t_strdup_printf
+		("%c%02d%02d", negative ? '-' : '+', offset / 60, offset % 60);
+}
+
+static const char *ext_date_weekday_part_get
+(struct tm *tm, int zone_offset ATTR_UNUSED)
+{
+	return t_strdup_printf("%d", tm->tm_wday);
+}
+
+/*
+ * Date stringlist
+ */
+
+/* Forward declarations */
+
+static int ext_date_stringlist_next_item
+	(struct sieve_stringlist *_strlist, string_t **str_r);
+static void ext_date_stringlist_reset
+	(struct sieve_stringlist *_strlist);
+
+/* Stringlist object */
+
+struct ext_date_stringlist {
+	struct sieve_stringlist strlist;
+
+	struct sieve_stringlist *field_values;
+	int time_zone;
+	const struct ext_date_part *date_part;
+
+	time_t local_time;
+	int local_zone;
+
+	bool read:1;
+};
+
+struct sieve_stringlist *ext_date_stringlist_create
+(const struct sieve_runtime_env *renv, struct sieve_stringlist *field_values,
+	int time_zone, const struct ext_date_part *dpart)
+{
+	struct ext_date_stringlist *strlist;
+
+	strlist = t_new(struct ext_date_stringlist, 1);
+	strlist->strlist.runenv = renv;
+	strlist->strlist.exec_status = SIEVE_EXEC_OK;
+	strlist->strlist.next_item = ext_date_stringlist_next_item;
+	strlist->strlist.reset = ext_date_stringlist_reset;
+	strlist->field_values = field_values;
+	strlist->time_zone = time_zone;
+	strlist->date_part = dpart;
+
+	strlist->local_time = ext_date_get_current_date(renv, &strlist->local_zone);
+
+	return &strlist->strlist;
+}
+
+/* Stringlist implementation */
+
+static int ext_date_stringlist_next_item
+(struct sieve_stringlist *_strlist, string_t **str_r)
+{
+	struct ext_date_stringlist *strlist =
+		(struct ext_date_stringlist *) _strlist;
+	bool got_date = FALSE;
+	time_t date_value;
+	const char *part_value = NULL;
+	int original_zone;
+
+	/* Check whether the item was already read */
+	if ( strlist->read ) return 0;
+
+	if ( strlist->field_values != NULL ) {
+		string_t *hdr_item;
+		const char *header_value, *date_string;
+		int ret;
+
+		/* Use header field value */
+
+		/* Read first */
+		if ( (ret=sieve_stringlist_next_item(strlist->field_values, &hdr_item))
+			<= 0 )
+			return ret;
+
+		/* Extract the date string value */
+
+		header_value = str_c(hdr_item);
+		date_string = strrchr(header_value, ';');
+
+		if ( date_string == NULL ) {
+			/* Direct header value */
+			date_string = header_value;
+		} else {
+			/* Delimited by ';', e.g. a Received: header */
+			date_string++;
+		}
+
+		/* Parse the date value */
+		if ( message_date_parse((const unsigned char *) date_string,
+			strlen(date_string), &date_value, &original_zone) ) {
+			got_date = TRUE;
+		}
+	} else {
+		/* Use time stamp recorded at the time the script first started */
+		date_value = strlist->local_time;
+		original_zone = strlist->local_zone;
+		got_date = TRUE;
+	}
+
+	if ( got_date ) {
+		int wanted_zone;
+		struct tm *date_tm;
+
+		/* Apply wanted timezone */
+
+		switch ( strlist->time_zone ) {
+		case EXT_DATE_TIMEZONE_LOCAL:
+			wanted_zone = strlist->local_zone;
+			break;
+		case EXT_DATE_TIMEZONE_ORIGINAL:
+			wanted_zone = original_zone;
+			break;
+		default:
+			wanted_zone = strlist->time_zone;
+		}
+
+		date_value += wanted_zone * 60;
+
+		/* Convert timestamp to struct tm */
+
+		if ( (date_tm=gmtime(&date_value)) != NULL ) {
+			/* Extract the date part */
+			part_value = ext_date_part_extract
+				(strlist->date_part, date_tm, wanted_zone);
+		}
+	}
+
+	strlist->read = TRUE;
+
+	if ( part_value == NULL )
+		return 0;
+
+	*str_r = t_str_new_const(part_value, strlen(part_value));
+	return 1;
+}
+
+static void ext_date_stringlist_reset
+(struct sieve_stringlist *_strlist)
+{
+	struct ext_date_stringlist *strlist =
+		(struct ext_date_stringlist *) _strlist;
+
+	if ( strlist->field_values != NULL )
+		sieve_stringlist_reset(strlist->field_values);
+	strlist->read = FALSE;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/date/ext-date-common.h b/pigeonhole/src/lib-sieve/plugins/date/ext-date-common.h
new file mode 100644
index 0000000..116af3e
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/date/ext-date-common.h
@@ -0,0 +1,80 @@
+#ifndef EXT_DATE_COMMON_H
+#define EXT_DATE_COMMON_H
+
+#include "sieve-common.h"
+
+#include <time.h>
+
+/*
+ * Extension
+ */
+
+extern const struct sieve_extension_def date_extension;
+
+bool ext_date_interpreter_load
+	(const struct sieve_extension *ext, const struct sieve_runtime_env *renv,
+		sieve_size_t *address ATTR_UNUSED);
+
+/*
+ * Tests
+ */
+
+extern const struct sieve_command_def date_test;
+extern const struct sieve_command_def currentdate_test;
+
+/*
+ * Operations
+ */
+
+enum ext_date_opcode {
+	EXT_DATE_OPERATION_DATE,
+	EXT_DATE_OPERATION_CURRENTDATE
+};
+
+extern const struct sieve_operation_def date_operation;
+extern const struct sieve_operation_def currentdate_operation;
+
+/*
+ * Zone string
+ */
+
+bool ext_date_parse_timezone(const char *zone, int *zone_offset_r);
+
+/*
+ * Current date
+ */
+
+time_t ext_date_get_current_date
+	(const struct sieve_runtime_env *renv, int *zone_offset_r);
+
+/*
+ * Date part
+ */
+
+struct ext_date_part {
+	const char *identifier;
+
+	const char *(*get_string)(struct tm *tm, int zone_offset);
+};
+
+const struct ext_date_part *ext_date_part_find(const char *part);
+
+const char *ext_date_part_extract
+	(const struct ext_date_part *dpart, struct tm *tm, int zone_offset);
+
+/*
+ * Date stringlist
+ */
+
+enum ext_date_timezone_special {
+	EXT_DATE_TIMEZONE_LOCAL    = 100,
+	EXT_DATE_TIMEZONE_ORIGINAL = 101
+};
+
+struct sieve_stringlist *ext_date_stringlist_create
+(const struct sieve_runtime_env *renv, struct sieve_stringlist *field_values,
+	int time_zone, const struct ext_date_part *dpart);
+
+
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/date/ext-date.c b/pigeonhole/src/lib-sieve/plugins/date/ext-date.c
new file mode 100644
index 0000000..3880d82
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/date/ext-date.c
@@ -0,0 +1,62 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension date
+ * ------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 5260
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "lib.h"
+#include "array.h"
+
+#include "sieve-common.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-address-parts.h"
+
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-binary.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "ext-date-common.h"
+
+/*
+ * Extension
+ */
+
+static bool ext_date_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *validator);
+
+const struct sieve_operation_def *ext_date_operations[] = {
+	&date_operation,
+	&currentdate_operation
+};
+
+const struct sieve_extension_def date_extension = {
+	.name = "date",
+	.validator_load = ext_date_validator_load,
+	.interpreter_load = ext_date_interpreter_load,
+	SIEVE_EXT_DEFINE_OPERATIONS(ext_date_operations)
+};
+
+static bool ext_date_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	/* Register new test */
+	sieve_validator_register_command(valdtr, ext, &date_test);
+	sieve_validator_register_command(valdtr, ext, &currentdate_test);
+
+	return TRUE;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/date/tst-date.c b/pigeonhole/src/lib-sieve/plugins/date/tst-date.c
new file mode 100644
index 0000000..60ee92c
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/date/tst-date.c
@@ -0,0 +1,496 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-address-parts.h"
+#include "sieve-message.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-match.h"
+
+#include "ext-date-common.h"
+
+#include <time.h>
+
+/*
+ * Tests
+ */
+
+static bool tst_date_validate
+	(struct sieve_validator *valdtr, struct sieve_command *tst);
+static bool tst_date_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx);
+
+/* Date test
+ *
+ * Syntax:
+ *    date [<":zone" <time-zone: string>> / ":originalzone"]
+ *         [COMPARATOR] [MATCH-TYPE] <header-name: string>
+ *         <date-part: string> <key-list: string-list>
+ */
+
+static bool tst_date_registered
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+
+const struct sieve_command_def date_test = {
+	.identifier = "date",
+	.type = SCT_TEST,
+	.positional_args = 3,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = tst_date_registered,
+	.validate = tst_date_validate,
+	.generate = tst_date_generate
+};
+
+/* Currentdate test
+ *
+ * Syntax:
+ *    currentdate [":zone" <time-zone: string>]
+ *                [COMPARATOR] [MATCH-TYPE]
+ *                <date-part: string> <key-list: string-list>
+ */
+
+static bool tst_currentdate_registered
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+
+const struct sieve_command_def currentdate_test = {
+	.identifier = "currentdate",
+	.type = SCT_TEST,
+	.positional_args = 2,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = tst_currentdate_registered,
+	.validate = tst_date_validate,
+	.generate = tst_date_generate
+};
+
+/*
+ * Tagged arguments
+ */
+
+/* Forward declarations */
+
+static bool tag_zone_validate
+	(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *cmd);
+static bool tag_zone_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+		struct sieve_command *cmd);
+
+/* Argument objects */
+
+static const struct sieve_argument_def date_zone_tag = {
+ 	.identifier = "zone",
+	.validate = tag_zone_validate,
+	.generate = tag_zone_generate
+};
+
+static const struct sieve_argument_def date_originalzone_tag = {
+	.identifier = "originalzone",
+	.validate = tag_zone_validate,
+	.generate = tag_zone_generate
+};
+
+/*
+ * Date operation
+ */
+
+static bool tst_date_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int tst_date_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def date_operation = {
+	.mnemonic = "DATE",
+	.ext_def = &date_extension,
+	.code = EXT_DATE_OPERATION_DATE,
+	.dump = tst_date_operation_dump,
+	.execute = tst_date_operation_execute
+};
+
+const struct sieve_operation_def currentdate_operation = {
+	.mnemonic = "CURRENTDATE",
+	.ext_def = &date_extension,
+	.code = EXT_DATE_OPERATION_CURRENTDATE,
+	.dump = tst_date_operation_dump,
+	.execute = tst_date_operation_execute
+};
+
+/*
+ * Optional operands
+ */
+
+enum tst_date_optional {
+	OPT_DATE_ZONE = SIEVE_AM_OPT_LAST,
+	OPT_DATE_LAST
+};
+
+/*
+ * Tag implementation
+ */
+
+static bool tag_zone_validate
+(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+    struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+
+	if ( (bool) cmd->data ) {
+		if ( sieve_command_is(cmd, date_test) ) {
+			sieve_argument_validate_error(valdtr, *arg,
+				"multiple :zone or :originalzone arguments specified for "
+				"the currentdate test");
+		} else {
+			sieve_argument_validate_error(valdtr, *arg,
+				"multiple :zone arguments specified for the currentdate test");
+		}
+		return FALSE;
+	}
+
+	/* Skip tag */
+ 	*arg = sieve_ast_argument_next(*arg);
+
+	/* :content tag has a string-list argument */
+	if ( sieve_argument_is(tag, date_zone_tag) ) {
+
+		/* Check syntax:
+		 *   :zone <time-zone: string>
+		 */
+		if ( !sieve_validate_tag_parameter
+			(valdtr, cmd, tag, *arg, NULL, 0, SAAT_STRING, FALSE) ) {
+			return FALSE;
+		}
+
+		/* Check it */
+		if ( sieve_argument_is_string_literal(*arg) ) {
+			const char *zone = sieve_ast_argument_strc(*arg);
+
+			if ( !ext_date_parse_timezone(zone, NULL) ) {
+				sieve_argument_validate_warning(valdtr, *arg,
+					"specified :zone argument '%s' is not a valid timezone",
+					str_sanitize(zone, 40));
+			}
+		}
+
+		/* Assign tag parameters */
+		tag->parameters = *arg;
+		*arg = sieve_ast_arguments_detach(*arg,1);
+	}
+
+	cmd->data = (void *) TRUE;
+
+	return TRUE;
+}
+
+/*
+ * Test registration
+ */
+
+static bool tst_date_registered
+(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+	struct sieve_command_registration *cmd_reg)
+{
+	sieve_comparators_link_tag(valdtr, cmd_reg, SIEVE_MATCH_OPT_COMPARATOR);
+	sieve_match_types_link_tags(valdtr, cmd_reg, SIEVE_MATCH_OPT_MATCH_TYPE);
+
+	sieve_validator_register_tag
+		(valdtr, cmd_reg, ext, &date_zone_tag, OPT_DATE_ZONE);
+	sieve_validator_register_tag
+		(valdtr, cmd_reg, ext, &date_originalzone_tag, OPT_DATE_ZONE);
+
+	return TRUE;
+}
+
+static bool tst_currentdate_registered
+(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+	struct sieve_command_registration *cmd_reg)
+{
+	sieve_comparators_link_tag(valdtr, cmd_reg, SIEVE_MATCH_OPT_COMPARATOR);
+	sieve_match_types_link_tags(valdtr, cmd_reg, SIEVE_MATCH_OPT_MATCH_TYPE);
+
+	sieve_validator_register_tag
+		(valdtr, cmd_reg, ext, &date_zone_tag, OPT_DATE_ZONE);
+
+	return TRUE;
+}
+
+/*
+ * Validation
+ */
+
+static bool tst_date_validate
+(struct sieve_validator *valdtr, struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+	unsigned int arg_offset = 0 ;
+	const struct sieve_match_type mcht_default =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	const struct sieve_comparator cmp_default =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+
+	/* Check header name */
+
+	if ( sieve_command_is(tst, date_test) ) {
+		arg_offset = 1;
+
+		if ( !sieve_validate_positional_argument
+			(valdtr, tst, arg, "header name", 1, SAAT_STRING) ) {
+			return FALSE;
+		}
+
+		if ( !sieve_validator_argument_activate(valdtr, tst, arg, FALSE) )
+			return FALSE;
+
+		if ( !sieve_command_verify_headers_argument(valdtr, arg) )
+			return FALSE;
+
+		arg = sieve_ast_argument_next(arg);
+	}
+
+	/* Check date part */
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "date part", arg_offset + 1, SAAT_STRING) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, tst, arg, FALSE) )
+		return FALSE;
+
+	if ( sieve_argument_is_string_literal(arg) ) {
+		const char * part = sieve_ast_argument_strc(arg);
+
+		if ( ext_date_part_find(part) == NULL ) {
+			sieve_argument_validate_warning
+				(valdtr, arg, "specified date part `%s' is not known",
+					str_sanitize(part, 80));
+		}
+	}
+
+	arg = sieve_ast_argument_next(arg);
+
+	/* Check key list */
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "key list", arg_offset + 2, SAAT_STRING_LIST) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, tst, arg, FALSE) )
+		return FALSE;
+
+	/* Validate the key argument to a specified match type */
+	return sieve_match_type_validate
+		(valdtr, tst, arg, &mcht_default, &cmp_default);
+}
+
+/*
+ * Code generation
+ */
+
+static bool tst_date_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *tst)
+{
+	if ( sieve_command_is(tst, date_test) )
+		sieve_operation_emit(cgenv->sblock, tst->ext, &date_operation);
+	else if ( sieve_command_is(tst, currentdate_test) )
+		sieve_operation_emit(cgenv->sblock, tst->ext, &currentdate_operation);
+	else
+		i_unreached();
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, tst, NULL);
+}
+
+static bool tag_zone_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+    struct sieve_command *cmd)
+{
+	if ( arg->parameters == NULL ) {
+		sieve_opr_omitted_emit(cgenv->sblock);
+		return TRUE;
+	}
+
+	return sieve_generate_argument_parameters(cgenv, cmd, arg);
+}
+
+/*
+ * Code dump
+ */
+
+static bool tst_date_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	int opt_code = 0;
+	const struct sieve_operation *op = denv->oprtn;
+
+	sieve_code_dumpf(denv, "%s", sieve_operation_mnemonic(op));
+	sieve_code_descend(denv);
+
+	/* Handle any optional arguments */
+	for (;;) {
+		int opt;
+
+		if ( (opt=sieve_message_opr_optional_dump(denv, address, &opt_code)) < 0 )
+			return FALSE;
+
+		if ( opt == 0 ) break;
+
+		switch ( opt_code ) {
+		case OPT_DATE_ZONE:
+			if ( !sieve_opr_string_dump_ex(denv, address, "zone", "ORIGINAL") )
+				return FALSE;
+			break;
+		default:
+			return FALSE;
+		}
+	}
+
+	if ( sieve_operation_is(op, date_operation) &&
+		!sieve_opr_string_dump(denv, address, "header name") )
+		return FALSE;
+
+	return
+		sieve_opr_string_dump(denv, address, "date part") &&
+		sieve_opr_stringlist_dump(denv, address, "key list");
+}
+
+
+/*
+ * Code execution
+ */
+
+static int tst_date_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	const struct sieve_operation *op = renv->oprtn;
+	int opt_code = 0;
+	struct sieve_match_type mcht =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	struct sieve_comparator cmp =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+	ARRAY_TYPE(sieve_message_override) svmos;
+	string_t *date_part = NULL, *zone = NULL;
+	struct sieve_stringlist *hdr_list = NULL, *hdr_value_list;
+	struct sieve_stringlist *value_list, *key_list;
+	bool zone_specified = FALSE, zone_literal = TRUE;
+	const struct ext_date_part *dpart;
+	int time_zone;
+	int match, ret;
+
+	/* Read optional operands */
+	for (;;) {
+		int opt;
+
+		/* Optional operands */
+		i_zero(&svmos);
+		if ( (opt=sieve_message_opr_optional_read
+			(renv, address, &opt_code, &ret, NULL, &mcht, &cmp, &svmos)) < 0 )
+			return ret;
+
+		if ( opt == 0 ) break;
+
+		switch ( opt_code ) {
+		case OPT_DATE_ZONE:
+			if ( (ret=sieve_opr_string_read_ex
+				(renv, address, "zone", TRUE, &zone, &zone_literal)) <= 0 )
+				return ret;
+
+			zone_specified = TRUE;
+			break;
+		default:
+			sieve_runtime_trace_error(renv, "unknown optional operand");
+			return SIEVE_EXEC_BIN_CORRUPT;
+		}
+	}
+
+	if ( sieve_operation_is(op, date_operation) ) {
+		/* Read header name as stringlist */
+		if ( (ret=sieve_opr_stringlist_read
+			(renv, address, "header-name", &hdr_list)) <= 0 )
+			return ret;
+	}
+
+	/* Read date part */
+	if ( (ret=sieve_opr_string_read(renv, address, "date-part", &date_part))
+		<= 0 )
+		return ret;
+
+	/* Read key-list */
+	if ( (ret=sieve_opr_stringlist_read(renv, address, "key-list", &key_list))
+		<= 0 )
+		return ret;
+
+	/* Determine what time zone to use in the result */
+	if ( !zone_specified ) {
+		time_zone = EXT_DATE_TIMEZONE_LOCAL;
+	} else if ( zone == NULL ) {
+		time_zone = EXT_DATE_TIMEZONE_ORIGINAL;
+	} else if ( !ext_date_parse_timezone(str_c(zone), &time_zone) ) {
+		if ( !zone_literal )
+			sieve_runtime_warning(renv, NULL,
+				"specified :zone argument `%s' is not a valid timezone "
+				"(using local zone)", str_sanitize(str_c(zone), 40));
+		time_zone = EXT_DATE_TIMEZONE_LOCAL;
+	}
+
+	if ( (dpart=ext_date_part_find(str_c(date_part))) == NULL ) {
+		sieve_runtime_warning(renv, NULL,
+			"specified date part argument `%s' is not known",
+			str_sanitize(str_c(date_part), 40));
+		sieve_interpreter_set_test_result(renv->interp, FALSE);
+		return SIEVE_EXEC_OK;
+	}
+
+	/*
+	 * Perform test
+	 */
+
+	if ( sieve_operation_is(op, date_operation) ) {
+
+		sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS, "date test");
+
+		/* Get header */
+		sieve_runtime_trace_descend(renv);
+		if ( (ret=sieve_message_get_header_fields
+			(renv, hdr_list, &svmos, FALSE, &hdr_value_list)) <= 0 )
+			return ret;
+		sieve_runtime_trace_ascend(renv);
+
+		/* Create value stringlist */
+		value_list = ext_date_stringlist_create
+			(renv, hdr_value_list, time_zone, dpart);
+
+	} else if ( sieve_operation_is(op, currentdate_operation) ) {
+		/* Use time stamp recorded at the time the script first started */
+
+		sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS, "currentdatedate test");
+
+		/* Create value stringlist */
+		value_list = ext_date_stringlist_create(renv, NULL, time_zone, dpart);
+	} else {
+		i_unreached();
+	}
+
+	/* Perform match */
+	if ( (match=sieve_match(renv, &mcht, &cmp, value_list, key_list, &ret)) < 0 )
+		return ret;
+
+	/* Set test result for subsequent conditional jump */
+	sieve_interpreter_set_test_result(renv->interp, match > 0);
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/duplicate/Makefile.am b/pigeonhole/src/lib-sieve/plugins/duplicate/Makefile.am
new file mode 100644
index 0000000..7469b98
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/duplicate/Makefile.am
@@ -0,0 +1,20 @@
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+
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+	-I$(srcdir)/../.. \
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+
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+	tst-duplicate.c
+
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+	ext-duplicate.c
+
+libsieve_ext_duplicate_la_SOURCES = \
+	$(tests) \
+	$(extensions) \
+	ext-duplicate-common.c
+
+noinst_HEADERS = \
+	ext-duplicate-common.h
+
diff --git a/pigeonhole/src/lib-sieve/plugins/duplicate/Makefile.in b/pigeonhole/src/lib-sieve/plugins/duplicate/Makefile.in
new file mode 100644
index 0000000..d29f834
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/duplicate/Makefile.in
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+
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+	$(tests) \
+	$(extensions) \
+	ext-duplicate-common.c
+
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+	ext-duplicate-common.h
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+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
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+	      exit 1;; \
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+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/lib-sieve/plugins/duplicate/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
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+	  *config.status*) \
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+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
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+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+
+clean-noinstLTLIBRARIES:
+	-test -z "$(noinst_LTLIBRARIES)" || rm -f $(noinst_LTLIBRARIES)
+	@list='$(noinst_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+libsieve_ext_duplicate.la: $(libsieve_ext_duplicate_la_OBJECTS) $(libsieve_ext_duplicate_la_DEPENDENCIES) $(EXTRA_libsieve_ext_duplicate_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(LINK)  $(libsieve_ext_duplicate_la_OBJECTS) $(libsieve_ext_duplicate_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-duplicate-common.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-duplicate.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/tst-duplicate.Plo@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
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+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
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+am--depfiles: $(am__depfiles_remade)
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+.c.o:
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+.c.lo:
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+	  test -n "$$unique" || unique=$$empty_fix; \
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+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
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+
+CTAGS: ctags
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+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
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+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
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+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
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+distclean-tags:
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+distdir-am: $(DISTFILES)
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
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+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
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+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
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+
+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	mostlyclean-am
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+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/ext-duplicate-common.Plo
+	-rm -f ./$(DEPDIR)/ext-duplicate.Plo
+	-rm -f ./$(DEPDIR)/tst-duplicate.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
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+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/ext-duplicate-common.Plo
+	-rm -f ./$(DEPDIR)/ext-duplicate.Plo
+	-rm -f ./$(DEPDIR)/tst-duplicate.Plo
+	-rm -f Makefile
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+	mostlyclean-libtool
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+.MAKE: install-am install-strip
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+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
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+	install-info install-info-am install-man install-pdf \
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+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/duplicate/ext-duplicate-common.c b/pigeonhole/src/lib-sieve/plugins/duplicate/ext-duplicate-common.c
new file mode 100644
index 0000000..5af7e04
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/duplicate/ext-duplicate-common.c
@@ -0,0 +1,298 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "md5.h"
+#include "ioloop.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "array.h"
+
+#include "sieve-common.h"
+#include "sieve-settings.h"
+#include "sieve-error.h"
+#include "sieve-extensions.h"
+#include "sieve-message.h"
+#include "sieve-code.h"
+#include "sieve-runtime.h"
+#include "sieve-interpreter.h"
+#include "sieve-actions.h"
+#include "sieve-result.h"
+
+#include "ext-duplicate-common.h"
+
+/*
+ * Extension configuration
+ */
+
+#define EXT_DUPLICATE_DEFAULT_PERIOD (12*60*60)
+#define EXT_DUPLICATE_DEFAULT_MAX_PERIOD (2*24*60*60)
+
+bool ext_duplicate_load(const struct sieve_extension *ext, void **context)
+{
+	struct sieve_instance *svinst = ext->svinst;
+	struct ext_duplicate_config *config;
+	sieve_number_t default_period, max_period;
+
+	if (*context != NULL)
+		ext_duplicate_unload(ext);
+
+	if (!sieve_setting_get_duration_value(
+		svinst, "sieve_duplicate_default_period", &default_period))
+		default_period = EXT_DUPLICATE_DEFAULT_PERIOD;
+	if (!sieve_setting_get_duration_value(
+		svinst, "sieve_duplicate_max_period", &max_period)) {
+		max_period = EXT_DUPLICATE_DEFAULT_MAX_PERIOD;
+	}
+
+	config = i_new(struct ext_duplicate_config, 1);
+	config->default_period = default_period;
+	config->max_period = max_period;
+
+	*context = (void *) config;
+	return TRUE;
+}
+
+void ext_duplicate_unload(const struct sieve_extension *ext)
+{
+	struct ext_duplicate_config *config =
+		(struct ext_duplicate_config *)ext->context;
+
+	i_free(config);
+}
+
+/*
+ * Duplicate_mark action
+ */
+
+struct act_duplicate_mark_data {
+	const char *handle;
+	unsigned int period;
+	unsigned char hash[MD5_RESULTLEN];
+	bool last:1;
+};
+
+static void
+act_duplicate_mark_print(const struct sieve_action *action,
+			 const struct sieve_result_print_env *rpenv,
+			 bool *keep);
+static void
+act_duplicate_mark_finish(const struct sieve_action_exec_env *aenv,
+			  void *tr_context, int status);
+
+static const struct sieve_action_def act_duplicate_mark = {
+	.name = "duplicate_mark",
+	.print = act_duplicate_mark_print,
+	.finish = act_duplicate_mark_finish
+};
+
+static void
+act_duplicate_mark_print(const struct sieve_action *action,
+			 const struct sieve_result_print_env *rpenv,
+			 bool *keep ATTR_UNUSED)
+{
+	struct act_duplicate_mark_data *data =
+		(struct act_duplicate_mark_data *)action->context;
+	const char *last = (data->last ? " last" : "");
+
+	if (data->handle != NULL) {
+		sieve_result_action_printf(
+			rpenv, "track%s duplicate with handle: %s",
+			last, str_sanitize(data->handle, 128));
+	} else {
+		sieve_result_action_printf(rpenv, "track%s duplicate", last);
+	}
+}
+
+static void
+act_duplicate_mark_finish(const struct sieve_action_exec_env *aenv,
+			  void *tr_context ATTR_UNUSED, int status)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct act_duplicate_mark_data *data =
+		(struct act_duplicate_mark_data *)aenv->action->context;
+
+	if (status != SIEVE_EXEC_OK) {
+		e_debug(aenv->event, "Not marking duplicate (status=%s)",
+			sieve_execution_exitcode_to_str(status));
+		return;
+	}
+
+	e_debug(aenv->event, "Marking duplicate");
+
+	/* Message was handled successfully, so track duplicate for this
+	 * message.
+	 */
+	eenv->exec_status->significant_action_executed = TRUE;
+	sieve_action_duplicate_mark(aenv, data->hash, sizeof(data->hash),
+				    ioloop_time + data->period);
+}
+
+/*
+ * Duplicate checking
+ */
+
+struct ext_duplicate_handle {
+	const char *handle;
+	bool last:1;
+	bool duplicate:1;
+};
+
+struct ext_duplicate_hash {
+	unsigned char hash[MD5_RESULTLEN];
+	ARRAY(struct ext_duplicate_handle) handles;
+};
+
+struct ext_duplicate_context {
+	ARRAY(struct ext_duplicate_hash) hashes;
+};
+
+static void
+ext_duplicate_hash(string_t *handle, const char *value, size_t value_len,
+		   bool last, unsigned char hash_r[])
+{
+	static const char *id = "sieve duplicate";
+	struct md5_context md5ctx;
+
+	md5_init(&md5ctx);
+	md5_update(&md5ctx, id, strlen(id));
+	if (last)
+		md5_update(&md5ctx, "0", 1);
+	else
+		md5_update(&md5ctx, "+", 1);
+	if (handle != NULL) {
+		md5_update(&md5ctx, "h-", 2);
+		md5_update(&md5ctx, str_c(handle), str_len(handle));
+	} else {
+		md5_update(&md5ctx, "default", 7);
+	}
+	md5_update(&md5ctx, value, value_len);
+	md5_final(&md5ctx, hash_r);
+}
+
+int ext_duplicate_check(const struct sieve_runtime_env *renv, string_t *handle,
+			const char *value, size_t value_len,
+			sieve_number_t period, bool last, bool *duplicate_r)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	const struct sieve_extension *this_ext = renv->oprtn->ext;
+	struct ext_duplicate_context *rctx;
+	bool duplicate = FALSE;
+	pool_t msg_pool = NULL, result_pool = NULL;
+	unsigned char hash[MD5_RESULTLEN];
+	struct ext_duplicate_hash *hash_record = NULL;
+	struct ext_duplicate_handle *handle_record = NULL;
+	struct act_duplicate_mark_data *act;
+	int ret;
+
+	*duplicate_r = FALSE;
+
+	if (!sieve_execute_duplicate_check_available(eenv)) {
+		sieve_runtime_warning(
+			renv, NULL, "duplicate test: "
+			"duplicate checking not available in this context");
+		return SIEVE_EXEC_OK;
+	}
+
+	if (value == NULL)
+		return SIEVE_EXEC_OK;
+
+	/* Create hash */
+	ext_duplicate_hash(handle, value, value_len, last, hash);
+
+	/* Get context; find out whether duplicate was checked earlier */
+	rctx = (struct ext_duplicate_context *)
+		sieve_message_context_extension_get(renv->msgctx, this_ext);
+
+	if (rctx == NULL) {
+		/* Create context */
+		msg_pool = sieve_message_context_pool(renv->msgctx);
+		rctx = p_new(msg_pool, struct ext_duplicate_context, 1);
+		sieve_message_context_extension_set(renv->msgctx, this_ext,
+						    (void *)rctx);
+	} else if (array_is_created(&rctx->hashes)) {
+		struct ext_duplicate_hash *record;
+
+		array_foreach_modifiable(&rctx->hashes, record) {
+			if (memcmp(record->hash, hash, MD5_RESULTLEN) == 0) {
+				hash_record = record;
+				break;
+			}
+		}
+	}
+	if (hash_record != NULL) {
+		const struct ext_duplicate_handle *rhandle;
+		array_foreach(&hash_record->handles, rhandle) {
+			const char *handle_str =
+				(handle == NULL ? NULL : str_c(handle));
+			if (null_strcmp(rhandle->handle, handle_str) == 0 &&
+			    rhandle->last == last)
+				return (rhandle->duplicate ?
+				        SIEVE_DUPLICATE_CHECK_RESULT_EXISTS :
+					SIEVE_DUPLICATE_CHECK_RESULT_NOT_FOUND);
+		}
+	}
+
+	result_pool = sieve_result_pool(renv->result);
+	act = p_new(result_pool, struct act_duplicate_mark_data, 1);
+	if (handle != NULL)
+		act->handle = p_strdup(result_pool, str_c(handle));
+	act->period = period;
+	memcpy(act->hash, hash, MD5_RESULTLEN);
+	act->last = last;
+
+	/* Check duplicate */
+	ret = sieve_execute_duplicate_check(eenv, hash, sizeof(hash),
+					    &duplicate);
+	if (ret >= SIEVE_EXEC_OK && !duplicate && last) {
+		unsigned char no_last_hash[MD5_RESULTLEN];
+
+		/* Check for entry without :last */
+		ext_duplicate_hash(handle, value, value_len,
+				   FALSE, no_last_hash);
+		ret = sieve_execute_duplicate_check(
+			eenv, no_last_hash, sizeof(no_last_hash),
+			&duplicate);
+	}
+	if (ret < SIEVE_EXEC_OK) {
+		sieve_runtime_critical(
+			renv, NULL, "failed to check for duplicate",
+			"failed to check for duplicate%s",
+			(ret == SIEVE_EXEC_TEMP_FAILURE ?
+			 " (temporary failure)" : ""));
+		return ret;
+	}
+
+	/* We may only mark the message as duplicate when Sieve script executes
+	 * successfully; therefore defer this operation until successful result
+	 * execution.
+	 */
+	if (!duplicate || last) {
+		if (sieve_result_add_action(renv, NULL, NULL,
+					    &act_duplicate_mark,
+					    NULL, (void *) act, 0, FALSE) < 0)
+			return SIEVE_EXEC_FAILURE;
+	}
+
+	/* Cache result */
+	if (msg_pool == NULL)
+		msg_pool = sieve_message_context_pool(renv->msgctx);
+	if (hash_record == NULL) {
+		if (!array_is_created(&rctx->hashes))
+			p_array_init(&rctx->hashes, msg_pool, 64);
+		hash_record = array_append_space(&rctx->hashes);
+		memcpy(hash_record->hash, hash, MD5_RESULTLEN);
+		p_array_init(&hash_record->handles, msg_pool, 64);
+	}
+
+	handle_record = array_append_space(&hash_record->handles);
+	if (handle != NULL)
+		handle_record->handle = p_strdup(msg_pool, str_c(handle));
+	handle_record->last = last;
+	handle_record->duplicate = duplicate;
+
+	*duplicate_r = duplicate;
+
+	return SIEVE_EXEC_OK;
+}
+
diff --git a/pigeonhole/src/lib-sieve/plugins/duplicate/ext-duplicate-common.h b/pigeonhole/src/lib-sieve/plugins/duplicate/ext-duplicate-common.h
new file mode 100644
index 0000000..c802b08
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/duplicate/ext-duplicate-common.h
@@ -0,0 +1,41 @@
+#ifndef EXT_DUPLICATE_COMMON_H
+#define EXT_DUPLICATE_COMMON_H
+
+#include "sieve-common.h"
+
+/*
+ * Extension
+ */
+
+struct ext_duplicate_config {
+	unsigned int default_period;
+	unsigned int max_period;
+};
+
+bool ext_duplicate_load(const struct sieve_extension *ext, void **context);
+void ext_duplicate_unload(const struct sieve_extension *ext);
+
+extern const struct sieve_extension_def duplicate_extension;
+extern const struct sieve_extension_def vnd_duplicate_extension;
+
+/*
+ * Tests
+ */
+
+extern const struct sieve_command_def tst_duplicate;
+
+/*
+ * Operations
+ */
+
+extern const struct sieve_operation_def tst_duplicate_operation;
+
+/*
+ * Duplicate checking
+ */
+
+int ext_duplicate_check(const struct sieve_runtime_env *renv, string_t *handle,
+			const char *value, size_t value_len,
+			sieve_number_t period, bool last, bool *duplicate_r);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/duplicate/ext-duplicate.c b/pigeonhole/src/lib-sieve/plugins/duplicate/ext-duplicate.c
new file mode 100644
index 0000000..54de5e5
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/duplicate/ext-duplicate.c
@@ -0,0 +1,107 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension duplicate
+ * -------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: vendor-defined; spec-bosch-sieve-duplicate
+ * Implementation: full
+ * Status: experimental
+ *
+ */
+
+/* Extension vnd.dovecot.duplicate
+ * -------------------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: vendor-defined; spec-bosch-sieve-duplicate
+ * Implementation: full, but deprecated; provided for backwards compatibility
+ * Status: experimental
+ *
+ */
+
+#include "lib.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-binary.h"
+
+#include "sieve-validator.h"
+
+#include "ext-duplicate-common.h"
+
+/*
+ * Extensions
+ */
+
+static bool ext_duplicate_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+
+const struct sieve_extension_def duplicate_extension = {
+	.name = "duplicate",
+	.load = ext_duplicate_load,
+	.unload = ext_duplicate_unload,
+	.validator_load = ext_duplicate_validator_load,
+	SIEVE_EXT_DEFINE_OPERATION(tst_duplicate_operation)
+};
+
+const struct sieve_extension_def vnd_duplicate_extension = {
+	.name = "vnd.dovecot.duplicate",
+	.load = ext_duplicate_load,
+	.unload = ext_duplicate_unload,
+	.validator_load = ext_duplicate_validator_load,
+	SIEVE_EXT_DEFINE_OPERATION(tst_duplicate_operation)
+};
+
+/*
+ * Validation
+ */
+
+static bool ext_duplicate_validator_check_conflict
+	(const struct sieve_extension *ext,
+		struct sieve_validator *valdtr, void *context,
+		struct sieve_ast_argument *require_arg,
+		const struct sieve_extension *ext_other,
+		bool required);
+
+const struct sieve_validator_extension
+duplicate_validator_extension = {
+	.ext = &vnd_duplicate_extension,
+	.check_conflict = ext_duplicate_validator_check_conflict
+};
+
+static bool ext_duplicate_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	/* Register validator extension to check for conflict between
+	   vnd.dovecot.duplicate and duplicate extensions */
+	if ( sieve_extension_is(ext, vnd_duplicate_extension) ) {
+		sieve_validator_extension_register
+			(valdtr, ext, &duplicate_validator_extension, NULL);
+	}
+
+	/* Register duplicate test */
+	sieve_validator_register_command(valdtr, ext, &tst_duplicate);
+
+	return TRUE;
+}
+
+static bool ext_duplicate_validator_check_conflict
+(const struct sieve_extension *ext ATTR_UNUSED,
+	struct sieve_validator *valdtr, void *context ATTR_UNUSED,
+	struct sieve_ast_argument *require_arg,
+	const struct sieve_extension *ext_other,
+	bool required ATTR_UNUSED)
+{
+	/* Check for conflict with duplicate extension */
+	if ( sieve_extension_name_is(ext_other, "duplicate") ) {
+		sieve_argument_validate_error(valdtr, require_arg,
+			"the (deprecated) vnd.dovecot.duplicate extension "
+			"cannot be used together with the duplicate extension");
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
diff --git a/pigeonhole/src/lib-sieve/plugins/duplicate/tst-duplicate.c b/pigeonhole/src/lib-sieve/plugins/duplicate/tst-duplicate.c
new file mode 100644
index 0000000..d211e04
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/duplicate/tst-duplicate.c
@@ -0,0 +1,449 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "mail-storage.h"
+
+#include "sieve-common.h"
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "ext-duplicate-common.h"
+
+/* Duplicate test
+ *
+ * Syntax:
+ *   Usage: "duplicate" [":handle" <handle: string>]
+ *                      [":header" <header-name: string> /
+ *                          ":uniqueid" <value: string>]
+ *                      [":seconds" <timeout: number>] [":last"]
+ */
+
+static bool
+tst_duplicate_registered(struct sieve_validator *valdtr,
+			 const struct sieve_extension *ext,
+			 struct sieve_command_registration *cmd_reg);
+static bool
+tst_duplicate_generate(const struct sieve_codegen_env *cgenv,
+		       struct sieve_command *ctx);
+
+const struct sieve_command_def tst_duplicate = {
+	.identifier = "duplicate",
+	.type = SCT_TEST,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = tst_duplicate_registered,
+	.generate = tst_duplicate_generate
+};
+
+/*
+ * Duplicate test tags
+ */
+
+static bool
+tst_duplicate_validate_number_tag(struct sieve_validator *valdtr,
+				  struct sieve_ast_argument **arg,
+				  struct sieve_command *cmd);
+static bool
+tst_duplicate_validate_string_tag(struct sieve_validator *valdtr,
+				  struct sieve_ast_argument **arg,
+				  struct sieve_command *cmd);
+
+static const struct sieve_argument_def duplicate_seconds_tag = {
+	.identifier = "seconds",
+	.validate = tst_duplicate_validate_number_tag
+};
+
+static const struct sieve_argument_def duplicate_header_tag = {
+	.identifier = "header",
+	.validate = tst_duplicate_validate_string_tag
+};
+
+static const struct sieve_argument_def duplicate_uniqueid_tag = {
+	.identifier = "uniqueid",
+	.validate = tst_duplicate_validate_string_tag
+};
+
+static const struct sieve_argument_def duplicate_value_tag = {
+	.identifier = "value", /* vnd.dovecot.duplicate (deprecated) */
+	.validate = tst_duplicate_validate_string_tag
+};
+
+static const struct sieve_argument_def duplicate_handle_tag = {
+	.identifier = "handle",
+	.validate = tst_duplicate_validate_string_tag
+};
+
+static const struct sieve_argument_def duplicate_last_tag = {
+	.identifier = "last"
+};
+
+/* Codes for optional arguments */
+
+enum tst_duplicate_optional {
+	OPT_END,
+	OPT_SECONDS,
+	OPT_HEADER,
+	OPT_UNIQUEID,
+	OPT_LAST,
+	OPT_HANDLE
+};
+
+/*
+ * Duplicate operation
+ */
+
+static bool
+tst_duplicate_operation_dump(const struct sieve_dumptime_env *denv,
+			     sieve_size_t *address);
+static int
+tst_duplicate_operation_execute(const struct sieve_runtime_env *renv,
+				sieve_size_t *address);
+
+const struct sieve_operation_def tst_duplicate_operation = {
+	.mnemonic = "DUPLICATE",
+	.ext_def = &duplicate_extension,
+	.dump = tst_duplicate_operation_dump,
+	.execute = tst_duplicate_operation_execute
+};
+
+/*
+ * Tag validation
+ */
+
+static bool
+tst_duplicate_validate_number_tag(struct sieve_validator *valdtr,
+				  struct sieve_ast_argument **arg,
+				  struct sieve_command *cmd)
+{
+	const struct sieve_extension *ext = sieve_argument_ext(*arg);
+	const struct ext_duplicate_config *config =
+		(const struct ext_duplicate_config *)ext->context;
+	struct sieve_ast_argument *tag = *arg;
+	sieve_number_t seconds;
+
+	/* Detach the tag itself */
+	*arg = sieve_ast_arguments_detach(*arg,1);
+
+	/* Check syntax:
+	 *   :seconds number
+	 */
+	if (!sieve_validate_tag_parameter(valdtr, cmd, tag, *arg, NULL, 0,
+					  SAAT_NUMBER, FALSE))
+		return FALSE;
+
+	seconds = sieve_ast_argument_number(*arg);
+	/* Enforce :days <= max_period */
+	if (config->max_period > 0 && seconds > config->max_period) {
+		seconds = config->max_period;
+
+		sieve_argument_validate_warning(
+			valdtr, *arg,
+			"specified :seconds value '%llu' is over the maximum",
+			(unsigned long long)seconds);
+	}
+
+	sieve_ast_argument_number_set(*arg, seconds);
+
+	/* Skip parameter */
+	*arg = sieve_ast_argument_next(*arg);
+	return TRUE;
+}
+
+static bool
+tst_duplicate_validate_string_tag(struct sieve_validator *valdtr,
+				  struct sieve_ast_argument **arg,
+				  struct sieve_command *cmd)
+{
+	const struct sieve_extension *ext = cmd->ext;
+	struct sieve_ast_argument *tag = *arg;
+
+	/* Detach the tag itself */
+	*arg = sieve_ast_arguments_detach(*arg,1);
+
+	/* Check syntax:
+	 *   :header <header-name: string>
+	 *   :value <value: string>
+	 *   :handle <handle: string>
+	 */
+	if (!sieve_validate_tag_parameter(valdtr, cmd, tag, *arg, NULL, 0,
+					  SAAT_STRING, FALSE))
+		return FALSE;
+
+	if (!sieve_argument_is(tag, duplicate_handle_tag) && (bool)cmd->data) {
+		sieve_argument_validate_error(
+			valdtr, *arg,
+			"conflicting :header and %s arguments specified "
+			"for the duplicate test",
+			(sieve_extension_is(ext, duplicate_extension) ?
+			 ":uniqueid" : ":value"));
+		return FALSE;
+	}
+
+	/* :header <header-name: string> */
+	if (sieve_argument_is(tag, duplicate_header_tag)) {
+		if (!sieve_command_verify_headers_argument(valdtr, *arg))
+			return FALSE;
+		cmd->data = (void *)TRUE;
+	/* :handle <handle: string> */
+	} else if (sieve_argument_is(tag, duplicate_handle_tag)) {
+		/* nothing to be done */
+	} else if (sieve_argument_is(tag, duplicate_uniqueid_tag)) {
+		i_assert(sieve_extension_is(ext, duplicate_extension));
+		cmd->data = (void *)TRUE;
+	/* :value <value: string> (vnd.dovecot.duplicate) */
+	} else if (sieve_argument_is(tag, duplicate_value_tag)) {
+		i_assert(sieve_extension_is(ext, vnd_duplicate_extension));
+		cmd->data = (void *)TRUE;
+	} else {
+		i_unreached();
+	}
+
+	/* Skip parameter */
+	*arg = sieve_ast_argument_next(*arg);
+	return TRUE;
+}
+
+/*
+ * Command registration
+ */
+
+static bool
+tst_duplicate_registered(struct sieve_validator *valdtr,
+			 const struct sieve_extension *ext,
+			 struct sieve_command_registration *cmd_reg)
+{
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &duplicate_seconds_tag, OPT_SECONDS);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &duplicate_last_tag, OPT_LAST);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &duplicate_header_tag, OPT_HEADER);
+	if (sieve_extension_is(ext, duplicate_extension)) {
+		sieve_validator_register_tag(valdtr, cmd_reg, ext,
+					     &duplicate_uniqueid_tag,
+					     OPT_UNIQUEID);
+	} else {
+		sieve_validator_register_tag(valdtr, cmd_reg, ext,
+					     &duplicate_value_tag,
+					     OPT_UNIQUEID);
+	}
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &duplicate_handle_tag, OPT_HANDLE);
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool
+tst_duplicate_generate(const struct sieve_codegen_env *cgenv,
+		       struct sieve_command *cmd)
+{
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &tst_duplicate_operation);
+
+	if (!sieve_generate_arguments(cgenv, cmd, NULL))
+		return FALSE;
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+tst_duplicate_operation_dump(const struct sieve_dumptime_env *denv,
+			     sieve_size_t *address)
+{
+	const struct sieve_extension *ext = denv->oprtn->ext;
+	int opt_code = 0;
+
+	sieve_code_dumpf(denv, "DUPLICATE");
+	sieve_code_descend(denv);
+
+	/* Dump optional operands */
+
+	for (;;) {
+		int opt;
+		bool opok = TRUE;
+
+		if ((opt = sieve_opr_optional_dump(denv, address,
+						   &opt_code)) < 0)
+			return FALSE;
+
+		if (opt == 0)
+			break;
+
+		switch (opt_code) {
+		case OPT_SECONDS:
+			opok = sieve_opr_number_dump(denv, address, "seconds");
+			break;
+		case OPT_LAST:
+			sieve_code_dumpf(denv, "last");
+			break;
+		case OPT_HEADER:
+			opok = sieve_opr_string_dump(denv, address, "header");
+			break;
+		case OPT_UNIQUEID:
+			if (sieve_extension_is(ext, duplicate_extension)) {
+				opok = sieve_opr_string_dump(denv, address,
+							     "uniqueid");
+			} else {
+				opok = sieve_opr_string_dump(denv, address,
+							     "value");
+			}
+			break;
+		case OPT_HANDLE:
+			opok = sieve_opr_string_dump(denv, address, "handle");
+			break;
+		default:
+			return FALSE;
+		}
+
+		if (!opok)
+			return FALSE;
+	}
+
+	return TRUE;
+}
+
+/*
+ * Code execution
+ */
+
+static int
+tst_duplicate_operation_execute(const struct sieve_runtime_env *renv,
+				sieve_size_t *address ATTR_UNUSED)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	const struct sieve_extension *ext = renv->oprtn->ext;
+	const struct ext_duplicate_config *config =
+		(const struct ext_duplicate_config *)ext->context;
+	struct mail *mail = eenv->msgdata->mail;
+	int opt_code = 0;
+	string_t *handle = NULL, *header = NULL, *uniqueid = NULL;
+	const char *val = NULL;
+	size_t val_len = 0;
+	sieve_number_t seconds = config->default_period;
+	bool last = FALSE, duplicate = FALSE;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Optional operands */
+
+	for (;;) {
+		int opt;
+
+		if ((opt = sieve_opr_optional_read(renv, address,
+						   &opt_code)) < 0)
+			return SIEVE_EXEC_BIN_CORRUPT;
+
+		if (opt == 0)
+			break;
+
+		switch (opt_code) {
+		case OPT_SECONDS:
+			ret = sieve_opr_number_read(renv, address, "seconds",
+						    &seconds);
+			break;
+		case OPT_LAST:
+			last = TRUE;
+			ret = SIEVE_EXEC_OK;
+			break;
+		case OPT_HEADER:
+			ret = sieve_opr_string_read(renv, address, "header",
+						    &header);
+			break;
+		case OPT_UNIQUEID:
+			if (sieve_extension_is(ext, duplicate_extension)) {
+				ret = sieve_opr_string_read(renv, address,
+							    "uniqueid",
+							    &uniqueid);
+			} else {
+				ret = sieve_opr_string_read(renv, address,
+							    "value", &uniqueid);
+			}
+			break;
+		case OPT_HANDLE:
+			ret = sieve_opr_string_read(renv, address,
+						    "handle", &handle);
+			break;
+		default:
+			sieve_runtime_trace_error(
+				renv, "unknown optional operand");
+			ret = SIEVE_EXEC_BIN_CORRUPT;
+		}
+
+		if (ret <= 0)
+			return ret;
+	}
+
+	/*
+	 * Perform operation
+	 */
+
+	/* Trace */
+	sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS, "duplicate test");
+	sieve_runtime_trace_descend(renv);
+
+	/* Get value */
+	if (uniqueid != NULL) {
+		val = str_c(uniqueid);
+		val_len = str_len(uniqueid);
+	} else {
+		if (header == NULL) {
+			ret = mail_get_message_id(mail, &val);
+			if (ret < 0) {
+				return sieve_runtime_mail_error(
+					renv, mail, "duplicate test: "
+					"failed to read header field `message-id'");
+			}
+		} else {
+			ret = mail_get_first_header_utf8(mail, str_c(header),
+							 &val);
+			if (ret < 0) {
+				return sieve_runtime_mail_error(
+					renv, mail, "duplicate test: "
+					"failed to read header field `%s'",
+					str_c(header));
+			}
+		}
+
+		if (ret > 0)
+			val_len = strlen(val);
+	}
+
+	/* Check duplicate */
+	if (val == NULL) {
+		duplicate = FALSE;
+	} else {
+		ret = ext_duplicate_check(renv, handle, val, val_len,
+					  seconds, last, &duplicate);
+		if (ret < SIEVE_EXEC_OK)
+			return ret;
+	}
+
+	/* Trace */
+	if (duplicate) {
+		sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+				    "message is a duplicate");
+	}	else {
+		sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+				    "message is not a duplicate");
+	}
+
+	/* Set test result for subsequent conditional jump */
+	sieve_interpreter_set_test_result(renv->interp, duplicate);
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/editheader/Makefile.am b/pigeonhole/src/lib-sieve/plugins/editheader/Makefile.am
new file mode 100644
index 0000000..6824ec0
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/editheader/Makefile.am
@@ -0,0 +1,19 @@
+noinst_LTLIBRARIES = libsieve_ext_editheader.la
+
+AM_CPPFLAGS = \
+	-I$(srcdir)/../.. \
+	-I$(srcdir)/../../util \
+	$(LIBDOVECOT_INCLUDE)
+
+commands = \
+	cmd-addheader.c \
+	cmd-deleteheader.c
+
+libsieve_ext_editheader_la_SOURCES = \
+	$(commands) \
+	ext-editheader.c \
+	ext-editheader-common.c
+
+noinst_HEADERS = \
+	ext-editheader-limits.h \
+	ext-editheader-common.h
diff --git a/pigeonhole/src/lib-sieve/plugins/editheader/Makefile.in b/pigeonhole/src/lib-sieve/plugins/editheader/Makefile.in
new file mode 100644
index 0000000..75d9571
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/editheader/Makefile.in
@@ -0,0 +1,701 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
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+
+clean-libtool:
+	-rm -rf .libs _libs
+
+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
+tags: tags-am
+TAGS: tags
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+	here=`pwd`; \
+	$(am__define_uniq_tagged_files); \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-am
+
+CTAGS: ctags
+ctags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
+cscopelist: cscopelist-am
+
+cscopelist-am: $(am__tagged_files)
+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(LTLIBRARIES) $(HEADERS)
+installdirs:
+install: install-am
+install-exec: install-exec-am
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+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/cmd-addheader.Plo
+	-rm -f ./$(DEPDIR)/cmd-deleteheader.Plo
+	-rm -f ./$(DEPDIR)/ext-editheader-common.Plo
+	-rm -f ./$(DEPDIR)/ext-editheader.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
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+install-exec-am:
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+install-html: install-html-am
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+
+install-man:
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+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/cmd-addheader.Plo
+	-rm -f ./$(DEPDIR)/cmd-deleteheader.Plo
+	-rm -f ./$(DEPDIR)/ext-editheader-common.Plo
+	-rm -f ./$(DEPDIR)/ext-editheader.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
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+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
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+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/editheader/cmd-addheader.c b/pigeonhole/src/lib-sieve/plugins/editheader/cmd-addheader.c
new file mode 100644
index 0000000..f39cbb7
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/editheader/cmd-addheader.c
@@ -0,0 +1,337 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+#include "mail-storage.h"
+
+#include "rfc2822.h"
+#include "edit-mail.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-message.h"
+
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-binary.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "ext-editheader-common.h"
+
+/*
+ * Addheader command
+ *
+ * Syntax
+ *   "addheader" [":last"] <field-name: string> <value: string>
+ */
+
+static bool cmd_addheader_registered
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+static bool cmd_addheader_validate
+	(struct sieve_validator *valdtr, struct sieve_command *tst);
+static bool cmd_addheader_generate
+	(const struct sieve_codegen_env *cgenv,	struct sieve_command *ctx);
+
+const struct sieve_command_def addheader_command = {
+	.identifier = "addheader",
+	.type = SCT_COMMAND,
+	.positional_args = 2,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = cmd_addheader_registered,
+	.validate = cmd_addheader_validate,
+	.generate = cmd_addheader_generate
+};
+
+/*
+ * Addheader command tags
+ */
+
+/* Argument objects */
+
+static const struct sieve_argument_def addheader_last_tag = {
+	.identifier = "last"
+};
+
+/* Codes for optional arguments */
+
+enum cmd_addheader_optional {
+	OPT_END,
+	OPT_LAST
+};
+
+/*
+ * Addheader operation
+ */
+
+static bool cmd_addheader_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int cmd_addheader_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def addheader_operation = {
+	.mnemonic = "ADDHEADER",
+	.ext_def = &editheader_extension,
+	.code = EXT_EDITHEADER_OPERATION_ADDHEADER,
+	.dump = cmd_addheader_operation_dump,
+	.execute = cmd_addheader_operation_execute
+};
+
+/*
+ * Utility
+ */
+
+static bool _str_contains_nul(const string_t *str)
+{
+	const unsigned char *p, *pend;
+
+	p = str_data(str);
+	pend = p + str_len(str);
+	while (p < pend) {
+		if (*p == '\0')
+			return TRUE;
+		p++;
+	}
+	return FALSE;
+}
+
+/*
+ * Validation
+ */
+
+static bool cmd_addheader_validate
+(struct sieve_validator *valdtr, struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg = cmd->first_positional;
+
+	/* Check field-name syntax */
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, cmd, arg, "field-name", 1, SAAT_STRING) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, cmd, arg, FALSE) )
+		return FALSE;
+
+	if ( sieve_argument_is_string_literal(arg) ) {
+		string_t *fname = sieve_ast_argument_str(arg);
+
+		if ( !rfc2822_header_field_name_verify(str_c(fname), str_len(fname)) ) {
+			sieve_argument_validate_error
+				(valdtr, arg, "addheader command: specified field name `%s' is invalid",
+					str_sanitize(str_c(fname), 80));
+			return FALSE;
+		}
+
+		if ( !ext_editheader_header_allow_add
+			(cmd->ext, str_c(fname)) ) {
+			sieve_argument_validate_warning
+				(valdtr, arg, "addheader command: "
+					"adding specified header field `%s' is forbidden; "
+					"modification will be denied",
+					str_sanitize(str_c(fname), 80));
+		}
+	}
+
+	/* Check value syntax */
+
+	arg = sieve_ast_argument_next(arg);
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, cmd, arg, "value", 2, SAAT_STRING) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, cmd, arg, FALSE) )
+		return FALSE;
+
+	if ( sieve_argument_is_string_literal(arg) ) {
+		string_t *fvalue = sieve_ast_argument_str(arg);
+
+		if ( _str_contains_nul(fvalue) ) {
+			sieve_argument_validate_error(valdtr, arg,
+				"addheader command: specified value `%s' is invalid "
+				"(contains NUL character)",	str_sanitize(str_c(fvalue), 80));
+			return FALSE;
+		}	
+
+		if ( !rfc2822_header_field_body_verify
+			(str_c(fvalue), str_len(fvalue), TRUE, TRUE) ) {
+			sieve_argument_validate_warning(valdtr, arg,
+				"addheader command: specified value `%s' is invalid",
+				str_sanitize(str_c(fvalue), 80));
+		}
+
+		if ( ext_editheader_header_too_large(cmd->ext, str_len(fvalue)) ) {
+			sieve_argument_validate_error(valdtr, arg, "addheader command: "
+				"specified header value `%s' is too large (%zu bytes)",
+				str_sanitize(str_c(fvalue), 80), str_len(fvalue));
+			return SIEVE_EXEC_FAILURE;
+		}
+	}
+
+	return TRUE;
+}
+
+/*
+ * Command registration
+ */
+
+static bool cmd_addheader_registered
+(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+	struct sieve_command_registration *cmd_reg)
+{
+	sieve_validator_register_tag
+		(valdtr, cmd_reg, ext, &addheader_last_tag, OPT_LAST);
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool cmd_addheader_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	(void)sieve_operation_emit(cgenv->sblock, cmd->ext, &addheader_operation);
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, cmd, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool cmd_addheader_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	int opt_code = 0;
+
+	sieve_code_dumpf(denv, "addheader");
+	sieve_code_descend(denv);
+
+	/* Dump optional operands */
+
+	for (;;) {
+		int opt;
+
+		if ( (opt=sieve_opr_optional_dump(denv, address, &opt_code)) < 0 )
+			return FALSE;
+
+		if ( opt == 0 ) break;
+
+		if ( opt_code == OPT_LAST ) {
+			sieve_code_dumpf(denv, "last");
+		} else {
+			return FALSE;
+		}
+	}
+
+	return
+		sieve_opr_string_dump(denv, address, "field-name") &&
+		sieve_opr_string_dump(denv, address, "value");
+}
+
+/*
+ * Interpretation
+ */
+
+static int cmd_addheader_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	const struct sieve_extension *this_ext = renv->oprtn->ext;
+	string_t *field_name;
+	string_t *value;
+	struct edit_mail *edmail;
+	bool last = FALSE;
+	int opt_code = 0;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Optional operands */
+
+	for (;;) {
+		int opt;
+
+		if ( (opt=sieve_opr_optional_read(renv, address, &opt_code)) < 0 )
+			return SIEVE_EXEC_BIN_CORRUPT;
+
+		if ( opt == 0 ) break;
+
+		switch ( opt_code ) {
+		case OPT_LAST:
+			last = TRUE;
+			break;
+		default:
+			sieve_runtime_trace_error(renv, "unknown optional operand");
+			return SIEVE_EXEC_BIN_CORRUPT;
+		}
+	}
+
+	/* Read message */
+
+	if ( (ret=sieve_opr_string_read
+		(renv, address, "field-name", &field_name)) <= 0 )
+		return ret;
+
+	if ( (ret=sieve_opr_string_read
+		(renv, address, "value", &value)) <= 0 )
+		return ret;
+
+	/*
+	 * Verify arguments
+	 */
+
+	if ( !rfc2822_header_field_name_verify
+		(str_c(field_name), str_len(field_name)) ) {
+		sieve_runtime_error(renv, NULL, "addheader action: "
+			"specified field name `%s' is invalid",
+			str_sanitize(str_c(field_name), 80));
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	if ( !ext_editheader_header_allow_add
+		(this_ext, str_c(field_name)) ) {
+		sieve_runtime_warning(renv, NULL, "addheader action: "
+			"adding specified header field `%s' is forbidden; "
+			"modification denied", str_sanitize(str_c(field_name), 80));
+		return SIEVE_EXEC_OK;
+	}
+
+	if ( _str_contains_nul(value) ) {
+		sieve_runtime_error(renv, NULL, "addheader action: "
+			"specified value `%s' is invalid (contains NUL character)",
+			str_sanitize(str_c(value), 80));
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	if ( ext_editheader_header_too_large(this_ext, str_len(value)) ) {
+		sieve_runtime_error(renv, NULL, "addheader action: "
+			"specified header value `%s' is too large (%zu bytes)",
+			str_sanitize(str_c(value), 80), str_len(value));
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	/*
+	 * Perform operation
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS, "addheader \"%s: %s\"",
+		str_sanitize(str_c(field_name), 80), str_sanitize(str_c(value), 80));
+
+	edmail = sieve_message_edit(renv->msgctx);
+	edit_mail_header_add(edmail,
+		rfc2822_header_field_name_sanitize(str_c(field_name)),
+		str_c(value), last);
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/editheader/cmd-deleteheader.c b/pigeonhole/src/lib-sieve/plugins/editheader/cmd-deleteheader.c
new file mode 100644
index 0000000..a6964b7
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/editheader/cmd-deleteheader.c
@@ -0,0 +1,551 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+#include "mail-storage.h"
+
+#include "rfc2822.h"
+#include "edit-mail.h"
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-message.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-match.h"
+
+#include "ext-editheader-common.h"
+
+/*
+ * Deleteheader command
+ *
+ * Syntax:
+ *   deleteheader [":index" <fieldno: number> [":last"]]
+ *                [COMPARATOR] [MATCH-TYPE]
+ *                <field-name: string> [<value-patterns: string-list>]
+ */
+
+static bool cmd_deleteheader_registered
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+static bool cmd_deleteheader_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool cmd_deleteheader_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd);
+
+const struct sieve_command_def deleteheader_command = {
+	.identifier = "deleteheader",
+	.type = SCT_COMMAND,
+	.positional_args = -1, /* We check positional arguments ourselves */
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = cmd_deleteheader_registered,
+	.validate = cmd_deleteheader_validate,
+	.generate = cmd_deleteheader_generate
+};
+
+/*
+ * Deleteheader command tags
+ */
+
+/* Forward declarations */
+
+static bool cmd_deleteheader_validate_index_tag
+	(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *cmd);
+static bool cmd_deleteheader_validate_last_tag
+	(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *cmd);
+
+/* Argument objects */
+
+static const struct sieve_argument_def deleteheader_index_tag = {
+	.identifier = "index",
+	.validate = cmd_deleteheader_validate_index_tag
+};
+
+static const struct sieve_argument_def deleteheader_last_tag = {
+	.identifier = "last",
+	.validate = cmd_deleteheader_validate_last_tag
+};
+
+/* Codes for optional arguments */
+
+enum cmd_deleteheader_optional {
+	OPT_INDEX = SIEVE_MATCH_OPT_LAST,
+	OPT_LAST
+};
+
+/*
+ * Deleteheader operation
+ */
+
+static bool cmd_deleteheader_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int cmd_deleteheader_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def deleteheader_operation = {
+	.mnemonic = "DELETEHEADER",
+	.ext_def = &editheader_extension,
+	.code = EXT_EDITHEADER_OPERATION_DELETEHEADER,
+	.dump = cmd_deleteheader_operation_dump,
+	.execute = cmd_deleteheader_operation_execute
+};
+
+/*
+ * Command registration
+ */
+
+static bool cmd_deleteheader_registered
+(struct sieve_validator *valdtr, const struct sieve_extension *ext ATTR_UNUSED,
+	struct sieve_command_registration *cmd_reg)
+{
+	/* The order of these is not significant */
+	sieve_comparators_link_tag(valdtr, cmd_reg, SIEVE_MATCH_OPT_COMPARATOR);
+	sieve_match_types_link_tags(valdtr, cmd_reg, SIEVE_MATCH_OPT_MATCH_TYPE);
+
+	sieve_validator_register_tag
+		(valdtr, cmd_reg, ext, &deleteheader_index_tag, OPT_INDEX);
+	sieve_validator_register_tag
+		(valdtr, cmd_reg, ext, &deleteheader_last_tag, OPT_LAST);
+
+	return TRUE;
+}
+
+/*
+ * Command validation context
+ */
+
+struct cmd_deleteheader_context_data {
+	struct sieve_ast_argument *arg_index;
+	struct sieve_ast_argument *arg_last;
+};
+
+/*
+ * Tag validation
+ */
+
+static struct cmd_deleteheader_context_data *
+cmd_deleteheader_get_context
+(struct sieve_command *cmd)
+{
+	struct cmd_deleteheader_context_data *ctx_data =
+		(struct cmd_deleteheader_context_data *)cmd->data;
+
+	if ( ctx_data != NULL ) return ctx_data;
+
+	ctx_data = p_new
+		(sieve_command_pool(cmd), struct cmd_deleteheader_context_data, 1);
+	cmd->data = (void *)ctx_data;
+
+	return ctx_data;
+}
+
+static bool cmd_deleteheader_validate_index_tag
+(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+	struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+	struct cmd_deleteheader_context_data *ctx_data;
+	sieve_number_t index;
+
+	/* Detach the tag itself */
+	*arg = sieve_ast_arguments_detach(*arg,1);
+
+	/* Check syntax:
+	 *   :index number
+	 */
+	if ( !sieve_validate_tag_parameter
+		(valdtr, cmd, tag, *arg, NULL, 0, SAAT_NUMBER, FALSE) ) {
+		return FALSE;
+	}
+
+	index = sieve_ast_argument_number(*arg);
+	if ( index > INT_MAX ) {
+		sieve_argument_validate_warning(valdtr, *arg,
+			"the :%s tag for the %s %s has a parameter value '%llu' "
+			"exceeding the maximum (%d)",
+			sieve_argument_identifier(tag), sieve_command_identifier(cmd),
+			sieve_command_type_name(cmd), (unsigned long long) index,
+			INT_MAX);
+		return FALSE;
+	}
+
+	ctx_data = cmd_deleteheader_get_context(cmd);
+	ctx_data->arg_index = *arg;
+
+	/* Skip parameter */
+	*arg = sieve_ast_argument_next(*arg);
+
+	return TRUE;
+}
+
+static bool cmd_deleteheader_validate_last_tag
+(struct sieve_validator *valdtr ATTR_UNUSED, struct sieve_ast_argument **arg,
+	struct sieve_command *cmd)
+{
+	struct cmd_deleteheader_context_data *ctx_data;
+
+	ctx_data = cmd_deleteheader_get_context(cmd);
+	ctx_data->arg_last = *arg;
+
+	/* Skip parameter */
+	*arg = sieve_ast_argument_next(*arg);
+
+	return TRUE;
+}
+
+/*
+ * Validation
+ */
+
+static bool cmd_deleteheader_validate
+(struct sieve_validator *valdtr, struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg = cmd->first_positional;
+	struct cmd_deleteheader_context_data *ctx_data =
+		(struct cmd_deleteheader_context_data *)cmd->data;
+	struct sieve_comparator cmp_default =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+	struct sieve_match_type mcht_default =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+
+	if ( ctx_data != NULL ) {
+		if ( ctx_data->arg_last != NULL && ctx_data->arg_index == NULL ) {
+			sieve_argument_validate_error(valdtr, ctx_data->arg_last,
+				"the :last tag for the %s %s cannot be specified "
+				"without the :index tag",
+				sieve_command_identifier(cmd), sieve_command_type_name(cmd));
+		}
+	}
+
+	/* Field name argument */
+
+	if ( arg == NULL ) {
+		sieve_command_validate_error(valdtr, cmd,
+			"the %s %s expects at least one positional argument, but none was found",
+			sieve_command_identifier(cmd), sieve_command_type_name(cmd));
+		return FALSE;
+	}
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, cmd, arg, "field name", 1, SAAT_STRING_LIST) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, cmd, arg, FALSE) )
+		return FALSE;
+
+	if ( sieve_argument_is_string_literal(arg) ) {
+		string_t *fname = sieve_ast_argument_str(arg);
+
+		if ( !rfc2822_header_field_name_verify(str_c(fname), str_len(fname)) ) {
+			sieve_argument_validate_error(valdtr, arg, "deleteheader command:"
+				"specified field name `%s' is invalid",
+				str_sanitize(str_c(fname), 80));
+			return FALSE;
+		}
+
+		if ( !ext_editheader_header_allow_delete
+			(cmd->ext, str_c(fname)) ) {
+			sieve_argument_validate_warning
+				(valdtr, arg, "deleteheader command: "
+					"deleting specified header field `%s' is forbidden; "
+					"modification will be denied",
+					str_sanitize(str_c(fname), 80));
+		}
+	}
+
+	/* Value patterns argument */
+
+	arg = sieve_ast_argument_next(arg);
+	if ( arg == NULL ) {
+		/* There is none; let's not generate code for useless match arguments */
+		sieve_match_type_arguments_remove(valdtr, cmd);
+
+		return TRUE;
+	}
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, cmd, arg, "value patterns", 2, SAAT_STRING_LIST) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, cmd, arg, FALSE) )
+		return FALSE;
+
+	/* Validate the value patterns to a specified match type */
+	return sieve_match_type_validate
+		(valdtr, cmd, arg, &mcht_default, &cmp_default);
+}
+
+/*
+ * Code generation
+ */
+
+static bool cmd_deleteheader_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &deleteheader_operation);
+
+ 	/* Generate arguments */
+	if ( !sieve_generate_arguments(cgenv, cmd, NULL) )
+		return FALSE;
+
+	/* Emit a placeholder when the value-patterns argument is missing */
+	if ( sieve_ast_argument_next(cmd->first_positional) == NULL )
+		sieve_opr_omitted_emit(cgenv->sblock);
+
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool cmd_deleteheader_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	int opt_code = 0;
+
+	sieve_code_dumpf(denv, "DELETEHEADER");
+	sieve_code_descend(denv);
+
+	/* Optional operands */
+	for (;;) {
+		int opt;
+
+		if ( (opt=sieve_match_opr_optional_dump(denv, address, &opt_code)) < 0 )
+			return FALSE;
+
+		if ( opt == 0 ) break;
+
+		switch ( opt_code ) {
+		case OPT_INDEX:
+			if ( !sieve_opr_number_dump(denv, address, "index") )
+				return FALSE;
+			break;
+		case OPT_LAST:
+			sieve_code_dumpf(denv, "last");
+			break;
+		default:
+			return FALSE;
+		}
+	};
+
+	if ( !sieve_opr_string_dump(denv, address, "field name") )
+		return FALSE;
+
+	return sieve_opr_stringlist_dump_ex(denv, address, "value patterns", "");
+}
+
+/*
+ * Code execution
+ */
+
+static int cmd_deleteheader_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	const struct sieve_extension *this_ext = renv->oprtn->ext;
+	int opt_code = 0;
+	struct sieve_comparator cmp =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+	struct sieve_match_type mcht =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	string_t *field_name;
+	struct sieve_stringlist *vpattern_list = NULL;
+	struct edit_mail *edmail;
+	sieve_number_t index_offset = 0;
+	bool index_last = FALSE;
+	bool trace = FALSE;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	for (;;) {
+		int opt;
+
+		if ( (opt=sieve_match_opr_optional_read
+			(renv, address, &opt_code, &ret, &cmp, &mcht)) < 0 )
+			return ret;
+
+		if ( opt == 0 ) break;
+
+		switch ( opt_code ) {
+		case OPT_INDEX:
+			if ( (ret=sieve_opr_number_read(renv, address, "index", &index_offset))
+				<= 0 )
+				return ret;
+
+			if ( index_offset > INT_MAX ) {
+				sieve_runtime_trace_error(renv, "index is > %d", INT_MAX);
+				return SIEVE_EXEC_BIN_CORRUPT;
+			}
+
+			break;
+		case OPT_LAST:
+			index_last = TRUE;
+			break;
+		default:
+			sieve_runtime_trace_error(renv, "unknown optional operand");
+			return SIEVE_EXEC_BIN_CORRUPT;
+		}
+	}
+
+	/* Read field-name */
+	if ( (ret=sieve_opr_string_read(renv, address, "field-name", &field_name))
+		<= 0 )
+		return ret;
+
+	/* Read value-patterns */
+	if ( (ret=sieve_opr_stringlist_read_ex
+		(renv, address, "value-patterns", TRUE, &vpattern_list)) <= 0 )
+		return ret;
+
+	/*
+	 * Verify arguments
+	 */
+
+	if ( !rfc2822_header_field_name_verify
+		(str_c(field_name), str_len(field_name)) ) {
+		sieve_runtime_error(renv, NULL, "deleteheader action: "
+			"specified field name `%s' is invalid",
+			str_sanitize(str_c(field_name), 80));
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	if ( !ext_editheader_header_allow_delete
+		(this_ext, str_c(field_name)) ) {
+		sieve_runtime_warning(renv, NULL, "deleteheader action: "
+			"deleting specified header field `%s' is forbidden; "
+			"modification denied",
+			str_sanitize(str_c(field_name), 80));
+		return SIEVE_EXEC_OK;
+	}
+
+	/*
+	 * Execute command
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS, "deleteheader command");
+
+	/* Start editing the mail */
+	edmail = sieve_message_edit(renv->msgctx);
+
+	trace = sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS);
+
+	/* Either do string matching or just kill all/indexed notify action(s) */
+	if ( vpattern_list != NULL ) {
+		struct edit_mail_header_iter *edhiter;
+		struct sieve_match_context *mctx;
+
+		if ( trace ) {
+			sieve_runtime_trace_descend(renv);
+			if ( index_offset != 0 ) {
+				sieve_runtime_trace(renv, 0,
+					"deleting matching occurrences of header `%s' at index %llu%s",
+					str_c(field_name), (unsigned long long)index_offset,
+					( index_last ? " from last": ""));
+			} else {
+				sieve_runtime_trace(renv, 0,
+					"deleting matching occurrences of header `%s'", str_c(field_name));
+			}
+		}
+
+		/* Iterate through all headers and delete those that match */
+		if ( (ret=edit_mail_headers_iterate_init
+			(edmail, str_c(field_name), index_last, &edhiter)) > 0 )
+		{
+			int mret = 0;
+			sieve_number_t pos = 0;
+
+			/* Initialize match */
+			mctx = sieve_match_begin(renv, &mcht, &cmp);
+
+			/* Match */
+			for (;;) {
+				pos++;
+
+				/* Check index if any */
+				if ( index_offset == 0 || pos == index_offset ) {
+					const char *value;
+					int match;
+
+					/* Match value against all value patterns */
+					edit_mail_headers_iterate_get(edhiter, &value);
+					if ( (match=sieve_match_value
+						(mctx, value, strlen(value), vpattern_list)) < 0 )
+						break;
+
+					if ( match > 0 ) {
+						/* Remove it and iterate to next */
+						sieve_runtime_trace(renv, 0, "deleting header with value `%s'",
+							value);
+
+						if ( !edit_mail_headers_iterate_remove(edhiter) ) break;
+						continue;
+					}
+				}
+
+				if ( !edit_mail_headers_iterate_next(edhiter) )
+					break;
+			}
+
+			/* Finish match */
+			mret = sieve_match_end(&mctx, &ret);
+
+			edit_mail_headers_iterate_deinit(&edhiter);
+
+			if ( mret < 0 )
+				return ret;
+		}
+
+		if ( ret == 0 ) {
+			sieve_runtime_trace(renv, 0, "header `%s' not found", str_c(field_name));
+		} else if ( ret < 0 ) {
+			sieve_runtime_warning(renv, NULL, "deleteheader action: "
+				"failed to delete occurrences of header `%s' (this should not happen!)",
+				str_c(field_name));
+		}
+
+	} else {
+		int index = ( index_last ? -((int)index_offset) : ((int)index_offset) );
+
+		if ( trace ) {
+			sieve_runtime_trace_descend(renv);
+			if ( index_offset != 0 ) {
+				sieve_runtime_trace(renv, 0, "deleting header `%s' at index %llu%s",
+					str_c(field_name), (unsigned long long)index_offset,
+					( index_last ? " from last": ""));
+			} else {
+				sieve_runtime_trace(renv, 0, "deleting header `%s'", str_c(field_name));
+			}
+		}
+
+		/* Delete all occurrences of header */
+		ret = edit_mail_header_delete(edmail, str_c(field_name), index);
+
+		if ( ret < 0 ) {
+			sieve_runtime_warning(renv, NULL, "deleteheader action: "
+				"failed to delete occurrences of header `%s' (this should not happen!)",
+				str_c(field_name));
+		} else if ( trace ) {
+			sieve_runtime_trace(renv, 0, "deleted %d occurrences of header `%s'",
+				ret, str_c(field_name));
+		}
+
+	}
+
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/editheader/ext-editheader-common.c b/pigeonhole/src/lib-sieve/plugins/editheader/ext-editheader-common.c
new file mode 100644
index 0000000..89fb180
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/editheader/ext-editheader-common.c
@@ -0,0 +1,211 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "mempool.h"
+#include "array.h"
+
+#include "rfc2822.h"
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+#include "sieve-settings.h"
+#include "sieve-extensions.h"
+
+#include "ext-editheader-limits.h"
+#include "ext-editheader-common.h"
+
+/*
+ * Extension configuration
+ */
+
+struct ext_editheader_header {
+	const char *name;
+
+	bool forbid_add:1;
+	bool forbid_delete:1;
+};
+
+struct ext_editheader_config {
+	pool_t pool;
+
+	ARRAY(struct ext_editheader_header) headers;
+
+	size_t max_header_size;
+};
+
+static struct ext_editheader_header *
+ext_editheader_config_header_find(struct ext_editheader_config *ext_config,
+				  const char *hname)
+{
+	struct ext_editheader_header *headers;
+	unsigned int count, i;
+
+	headers = array_get_modifiable(&ext_config->headers, &count);
+	for (i = 0; i < count; i++) {
+		if (strcasecmp(hname, headers[i].name) == 0)
+			return &headers[i];
+	}
+	return NULL;
+}
+
+static void
+ext_editheader_config_headers(struct sieve_instance *svinst,
+			      struct ext_editheader_config *ext_config,
+			      const char *setting, bool forbid_add,
+			      bool forbid_delete)
+{
+	const char *setval;
+
+	setval = sieve_setting_get(svinst, setting);
+	if (setval != NULL) {
+		const char **headers = t_strsplit_spaces(setval, " \t");
+
+		while (*headers != NULL) {
+			struct ext_editheader_header *header;
+
+			if (!rfc2822_header_field_name_verify(
+				*headers, strlen(*headers))) {
+				e_warning(svinst->event, "editheader: "
+					  "setting %s contains invalid header field name "
+					  "`%s' (ignored)",
+					  setting, *headers);
+				headers++;
+				continue;
+			}
+
+			header = ext_editheader_config_header_find(
+				ext_config, *headers);
+			if (header == NULL) {
+				header = array_append_space(
+					&ext_config->headers);
+				header->name = p_strdup(ext_config->pool,
+							*headers);
+			}
+
+			if (forbid_add)
+				header->forbid_add = TRUE;
+			if (forbid_delete)
+				header->forbid_delete = TRUE;
+
+			headers++;
+		}
+	}
+}
+
+bool ext_editheader_load(const struct sieve_extension *ext, void **context)
+{
+	struct ext_editheader_config *ext_config;
+	struct sieve_instance *svinst = ext->svinst;
+	size_t max_header_size;
+	pool_t pool;
+
+	if (*context != NULL) {
+		ext_editheader_unload(ext);
+		*context = NULL;
+	}
+
+	T_BEGIN {
+		pool = pool_alloconly_create("editheader_config", 1024);
+		ext_config = p_new(pool, struct ext_editheader_config, 1);
+		ext_config->pool = pool;
+		ext_config->max_header_size =
+			EXT_EDITHEADER_DEFAULT_MAX_HEADER_SIZE;
+
+		p_array_init(&ext_config->headers, pool, 16);
+
+		ext_editheader_config_headers(
+			svinst, ext_config,
+			"sieve_editheader_protected", TRUE, TRUE);
+		ext_editheader_config_headers(
+			svinst, ext_config,
+			"sieve_editheader_forbid_add", TRUE, FALSE);
+		ext_editheader_config_headers(
+			svinst, ext_config,
+			"sieve_editheader_forbid_delete", FALSE, TRUE);
+
+		if (sieve_setting_get_size_value(
+			svinst, "sieve_editheader_max_header_size",
+			&max_header_size)) {
+			if (max_header_size < EXT_EDITHEADER_MINIMUM_MAX_HEADER_SIZE) {
+				e_warning(svinst->event, "editheader: "
+					  "value of sieve_editheader_max_header_size setting "
+					  "(=%zu) is less than the minimum (=%zu) "
+					  "(ignored)", max_header_size,
+					  (size_t)EXT_EDITHEADER_MINIMUM_MAX_HEADER_SIZE);
+			} else {
+				ext_config->max_header_size = max_header_size;
+			}
+		}
+	} T_END;
+
+	*context = (void *)ext_config;
+	return TRUE;
+}
+
+void ext_editheader_unload(const struct sieve_extension *ext)
+{
+	struct ext_editheader_config *ext_config =
+		(struct ext_editheader_config *)ext->context;
+
+	if (ext_config != NULL)
+		pool_unref(&ext_config->pool);
+}
+
+/*
+ * Protected headers
+ */
+
+bool ext_editheader_header_allow_add(const struct sieve_extension *ext,
+				     const char *hname)
+{
+	struct ext_editheader_config *ext_config =
+		(struct ext_editheader_config *)ext->context;
+	const struct ext_editheader_header *header;
+
+	if (strcasecmp(hname, "subject") == 0)
+		return TRUE;
+	if (strcasecmp(hname, "x-sieve-redirected-from") == 0)
+		return FALSE;
+
+	header = ext_editheader_config_header_find(ext_config, hname);
+	if (header == NULL)
+		return TRUE;
+
+	return !header->forbid_add;
+}
+
+bool ext_editheader_header_allow_delete(const struct sieve_extension *ext,
+					const char *hname)
+{
+	struct ext_editheader_config *ext_config =
+		(struct ext_editheader_config *)ext->context;
+	const struct ext_editheader_header *header;
+
+	if (strcasecmp(hname, "received") == 0 ||
+	    strcasecmp(hname, "auto-submitted") == 0)
+		return FALSE;
+	if (strcasecmp(hname, "x-sieve-redirected-from") == 0)
+		return FALSE;
+	if (strcasecmp(hname, "subject") == 0)
+		return TRUE;
+
+	header = ext_editheader_config_header_find(ext_config, hname);
+	if (header == NULL)
+		return TRUE;
+
+	return !header->forbid_delete;
+}
+
+/*
+ * Limits
+ */
+
+bool ext_editheader_header_too_large(const struct sieve_extension *ext,
+				     size_t size)
+{
+	struct ext_editheader_config *ext_config =
+		(struct ext_editheader_config *)ext->context;
+
+	return size > ext_config->max_header_size;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/editheader/ext-editheader-common.h b/pigeonhole/src/lib-sieve/plugins/editheader/ext-editheader-common.h
new file mode 100644
index 0000000..8a6cc36
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/editheader/ext-editheader-common.h
@@ -0,0 +1,48 @@
+#ifndef EXT_EDITHEADER_COMMON_H
+#define EXT_EDITHEADER_COMMON_H
+
+/*
+ * Commands
+ */
+
+extern const struct sieve_command_def addheader_command;
+extern const struct sieve_command_def deleteheader_command;
+
+/*
+ * Operations
+ */
+
+enum ext_imap4flags_opcode {
+	EXT_EDITHEADER_OPERATION_ADDHEADER,
+	EXT_EDITHEADER_OPERATION_DELETEHEADER,
+};
+
+extern const struct sieve_operation_def addheader_operation;
+extern const struct sieve_operation_def deleteheader_operation;
+
+/*
+ * Extension
+ */
+
+extern const struct sieve_extension_def editheader_extension;
+
+bool ext_editheader_load(const struct sieve_extension *ext, void **context);
+void ext_editheader_unload(const struct sieve_extension *ext);
+
+/*
+ * Protected headers
+ */
+
+bool ext_editheader_header_allow_add(const struct sieve_extension *ext,
+				     const char *hname);
+bool ext_editheader_header_allow_delete(const struct sieve_extension *ext,
+					const char *hname);
+
+/*
+ * Limits
+ */
+
+bool ext_editheader_header_too_large(const struct sieve_extension *ext,
+				     size_t size);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/editheader/ext-editheader-limits.h b/pigeonhole/src/lib-sieve/plugins/editheader/ext-editheader-limits.h
new file mode 100644
index 0000000..a8e834b
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/editheader/ext-editheader-limits.h
@@ -0,0 +1,7 @@
+#ifndef EXT_EDITHEADER_LIMITS_H
+#define EXT_EDITHEADER_LIMITS_H
+
+#define EXT_EDITHEADER_MINIMUM_MAX_HEADER_SIZE  1024
+#define EXT_EDITHEADER_DEFAULT_MAX_HEADER_SIZE  2048
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/editheader/ext-editheader.c b/pigeonhole/src/lib-sieve/plugins/editheader/ext-editheader.c
new file mode 100644
index 0000000..dc8eb12
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/editheader/ext-editheader.c
@@ -0,0 +1,66 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension debug
+ * ---------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 5293
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "lib.h"
+#include "array.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-address-parts.h"
+
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-binary.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "ext-editheader-common.h"
+
+/*
+ * Operations
+ */
+
+const struct sieve_operation_def *editheader_operations[] = {
+	&addheader_operation,
+	&deleteheader_operation
+};
+
+/*
+ * Extension
+ */
+
+static bool ext_editheader_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *validator);
+
+const struct sieve_extension_def editheader_extension = {
+	.name = "editheader",
+	.load = ext_editheader_load,
+	.unload = ext_editheader_unload,
+	.validator_load = ext_editheader_validator_load,
+	SIEVE_EXT_DEFINE_OPERATIONS(editheader_operations)
+};
+
+static bool ext_editheader_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *validator)
+{
+	/* Register new commands */
+	sieve_validator_register_command(validator, ext, &addheader_command);
+	sieve_validator_register_command(validator, ext, &deleteheader_command);
+
+	return TRUE;
+}
+
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/enotify/Makefile.am b/pigeonhole/src/lib-sieve/plugins/enotify/Makefile.am
new file mode 100644
index 0000000..4b65630
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/enotify/Makefile.am
@@ -0,0 +1,44 @@
+SUBDIRS = mailto
+
+noinst_LTLIBRARIES = libsieve_ext_enotify.la
+
+AM_CPPFLAGS = \
+	-I$(srcdir)/../.. \
+	-I$(srcdir)/../variables \
+	$(LIBDOVECOT_INCLUDE)
+
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+	cmd-notify.c
+
+tests = \
+	tst-valid-notify-method.c \
+	tst-notify-method-capability.c
+
+var_modifiers = \
+	vmodf-encodeurl.c
+
+notify_methods = \
+	./mailto/libsieve_ext_enotify_mailto.la
+
+libsieve_ext_enotify_la_DEPENDENCIES = \
+	$(notify_methods)
+libsieve_ext_enotify_la_LIBADD = \
+	$(notify_methods)
+
+libsieve_ext_enotify_la_SOURCES = \
+	ext-enotify.c \
+	ext-enotify-common.c \
+	$(commands) \
+	$(tests) \
+	$(var_modifiers)
+
+public_headers = \
+	sieve-ext-enotify.h
+
+headers = \
+	ext-enotify-limits.h \
+	ext-enotify-common.h
+
+pkginc_libdir=$(dovecot_pkgincludedir)/sieve
+pkginc_lib_HEADERS = $(public_headers)
+noinst_HEADERS = $(headers)
diff --git a/pigeonhole/src/lib-sieve/plugins/enotify/Makefile.in b/pigeonhole/src/lib-sieve/plugins/enotify/Makefile.in
new file mode 100644
index 0000000..fea2423
--- /dev/null
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+	install-pdf install-pdf-am install-pkginc_libHEADERS \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs installdirs-am maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am \
+	uninstall-pkginc_libHEADERS
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/enotify/cmd-notify.c b/pigeonhole/src/lib-sieve/plugins/enotify/cmd-notify.c
new file mode 100644
index 0000000..4fe121a
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/enotify/cmd-notify.c
@@ -0,0 +1,621 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-actions.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-result.h"
+
+#include "ext-enotify-common.h"
+
+/*
+ * Forward declarations
+ */
+
+static const struct sieve_argument_def notify_importance_tag;
+static const struct sieve_argument_def notify_from_tag;
+static const struct sieve_argument_def notify_options_tag;
+static const struct sieve_argument_def notify_message_tag;
+
+/*
+ * Notify command
+ *
+ * Syntax:
+ *    notify [":from" string]
+ *           [":importance" <"1" / "2" / "3">]
+ *           [":options" string-list]
+ *           [":message" string]
+ *           <method: string>
+ */
+
+static bool
+cmd_notify_registered(struct sieve_validator *valdtr,
+		      const struct sieve_extension *ext,
+		      struct sieve_command_registration *cmd_reg);
+static bool
+cmd_notify_pre_validate(struct sieve_validator *validator,
+			struct sieve_command *cmd);
+static bool
+cmd_notify_validate(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool
+cmd_notify_generate(const struct sieve_codegen_env *cgenv,
+		    struct sieve_command *ctx);
+
+const struct sieve_command_def notify_command = {
+	.identifier = "notify",
+	.type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = cmd_notify_registered,
+	.pre_validate = cmd_notify_pre_validate,
+	.validate = cmd_notify_validate,
+	.generate = cmd_notify_generate,
+};
+
+/*
+ * Notify command tags
+ */
+
+/* Forward declarations */
+
+static bool
+cmd_notify_validate_string_tag(struct sieve_validator *valdtr,
+			       struct sieve_ast_argument **arg,
+			       struct sieve_command *cmd);
+static bool
+cmd_notify_validate_stringlist_tag(struct sieve_validator *valdtr,
+				   struct sieve_ast_argument **arg,
+				   struct sieve_command *cmd);
+static bool
+cmd_notify_validate_importance_tag(struct sieve_validator *valdtr,
+				   struct sieve_ast_argument **arg,
+				   struct sieve_command *cmd);
+
+/* Argument objects */
+
+static const struct sieve_argument_def notify_from_tag = {
+	.identifier = "from",
+	.validate = cmd_notify_validate_string_tag
+};
+
+static const struct sieve_argument_def notify_options_tag = {
+	.identifier = "options",
+	.validate = cmd_notify_validate_stringlist_tag
+};
+
+static const struct sieve_argument_def notify_message_tag = {
+	.identifier = "message",
+	.validate = cmd_notify_validate_string_tag
+};
+
+static const struct sieve_argument_def notify_importance_tag = {
+	.identifier = "importance",
+	.validate = cmd_notify_validate_importance_tag
+};
+
+/*
+ * Notify operation
+ */
+
+static bool
+cmd_notify_operation_dump(const struct sieve_dumptime_env *denv,
+			  sieve_size_t *address);
+static int
+cmd_notify_operation_execute(const struct sieve_runtime_env *renv,
+			     sieve_size_t *address);
+
+const struct sieve_operation_def notify_operation = {
+	.mnemonic = "NOTIFY",
+	.ext_def = &enotify_extension,
+	.code = EXT_ENOTIFY_OPERATION_NOTIFY,
+	.dump = cmd_notify_operation_dump,
+	.execute = cmd_notify_operation_execute
+};
+
+/*
+ * Notify action
+ */
+
+/* Forward declarations */
+
+static int
+act_notify_check_duplicate(const struct sieve_runtime_env *renv,
+			   const struct sieve_action *act,
+			   const struct sieve_action *act_other);
+static void
+act_notify_print(const struct sieve_action *action,
+		 const struct sieve_result_print_env *rpenv,
+		 bool *keep);
+static int
+act_notify_commit(const struct sieve_action_exec_env *aenv, void *tr_context);
+
+/* Action object */
+
+const struct sieve_action_def act_notify = {
+	.name = "notify",
+	.check_duplicate =act_notify_check_duplicate,
+	.print = act_notify_print,
+	.commit = act_notify_commit,
+};
+
+/*
+ * Command validation context
+ */
+
+struct cmd_notify_context_data {
+	struct sieve_ast_argument *from;
+	struct sieve_ast_argument *message;
+	struct sieve_ast_argument *options;
+};
+
+/*
+ * Tag validation
+ */
+
+static bool
+cmd_notify_validate_string_tag(struct sieve_validator *valdtr,
+			       struct sieve_ast_argument **arg,
+			       struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+	struct cmd_notify_context_data *ctx_data =
+		(struct cmd_notify_context_data *)cmd->data;
+
+	/* Detach the tag itself */
+	*arg = sieve_ast_arguments_detach(*arg,1);
+
+	/* Check syntax:
+	 *   :from <string>
+	 *   :message <string>
+	 */
+	if (!sieve_validate_tag_parameter(valdtr, cmd, tag, *arg, NULL, 0,
+					  SAAT_STRING, FALSE))
+		return FALSE;
+
+	if (sieve_argument_is(tag, notify_from_tag)) {
+		ctx_data->from = *arg;
+
+		/* Skip parameter */
+		*arg = sieve_ast_argument_next(*arg);
+	} else if (sieve_argument_is(tag, notify_message_tag)) {
+		ctx_data->message = *arg;
+
+		/* Skip parameter */
+		*arg = sieve_ast_argument_next(*arg);
+	}
+	return TRUE;
+}
+
+static bool
+cmd_notify_validate_stringlist_tag(struct sieve_validator *valdtr,
+				   struct sieve_ast_argument **arg,
+				   struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+	struct cmd_notify_context_data *ctx_data =
+		(struct cmd_notify_context_data *)cmd->data;
+
+	/* Detach the tag itself */
+	*arg = sieve_ast_arguments_detach(*arg,1);
+
+	/* Check syntax:
+	 *   :options string-list
+	 */
+	if (!sieve_validate_tag_parameter(valdtr, cmd, tag, *arg, NULL, 0,
+					  SAAT_STRING_LIST, FALSE))
+		return FALSE;
+
+	/* Assign context */
+	ctx_data->options = *arg;
+
+	/* Skip parameter */
+	*arg = sieve_ast_argument_next(*arg);
+
+	return TRUE;
+}
+
+static bool
+cmd_notify_validate_importance_tag(struct sieve_validator *valdtr,
+				   struct sieve_ast_argument **arg,
+				   struct sieve_command *cmd ATTR_UNUSED)
+{
+	const struct sieve_ast_argument *tag = *arg;
+	const char *impstr;
+
+	/* Detach the tag itself */
+	*arg = sieve_ast_arguments_detach(*arg,1);
+
+	/* Check syntax:
+	 *   :importance <"1" / "2" / "3">
+	 */
+	if (sieve_ast_argument_type(*arg) != SAAT_STRING) {
+		/* Not a string */
+		sieve_argument_validate_error(
+			valdtr, *arg,
+			"the :importance tag for the notify command requires a string parameter, "
+			"but %s was found", sieve_ast_argument_name(*arg));
+		return FALSE;
+	}
+
+	impstr = sieve_ast_argument_strc(*arg);
+	if (impstr[0] < '1' || impstr[0]  > '3' || impstr[1] != '\0') {
+		/* Invalid importance */
+		sieve_argument_validate_error(
+			valdtr, *arg,
+			"invalid :importance value for notify command: %s",
+			impstr);
+		return FALSE;
+	}
+
+	sieve_ast_argument_number_substitute(*arg, impstr[0] - '0');
+	(*arg)->argument = sieve_argument_create((*arg)->ast, &number_argument,
+						 tag->argument->ext,
+						 tag->argument->id_code);
+
+	/* Skip parameter */
+	*arg = sieve_ast_argument_next(*arg);
+
+	return TRUE;
+}
+
+/*
+ * Command registration
+ */
+
+static bool
+cmd_notify_registered(struct sieve_validator *valdtr,
+		      const struct sieve_extension *ext,
+		      struct sieve_command_registration *cmd_reg)
+{
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &notify_importance_tag,
+				     CMD_NOTIFY_OPT_IMPORTANCE);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &notify_from_tag, CMD_NOTIFY_OPT_FROM);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &notify_options_tag,
+				     CMD_NOTIFY_OPT_OPTIONS);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &notify_message_tag,
+				     CMD_NOTIFY_OPT_MESSAGE);
+	return TRUE;
+}
+
+/*
+ * Command validation
+ */
+
+static bool
+cmd_notify_pre_validate(struct sieve_validator *validator ATTR_UNUSED,
+			struct sieve_command *cmd)
+{
+	struct cmd_notify_context_data *ctx_data;
+
+	/* Assign context */
+	ctx_data = p_new(sieve_command_pool(cmd),
+			 struct cmd_notify_context_data, 1);
+	cmd->data = ctx_data;
+
+	return TRUE;
+}
+
+static bool
+cmd_notify_validate(struct sieve_validator *valdtr, struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg = cmd->first_positional;
+	struct cmd_notify_context_data *ctx_data =
+		(struct cmd_notify_context_data *)cmd->data;
+
+	if (!sieve_validate_positional_argument(valdtr, cmd, arg, "method", 1,
+						SAAT_STRING))
+		return FALSE;
+
+	if (!sieve_validator_argument_activate(valdtr, cmd, arg, FALSE))
+		return FALSE;
+
+	return ext_enotify_compile_check_arguments(
+		valdtr, cmd, arg, ctx_data->message, ctx_data->from,
+		ctx_data->options);
+}
+
+/*
+ * Code generation
+ */
+
+static bool
+cmd_notify_generate(const struct sieve_codegen_env *cgenv,
+		    struct sieve_command *cmd)
+{
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &notify_operation);
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, cmd, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+cmd_notify_operation_dump(const struct sieve_dumptime_env *denv,
+			  sieve_size_t *address)
+{
+	int opt_code = 0;
+
+	sieve_code_dumpf(denv, "NOTIFY");
+	sieve_code_descend(denv);
+
+	/* Dump optional operands */
+
+	for (;;) {
+		int opt;
+		bool opok = TRUE;
+
+		if ((opt = sieve_opr_optional_dump(denv, address,
+						   &opt_code)) < 0)
+			return FALSE;
+
+		if (opt == 0)
+			break;
+
+		switch (opt_code) {
+		case CMD_NOTIFY_OPT_IMPORTANCE:
+			opok = sieve_opr_number_dump(denv, address,
+						     "importance");
+			break;
+		case CMD_NOTIFY_OPT_FROM:
+			opok = sieve_opr_string_dump(denv, address, "from");
+			break;
+		case CMD_NOTIFY_OPT_OPTIONS:
+			opok = sieve_opr_stringlist_dump(denv, address,
+							 "options");
+			break;
+		case CMD_NOTIFY_OPT_MESSAGE:
+			opok = sieve_opr_string_dump(denv, address, "message");
+			break;
+		default:
+			return FALSE;
+		}
+
+		if (!opok)
+			return FALSE;
+	}
+
+	/* Dump method operand */
+	return sieve_opr_string_dump(denv, address, "method");
+}
+
+/*
+ * Code execution
+ */
+
+static int
+cmd_notify_operation_execute(const struct sieve_runtime_env *renv,
+			     sieve_size_t *address)
+{
+	const struct sieve_extension *this_ext = renv->oprtn->ext;
+	struct sieve_side_effects_list *slist = NULL;
+	struct sieve_enotify_action *act;
+	void *method_context;
+	pool_t pool;
+	int opt_code = 0;
+	sieve_number_t importance = 2;
+	struct sieve_stringlist *options = NULL;
+	const struct sieve_enotify_method *method;
+	string_t *method_uri, *message = NULL, *from = NULL;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Optional operands */
+
+	for (;;) {
+		int opt;
+
+		if ((opt = sieve_opr_optional_read(renv, address,
+						   &opt_code)) < 0)
+			return SIEVE_EXEC_BIN_CORRUPT;
+
+		if (opt == 0) break;
+
+		switch (opt_code) {
+		case CMD_NOTIFY_OPT_IMPORTANCE:
+			ret = sieve_opr_number_read(renv, address, "importance",
+						    &importance);
+			break;
+		case CMD_NOTIFY_OPT_FROM:
+			ret = sieve_opr_string_read(renv, address, "from",
+						    &from);
+			break;
+		case CMD_NOTIFY_OPT_MESSAGE:
+			ret = sieve_opr_string_read(renv, address, "message",
+						    &message);
+			break;
+		case CMD_NOTIFY_OPT_OPTIONS:
+			ret = sieve_opr_stringlist_read(renv, address,
+							"options", &options);
+			break;
+		default:
+			sieve_runtime_trace_error(
+				renv, "unknown optional operand");
+			return SIEVE_EXEC_BIN_CORRUPT;
+		}
+
+		if (ret <= 0)
+			return ret;
+	}
+
+	/* Method operand */
+
+	if ((ret = sieve_opr_string_read(renv, address, "method",
+					 &method_uri)) <= 0)
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	/* Enforce 0 < importance < 4 (just to be sure) */
+
+	if (importance < 1)
+		importance = 1;
+	else if (importance > 3)
+		importance = 3;
+
+	/* Trace */
+
+	if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_ACTIONS)) {
+		sieve_runtime_trace(renv, 0, "notify action");
+		sieve_runtime_trace_descend(renv);
+		sieve_runtime_trace(renv, 0, "notify with uri `%s'",
+				    str_sanitize(str_c(method_uri), 80));
+	}
+
+	/* Check operands */
+
+	if ((ret = ext_enotify_runtime_check_operands(renv, method_uri, message,
+						      from, options, &method,
+						      &method_context)) > 0)
+	{
+		/* Add notify action to the result */
+		pool = sieve_result_pool(renv->result);
+		act = p_new(pool, struct sieve_enotify_action, 1);
+		act->method = method;
+		act->method_context = method_context;
+		act->importance = importance;
+		if (message != NULL)
+			act->message = p_strdup(pool, str_c(message));
+		if (from != NULL)
+			act->from = p_strdup(pool, str_c(from));
+
+		if (sieve_result_add_action(renv, this_ext, "notify",
+					    &act_notify, slist,
+					    (void *)act, 0, FALSE) < 0)
+			return SIEVE_EXEC_FAILURE;
+
+		return SIEVE_EXEC_OK;
+	}
+	return ret;
+}
+
+/*
+ * Action
+ */
+
+/* Runtime verification */
+
+static int
+act_notify_check_duplicate(const struct sieve_runtime_env *renv,
+			   const struct sieve_action *act,
+			   const struct sieve_action *act_other)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	const struct sieve_enotify_action *nact, *nact_other;
+	const struct sieve_enotify_method_def *nmth_def;
+	struct sieve_enotify_env nenv;
+	int result;
+
+	if (act->context == NULL || act_other->context == NULL)
+		return 0;
+
+	nact = (const struct sieve_enotify_action *)act->context;
+	nact_other = (const struct sieve_enotify_action *)act_other->context;
+
+	if (nact->method == NULL || nact->method->def == NULL)
+		return 0;
+
+	nmth_def = nact->method->def;
+	if (nmth_def->action_check_duplicates == NULL)
+		return 0;
+
+	i_zero(&nenv);
+	nenv.svinst = eenv->svinst;
+	nenv.method = nact->method;
+	nenv.ehandler = renv->ehandler;
+	nenv.location = act->location;
+	nenv.event = event_create(nenv.svinst->event);
+	event_set_append_log_prefix(nenv.event, "notify: ");
+
+	result = nmth_def->action_check_duplicates(&nenv, nact, nact_other);
+
+	event_unref(&nenv.event);
+
+	return result;
+}
+
+/* Result printing */
+
+static void
+act_notify_print(const struct sieve_action *action,
+		 const struct sieve_result_print_env *rpenv,
+		 bool *keep ATTR_UNUSED)
+{
+	const struct sieve_enotify_action *act =
+		(const struct sieve_enotify_action *)action->context;
+	const struct sieve_enotify_method *method;
+
+	method = act->method;
+
+	if (method->def != NULL) {
+		sieve_result_action_printf(
+			rpenv, "send notification with method '%s:':",
+			method->def->identifier);
+
+		if (method->def->action_print != NULL) {
+			struct sieve_enotify_print_env penv;
+
+			i_zero(&penv);
+			penv.result_penv = rpenv;
+
+			method->def->action_print(&penv, act);
+		}
+	}
+}
+
+/* Result execution */
+
+static int
+act_notify_commit(const struct sieve_action_exec_env *aenv,
+		  void *tr_context ATTR_UNUSED)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	const struct sieve_enotify_action *act =
+		(const struct sieve_enotify_action *)aenv->action->context;
+	const struct sieve_enotify_method *method = act->method;
+	struct sieve_enotify_exec_env nenv;
+	int ret = 0;
+
+	if (method->def != NULL && method->def->action_execute != NULL)	{
+		/* Compose log structure */
+		i_zero(&nenv);
+		nenv.svinst = eenv->svinst;
+		nenv.flags = eenv->flags;
+		nenv.method = method;
+		nenv.scriptenv = eenv->scriptenv;
+		nenv.msgdata = eenv->msgdata;
+		nenv.msgctx = aenv->msgctx;
+
+		nenv.ehandler = aenv->ehandler;
+		nenv.event = aenv->event;
+
+		ret = method->def->action_execute(&nenv, act);
+		if (ret >= 0)
+			eenv->exec_status->significant_action_executed = TRUE;
+	}
+
+	return (ret >= 0 ? SIEVE_EXEC_OK : SIEVE_EXEC_TEMP_FAILURE);
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/enotify/ext-enotify-common.c b/pigeonhole/src/lib-sieve/plugins/enotify/ext-enotify-common.c
new file mode 100644
index 0000000..e0539f0
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/enotify/ext-enotify-common.c
@@ -0,0 +1,718 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "array.h"
+
+#include "sieve-common.h"
+#include "sieve-ast.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-interpreter.h"
+#include "sieve-result.h"
+
+#include "ext-enotify-limits.h"
+#include "ext-enotify-common.h"
+
+#include <ctype.h>
+
+/* FIXME: (from draft RFC)
+ 
+   Header/envelope tests [Sieve] together with Sieve variables can be used to
+   extract the list of users to receive notifications from the incoming email
+   message or its envelope. This is potentially quite dangerous, as this can be
+   used for Deny Of Service attacks on recipients controlled by the message
+   sender. For this reason implementations SHOULD NOT allow use of variables
+   containing values extracted from the email message in the method parameter to
+   the notify action.  Note that violation of this SHOULD NOT may result in* the
+   creation of an open relay, i.e. any sender would be able to create specially
+   crafted email messages that would result in notifications delivered to
+   recipients under the control of the sender. In worst case this might result
+   in financial loss by user controlling the Sieve script and/or by recipients
+   of notifications (e.g. if a notification is an SMS message).
+
+   --> This is currently not possible to check.
+ */
+
+/*
+ * Notify capability
+ */
+
+static const char *
+ext_notify_get_methods_string(const struct sieve_extension *ntfy_ext);
+
+const struct sieve_extension_capabilities notify_capabilities = {
+	"notify",
+	ext_notify_get_methods_string
+};
+
+/*
+ * Core notification methods
+ */
+
+extern const struct sieve_enotify_method_def mailto_notify;
+
+/*
+ * Notify method registry
+ */
+
+static const struct sieve_enotify_method *
+ext_enotify_method_register(struct sieve_instance *svinst,
+			    struct ext_enotify_context *ectx,
+			    const struct sieve_enotify_method_def *nmth_def)
+{
+	struct sieve_enotify_method *nmth;
+	int nmth_id = (int)array_count(&ectx->notify_methods);
+
+	nmth = array_append_space(&ectx->notify_methods);
+	nmth->def = nmth_def;
+	nmth->id = nmth_id;
+	nmth->svinst = svinst;
+
+	if (nmth_def->load != NULL)
+		nmth_def->load(nmth, &nmth->context);
+
+	return nmth;
+}
+
+void ext_enotify_methods_init(struct sieve_instance *svinst,
+			      struct ext_enotify_context *ectx)
+{
+	p_array_init(&ectx->notify_methods, default_pool, 4);
+
+	ext_enotify_method_register(svinst, ectx, &mailto_notify);
+}
+
+void ext_enotify_methods_deinit(struct ext_enotify_context *ectx)
+{
+	const struct sieve_enotify_method *methods;
+	unsigned int meth_count, i;
+
+	methods = array_get(&ectx->notify_methods, &meth_count);
+	for (i = 0; i < meth_count; i++) {
+		if (methods[i].def != NULL && methods[i].def->unload != NULL)
+			methods[i].def->unload(&methods[i]);
+	}
+
+	array_free(&ectx->notify_methods);
+}
+
+const struct sieve_enotify_method *
+sieve_enotify_method_register(struct sieve_instance *svinst,
+			      const struct sieve_enotify_method_def *nmth_def)
+{
+	const struct sieve_extension *ntfy_ext =
+		sieve_extension_get_by_name(svinst, "enotify");
+
+	if (ntfy_ext != NULL) {
+		struct ext_enotify_context *ectx =
+			(struct ext_enotify_context *) ntfy_ext->context;
+
+		return ext_enotify_method_register(svinst, ectx, nmth_def);
+	}
+	return NULL;
+}
+
+void sieve_enotify_method_unregister(const struct sieve_enotify_method *nmth)
+{
+	struct sieve_instance *svinst = nmth->svinst;
+	const struct sieve_extension *ntfy_ext =
+		sieve_extension_get_by_name(svinst, "enotify");
+
+	if (ntfy_ext != NULL) {
+		struct ext_enotify_context *ectx =
+			(struct ext_enotify_context *) ntfy_ext->context;
+		int nmth_id = nmth->id;
+
+		if (nmth_id >= 0 &&
+		    nmth_id < (int)array_count(&ectx->notify_methods)) {
+			struct sieve_enotify_method *nmth_mod =
+				array_idx_modifiable(&ectx->notify_methods,
+						     nmth_id);
+
+			nmth_mod->def = NULL;
+		}
+	}
+}
+
+const struct sieve_enotify_method *
+ext_enotify_method_find(const struct sieve_extension *ntfy_ext,
+			const char *identifier)
+{
+	struct ext_enotify_context *ectx =
+		(struct ext_enotify_context *)ntfy_ext->context;
+	unsigned int meth_count, i;
+	const struct sieve_enotify_method *methods;
+
+	methods = array_get(&ectx->notify_methods, &meth_count);
+	for (i = 0; i < meth_count; i++) {
+		if (methods[i].def == NULL)
+			continue;
+
+		if (strcasecmp(methods[i].def->identifier, identifier) == 0)
+			return &methods[i];
+	}
+	return NULL;
+}
+
+static const char *
+ext_notify_get_methods_string(const struct sieve_extension *ntfy_ext)
+{
+	struct ext_enotify_context *ectx =
+		(struct ext_enotify_context *) ntfy_ext->context;
+	unsigned int meth_count, i;
+	const struct sieve_enotify_method *methods;
+	string_t *result = t_str_new(128);
+
+	methods = array_get(&ectx->notify_methods, &meth_count);
+	if (meth_count > 0) {
+		for (i = 0; i < meth_count; i++) {
+			if (str_len(result) > 0)
+				str_append_c(result, ' ');
+			if (methods[i].def != NULL)
+				str_append(result, methods[i].def->identifier);
+		}
+		return str_c(result);
+	}
+	return NULL;
+}
+
+/*
+ * Compile-time argument validation
+ */
+
+static const char *ext_enotify_uri_scheme_parse(const char **uri_p)
+{
+	string_t *scheme = t_str_new(EXT_ENOTIFY_MAX_SCHEME_LEN);
+	const char *p = *uri_p;
+	unsigned int len = 0;
+
+	/* RFC 3968:
+	  
+	     scheme  = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." )
+	  
+	   FIXME: we do not allow '%' in schemes. Is this correct?
+	 */
+
+	if (!i_isalpha(*p))
+		return NULL;
+
+	str_append_c(scheme, *p);
+	p++;
+
+	while (*p != '\0' && len < EXT_ENOTIFY_MAX_SCHEME_LEN) {
+		if (!i_isalnum(*p) && *p != '+' && *p != '-' && *p != '.')
+			break;
+
+		str_append_c(scheme, *p);
+		p++;
+		len++;
+	}
+
+	if (*p != ':')
+		return NULL;
+	p++;
+
+	*uri_p = p;
+	return str_c(scheme);
+}
+
+static bool
+ext_enotify_option_parse(struct sieve_enotify_env *nenv,
+			 const char *option, bool name_only,
+			 const char **opt_name_r, const char **opt_value_r)
+{
+	const char *p = option;
+
+	/* "<optionname>=<value>".
+	
+	   l-d = ALPHA / DIGIT
+	   l-d-p = l-d / "." / "-" / "_"
+	   optionname = l-d *l-d-p
+	   value = *(%x01-09 / %x0B-0C / %x0E-FF)
+	 */
+
+	/*
+	 * Parse option name
+	 */
+
+	/* optionname = l-d *l-d-p
+	 */
+
+	/* Explicitly report empty option as such */
+	if (*p == '\0') {
+		sieve_enotify_error(nenv, "empty option specified");
+		return FALSE;
+	}
+
+	/* l-d = ALPHA / DIGIT */
+	if (i_isalnum(*p)) {
+		p++;
+
+		/* l-d-p = l-d / "." / "-" / "_" */
+		while (i_isalnum(*p) || *p == '.' || *p == '-' || *p == '_')
+			p++;
+	}
+
+	/* Parsing must end at '=' and we must parse at least one character */
+	if (*p != '=' || p == option) {
+		sieve_enotify_error(
+			nenv, "invalid option name specified in option '%s'",
+			str_sanitize(option, 80));
+		return FALSE;
+	}
+
+	/* Assign option name */
+	if (opt_name_r != NULL)
+		*opt_name_r = t_strdup_until(option, p);
+
+	/* Skip '=' */
+	p++;
+
+	/* Exit now if only the option name is of interest */
+	if (name_only)
+		return TRUE;
+
+	/*
+	 * Parse option value
+	 */
+
+	/* value = *(%x01-09 / %x0B-0C / %x0E-FF) */
+	while (*p != '\0' && *p != 0x0A && *p != 0x0D)
+		p++;
+
+	/* Parse must end at end of string */
+	if (*p != '\0') {
+		sieve_enotify_error(
+			nenv, "notify command: "
+			"invalid option value specified in option '%s'",
+			str_sanitize(option, 80));
+		return FALSE;
+	}
+
+	/* Assign option value */
+	if (opt_value_r != NULL)
+		*opt_value_r = p;
+
+	return TRUE;
+}
+
+struct _ext_enotify_option_check_context {
+	struct sieve_instance *svinst;
+	struct sieve_validator *valdtr;
+	const struct sieve_enotify_method *method;
+};
+
+static int
+_ext_enotify_option_check(void *context, struct sieve_ast_argument *arg)
+{
+	struct _ext_enotify_option_check_context *optn_context =
+		(struct _ext_enotify_option_check_context *) context;
+	struct sieve_validator *valdtr = optn_context->valdtr;
+	const struct sieve_enotify_method *method = optn_context->method;
+	struct sieve_enotify_env nenv;
+	const char *option = sieve_ast_argument_strc(arg);
+	const char *opt_name = NULL, *opt_value = NULL;
+	bool check = TRUE;
+	int result = 1;
+
+	/* Compose log structure */
+	i_zero(&nenv);
+	nenv.svinst = optn_context->svinst;
+	nenv.method = method;
+	nenv.ehandler = sieve_validator_error_handler(valdtr);
+	nenv.location = sieve_error_script_location(
+		sieve_validator_script(valdtr), arg->source_line);
+	nenv.event = event_create(nenv.svinst->event);
+	event_set_append_log_prefix(nenv.event, "notify command: ");
+
+	/* Parse option */
+	if (!sieve_argument_is_string_literal(arg)) {
+		/* Variable string: partial option parse
+
+		   If the string item is not a string literal, it cannot be
+		   validated fully at compile time. We can however check whether
+		   the '=' is in the string specification and whether the part
+		   before the '=' is a valid option name. In that case, the
+		   method option check function is called with the value
+		   parameter equal to NULL, meaning that it should only check
+		   the validity of the option itself and not the assigned value.
+		 */
+		if (!ext_enotify_option_parse(NULL, option, TRUE,
+					      &opt_name, &opt_value))
+			check = FALSE;
+	} else {
+		/* Literal string: full option parse */
+		if (!ext_enotify_option_parse(&nenv, option, FALSE,
+					      &opt_name, &opt_value))
+			result = -1;
+	}
+
+	/* Call method's option check function */
+	if (result > 0 && check && method->def != NULL &&
+	    method->def->compile_check_option != NULL) {
+		result = (method->def->compile_check_option(&nenv, opt_name,
+							    opt_value) ?
+			  1 : -1 );
+	}
+
+	event_unref(&nenv.event);
+	return result;
+}
+
+bool ext_enotify_compile_check_arguments(struct sieve_validator *valdtr,
+					 struct sieve_command *cmd,
+					 struct sieve_ast_argument *uri_arg,
+					 struct sieve_ast_argument *msg_arg,
+					 struct sieve_ast_argument *from_arg,
+					 struct sieve_ast_argument *options_arg)
+{
+	const struct sieve_extension *this_ext = cmd->ext;
+	struct sieve_instance *svinst = this_ext->svinst;
+	const char *uri = sieve_ast_argument_strc(uri_arg);
+	const char *scheme;
+	const struct sieve_enotify_method *method;
+	struct sieve_enotify_env nenv;
+	bool result = TRUE;
+
+	/* If the uri string is not a constant literal, we cannot determine
+	   which method is used, so we bail out successfully and defer checking
+	   to runtime.
+	 */
+	if (!sieve_argument_is_string_literal(uri_arg))
+		return TRUE;
+
+	/* Parse scheme part of URI */
+	if ((scheme = ext_enotify_uri_scheme_parse(&uri)) == NULL) {
+		sieve_argument_validate_error(
+			valdtr, uri_arg, "notify command: "
+			"invalid scheme part for method URI '%s'",
+			str_sanitize(sieve_ast_argument_strc(uri_arg), 80));
+		return FALSE;
+	}
+
+	/* Find used method with the parsed scheme identifier */
+	if ((method = ext_enotify_method_find(this_ext, scheme)) == NULL) {
+		sieve_argument_validate_error(
+			valdtr, uri_arg, "notify command: "
+			"invalid method '%s'", scheme);
+		return FALSE;
+	}
+
+	if (method->def == NULL)
+		return TRUE;
+
+	/* Compose log structure */
+	i_zero(&nenv);
+	nenv.svinst = svinst;
+	nenv.method = method;
+
+	/* Check URI itself */
+	if (result && method->def->compile_check_uri != NULL) {
+		/* Set log location to location of URI argument */
+		nenv.ehandler = sieve_validator_error_handler(valdtr);
+		nenv.location = sieve_error_script_location(
+			sieve_validator_script(valdtr), uri_arg->source_line);
+		nenv.event = event_create(nenv.svinst->event);
+		event_set_append_log_prefix(nenv.event, "notify command: ");
+
+		/* Execute method check function */
+		result = method->def->compile_check_uri(
+			&nenv, sieve_ast_argument_strc(uri_arg), uri);
+	}
+
+	/* Check :message argument */
+	if (result && msg_arg != NULL &&
+	    sieve_argument_is_string_literal(msg_arg) &&
+	    method->def->compile_check_message != NULL ) {
+		/* Set log location to location of :message argument */
+		event_unref(&nenv.event);
+		nenv.ehandler = sieve_validator_error_handler(valdtr);
+		nenv.location = sieve_error_script_location(
+			sieve_validator_script(valdtr), msg_arg->source_line);
+		nenv.event = event_create(nenv.svinst->event);
+		event_set_append_log_prefix(nenv.event, "notify command: ");
+
+		/* Execute method check function */
+		result = method->def->compile_check_message(
+			&nenv, sieve_ast_argument_str(msg_arg));
+	}
+
+	/* Check :from argument */
+	if (result && from_arg != NULL &&
+	    sieve_argument_is_string_literal(from_arg) &&
+	    method->def->compile_check_from != NULL ) {
+		/* Set log location to location of :from argument */
+		event_unref(&nenv.event);
+		nenv.ehandler = sieve_validator_error_handler(valdtr);
+		nenv.location = sieve_error_script_location(
+			sieve_validator_script(valdtr), from_arg->source_line);
+		nenv.event = event_create(nenv.svinst->event);
+		event_set_append_log_prefix(nenv.event, "notify command: ");
+
+		/* Execute method check function */
+		result = method->def->compile_check_from(
+			&nenv, sieve_ast_argument_str(from_arg));
+	}
+
+	event_unref(&nenv.event);
+
+	/* Check :options argument */
+	if (result && options_arg != NULL) {
+		struct sieve_ast_argument *option = options_arg;
+		struct _ext_enotify_option_check_context optn_context = {
+			svinst, valdtr, method };
+
+		/* Parse and check options */
+		result = (sieve_ast_stringlist_map(
+			&option, (void *) &optn_context,
+			_ext_enotify_option_check) > 0);
+
+		/* Discard argument if options are not accepted by method */
+		if (result && method->def->compile_check_option == NULL) {
+			sieve_argument_validate_warning(
+				valdtr, options_arg, "notify command: "
+				"method '%s' accepts no options", scheme);
+			(void)sieve_ast_arguments_detach(options_arg, 1);
+		}
+	}
+	return result;
+}
+
+/*
+ * Runtime operand checking
+ */
+
+bool ext_enotify_runtime_method_validate(const struct sieve_runtime_env *renv,
+					 string_t *method_uri)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	const struct sieve_extension *this_ext = renv->oprtn->ext;
+	const struct sieve_enotify_method *method;
+	const char *uri = str_c(method_uri);
+	const char *scheme;
+	bool result = TRUE;
+
+	/* Get the method */
+
+	if ((scheme = ext_enotify_uri_scheme_parse(&uri)) == NULL)
+		return FALSE;
+	if ((method = ext_enotify_method_find(this_ext, scheme)) == NULL)
+		return FALSE;
+
+	/* Validate the provided URI */
+
+	if (method->def != NULL && method->def->runtime_check_uri != NULL) {
+		struct sieve_enotify_env nenv;
+
+		i_zero(&nenv);
+		nenv.svinst = eenv->svinst;
+		nenv.method = method;
+		nenv.ehandler = renv->ehandler;
+		nenv.location = sieve_runtime_get_full_command_location(renv),
+		nenv.event = event_create(nenv.svinst->event);
+		event_set_append_log_prefix(nenv.event,
+					    "valid_notify_method test: ");
+
+		/* Use the method check function to validate the URI */
+		result = method->def->runtime_check_uri(
+			&nenv, str_c(method_uri), uri);
+
+		event_unref(&nenv.event);
+	}
+
+	return result;
+}
+
+static const struct
+sieve_enotify_method *ext_enotify_get_method(
+	const struct sieve_runtime_env *renv, string_t *method_uri,
+	const char **uri_body_r)
+{
+	const struct sieve_extension *this_ext = renv->oprtn->ext;
+	const struct sieve_enotify_method *method;
+	const char *uri = str_c(method_uri);
+	const char *scheme;
+
+	/* Parse part before ':' of the uri (the scheme) and use it to identify
+	   notify method.
+	 */
+	if ((scheme = ext_enotify_uri_scheme_parse(&uri)) == NULL) {
+		sieve_runtime_error(
+			renv, NULL, "invalid scheme part for method URI '%s'",
+			str_sanitize(str_c(method_uri), 80));
+		return NULL;
+	}
+
+	/* Find the notify method */
+	if ((method = ext_enotify_method_find(this_ext, scheme)) == NULL) {
+		sieve_runtime_error(renv, NULL,	"invalid notify method '%s'",
+				    scheme);
+		return NULL;
+	}
+
+	/* Return the parse pointer and the found method */
+	*uri_body_r = uri;
+	return method;
+}
+
+const char *
+ext_enotify_runtime_get_method_capability(const struct sieve_runtime_env *renv,
+					  string_t *method_uri,
+					  const char *capability)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	const struct sieve_enotify_method *method;
+	const char *uri_body;
+	const char *result = NULL;
+
+	/* Get method */
+	method = ext_enotify_get_method(renv, method_uri, &uri_body);
+	if ( method == NULL ) return NULL;
+
+	/* Get requested capability */
+	if (method->def != NULL &&
+	    method->def->runtime_get_method_capability != NULL) {
+		struct sieve_enotify_env nenv;
+
+		i_zero(&nenv);
+		nenv.svinst = eenv->svinst;
+		nenv.method = method;
+		nenv.ehandler = renv->ehandler;
+		nenv.location = sieve_runtime_get_full_command_location(renv),
+		nenv.event = event_create(nenv.svinst->event);
+		event_set_append_log_prefix(nenv.event,
+					    "notify_method_capability test: ");
+
+		/* Execute method function to acquire capability value */
+		result = method->def->runtime_get_method_capability(
+			&nenv, str_c(method_uri), uri_body, capability);
+
+		event_unref(&nenv.event);
+	}
+
+	return result;
+}
+
+int ext_enotify_runtime_check_operands(
+	const struct sieve_runtime_env *renv, string_t *method_uri,
+	string_t *message, string_t *from, struct sieve_stringlist *options,
+	const struct sieve_enotify_method **method_r, void **method_context)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	const struct sieve_enotify_method *method;
+	const char *uri_body;
+
+	/* Get method */
+	method = ext_enotify_get_method(renv, method_uri, &uri_body);
+	if (method == NULL)
+		return SIEVE_EXEC_FAILURE;
+
+	/* Check provided operands */
+	if (method->def != NULL &&
+	    method->def->runtime_check_operands != NULL) {
+		struct sieve_enotify_env nenv;
+		int result = SIEVE_EXEC_OK;
+
+		i_zero(&nenv);
+		nenv.svinst = eenv->svinst;
+		nenv.method = method;
+		nenv.ehandler = renv->ehandler;
+		nenv.location = sieve_runtime_get_full_command_location(renv),
+		nenv.event = event_create(nenv.svinst->event);
+		event_set_append_log_prefix(nenv.event, "notify_action: ");
+
+		/* Execute check function */
+		if (method->def->runtime_check_operands(
+			&nenv, str_c(method_uri), uri_body, message, from,
+			sieve_result_pool(renv->result), method_context)) {
+
+			/* Check any provided options */
+			if (options != NULL) {
+				string_t *option = NULL;
+				int ret;
+
+				/* Iterate through all provided options */
+				while ((ret = sieve_stringlist_next_item(
+					options, &option)) > 0) {
+					const char *opt_name = NULL;
+					const char *opt_value = NULL;
+
+					/* Parse option into <optionname> and
+					   <value> */
+					if (ext_enotify_option_parse(
+						&nenv, str_c(option), FALSE,
+						&opt_name, &opt_value)) {
+
+						/* Set option */
+						if (method->def->runtime_set_option != NULL) {
+							(void)method->def->runtime_set_option(
+								&nenv, *method_context,
+								opt_name, opt_value);
+						}
+					}
+				}
+
+				/* Check for binary corruptions encountered
+				   during string list iteration */
+				if (ret >= 0) {
+					*method_r = method;
+				} else {
+					/* Binary corrupt */
+					sieve_runtime_trace_error(
+						renv, "invalid item in options string list");
+					result = SIEVE_EXEC_BIN_CORRUPT;
+				}
+
+			} else {
+				/* No options */
+				*method_r = method;
+			}
+
+		} else {
+			/* Operand check failed */
+			result = SIEVE_EXEC_FAILURE;
+		}
+
+		event_unref(&nenv.event);
+		return result;
+	}
+
+	/* No check function defined: a most unlikely situation */
+	*method_context = NULL;
+	*method_r = method;
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Notify method printing
+ */
+
+void sieve_enotify_method_printf(const struct sieve_enotify_print_env *penv,
+				 const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	sieve_result_vprintf(penv->result_penv, fmt, args);
+	va_end(args);
+}
+
+/*
+ * Action execution
+ */
+
+struct event_passthrough *
+sieve_enotify_create_finish_event(const struct sieve_enotify_exec_env *nenv)
+{
+	struct event_passthrough *e =
+		event_create_passthrough(nenv->event)->
+		set_name("sieve_action_finished");
+
+	return e;
+}
+
diff --git a/pigeonhole/src/lib-sieve/plugins/enotify/ext-enotify-common.h b/pigeonhole/src/lib-sieve/plugins/enotify/ext-enotify-common.h
new file mode 100644
index 0000000..ec43202
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/enotify/ext-enotify-common.h
@@ -0,0 +1,122 @@
+#ifndef EXT_ENOTIFY_COMMON_H
+#define EXT_ENOTIFY_COMMON_H
+
+#include "lib.h"
+#include "array.h"
+
+#include "sieve-common.h"
+
+#include "sieve-ext-variables.h"
+
+#include "sieve-ext-enotify.h"
+
+/*
+ * Extension
+ */
+
+extern const struct sieve_extension_def enotify_extension;
+extern const struct sieve_extension_capabilities notify_capabilities;
+
+struct ext_enotify_context {
+	const struct sieve_extension *var_ext;
+	ARRAY(struct sieve_enotify_method) notify_methods;
+};
+
+
+/*
+ * Commands
+ */
+
+extern const struct sieve_command_def notify_command;
+
+/* Codes for optional arguments */
+
+enum cmd_notify_optional {
+    CMD_NOTIFY_OPT_END,
+    CMD_NOTIFY_OPT_FROM,
+    CMD_NOTIFY_OPT_OPTIONS,
+    CMD_NOTIFY_OPT_MESSAGE,
+    CMD_NOTIFY_OPT_IMPORTANCE
+};
+
+/*
+ * Tests
+ */
+
+extern const struct sieve_command_def valid_notify_method_test;
+extern const struct sieve_command_def notify_method_capability_test;
+
+/*
+ * Operations
+ */
+
+extern const struct sieve_operation_def notify_operation;
+extern const struct sieve_operation_def valid_notify_method_operation;
+extern const struct sieve_operation_def notify_method_capability_operation;
+
+enum ext_variables_opcode {
+	EXT_ENOTIFY_OPERATION_NOTIFY,
+	EXT_ENOTIFY_OPERATION_VALID_NOTIFY_METHOD,
+	EXT_ENOTIFY_OPERATION_NOTIFY_METHOD_CAPABILITY
+};
+
+/*
+ * Operands
+ */
+
+extern const struct sieve_operand_def encodeurl_operand;
+
+/*
+ * Modifiers
+ */
+
+extern const struct sieve_variables_modifier_def encodeurl_modifier;
+
+/*
+ * Notify methods
+ */
+
+void ext_enotify_methods_init(struct sieve_instance *svinst,
+			      struct ext_enotify_context *ectx);
+void ext_enotify_methods_deinit(struct ext_enotify_context *ectx);
+
+const struct sieve_enotify_method *
+ext_enotify_method_find(const struct sieve_extension *ntfy_ext,
+			const char *identifier);
+
+/*
+ * Validation
+ */
+
+bool ext_enotify_compile_check_arguments(
+	struct sieve_validator *valdtr, struct sieve_command *cmd,
+	struct sieve_ast_argument *uri_arg, struct sieve_ast_argument *msg_arg,
+	struct sieve_ast_argument *from_arg,
+	struct sieve_ast_argument *options_arg);
+
+/*
+ * Runtime
+ */
+
+bool ext_enotify_runtime_method_validate(const struct sieve_runtime_env *renv,
+					 string_t *method_uri);
+
+const char *
+ext_enotify_runtime_get_method_capability(const struct sieve_runtime_env *renv,
+					  string_t *method_uri,
+					  const char *capability);
+
+int ext_enotify_runtime_check_operands(
+	const struct sieve_runtime_env *renv, string_t *method_uri,
+	string_t *message, string_t *from, struct sieve_stringlist *options,
+	const struct sieve_enotify_method **method_r, void **method_context);
+
+/*
+ * Method printing
+ */
+
+struct sieve_enotify_print_env {
+	const struct sieve_result_print_env *result_penv;
+};
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/enotify/ext-enotify-limits.h b/pigeonhole/src/lib-sieve/plugins/enotify/ext-enotify-limits.h
new file mode 100644
index 0000000..aac48df
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/enotify/ext-enotify-limits.h
@@ -0,0 +1,6 @@
+#ifndef EXT_ENOTIFY_LIMITS_H
+#define EXT_ENOTIFY_LIMITS_H
+
+#define EXT_ENOTIFY_MAX_SCHEME_LEN  32
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/enotify/ext-enotify.c b/pigeonhole/src/lib-sieve/plugins/enotify/ext-enotify.c
new file mode 100644
index 0000000..df479b3
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/enotify/ext-enotify.c
@@ -0,0 +1,103 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension enotify
+ * ------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 5435
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "sieve-common.h"
+
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-actions.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-result.h"
+
+#include "sieve-ext-variables.h"
+
+#include "ext-enotify-common.h"
+
+/*
+ * Operations
+ */
+
+const struct sieve_operation_def *ext_enotify_operations[] = {
+	&notify_operation,
+	&valid_notify_method_operation,
+	&notify_method_capability_operation
+};
+
+/*
+ * Extension
+ */
+
+static bool ext_enotify_load(const struct sieve_extension *ext, void **context);
+static void ext_enotify_unload(const struct sieve_extension *ext);
+static bool ext_enotify_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+
+const struct sieve_extension_def enotify_extension = {
+	.name = "enotify",
+	.load = ext_enotify_load,
+	.unload = ext_enotify_unload,
+	.validator_load = ext_enotify_validator_load,
+	SIEVE_EXT_DEFINE_OPERATIONS(ext_enotify_operations),
+	SIEVE_EXT_DEFINE_OPERAND(encodeurl_operand)
+};
+
+static bool ext_enotify_load(const struct sieve_extension *ext, void **context)
+{
+	struct ext_enotify_context *ectx;
+
+	if ( *context != NULL ) {
+		ext_enotify_unload(ext);
+	}
+
+	ectx = i_new(struct ext_enotify_context, 1);
+	ectx->var_ext = sieve_ext_variables_get_extension(ext->svinst);
+	*context = (void *) ectx;
+
+	ext_enotify_methods_init(ext->svinst, ectx);
+
+	sieve_extension_capabilities_register(ext, &notify_capabilities);
+
+	return TRUE;
+}
+
+static void ext_enotify_unload(const struct sieve_extension *ext)
+{
+	struct ext_enotify_context *ectx =
+		(struct ext_enotify_context *) ext->context;
+
+	ext_enotify_methods_deinit(ectx);
+
+	i_free(ectx);
+}
+
+static bool ext_enotify_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	struct ext_enotify_context *ectx =
+		(struct ext_enotify_context *) ext->context;
+
+	/* Register new commands */
+	sieve_validator_register_command(valdtr, ext, &notify_command);
+	sieve_validator_register_command(valdtr, ext, &valid_notify_method_test);
+	sieve_validator_register_command(valdtr, ext, &notify_method_capability_test);
+
+	/* Register new set modifier for variables extension */
+	sieve_variables_modifier_register
+		(ectx->var_ext, valdtr, ext, &encodeurl_modifier);
+
+	return TRUE;
+}
+
diff --git a/pigeonhole/src/lib-sieve/plugins/enotify/mailto/Makefile.am b/pigeonhole/src/lib-sieve/plugins/enotify/mailto/Makefile.am
new file mode 100644
index 0000000..83f129c
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/enotify/mailto/Makefile.am
@@ -0,0 +1,16 @@
+noinst_LTLIBRARIES = libsieve_ext_enotify_mailto.la
+
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+	-I$(srcdir)/.. \
+	-I$(srcdir)/../../.. \
+	-I$(srcdir)/../../../util \
+	$(LIBDOVECOT_INCLUDE)
+
+libsieve_ext_enotify_mailto_la_SOURCES = \
+	uri-mailto.c \
+	ntfy-mailto.c
+
+noinst_HEADERS = \
+	uri-mailto.h
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/enotify/mailto/Makefile.in b/pigeonhole/src/lib-sieve/plugins/enotify/mailto/Makefile.in
new file mode 100644
index 0000000..49aa41a
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/enotify/mailto/Makefile.in
@@ -0,0 +1,687 @@
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+	ntfy-mailto.c
+
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+	$(AM_V_CCLD)$(LINK)  $(libsieve_ext_enotify_mailto_la_OBJECTS) $(libsieve_ext_enotify_mailto_la_LIBADD) $(LIBS)
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+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
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+	done >> $(top_builddir)/cscope.files
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+	fi
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+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/enotify/mailto/ntfy-mailto.c b/pigeonhole/src/lib-sieve/plugins/enotify/mailto/ntfy-mailto.c
new file mode 100644
index 0000000..4e104d1
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/enotify/mailto/ntfy-mailto.c
@@ -0,0 +1,794 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Notify method mailto
+ * --------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 5436
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+/* FIXME: URI syntax conforms to something somewhere in between RFC 2368 and
+ *   draft-duerst-mailto-bis-05.txt. Should fully migrate to new specification
+ *   when it matures. This requires modifications to the address parser (no
+ *   whitespace allowed within the address itself) and UTF-8 support will be
+ *   required in the URL.
+ */
+
+#include "lib.h"
+#include "array.h"
+#include "str.h"
+#include "ioloop.h"
+#include "str-sanitize.h"
+#include "ostream.h"
+#include "message-date.h"
+#include "mail-storage.h"
+
+#include "sieve-common.h"
+#include "sieve-address.h"
+#include "sieve-address-source.h"
+#include "sieve-message.h"
+#include "sieve-smtp.h"
+#include "sieve-settings.h"
+
+#include "sieve-ext-enotify.h"
+
+#include "rfc2822.h"
+
+#include "uri-mailto.h"
+
+/*
+ * Configuration
+ */
+
+#define NTFY_MAILTO_MAX_RECIPIENTS  8
+#define NTFY_MAILTO_MAX_HEADERS     16
+#define NTFY_MAILTO_MAX_SUBJECT     256
+
+/*
+ * Mailto notification configuration
+ */
+
+struct ntfy_mailto_config {
+	pool_t pool;
+	struct sieve_address_source envelope_from;
+};
+
+/*
+ * Mailto notification method
+ */
+
+static bool ntfy_mailto_load
+	(const struct sieve_enotify_method *nmth, void **context);
+static void ntfy_mailto_unload
+	(const struct sieve_enotify_method *nmth);
+
+static bool ntfy_mailto_compile_check_uri
+	(const struct sieve_enotify_env *nenv, const char *uri, const char *uri_body);
+static bool ntfy_mailto_compile_check_from
+	(const struct sieve_enotify_env *nenv, string_t *from);
+
+static const char *ntfy_mailto_runtime_get_notify_capability
+	(const struct sieve_enotify_env *nenv, const char *uri, const char *uri_body,
+		const char *capability);
+static bool ntfy_mailto_runtime_check_uri
+	(const struct sieve_enotify_env *nenv, const char *uri, const char *uri_body);
+static bool ntfy_mailto_runtime_check_operands
+	(const struct sieve_enotify_env *nenv, const char *uri,const char *uri_body,
+		string_t *message, string_t *from, pool_t context_pool,
+		void **method_context);
+
+static int ntfy_mailto_action_check_duplicates
+	(const struct sieve_enotify_env *nenv,
+		const struct sieve_enotify_action *nact,
+		const struct sieve_enotify_action *nact_other);
+
+static void ntfy_mailto_action_print
+	(const struct sieve_enotify_print_env *penv,
+		const struct sieve_enotify_action *nact);
+
+static int ntfy_mailto_action_execute
+	(const struct sieve_enotify_exec_env *nenv,
+		const struct sieve_enotify_action *nact);
+
+const struct sieve_enotify_method_def mailto_notify = {
+	"mailto",
+	ntfy_mailto_load,
+	ntfy_mailto_unload,
+	ntfy_mailto_compile_check_uri,
+	NULL,
+	ntfy_mailto_compile_check_from,
+	NULL,
+	ntfy_mailto_runtime_check_uri,
+	ntfy_mailto_runtime_get_notify_capability,
+	ntfy_mailto_runtime_check_operands,
+	NULL,
+	ntfy_mailto_action_check_duplicates,
+	ntfy_mailto_action_print,
+	ntfy_mailto_action_execute
+};
+
+/*
+ * Reserved and unique headers
+ */
+
+static const char *_reserved_headers[] = {
+	"auto-submitted",
+	"received",
+	"message-id",
+	"data",
+	"bcc",
+	"in-reply-to",
+	"references",
+	"resent-date",
+	"resent-from",
+	"resent-sender",
+	"resent-to",
+	"resent-cc",
+ 	"resent-bcc",
+	"resent-msg-id",
+	"from",
+	"sender",
+	NULL
+};
+
+static const char *_unique_headers[] = {
+	"reply-to",
+	NULL
+};
+
+/*
+ * Method context data
+ */
+
+struct ntfy_mailto_context {
+	struct uri_mailto *uri;
+	const struct smtp_address *from_address;
+};
+
+/*
+ * Method registration
+ */
+
+static bool ntfy_mailto_load
+(const struct sieve_enotify_method *nmth, void **context)
+{
+	struct sieve_instance *svinst = nmth->svinst;
+	struct ntfy_mailto_config *config;
+	pool_t pool;
+
+	if ( *context != NULL ) {
+		ntfy_mailto_unload(nmth);
+	}
+
+	pool = pool_alloconly_create("ntfy_mailto_config", 256);
+	config = p_new(pool, struct ntfy_mailto_config, 1);
+	config->pool = pool;
+
+	(void)sieve_address_source_parse_from_setting	(svinst,
+		config->pool, "sieve_notify_mailto_envelope_from",
+		&config->envelope_from);
+
+	*context = (void *) config;
+
+	return TRUE;
+}
+
+static void ntfy_mailto_unload
+(const struct sieve_enotify_method *nmth)
+{
+	struct ntfy_mailto_config *config =
+		(struct ntfy_mailto_config *) nmth->context;
+
+	pool_unref(&config->pool);
+}
+
+/*
+ * URI parsing
+ */
+
+struct ntfy_mailto_uri_env {
+	const struct sieve_enotify_env *nenv;
+
+	struct event *event;
+
+	struct uri_mailto_log uri_log;
+};
+
+static void ATTR_FORMAT(5, 0)
+ntfy_mailto_uri_logv(void *context, enum log_type log_type,
+		     const char *csrc_filename, unsigned int csrc_linenum,
+		     const char *fmt, va_list args)
+{
+	struct ntfy_mailto_uri_env *nmuenv = context;
+	const struct sieve_enotify_env *nenv = nmuenv->nenv;
+
+	sieve_event_logv(nenv->svinst, nenv->ehandler, nmuenv->event,
+			 log_type, csrc_filename, csrc_linenum,
+			 nenv->location, 0, fmt, args);
+}
+
+static void
+ntfy_mailto_uri_env_init(struct ntfy_mailto_uri_env *nmuenv,
+			 const struct sieve_enotify_env *nenv)
+{
+	i_zero(nmuenv);
+	nmuenv->nenv = nenv;
+	nmuenv->event = event_create(nenv->event);
+	event_set_append_log_prefix(nmuenv->event, "mailto URI: ");
+
+	nmuenv->uri_log.context = nmuenv;
+	nmuenv->uri_log.logv = ntfy_mailto_uri_logv;
+}
+
+static void
+ntfy_mailto_uri_env_deinit(struct ntfy_mailto_uri_env *nmuenv)
+{
+	event_unref(&nmuenv->event);
+}
+
+/*
+ * Validation
+ */
+
+
+static bool ntfy_mailto_compile_check_uri
+(const struct sieve_enotify_env *nenv, const char *uri ATTR_UNUSED,
+	const char *uri_body)
+{
+	struct ntfy_mailto_uri_env nmuenv;
+	bool result;
+
+	ntfy_mailto_uri_env_init(&nmuenv, nenv);
+	result = uri_mailto_validate(
+		uri_body, _reserved_headers, _unique_headers,
+		NTFY_MAILTO_MAX_RECIPIENTS, NTFY_MAILTO_MAX_HEADERS,
+		&nmuenv.uri_log);
+	ntfy_mailto_uri_env_deinit(&nmuenv);
+
+	return result;
+}
+
+static bool ntfy_mailto_compile_check_from
+(const struct sieve_enotify_env *nenv, string_t *from)
+{
+	const char *error;
+	bool result = FALSE;
+
+	T_BEGIN {
+		result = sieve_address_validate_str(from, &error);
+		if ( !result ) {
+			sieve_enotify_error(nenv,
+				"specified :from address '%s' is invalid for "
+				"the mailto method: %s",
+				str_sanitize(str_c(from), 128), error);
+		}
+	} T_END;
+
+	return result;
+}
+
+/*
+ * Runtime
+ */
+
+struct ntfy_mailto_runtime_env {
+	const struct sieve_enotify_env *nenv;
+
+	struct event *event;
+};
+
+static const char *ntfy_mailto_runtime_get_notify_capability
+(const struct sieve_enotify_env *nenv ATTR_UNUSED, const char *uri ATTR_UNUSED,
+	const char *uri_body, const char *capability)
+{
+	if ( !uri_mailto_validate(uri_body, _reserved_headers, _unique_headers,
+			NTFY_MAILTO_MAX_RECIPIENTS, NTFY_MAILTO_MAX_HEADERS, NULL) ) {
+		return NULL;
+	}
+
+	if ( strcasecmp(capability, "online") == 0 )
+		return "maybe";
+
+	return NULL;
+}
+
+static bool ntfy_mailto_runtime_check_uri
+(const struct sieve_enotify_env *nenv ATTR_UNUSED, const char *uri ATTR_UNUSED,
+	const char *uri_body)
+{
+	return uri_mailto_validate
+		(uri_body, _reserved_headers, _unique_headers,
+			NTFY_MAILTO_MAX_RECIPIENTS, NTFY_MAILTO_MAX_HEADERS, NULL);
+}
+
+static bool ntfy_mailto_runtime_check_operands
+(const struct sieve_enotify_env *nenv, const char *uri ATTR_UNUSED,
+	const char *uri_body, string_t *message ATTR_UNUSED, string_t *from,
+	pool_t context_pool, void **method_context)
+{
+	struct ntfy_mailto_context *mtctx;
+	struct uri_mailto *parsed_uri;
+	const struct smtp_address *address;
+	struct ntfy_mailto_uri_env nmuenv;
+	const char *error;
+
+	/* Need to create context before validation to have arrays present */
+	mtctx = p_new(context_pool, struct ntfy_mailto_context, 1);
+
+	/* Validate :from */
+	if ( from != NULL ) {
+		T_BEGIN {
+			address = sieve_address_parse_str(from, &error);
+			if ( address == NULL ) {
+				sieve_enotify_error(nenv,
+					"specified :from address '%s' is invalid for "
+					"the mailto method: %s",
+					str_sanitize(str_c(from), 128), error);
+			} else
+				mtctx->from_address =
+					smtp_address_clone(context_pool, address);
+		} T_END;
+
+		if ( address == NULL ) return FALSE;
+	}
+
+	ntfy_mailto_uri_env_init(&nmuenv, nenv);
+	parsed_uri = uri_mailto_parse(uri_body, context_pool,
+				      _reserved_headers, _unique_headers,
+				      NTFY_MAILTO_MAX_RECIPIENTS,
+				      NTFY_MAILTO_MAX_HEADERS,
+				      &nmuenv.uri_log);
+	ntfy_mailto_uri_env_deinit(&nmuenv);
+
+	if (parsed_uri == NULL)
+		return FALSE;
+
+	mtctx->uri = parsed_uri;
+	*method_context = (void *) mtctx;
+	return TRUE;
+}
+
+/*
+ * Action duplicates
+ */
+
+static int ntfy_mailto_action_check_duplicates
+(const struct sieve_enotify_env *nenv ATTR_UNUSED,
+	const struct sieve_enotify_action *nact,
+	const struct sieve_enotify_action *nact_other)
+{
+	struct ntfy_mailto_context *mtctx =
+		(struct ntfy_mailto_context *) nact->method_context;
+	struct ntfy_mailto_context *mtctx_other =
+		(struct ntfy_mailto_context *) nact_other->method_context;
+	const struct uri_mailto_recipient *new_rcpts, *old_rcpts;
+	unsigned int new_count, old_count, i, j;
+	unsigned int del_start = 0, del_len = 0;
+
+	new_rcpts = array_get(&mtctx->uri->recipients, &new_count);
+	old_rcpts = array_get(&mtctx_other->uri->recipients, &old_count);
+
+	for ( i = 0; i < new_count; i++ ) {
+		for ( j = 0; j < old_count; j++ ) {
+			if ( smtp_address_equals
+				(new_rcpts[i].address, old_rcpts[j].address) )
+				break;
+		}
+
+		if ( j == old_count ) {
+			/* Not duplicate */
+			if ( del_len > 0 ) {
+				/* Perform pending deletion */
+				array_delete(&mtctx->uri->recipients, del_start, del_len);
+
+				/* Make sure the loop integrity is maintained */
+				i -= del_len;
+				new_rcpts = array_get(&mtctx->uri->recipients, &new_count);
+			}
+			del_len = 0;
+		} else {
+			/* Mark deletion */
+			if ( del_len == 0 )
+				del_start = i;
+			del_len++;
+		}
+	}
+
+	/* Perform pending deletion */
+	if ( del_len > 0 ) {
+		array_delete(&mtctx->uri->recipients, del_start, del_len);
+	}
+
+	return ( array_count(&mtctx->uri->recipients) > 0 ? 0 : 1 );
+}
+
+/*
+ * Action printing
+ */
+
+static void ntfy_mailto_action_print
+(const struct sieve_enotify_print_env *penv,
+	const struct sieve_enotify_action *nact)
+{
+	unsigned int count, i;
+	const struct uri_mailto_recipient *recipients;
+	const struct uri_mailto_header_field *headers;
+	struct ntfy_mailto_context *mtctx =
+		(struct ntfy_mailto_context *) nact->method_context;
+
+	/* Print main method parameters */
+
+	sieve_enotify_method_printf
+		(penv,   "    => importance   : %llu\n",
+			(unsigned long long)nact->importance);
+
+	if ( nact->message != NULL )
+		sieve_enotify_method_printf
+			(penv, "    => subject      : %s\n", nact->message);
+	else if ( mtctx->uri->subject != NULL )
+		sieve_enotify_method_printf
+			(penv, "    => subject      : %s\n", mtctx->uri->subject);
+
+	if ( nact->from != NULL )
+		sieve_enotify_method_printf
+			(penv, "    => from         : %s\n", nact->from);
+
+	/* Print mailto: recipients */
+
+	sieve_enotify_method_printf(penv,   "    => recipients   :\n" );
+
+	recipients = array_get(&mtctx->uri->recipients, &count);
+	if ( count == 0 ) {
+		sieve_enotify_method_printf(penv,   "       NONE, action has no effect\n");
+	} else {
+		for ( i = 0; i < count; i++ ) {
+			if ( recipients[i].carbon_copy )
+				sieve_enotify_method_printf
+					(penv,   "       + Cc: %s\n", recipients[i].full);
+			else
+				sieve_enotify_method_printf
+					(penv,   "       + To: %s\n", recipients[i].full);
+		}
+	}
+
+	/* Print accepted headers for notification message */
+
+	headers = array_get(&mtctx->uri->headers, &count);
+	if ( count > 0 ) {
+		sieve_enotify_method_printf(penv,   "    => headers      :\n" );
+		for ( i = 0; i < count; i++ ) {
+			sieve_enotify_method_printf(penv,   "       + %s: %s\n",
+				headers[i].name, headers[i].body);
+		}
+	}
+
+	/* Print body for notification message */
+
+	if ( mtctx->uri->body != NULL )
+		sieve_enotify_method_printf
+			(penv, "    => body         : \n--\n%s\n--\n", mtctx->uri->body);
+
+	/* Finish output with an empty line */
+
+	sieve_enotify_method_printf(penv,   "\n");
+}
+
+/*
+ * Action execution
+ */
+
+static bool _contains_8bit(const char *msg)
+{
+	const unsigned char *s = (const unsigned char *)msg;
+
+	for (; *s != '\0'; s++) {
+		if ((*s & 0x80) != 0)
+			return TRUE;
+	}
+
+	return FALSE;
+}
+
+static int ntfy_mailto_send
+(const struct sieve_enotify_exec_env *nenv,
+	const struct sieve_enotify_action *nact,
+	const struct smtp_address *owner_email)
+{
+	struct sieve_instance *svinst = nenv->svinst;
+	const struct sieve_message_data *msgdata = nenv->msgdata;
+	const struct sieve_script_env *senv = nenv->scriptenv;
+	struct ntfy_mailto_context *mtctx =
+		(struct ntfy_mailto_context *) nact->method_context;
+	struct ntfy_mailto_config *mth_config =
+		(struct ntfy_mailto_config *)nenv->method->context;
+	struct sieve_address_source env_from =
+		mth_config->envelope_from;
+	const char *from = NULL;
+	const struct smtp_address *from_smtp = NULL;
+	const char *subject = mtctx->uri->subject;
+	const char *body = mtctx->uri->body;
+	string_t *to, *cc, *all;
+	const struct uri_mailto_recipient *recipients;
+	const struct uri_mailto_header_field *headers;
+	struct sieve_smtp_context *sctx;
+	struct ostream *output;
+	string_t *msg;
+	unsigned int count, i, hcount, h;
+	const char *outmsgid, *error;
+	int ret;
+
+	/* Get recipients */
+	recipients = array_get(&mtctx->uri->recipients, &count);
+	if ( count == 0  ) {
+		sieve_enotify_warning(nenv,
+			"notify mailto uri specifies no recipients; action has no effect");
+		return 0;
+	}
+
+	/* Just to be sure */
+	if ( !sieve_smtp_available(senv) ) {
+		sieve_enotify_global_warning(nenv,
+			"notify mailto method has no means to send mail");
+		return 0;
+	}
+
+	/* Determine which sender to use
+
+	   From RFC 5436, Section 2.3:
+
+		 The ":from" tag overrides the default sender of the notification
+		 message.  "Sender", here, refers to the value used in the [RFC5322]
+		 "From" header.  Implementations MAY also use this value in the
+		 [RFC5321] "MAIL FROM" command (the "envelope sender"), or they may
+		 prefer to establish a mailbox that receives bounces from notification
+		 messages.
+	 */
+	if ( (nenv->flags & SIEVE_EXECUTE_FLAG_NO_ENVELOPE) == 0 ) {
+		from_smtp = sieve_message_get_sender(nenv->msgctx);
+		if ( from_smtp == NULL ) {
+			/* "<>" */
+			i_zero(&env_from);
+			env_from.type = SIEVE_ADDRESS_SOURCE_EXPLICIT;
+		}
+	}
+	from = nact->from;
+	if ( (ret=sieve_address_source_get_address(&env_from, svinst,
+		senv, nenv->msgctx, nenv->flags, &from_smtp)) < 0 ) {
+		from_smtp = NULL;
+	} else if ( ret == 0 ) {
+		if ( mtctx->from_address != NULL )
+			from_smtp = mtctx->from_address;
+		else if ( svinst->user_email != NULL )
+			from_smtp = svinst->user_email;
+		else {
+			from_smtp = sieve_get_postmaster_smtp(senv);
+			if (from == NULL)
+				from = sieve_get_postmaster_address(senv);
+		}
+	}
+
+	/* Determine message from address */
+	if ( from == NULL ) {
+		if ( from_smtp == NULL )
+			from = sieve_get_postmaster_address(senv);
+		else {
+			from = t_strdup_printf("<%s>",
+				smtp_address_encode(from_smtp));
+		}
+	}
+
+	/* Determine subject */
+	if ( nact->message != NULL ) {
+		/* FIXME: handle UTF-8 */
+		subject = str_sanitize(nact->message, NTFY_MAILTO_MAX_SUBJECT);
+	} else if ( subject == NULL ) {
+		const char *const *hsubject;
+
+		/* Fetch subject from original message */
+		if ( mail_get_headers_utf8
+			(msgdata->mail, "subject", &hsubject) > 0 )
+			subject = str_sanitize(t_strdup_printf("Notification: %s", hsubject[0]),
+				NTFY_MAILTO_MAX_SUBJECT);
+		else
+			subject = "Notification: (no subject)";
+	}
+
+	/* Compose To and Cc headers */
+	to = NULL;
+	cc = NULL;
+	all = t_str_new(256);
+	for ( i = 0; i < count; i++ ) {
+		if ( recipients[i].carbon_copy ) {
+			if ( cc == NULL ) {
+				cc = t_str_new(256);
+				str_append(cc, recipients[i].full);
+			} else {
+				str_append(cc, ", ");
+				str_append(cc, recipients[i].full);
+			}
+		} else {
+			if ( to == NULL ) {
+				to = t_str_new(256);
+				str_append(to, recipients[i].full);
+			} else {
+				str_append(to, ", ");
+				str_append(to, recipients[i].full);
+			}
+		}
+		if ( i < 3) {
+			if ( i > 0 )
+				str_append(all, ", ");
+			str_append(all,
+				smtp_address_encode_path(recipients[i].address));
+		} else if (i == 3) {
+			str_printfa(all, ", ... (%u total)", count);
+		}
+	}
+
+	msg = t_str_new(512);
+	outmsgid = sieve_message_get_new_id(svinst);
+
+	rfc2822_header_write(msg, "X-Sieve", SIEVE_IMPLEMENTATION);
+	rfc2822_header_write(msg, "Message-ID", outmsgid);
+	rfc2822_header_write(msg, "Date", message_date_create(ioloop_time));
+	rfc2822_header_utf8_printf(msg, "Subject", "%s", subject);
+
+	rfc2822_header_write_address(msg, "From", from);
+
+	if ( to != NULL )
+		rfc2822_header_write_address(msg, "To", str_c(to));
+	if ( cc != NULL )
+		rfc2822_header_write_address(msg, "Cc", str_c(cc));
+
+	rfc2822_header_printf(msg, "Auto-Submitted",
+		"auto-notified; owner-email=\"%s\"",
+		smtp_address_encode(owner_email));
+	rfc2822_header_write(msg, "Precedence", "bulk");
+
+	/* Set importance */
+	switch ( nact->importance ) {
+	case 1:
+		rfc2822_header_write(msg, "X-Priority", "1 (Highest)");
+		rfc2822_header_write(msg, "Importance", "High");
+		break;
+	case 3:
+		rfc2822_header_write(msg, "X-Priority", "5 (Lowest)");
+		rfc2822_header_write(msg, "Importance", "Low");
+		break;
+	case 2:
+	default:
+		rfc2822_header_write(msg, "X-Priority", "3 (Normal)");
+		rfc2822_header_write(msg, "Importance", "Normal");
+		break;
+	}
+
+	/* Add custom headers */
+
+	headers = array_get(&mtctx->uri->headers, &hcount);
+	for ( h = 0; h < hcount; h++ ) {
+		const char *name = rfc2822_header_field_name_sanitize(headers[h].name);
+
+		rfc2822_header_write(msg, name, headers[h].body);
+	}
+
+	/* Generate message body */
+
+	rfc2822_header_write(msg, "MIME-Version", "1.0");
+	if ( body != NULL ) {
+		if (_contains_8bit(body)) {
+			rfc2822_header_write
+				(msg, "Content-Type", "text/plain; charset=utf-8");
+			rfc2822_header_write(msg, "Content-Transfer-Encoding", "8bit");
+		} else {
+			rfc2822_header_write
+				(msg, "Content-Type", "text/plain; charset=us-ascii");
+			rfc2822_header_write(msg, "Content-Transfer-Encoding", "7bit");
+		}
+		str_printfa(msg, "\r\n%s\r\n", body);
+
+	} else {
+		rfc2822_header_write
+			(msg, "Content-Type", "text/plain; charset=US-ASCII");
+		rfc2822_header_write(msg, "Content-Transfer-Encoding", "7bit");
+
+		str_append(msg, "\r\nNotification of new message.\r\n");
+	}
+
+	sctx = sieve_smtp_start(senv, from_smtp);
+
+	/* Send message to all recipients */
+	for ( i = 0; i < count; i++ )
+		sieve_smtp_add_rcpt(sctx, recipients[i].address);
+
+	output = sieve_smtp_send(sctx);
+	o_stream_nsend(output, str_data(msg), str_len(msg));
+
+	if ( (ret=sieve_smtp_finish(sctx, &error)) <= 0 ) {
+		if (ret < 0)  {
+			sieve_enotify_global_error(nenv,
+				"failed to send mail notification to %s: %s (temporary failure)",
+				str_c(all),	str_sanitize(error, 512));
+		} else {
+			sieve_enotify_global_log_error(nenv,
+				"failed to send mail notification to %s: %s (permanent failure)",
+				str_c(all),	str_sanitize(error, 512));
+		}
+	} else {
+		struct event_passthrough *e =
+			sieve_enotify_create_finish_event(nenv)->
+			add_str("notify_target", str_c(all));
+
+		sieve_enotify_event_log(nenv, e->event(),
+					"sent mail notification to %s",
+					str_c(all));
+	}
+
+	return 0;
+}
+
+static int ntfy_mailto_action_execute
+(const struct sieve_enotify_exec_env *nenv,
+	const struct sieve_enotify_action *nact)
+{
+	struct sieve_instance *svinst = nenv->svinst;
+	const struct sieve_script_env *senv = nenv->scriptenv;
+	struct mail *mail = nenv->msgdata->mail;
+	const struct smtp_address *owner_email;
+	const char *const *hdsp;
+	int ret;
+
+	owner_email = svinst->user_email;
+	if ( owner_email == NULL &&
+		(nenv->flags & SIEVE_EXECUTE_FLAG_NO_ENVELOPE) == 0 )
+		owner_email = sieve_message_get_final_recipient(nenv->msgctx);
+	if ( owner_email == NULL ) {
+		owner_email = sieve_get_postmaster_smtp(senv);
+	}
+	i_assert( owner_email != NULL );
+
+	/* Is the message an automatic reply ? */
+	if ( (ret=mail_get_headers(mail, "auto-submitted", &hdsp)) < 0 ) {
+		sieve_enotify_critical(nenv,
+			"mailto notification: "
+				"failed to read `auto-submitted' header field",
+			"mailto notification: "
+				"failed to read `auto-submitted' header field: %s",
+			mailbox_get_last_internal_error(mail->box, NULL));
+		return -1;
+	}
+
+	/* Theoretically multiple headers could exist, so lets make sure */
+	if ( ret > 0 ) {
+		while ( *hdsp != NULL ) {
+			if ( strcasecmp(*hdsp, "no") != 0 ) {
+				const struct smtp_address *sender = NULL;
+				const char *from;
+
+				if ( (nenv->flags & SIEVE_EXECUTE_FLAG_NO_ENVELOPE) == 0 )
+					sender = sieve_message_get_sender(nenv->msgctx);
+				from = (sender == NULL ? "" : t_strdup_printf
+						(" from <%s>", smtp_address_encode(sender)));
+
+				sieve_enotify_global_info(nenv,
+					"not sending notification "
+					"for auto-submitted message%s", from);
+				return 0;
+			}
+			hdsp++;
+		}
+	}
+
+	T_BEGIN {
+		ret = ntfy_mailto_send(nenv, nact, owner_email);
+	} T_END;
+
+	return ret;
+}
+
+
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/enotify/mailto/uri-mailto.c b/pigeonhole/src/lib-sieve/plugins/enotify/mailto/uri-mailto.c
new file mode 100644
index 0000000..c5a0953
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/enotify/mailto/uri-mailto.c
@@ -0,0 +1,683 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* FIXME: URI syntax conforms to something somewhere in between RFC 2368 and
+          draft-duerst-mailto-bis-05.txt. Should fully migrate to new
+          specification when it matures. This requires modifications to the
+          address parser (no whitespace allowed within the address itself) and
+          UTF-8 support will be required in the URL.
+ */
+
+#include "lib.h"
+#include "array.h"
+#include "str.h"
+#include "str-sanitize.h"
+
+#include "rfc2822.h"
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+#include "sieve-address.h"
+#include "sieve-message.h"
+
+#include "uri-mailto.h"
+
+/* Parser object */
+
+struct uri_mailto_parser {
+	pool_t pool;
+	const struct uri_mailto_log *log;
+
+	struct uri_mailto *uri;
+
+	const char **reserved_headers;
+	const char **unique_headers;
+
+	int max_recipients;
+	int max_headers;
+};
+
+/* Error handling */
+
+#define uri_mailto_error(PARSER, ...) \
+	uri_mailto_log((PARSER), LOG_TYPE_ERROR, \
+		       __FILE__, __LINE__, __VA_ARGS__)
+#define uri_mailto_warning(PARSER, ...) \
+	uri_mailto_log((PARSER), LOG_TYPE_WARNING, \
+		       __FILE__, __LINE__, __VA_ARGS__)
+
+static inline void ATTR_FORMAT(5, 6)
+uri_mailto_log(struct uri_mailto_parser *parser, enum log_type log_type,
+	       const char *csrc_filename, unsigned int csrc_linenum,
+	       const char *fmt, ...)
+{
+	va_list args;
+
+	if (parser->log == NULL || parser->log->logv == NULL)
+		return;
+
+	va_start(args, fmt);
+	parser->log->logv(parser->log->context, log_type,
+			  csrc_filename, csrc_linenum, fmt, args);
+	va_end(args);
+}
+
+
+/*
+ * Error handling
+ */
+
+/*
+ * Reserved and unique headers
+ */
+
+static inline bool
+uri_mailto_header_is_reserved(struct uri_mailto_parser *parser,
+			      const char *field_name)
+{
+	const char **hdr = parser->reserved_headers;
+
+	if (hdr == NULL)
+		return FALSE;
+
+	/* Check whether it is reserved */
+	while (*hdr != NULL) {
+		if (strcasecmp(field_name, *hdr) == 0)
+			return TRUE;
+		hdr++;
+	}
+	return FALSE;
+}
+
+static inline bool
+uri_mailto_header_is_unique(struct uri_mailto_parser *parser,
+			    const char *field_name)
+{
+	const char **hdr = parser->unique_headers;
+
+	if (hdr == NULL)
+		return FALSE;
+
+	/* Check whether it is supposed to be unique */
+	while (*hdr != NULL) {
+		if (strcasecmp(field_name, *hdr) == 0)
+			return TRUE;
+		hdr++;
+	}
+	return FALSE;
+}
+
+/*
+ * Low-level URI parsing.
+ *
+ * FIXME: much of this implementation will be common to other URI schemes. This
+ *        should be merged into a common implementation.
+ */
+
+static const char _qchar_lookup[256] = {
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // 00
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // 10
+	0, 1, 0, 0, 1, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 0,  // 20
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0,  // 30
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // 40
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1,  // 50
+	0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // 60
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0,  // 70
+
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // 80
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // 90
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // A0
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // B0
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // C0
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // D0
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // E0
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // F0
+};
+
+static inline bool _is_qchar(char c)
+{
+	return ((_qchar_lookup[(unsigned char)c] & 0x01) != 0);
+}
+
+static inline int _decode_hex_digit(unsigned char digit)
+{
+	switch (digit) {
+	case '0': case '1': case '2': case '3': case '4':
+	case '5': case '6': case '7': case '8': case '9':
+		return (int) digit - '0';
+	case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
+		return (int) digit - 'a' + 0x0a;
+	case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
+		return (int) digit - 'A' + 0x0A;
+	}
+	return -1;
+}
+
+static bool _parse_hex_value(const char **in, char *out)
+{
+	int value, digit;
+
+	if ((digit = _decode_hex_digit((unsigned char)**in)) < 0)
+		return FALSE;
+
+	value = digit << 4;
+	(*in)++;
+
+	if ((digit = _decode_hex_digit((unsigned char)**in)) < 0)
+		return FALSE;
+
+	value |= digit;
+	(*in)++;
+
+	if (value == 0)
+		return FALSE;
+
+	*out = (char)value;
+	return TRUE;
+}
+
+/*
+ * URI recipient parsing
+ */
+
+static bool
+uri_mailto_add_valid_recipient(struct uri_mailto_parser *parser,
+			       string_t *recipient, bool cc)
+{
+	struct uri_mailto *uri = parser->uri;
+	struct uri_mailto_recipient *new_recipient;
+	struct uri_mailto_recipient *rcpts;
+	unsigned int count, i;
+	const char *error;
+	const struct smtp_address *address;
+
+	/* Verify recipient */
+	if ((address = sieve_address_parse_str(recipient, &error)) == NULL) {
+		uri_mailto_error(parser, "invalid recipient '%s': %s",
+				 str_sanitize(str_c(recipient), 80), error);
+		return FALSE;
+	}
+
+	/* Add recipient to the uri */
+	if (uri != NULL) {
+		/* Get current recipients */
+		rcpts = array_get_modifiable(&uri->recipients, &count);
+
+		/* Enforce limits */
+		if (parser->max_recipients > 0 &&
+		    (int)count >= parser->max_recipients) {
+			if ((int)count == parser->max_recipients) {
+				uri_mailto_warning(
+					parser,
+					"more than the maximum %u recipients specified; "
+					"rest is discarded",
+					parser->max_recipients);
+			}
+			return TRUE;
+		}
+
+		/* Check for duplicate first */
+		for (i = 0; i < count; i++) {
+			if (smtp_address_equals(rcpts[i].address, address)) {
+				/* Upgrade existing Cc: recipient to a To:
+				   recipient if possible */
+				rcpts[i].carbon_copy =
+					(rcpts[i].carbon_copy && cc);
+
+				uri_mailto_warning(
+					parser,
+					"ignored duplicate recipient '%s'",
+					str_sanitize(str_c(recipient), 80));
+				return TRUE;
+			}
+		}
+
+		/* Add */
+		new_recipient = array_append_space(&uri->recipients);
+		new_recipient->carbon_copy = cc;
+		new_recipient->full = p_strdup(parser->pool, str_c(recipient));
+		new_recipient->address =
+			smtp_address_clone(parser->pool, address);
+	}
+
+	return TRUE;
+}
+
+static bool
+uri_mailto_parse_recipients(struct uri_mailto_parser *parser,
+			    const char **uri_p)
+{
+	string_t *to = t_str_new(128);
+	const char *p = *uri_p;
+
+	if (*p == '\0' || *p == '?')
+		return TRUE;
+
+	while (*p != '\0' && *p != '?') {
+		if (*p == '%') {
+			/* % encoded character */
+			char ch;
+
+			p++;
+
+			/* Parse 2-digit hex value */
+			if (!_parse_hex_value(&p, &ch)) {
+				uri_mailto_error(parser, "invalid %% encoding");
+				return FALSE;
+			}
+
+			/* Check for delimiter */
+			if (ch == ',') {
+				/* Verify and add recipient */
+				if (!uri_mailto_add_valid_recipient(
+					parser, to, FALSE))
+					return FALSE;
+
+				/* Reset for next recipient */
+				str_truncate(to, 0);
+			} else {
+				/* Content character */
+				str_append_c(to, ch);
+			}
+		} else {
+			if (*p == ':' || *p == ';' || *p == ',' ||
+			    !_is_qchar(*p)) {
+				uri_mailto_error(
+					parser,
+					"invalid character '%c' in 'to' part", *p);
+				return FALSE;
+			}
+
+			/* Content character */
+			str_append_c(to, *p);
+			p++;
+		}
+	}
+
+	i_assert(*p == '\0' || *p == '?');
+
+	/* Verify and add recipient */
+	if (!uri_mailto_add_valid_recipient(parser, to, FALSE))
+		return FALSE;
+
+	*uri_p = p;
+	return TRUE;
+}
+
+static bool
+uri_mailto_parse_header_recipients(struct uri_mailto_parser *parser,
+				   string_t *rcpt_header, bool cc)
+{
+	string_t *to = t_str_new(128);
+	const char *p = (const char *)str_data(rcpt_header);
+	const char *pend = p + str_len(rcpt_header);
+
+	while (p < pend) {
+		if (*p == ',') {
+			/* Verify and add recipient */
+			if (!uri_mailto_add_valid_recipient(parser, to, cc))
+				return FALSE;
+
+			/* Reset for next recipient */
+			str_truncate(to, 0);
+		} else {
+			/* Content character */
+			str_append_c(to, *p);
+		}
+		p++;
+	}
+
+	/* Verify and add recipient */
+	if (!uri_mailto_add_valid_recipient(parser, to, cc))
+		return FALSE;
+
+	return TRUE;
+}
+
+/* URI header parsing */
+
+static bool
+uri_mailto_header_is_duplicate(struct uri_mailto_parser *parser,
+			       const char *field_name)
+{
+	struct uri_mailto *uri = parser->uri;
+
+	if (uri == NULL)
+		return FALSE;
+
+	if (uri_mailto_header_is_unique(parser, field_name)) {
+		const struct uri_mailto_header_field *hdrs;
+		unsigned int count, i;
+
+		hdrs = array_get(&uri->headers, &count);
+		for (i = 0; i < count; i++) {
+			if (strcasecmp(hdrs[i].name, field_name) == 0)
+				return TRUE;
+		}
+	}
+	return FALSE;
+}
+
+static bool
+uri_mailto_parse_headers(struct uri_mailto_parser *parser, const char **uri_p)
+{
+	struct uri_mailto *uri = parser->uri;
+	unsigned int header_count = 0;
+	string_t *field = t_str_new(128);
+	const char *p = *uri_p;
+
+	while (*p != '\0') {
+		enum {
+			_HNAME_IGNORED,
+			_HNAME_GENERIC,
+			_HNAME_TO,
+			_HNAME_CC,
+			_HNAME_SUBJECT,
+			_HNAME_BODY,
+		} hname_type = _HNAME_GENERIC;
+		struct uri_mailto_header_field *hdrf = NULL;
+		const char *field_name;
+
+		/* Parse field name */
+		while (*p != '\0' && *p != '=') {
+			char ch = *p;
+			p++;
+
+			if (ch == '%') {
+				/* Encoded, parse 2-digit hex value */
+				if (!_parse_hex_value(&p, &ch)) {
+					uri_mailto_error(parser,
+							 "invalid %% encoding");
+					return FALSE;
+				}
+			} else if (ch != '=' && !_is_qchar(ch)) {
+				uri_mailto_error(
+					parser,
+					"invalid character '%c' in header field name part",
+					ch);
+				return FALSE;
+			}
+
+			str_append_c(field, ch);
+		}
+		if (*p != '\0')
+			p++;
+
+		/* Verify field name */
+		if (!rfc2822_header_field_name_verify(str_c(field),
+						      str_len(field))) {
+			uri_mailto_error(parser, "invalid header field name");
+			return FALSE;
+		}
+
+		if (parser->max_headers > -1 &&
+		    (int)header_count >= parser->max_headers) {
+			/* Refuse to accept more headers than allowed by policy
+			 */
+			if ((int)header_count == parser->max_headers) {
+				uri_mailto_warning(
+					parser,
+					"more than the maximum %u headers specified; "
+					"rest is discarded",
+					parser->max_headers);
+			}
+
+			hname_type = _HNAME_IGNORED;
+		} else {
+			/* Add new header field to array and assign its name */
+
+			field_name = str_c(field);
+			if (strcasecmp(field_name, "to") == 0)
+				hname_type = _HNAME_TO;
+			else if (strcasecmp(field_name, "cc") == 0)
+				hname_type = _HNAME_CC;
+			else if (strcasecmp(field_name, "subject") == 0)
+				hname_type = _HNAME_SUBJECT;
+			else if (strcasecmp(field_name, "body") == 0)
+				hname_type = _HNAME_BODY;
+			else if (!uri_mailto_header_is_reserved(parser, field_name)) {
+				if (uri != NULL) {
+					if (!uri_mailto_header_is_duplicate(parser, field_name)) {
+						hdrf = array_append_space(&uri->headers);
+						hdrf->name = p_strdup(parser->pool, field_name);
+					} else {
+						uri_mailto_warning(
+							parser,
+							"ignored duplicate for unique header field '%s'",
+							str_sanitize(field_name, 32));
+						hname_type = _HNAME_IGNORED;
+					}
+				} else {
+					hname_type = _HNAME_IGNORED;
+				}
+			} else {
+				uri_mailto_warning(
+					parser,
+					"ignored reserved header field '%s'",
+					str_sanitize(field_name, 32));
+				hname_type = _HNAME_IGNORED;
+			}
+		}
+
+		header_count++;
+
+		/* Reset for field body */
+		str_truncate(field, 0);
+
+		/* Parse field body */
+		while (*p != '\0' && *p != '&') {
+			char ch = *p;
+			p++;
+
+			if (ch == '%') {
+				/* Encoded, parse 2-digit hex value */
+				if (!_parse_hex_value(&p, &ch)) {
+					uri_mailto_error(parser,
+							 "invalid %% encoding");
+					return FALSE;
+				}
+			} else if (ch != '=' && !_is_qchar(ch)) {
+				uri_mailto_error(
+					parser,
+					"invalid character '%c' in header field value part",
+					ch);
+				return FALSE;
+			}
+			str_append_c(field, ch);
+		}
+		if (*p != '\0')
+			p++;
+
+		/* Verify field body */
+		if (hname_type == _HNAME_BODY) {
+			// FIXME: verify body ...
+		} else {
+			if (!rfc2822_header_field_body_verify(
+				str_c(field), str_len(field), FALSE, FALSE)) {
+				uri_mailto_error(parser,
+						 "invalid header field body");
+				return FALSE;
+			}
+		}
+
+		/* Assign field body */
+
+		switch (hname_type) {
+		case _HNAME_IGNORED:
+			break;
+		case _HNAME_TO:
+			/* Gracefully allow duplicate To fields */
+			if (!uri_mailto_parse_header_recipients(
+				parser, field, FALSE))
+				return FALSE;
+			break;
+		case _HNAME_CC:
+			/* Gracefully allow duplicate Cc fields */
+			if (!uri_mailto_parse_header_recipients(
+				parser, field, TRUE))
+				return FALSE;
+			break;
+		case _HNAME_SUBJECT:
+			/* Ignore duplicate subject field */
+			if (uri != NULL) {
+				if (uri->subject == NULL) {
+					uri->subject =
+						p_strdup(parser->pool, str_c(field));
+				} else {
+					uri_mailto_warning(
+						parser,
+						"ignored duplicate subject field");
+				}
+			}
+			break;
+		case _HNAME_BODY:
+			/* Ignore duplicate body field */
+			if (uri != NULL) {
+				if (uri->body == NULL) {
+					uri->body = p_strdup(
+						parser->pool, str_c(field));
+				} else {
+					uri_mailto_warning(
+						parser, "ignored duplicate body field");
+				}
+			}
+			break;
+		case _HNAME_GENERIC:
+			if (uri != NULL && hdrf != NULL)
+				hdrf->body = p_strdup(parser->pool, str_c(field));
+			break;
+		}
+
+		/* Reset for next name */
+		str_truncate(field, 0);
+	}
+
+	/* Skip '&' */
+	if (*p != '\0')
+		p++;
+
+	*uri_p = p;
+	return TRUE;
+}
+
+static bool
+uri_mailto_parse_uri(struct uri_mailto_parser *parser, const char *uri_body)
+{
+	const char *p = uri_body;
+
+	/*
+	 * mailtoURI   = "mailto:" [ to ] [ hfields ]
+	 * to          = [ addr-spec *("%2C" addr-spec ) ]
+	 * hfields     = "?" hfield *( "&" hfield )
+	 * hfield      = hfname "=" hfvalue
+	 * hfname      = *qchar
+	 * hfvalue     = *qchar
+	 * addr-spec   = local-part "@" domain
+	 * local-part  = dot-atom / quoted-string
+	 * qchar       = unreserved / pct-encoded / some-delims
+	 * some-delims = "!" / "$" / "'" / "(" / ")" / "*"
+	 *               / "+" / "," / ";" / ":" / "@"
+	 *
+	 * to         ~= *tqchar
+	 * tqchar     ~= <qchar> without ";" and ":"
+	 *
+	 * Scheme 'mailto:' already parsed, starting parse after colon
+	 */
+
+	/* First extract to-part by searching for '?' and decoding % items
+	 */
+
+	if (!uri_mailto_parse_recipients(parser, &p))
+		return FALSE;
+
+	if (*p == '\0')
+		return TRUE;
+	i_assert(*p == '?');
+	p++;
+
+	/* Extract hfield items */
+
+	while (*p != '\0') {
+		/* Extract hfield item by searching for '&' and decoding '%'
+		   items */
+		if (!uri_mailto_parse_headers(parser, &p))
+			return FALSE;
+	}
+	return TRUE;
+}
+
+/*
+ * Validation
+ */
+
+bool uri_mailto_validate(const char *uri_body,
+			 const char **reserved_headers,
+			 const char **unique_headers, int max_recipients,
+			 int max_headers, const struct uri_mailto_log *log)
+{
+	struct uri_mailto_parser parser;
+
+	i_zero(&parser);
+	parser.log = log;
+	parser.max_recipients = max_recipients;
+	parser.max_headers = max_headers;
+	parser.reserved_headers = reserved_headers;
+	parser.unique_headers = unique_headers;
+
+	/* If no errors are reported, we don't need to record any data */
+	if (log != NULL) {
+		parser.pool = pool_datastack_create();
+
+		parser.uri = p_new(parser.pool, struct uri_mailto, 1);
+		p_array_init(&parser.uri->recipients, parser.pool, max_recipients);
+		p_array_init(&parser.uri->headers, parser.pool, max_headers);
+	}
+
+	if (!uri_mailto_parse_uri(&parser, uri_body))
+		return FALSE;
+
+	if (log != NULL) {
+		if (array_count(&parser.uri->recipients) == 0) {
+			uri_mailto_warning(
+				&parser,
+				"notification URI specifies no recipients");
+		}
+	}
+	return TRUE;
+}
+
+/*
+ * Parsing
+ */
+
+struct uri_mailto *
+uri_mailto_parse(const char *uri_body, pool_t pool,
+		 const char **reserved_headers, const char **unique_headers,
+		 int max_recipients, int max_headers,
+		 const struct uri_mailto_log *log)
+{
+	struct uri_mailto_parser parser;
+
+	parser.pool = pool;
+	parser.log = log;
+	parser.max_recipients = max_recipients;
+	parser.max_headers = max_headers;
+	parser.reserved_headers = reserved_headers;
+	parser.unique_headers = unique_headers;
+
+	parser.uri = p_new(pool, struct uri_mailto, 1);
+	p_array_init(&parser.uri->recipients, pool, max_recipients);
+	p_array_init(&parser.uri->headers, pool, max_headers);
+
+	if (!uri_mailto_parse_uri(&parser, uri_body))
+		return NULL;
+
+	if (log != NULL) {
+		if (array_count(&parser.uri->recipients) == 0) {
+			uri_mailto_warning(
+				&parser,
+				"notification URI specifies no recipients");
+		}
+	}
+	return parser.uri;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/enotify/mailto/uri-mailto.h b/pigeonhole/src/lib-sieve/plugins/enotify/mailto/uri-mailto.h
new file mode 100644
index 0000000..8e9e057
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/enotify/mailto/uri-mailto.h
@@ -0,0 +1,49 @@
+#ifndef URI_MAILTO_H
+#define URI_MAILTO_H
+
+/*
+ * Types
+ */
+
+struct uri_mailto_header_field {
+	const char *name;
+	const char *body;
+};
+
+struct uri_mailto_recipient {
+	const char *full;
+	const struct smtp_address *address;
+	bool carbon_copy;
+};
+
+ARRAY_DEFINE_TYPE(recipients, struct uri_mailto_recipient);
+ARRAY_DEFINE_TYPE(headers, struct uri_mailto_header_field);
+
+struct uri_mailto_log {
+	void *context;
+
+	void (*logv)(void *context, enum log_type log_type,
+		     const char *csrc_filename, unsigned int csrc_linenum,
+		     const char *fmt, va_list args) ATTR_FORMAT(5, 0);
+};
+
+struct uri_mailto {
+	ARRAY_TYPE(recipients) recipients;
+	ARRAY_TYPE(headers) headers;
+	const char *subject;
+	const char *body;
+};
+
+bool uri_mailto_validate
+	(const char *uri_body, const char **reserved_headers,
+		const char **unique_headers, int max_recipients, int max_headers,
+		const struct uri_mailto_log *log);
+
+struct uri_mailto *uri_mailto_parse
+(const char *uri_body, pool_t pool, const char **reserved_headers,
+	const char **unique_headers, int max_recipients, int max_headers,
+	const struct uri_mailto_log *log);
+
+#endif
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/enotify/sieve-ext-enotify.h b/pigeonhole/src/lib-sieve/plugins/enotify/sieve-ext-enotify.h
new file mode 100644
index 0000000..fd8b574
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/enotify/sieve-ext-enotify.h
@@ -0,0 +1,197 @@
+#ifndef SIEVE_EXT_ENOTIFY_H
+#define SIEVE_EXT_ENOTIFY_H
+
+#include "lib.h"
+#include "compat.h"
+#include <stdarg.h>
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+
+/*
+ * Forward declarations
+ */
+
+struct sieve_enotify_method;
+struct sieve_enotify_env;
+struct sieve_enotify_action;
+struct sieve_enotify_print_env;
+struct sieve_enotify_exec_env;
+
+/*
+ * Notify method definition
+ */
+
+struct sieve_enotify_method_def {
+	const char *identifier;
+
+	/* Registration */
+	bool (*load)
+		(const struct sieve_enotify_method *nmth, void **context);
+	void (*unload)
+		(const struct sieve_enotify_method *nmth);
+
+	/* Validation */
+	bool (*compile_check_uri)
+		(const struct sieve_enotify_env *nenv, const char *uri,
+			const char *uri_body);
+	bool (*compile_check_message)
+		(const struct sieve_enotify_env *nenv, string_t *message);
+	bool (*compile_check_from)
+		(const struct sieve_enotify_env *nenv, string_t *from);
+	bool (*compile_check_option)
+		(const struct sieve_enotify_env *nenv, const char *option,
+			const char *value);
+
+	/* Runtime */
+	bool (*runtime_check_uri)
+		(const struct sieve_enotify_env *nenv, const char *uri,
+			const char *uri_body);
+	const char *(*runtime_get_method_capability)
+		(const struct sieve_enotify_env *nenv, const char *uri,
+			const char *uri_body, const char *capability);
+	bool (*runtime_check_operands)
+		(const struct sieve_enotify_env *nenv, const char *uri,
+			const char *uri_body, string_t *message, string_t *from,
+			pool_t context_pool, void **method_context);
+	bool (*runtime_set_option)
+		(const struct sieve_enotify_env *nenv, void *method_context,
+			const char *option, const char *value);
+
+	/* Action duplicates */
+	int (*action_check_duplicates)
+		(const struct sieve_enotify_env *nenv,
+			const struct sieve_enotify_action *nact,
+			const struct sieve_enotify_action *nact_other);
+
+	/* Action print */
+	void (*action_print)
+		(const struct sieve_enotify_print_env *penv,
+			const struct sieve_enotify_action *nact);
+
+	/* Action execution
+     (returns 0 if all is ok and -1 for temporary error)
+	 */
+	int (*action_execute)
+		(const struct sieve_enotify_exec_env *nenv,
+			const struct sieve_enotify_action *nact);
+};
+
+/*
+ * Notify method instance
+ */
+
+struct sieve_enotify_method {
+	const struct sieve_enotify_method_def *def;
+	int id;
+
+	struct sieve_instance *svinst;
+	void *context;
+};
+
+const struct sieve_enotify_method *sieve_enotify_method_register
+	(struct sieve_instance *svinst,
+		const struct sieve_enotify_method_def *nmth_def);
+void  sieve_enotify_method_unregister
+	(const struct sieve_enotify_method *nmth);
+
+/*
+ * Notify method environment
+ */
+
+struct sieve_enotify_env {
+	struct sieve_instance *svinst;
+
+	const struct sieve_enotify_method *method;
+
+	struct sieve_error_handler *ehandler;
+	const char *location;
+	struct event *event;
+};
+
+/*
+ * Notify method printing
+ */
+
+void sieve_enotify_method_printf
+	(const struct sieve_enotify_print_env *penv, const char *fmt, ...)
+		ATTR_FORMAT(2, 3);
+
+/*
+ * Notify execution environment
+ */
+
+struct sieve_enotify_exec_env {
+	struct sieve_instance *svinst;
+	enum sieve_execute_flags flags;
+
+	const struct sieve_enotify_method *method;
+
+	const struct sieve_script_env *scriptenv;
+	const struct sieve_message_data *msgdata;
+	struct sieve_message_context *msgctx;
+
+	struct sieve_error_handler *ehandler;
+	const char *location;
+	struct event *event;
+};
+
+struct event_passthrough *
+sieve_enotify_create_finish_event(const struct sieve_enotify_exec_env *nenv);
+
+/*
+ * Notify action
+ */
+
+struct sieve_enotify_action {
+	const struct sieve_enotify_method *method;
+	void *method_context;
+
+	sieve_number_t importance;
+	const char *message;
+	const char *from;
+};
+
+/*
+ * Error handling
+ */
+
+#define sieve_enotify_error(ENV, ...) \
+	sieve_event_log((ENV)->svinst, (ENV)->ehandler, (ENV)->event, \
+			LOG_TYPE_ERROR, (ENV)->location, 0, __VA_ARGS__ )
+#define sieve_enotify_warning(ENV, ...) \
+	sieve_event_log((ENV)->svinst, (ENV)->ehandler, (ENV)->event, \
+			LOG_TYPE_WARNING, \
+			(ENV)->location, 0, __VA_ARGS__ )
+#define sieve_enotify_info(ENV, ...) \
+	sieve_event_log((ENV)->svinst, (ENV)->ehandler, (ENV)->event, \
+			LOG_TYPE_INFO, \
+			(ENV)->location, 0, __VA_ARGS__ )
+#define sieve_enotify_critical(ENV, ...) \
+	sieve_critical((ENV)->svinst, (ENV)->ehandler, NULL, __VA_ARGS__ )
+
+#define sieve_enotify_global_error(ENV, ...) \
+	sieve_event_log((ENV)->svinst, (ENV)->ehandler, (ENV)->event, \
+			LOG_TYPE_ERROR, (ENV)->location, \
+			SIEVE_ERROR_FLAG_GLOBAL, __VA_ARGS__ )
+#define sieve_enotify_global_warning(ENV, ...) \
+	sieve_event_log((ENV)->svinst, (ENV)->ehandler, (ENV)->event, \
+			LOG_TYPE_WARNING, (ENV)->location, \
+			SIEVE_ERROR_FLAG_GLOBAL, __VA_ARGS__ )
+#define sieve_enotify_global_info(ENV, ...) \
+	sieve_event_log((ENV)->svinst, (ENV)->ehandler, (ENV)->event, \
+			LOG_TYPE_INFO, (ENV)->location, \
+			SIEVE_ERROR_FLAG_GLOBAL, __VA_ARGS__ )
+
+#define sieve_enotify_event_log(ENV, EVENT, ...) \
+	sieve_event_log((ENV)->svinst, (ENV)->ehandler, (EVENT), \
+			LOG_TYPE_INFO, (ENV)->location, \
+			SIEVE_ERROR_FLAG_GLOBAL, __VA_ARGS__ )
+
+#define sieve_enotify_global_log_error(ENV, ...) \
+	sieve_event_log((ENV)->svinst, (ENV)->ehandler, (ENV)->event, \
+			LOG_TYPE_ERROR, (ENV)->location, \
+			(SIEVE_ERROR_FLAG_GLOBAL | \
+			 SIEVE_ERROR_FLAG_GLOBAL_MAX_INFO), __VA_ARGS__ )
+#endif
+
diff --git a/pigeonhole/src/lib-sieve/plugins/enotify/tst-notify-method-capability.c b/pigeonhole/src/lib-sieve/plugins/enotify/tst-notify-method-capability.c
new file mode 100644
index 0000000..8a6c071
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/enotify/tst-notify-method-capability.c
@@ -0,0 +1,233 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-match.h"
+
+#include "ext-enotify-common.h"
+
+/*
+ * String test
+ *
+ * Syntax:
+ *   notify_method_capability [COMPARATOR] [MATCH-TYPE]
+ *     <notification-uri: string>
+ *     <notification-capability: string>
+ *     <key-list: string-list>
+ */
+
+static bool tst_notifymc_registered
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+static bool tst_notifymc_validate
+	(struct sieve_validator *valdtr, struct sieve_command *tst);
+static bool tst_notifymc_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx);
+
+const struct sieve_command_def notify_method_capability_test = {
+	.identifier = "notify_method_capability",
+	.type = SCT_TEST,
+	.positional_args = 3,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = tst_notifymc_registered,
+	.validate = tst_notifymc_validate,
+	.generate = tst_notifymc_generate
+};
+
+/*
+ * String operation
+ */
+
+static bool tst_notifymc_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int tst_notifymc_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def notify_method_capability_operation = {
+	.mnemonic = "NOTIFY_METHOD_CAPABILITY",
+	.ext_def = &enotify_extension,
+	.code = EXT_ENOTIFY_OPERATION_NOTIFY_METHOD_CAPABILITY,
+	.dump = tst_notifymc_operation_dump,
+	.execute = tst_notifymc_operation_execute
+};
+
+/*
+ * Optional arguments
+ */
+
+enum tst_notifymc_optional {
+	OPT_END,
+	OPT_COMPARATOR,
+	OPT_MATCH_TYPE
+};
+
+/*
+ * Test registration
+ */
+
+static bool tst_notifymc_registered
+(struct sieve_validator *valdtr, const struct sieve_extension *ext ATTR_UNUSED,
+	struct sieve_command_registration *cmd_reg)
+{
+	/* The order of these is not significant */
+	sieve_comparators_link_tag(valdtr, cmd_reg, OPT_COMPARATOR);
+	sieve_match_types_link_tags(valdtr, cmd_reg, OPT_MATCH_TYPE);
+
+	return TRUE;
+}
+
+/*
+ * Test validation
+ */
+
+static bool tst_notifymc_validate
+(struct sieve_validator *valdtr, struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+	const struct sieve_match_type mcht_default =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	const struct sieve_comparator cmp_default =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "notification-uri", 1, SAAT_STRING) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, tst, arg, FALSE) )
+		return FALSE;
+
+	arg = sieve_ast_argument_next(arg);
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "notification-capability", 2, SAAT_STRING) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, tst, arg, FALSE) )
+		return FALSE;
+
+	arg = sieve_ast_argument_next(arg);
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "key-list", 3, SAAT_STRING_LIST) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, tst, arg, FALSE) )
+		return FALSE;
+
+	/* Validate the key argument to a specified match type */
+	return sieve_match_type_validate
+		(valdtr, tst, arg, &mcht_default, &cmp_default);
+}
+
+/*
+ * Test generation
+ */
+
+static bool tst_notifymc_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	sieve_operation_emit
+		(cgenv->sblock, cmd->ext, &notify_method_capability_operation);
+
+ 	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, cmd, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool tst_notifymc_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "NOTIFY_METHOD_CAPABILITY");
+	sieve_code_descend(denv);
+
+	/* Handle any optional arguments */
+	if ( sieve_match_opr_optional_dump(denv, address, NULL) != 0 )
+		return FALSE;
+
+	return
+		sieve_opr_string_dump(denv, address, "notify uri") &&
+		sieve_opr_string_dump(denv, address, "notify capability") &&
+		sieve_opr_stringlist_dump(denv, address, "key list");
+}
+
+/*
+ * Code execution
+ */
+
+static int tst_notifymc_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	struct sieve_match_type mcht =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	struct sieve_comparator cmp =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+	string_t *notify_uri, *notify_capability;
+	struct sieve_stringlist *value_list, *key_list;
+	const char *cap_value;
+	int match, ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Handle match-type and comparator operands */
+	if ( sieve_match_opr_optional_read
+		(renv, address, NULL, &ret, &cmp, &mcht) < 0 )
+		return ret;
+
+	/* Read notify uri */
+	if ( (ret=sieve_opr_string_read(renv, address, "notify-uri", &notify_uri))
+		<= 0 )
+		return ret;
+
+	/* Read notify capability */
+	if ( (ret=sieve_opr_string_read
+		(renv, address, "notify-capability", &notify_capability)) <= 0 )
+		return ret;
+
+	/* Read key-list */
+	if ( (ret=sieve_opr_stringlist_read(renv, address, "key-list", &key_list))
+		<= 0)
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS, "notify_method_capability test");
+
+	cap_value = ext_enotify_runtime_get_method_capability
+		(renv, notify_uri, str_c(notify_capability));
+
+	if ( cap_value != NULL ) {
+		value_list = sieve_single_stringlist_create_cstr(renv, cap_value, TRUE);
+
+		/* Perform match */
+		if ( (match=sieve_match(renv, &mcht, &cmp, value_list, key_list, &ret))
+			< 0 )
+			return ret;
+	} else {
+		match = 0;
+	}
+
+	/* Set test result for subsequent conditional jump */
+	sieve_interpreter_set_test_result(renv->interp, match > 0);
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/enotify/tst-valid-notify-method.c b/pigeonhole/src/lib-sieve/plugins/enotify/tst-valid-notify-method.c
new file mode 100644
index 0000000..becc41c
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/enotify/tst-valid-notify-method.c
@@ -0,0 +1,144 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-match.h"
+
+#include "ext-enotify-common.h"
+
+/*
+ * Valid_notify_method test
+ *
+ * Syntax:
+ *   valid_notify_method <notification-uris: string-list>
+ */
+
+static bool tst_vnotifym_validate
+	(struct sieve_validator *valdtr, struct sieve_command *tst);
+static bool tst_vnotifym_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx);
+
+const struct sieve_command_def valid_notify_method_test = {
+	.identifier = "valid_notify_method",
+	.type = SCT_TEST,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = tst_vnotifym_validate,
+	.generate = tst_vnotifym_generate
+};
+
+/*
+ * Valid_notify_method operation
+ */
+
+static bool tst_vnotifym_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int tst_vnotifym_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def valid_notify_method_operation = {
+	.mnemonic = "VALID_NOTIFY_METHOD",
+	.ext_def = &enotify_extension,
+	.code = EXT_ENOTIFY_OPERATION_VALID_NOTIFY_METHOD,
+	.dump = tst_vnotifym_operation_dump,
+	.execute = tst_vnotifym_operation_execute
+};
+
+/*
+ * Test validation
+ */
+
+static bool tst_vnotifym_validate
+	(struct sieve_validator *valdtr, struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "notification-uris", 1, SAAT_STRING_LIST) ) {
+		return FALSE;
+	}
+
+	return sieve_validator_argument_activate(valdtr, tst, arg, FALSE);
+}
+
+/*
+ * Test generation
+ */
+
+static bool tst_vnotifym_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &valid_notify_method_operation);
+
+ 	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, cmd, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool tst_vnotifym_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "VALID_NOTIFY_METHOD");
+	sieve_code_descend(denv);
+
+	return
+		sieve_opr_stringlist_dump(denv, address, "notify-uris");
+}
+
+/*
+ * Code execution
+ */
+
+static int tst_vnotifym_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	struct sieve_stringlist *notify_uris;
+	string_t *uri_item;
+	bool all_valid = TRUE;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Read notify uris */
+	if ( (ret=sieve_opr_stringlist_read
+		(renv, address, "notify-uris", &notify_uris)) <= 0 )
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS, "valid_notify_method test");
+
+	uri_item = NULL;
+	while ( (ret=sieve_stringlist_next_item(notify_uris, &uri_item)) > 0 ) {
+		if ( !ext_enotify_runtime_method_validate(renv, uri_item) ) {
+			all_valid = FALSE;
+			break;
+		}
+	}
+
+	if ( ret < 0 ) {
+		sieve_runtime_trace_error(renv, "invalid method uri item");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	sieve_interpreter_set_test_result(renv->interp, all_valid);
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/enotify/vmodf-encodeurl.c b/pigeonhole/src/lib-sieve/plugins/enotify/vmodf-encodeurl.c
new file mode 100644
index 0000000..801f882
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/enotify/vmodf-encodeurl.c
@@ -0,0 +1,119 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "unichar.h"
+#include "str.h"
+
+#include "sieve-common.h"
+#include "sieve-code.h"
+
+#include "sieve-ext-variables.h"
+
+#include "ext-enotify-common.h"
+
+/*
+ * Encodeurl modifier
+ */
+
+static bool
+mod_encodeurl_modify(const struct sieve_variables_modifier *modf,
+		     string_t *in, string_t **result);
+
+const struct sieve_variables_modifier_def encodeurl_modifier = {
+	SIEVE_OBJECT("encodeurl", &encodeurl_operand, 0),
+	15,
+	mod_encodeurl_modify
+};
+
+/*
+ * Modifier operand
+ */
+
+static const struct sieve_extension_objects ext_enotify_modifiers =
+	SIEVE_VARIABLES_DEFINE_MODIFIER(encodeurl_modifier);
+
+const struct sieve_operand_def encodeurl_operand = {
+	.name = "modifier",
+	.ext_def = &enotify_extension,
+	.class = &sieve_variables_modifier_operand_class,
+	.interface = &ext_enotify_modifiers
+};
+
+/*
+ * Modifier implementation
+ */
+
+static const char _uri_reserved_lookup[256] = {
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // 00
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // 10
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 1,  // 20
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1,  // 30
+	1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // 40
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 0,  // 50
+	1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  // 60
+	0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1,  // 70
+
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // 80
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // 90
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // A0
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // B0
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // C0
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // D0
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // E0
+	1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  // F0
+};
+
+static bool
+mod_encodeurl_modify(const struct sieve_variables_modifier *modf,
+		     string_t *in, string_t **result)
+{
+	size_t max_var_size =
+		sieve_variables_get_max_variable_size(modf->var_ext);
+	const unsigned char *p, *poff, *pend;
+	size_t new_size;
+
+	if ( str_len(in) == 0 ) {
+		*result = in;
+		return TRUE;
+	}
+
+	/* allocate new string */
+	new_size = str_len(in) + 32;
+	if (new_size > max_var_size)
+		new_size = max_var_size;
+	*result = t_str_new(new_size + 1);
+
+	/* escape string */
+	p = str_data(in);
+	pend = p + str_len(in);
+	poff = p;
+	while (p < pend) {
+		unsigned int i, n = uni_utf8_char_bytes(*p);
+
+		if (n > 1 || (_uri_reserved_lookup[*p] & 0x01) != 0) {
+			str_append_data(*result, poff, p - poff);
+			poff = p;
+
+			if (str_len(*result) + 3 * n > max_var_size)
+				break;
+
+			str_printfa(*result, "%%%02X", *p);
+			for (i = 1; i < n && p < pend; i++) {
+				p++;
+				poff++;
+				str_printfa(*result, "%%%02X", *p);
+			}
+
+			poff++;
+		} else if ((str_len(*result) + (p - poff) + 1) > max_var_size) {
+			break;
+		}
+		p++;
+	}
+
+	str_append_data(*result, poff, p - poff);
+	return TRUE;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/environment/Makefile.am b/pigeonhole/src/lib-sieve/plugins/environment/Makefile.am
new file mode 100644
index 0000000..916362e
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/environment/Makefile.am
@@ -0,0 +1,24 @@
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+
+AM_CPPFLAGS = \
+	-I$(srcdir)/../.. \
+	$(LIBDOVECOT_INCLUDE)
+
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+	tst-environment.c
+
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+	$(tests) \
+	ext-environment-common.c \
+	ext-environment.c
+
+public_headers = \
+	sieve-ext-environment.h
+
+headers = \
+	ext-environment-common.h
+
+pkginc_libdir=$(dovecot_pkgincludedir)/sieve
+pkginc_lib_HEADERS = $(public_headers)
+noinst_HEADERS = $(headers)
+
diff --git a/pigeonhole/src/lib-sieve/plugins/environment/Makefile.in b/pigeonhole/src/lib-sieve/plugins/environment/Makefile.in
new file mode 100644
index 0000000..68424f4
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/environment/Makefile.in
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+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
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+	}
+
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+
+mostlyclean-compile:
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+distclean-compile:
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+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-environment-common.Plo@am__quote@ # am--include-marker
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+
+$(am__depfiles_remade):
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+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
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+
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+	done
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+	esac; \
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+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
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+	esac; \
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+		-rm -f ./$(DEPDIR)/ext-environment-common.Plo
+	-rm -f ./$(DEPDIR)/ext-environment.Plo
+	-rm -f ./$(DEPDIR)/tst-environment.Plo
+	-rm -f Makefile
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+	-rm -f Makefile
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+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/environment/ext-environment-common.c b/pigeonhole/src/lib-sieve/plugins/environment/ext-environment-common.c
new file mode 100644
index 0000000..28d4251
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/environment/ext-environment-common.c
@@ -0,0 +1,339 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "hash.h"
+
+#include "sieve-common.h"
+#include "sieve-extensions.h"
+#include "sieve-interpreter.h"
+
+#include "ext-environment-common.h"
+
+struct ext_environment_interpreter_context;
+
+/*
+ * Core environment items
+ */
+
+static const struct sieve_environment_item *core_env_items[] = {
+	&domain_env_item,
+	&host_env_item,
+	&location_env_item,
+	&phase_env_item,
+	&name_env_item,
+	&version_env_item
+};
+
+static unsigned int core_env_items_count = N_ELEMENTS(core_env_items);
+
+static void
+sieve_environment_item_insert(struct ext_environment_interpreter_context *ctx,
+			      const struct sieve_environment_item *item);
+
+/*
+ * Validator context
+ */
+
+struct ext_environment_interpreter_context {
+	HASH_TABLE(const char *,
+		   const struct sieve_environment_item *) name_items;
+	ARRAY(const struct sieve_environment_item *) prefix_items;
+
+	bool active:1;
+};
+
+static void
+ext_environment_interpreter_extension_free(const struct sieve_extension *ext,
+					   struct sieve_interpreter *interp,
+					   void *context);
+
+struct sieve_interpreter_extension environment_interpreter_extension = {
+	.ext_def = &environment_extension,
+	.free = ext_environment_interpreter_extension_free,
+};
+
+static struct ext_environment_interpreter_context *
+ext_environment_interpreter_context_create(
+	const struct sieve_extension *this_ext,
+	struct sieve_interpreter *interp)
+{
+	pool_t pool = sieve_interpreter_pool(interp);
+	struct ext_environment_interpreter_context *ctx;
+
+	ctx = p_new(pool, struct ext_environment_interpreter_context, 1);
+
+	hash_table_create(&ctx->name_items, default_pool, 0, str_hash, strcmp);
+	i_array_init(&ctx->prefix_items, 16);
+
+	sieve_interpreter_extension_register(interp, this_ext,
+					     &environment_interpreter_extension,
+					     (void *)ctx);
+	return ctx;
+}
+
+static void
+ext_environment_interpreter_extension_free(
+	const struct sieve_extension *ext ATTR_UNUSED,
+	struct sieve_interpreter *interp ATTR_UNUSED, void *context)
+{
+	struct ext_environment_interpreter_context *ctx =
+		(struct ext_environment_interpreter_context *)context;
+
+	hash_table_destroy(&ctx->name_items);
+	array_free(&ctx->prefix_items);
+}
+
+static struct ext_environment_interpreter_context *
+ext_environment_interpreter_context_get(const struct sieve_extension *this_ext,
+					struct sieve_interpreter *interp)
+{
+	struct ext_environment_interpreter_context *ctx =
+		(struct ext_environment_interpreter_context *)
+		sieve_interpreter_extension_get_context(interp, this_ext);
+
+	if (ctx == NULL) {
+		ctx = ext_environment_interpreter_context_create(
+			this_ext, interp);
+	}
+	return ctx;
+}
+
+void ext_environment_interpreter_init(const struct sieve_extension *this_ext,
+				      struct sieve_interpreter *interp)
+{
+	struct ext_environment_interpreter_context *ctx;
+	unsigned int i;
+
+	/* Create our context */
+	ctx = ext_environment_interpreter_context_get(this_ext, interp);
+
+	for (i = 0; i < core_env_items_count; i++)
+		sieve_environment_item_insert(ctx, core_env_items[i]);
+
+	ctx->active = TRUE;
+}
+
+bool sieve_ext_environment_is_active(const struct sieve_extension *env_ext,
+				     struct sieve_interpreter *interp)
+{
+	struct ext_environment_interpreter_context *ctx =
+		ext_environment_interpreter_context_get(env_ext, interp);
+
+	return (ctx != NULL && ctx->active);
+}
+
+/*
+ * Registration
+ */
+
+static void
+sieve_environment_item_insert(struct ext_environment_interpreter_context *ctx,
+			      const struct sieve_environment_item *item)
+{
+	if (!item->prefix)
+		hash_table_insert(ctx->name_items, item->name, item);
+	else
+		array_append(&ctx->prefix_items, &item, 1);
+}
+
+void sieve_environment_item_register(const struct sieve_extension *env_ext,
+				     struct sieve_interpreter *interp,
+				     const struct sieve_environment_item *item)
+{
+	struct ext_environment_interpreter_context *ctx;
+
+	i_assert(sieve_extension_is(env_ext, environment_extension));
+	ctx = ext_environment_interpreter_context_get(env_ext, interp);
+
+	sieve_environment_item_insert(ctx, item);
+}
+
+/*
+ * Retrieval
+ */
+
+static const struct sieve_environment_item *
+ext_environment_item_lookup(struct ext_environment_interpreter_context *ctx,
+			    const char **_name)
+{
+	const struct sieve_environment_item *item;
+	const char *name = *_name;
+
+	item = hash_table_lookup(ctx->name_items, name);
+	if (item != NULL)
+		return item;
+
+	array_foreach_elem(&ctx->prefix_items, item) {
+		size_t prefix_len;
+
+		i_assert(item->prefix);
+		prefix_len = strlen(item->name);
+
+		if (str_begins(name, item->name)) {
+			if (name[prefix_len] == '.') {
+				*_name = &name[prefix_len+1];
+				return item;
+			} else if (name[prefix_len] == '\0') {
+				*_name = &name[prefix_len+1];
+				return item;
+			}
+		}
+	}
+	return NULL;
+}
+
+const char *
+ext_environment_item_get_value(const struct sieve_extension *env_ext,
+			       const struct sieve_runtime_env *renv,
+			       const char *name)
+{
+	struct ext_environment_interpreter_context *ctx;
+	const struct sieve_environment_item *item;
+
+	i_assert(sieve_extension_is(env_ext, environment_extension));
+	ctx = ext_environment_interpreter_context_get(env_ext, renv->interp);
+
+	item = ext_environment_item_lookup(ctx, &name);
+	if (item == NULL)
+		return NULL;
+
+	if (item->value != NULL)
+		return item->value;
+	if (item->get_value != NULL)
+		return item->get_value(renv, name);
+	return NULL;
+}
+
+/*
+ * Default environment items
+ */
+
+/* "domain":
+
+     The primary DNS domain associated with the Sieve execution context, usually
+     but not always a proper suffix of the host name.
+ */
+
+static const char *
+envit_domain_get_value(const struct sieve_runtime_env *renv,
+		       const char *name ATTR_UNUSED)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+
+	return eenv->svinst->domainname;
+}
+
+const struct sieve_environment_item domain_env_item = {
+	.name = "domain",
+	.get_value = envit_domain_get_value,
+};
+
+/* "host":
+
+     The fully-qualified domain name of the host where the Sieve script is
+     executing.
+ */
+
+static const char *
+envit_host_get_value(const struct sieve_runtime_env *renv,
+		     const char *name ATTR_UNUSED)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+
+	return eenv->svinst->hostname;
+}
+
+const struct sieve_environment_item host_env_item = {
+	.name = "host",
+	.get_value = envit_host_get_value,
+};
+
+/* "location":
+
+     Sieve evaluation can be performed at various different points as messages
+     are processed. This item provides additional information about the type of
+     service that is evaluating the script.  Possible values are:
+      "MTA" - the Sieve script is being evaluated by a Message Transfer Agent
+      "MDA" - evaluation is being performed by a Mail Delivery Agent
+      "MUA" - evaluation is being performed by a Mail User Agent (right...)
+      "MS"  - evaluation is being performed by a Message Store
+ */
+
+static const char *
+envit_location_get_value(const struct sieve_runtime_env *renv,
+			 const char *name ATTR_UNUSED)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+
+	switch (eenv->svinst->env_location ) {
+	case SIEVE_ENV_LOCATION_MDA:
+		return "MDA";
+	case SIEVE_ENV_LOCATION_MTA:
+		return "MTA";
+	case SIEVE_ENV_LOCATION_MS:
+		return "MS";
+	default:
+		break;
+	}
+	return NULL;
+}
+
+const struct sieve_environment_item location_env_item = {
+	.name = "location",
+	.get_value = envit_location_get_value
+};
+
+/* "phase":
+
+     The point relative to final delivery where the Sieve script is being
+     evaluated.  Possible values are "pre", "during", and "post", referring
+     respectively to processing before, during, and after final delivery has
+     taken place.
+ */
+
+static const char *
+envit_phase_get_value(const struct sieve_runtime_env *renv,
+		      const char *name ATTR_UNUSED)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+
+	switch (eenv->svinst->delivery_phase) {
+	case SIEVE_DELIVERY_PHASE_PRE:
+		return "pre";
+	case SIEVE_DELIVERY_PHASE_DURING:
+		return "during";
+	case SIEVE_DELIVERY_PHASE_POST:
+		return "post";
+	default:
+		break;
+	}
+	return NULL;
+}
+
+const struct sieve_environment_item phase_env_item = {
+	.name = "phase",
+	.get_value = envit_phase_get_value
+};
+
+/* "name":
+
+    The product name associated with the Sieve interpreter.
+ */
+
+const struct sieve_environment_item name_env_item = {
+	.name = "name",
+	.value = PIGEONHOLE_NAME" Sieve"
+};
+
+/* "version":
+
+   The product version associated with the Sieve interpreter. The meaning of the
+   product version string is product-specific and should always be considered
+   in the context of the product name given by the "name" item.
+ */
+
+const struct sieve_environment_item version_env_item = {
+	.name = "version",
+	.value = PIGEONHOLE_VERSION,
+};
diff --git a/pigeonhole/src/lib-sieve/plugins/environment/ext-environment-common.h b/pigeonhole/src/lib-sieve/plugins/environment/ext-environment-common.h
new file mode 100644
index 0000000..288b82e
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/environment/ext-environment-common.h
@@ -0,0 +1,53 @@
+#ifndef EXT_ENVIRONMENT_COMMON_H
+#define EXT_ENVIRONMENT_COMMON_H
+
+#include "lib.h"
+
+#include "sieve-common.h"
+
+#include "sieve-ext-environment.h"
+
+/*
+ * Extension
+ */
+
+extern const struct sieve_extension_def environment_extension;
+
+/*
+ * Commands
+ */
+
+extern const struct sieve_command_def tst_environment;
+
+/*
+ * Operations
+ */
+
+extern const struct sieve_operation_def tst_environment_operation;
+
+/*
+ * Environment items
+ */
+
+extern const struct sieve_environment_item domain_env_item;
+extern const struct sieve_environment_item host_env_item;
+extern const struct sieve_environment_item location_env_item;
+extern const struct sieve_environment_item phase_env_item;
+extern const struct sieve_environment_item name_env_item;
+extern const struct sieve_environment_item version_env_item;
+
+/*
+ * Initialization
+ */
+
+bool ext_environment_init(const struct sieve_extension *ext, void **context);
+void ext_environment_deinit(const struct sieve_extension *ext);
+
+/*
+ * Validator context
+ */
+
+void ext_environment_interpreter_init(const struct sieve_extension *this_ext,
+				      struct sieve_interpreter *interp);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/environment/ext-environment.c b/pigeonhole/src/lib-sieve/plugins/environment/ext-environment.c
new file mode 100644
index 0000000..c2130a2
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/environment/ext-environment.c
@@ -0,0 +1,59 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension variables
+ * -------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 5183
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "unichar.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-binary.h"
+#include "sieve-interpreter.h"
+
+#include "sieve-validator.h"
+
+#include "ext-environment-common.h"
+
+/*
+ * Extension
+ */
+
+static bool ext_environment_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+static bool ext_environment_interpreter_load
+(const struct sieve_extension *ext,
+	const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_extension_def environment_extension = {
+	.name = "environment",
+	.validator_load = ext_environment_validator_load,
+	.interpreter_load = ext_environment_interpreter_load,
+	SIEVE_EXT_DEFINE_OPERATION(tst_environment_operation)
+};
+
+static bool ext_environment_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	sieve_validator_register_command(valdtr, ext, &tst_environment);
+	return TRUE;
+}
+
+static bool ext_environment_interpreter_load
+(const struct sieve_extension *ext,
+	const struct sieve_runtime_env *renv,
+	sieve_size_t *address ATTR_UNUSED)
+{
+	ext_environment_interpreter_init(ext, renv->interp);
+	return TRUE;
+}
+
diff --git a/pigeonhole/src/lib-sieve/plugins/environment/sieve-ext-environment.h b/pigeonhole/src/lib-sieve/plugins/environment/sieve-ext-environment.h
new file mode 100644
index 0000000..8ae0d18
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/environment/sieve-ext-environment.h
@@ -0,0 +1,54 @@
+#ifndef SIEVE_EXT_ENVIRONMENT_H
+#define SIEVE_EXT_ENVIRONMENT_H
+
+#include "sieve-common.h"
+
+/*
+ * Environment extension
+ */
+
+/* FIXME: this is not suitable for future plugin support */
+
+extern const struct sieve_extension_def environment_extension;
+
+static inline const struct sieve_extension *
+sieve_ext_environment_get_extension
+(struct sieve_instance *svinst)
+{
+	return sieve_extension_register
+		(svinst, &environment_extension, FALSE);
+}
+
+static inline const struct sieve_extension *
+sieve_ext_environment_require_extension
+(struct sieve_instance *svinst)
+{
+	return sieve_extension_require
+		(svinst, &environment_extension, TRUE);
+}
+
+bool sieve_ext_environment_is_active
+	(const struct sieve_extension *env_ext,
+		struct sieve_interpreter *interp);
+
+/*
+ * Environment item
+ */
+
+struct sieve_environment_item {
+	const char *name;
+	bool prefix;
+
+	const char *value;
+	const char *(*get_value)
+		(const struct sieve_runtime_env *renv, const char *name);
+};
+
+void sieve_environment_item_register
+	(const struct sieve_extension *env_ext, struct sieve_interpreter *interp,
+		const struct sieve_environment_item *item);
+const char *ext_environment_item_get_value
+	(const struct sieve_extension *env_ext,
+		const struct sieve_runtime_env *renv, const char *name);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/environment/tst-environment.c b/pigeonhole/src/lib-sieve/plugins/environment/tst-environment.c
new file mode 100644
index 0000000..9eaa099
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/environment/tst-environment.c
@@ -0,0 +1,215 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-match.h"
+
+#include "ext-environment-common.h"
+
+/*
+ * Environment test
+ *
+ * Syntax:
+ *   environment [COMPARATOR] [MATCH-TYPE]
+ *      <name: string> <key-list: string-list>
+ */
+
+static bool tst_environment_registered
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+static bool tst_environment_validate
+	(struct sieve_validator *valdtr, struct sieve_command *tst);
+static bool tst_environment_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd);
+
+const struct sieve_command_def tst_environment = {
+	.identifier = "environment",
+	.type = SCT_TEST,
+	.positional_args = 2,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = tst_environment_registered,
+	.validate = tst_environment_validate,
+	.generate = tst_environment_generate
+};
+
+/*
+ * Environment operation
+ */
+
+static bool tst_environment_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int tst_environment_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def tst_environment_operation = {
+	.mnemonic = "ENVIRONMENT",
+	.ext_def = &environment_extension,
+	.dump = tst_environment_operation_dump,
+	.execute = tst_environment_operation_execute
+};
+
+/*
+ * Test registration
+ */
+
+static bool tst_environment_registered
+(struct sieve_validator *valdtr, const struct sieve_extension *ext ATTR_UNUSED,
+	struct sieve_command_registration *cmd_reg)
+{
+	/* The order of these is not significant */
+	sieve_comparators_link_tag(valdtr, cmd_reg, SIEVE_MATCH_OPT_COMPARATOR);
+	sieve_match_types_link_tags(valdtr, cmd_reg, SIEVE_MATCH_OPT_MATCH_TYPE);
+
+	return TRUE;
+}
+
+/*
+ * Test validation
+ */
+
+static bool tst_environment_validate
+(struct sieve_validator *valdtr, struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+	const struct sieve_match_type mcht_default =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	const struct sieve_comparator cmp_default =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "name", 1, SAAT_STRING) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, tst, arg, FALSE) )
+		return FALSE;
+
+	arg = sieve_ast_argument_next(arg);
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "key list", 2, SAAT_STRING_LIST) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, tst, arg, FALSE) )
+		return FALSE;
+
+	/* Validate the key argument to a specified match type */
+	return sieve_match_type_validate
+		(valdtr, tst, arg, &mcht_default, &cmp_default);
+}
+
+/*
+ * Test generation
+ */
+
+static bool tst_environment_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &tst_environment_operation);
+
+ 	/* Generate arguments */
+	if ( !sieve_generate_arguments(cgenv, cmd, NULL) )
+		return FALSE;
+
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool tst_environment_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "ENVIRONMENT");
+	sieve_code_descend(denv);
+
+	/* Optional operands */
+	if ( sieve_match_opr_optional_dump(denv, address, NULL) != 0 )
+		return FALSE;
+
+	return
+		sieve_opr_string_dump(denv, address, "name") &&
+		sieve_opr_stringlist_dump(denv, address, "key list");
+}
+
+/*
+ * Code execution
+ */
+
+static int tst_environment_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	const struct sieve_extension *this_ext = renv->oprtn->ext;
+	struct sieve_match_type mcht =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	struct sieve_comparator cmp =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+	string_t *name;
+	struct sieve_stringlist *value_list, *key_list;
+	const char *env_item;
+	int match, ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Handle match-type and comparator operands */
+	if ( sieve_match_opr_optional_read
+		(renv, address, NULL, &ret, &cmp, &mcht) < 0 )
+		return ret;
+
+	/* Read source */
+	if ( (ret=sieve_opr_string_read(renv, address, "name", &name)) <= 0 )
+		return ret;
+
+	/* Read key-list */
+	if ( (ret=sieve_opr_stringlist_read(renv, address, "key-list", &key_list))
+		<= 0 )
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS, "environment test");
+
+	env_item = ext_environment_item_get_value
+		(this_ext, renv, str_c(name));
+
+	if ( env_item != NULL ) {
+		/* Construct value list */
+		value_list = sieve_single_stringlist_create_cstr(renv, env_item, FALSE);
+
+		/* Perform match */
+		if ( (match=sieve_match(renv, &mcht, &cmp, value_list, key_list, &ret))
+			< 0 )
+			return ret;
+	} else {
+		match = 0;
+
+		sieve_runtime_trace_descend(renv);
+		sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+			"environment item `%s' not found",
+			str_sanitize(str_c(name), 128));
+	}
+
+	/* Set test result for subsequent conditional jump */
+	sieve_interpreter_set_test_result(renv->interp, match > 0);
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/ihave/Makefile.am b/pigeonhole/src/lib-sieve/plugins/ihave/Makefile.am
new file mode 100644
index 0000000..1eb0472
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/ihave/Makefile.am
@@ -0,0 +1,22 @@
+noinst_LTLIBRARIES = libsieve_ext_ihave.la
+
+AM_CPPFLAGS = \
+	-I$(srcdir)/../.. \
+	$(LIBDOVECOT_INCLUDE)
+
+tests = \
+	tst-ihave.c
+
+commands = \
+	cmd-error.c
+
+libsieve_ext_ihave_la_SOURCES = \
+	$(tests) \
+	$(commands) \
+	ext-ihave-binary.c \
+	ext-ihave-common.c \
+	ext-ihave.c
+
+noinst_HEADERS = \
+	ext-ihave-binary.h \
+	ext-ihave-common.h
diff --git a/pigeonhole/src/lib-sieve/plugins/ihave/Makefile.in b/pigeonhole/src/lib-sieve/plugins/ihave/Makefile.in
new file mode 100644
index 0000000..c5b8952
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/ihave/Makefile.in
@@ -0,0 +1,707 @@
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+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
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+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
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+
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+
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+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/cmd-error.Plo
+	-rm -f ./$(DEPDIR)/ext-ihave-binary.Plo
+	-rm -f ./$(DEPDIR)/ext-ihave-common.Plo
+	-rm -f ./$(DEPDIR)/ext-ihave.Plo
+	-rm -f ./$(DEPDIR)/tst-ihave.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/ihave/cmd-error.c b/pigeonhole/src/lib-sieve/plugins/ihave/cmd-error.c
new file mode 100644
index 0000000..6e971bd
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/ihave/cmd-error.c
@@ -0,0 +1,131 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-binary.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "ext-ihave-common.h"
+
+/*
+ * Error command
+ *
+ * Syntax
+ *   error <message: string>
+ */
+
+static bool cmd_error_validate
+	(struct sieve_validator *valdtr, struct sieve_command *tst);
+static bool cmd_error_generate
+	(const struct sieve_codegen_env *cgenv,	struct sieve_command *ctx);
+
+const struct sieve_command_def error_command = {
+	.identifier = "error",
+	.type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = cmd_error_validate,
+	.generate = cmd_error_generate
+};
+
+/*
+ * Body operation
+ */
+
+static bool cmd_error_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int cmd_error_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def cmd_error_operation = {
+	.mnemonic = "ERROR",
+	.ext_def = &ihave_extension,
+	.code = EXT_IHAVE_OPERATION_ERROR,
+	.dump = cmd_error_operation_dump,
+	.execute = cmd_error_operation_execute
+};
+
+/*
+ * Validation
+ */
+
+static bool cmd_error_validate
+(struct sieve_validator *valdtr, struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "message", 1, SAAT_STRING) ) {
+		return FALSE;
+	}
+
+	return sieve_validator_argument_activate(valdtr, tst, arg, FALSE);
+}
+
+/*
+ * Code generation
+ */
+
+static bool cmd_error_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	(void)sieve_operation_emit(cgenv->sblock, cmd->ext, &cmd_error_operation);
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, cmd, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool cmd_error_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "ERROR");
+	sieve_code_descend(denv);
+
+	return sieve_opr_string_dump(denv, address, "message");
+}
+
+/*
+ * Interpretation
+ */
+
+static int cmd_error_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	string_t *message;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Read message */
+
+	if ( (ret=sieve_opr_string_read(renv, address, "message", &message)) <= 0 )
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS, "error \"%s\"",
+		str_sanitize(str_c(message), 80));
+
+	sieve_runtime_error(renv, NULL, "%s", str_c(message));
+
+	return SIEVE_EXEC_FAILURE;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/ihave/ext-ihave-binary.c b/pigeonhole/src/lib-sieve/plugins/ihave/ext-ihave-binary.c
new file mode 100644
index 0000000..01b375e
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/ihave/ext-ihave-binary.c
@@ -0,0 +1,249 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+
+#include "sieve-common.h"
+#include "sieve-extensions.h"
+#include "sieve-error.h"
+#include "sieve-script.h"
+#include "sieve-binary.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "ext-ihave-common.h"
+#include "ext-ihave-binary.h"
+
+/*
+ * Forward declarations
+ */
+
+static bool ext_ihave_binary_pre_save
+	(const struct sieve_extension *ext, struct sieve_binary *sbin,
+		void *context, enum sieve_error *error_r);
+static bool ext_ihave_binary_open
+	(const struct sieve_extension *ext, struct sieve_binary *sbin,
+		void *context);
+static bool ext_ihave_binary_up_to_date
+	(const struct sieve_extension *ext, struct sieve_binary *sbin,
+		void *context, enum sieve_compile_flags cpflags);
+
+/*
+ * Binary include extension
+ */
+
+const struct sieve_binary_extension ihave_binary_ext = {
+	.extension = &ihave_extension,
+	.binary_pre_save = ext_ihave_binary_pre_save,
+	.binary_open = ext_ihave_binary_open,
+	.binary_up_to_date = ext_ihave_binary_up_to_date
+};
+
+/*
+ * Binary context management
+ */
+
+struct ext_ihave_binary_context {
+	struct sieve_binary *binary;
+	struct sieve_binary_block *block;
+
+	ARRAY(const char *) missing_extensions;
+};
+
+static struct ext_ihave_binary_context *ext_ihave_binary_create_context
+(const struct sieve_extension *this_ext, struct sieve_binary *sbin)
+{
+	pool_t pool = sieve_binary_pool(sbin);
+
+	struct ext_ihave_binary_context *ctx =
+		p_new(pool, struct ext_ihave_binary_context, 1);
+
+	ctx->binary = sbin;
+	p_array_init(&ctx->missing_extensions, pool, 64);
+
+	sieve_binary_extension_set(sbin, this_ext, &ihave_binary_ext, ctx);
+	return ctx;
+}
+
+struct ext_ihave_binary_context *ext_ihave_binary_get_context
+(const struct sieve_extension *this_ext, struct sieve_binary *sbin)
+{
+	struct ext_ihave_binary_context *ctx = (struct ext_ihave_binary_context *)
+		sieve_binary_extension_get_context(sbin, this_ext);
+
+	if ( ctx == NULL )
+		ctx = ext_ihave_binary_create_context(this_ext, sbin);
+
+	return ctx;
+}
+
+struct ext_ihave_binary_context *ext_ihave_binary_init
+(const struct sieve_extension *this_ext, struct sieve_binary *sbin,
+	struct sieve_ast *ast)
+{
+	struct ext_ihave_ast_context *ast_ctx =
+		ext_ihave_get_ast_context(this_ext, ast);
+	struct ext_ihave_binary_context *binctx;
+	const char *const *exts;
+	unsigned int i, count;
+
+	binctx = ext_ihave_binary_get_context(this_ext, sbin);
+
+	exts = array_get(&ast_ctx->missing_extensions, &count);
+
+	if ( count > 0 ) {
+		pool_t pool = sieve_binary_pool(sbin);
+
+		if ( binctx->block == NULL )
+			binctx->block = sieve_binary_extension_create_block(sbin, this_ext);
+
+		for ( i = 0; i < count; i++ ) {
+			const char *ext_name = p_strdup(pool, exts[i]);
+
+			array_append(&binctx->missing_extensions, &ext_name, 1);
+		}
+	}
+
+	return binctx;
+}
+
+/*
+ * Binary extension
+ */
+
+static bool ext_ihave_binary_pre_save
+(const struct sieve_extension *ext, struct sieve_binary *sbin,
+	void *context, enum sieve_error *error_r ATTR_UNUSED)
+{
+	struct ext_ihave_binary_context *binctx =
+		(struct ext_ihave_binary_context *) context;
+	const char *const *exts;
+	unsigned int count, i;
+
+	exts = array_get(&binctx->missing_extensions, &count);
+
+	if ( binctx->block != NULL )
+		sieve_binary_block_clear(binctx->block);
+
+	if ( count > 0 ) {
+		if ( binctx->block == NULL )
+			binctx->block = sieve_binary_extension_create_block(sbin, ext);
+
+		sieve_binary_emit_unsigned(binctx->block, count);
+
+		for ( i = 0; i < count; i++ ) {
+			sieve_binary_emit_cstring(binctx->block, exts[i]);
+		}
+	}
+
+	return TRUE;
+}
+
+static bool ext_ihave_binary_open
+(const struct sieve_extension *ext, struct sieve_binary *sbin, void *context)
+{
+	struct sieve_instance *svinst = ext->svinst;
+	struct ext_ihave_binary_context *binctx =
+		(struct ext_ihave_binary_context *) context;
+	struct sieve_binary_block *sblock;
+	unsigned int i, count, block_id;
+	sieve_size_t offset;
+
+	sblock = sieve_binary_extension_get_block(sbin, ext);
+
+	if ( sblock != NULL ) {
+		binctx->block = sblock;
+		block_id = sieve_binary_block_get_id(sblock);
+
+		offset = 0;
+
+		/* Read number of missing extensions to read subsequently */
+		if ( !sieve_binary_read_unsigned(sblock, &offset, &count) ) {
+			e_error(svinst->event, "ihave: "
+				"failed to read missing extension count "
+				"from block %d of binary %s",
+				block_id, sieve_binary_path(sbin));
+			return FALSE;
+		}
+
+		/* Read dependencies */
+		for ( i = 0; i < count; i++ ) {
+			string_t *ext_name;
+			const char *name;
+
+			if ( !sieve_binary_read_string(sblock, &offset, &ext_name) ) {
+				/* Binary is corrupt, recompile */
+				e_error(svinst->event, "ihave: "
+					"failed to read missing extension name "
+					"from block %d of binary %s",
+					block_id, sieve_binary_path(sbin));
+				return FALSE;
+			}
+
+			name = str_c(ext_name);
+			array_append(&binctx->missing_extensions, &name, 1);
+		}
+	}
+
+	return TRUE;
+}
+
+static bool ext_ihave_binary_up_to_date
+(const struct sieve_extension *ext, struct sieve_binary *sbin ATTR_UNUSED,
+	void *context, enum sieve_compile_flags cpflags)
+{
+	struct ext_ihave_binary_context *binctx =
+		(struct ext_ihave_binary_context *) context;
+	const struct sieve_extension *mext;
+	const char *const *mexts;
+	unsigned int count, i;
+
+	mexts = array_get(&binctx->missing_extensions, &count);
+	for ( i = 0; i < count; i++ ) {
+		if ( (mext=sieve_extension_get_by_name(ext->svinst, mexts[i])) != NULL &&
+			((cpflags & SIEVE_COMPILE_FLAG_NOGLOBAL) == 0 || !mext->global) )
+			return FALSE;
+	}
+
+	return TRUE;
+}
+
+/*
+ * Main extension interface
+ */
+
+bool ext_ihave_binary_load
+(const struct sieve_extension *ext, struct sieve_binary *sbin)
+{
+	(void)ext_ihave_binary_get_context(ext, sbin);
+
+	return TRUE;
+}
+
+bool ext_ihave_binary_dump
+(const struct sieve_extension *ext, struct sieve_dumptime_env *denv)
+{
+	struct sieve_binary *sbin = denv->sbin;
+	struct ext_ihave_binary_context *binctx =
+		ext_ihave_binary_get_context(ext, sbin);
+	const char *const *exts;
+	unsigned int count, i;
+
+	exts = array_get(&binctx->missing_extensions, &count);
+
+	if ( count > 0 ) {
+		sieve_binary_dump_sectionf(denv,
+			"Extensions missing at compile (block: %d)",
+			sieve_binary_block_get_id(binctx->block));
+
+		for ( i = 0; i < count; i++ ) {
+			sieve_binary_dumpf(denv, "  -  %s\n", exts[i]);
+		}
+	}
+
+	return TRUE;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/ihave/ext-ihave-binary.h b/pigeonhole/src/lib-sieve/plugins/ihave/ext-ihave-binary.h
new file mode 100644
index 0000000..418f078
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/ihave/ext-ihave-binary.h
@@ -0,0 +1,33 @@
+#ifndef EXT_IHAVE_BINARY_H
+#define EXT_IHAVE_BINARY_H
+
+/*
+ * Binary context management
+ */
+
+struct ext_ihave_binary_context;
+
+struct ext_ihave_binary_context *ext_ihave_binary_get_context
+	(const struct sieve_extension *this_ext, struct sieve_binary *sbin);
+struct ext_ihave_binary_context *ext_ihave_binary_init
+	(const struct sieve_extension *this_ext, struct sieve_binary *sbin,
+		struct sieve_ast *ast);
+
+/*
+ * Registering missing extension
+ */
+
+void ext_ihave_binary_add_missing_extension
+	(struct ext_ihave_binary_context *binctx, const char *ext_name);
+
+/*
+ * Main extension interface
+ */
+
+bool ext_ihave_binary_load
+	(const struct sieve_extension *ext, struct sieve_binary *sbin);
+bool ext_ihave_binary_dump
+	(const struct sieve_extension *ext, struct sieve_dumptime_env *denv);
+
+#endif
+
diff --git a/pigeonhole/src/lib-sieve/plugins/ihave/ext-ihave-common.c b/pigeonhole/src/lib-sieve/plugins/ihave/ext-ihave-common.c
new file mode 100644
index 0000000..1d31238
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/ihave/ext-ihave-common.c
@@ -0,0 +1,52 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "array.h"
+
+#include "sieve-common.h"
+#include "sieve-ast.h"
+
+#include "ext-ihave-common.h"
+
+/*
+ * AST context management
+ */
+
+struct ext_ihave_ast_context *ext_ihave_get_ast_context
+(const struct sieve_extension *this_ext, struct sieve_ast *ast)
+{
+	struct ext_ihave_ast_context *actx = (struct ext_ihave_ast_context *)
+		sieve_ast_extension_get_context(ast, this_ext);
+	pool_t pool;
+
+	if ( actx != NULL )
+		return actx;
+
+	pool = sieve_ast_pool(ast);
+	actx = p_new(pool, struct ext_ihave_ast_context, 1);
+	p_array_init(&actx->missing_extensions, pool, 64);
+
+	sieve_ast_extension_set_context(ast, this_ext, (void *) actx);
+
+	return actx;
+}
+
+void ext_ihave_ast_add_missing_extension
+(const struct sieve_extension *this_ext, struct sieve_ast *ast,
+	const char *ext_name)
+{
+	struct ext_ihave_ast_context *actx =
+		ext_ihave_get_ast_context(this_ext, ast);
+	const char *const *exts;
+	unsigned int i, count;
+
+	exts = array_get(&actx->missing_extensions, &count);
+	for ( i = 0; i < count; i++ ) {
+		if ( strcmp(exts[i], ext_name) == 0 )
+			return;
+	}
+
+	array_append(&actx->missing_extensions, &ext_name, 1);
+}
+
diff --git a/pigeonhole/src/lib-sieve/plugins/ihave/ext-ihave-common.h b/pigeonhole/src/lib-sieve/plugins/ihave/ext-ihave-common.h
new file mode 100644
index 0000000..371d03d
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/ihave/ext-ihave-common.h
@@ -0,0 +1,52 @@
+#ifndef EXT_IHAVE_COMMON_H
+#define EXT_IHAVE_COMMON_H
+
+#include "sieve-common.h"
+
+/*
+ * Extensions
+ */
+
+extern const struct sieve_extension_def ihave_extension;
+
+/*
+ * Tests
+ */
+
+extern const struct sieve_command_def ihave_test;
+
+/*
+ * Commands
+ */
+
+extern const struct sieve_command_def error_command;
+
+/*
+ * Operations
+ */
+
+enum ext_ihave_opcode {
+	EXT_IHAVE_OPERATION_IHAVE,
+	EXT_IHAVE_OPERATION_ERROR
+};
+
+extern const struct sieve_operation_def tst_ihave_operation;
+extern const struct sieve_operation_def cmd_error_operation;
+
+/*
+ * AST context
+ */
+
+struct ext_ihave_ast_context {
+  ARRAY(const char *) missing_extensions;
+};
+
+struct ext_ihave_ast_context *ext_ihave_get_ast_context
+	(const struct sieve_extension *this_ext, struct sieve_ast *ast);
+
+void ext_ihave_ast_add_missing_extension
+	(const struct sieve_extension *this_ext, struct sieve_ast *ast,
+		const char *ext_name);
+
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/ihave/ext-ihave.c b/pigeonhole/src/lib-sieve/plugins/ihave/ext-ihave.c
new file mode 100644
index 0000000..40b70eb
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/ihave/ext-ihave.c
@@ -0,0 +1,70 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension ihave
+ * ---------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 5463
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "lib.h"
+
+#include "sieve-common.h"
+#include "sieve-extensions.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+
+#include "ext-ihave-common.h"
+#include "ext-ihave-binary.h"
+
+/*
+ * Operations
+ */
+
+const struct sieve_operation_def *ext_ihave_operations[] = {
+	&tst_ihave_operation,
+	&cmd_error_operation
+};
+
+/*
+ * Extension
+ */
+
+static bool ext_ihave_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *validator);
+static bool ext_ihave_generator_load
+	(const struct sieve_extension *ext, const struct sieve_codegen_env *cgenv);
+
+const struct sieve_extension_def ihave_extension = {
+	"ihave",
+	.version = 1,
+	.validator_load = ext_ihave_validator_load,
+	.generator_load = ext_ihave_generator_load,
+	.binary_load = ext_ihave_binary_load,
+	.binary_dump = ext_ihave_binary_dump,
+	SIEVE_EXT_DEFINE_OPERATIONS(ext_ihave_operations)
+};
+
+static bool ext_ihave_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *validator)
+{
+	sieve_validator_register_command(validator, ext, &ihave_test);
+	sieve_validator_register_command(validator, ext, &error_command);
+
+	return TRUE;
+}
+
+static bool ext_ihave_generator_load
+(const struct sieve_extension *ext, const struct sieve_codegen_env *cgenv)
+{
+	(void)ext_ihave_binary_init(ext, cgenv->sbin, cgenv->ast);
+
+	return TRUE;
+}
+
diff --git a/pigeonhole/src/lib-sieve/plugins/ihave/tst-ihave.c b/pigeonhole/src/lib-sieve/plugins/ihave/tst-ihave.c
new file mode 100644
index 0000000..c6c8e8f
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/ihave/tst-ihave.c
@@ -0,0 +1,294 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "array.h"
+
+#include "sieve-common.h"
+#include "sieve-stringlist.h"
+#include "sieve-extensions.h"
+#include "sieve-code.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+
+#include "ext-ihave-common.h"
+
+/*
+ * Ihave test
+ *
+ * Syntax:
+ *   ihave <capabilities: string-list>
+ */
+
+static bool
+tst_ihave_validate(struct sieve_validator *valdtr, struct sieve_command *tst);
+static bool
+tst_ihave_validate_const(struct sieve_validator *valdtr,
+			 struct sieve_command *tst, int *const_current,
+			 int const_next);
+static bool
+tst_ihave_generate(const struct sieve_codegen_env *cgenv,
+		   struct sieve_command *tst);
+
+const struct sieve_command_def ihave_test = {
+	.identifier = "ihave",
+	.type = SCT_TEST,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = tst_ihave_validate,
+	.validate_const = tst_ihave_validate_const,
+	.generate = tst_ihave_generate
+};
+
+/*
+ * Ihave operation
+ */
+
+static bool
+tst_ihave_operation_dump(const struct sieve_dumptime_env *denv,
+			 sieve_size_t *address);
+static int
+tst_ihave_operation_execute(const struct sieve_runtime_env *renv,
+			    sieve_size_t *address);
+
+const struct sieve_operation_def tst_ihave_operation = {
+	.mnemonic = "IHAVE",
+	.ext_def = &ihave_extension,
+	.code = EXT_IHAVE_OPERATION_IHAVE,
+	.dump = tst_ihave_operation_dump,
+	.execute = tst_ihave_operation_execute
+};
+
+/*
+ * Code validation
+ */
+
+static bool
+tst_ihave_validate(struct sieve_validator *valdtr, struct sieve_command *tst)
+{
+	struct _capability {
+		const struct sieve_extension *ext;
+		struct sieve_ast_argument *arg;
+	};
+	struct sieve_ast_argument *arg = tst->first_positional;
+	struct sieve_ast_argument *stritem;
+	enum sieve_compile_flags cpflags =
+		sieve_validator_compile_flags(valdtr);
+	bool no_global = ((cpflags & SIEVE_COMPILE_FLAG_NOGLOBAL) != 0);
+	ARRAY(struct _capability) capabilities;
+	struct _capability capability;
+	const struct _capability *caps;
+	unsigned int i, count;
+	bool all_known = TRUE;
+
+	t_array_init(&capabilities, 64);
+
+	tst->data = (void *)FALSE;
+
+	/* Check stringlist argument */
+	if (!sieve_validate_positional_argument(valdtr, tst, arg,
+						"capabilities", 1,
+						SAAT_STRING_LIST))
+		return FALSE;
+
+	switch (sieve_ast_argument_type(arg)) {
+	case SAAT_STRING:
+		/* Single string */
+		capability.arg = arg;
+		capability.ext = sieve_extension_get_by_name(
+			tst->ext->svinst, sieve_ast_argument_strc(arg));
+
+		if (capability.ext == NULL ||
+		    (no_global && capability.ext->global)) {
+			all_known = FALSE;
+
+			ext_ihave_ast_add_missing_extension(
+				tst->ext, tst->ast_node->ast,
+				sieve_ast_argument_strc(arg));
+		} else {
+			array_append(&capabilities, &capability, 1);
+		}
+
+		break;
+
+	case SAAT_STRING_LIST:
+		/* String list */
+		stritem = sieve_ast_strlist_first(arg);
+
+		while (stritem != NULL) {
+			capability.arg = stritem;
+			capability.ext = sieve_extension_get_by_name(
+				tst->ext->svinst,
+				sieve_ast_argument_strc(stritem));
+
+			if (capability.ext == NULL ||
+			    (no_global && capability.ext->global)) {
+				all_known = FALSE;
+
+				ext_ihave_ast_add_missing_extension(
+					tst->ext, tst->ast_node->ast,
+					sieve_ast_argument_strc(stritem));
+			} else {
+				array_append(&capabilities, &capability, 1);
+			}
+			stritem = sieve_ast_strlist_next(stritem);
+		}
+
+		break;
+	default:
+		i_unreached();
+	}
+
+	if (!all_known)
+		return TRUE;
+
+	/* RFC 5463, Section 4, page 4:
+
+	   The "ihave" extension is designed to be used with other extensions
+	   that add tests, actions, comparators, or arguments.  Implementations
+	   MUST NOT allow it to be used with extensions that change the
+	   underlying Sieve grammar, or extensions like encoded-character
+	   [RFC5228], or variables [RFC5229] that change how the content of
+	   Sieve scripts are interpreted.  The test MUST fail and the extension
+	   MUST NOT be enabled if such usage is attempted.
+	  
+	   FIXME: current implementation of this restriction is hardcoded and
+	   therefore highly inflexible
+	 */
+	caps = array_get(&capabilities, &count);
+	for (i = 0; i < count; i++) {
+		if (sieve_extension_name_is(caps[i].ext, "variables") ||
+		    sieve_extension_name_is(caps[i].ext, "encoded-character"))
+			return TRUE;
+	}
+
+	/* Load all extensions */
+	caps = array_get(&capabilities, &count);
+	for (i = 0; i < count; i++) {
+		if (!sieve_validator_extension_load(valdtr, tst, caps[i].arg,
+						    caps[i].ext, FALSE))
+			return FALSE;
+	}
+
+	if (!sieve_validator_argument_activate(valdtr, tst, arg, FALSE))
+		return FALSE;
+
+	tst->data = (void *)TRUE;
+	return TRUE;
+}
+
+static bool
+tst_ihave_validate_const(struct sieve_validator *valdtr ATTR_UNUSED,
+			 struct sieve_command *tst, int *const_current,
+			 int const_next ATTR_UNUSED)
+{
+	if ((bool)tst->data == TRUE)
+		*const_current = -1;
+	else
+		*const_current = 0;
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+bool tst_ihave_generate(const struct sieve_codegen_env *cgenv,
+			struct sieve_command *tst)
+{
+	/* Emit opcode */
+	sieve_operation_emit(cgenv->sblock, tst->ext, &tst_ihave_operation);
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, tst, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+tst_ihave_operation_dump(const struct sieve_dumptime_env *denv,
+			 sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "IHAVE");
+	sieve_code_descend(denv);
+
+	return sieve_opr_stringlist_dump(denv, address, "capabilities");
+}
+
+/*
+ * Code execution
+ */
+
+static int
+tst_ihave_operation_execute(const struct sieve_runtime_env *renv,
+			    sieve_size_t *address)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	struct sieve_instance *svinst = eenv->svinst;
+	struct sieve_stringlist *capabilities;
+	string_t *cap_item;
+	bool matched;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Read capabilities */
+	if ((ret = sieve_opr_stringlist_read(renv, address, "capabilities",
+					     &capabilities)) <= 0)
+		return ret;
+
+	/*
+	 * Perform test
+	 */
+
+	/* Perform the test */
+	sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS, "ihave test");
+	sieve_runtime_trace_descend(renv);
+
+	cap_item = NULL;
+	matched = TRUE;
+	while (matched &&
+	       (ret = sieve_stringlist_next_item(capabilities,
+						 &cap_item)) > 0) {
+		const struct sieve_extension *ext;
+		int sret;
+
+		ext = sieve_extension_get_by_name(svinst, str_c(cap_item));
+		if (ext == NULL) {
+			sieve_runtime_trace_error(
+				renv, "ihave: invalid extension name");
+			return SIEVE_EXEC_BIN_CORRUPT;
+		}
+		sret = sieve_interpreter_extension_start(renv->interp, ext);
+		if (sret == SIEVE_EXEC_FAILURE) {
+			sieve_runtime_trace(
+				renv, SIEVE_TRLVL_TESTS,
+				"extension `%s' not available",
+				sieve_extension_name(ext));
+			matched = FALSE;
+		} else if (sret == SIEVE_EXEC_OK) {
+			sieve_runtime_trace(
+				renv, SIEVE_TRLVL_TESTS,
+				"extension `%s' available",
+				sieve_extension_name(ext));
+		} else {
+			return sret;
+		}
+	}
+	if (ret < 0) {
+		sieve_runtime_trace_error(renv, "invalid capabilities item");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	/* Set test result for subsequent conditional jump */
+	sieve_interpreter_set_test_result(renv->interp, matched);
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/imap4flags/Makefile.am b/pigeonhole/src/lib-sieve/plugins/imap4flags/Makefile.am
new file mode 100644
index 0000000..e5390d4
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/imap4flags/Makefile.am
@@ -0,0 +1,33 @@
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+
+AM_CPPFLAGS = \
+	-I$(srcdir)/../.. \
+	-I$(srcdir)/../variables  \
+	$(LIBDOVECOT_INCLUDE)
+
+commands = \
+	cmd-flag.c
+
+tests = \
+	tst-hasflag.c
+
+tags = \
+	tag-flags.c
+
+libsieve_ext_imap4flags_la_SOURCES = \
+	ext-imap4flags-common.c \
+	$(commands) \
+	$(tests) \
+	$(tags) \
+	ext-imap4flags.c \
+	ext-imapflags.c
+
+public_headers = \
+	sieve-ext-imap4flags.h
+
+headers = \
+	ext-imap4flags-common.h
+
+pkginc_libdir=$(dovecot_pkgincludedir)/sieve
+pkginc_lib_HEADERS = $(public_headers)
+noinst_HEADERS = $(headers)
diff --git a/pigeonhole/src/lib-sieve/plugins/imap4flags/Makefile.in b/pigeonhole/src/lib-sieve/plugins/imap4flags/Makefile.in
new file mode 100644
index 0000000..77f2dc3
--- /dev/null
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+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/imap4flags/cmd-flag.c b/pigeonhole/src/lib-sieve/plugins/imap4flags/cmd-flag.c
new file mode 100644
index 0000000..2645669
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/imap4flags/cmd-flag.c
@@ -0,0 +1,251 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+
+#include "sieve-code.h"
+#include "sieve-stringlist.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "ext-imap4flags-common.h"
+
+/*
+ * Commands
+ */
+
+/* Forward declarations */
+
+static bool cmd_flag_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx);
+
+/* Setflag command
+ *
+ * Syntax:
+ *   setflag [<variablename: string>] <list-of-flags: string-list>
+ */
+
+const struct sieve_command_def cmd_setflag = {
+	.identifier = "setflag",
+	.type = SCT_COMMAND,
+	.positional_args = -1, /* We check positional arguments ourselves */
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = ext_imap4flags_command_validate,
+	.generate = cmd_flag_generate
+};
+
+/* Addflag command
+ *
+ * Syntax:
+ *   addflag [<variablename: string>] <list-of-flags: string-list>
+ */
+
+const struct sieve_command_def cmd_addflag = {
+	.identifier = "addflag",
+	.type = SCT_COMMAND,
+	.positional_args = -1, /* We check positional arguments ourselves */
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = ext_imap4flags_command_validate,
+	.generate = cmd_flag_generate
+};
+
+
+/* Removeflag command
+ *
+ * Syntax:
+ *   removeflag [<variablename: string>] <list-of-flags: string-list>
+ */
+
+const struct sieve_command_def cmd_removeflag = {
+	.identifier = "removeflag",
+	.type = SCT_COMMAND,
+	.positional_args = -1, /* We check positional arguments ourselves */
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = ext_imap4flags_command_validate,
+	.generate = cmd_flag_generate
+};
+
+/*
+ * Operations
+ */
+
+/* Forward declarations */
+
+bool cmd_flag_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int cmd_flag_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+/* Setflag operation */
+
+const struct sieve_operation_def setflag_operation = {
+	.mnemonic = "SETFLAG",
+	.ext_def = &imap4flags_extension,
+	.code = EXT_IMAP4FLAGS_OPERATION_SETFLAG,
+	.dump = cmd_flag_operation_dump,
+	.execute = cmd_flag_operation_execute
+};
+
+/* Addflag operation */
+
+const struct sieve_operation_def addflag_operation = {
+	.mnemonic = "ADDFLAG",
+	.ext_def = &imap4flags_extension,
+	.code = EXT_IMAP4FLAGS_OPERATION_ADDFLAG,
+	.dump = cmd_flag_operation_dump,
+	.execute = cmd_flag_operation_execute
+};
+
+/* Removeflag operation */
+
+const struct sieve_operation_def removeflag_operation = {
+	.mnemonic = "REMOVEFLAG",
+	.ext_def = &imap4flags_extension,
+	.code = EXT_IMAP4FLAGS_OPERATION_REMOVEFLAG,
+	.dump = cmd_flag_operation_dump,
+	.execute = cmd_flag_operation_execute
+};
+
+/*
+ * Code generation
+ */
+
+static bool cmd_flag_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg1, *arg2;
+
+	/* Emit operation */
+	if ( sieve_command_is(cmd, cmd_setflag) )
+		sieve_operation_emit(cgenv->sblock, cmd->ext, &setflag_operation);
+	else if ( sieve_command_is(cmd, cmd_addflag) )
+		sieve_operation_emit(cgenv->sblock, cmd->ext, &addflag_operation);
+	else if ( sieve_command_is(cmd, cmd_removeflag) )
+		sieve_operation_emit(cgenv->sblock, cmd->ext, &removeflag_operation);
+
+	arg1 = cmd->first_positional;
+	arg2 = sieve_ast_argument_next(arg1);
+
+	if ( arg2 == NULL ) {
+		/* No variable */
+		sieve_opr_omitted_emit(cgenv->sblock);
+		if ( !sieve_generate_argument(cgenv, arg1, cmd) )
+			return FALSE;
+	} else {
+		/* Full command */
+		if ( !sieve_generate_argument(cgenv, arg1, cmd) )
+			return FALSE;
+		if ( !sieve_generate_argument(cgenv, arg2, cmd) )
+			return FALSE;
+	}
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+bool cmd_flag_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	struct sieve_operand oprnd;
+
+	sieve_code_dumpf(denv, "%s", sieve_operation_mnemonic(denv->oprtn));
+	sieve_code_descend(denv);
+
+	sieve_code_mark(denv);
+	if ( !sieve_operand_read(denv->sblock, address, NULL, &oprnd) ) {
+		sieve_code_dumpf(denv, "ERROR: INVALID OPERAND");
+		return FALSE;
+	}
+
+	if ( !sieve_operand_is_omitted(&oprnd) ) {
+		return
+			sieve_opr_string_dump_data(denv, &oprnd, address, "variable name") &&
+			sieve_opr_stringlist_dump(denv, address, "list of flags");
+	}
+
+	return
+		sieve_opr_stringlist_dump(denv, address, "list of flags");
+}
+
+/*
+ * Code execution
+ */
+
+static int cmd_flag_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	const struct sieve_operation *op = renv->oprtn;
+	struct sieve_operand oprnd;
+	struct sieve_stringlist *flag_list;
+	struct sieve_variable_storage *storage;
+	unsigned int var_index;
+	ext_imapflag_flag_operation_t flag_op;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Read bare operand (two types possible) */
+	if ( (ret=sieve_operand_runtime_read
+		(renv, address, NULL, &oprnd)) <= 0 )
+		return ret;
+
+	/* Variable operand (optional) */
+	if ( !sieve_operand_is_omitted(&oprnd) ) {
+		/* Read the variable operand */
+		if ( (ret=sieve_variable_operand_read_data
+			(renv, &oprnd, address, "variable", &storage, &var_index)) <= 0 )
+			return ret;
+
+		/* Read flag list */
+		if ( (ret=sieve_opr_stringlist_read(renv, address, "flag-list", &flag_list))
+			<= 0 )
+			return ret;
+
+	/* Flag-list operand */
+	} else {
+		storage = NULL;
+		var_index = 0;
+
+		/* Read flag list */
+		if ( (ret=sieve_opr_stringlist_read(renv, address,
+			"flag-list", &flag_list)) <= 0 )
+			return ret;
+	}
+
+	/*
+	 * Perform operation
+	 */
+
+	/* Determine what to do */
+
+	if ( sieve_operation_is(op, setflag_operation) ) {
+		sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS, "setflag command");
+		flag_op = sieve_ext_imap4flags_set_flags;
+	} else if ( sieve_operation_is(op, addflag_operation) ) {
+		sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS, "addflag command");
+		flag_op = sieve_ext_imap4flags_add_flags;
+	} else if ( sieve_operation_is(op, removeflag_operation) ) {
+		sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS, "removeflag command");
+		flag_op = sieve_ext_imap4flags_remove_flags;
+	} else {
+		i_unreached();
+	}
+
+	sieve_runtime_trace_descend(renv);
+
+	/* Perform requested operation */
+	return flag_op(renv, op->ext, storage, var_index, flag_list);
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/imap4flags/ext-imap4flags-common.c b/pigeonhole/src/lib-sieve/plugins/imap4flags/ext-imap4flags-common.c
new file mode 100644
index 0000000..3c364b8
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/imap4flags/ext-imap4flags-common.c
@@ -0,0 +1,733 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "mail-storage.h"
+#include "imap-arg.h"
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-stringlist.h"
+#include "sieve-actions.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-result.h"
+#include "sieve-dump.h"
+
+#include "sieve-ext-variables.h"
+
+#include "ext-imap4flags-common.h"
+
+/*
+ * Tagged arguments
+ */
+
+extern const struct sieve_argument_def tag_flags;
+extern const struct sieve_argument_def tag_flags_implicit;
+
+/*
+ * Common command functions
+ */
+
+bool ext_imap4flags_command_validate
+(struct sieve_validator *valdtr, struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg = cmd->first_positional;
+	struct sieve_ast_argument *arg2;
+	const struct sieve_extension *var_ext;
+
+	/* Check arguments */
+
+	if ( arg == NULL ) {
+		sieve_command_validate_error(valdtr, cmd,
+			"the %s %s expects at least one argument, but none was found",
+			sieve_command_identifier(cmd), sieve_command_type_name(cmd));
+		return FALSE;
+	}
+
+	if ( sieve_ast_argument_type(arg) != SAAT_STRING &&
+		sieve_ast_argument_type(arg) != SAAT_STRING_LIST )
+	{
+		sieve_argument_validate_error(valdtr, arg,
+			"the %s %s expects either a string (variable name) or "
+			"a string-list (list of flags) as first argument, but %s was found",
+			sieve_command_identifier(cmd), sieve_command_type_name(cmd),
+			sieve_ast_argument_name(arg));
+		return FALSE;
+	}
+
+	arg2 = sieve_ast_argument_next(arg);
+	if ( arg2 != NULL ) {
+		/* First, check syntax sanity */
+
+		if ( sieve_ast_argument_type(arg) != SAAT_STRING )
+		{
+			if ( sieve_command_is(cmd, tst_hasflag) ) {
+				if ( sieve_ast_argument_type(arg) != SAAT_STRING_LIST ) {
+					sieve_argument_validate_error(valdtr, arg,
+						"if a second argument is specified for the hasflag, the first "
+						"must be a string-list (variable-list), but %s was found",
+						sieve_ast_argument_name(arg));
+					return FALSE;
+				}
+			} else {
+				sieve_argument_validate_error(valdtr, arg,
+					"if a second argument is specified for the %s %s, the first "
+					"must be a string (variable name), but %s was found",
+					sieve_command_identifier(cmd), sieve_command_type_name(cmd),
+					sieve_ast_argument_name(arg));
+				return FALSE;
+			}
+		}
+
+		/* Then, check whether the second argument is permitted */
+
+		var_ext = sieve_ext_variables_get_extension(cmd->ext->svinst);
+
+		if ( var_ext == NULL || !sieve_ext_variables_is_active(var_ext, valdtr) )
+			{
+			sieve_argument_validate_error(valdtr,arg,
+				"the %s %s only allows for the specification of a "
+				"variable name when the variables extension is active",
+				sieve_command_identifier(cmd), sieve_command_type_name(cmd));
+			return FALSE;
+		}
+
+		if ( !sieve_variable_argument_activate(var_ext, var_ext,
+			valdtr, cmd, arg, !sieve_command_is(cmd, tst_hasflag) ) )
+			return FALSE;
+
+		if ( sieve_ast_argument_type(arg2) != SAAT_STRING &&
+			sieve_ast_argument_type(arg2) != SAAT_STRING_LIST )
+		{
+			sieve_argument_validate_error(valdtr, arg2,
+				"the %s %s expects a string list (list of flags) as "
+				"second argument when two arguments are specified, "
+				"but %s was found",
+				sieve_command_identifier(cmd), sieve_command_type_name(cmd),
+				sieve_ast_argument_name(arg2));
+			return FALSE;
+		}
+	} else
+		arg2 = arg;
+
+	if ( !sieve_validator_argument_activate(valdtr, cmd, arg2, FALSE) )
+		return FALSE;
+
+	if ( !sieve_command_is(cmd, tst_hasflag) &&
+		sieve_argument_is_string_literal(arg2) ) {
+		struct ext_imap4flags_iter fiter;
+		const char *flag;
+
+		/* Warn the user about validity of verifiable flags */
+		ext_imap4flags_iter_init(&fiter, sieve_ast_argument_str(arg));
+
+		while ( (flag=ext_imap4flags_iter_get_flag(&fiter)) != NULL ) {
+			if ( !sieve_ext_imap4flags_flag_is_valid(flag) ) {
+				sieve_argument_validate_warning(valdtr, arg,
+					"IMAP flag '%s' specified for the %s command is invalid "
+					"and will be ignored (only first invalid is reported)",
+					str_sanitize(flag, 64), sieve_command_identifier(cmd));
+				break;
+			}
+		}
+	}
+
+	return TRUE;
+}
+
+/*
+ * Flags tag registration
+ */
+
+void ext_imap4flags_attach_flags_tag
+(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+	const char *command)
+{
+	/* Register :flags tag with the command and we don't care whether it is
+	 * registered or even whether it will be registered at all. The validator
+	 * handles either situation gracefully
+	 */
+
+	/* Tag specified by user */
+	sieve_validator_register_external_tag
+		(valdtr, command, ext, &tag_flags, SIEVE_OPT_SIDE_EFFECT);
+}
+
+void sieve_ext_imap4flags_register_side_effect
+(struct sieve_validator *valdtr, const struct sieve_extension *flg_ext,
+	const char *command)
+{
+	/* Implicit tag if none is specified */
+	sieve_validator_register_persistent_tag
+		(valdtr, command, flg_ext, &tag_flags_implicit);
+}
+
+
+/*
+ * Result context
+ */
+
+struct ext_imap4flags_result_context {
+    string_t *internal_flags;
+};
+
+static void _get_initial_flags
+(struct sieve_result *result, string_t *flags)
+{
+	const struct sieve_message_data *msgdata =
+		sieve_result_get_message_data(result);
+	enum mail_flags mail_flags;
+	const char *const *mail_keywords;
+
+	mail_flags = mail_get_flags(msgdata->mail);
+	mail_keywords = mail_get_keywords(msgdata->mail);
+
+	if ( (mail_flags & MAIL_FLAGGED) > 0 )
+		str_printfa(flags, " \\flagged");
+
+	if ( (mail_flags & MAIL_ANSWERED) > 0 )
+		str_printfa(flags, " \\answered");
+
+	if ( (mail_flags & MAIL_DELETED) > 0 )
+		str_printfa(flags, " \\deleted");
+
+	if ( (mail_flags & MAIL_SEEN) > 0 )
+		str_printfa(flags, " \\seen");
+
+	if ( (mail_flags & MAIL_DRAFT) > 0 )
+		str_printfa(flags, " \\draft");
+
+	while ( *mail_keywords != NULL ) {
+		str_printfa(flags, " %s", *mail_keywords);
+		mail_keywords++;
+	}
+}
+
+static inline struct ext_imap4flags_result_context *_get_result_context
+(const struct sieve_extension *this_ext, struct sieve_result *result)
+{
+	struct ext_imap4flags_result_context *rctx =
+		(struct ext_imap4flags_result_context *)
+		sieve_result_extension_get_context(result, this_ext);
+
+	if ( rctx == NULL ) {
+		pool_t pool = sieve_result_pool(result);
+
+		rctx =p_new(pool, struct ext_imap4flags_result_context, 1);
+		rctx->internal_flags = str_new(pool, 32);
+		_get_initial_flags(result, rctx->internal_flags);
+
+		sieve_result_extension_set_context
+			(result, this_ext, rctx);
+	}
+
+	return rctx;
+}
+
+static string_t *_get_flags_string
+(const struct sieve_extension *this_ext, struct sieve_result *result)
+{
+	struct ext_imap4flags_result_context *ctx =
+		_get_result_context(this_ext, result);
+
+	return ctx->internal_flags;
+}
+
+/*
+ * Runtime initialization
+ */
+
+static int ext_imap4flags_runtime_init
+(const struct sieve_extension *ext,
+	const struct sieve_runtime_env *renv,
+	void *context ATTR_UNUSED, bool deferred ATTR_UNUSED)
+{
+	sieve_result_add_implicit_side_effect
+		(renv->result, NULL, TRUE, ext, &flags_side_effect, NULL);
+	return SIEVE_EXEC_OK;
+}
+
+const struct sieve_interpreter_extension
+imap4flags_interpreter_extension = {
+	.ext_def = &imap4flags_extension,
+	.run = ext_imap4flags_runtime_init
+};
+
+/*
+ * Flag handling
+ */
+
+/* FIXME: This currently accepts a potentially unlimited number of
+ * flags, making the internal or variable flag list indefinitely long
+ */
+
+bool sieve_ext_imap4flags_flag_is_valid(const char *flag)
+{
+	if ( *flag == '\0' )
+		return FALSE;
+
+	if ( *flag == '\\' ) {
+		/* System flag */
+		const char *atom = t_str_ucase(flag);
+
+		if (
+			(strcmp(atom, "\\ANSWERED") != 0) &&
+			(strcmp(atom, "\\FLAGGED") != 0) &&
+			(strcmp(atom, "\\DELETED") != 0) &&
+			(strcmp(atom, "\\SEEN") != 0) &&
+			(strcmp(atom, "\\DRAFT") != 0) )
+		{
+			return FALSE;
+		}
+	} else {
+		const char *p;
+
+		/* Custom keyword:
+		 *
+		 * Syntax (IMAP4rev1, RFC 3501, Section 9. Formal Syntax) :
+		 *  flag-keyword    = atom
+		 *  atom            = 1*ATOM-CHAR
+		 */
+		p = flag;
+		while ( *p != '\0' ) {
+			if ( !IS_ATOM_CHAR(*p) )
+				return FALSE;
+			p++;
+		}
+	}
+
+	return TRUE;
+}
+
+/* Flag iterator */
+
+static void ext_imap4flags_iter_clear
+(struct ext_imap4flags_iter *iter)
+{
+	i_zero(iter);
+}
+
+void ext_imap4flags_iter_init
+(struct ext_imap4flags_iter *iter, string_t *flags_list)
+{
+	ext_imap4flags_iter_clear(iter);
+	iter->flags_list = flags_list;
+}
+
+static string_t *ext_imap4flags_iter_get_flag_str
+(struct ext_imap4flags_iter *iter)
+{
+	unsigned int len;
+	const unsigned char *fp;
+	const unsigned char *fbegin;
+	const unsigned char *fstart;
+	const unsigned char *fend;
+
+	/* Return if not initialized */
+	if ( iter->flags_list == NULL ) return NULL;
+
+	/* Return if no more flags are available */
+	len = str_len(iter->flags_list);
+	if ( iter->offset >= len ) return NULL;
+
+	/* Mark string boundries */
+	fbegin = str_data(iter->flags_list);
+	fend = fbegin + len;
+
+	/* Start of this flag */
+	fstart = fbegin + iter->offset;
+
+	/* Scan for next flag */
+	fp = fstart;
+	for (;;) {
+		/* Have we reached the end or a flag boundary? */
+		if ( fp >= fend || *fp == ' ' ) {
+			/* Did we scan more than nothing ? */
+			if ( fp > fstart ) {
+				/* Return flag */
+				string_t *flag = t_str_new(fp-fstart+1);
+				str_append_data(flag, fstart, fp-fstart);
+
+				iter->last = fstart - fbegin;
+				iter->offset = fp - fbegin;
+
+				return flag;
+			}
+
+			fstart = fp + 1;
+		}
+
+		if ( fp >= fend ) break;
+
+		fp++;
+	}
+
+	iter->last = fstart - fbegin;
+	iter->offset = fp - fbegin;
+	return NULL;
+}
+
+const char *ext_imap4flags_iter_get_flag
+(struct ext_imap4flags_iter *iter)
+{
+	string_t *flag = ext_imap4flags_iter_get_flag_str(iter);
+
+	if ( flag == NULL ) return NULL;
+
+	return str_c(flag);
+}
+
+static void ext_imap4flags_iter_delete_last
+(struct ext_imap4flags_iter *iter)
+{
+	iter->offset++;
+	if ( iter->offset > str_len(iter->flags_list) )
+		iter->offset = str_len(iter->flags_list);
+	if ( iter->offset == str_len(iter->flags_list) && iter->last > 0 )
+		iter->last--;
+
+	str_delete(iter->flags_list, iter->last, iter->offset - iter->last);
+
+	iter->offset = iter->last;
+}
+
+/* Flag operations */
+
+static string_t *ext_imap4flags_get_flag_variable
+(const struct sieve_runtime_env *renv,
+	const struct sieve_extension *flg_ext,
+	struct sieve_variable_storage *storage,
+	unsigned int var_index)
+	ATTR_NULL(2);
+
+static bool flags_list_flag_exists
+(string_t *flags_list, const char *flag)
+{
+	const char *flg;
+	struct ext_imap4flags_iter flit;
+
+	ext_imap4flags_iter_init(&flit, flags_list);
+
+	while ( (flg=ext_imap4flags_iter_get_flag(&flit)) != NULL ) {
+		if ( strcasecmp(flg, flag) == 0 )
+			return TRUE;
+	}
+
+	return FALSE;
+}
+
+static void flags_list_flag_delete
+(string_t *flags_list, const char *flag)
+{
+	const char *flg;
+	struct ext_imap4flags_iter flit;
+
+	ext_imap4flags_iter_init(&flit, flags_list);
+
+	while ( (flg=ext_imap4flags_iter_get_flag(&flit)) != NULL ) {
+		if ( strcasecmp(flg, flag) == 0 ) {
+			ext_imap4flags_iter_delete_last(&flit);
+		}
+	}
+}
+
+static void flags_list_add_flags
+(string_t *flags_list, string_t *flags)
+{
+	const char *flg;
+	struct ext_imap4flags_iter flit;
+
+	ext_imap4flags_iter_init(&flit, flags);
+
+	while ( (flg=ext_imap4flags_iter_get_flag(&flit)) != NULL ) {
+		if ( sieve_ext_imap4flags_flag_is_valid(flg) &&
+			!flags_list_flag_exists(flags_list, flg) ) {
+			if ( str_len(flags_list) != 0 )
+				str_append_c(flags_list, ' ');
+			str_append(flags_list, flg);
+		}
+	}
+}
+
+static void flags_list_remove_flags
+(string_t *flags_list, string_t *flags)
+{
+	const char *flg;
+	struct ext_imap4flags_iter flit;
+
+	ext_imap4flags_iter_init(&flit, flags);
+
+	while ( (flg=ext_imap4flags_iter_get_flag(&flit)) != NULL ) {
+		flags_list_flag_delete(flags_list, flg);
+	}
+}
+
+static void flags_list_set_flags
+(string_t *flags_list, string_t *flags)
+{
+	str_truncate(flags_list, 0);
+	flags_list_add_flags(flags_list, flags);
+}
+
+static void flags_list_clear_flags
+(string_t *flags_list)
+{
+	str_truncate(flags_list, 0);
+}
+
+static string_t *ext_imap4flags_get_flag_variable
+(const struct sieve_runtime_env *renv,
+	const struct sieve_extension *flg_ext,
+	struct sieve_variable_storage *storage,
+	unsigned int var_index)
+{
+	string_t *flags;
+
+	if ( storage != NULL ) {
+		if ( sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS) ) {
+			const char *var_name, *var_id;
+
+			(void)sieve_variable_get_identifier(storage, var_index, &var_name);
+			var_id = sieve_variable_get_varid(storage, var_index);
+
+			sieve_runtime_trace(renv, 0, "update variable `%s' [%s]",
+				var_name, var_id);
+		}
+
+		if ( !sieve_variable_get_modifiable(storage, var_index, &flags) )
+			return NULL;
+	} else {
+		i_assert( sieve_extension_is(flg_ext, imap4flags_extension) );
+		flags = _get_flags_string(flg_ext, renv->result);
+	}
+
+	return flags;
+}
+
+int sieve_ext_imap4flags_set_flags
+(const struct sieve_runtime_env *renv,
+	const struct sieve_extension *flg_ext,
+	struct sieve_variable_storage *storage,
+	unsigned int var_index,
+	struct sieve_stringlist *flags)
+{
+	string_t *cur_flags = ext_imap4flags_get_flag_variable
+		(renv, flg_ext, storage, var_index);
+
+	if ( cur_flags != NULL ) {
+		string_t *flags_item;
+		int ret;
+
+		flags_list_clear_flags(cur_flags);
+		while ( (ret=sieve_stringlist_next_item(flags, &flags_item)) > 0 ) {
+			sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS,
+				"set flags `%s'", str_c(flags_item));
+
+			flags_list_add_flags(cur_flags, flags_item);
+		}
+
+		if ( ret < 0 ) return SIEVE_EXEC_BIN_CORRUPT;
+
+		return SIEVE_EXEC_OK;
+	}
+
+	return SIEVE_EXEC_BIN_CORRUPT;
+}
+
+int sieve_ext_imap4flags_add_flags
+(const struct sieve_runtime_env *renv,
+	const struct sieve_extension *flg_ext,
+	struct sieve_variable_storage *storage,
+	unsigned int var_index,
+	struct sieve_stringlist *flags)
+{
+	string_t *cur_flags = ext_imap4flags_get_flag_variable
+		(renv, flg_ext, storage, var_index);
+
+	if ( cur_flags != NULL ) {
+		string_t *flags_item;
+		int ret;
+
+		while ( (ret=sieve_stringlist_next_item(flags, &flags_item)) > 0 ) {
+			sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS,
+				"add flags `%s'", str_c(flags_item));
+
+			flags_list_add_flags(cur_flags, flags_item);
+		}
+
+		if ( ret < 0 ) return SIEVE_EXEC_BIN_CORRUPT;
+
+		return SIEVE_EXEC_OK;
+	}
+
+	return SIEVE_EXEC_BIN_CORRUPT;
+}
+
+int sieve_ext_imap4flags_remove_flags
+(const struct sieve_runtime_env *renv,
+	const struct sieve_extension *flg_ext,
+	struct sieve_variable_storage *storage,
+	unsigned int var_index,
+	struct sieve_stringlist *flags)
+{
+	string_t *cur_flags = ext_imap4flags_get_flag_variable
+		(renv, flg_ext, storage, var_index);
+
+	if ( cur_flags != NULL ) {
+		string_t *flags_item;
+		int ret;
+
+		while ( (ret=sieve_stringlist_next_item(flags, &flags_item)) > 0 ) {
+			sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS,
+				"remove flags `%s'", str_c(flags_item));
+
+			flags_list_remove_flags(cur_flags, flags_item);
+		}
+
+		if ( ret < 0 ) return SIEVE_EXEC_BIN_CORRUPT;
+
+		return SIEVE_EXEC_OK;
+	}
+
+	return SIEVE_EXEC_BIN_CORRUPT;
+}
+
+/* Flag stringlist */
+
+static int ext_imap4flags_stringlist_next_item
+	(struct sieve_stringlist *_strlist, string_t **str_r);
+static void ext_imap4flags_stringlist_reset
+	(struct sieve_stringlist *_strlist);
+
+struct ext_imap4flags_stringlist {
+	struct sieve_stringlist strlist;
+
+	struct sieve_stringlist *flags_list;
+	string_t *flags_string;
+	struct ext_imap4flags_iter flit;
+
+	bool normalize:1;
+};
+
+static struct sieve_stringlist *ext_imap4flags_stringlist_create
+(const struct sieve_runtime_env *renv, struct sieve_stringlist *flags_list,
+	bool normalize)
+{
+	struct ext_imap4flags_stringlist *strlist;
+
+	strlist = t_new(struct ext_imap4flags_stringlist, 1);
+	strlist->strlist.exec_status = SIEVE_EXEC_OK;
+	strlist->strlist.runenv = renv;
+	strlist->strlist.next_item = ext_imap4flags_stringlist_next_item;
+	strlist->strlist.reset = ext_imap4flags_stringlist_reset;
+	strlist->normalize = normalize;
+
+	strlist->flags_list = flags_list;
+
+	return &strlist->strlist;
+}
+
+static struct sieve_stringlist *ext_imap4flags_stringlist_create_single
+(const struct sieve_runtime_env *renv, string_t *flags_string, bool normalize)
+{
+	struct ext_imap4flags_stringlist *strlist;
+
+	strlist = t_new(struct ext_imap4flags_stringlist, 1);
+	strlist->strlist.exec_status = SIEVE_EXEC_OK;
+	strlist->strlist.runenv = renv;
+	strlist->strlist.next_item = ext_imap4flags_stringlist_next_item;
+	strlist->strlist.reset = ext_imap4flags_stringlist_reset;
+	strlist->normalize = normalize;
+
+	if ( normalize ) {
+		strlist->flags_string = t_str_new(256);
+		flags_list_set_flags(strlist->flags_string, flags_string);
+	} else {
+		strlist->flags_string = flags_string;
+	}
+
+	ext_imap4flags_iter_init(&strlist->flit, strlist->flags_string);
+
+	return &strlist->strlist;
+}
+
+static int ext_imap4flags_stringlist_next_item
+(struct sieve_stringlist *_strlist, string_t **str_r)
+{
+	struct ext_imap4flags_stringlist *strlist =
+		(struct ext_imap4flags_stringlist *)_strlist;
+
+	while ( (*str_r=ext_imap4flags_iter_get_flag_str(&strlist->flit)) == NULL ) {
+		int ret;
+
+		if ( strlist->flags_list == NULL )
+			return 0;
+
+		if ( (ret=sieve_stringlist_next_item
+			(strlist->flags_list, &strlist->flags_string)) <= 0 )
+			return ret;
+
+		if ( strlist->flags_string == NULL )
+			return -1;
+
+		if ( strlist->normalize ) {
+			string_t *flags_string = t_str_new(256);
+
+			flags_list_set_flags(flags_string, strlist->flags_string);
+			strlist->flags_string = flags_string;
+		}
+
+		ext_imap4flags_iter_init(&strlist->flit, strlist->flags_string);
+	}
+
+	return 1;
+}
+
+static void ext_imap4flags_stringlist_reset
+(struct sieve_stringlist *_strlist)
+{
+	struct ext_imap4flags_stringlist *strlist =
+		(struct ext_imap4flags_stringlist *)_strlist;
+
+	if ( strlist->flags_list != NULL ) {
+		sieve_stringlist_reset(strlist->flags_list);
+		ext_imap4flags_iter_clear(&strlist->flit);
+	} else {
+		ext_imap4flags_iter_init(&strlist->flit, strlist->flags_string);
+	}
+}
+
+/* Flag access */
+
+struct sieve_stringlist *sieve_ext_imap4flags_get_flags
+(const struct sieve_runtime_env *renv,
+	const struct sieve_extension *flg_ext,
+	struct sieve_stringlist *flags_list)
+{
+	if ( flags_list == NULL ) {
+		i_assert( sieve_extension_is(flg_ext, imap4flags_extension) );
+		return ext_imap4flags_stringlist_create_single
+			(renv, _get_flags_string(flg_ext, renv->result), FALSE);
+	}
+
+	return ext_imap4flags_stringlist_create(renv, flags_list, TRUE);
+}
+
+void ext_imap4flags_get_implicit_flags_init
+(struct ext_imap4flags_iter *iter, const struct sieve_extension *this_ext,
+	struct sieve_result *result)
+{
+	string_t *cur_flags = _get_flags_string(this_ext, result);
+
+	ext_imap4flags_iter_init(iter, cur_flags);
+}
+
+
+
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/imap4flags/ext-imap4flags-common.h b/pigeonhole/src/lib-sieve/plugins/imap4flags/ext-imap4flags-common.h
new file mode 100644
index 0000000..4bedb85
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/imap4flags/ext-imap4flags-common.h
@@ -0,0 +1,97 @@
+#ifndef EXT_IMAP4FLAGS_COMMON_H
+#define EXT_IMAP4FLAGS_COMMON_H
+
+#include "lib.h"
+
+#include "sieve-common.h"
+#include "sieve-ext-variables.h"
+
+#include "sieve-ext-imap4flags.h"
+
+/*
+ * Side effect
+ */
+
+extern const struct sieve_side_effect_def flags_side_effect;
+
+/*
+ * Operands
+ */
+
+extern const struct sieve_operand_def flags_side_effect_operand;
+
+/*
+ * Operations
+ */
+
+enum ext_imap4flags_opcode {
+	EXT_IMAP4FLAGS_OPERATION_SETFLAG,
+	EXT_IMAP4FLAGS_OPERATION_ADDFLAG,
+	EXT_IMAP4FLAGS_OPERATION_REMOVEFLAG,
+	EXT_IMAP4FLAGS_OPERATION_HASFLAG
+};
+
+extern const struct sieve_operation_def setflag_operation;
+extern const struct sieve_operation_def addflag_operation;
+extern const struct sieve_operation_def removeflag_operation;
+extern const struct sieve_operation_def hasflag_operation;
+
+/*
+ * Commands
+ */
+
+extern const struct sieve_command_def cmd_setflag;
+extern const struct sieve_command_def cmd_addflag;
+extern const struct sieve_command_def cmd_removeflag;
+
+extern const struct sieve_command_def tst_hasflag;
+
+/*
+ * Common command functions
+ */
+
+bool ext_imap4flags_command_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+
+/*
+ * Flags tagged argument
+ */
+
+void ext_imap4flags_attach_flags_tag
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		const char *command);
+
+/*
+ * Flag management
+ */
+
+struct ext_imap4flags_iter {
+	string_t *flags_list;
+	unsigned int offset;
+	unsigned int last;
+};
+
+void ext_imap4flags_iter_init
+	(struct ext_imap4flags_iter *iter, string_t *flags_list);
+
+const char *ext_imap4flags_iter_get_flag
+	(struct ext_imap4flags_iter *iter);
+
+/* Flag operations */
+
+typedef int (*ext_imapflag_flag_operation_t)
+	(const struct sieve_runtime_env *renv,
+		const struct sieve_extension *flg_ext,
+		struct sieve_variable_storage *storage,
+		unsigned int var_index, struct sieve_stringlist *flags)
+		ATTR_NULL(2);
+
+/* Flags access */
+
+void ext_imap4flags_get_implicit_flags_init
+	(struct ext_imap4flags_iter *iter, const struct sieve_extension *this_ext,
+		struct sieve_result *result);
+
+
+#endif
+
diff --git a/pigeonhole/src/lib-sieve/plugins/imap4flags/ext-imap4flags.c b/pigeonhole/src/lib-sieve/plugins/imap4flags/ext-imap4flags.c
new file mode 100644
index 0000000..23230c1
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/imap4flags/ext-imap4flags.c
@@ -0,0 +1,96 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension imap4flags
+ * --------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 5232
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "lib.h"
+#include "mempool.h"
+#include "str.h"
+
+#include "sieve-common.h"
+
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-actions.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+
+#include "ext-imap4flags-common.h"
+
+/*
+ * Operations
+ */
+
+const struct sieve_operation_def *imap4flags_operations[] = {
+	&setflag_operation,
+	&addflag_operation,
+	&removeflag_operation,
+	&hasflag_operation
+};
+
+/*
+ * Extension
+ */
+
+static bool ext_imap4flags_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+static bool ext_imap4flags_interpreter_load
+	(const struct sieve_extension *ext, const struct sieve_runtime_env *renv,
+		sieve_size_t *address);
+
+const struct sieve_extension_def imap4flags_extension = {
+	.name = "imap4flags",
+	.version = 1,
+	.validator_load = ext_imap4flags_validator_load,
+	.interpreter_load = ext_imap4flags_interpreter_load,
+	SIEVE_EXT_DEFINE_OPERATIONS(imap4flags_operations),
+	SIEVE_EXT_DEFINE_OPERAND(flags_side_effect_operand)
+};
+
+static bool ext_imap4flags_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	/* Register commands */
+	sieve_validator_register_command(valdtr, ext, &cmd_setflag);
+	sieve_validator_register_command(valdtr, ext, &cmd_addflag);
+	sieve_validator_register_command(valdtr, ext, &cmd_removeflag);
+	sieve_validator_register_command(valdtr, ext, &tst_hasflag);
+
+	/* Attach :flags tag to keep and fileinto commands */
+	ext_imap4flags_attach_flags_tag(valdtr, ext, "keep");
+	ext_imap4flags_attach_flags_tag(valdtr, ext, "fileinto");
+
+	/* Attach flags side-effect to keep and fileinto actions */
+	sieve_ext_imap4flags_register_side_effect(valdtr, ext, "keep");
+	sieve_ext_imap4flags_register_side_effect(valdtr, ext, "fileinto");
+
+	return TRUE;
+}
+
+void sieve_ext_imap4flags_interpreter_load
+(const struct sieve_extension *ext, const struct sieve_runtime_env *renv)
+{
+	sieve_interpreter_extension_register
+		(renv->interp, ext, &imap4flags_interpreter_extension, NULL);
+}
+
+static bool ext_imap4flags_interpreter_load
+(const struct sieve_extension *ext, const struct sieve_runtime_env *renv,
+	sieve_size_t *address ATTR_UNUSED)
+{
+	sieve_ext_imap4flags_interpreter_load(ext, renv);
+	return TRUE;
+}
+
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/imap4flags/ext-imapflags.c b/pigeonhole/src/lib-sieve/plugins/imap4flags/ext-imapflags.c
new file mode 100644
index 0000000..ba99035
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/imap4flags/ext-imapflags.c
@@ -0,0 +1,213 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension imapflags
+ * --------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: draft-melnikov-sieve-imapflags-03.txt
+ * Implementation: full, but deprecated; provided for backwards compatibility
+ * Status: testing
+ *
+ */
+
+#include "lib.h"
+#include "mempool.h"
+#include "str.h"
+
+#include "sieve-common.h"
+
+#include "sieve-ast.h"
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-actions.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+
+#include "ext-imap4flags-common.h"
+
+/*
+ * Commands
+ */
+
+static bool cmd_mark_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+
+/* Mark command
+ *
+ * Syntax:
+ *   mark
+ */
+
+static const struct sieve_command_def cmd_mark = {
+	.identifier = "mark",
+	.type = SCT_COMMAND,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = cmd_mark_validate
+};
+
+/* Unmark command
+ *
+ * Syntax:
+ *   unmark
+ */
+static const struct sieve_command_def cmd_unmark = {
+	.identifier = "unmark",
+	.type = SCT_COMMAND,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = cmd_mark_validate
+};
+
+/*
+ * Extension
+ */
+
+static bool ext_imapflags_load
+	(const struct sieve_extension *ext, void **context);
+static bool ext_imapflags_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+static bool ext_imapflags_interpreter_load
+	(const struct sieve_extension *ext, const struct sieve_runtime_env *renv,
+		sieve_size_t *address);
+
+const struct sieve_extension_def imapflags_extension = {
+	.name = "imapflags",
+	.load = ext_imapflags_load,
+	.validator_load = ext_imapflags_validator_load,
+	.interpreter_load = ext_imapflags_interpreter_load
+};
+
+static bool ext_imapflags_load
+(const struct sieve_extension *ext, void **context)
+{
+	if ( *context == NULL ) {
+		/* Make sure real extension is registered, it is needed by the binary */
+		*context = (void *)
+			sieve_extension_require(ext->svinst, &imap4flags_extension, FALSE);
+	}
+
+	return TRUE;
+}
+
+/*
+ * Validator
+ */
+
+static bool ext_imapflags_validator_check_conflict
+	(const struct sieve_extension *ext,
+		struct sieve_validator *valdtr, void *context,
+		struct sieve_ast_argument *require_arg,
+		const struct sieve_extension *other_ext,
+		bool required);
+static bool ext_imapflags_validator_validate
+	(const struct sieve_extension *ext,
+		struct sieve_validator *valdtr, void *context,
+		struct sieve_ast_argument *require_arg,
+		bool required);
+
+const struct sieve_validator_extension
+imapflags_validator_extension = {
+	.ext = &imapflags_extension,
+	.check_conflict = ext_imapflags_validator_check_conflict,
+	.validate = ext_imapflags_validator_validate
+};
+
+static bool ext_imapflags_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	sieve_validator_extension_register
+		(valdtr, ext, &imapflags_validator_extension, NULL);
+
+	return TRUE;
+}
+
+static bool ext_imapflags_validator_check_conflict
+(const struct sieve_extension *ext,
+	struct sieve_validator *valdtr, void *context ATTR_UNUSED,
+	struct sieve_ast_argument *require_arg,
+	const struct sieve_extension *ext_other,
+	bool required ATTR_UNUSED)
+{
+	const struct sieve_extension *master_ext =
+		(const struct sieve_extension *) ext->context;
+
+	if ( ext_other == master_ext ) {
+		sieve_argument_validate_error(valdtr, require_arg,
+			"the (deprecated) imapflags extension cannot be used "
+			"together with the imap4flags extension");
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+static bool ext_imapflags_validator_validate
+(const struct sieve_extension *ext,
+	struct sieve_validator *valdtr, void *context ATTR_UNUSED,
+	struct sieve_ast_argument *require_arg ATTR_UNUSED,
+	bool required ATTR_UNUSED)
+{
+	const struct sieve_extension *master_ext =
+		(const struct sieve_extension *) ext->context;
+
+	/* No conflicts */
+
+	/* Register commands */
+	sieve_validator_register_command(valdtr, master_ext, &cmd_setflag);
+	sieve_validator_register_command(valdtr, master_ext, &cmd_addflag);
+	sieve_validator_register_command(valdtr, master_ext, &cmd_removeflag);
+
+	sieve_validator_register_command(valdtr, master_ext, &cmd_mark);
+	sieve_validator_register_command(valdtr, master_ext, &cmd_unmark);
+
+	/* Attach flags side-effect to keep and fileinto actions */
+	sieve_ext_imap4flags_register_side_effect(valdtr, master_ext, "keep");
+	sieve_ext_imap4flags_register_side_effect(valdtr, master_ext, "fileinto");
+
+	return TRUE;
+}
+
+/*
+ * Interpreter
+ */
+
+static bool ext_imapflags_interpreter_load
+(const struct sieve_extension *ext, const struct sieve_runtime_env *renv,
+	sieve_size_t *address ATTR_UNUSED)
+{
+	const struct sieve_extension *master_ext =
+		(const struct sieve_extension *) ext->context;
+
+	sieve_ext_imap4flags_interpreter_load(master_ext, renv);
+	return TRUE;
+}
+
+/*
+ * Command validation
+ */
+
+static bool cmd_mark_validate
+(struct sieve_validator *valdtr, struct sieve_command *cmd)
+{
+	if ( sieve_command_is(cmd, cmd_mark) )
+		cmd->def = &cmd_addflag;
+	else
+		cmd->def = &cmd_removeflag;
+
+	cmd->first_positional = sieve_ast_argument_cstring_create
+		(cmd->ast_node, "\\flagged", cmd->ast_node->source_line);
+
+	if ( !sieve_validator_argument_activate
+		(valdtr, cmd, cmd->first_positional, FALSE) )
+		return FALSE;
+
+	return TRUE;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/imap4flags/sieve-ext-imap4flags.h b/pigeonhole/src/lib-sieve/plugins/imap4flags/sieve-ext-imap4flags.h
new file mode 100644
index 0000000..b38a3c8
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/imap4flags/sieve-ext-imap4flags.h
@@ -0,0 +1,74 @@
+#ifndef SIEVE_EXT_IMAP4FLAGS_H
+#define SIEVE_EXT_IMAP4FLAGS_H
+
+struct sieve_variable_storage;
+
+/*
+ * Imap4flags extension
+ */
+
+/* FIXME: this is not suitable for future plugin support */
+
+extern const struct sieve_extension_def imap4flags_extension;
+extern const struct sieve_interpreter_extension
+	imap4flags_interpreter_extension;
+
+static inline const struct sieve_extension *
+sieve_ext_imap4flags_require_extension
+(struct sieve_instance *svinst)
+{
+	return sieve_extension_require
+		(svinst, &imap4flags_extension, TRUE);
+}
+
+void sieve_ext_imap4flags_interpreter_load
+(const struct sieve_extension *ext,
+	const struct sieve_runtime_env *renv);
+
+/*
+ * Action side-effect
+ */
+
+void sieve_ext_imap4flags_register_side_effect
+(struct sieve_validator *valdtr, const struct sieve_extension *flg_ext,
+        const char *command);
+
+/*
+ * Flag syntax
+ */
+
+bool sieve_ext_imap4flags_flag_is_valid(const char *flag);
+
+/*
+ * Flag manipulation
+ */
+
+int sieve_ext_imap4flags_set_flags
+(const struct sieve_runtime_env *renv,
+	const struct sieve_extension *flg_ext,
+	struct sieve_variable_storage *storage,
+	unsigned int var_index,
+	struct sieve_stringlist *flags) ATTR_NULL(3);
+int sieve_ext_imap4flags_add_flags
+(const struct sieve_runtime_env *renv,
+	const struct sieve_extension *flg_ext,
+	struct sieve_variable_storage *storage,
+	unsigned int var_index,
+	struct sieve_stringlist *flags) ATTR_NULL(3);
+int sieve_ext_imap4flags_remove_flags
+(const struct sieve_runtime_env *renv,
+	const struct sieve_extension *flg_ext,
+	struct sieve_variable_storage *storage,
+	unsigned int var_index,
+	struct sieve_stringlist *flags) ATTR_NULL(3);
+
+/*
+ * Flag retrieval
+ */
+
+struct sieve_stringlist *sieve_ext_imap4flags_get_flags
+(const struct sieve_runtime_env *renv,
+	const struct sieve_extension *flg_ext,
+	struct sieve_stringlist *flags_list);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/imap4flags/tag-flags.c b/pigeonhole/src/lib-sieve/plugins/imap4flags/tag-flags.c
new file mode 100644
index 0000000..331063d
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/imap4flags/tag-flags.c
@@ -0,0 +1,402 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+#include "array.h"
+#include "mail-storage.h"
+
+#include "sieve-code.h"
+#include "sieve-stringlist.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-result.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-actions.h"
+#include "sieve-dump.h"
+
+#include "ext-imap4flags-common.h"
+
+#include <ctype.h>
+
+/*
+ * Flags tagged argument
+ */
+
+static bool
+tag_flags_validate(struct sieve_validator *valdtr,
+		   struct sieve_ast_argument **arg, struct sieve_command *cmd);
+static bool
+tag_flags_validate_persistent(struct sieve_validator *valdtr,
+			      struct sieve_command *cmd,
+			      const struct sieve_extension *ext);
+static bool
+tag_flags_generate(const struct sieve_codegen_env *cgenv,
+		   struct sieve_ast_argument *arg, struct sieve_command *cmd);
+
+const struct sieve_argument_def tag_flags = {
+	.identifier = "flags",
+	.validate = tag_flags_validate,
+	.generate = tag_flags_generate,
+};
+
+const struct sieve_argument_def tag_flags_implicit = {
+	.identifier = "flags-implicit",
+	.validate_persistent = tag_flags_validate_persistent,
+	.generate = tag_flags_generate,
+};
+
+/*
+ * Side effect
+ */
+
+static bool
+seff_flags_dump_context(const struct sieve_side_effect *seffect,
+			const struct sieve_dumptime_env *denv,
+			sieve_size_t *address);
+static int
+seff_flags_read_context(const struct sieve_side_effect *seffect,
+			const struct sieve_runtime_env *renv,
+			sieve_size_t *address, void **context);
+
+static int
+seff_flags_merge(const struct sieve_runtime_env *renv,
+		 const struct sieve_action *action,
+		 const struct sieve_side_effect *old_seffect,
+		 const struct sieve_side_effect *new_seffect,
+		 void **old_context);
+
+static void
+seff_flags_print(const struct sieve_side_effect *seffect,
+		 const struct sieve_action *action,
+		 const struct sieve_result_print_env *rpenv, bool *keep);
+
+static int
+seff_flags_pre_execute(const struct sieve_side_effect *seffect,
+		       const struct sieve_action_exec_env *aenv,
+		       void *tr_context, void **se_tr_context);
+
+const struct sieve_side_effect_def flags_side_effect = {
+	SIEVE_OBJECT("flags", &flags_side_effect_operand, 0),
+	.to_action = &act_store,
+	.dump_context = seff_flags_dump_context,
+	.read_context = seff_flags_read_context,
+	.merge = seff_flags_merge,
+	.print = seff_flags_print,
+	.pre_execute = seff_flags_pre_execute,
+};
+
+/*
+ * Operand
+ */
+
+static const struct sieve_extension_objects ext_side_effects =
+	SIEVE_EXT_DEFINE_SIDE_EFFECT(flags_side_effect);
+
+const struct sieve_operand_def flags_side_effect_operand = {
+	.name = "flags operand",
+	.ext_def = &imap4flags_extension,
+	.class = &sieve_side_effect_operand_class,
+	.interface = &ext_side_effects,
+};
+
+/*
+ * Tag validation
+ */
+
+static bool
+tag_flags_validate_persistent(struct sieve_validator *valdtr ATTR_UNUSED,
+			      struct sieve_command *cmd,
+			      const struct sieve_extension *ext)
+{
+	if (sieve_command_find_argument(cmd, &tag_flags) == NULL)
+		sieve_command_add_dynamic_tag(cmd, ext, &tag_flags_implicit,
+					      -1);
+	return TRUE;
+}
+
+static bool
+tag_flags_validate(struct sieve_validator *valdtr,
+		   struct sieve_ast_argument **arg, struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+
+	/* Detach the tag itself */
+	*arg = sieve_ast_argument_next(*arg);
+
+	/* Check syntax:
+	 *   :flags <list-of-flags: string-list>
+	 */
+	if (!sieve_validate_tag_parameter(valdtr, cmd, tag, *arg, NULL, 0,
+					  SAAT_STRING_LIST, FALSE))
+		return FALSE;
+
+	tag->parameters = *arg;
+
+	/* Detach parameter */
+	*arg = sieve_ast_arguments_detach(*arg,1);
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool
+tag_flags_generate(const struct sieve_codegen_env *cgenv,
+		   struct sieve_ast_argument *arg, struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *param;
+
+	if (sieve_ast_argument_type(arg) != SAAT_TAG)
+		return FALSE;
+
+	sieve_opr_side_effect_emit(cgenv->sblock, arg->argument->ext,
+				   &flags_side_effect);
+
+	if (sieve_argument_is(arg, tag_flags)) {
+		/* Explicit :flags tag */
+		param = arg->parameters;
+
+		/* Call the generation function for the argument */
+		if (param->argument != NULL && param->argument->def != NULL &&
+		    param->argument->def->generate != NULL &&
+		    !param->argument->def->generate(cgenv, param, cmd))
+			return FALSE;
+	} else if (sieve_argument_is(arg, tag_flags_implicit)) {
+		/* Implicit flags */
+		sieve_opr_omitted_emit(cgenv->sblock);
+	} else {
+		/* Something else?! */
+		i_unreached();
+	}
+	return TRUE;
+}
+
+/*
+ * Side effect implementation
+ */
+
+/* Context data */
+
+struct seff_flags_context {
+	ARRAY(const char *) keywords;
+	enum mail_flags flags;
+};
+
+/* Context coding */
+
+static bool
+seff_flags_dump_context(const struct sieve_side_effect *seffect ATTR_UNUSED,
+			const struct sieve_dumptime_env *denv,
+			sieve_size_t *address)
+{
+	return sieve_opr_stringlist_dump_ex(denv, address, "flags", "INTERNAL");
+}
+
+static struct seff_flags_context *
+seff_flags_get_implicit_context(const struct sieve_extension *this_ext,
+				struct sieve_result *result)
+{
+	pool_t pool = sieve_result_pool(result);
+	struct seff_flags_context *ctx;
+	const char *flag;
+	struct ext_imap4flags_iter flit;
+
+	ctx = p_new(pool, struct seff_flags_context, 1);
+	p_array_init(&ctx->keywords, pool, 2);
+
+	T_BEGIN {
+		/* Unpack */
+		ext_imap4flags_get_implicit_flags_init(&flit, this_ext, result);
+		while ((flag = ext_imap4flags_iter_get_flag(&flit)) != NULL) {
+			if (flag != NULL && *flag != '\\') {
+				/* keyword */
+				const char *keyword = p_strdup(pool, flag);
+				array_append(&ctx->keywords, &keyword, 1);
+			} else {
+				/* system flag */
+				if (flag == NULL ||
+				    strcasecmp(flag, "\\flagged") == 0)
+					ctx->flags |= MAIL_FLAGGED;
+				else if (strcasecmp(flag, "\\answered") == 0)
+					ctx->flags |= MAIL_ANSWERED;
+				else if (strcasecmp(flag, "\\deleted") == 0)
+					ctx->flags |= MAIL_DELETED;
+				else if (strcasecmp(flag, "\\seen") == 0)
+					ctx->flags |= MAIL_SEEN;
+				else if (strcasecmp(flag, "\\draft") == 0)
+					ctx->flags |= MAIL_DRAFT;
+			}
+		}
+	} T_END;
+
+	return ctx;
+}
+
+static int
+seff_flags_do_read_context(const struct sieve_side_effect *seffect,
+			   const struct sieve_runtime_env *renv,
+			   sieve_size_t *address, void **se_context)
+{
+	pool_t pool = sieve_result_pool(renv->result);
+	struct seff_flags_context *ctx;
+	string_t *flags_item;
+	struct sieve_stringlist *flag_list = NULL;
+	int ret;
+
+	ret = sieve_opr_stringlist_read_ex(renv, address, "flags", TRUE,
+					   &flag_list);
+	if (ret <= 0)
+		return ret;
+
+	if (flag_list == NULL) {
+		/* Flag list is omitted, use current value of internal
+		 * variable to construct side effect context.
+		 */
+		*se_context = seff_flags_get_implicit_context(
+			SIEVE_OBJECT_EXTENSION(seffect), renv->result);
+		return SIEVE_EXEC_OK;
+	}
+
+	ctx = p_new(pool, struct seff_flags_context, 1);
+	p_array_init(&ctx->keywords, pool, 2);
+
+	/* Unpack */
+	flags_item = NULL;
+	while ((ret = sieve_stringlist_next_item(flag_list, &flags_item)) > 0) {
+		const char *flag;
+		struct ext_imap4flags_iter flit;
+
+		ext_imap4flags_iter_init(&flit, flags_item);
+
+		while ((flag = ext_imap4flags_iter_get_flag(&flit)) != NULL) {
+			if (flag != NULL && *flag != '\\') {
+				/* keyword */
+				const char *keyword = p_strdup(pool, flag);
+
+				/* FIXME: should check for duplicates (cannot
+				   trust variables) */
+				array_append(&ctx->keywords, &keyword, 1);
+			} else {
+				/* system flag */
+				if (flag == NULL ||
+				    strcasecmp(flag, "\\flagged") == 0)
+					ctx->flags |= MAIL_FLAGGED;
+				else if (strcasecmp(flag, "\\answered") == 0)
+					ctx->flags |= MAIL_ANSWERED;
+				else if (strcasecmp(flag, "\\deleted") == 0)
+					ctx->flags |= MAIL_DELETED;
+				else if (strcasecmp(flag, "\\seen") == 0)
+					ctx->flags |= MAIL_SEEN;
+				else if (strcasecmp(flag, "\\draft") == 0)
+					ctx->flags |= MAIL_DRAFT;
+			}
+		}
+	}
+
+	if (ret < 0)
+		return flag_list->exec_status;
+
+	*se_context = (void *)ctx;
+	return SIEVE_EXEC_OK;
+}
+
+static int
+seff_flags_read_context(const struct sieve_side_effect *seffect,
+			const struct sieve_runtime_env *renv,
+			sieve_size_t *address, void **se_context)
+{
+	int ret;
+
+	T_BEGIN {
+		ret = seff_flags_do_read_context(seffect, renv, address,
+						 se_context);
+	} T_END;
+
+	return ret;
+}
+
+/* Result verification */
+
+static int
+seff_flags_merge(const struct sieve_runtime_env *renv ATTR_UNUSED,
+		 const struct sieve_action *action ATTR_UNUSED,
+		 const struct sieve_side_effect *old_seffect ATTR_UNUSED,
+		 const struct sieve_side_effect *new_seffect,
+		 void **old_context)
+{
+	if (new_seffect != NULL)
+		*old_context = new_seffect->context;
+	return 1;
+}
+
+/* Result printing */
+
+static void
+seff_flags_print(const struct sieve_side_effect *seffect,
+		 const struct sieve_action *action ATTR_UNUSED,
+		 const struct sieve_result_print_env *rpenv,
+		 bool *keep ATTR_UNUSED)
+{
+	struct sieve_result *result = rpenv->result;
+	struct seff_flags_context *ctx =
+		(struct seff_flags_context *)seffect->context;
+	unsigned int i;
+
+	if (ctx == NULL) {
+		ctx = seff_flags_get_implicit_context(
+			SIEVE_OBJECT_EXTENSION(seffect), result);
+	}
+
+	if (ctx->flags != 0 || array_count(&ctx->keywords) > 0) {
+		T_BEGIN {
+			string_t *flags = t_str_new(128);
+
+			if ((ctx->flags & MAIL_FLAGGED) > 0)
+				str_printfa(flags, " \\flagged");
+			if ((ctx->flags & MAIL_ANSWERED) > 0)
+				str_printfa(flags, " \\answered");
+			if ((ctx->flags & MAIL_DELETED) > 0)
+				str_printfa(flags, " \\deleted");
+			if ((ctx->flags & MAIL_SEEN) > 0)
+				str_printfa(flags, " \\seen");
+			if ((ctx->flags & MAIL_DRAFT) > 0)
+				str_printfa(flags, " \\draft");
+
+			for (i = 0; i < array_count(&ctx->keywords); i++) {
+				const char *const *keyword =
+					array_idx(&ctx->keywords, i);
+				str_printfa(flags, " %s",
+					    str_sanitize(*keyword, 64));
+			}
+
+			sieve_result_seffect_printf(rpenv, "add IMAP flags:%s",
+						    str_c(flags));
+		} T_END;
+	}
+}
+
+/* Result execution */
+
+static int
+seff_flags_pre_execute(const struct sieve_side_effect *seffect,
+		       const struct sieve_action_exec_env *aenv,
+		       void *tr_context, void **se_tr_context ATTR_UNUSED)
+{
+	struct seff_flags_context *ctx = seffect->context;
+	const char *const *keywords;
+
+	if (ctx == NULL) {
+		ctx = seff_flags_get_implicit_context(
+			SIEVE_OBJECT_EXTENSION(seffect), aenv->result);
+	}
+
+	(void)array_append_space(&ctx->keywords);
+	keywords = array_idx(&ctx->keywords, 0);
+
+	sieve_act_store_add_flags(aenv, tr_context, keywords, ctx->flags);
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/imap4flags/tst-hasflag.c b/pigeonhole/src/lib-sieve/plugins/imap4flags/tst-hasflag.c
new file mode 100644
index 0000000..23f2acc
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/imap4flags/tst-hasflag.c
@@ -0,0 +1,248 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+
+#include "sieve-commands.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-match.h"
+
+#include "ext-imap4flags-common.h"
+
+/*
+ * Hasflag test
+ *
+ * Syntax:
+ *   hasflag [MATCH-TYPE] [COMPARATOR] [<variable-list: string-list>]
+ *       <list-of-flags: string-list>
+ */
+
+static bool tst_hasflag_registered
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+static bool tst_hasflag_validate
+	(struct sieve_validator *valdtr,	struct sieve_command *tst);
+static bool tst_hasflag_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd);
+
+const struct sieve_command_def tst_hasflag = {
+	.identifier = "hasflag",
+	.type = SCT_TEST,
+	.positional_args = -1, /* We check positional arguments ourselves */
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = tst_hasflag_registered,
+	.validate = tst_hasflag_validate,
+	.generate = tst_hasflag_generate
+};
+
+/*
+ * Hasflag operation
+ */
+
+static bool tst_hasflag_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int tst_hasflag_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def hasflag_operation = {
+	.mnemonic = "HASFLAG",
+	.ext_def = &imap4flags_extension,
+	.code = EXT_IMAP4FLAGS_OPERATION_HASFLAG,
+	.dump = tst_hasflag_operation_dump,
+	.execute = tst_hasflag_operation_execute
+};
+
+/*
+ * Optional arguments
+ */
+
+enum tst_hasflag_optional {
+	OPT_VARIABLES = SIEVE_MATCH_OPT_LAST,
+};
+
+/*
+ * Tag registration
+ */
+
+static bool tst_hasflag_registered
+(struct sieve_validator *valdtr, const struct sieve_extension *ext ATTR_UNUSED,
+	struct sieve_command_registration *cmd_reg)
+{
+	/* The order of these is not significant */
+	sieve_comparators_link_tag(valdtr, cmd_reg, SIEVE_MATCH_OPT_COMPARATOR);
+	sieve_match_types_link_tags(valdtr, cmd_reg, SIEVE_MATCH_OPT_MATCH_TYPE);
+
+	return TRUE;
+}
+
+/*
+ * Validation
+ */
+
+static bool tst_hasflag_validate
+(struct sieve_validator *valdtr,	struct sieve_command *tst)
+{
+	struct sieve_ast_argument *vars = tst->first_positional;
+	struct sieve_ast_argument *keys = sieve_ast_argument_next(vars);
+	const struct sieve_match_type mcht_default =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	const struct sieve_comparator cmp_default =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+
+	if ( !ext_imap4flags_command_validate(valdtr, tst) )
+		return FALSE;
+
+	if ( keys == NULL ) {
+		keys = vars;
+		vars = NULL;
+	} else {
+		vars->argument->id_code = OPT_VARIABLES;
+	}
+
+	/* Validate the key argument to a specified match type */
+	return sieve_match_type_validate
+		(valdtr, tst, keys, &mcht_default, &cmp_default);
+}
+
+/*
+ * Code generation
+ */
+
+static bool tst_hasflag_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &hasflag_operation);
+
+	/* Generate arguments */
+	if ( !sieve_generate_arguments(cgenv, cmd, NULL) )
+		return FALSE;
+
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool tst_hasflag_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	int opt_code = 0;
+
+	sieve_code_dumpf(denv, "HASFLAG");
+	sieve_code_descend(denv);
+
+	/* Optional operands */
+
+	for (;;) {
+		bool opok = TRUE;
+		int opt;
+
+		if ( (opt=sieve_match_opr_optional_dump(denv, address, &opt_code))
+			< 0 )
+			return FALSE;
+
+		if ( opt == 0 ) break;
+
+		switch ( opt_code ) {
+		case OPT_VARIABLES:
+			opok = sieve_opr_stringlist_dump(denv, address, "variables");
+			break;
+		default:
+			return FALSE;
+		}
+
+		if ( !opok ) return FALSE;
+	}
+
+	return
+		sieve_opr_stringlist_dump(denv, address, "list of flags");
+}
+
+/*
+ * Interpretation
+ */
+
+static int tst_hasflag_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	const struct sieve_operation *op = renv->oprtn;
+	int opt_code = 0;
+	struct sieve_comparator cmp =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+	struct sieve_match_type mcht =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	struct sieve_stringlist *flag_list, *variables_list, *value_list, *key_list;
+	int match, ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Optional operands */
+
+	variables_list = NULL;
+	for (;;) {
+		int opt;
+
+		if ( (opt=sieve_match_opr_optional_read
+			(renv, address, &opt_code, &ret, &cmp, &mcht)) < 0 )
+			return ret;
+
+		if ( opt == 0 ) break;
+
+		switch ( opt_code ) {
+		case OPT_VARIABLES:
+			ret = sieve_opr_stringlist_read
+				(renv, address, "variables-list", &variables_list);
+			break;
+		default:
+			sieve_runtime_trace_error(renv, "invalid optional operand");
+			ret = SIEVE_EXEC_BIN_CORRUPT;
+		}
+
+		if ( ret <= 0 ) return ret;
+	}
+
+	/* Fixed operands */
+
+	if ( (ret=sieve_opr_stringlist_read(renv, address, "flag-list", &flag_list))
+		<= 0 )
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS, "hasflag test");
+
+	value_list = sieve_ext_imap4flags_get_flags
+		(renv, op->ext, variables_list);
+
+	if ( sieve_match_type_is(&mcht, is_match_type) ||
+		sieve_match_type_is(&mcht, contains_match_type) ) {
+		key_list = sieve_ext_imap4flags_get_flags
+			(renv, op->ext, flag_list);
+	} else {
+		key_list = flag_list;
+	}
+
+	/* Perform match */
+	if ( (match=sieve_match(renv, &mcht, &cmp, value_list, key_list, &ret)) < 0 )
+		return ret;
+
+	/* Set test result for subsequent conditional jump */
+	sieve_interpreter_set_test_result(renv->interp, match > 0);
+	return SIEVE_EXEC_OK;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/include/Makefile.am b/pigeonhole/src/lib-sieve/plugins/include/Makefile.am
new file mode 100644
index 0000000..5ce1599
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/include/Makefile.am
@@ -0,0 +1,24 @@
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+
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+	cmd-return.c \
+	cmd-global.c
+
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+	$(cmds) \
+	ext-include-common.c \
+	ext-include-binary.c \
+	ext-include-variables.c \
+	ext-include.c
+
+noinst_HEADERS = \
+	ext-include-common.h \
+	ext-include-limits.h \
+	ext-include-binary.h \
+	ext-include-variables.h
diff --git a/pigeonhole/src/lib-sieve/plugins/include/Makefile.in b/pigeonhole/src/lib-sieve/plugins/include/Makefile.in
new file mode 100644
index 0000000..06f003f
--- /dev/null
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+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
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+
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+
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+	-test -z "$(noinst_LTLIBRARIES)" || rm -f $(noinst_LTLIBRARIES)
+	@list='$(noinst_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+libsieve_ext_include.la: $(libsieve_ext_include_la_OBJECTS) $(libsieve_ext_include_la_DEPENDENCIES) $(EXTRA_libsieve_ext_include_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(LINK)  $(libsieve_ext_include_la_OBJECTS) $(libsieve_ext_include_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/cmd-global.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/cmd-include.Plo@am__quote@ # am--include-marker
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+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-include.Plo@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
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+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
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+
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+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
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+
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+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
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+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
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+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
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+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
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+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
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+installcheck: installcheck-am
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+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
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+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
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+		-rm -f ./$(DEPDIR)/cmd-global.Plo
+	-rm -f ./$(DEPDIR)/cmd-include.Plo
+	-rm -f ./$(DEPDIR)/cmd-return.Plo
+	-rm -f ./$(DEPDIR)/ext-include-binary.Plo
+	-rm -f ./$(DEPDIR)/ext-include-common.Plo
+	-rm -f ./$(DEPDIR)/ext-include-variables.Plo
+	-rm -f ./$(DEPDIR)/ext-include.Plo
+	-rm -f Makefile
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+	distclean-tags
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+		-rm -f ./$(DEPDIR)/cmd-global.Plo
+	-rm -f ./$(DEPDIR)/cmd-include.Plo
+	-rm -f ./$(DEPDIR)/cmd-return.Plo
+	-rm -f ./$(DEPDIR)/ext-include-binary.Plo
+	-rm -f ./$(DEPDIR)/ext-include-common.Plo
+	-rm -f ./$(DEPDIR)/ext-include-variables.Plo
+	-rm -f ./$(DEPDIR)/ext-include.Plo
+	-rm -f Makefile
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+uninstall-am:
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+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
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+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/include/cmd-global.c b/pigeonhole/src/lib-sieve/plugins/include/cmd-global.c
new file mode 100644
index 0000000..0ef37eb
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/include/cmd-global.c
@@ -0,0 +1,329 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+
+#include "sieve-common.h"
+#include "sieve-code.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-binary.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "sieve-ext-variables.h"
+
+#include "ext-include-common.h"
+#include "ext-include-binary.h"
+#include "ext-include-variables.h"
+
+/*
+ * Commands
+ */
+
+static bool cmd_global_validate
+  (struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool cmd_global_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd);
+
+const struct sieve_command_def cmd_global = {
+  .identifier = "global",
+  .type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+  .validate = cmd_global_validate,
+  .generate = cmd_global_generate,
+};
+
+/* DEPRICATED:
+ */
+
+/* Import command
+ *
+ * Syntax
+ *   import
+ */
+const struct sieve_command_def cmd_import = {
+	.identifier = "import",
+	.type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = cmd_global_validate,
+	.generate = cmd_global_generate,
+};
+
+/* Export command
+ *
+ * Syntax
+ *   export
+ */
+const struct sieve_command_def cmd_export = {
+	.identifier = "export",
+	.type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = cmd_global_validate,
+	.generate = cmd_global_generate,
+};
+
+/*
+ * Operations
+ */
+
+static bool opc_global_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int opc_global_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+/* Global operation */
+
+const struct sieve_operation_def global_operation = {
+	.mnemonic = "GLOBAL",
+	.ext_def = &include_extension,
+	.code = EXT_INCLUDE_OPERATION_GLOBAL,
+	.dump = opc_global_dump,
+	.execute = opc_global_execute
+};
+
+/*
+ * Validation
+ */
+
+static inline struct sieve_argument *_create_variable_argument
+(struct sieve_command *cmd, struct sieve_variable *var)
+{
+	struct sieve_argument *argument = sieve_argument_create
+		(cmd->ast_node->ast, NULL, cmd->ext, 0);
+
+	argument->data = (void *) var;
+
+	return argument;
+}
+
+static bool cmd_global_validate
+(struct sieve_validator *valdtr, struct sieve_command *cmd)
+{
+	const struct sieve_extension *this_ext = cmd->ext;
+	struct sieve_ast_argument *arg = cmd->first_positional;
+	struct sieve_command *prev = sieve_command_prev(cmd);
+
+	/* DEPRECATED: Check valid command placement */
+	if ( !sieve_command_is(cmd, cmd_global) ) {
+		if ( !sieve_command_is_toplevel(cmd) ||
+			( !sieve_command_is_first(cmd) && prev != NULL &&
+				!sieve_command_is(prev, cmd_require) &&
+				!sieve_command_is(prev, cmd_import) &&
+				!sieve_command_is(prev, cmd_export) ) ) {
+			sieve_command_validate_error(valdtr, cmd,
+				"the DEPRECATED %s command can only be placed at top level "
+				"at the beginning of the file after any require or "
+				"import/export commands",
+				sieve_command_identifier(cmd));
+			return FALSE;
+		}
+	}
+
+	/* Check for use of variables extension */
+	if ( !ext_include_validator_have_variables(this_ext, valdtr) ) {
+		sieve_command_validate_error(valdtr, cmd,
+			"%s command requires that variables extension is active",
+			sieve_command_identifier(cmd));
+		return FALSE;
+	}
+
+	/* Register global variable */
+	if ( sieve_ast_argument_type(arg) == SAAT_STRING ) {
+		/* Single string */
+		const char *identifier = sieve_ast_argument_strc(arg);
+		struct sieve_variable *var;
+
+		if ( (var=ext_include_variable_import_global
+			(valdtr, cmd, identifier)) == NULL )
+			return FALSE;
+
+		arg->argument = _create_variable_argument(cmd, var);
+
+	} else if ( sieve_ast_argument_type(arg) == SAAT_STRING_LIST ) {
+		/* String list */
+		struct sieve_ast_argument *stritem = sieve_ast_strlist_first(arg);
+
+		while ( stritem != NULL ) {
+			const char *identifier = sieve_ast_argument_strc(stritem);
+			struct sieve_variable *var;
+
+			if ( (var=ext_include_variable_import_global
+				(valdtr, cmd, identifier)) == NULL )
+				return FALSE;
+
+			stritem->argument = _create_variable_argument(cmd, var);
+
+			stritem = sieve_ast_strlist_next(stritem);
+		}
+	} else {
+		/* Something else */
+		sieve_argument_validate_error(valdtr, arg,
+			"the %s command accepts a single string or string list argument, "
+			"but %s was found", sieve_command_identifier(cmd),
+			sieve_ast_argument_name(arg));
+		return FALSE;
+	}
+
+	/* Join global commands with predecessors if possible */
+	if ( sieve_commands_equal(prev, cmd) ) {
+		/* Join this command's string list with the previous one */
+		prev->first_positional = sieve_ast_stringlist_join
+			(prev->first_positional, cmd->first_positional);
+
+		if ( prev->first_positional == NULL ) {
+			/* Not going to happen unless MAXINT stringlist items are specified */
+			sieve_command_validate_error(valdtr, cmd,
+				"compiler reached AST limit (script too complex)");
+			return FALSE;
+		}
+
+		/* Detach this command node */
+		sieve_ast_node_detach(cmd->ast_node);
+	}
+
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool cmd_global_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg = cmd->first_positional;
+
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &global_operation);
+
+	if ( sieve_ast_argument_type(arg) == SAAT_STRING ) {
+		/* Single string */
+		struct sieve_variable *var = (struct sieve_variable *) arg->argument->data;
+
+		(void)sieve_binary_emit_unsigned(cgenv->sblock, 1);
+		(void)sieve_binary_emit_unsigned(cgenv->sblock, var->index);
+
+	} else if ( sieve_ast_argument_type(arg) == SAAT_STRING_LIST ) {
+		/* String list */
+		struct sieve_ast_argument *stritem = sieve_ast_strlist_first(arg);
+
+		(void)sieve_binary_emit_unsigned
+			(cgenv->sblock, sieve_ast_strlist_count(arg));
+
+		while ( stritem != NULL ) {
+			struct sieve_variable *var =
+				(struct sieve_variable *) stritem->argument->data;
+
+			(void)sieve_binary_emit_unsigned(cgenv->sblock, var->index);
+
+			stritem = sieve_ast_strlist_next(stritem);
+		}
+	} else {
+		i_unreached();
+	}
+
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool opc_global_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	const struct sieve_extension *this_ext = denv->oprtn->ext;
+	unsigned int count, i, var_count;
+	struct sieve_variable_scope_binary *global_vars;
+	struct sieve_variable_scope *global_scope;
+	struct sieve_variable * const *vars;
+
+	if ( !sieve_binary_read_unsigned(denv->sblock, address, &count) )
+		return FALSE;
+
+	sieve_code_dumpf(denv, "GLOBAL (count: %u):", count);
+
+	global_vars = ext_include_binary_get_global_scope(this_ext, denv->sbin);
+	global_scope = sieve_variable_scope_binary_get(global_vars);
+	vars = sieve_variable_scope_get_variables(global_scope, &var_count);
+
+	sieve_code_descend(denv);
+
+	for ( i = 0; i < count; i++ ) {
+		unsigned int index;
+
+		sieve_code_mark(denv);
+		if ( !sieve_binary_read_unsigned(denv->sblock, address, &index) ||
+			index >= var_count )
+			return FALSE;
+
+		sieve_code_dumpf(denv, "%d: VAR[%d]: '%s'", i, index, vars[index]->identifier);
+	}
+
+	return TRUE;
+}
+
+/*
+ * Execution
+ */
+
+static int opc_global_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	const struct sieve_extension *this_ext = renv->oprtn->ext;
+	struct sieve_variable_scope_binary *global_vars;
+	struct sieve_variable_scope *global_scope;
+	struct sieve_variable_storage *storage;
+	struct sieve_variable * const *vars;
+	unsigned int var_count, count, i;
+
+	if ( !sieve_binary_read_unsigned(renv->sblock, address, &count) ) {
+		sieve_runtime_trace_error(renv,
+			"global: count operand invalid");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	global_vars = ext_include_binary_get_global_scope(this_ext, renv->sbin);
+	global_scope = sieve_variable_scope_binary_get(global_vars);
+	vars = sieve_variable_scope_get_variables(global_scope, &var_count);
+	storage = ext_include_interpreter_get_global_variables
+		(this_ext, renv->interp);
+
+	for ( i = 0; i < count; i++ ) {
+		unsigned int index;
+
+		if ( !sieve_binary_read_unsigned(renv->sblock, address, &index) ) {
+			sieve_runtime_trace_error(renv,
+				"global: variable index operand invalid");
+			return SIEVE_EXEC_BIN_CORRUPT;
+		}
+
+		if ( index >= var_count ) {
+			sieve_runtime_trace_error(renv,
+				"global: variable index %u is invalid in global storage (> %u)",
+				index, var_count);
+			return SIEVE_EXEC_BIN_CORRUPT;
+		}
+
+		sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS,
+			"global: exporting variable '%s' [gvid: %u, vid: %u]",
+			vars[index]->identifier, i, index);
+
+		/* Make sure variable is initialized (export) */
+		(void)sieve_variable_get_modifiable(storage, index, NULL);
+	}
+
+	return SIEVE_EXEC_OK;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/include/cmd-include.c b/pigeonhole/src/lib-sieve/plugins/include/cmd-include.c
new file mode 100644
index 0000000..92aefb4
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/include/cmd-include.c
@@ -0,0 +1,406 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+
+#include "sieve-common.h"
+#include "sieve-script.h"
+#include "sieve-storage.h"
+#include "sieve-ast.h"
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-binary.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "ext-include-common.h"
+#include "ext-include-binary.h"
+
+/*
+ * Include command
+ *
+ * Syntax:
+ *   include [LOCATION] [":once"] [":optional"] <value: string>
+ *
+ * [LOCATION]:
+ *   ":personal" / ":global"
+ */
+
+static bool cmd_include_registered
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+static bool cmd_include_pre_validate
+	(struct sieve_validator *valdtr ATTR_UNUSED, struct sieve_command *cmd);
+static bool cmd_include_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool cmd_include_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx);
+
+const struct sieve_command_def cmd_include = {
+	.identifier = "include",
+	.type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = cmd_include_registered,
+	.pre_validate = cmd_include_pre_validate,
+	.validate = cmd_include_validate,
+	.generate = cmd_include_generate
+};
+
+/*
+ * Include operation
+ */
+
+static bool opc_include_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int opc_include_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def include_operation = {
+	.mnemonic = "include",
+	.ext_def = &include_extension,
+	.code = EXT_INCLUDE_OPERATION_INCLUDE,
+	.dump = opc_include_dump,
+	.execute = opc_include_execute
+};
+
+/*
+ * Context structures
+ */
+
+struct cmd_include_context_data {
+	enum ext_include_script_location location;
+
+	struct sieve_script *script;
+	enum ext_include_flags flags;
+
+	bool location_assigned:1;
+};
+
+/*
+ * Tagged arguments
+ */
+
+static bool cmd_include_validate_location_tag
+	(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *cmd);
+
+static const struct sieve_argument_def include_personal_tag = {
+	.identifier = "personal",
+	.validate = cmd_include_validate_location_tag	
+};
+
+static const struct sieve_argument_def include_global_tag = {
+	.identifier = "global",
+	.validate = cmd_include_validate_location_tag
+};
+
+static bool cmd_include_validate_boolean_tag
+	(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *cmd);
+
+static const struct sieve_argument_def include_once_tag = {
+	.identifier = "once",
+	.validate = cmd_include_validate_boolean_tag
+};
+
+static const struct sieve_argument_def include_optional_tag = {
+	.identifier = "optional",
+	.validate = cmd_include_validate_boolean_tag
+};
+
+/*
+ * Tag validation
+ */
+
+static bool cmd_include_validate_location_tag
+(struct sieve_validator *valdtr,	struct sieve_ast_argument **arg,
+	struct sieve_command *cmd)
+{
+	struct cmd_include_context_data *ctx_data =
+		(struct cmd_include_context_data *) cmd->data;
+
+	if ( ctx_data->location_assigned) {
+		sieve_argument_validate_error(valdtr, *arg,
+			"include: cannot use location tags ':personal' and ':global' "
+			"multiple times");
+		return FALSE;
+	}
+
+	if ( sieve_argument_is(*arg, include_personal_tag) )
+		ctx_data->location = EXT_INCLUDE_LOCATION_PERSONAL;
+	else if ( sieve_argument_is(*arg, include_global_tag) )
+		ctx_data->location = EXT_INCLUDE_LOCATION_GLOBAL;
+	else
+		return FALSE;
+
+	ctx_data->location_assigned = TRUE;
+
+	/* Delete this tag (for now) */
+	*arg = sieve_ast_arguments_detach(*arg, 1);
+
+	return TRUE;
+}
+
+static bool cmd_include_validate_boolean_tag
+(struct sieve_validator *valdtr ATTR_UNUSED, struct sieve_ast_argument **arg,
+	struct sieve_command *cmd)
+{
+	struct cmd_include_context_data *ctx_data =
+		(struct cmd_include_context_data *) cmd->data;
+
+	if ( sieve_argument_is(*arg, include_once_tag) )
+		ctx_data->flags |= EXT_INCLUDE_FLAG_ONCE;
+	else
+		ctx_data->flags |= EXT_INCLUDE_FLAG_OPTIONAL;
+
+	/* Delete this tag (for now) */
+	*arg = sieve_ast_arguments_detach(*arg, 1);
+
+	return TRUE;
+}
+
+/*
+ * Command registration
+ */
+
+static bool cmd_include_registered
+(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+	struct sieve_command_registration *cmd_reg)
+{
+	sieve_validator_register_tag(valdtr, cmd_reg, ext, &include_personal_tag, 0);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext, &include_global_tag, 0);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext, &include_once_tag, 0);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext, &include_optional_tag, 0);
+
+	return TRUE;
+}
+
+/*
+ * Command validation
+ */
+
+static bool cmd_include_pre_validate
+(struct sieve_validator *valdtr ATTR_UNUSED, struct sieve_command *cmd)
+{
+	struct cmd_include_context_data *ctx_data;
+
+	/* Assign context */
+	ctx_data = p_new(sieve_command_pool(cmd), struct cmd_include_context_data, 1);
+	ctx_data->location = EXT_INCLUDE_LOCATION_PERSONAL;
+	cmd->data = ctx_data;
+
+	return TRUE;
+}
+
+static bool cmd_include_validate
+(struct sieve_validator *valdtr, struct sieve_command *cmd)
+{
+	const struct sieve_extension *this_ext = cmd->ext;
+	struct sieve_ast_argument *arg = cmd->first_positional;
+	struct cmd_include_context_data *ctx_data =
+		(struct cmd_include_context_data *) cmd->data;
+	struct sieve_storage *storage;
+	struct sieve_script *script;
+	const char *script_name;
+	enum sieve_error error = SIEVE_ERROR_NONE;
+	int ret;
+
+	/* Check argument */
+	if ( !sieve_validate_positional_argument
+		(valdtr, cmd, arg, "value", 1, SAAT_STRING) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, cmd, arg, FALSE) )
+		return FALSE;
+
+	/*
+	 * Variables are not allowed.
+	 */
+	if ( !sieve_argument_is_string_literal(arg) ) {
+		sieve_argument_validate_error(valdtr, arg,
+			"the include command requires a constant string for its value argument");
+		return FALSE;
+	}
+
+	/* Find the script */
+
+	script_name = sieve_ast_argument_strc(arg);
+
+	if ( !sieve_script_name_is_valid(script_name) ) {
+ 		sieve_argument_validate_error(valdtr, arg,
+			"include: invalid script name '%s'",
+			str_sanitize(script_name, 80));
+		return FALSE;
+	}
+
+	storage = ext_include_get_script_storage
+		(this_ext, ctx_data->location, script_name,	&error);
+	if ( storage == NULL ) {
+		// FIXME: handle ':optional' in this case
+		if (error == SIEVE_ERROR_NOT_FOUND) {
+			sieve_argument_validate_error(valdtr, arg,
+				"include: %s location for included script `%s' is unavailable "
+				"(contact system administrator for more information)",
+				ext_include_script_location_name(ctx_data->location),
+				str_sanitize(script_name, 80));
+		} else {
+			sieve_argument_validate_error(valdtr, arg,
+				"include: failed to access %s location for included script `%s' "
+				"(contact system administrator for more information)",
+				ext_include_script_location_name(ctx_data->location),
+				str_sanitize(script_name, 80));
+		}
+		return FALSE;
+	}
+
+	/* Create script object */
+	script = sieve_storage_get_script
+		(storage, script_name, &error);
+	if ( script == NULL )
+		return FALSE;
+
+	ret = sieve_script_open(script, &error);
+	if ( ret < 0 ) {
+		if ( error != SIEVE_ERROR_NOT_FOUND ) {
+			sieve_argument_validate_error(valdtr, arg,
+				"failed to access included %s script '%s': %s",
+				ext_include_script_location_name(ctx_data->location),
+				str_sanitize(script_name, 80),
+				sieve_script_get_last_error_lcase(script));
+			sieve_script_unref(&script);
+			return FALSE;
+
+		/* Not found */
+		} else {
+			enum sieve_compile_flags cpflags =
+				sieve_validator_compile_flags(valdtr);
+
+			if ( (ctx_data->flags & EXT_INCLUDE_FLAG_OPTIONAL) != 0 ) {
+				/* :optional */
+
+			} else if ( (cpflags & SIEVE_COMPILE_FLAG_UPLOADED) != 0 ) {
+				/* Script is being uploaded */
+				sieve_argument_validate_warning(valdtr, arg,
+					"included %s script '%s' does not exist (ignored during upload)",
+					ext_include_script_location_name(ctx_data->location),
+					str_sanitize(script_name, 80));
+				ctx_data->flags |= EXT_INCLUDE_FLAG_MISSING_AT_UPLOAD;
+
+			} else {
+				/* Should have existed */
+				sieve_argument_validate_error(valdtr, arg,
+					"included %s script '%s' does not exist",
+					ext_include_script_location_name(ctx_data->location),
+					str_sanitize(script_name, 80));
+				sieve_script_unref(&script);
+				return FALSE;
+			}
+		}
+	}
+
+	ext_include_ast_link_included_script(cmd->ext, cmd->ast_node->ast, script);
+	ctx_data->script = script;
+
+	(void)sieve_ast_arguments_detach(arg, 1);
+	return TRUE;
+}
+
+/*
+ * Code Generation
+ */
+
+static bool cmd_include_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	struct cmd_include_context_data *ctx_data =
+		(struct cmd_include_context_data *) cmd->data;
+	const struct ext_include_script_info *included;
+	int ret;
+
+	/* Compile (if necessary) and include the script into the binary.
+	 * This yields the id of the binary block containing the compiled byte code.
+	 */
+	if ( (ret=ext_include_generate_include
+		(cgenv, cmd, ctx_data->location, ctx_data->flags, ctx_data->script,
+			&included)) < 0 )
+ 		return FALSE;
+
+	if ( ret > 0 ) {
+	 	(void)sieve_operation_emit(cgenv->sblock, cmd->ext, &include_operation);
+		(void)sieve_binary_emit_unsigned(cgenv->sblock, included->id);
+		(void)sieve_binary_emit_byte(cgenv->sblock, ctx_data->flags);
+	}
+
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool opc_include_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	const struct ext_include_script_info *included;
+	struct ext_include_binary_context *binctx;
+	unsigned int include_id, flags;
+
+	sieve_code_dumpf(denv, "INCLUDE:");
+
+	sieve_code_mark(denv);
+	if ( !sieve_binary_read_unsigned(denv->sblock, address, &include_id) )
+		return FALSE;
+
+	if ( !sieve_binary_read_byte(denv->sblock, address, &flags) )
+		return FALSE;
+
+	binctx = ext_include_binary_get_context(denv->oprtn->ext, denv->sbin);
+	included = ext_include_binary_script_get_included(binctx, include_id);
+	if ( included == NULL )
+		return FALSE;
+
+	sieve_code_descend(denv);
+	sieve_code_dumpf(denv, "script: `%s' from %s %s%s[ID: %d, BLOCK: %d]",
+		sieve_script_name(included->script), sieve_script_location(included->script),
+		((flags & EXT_INCLUDE_FLAG_ONCE) != 0 ? "(once) " : ""), 
+		((flags & EXT_INCLUDE_FLAG_OPTIONAL) != 0 ? "(optional) " : ""),
+		include_id, sieve_binary_block_get_id(included->block));
+
+	return TRUE;
+}
+
+/*
+ * Execution
+ */
+
+static int opc_include_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	unsigned int include_id, flags;
+
+	if ( !sieve_binary_read_unsigned(renv->sblock, address, &include_id) ) {
+		sieve_runtime_trace_error(renv, "invalid include-id operand");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	if ( !sieve_binary_read_unsigned(renv->sblock, address, &flags) ) {
+		sieve_runtime_trace_error(renv, "invalid flags operand");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	return ext_include_execute_include
+		(renv, include_id, (enum ext_include_flags)flags);
+}
+
+
+
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/include/cmd-return.c b/pigeonhole/src/lib-sieve/plugins/include/cmd-return.c
new file mode 100644
index 0000000..65a156d
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/include/cmd-return.c
@@ -0,0 +1,71 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+
+#include "sieve-code.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+
+#include "ext-include-common.h"
+
+/*
+ * Return command
+ *
+ * Syntax
+ *   return
+ */
+
+static bool cmd_return_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd);
+
+const struct sieve_command_def cmd_return = {
+	.identifier = "return",
+	.type = SCT_COMMAND,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.generate = cmd_return_generate
+};
+
+/*
+ * Return operation
+ */
+
+static int opc_return_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def return_operation = {
+	.mnemonic = "RETURN",
+	.ext_def = &include_extension,
+	.code = EXT_INCLUDE_OPERATION_RETURN,
+	.execute = opc_return_execute
+};
+
+/*
+ * Code generation
+ */
+
+static bool cmd_return_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &return_operation);
+
+	return TRUE;
+}
+
+/*
+ * Execution
+ */
+
+static int opc_return_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address ATTR_UNUSED)
+{
+	ext_include_execute_return(renv);
+	return SIEVE_EXEC_OK;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/include/ext-include-binary.c b/pigeonhole/src/lib-sieve/plugins/include/ext-include-binary.c
new file mode 100644
index 0000000..3711c30
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/include/ext-include-binary.c
@@ -0,0 +1,492 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+#include "sieve-script.h"
+#include "sieve-storage.h"
+#include "sieve-binary.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "sieve-ext-variables.h"
+
+#include "ext-include-common.h"
+#include "ext-include-limits.h"
+#include "ext-include-variables.h"
+#include "ext-include-binary.h"
+
+/*
+ * Forward declarations
+ */
+
+static bool ext_include_binary_pre_save
+	(const struct sieve_extension *ext, struct sieve_binary *sbin,
+		void *context, enum sieve_error *error_r);
+static bool ext_include_binary_open
+	(const struct sieve_extension *ext, struct sieve_binary *sbin,
+		void *context);
+static bool ext_include_binary_up_to_date
+	(const struct sieve_extension *ext, struct sieve_binary *sbin,
+		void *context, enum sieve_compile_flags cpflags);
+static void ext_include_binary_free
+	(const struct sieve_extension *ext, struct sieve_binary *sbin,
+		void *context);
+
+/*
+ * Binary include extension
+ */
+
+const struct sieve_binary_extension include_binary_ext = {
+	.extension = &include_extension,
+	.binary_pre_save = ext_include_binary_pre_save,
+	.binary_open = ext_include_binary_open,
+	.binary_free = ext_include_binary_free,
+	.binary_up_to_date = ext_include_binary_up_to_date
+};
+
+/*
+ * Binary context management
+ */
+
+struct ext_include_binary_context {
+	struct sieve_binary *binary;
+	struct sieve_binary_block *dependency_block;
+
+	HASH_TABLE(struct sieve_script *,
+		   struct ext_include_script_info *) included_scripts;
+	ARRAY(struct ext_include_script_info *) include_index;
+
+	struct sieve_variable_scope_binary *global_vars;
+
+	bool outdated:1;
+};
+
+static struct ext_include_binary_context *ext_include_binary_create_context
+(const struct sieve_extension *this_ext, struct sieve_binary *sbin)
+{
+	pool_t pool = sieve_binary_pool(sbin);
+
+	struct ext_include_binary_context *ctx =
+		p_new(pool, struct ext_include_binary_context, 1);
+
+	ctx->binary = sbin;
+	hash_table_create(&ctx->included_scripts, pool, 0,
+		sieve_script_hash, sieve_script_cmp);
+	p_array_init(&ctx->include_index, pool, 128);
+
+	sieve_binary_extension_set(sbin, this_ext, &include_binary_ext, ctx);
+
+	return ctx;
+}
+
+struct ext_include_binary_context *ext_include_binary_get_context
+(const struct sieve_extension *this_ext, struct sieve_binary *sbin)
+{
+	struct ext_include_binary_context *ctx = (struct ext_include_binary_context *)
+		sieve_binary_extension_get_context(sbin, this_ext);
+
+	if ( ctx == NULL )
+		ctx = ext_include_binary_create_context(this_ext, sbin);
+
+	return ctx;
+}
+
+struct ext_include_binary_context *ext_include_binary_init
+(const struct sieve_extension *this_ext, struct sieve_binary *sbin,
+	struct sieve_ast *ast)
+{
+	struct ext_include_ast_context *ast_ctx =
+		ext_include_get_ast_context(this_ext, ast);
+	struct ext_include_binary_context *ctx;
+
+	/* Get/create our context from the binary we are working on */
+	ctx = ext_include_binary_get_context(this_ext, sbin);
+
+	/* Create dependency block */
+	if ( ctx->dependency_block == 0 )
+		ctx->dependency_block =
+			sieve_binary_extension_create_block(sbin, this_ext);
+
+	if ( ctx->global_vars == NULL ) {
+		ctx->global_vars =
+			sieve_variable_scope_binary_create(ast_ctx->global_vars);
+		sieve_variable_scope_binary_ref(ctx->global_vars);
+	}
+
+	return ctx;
+}
+
+/*
+ * Script inclusion
+ */
+
+struct ext_include_script_info *ext_include_binary_script_include
+(struct ext_include_binary_context *binctx, 
+	enum ext_include_script_location location, enum ext_include_flags flags,
+	struct sieve_script *script,	struct sieve_binary_block *inc_block)
+{
+	pool_t pool = sieve_binary_pool(binctx->binary);
+	struct ext_include_script_info *incscript;
+
+	incscript = p_new(pool, struct ext_include_script_info, 1);
+	incscript->id = array_count(&binctx->include_index)+1;
+	incscript->location = location;
+	incscript->flags = flags;
+	incscript->script = script;
+	incscript->block = inc_block;
+
+	/* Unreferenced on binary_free */
+	sieve_script_ref(script);
+
+	hash_table_insert(binctx->included_scripts, script, incscript);
+	array_append(&binctx->include_index, &incscript, 1);
+
+	return incscript;
+}
+
+struct ext_include_script_info *ext_include_binary_script_get_include_info
+(struct ext_include_binary_context *binctx, struct sieve_script *script)
+{
+	struct ext_include_script_info *incscript =
+		hash_table_lookup(binctx->included_scripts, script);
+
+	return incscript;
+}
+
+const struct ext_include_script_info *ext_include_binary_script_get_included
+(struct ext_include_binary_context *binctx, unsigned int include_id)
+{
+	if ( include_id > 0 &&
+		(include_id - 1) < array_count(&binctx->include_index) ) {
+		struct ext_include_script_info *const *sinfo =
+			array_idx(&binctx->include_index, include_id - 1);
+
+		return *sinfo;
+	}
+
+	return NULL;
+}
+
+const struct ext_include_script_info *ext_include_binary_script_get
+(struct ext_include_binary_context *binctx, struct sieve_script *script)
+{
+	return hash_table_lookup(binctx->included_scripts, script);
+}
+
+unsigned int ext_include_binary_script_get_count
+(struct ext_include_binary_context *binctx)
+{
+	return array_count(&binctx->include_index);
+}
+
+/*
+ * Variables
+ */
+
+struct sieve_variable_scope_binary *ext_include_binary_get_global_scope
+(const struct sieve_extension *this_ext, struct sieve_binary *sbin)
+{
+	struct ext_include_binary_context *binctx =
+		ext_include_binary_get_context(this_ext, sbin);
+
+	return binctx->global_vars;
+}
+
+/*
+ * Binary extension
+ */
+
+static bool ext_include_binary_pre_save
+(const struct sieve_extension *ext ATTR_UNUSED,
+	struct sieve_binary *sbin ATTR_UNUSED, void *context,
+	enum sieve_error *error_r)
+{
+	struct ext_include_binary_context *binctx =
+		(struct ext_include_binary_context *) context;
+	struct ext_include_script_info *const *scripts;
+	struct sieve_binary_block *sblock = binctx->dependency_block;
+	unsigned int script_count, i;
+	bool result = TRUE;
+
+	sieve_binary_block_clear(sblock);
+
+	scripts = array_get(&binctx->include_index, &script_count);
+
+	sieve_binary_emit_unsigned(sblock, script_count);
+
+	for ( i = 0; i < script_count; i++ ) {
+		struct ext_include_script_info *incscript = scripts[i];
+
+		if ( incscript->block != NULL ) {
+			sieve_binary_emit_unsigned
+				(sblock, sieve_binary_block_get_id(incscript->block));
+		} else {
+			sieve_binary_emit_unsigned(sblock, 0);
+		}
+		sieve_binary_emit_byte(sblock, incscript->location);
+		sieve_binary_emit_cstring(sblock, sieve_script_name(incscript->script));
+		sieve_binary_emit_byte(sblock, incscript->flags);
+		sieve_script_binary_write_metadata(incscript->script, sblock);
+	}
+
+	result = ext_include_variables_save(sblock, binctx->global_vars, error_r);
+
+	return result;
+}
+
+static bool ext_include_binary_open
+(const struct sieve_extension *ext, struct sieve_binary *sbin, void *context)
+{
+	struct sieve_instance *svinst = ext->svinst;
+	struct ext_include_context *ext_ctx =
+		(struct ext_include_context *)ext->context;
+	struct ext_include_binary_context *binctx =
+		(struct ext_include_binary_context *) context;
+	struct sieve_binary_block *sblock;
+	unsigned int depcount, i, block_id;
+	sieve_size_t offset;
+
+	sblock = sieve_binary_extension_get_block(sbin, ext);
+	block_id = sieve_binary_block_get_id(sblock);
+
+	offset = 0;
+
+	if ( !sieve_binary_read_unsigned(sblock, &offset, &depcount) ) {
+		e_error(svinst->event,
+			"include: failed to read include count "
+			"for dependency block %d of binary %s", block_id,
+			sieve_binary_path(sbin));
+		return FALSE;
+	}
+
+	/* Check include limit */
+	if ( depcount > ext_ctx->max_includes ) {
+		e_error(svinst->event,
+			"include: binary %s includes too many scripts (%u > %u)",
+			sieve_binary_path(sbin), depcount, ext_ctx->max_includes);
+		return FALSE;
+	}
+
+	/* Read dependencies */
+	for ( i = 0; i < depcount; i++ ) {
+		unsigned int inc_block_id;
+		struct sieve_binary_block *inc_block = NULL;
+		unsigned int location, flags;
+		string_t *script_name;
+		struct sieve_storage *storage;
+		struct sieve_script *script;
+		enum sieve_error error;
+		int ret;
+
+		if (
+			!sieve_binary_read_unsigned(sblock, &offset, &inc_block_id) ||
+			!sieve_binary_read_byte(sblock, &offset, &location) ||
+			!sieve_binary_read_string(sblock, &offset, &script_name) ||
+			!sieve_binary_read_byte(sblock, &offset, &flags) ) {
+			/* Binary is corrupt, recompile */
+			e_error(svinst->event,
+				"include: failed to read included script "
+				"from dependency block %d of binary %s",
+				block_id, sieve_binary_path(sbin));
+			return FALSE;
+		}
+
+		if ( inc_block_id != 0 &&
+			(inc_block=sieve_binary_block_get(sbin, inc_block_id)) == NULL ) {
+			e_error(svinst->event,
+				"include: failed to find block %d for included script "
+				"from dependency block %d of binary %s",
+				inc_block_id, block_id,
+				sieve_binary_path(sbin));
+			return FALSE;
+		}
+
+		if ( location >= EXT_INCLUDE_LOCATION_INVALID ) {
+			/* Binary is corrupt, recompile */
+			e_error(svinst->event,
+				"include: dependency block %d of binary %s "
+				"uses invalid script location (id %d)",
+				block_id, sieve_binary_path(sbin), location);
+			return FALSE;
+		}
+
+		/* Can we find the script dependency ? */
+		storage = ext_include_get_script_storage
+			(ext, location, str_c(script_name), &error);
+		if ( storage == NULL ) {
+			/* No, recompile */
+			// FIXME: handle ':optional' in this case
+			return FALSE;
+		}
+
+		/* Can we open the script dependency ? */
+		script = sieve_storage_get_script
+			(storage, str_c(script_name), &error);
+		if ( script == NULL ) {
+			/* No, recompile */
+			return FALSE;
+		}
+		if ( sieve_script_open(script, &error) < 0 ) {
+			if ( error != SIEVE_ERROR_NOT_FOUND ) {
+				/* No, recompile */
+				return FALSE;
+			}
+
+			if ( (flags & EXT_INCLUDE_FLAG_OPTIONAL) == 0 ) {
+				/* Not supposed to be missing, recompile */
+				if ( svinst->debug ) {
+					e_debug(svinst->event, "include: "
+						"script '%s' included in binary %s is missing, "
+						"so recompile",
+						str_c(script_name),
+						sieve_binary_path(sbin));
+				}
+				return FALSE;
+			}
+
+		} else if (inc_block == NULL) {
+			/* Script exists, but it is missing from the binary, recompile no matter
+			 * what.
+			 */
+			if ( svinst->debug ) {
+				e_debug(svinst->event, "include: "
+					"script '%s' is missing in binary %s, but is now available, "
+					"so recompile", str_c(script_name), sieve_binary_path(sbin));
+			}
+			sieve_script_unref(&script);
+			return FALSE;
+		}
+
+		/* Can we read script metadata ? */
+		if ( (ret=sieve_script_binary_read_metadata
+			(script, sblock, &offset))	< 0 ) {
+			/* Binary is corrupt, recompile */
+			e_error(svinst->event, "include: "
+				"dependency block %d of binary %s "
+				"contains invalid script metadata for script %s",
+				block_id, sieve_binary_path(sbin),
+				sieve_script_location(script));
+			sieve_script_unref(&script);
+			return FALSE;
+		}
+
+		if ( ret == 0 )
+			binctx->outdated = TRUE;
+
+		(void)ext_include_binary_script_include
+			(binctx, location, flags, script, inc_block);
+
+		sieve_script_unref(&script);
+	}
+
+	if ( !ext_include_variables_load
+		(ext, sblock, &offset, &binctx->global_vars) )
+		return FALSE;
+
+	return TRUE;
+}
+
+static bool ext_include_binary_up_to_date
+(const struct sieve_extension *ext ATTR_UNUSED,
+	struct sieve_binary *sbin ATTR_UNUSED, void *context,
+	enum sieve_compile_flags cpflags ATTR_UNUSED)
+{
+	struct ext_include_binary_context *binctx =
+		(struct ext_include_binary_context *) context;
+
+	return !binctx->outdated;
+}
+
+static void ext_include_binary_free
+(const struct sieve_extension *ext ATTR_UNUSED,
+	struct sieve_binary *sbin ATTR_UNUSED, void *context)
+{
+	struct ext_include_binary_context *binctx =
+		(struct ext_include_binary_context *) context;
+	struct hash_iterate_context *hctx;
+	struct sieve_script *script;
+	struct ext_include_script_info *incscript;
+
+	/* Release references to all included script objects */
+	hctx = hash_table_iterate_init(binctx->included_scripts);
+	while ( hash_table_iterate
+		(hctx, binctx->included_scripts, &script, &incscript) )
+		sieve_script_unref(&incscript->script);
+	hash_table_iterate_deinit(&hctx);
+
+	hash_table_destroy(&binctx->included_scripts);
+
+	if ( binctx->global_vars != NULL )
+		sieve_variable_scope_binary_unref(&binctx->global_vars);
+}
+
+/*
+ * Dumping the binary
+ */
+
+bool ext_include_binary_dump
+(const struct sieve_extension *ext, struct sieve_dumptime_env *denv)
+{
+	struct sieve_binary *sbin = denv->sbin;
+	struct ext_include_binary_context *binctx =
+		ext_include_binary_get_context(ext, sbin);
+	struct hash_iterate_context *hctx;
+	struct sieve_script *script;
+	struct ext_include_script_info *incscript;
+
+	if ( !ext_include_variables_dump(denv, binctx->global_vars) )
+		return FALSE;
+
+	hctx = hash_table_iterate_init(binctx->included_scripts);
+	while ( hash_table_iterate
+		(hctx, binctx->included_scripts, &script, &incscript) ) {
+
+		if ( incscript->block == NULL ) {
+			sieve_binary_dump_sectionf(denv, "Included %s script '%s' (MISSING)",
+				ext_include_script_location_name(incscript->location),
+				sieve_script_name(incscript->script));
+
+		} else {
+			unsigned int block_id = sieve_binary_block_get_id(incscript->block);
+
+			sieve_binary_dump_sectionf(denv, "Included %s script '%s' (block: %d)",
+				ext_include_script_location_name(incscript->location),
+				sieve_script_name(incscript->script), block_id);
+
+			denv->sblock = incscript->block;
+			denv->cdumper = sieve_code_dumper_create(denv);
+
+			if ( denv->cdumper == NULL )
+				return FALSE;
+
+			sieve_code_dumper_run(denv->cdumper);
+			sieve_code_dumper_free(&(denv->cdumper));
+		}
+	}
+	hash_table_iterate_deinit(&hctx);
+
+	return TRUE;
+}
+
+bool ext_include_code_dump
+(const struct sieve_extension *ext, const struct sieve_dumptime_env *denv,
+	sieve_size_t *address ATTR_UNUSED)
+{
+	struct sieve_binary *sbin = denv->sbin;
+	struct ext_include_binary_context *binctx =
+		ext_include_binary_get_context(ext, sbin);
+	struct ext_include_context *ectx = ext_include_get_context(ext);
+
+	sieve_ext_variables_dump_set_scope
+		(ectx->var_ext, denv, ext,
+			sieve_variable_scope_binary_get(binctx->global_vars));
+
+	return TRUE;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/include/ext-include-binary.h b/pigeonhole/src/lib-sieve/plugins/include/ext-include-binary.h
new file mode 100644
index 0000000..066df2f
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/include/ext-include-binary.h
@@ -0,0 +1,64 @@
+#ifndef EXT_INCLUDE_BINARY_H
+#define EXT_INCLUDE_BINARY_H
+
+#include "sieve-common.h"
+
+/*
+ * Binary context management
+ */
+
+struct ext_include_binary_context;
+
+struct ext_include_binary_context *ext_include_binary_init
+	(const struct sieve_extension *this_ext, struct sieve_binary *sbin,
+		struct sieve_ast *ast);
+struct ext_include_binary_context *ext_include_binary_get_context
+	(const struct sieve_extension *this_ext, struct sieve_binary *sbin);
+
+/*
+ * Variables
+ */
+
+struct sieve_variable_scope_binary *ext_include_binary_get_global_scope
+	(const struct sieve_extension *this_ext, struct sieve_binary *sbin);
+
+/*
+ * Including scripts
+ */
+
+struct ext_include_script_info {
+	unsigned int id;
+
+	struct sieve_script *script;
+	enum ext_include_flags flags;
+	enum ext_include_script_location location;
+
+	struct sieve_binary_block *block;
+};
+
+struct ext_include_script_info *ext_include_binary_script_include
+	(struct ext_include_binary_context *binctx, 
+		enum ext_include_script_location location, enum ext_include_flags flags,
+		struct sieve_script *script, struct sieve_binary_block *inc_block);
+struct ext_include_script_info *ext_include_binary_script_get_include_info
+	(struct ext_include_binary_context *binctx, struct sieve_script *script);
+
+const struct ext_include_script_info *ext_include_binary_script_get_included
+	(struct ext_include_binary_context *binctx, unsigned int include_id);
+const struct ext_include_script_info *ext_include_binary_script_get
+	(struct ext_include_binary_context *binctx, struct sieve_script *script);
+unsigned int ext_include_binary_script_get_count
+	(struct ext_include_binary_context *binctx);
+
+/*
+ * Dumping the binary
+ */
+
+bool ext_include_binary_dump
+	(const struct sieve_extension *ext, struct sieve_dumptime_env *denv);
+bool ext_include_code_dump
+	(const struct sieve_extension *ext, const struct sieve_dumptime_env *denv,
+		sieve_size_t *address ATTR_UNUSED);
+
+#endif
+
diff --git a/pigeonhole/src/lib-sieve/plugins/include/ext-include-common.c b/pigeonhole/src/lib-sieve/plugins/include/ext-include-common.c
new file mode 100644
index 0000000..7af3f00
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/include/ext-include-common.c
@@ -0,0 +1,892 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "array.h"
+#include "str-sanitize.h"
+#include "home-expand.h"
+
+#include "sieve-common.h"
+#include "sieve-settings.h"
+#include "sieve-error.h"
+#include "sieve-script.h"
+#include "sieve-storage.h"
+#include "sieve-ast.h"
+#include "sieve-binary.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+
+#include "ext-include-common.h"
+#include "ext-include-limits.h"
+#include "ext-include-binary.h"
+#include "ext-include-variables.h"
+
+
+/*
+ * Forward declarations
+ */
+
+/* Generator context */
+
+struct ext_include_generator_context {
+	unsigned int nesting_depth;
+	struct sieve_script *script;
+	struct ext_include_generator_context *parent;
+};
+
+static inline struct ext_include_generator_context *
+ext_include_get_generator_context(const struct sieve_extension *ext_this,
+				  struct sieve_generator *gentr);
+
+/* Interpreter context */
+
+struct ext_include_interpreter_global {
+	ARRAY(struct sieve_script *) included_scripts;
+
+	struct sieve_variable_scope_binary *var_scope;
+	struct sieve_variable_storage *var_storage;
+};
+
+struct ext_include_interpreter_context {
+	struct ext_include_interpreter_context *parent;
+	struct ext_include_interpreter_global *global;
+
+	struct sieve_interpreter *interp;
+	pool_t pool;
+
+	unsigned int nesting_depth;
+
+	struct sieve_script *script;
+	const struct ext_include_script_info *script_info;
+
+	const struct ext_include_script_info *include;
+	bool returned;
+};
+
+/*
+ * Extension configuration
+ */
+
+/* Extension hooks */
+
+bool ext_include_load(const struct sieve_extension *ext, void **context)
+{
+	struct sieve_instance *svinst = ext->svinst;
+	struct ext_include_context *ctx;
+	const char *location;
+	unsigned long long int uint_setting;
+
+	if (*context != NULL)
+		ext_include_unload(ext);
+
+	ctx = i_new(struct ext_include_context, 1);
+
+	/* Get location for :global scripts */
+	location = sieve_setting_get(svinst, "sieve_global");
+	if (location == NULL)
+		location = sieve_setting_get(svinst, "sieve_global_dir");
+
+	if (location == NULL) {
+		e_debug(svinst->event, "include: "
+			"sieve_global is not set; "
+			"it is currently not possible to include `:global' scripts.");
+	}
+
+	ctx->global_location = i_strdup(location);
+
+	/* Get limits */
+	ctx->max_nesting_depth = EXT_INCLUDE_DEFAULT_MAX_NESTING_DEPTH;
+	ctx->max_includes = EXT_INCLUDE_DEFAULT_MAX_INCLUDES;
+
+	if (sieve_setting_get_uint_value(
+		svinst, "sieve_include_max_nesting_depth", &uint_setting))
+		ctx->max_nesting_depth = (unsigned int)uint_setting;
+	if (sieve_setting_get_uint_value(
+		svinst, "sieve_include_max_includes", &uint_setting))
+		ctx->max_includes = (unsigned int)uint_setting;
+
+	/* Extension dependencies */
+	ctx->var_ext = sieve_ext_variables_get_extension(ext->svinst);
+
+	*context = (void *)ctx;
+	return TRUE;
+}
+
+void ext_include_unload(const struct sieve_extension *ext)
+{
+	struct ext_include_context *ctx =
+		(struct ext_include_context *)ext->context;
+
+	if (ctx->global_storage != NULL)
+		sieve_storage_unref(&ctx->global_storage);
+	if (ctx->personal_storage != NULL)
+		sieve_storage_unref(&ctx->personal_storage);
+
+	i_free(ctx->global_location);
+	i_free(ctx);
+}
+
+/*
+ * Script access
+ */
+
+struct sieve_storage *
+ext_include_get_script_storage(const struct sieve_extension *ext,
+			       enum ext_include_script_location location,
+			       const char *script_name,
+			       enum sieve_error *error_r)
+{
+	struct sieve_instance *svinst = ext->svinst;
+	struct ext_include_context *ctx =
+		(struct ext_include_context *)ext->context;
+
+	switch (location) {
+	case EXT_INCLUDE_LOCATION_PERSONAL:
+		if (ctx->personal_storage == NULL) {
+			ctx->personal_storage =
+				sieve_storage_create_main(svinst, NULL, 0,
+							  error_r);
+		}
+		return ctx->personal_storage;
+	case EXT_INCLUDE_LOCATION_GLOBAL:
+		if (ctx->global_location == NULL) {
+			e_info(svinst->event, "include: "
+				"sieve_global is unconfigured; "
+				"include of `:global' script `%s' is therefore not possible",
+				str_sanitize(script_name, 80));
+			if (error_r != NULL)
+				*error_r = SIEVE_ERROR_NOT_FOUND;
+			return NULL;
+		}
+		if (ctx->global_storage == NULL) {
+			ctx->global_storage = sieve_storage_create(
+				svinst, ctx->global_location, 0, error_r);
+		}
+		return ctx->global_storage;
+	default:
+		break;
+	}
+
+	i_unreached();
+	return NULL;
+}
+
+/*
+ * AST context management
+ */
+
+static void
+ext_include_ast_free(const struct sieve_extension *ext ATTR_UNUSED,
+		     struct sieve_ast *ast ATTR_UNUSED, void *context)
+{
+	struct ext_include_ast_context *actx =
+		(struct ext_include_ast_context *)context;
+	struct sieve_script **scripts;
+	unsigned int count, i;
+
+	/* Unreference included scripts */
+	scripts = array_get_modifiable(&actx->included_scripts, &count);
+	for (i = 0; i < count; i++) {
+		sieve_script_unref(&scripts[i]);
+	}
+
+	/* Unreference variable scopes */
+	if (actx->global_vars != NULL)
+		sieve_variable_scope_unref(&actx->global_vars);
+}
+
+static const struct sieve_ast_extension include_ast_extension = {
+	&include_extension,
+	ext_include_ast_free
+};
+
+struct ext_include_ast_context *
+ext_include_create_ast_context(const struct sieve_extension *this_ext,
+			       struct sieve_ast *ast, struct sieve_ast *parent)
+{
+	struct ext_include_ast_context *actx;
+
+	pool_t pool = sieve_ast_pool(ast);
+	actx = p_new(pool, struct ext_include_ast_context, 1);
+	p_array_init(&actx->included_scripts, pool, 32);
+
+	if (parent != NULL) {
+		struct ext_include_ast_context *parent_ctx =
+			(struct ext_include_ast_context *)
+			sieve_ast_extension_get_context(parent, this_ext);
+
+		actx->global_vars = parent_ctx->global_vars;
+		i_assert(actx->global_vars != NULL);
+
+		sieve_variable_scope_ref(actx->global_vars);
+	} else {
+		struct ext_include_context *ectx =
+			ext_include_get_context(this_ext);
+
+		actx->global_vars = sieve_variable_scope_create(
+			this_ext->svinst, ectx->var_ext, this_ext);
+	}
+
+	sieve_ast_extension_register(ast, this_ext, &include_ast_extension,
+				     (void *)actx);
+	return actx;
+}
+
+struct ext_include_ast_context *
+ext_include_get_ast_context(const struct sieve_extension *this_ext,
+			    struct sieve_ast *ast)
+{
+	struct ext_include_ast_context *actx =
+		(struct ext_include_ast_context *)
+		sieve_ast_extension_get_context(ast, this_ext);
+
+	if (actx != NULL)
+		return actx;
+	return ext_include_create_ast_context(this_ext, ast, NULL);
+}
+
+void ext_include_ast_link_included_script(
+	const struct sieve_extension *this_ext, struct sieve_ast *ast,
+	struct sieve_script *script)
+{
+	struct ext_include_ast_context *actx =
+		ext_include_get_ast_context(this_ext, ast);
+
+	array_append(&actx->included_scripts, &script, 1);
+}
+
+bool ext_include_validator_have_variables(
+	const struct sieve_extension *this_ext, struct sieve_validator *valdtr)
+{
+	struct ext_include_context *ectx = ext_include_get_context(this_ext);
+
+	return sieve_ext_variables_is_active(ectx->var_ext, valdtr);
+}
+
+/*
+ * Generator context management
+ */
+
+static struct ext_include_generator_context *
+ext_include_create_generator_context(
+	struct sieve_generator *gentr,
+	struct ext_include_generator_context *parent,
+	struct sieve_script *script)
+{
+	struct ext_include_generator_context *ctx;
+
+	pool_t pool = sieve_generator_pool(gentr);
+	ctx = p_new(pool, struct ext_include_generator_context, 1);
+	ctx->parent = parent;
+	ctx->script = script;
+	if (parent == NULL)
+		ctx->nesting_depth = 0;
+	else
+		ctx->nesting_depth = parent->nesting_depth + 1;
+
+	return ctx;
+}
+
+static inline struct ext_include_generator_context *
+ext_include_get_generator_context(const struct sieve_extension *this_ext,
+				  struct sieve_generator *gentr)
+{
+	return (struct ext_include_generator_context *)
+		sieve_generator_extension_get_context(gentr, this_ext);
+}
+
+static inline void
+ext_include_initialize_generator_context(
+	const struct sieve_extension *this_ext, struct sieve_generator *gentr,
+	struct ext_include_generator_context *parent,
+	struct sieve_script *script)
+{
+	sieve_generator_extension_set_context(
+		gentr, this_ext,
+		ext_include_create_generator_context(gentr, parent, script));
+}
+
+void ext_include_register_generator_context(
+	const struct sieve_extension *this_ext,
+	const struct sieve_codegen_env *cgenv)
+{
+	struct ext_include_generator_context *ctx =
+		ext_include_get_generator_context(this_ext, cgenv->gentr);
+
+	/* Initialize generator context if necessary */
+	if (ctx == NULL) {
+		ctx = ext_include_create_generator_context(
+			cgenv->gentr, NULL, cgenv->script);
+
+		sieve_generator_extension_set_context(
+			cgenv->gentr, this_ext, (void *)ctx);
+	}
+
+	/* Initialize ast context if necessary */
+	(void)ext_include_get_ast_context(this_ext, cgenv->ast);
+	(void)ext_include_binary_init(this_ext, cgenv->sbin, cgenv->ast);
+}
+
+/*
+ * Runtime initialization
+ */
+
+static int
+ext_include_runtime_init(const struct sieve_extension *this_ext,
+			 const struct sieve_runtime_env *renv,
+			 void *context, bool deferred ATTR_UNUSED)
+{
+	struct ext_include_interpreter_context *ctx =
+		(struct ext_include_interpreter_context *)context;
+	struct ext_include_context *ectx = ext_include_get_context(this_ext);
+
+	if (ctx->parent == NULL) {
+		ctx->global = p_new(ctx->pool,
+				    struct ext_include_interpreter_global, 1);
+		p_array_init(&ctx->global->included_scripts, ctx->pool, 10);
+
+		ctx->global->var_scope =
+			ext_include_binary_get_global_scope(
+				this_ext, renv->sbin);
+		ctx->global->var_storage =
+			sieve_variable_storage_create(ectx->var_ext, ctx->pool,
+						      ctx->global->var_scope);
+	} else {
+		ctx->global = ctx->parent->global;
+	}
+
+	sieve_ext_variables_runtime_set_storage(ectx->var_ext, renv, this_ext,
+						ctx->global->var_storage);
+	return SIEVE_EXEC_OK;
+}
+
+static struct sieve_interpreter_extension include_interpreter_extension = {
+	.ext_def = &include_extension,
+	.run = ext_include_runtime_init
+};
+
+/*
+ * Interpreter context management
+ */
+
+static struct ext_include_interpreter_context *
+ext_include_interpreter_context_create(
+	struct sieve_interpreter *interp,
+	struct ext_include_interpreter_context *parent,
+	struct sieve_script *script,
+	const struct ext_include_script_info *sinfo)
+{
+	struct ext_include_interpreter_context *ctx;
+
+	pool_t pool = sieve_interpreter_pool(interp);
+	ctx = p_new(pool, struct ext_include_interpreter_context, 1);
+	ctx->pool = pool;
+	ctx->parent = parent;
+	ctx->interp = interp;
+	ctx->script = script;
+	ctx->script_info = sinfo;
+
+	if (parent == NULL)
+		ctx->nesting_depth = 0;
+	else
+		ctx->nesting_depth = parent->nesting_depth + 1;
+	return ctx;
+}
+
+static inline struct ext_include_interpreter_context *
+ext_include_get_interpreter_context(const struct sieve_extension *this_ext,
+				    struct sieve_interpreter *interp)
+{
+	return (struct ext_include_interpreter_context *)
+		sieve_interpreter_extension_get_context(interp, this_ext);
+}
+
+static inline struct ext_include_interpreter_context *
+ext_include_interpreter_context_init_child(
+	const struct sieve_extension *this_ext,
+	struct sieve_interpreter *interp,
+	struct ext_include_interpreter_context *parent,
+	struct sieve_script *script,
+	const struct ext_include_script_info *sinfo)
+{
+	struct ext_include_interpreter_context *ctx =
+		ext_include_interpreter_context_create(interp, parent,
+						       script, sinfo);
+
+	sieve_interpreter_extension_register(interp, this_ext,
+					     &include_interpreter_extension,
+					     ctx);
+	return ctx;
+}
+
+void ext_include_interpreter_context_init(
+	const struct sieve_extension *this_ext,
+	struct sieve_interpreter *interp)
+{
+	struct ext_include_interpreter_context *ctx =
+		ext_include_get_interpreter_context(this_ext, interp);
+
+	/* Is this is the top-level interpreter ? */
+	if (ctx == NULL) {
+		struct sieve_script *script;
+
+		/* Initialize top context */
+		script = sieve_interpreter_script(interp);
+		ctx = ext_include_interpreter_context_create(interp, NULL,
+							     script, NULL);
+
+		sieve_interpreter_extension_register(
+			interp, this_ext, &include_interpreter_extension,
+			(void *)ctx);
+	}
+}
+
+struct sieve_variable_storage *
+ext_include_interpreter_get_global_variables(
+	const struct sieve_extension *this_ext,
+	struct sieve_interpreter *interp)
+{
+	struct ext_include_interpreter_context *ctx =
+		ext_include_get_interpreter_context(this_ext, interp);
+
+	return ctx->global->var_storage;
+}
+
+/*
+ * Including a script during code generation
+ */
+
+int ext_include_generate_include(
+	const struct sieve_codegen_env *cgenv, struct sieve_command *cmd,
+	enum ext_include_script_location location, enum ext_include_flags flags,
+	struct sieve_script *script,
+	const struct ext_include_script_info **included_r)
+{
+	const struct sieve_extension *this_ext = cmd->ext;
+	struct ext_include_context *ext_ctx =
+		(struct ext_include_context *)this_ext->context;
+	int result = 1;
+	struct sieve_ast *ast;
+	struct sieve_binary *sbin = cgenv->sbin;
+	struct sieve_generator *gentr = cgenv->gentr;
+	struct ext_include_binary_context *binctx;
+	struct sieve_generator *subgentr;
+	struct ext_include_generator_context *ctx =
+		ext_include_get_generator_context(this_ext, gentr);
+	struct ext_include_generator_context *pctx;
+	struct sieve_error_handler *ehandler =
+		sieve_generator_error_handler(gentr);
+	struct ext_include_script_info *included;
+
+	*included_r = NULL;
+
+	/* Just to be sure: do not include more scripts when errors have occured
+	   already.
+	 */
+	if (sieve_get_errors(ehandler) > 0)
+		return -1;
+
+	/* Limit nesting level */
+	if (ctx->nesting_depth >= ext_ctx->max_nesting_depth) {
+		sieve_command_generate_error(
+			gentr, cmd,
+			"cannot nest includes deeper than %d levels",
+			ext_ctx->max_nesting_depth);
+		return -1;
+	}
+
+	/* Check for circular include */
+	if ((flags & EXT_INCLUDE_FLAG_ONCE) == 0) {
+		pctx = ctx;
+		while (pctx != NULL) {
+			if (sieve_script_equals(pctx->script, script)) {
+				/* Just drop circular include when uploading
+				   inactive script;  not an error
+				 */
+				if ((cgenv->flags & SIEVE_COMPILE_FLAG_UPLOADED) != 0 &&
+				    (cgenv->flags & SIEVE_COMPILE_FLAG_ACTIVATED) == 0) {
+					sieve_command_generate_warning(
+						gentr, cmd,
+						"circular include (ignored during upload)");
+					return 0;
+				}
+
+				sieve_command_generate_error(gentr, cmd,
+							     "circular include");
+				return -1;
+			}
+
+			pctx = pctx->parent;
+		}
+	}
+
+	/* Get binary context */
+	binctx = ext_include_binary_init(this_ext, sbin, cgenv->ast);
+
+	/* Is the script already compiled into the current binary? */
+	included = ext_include_binary_script_get_include_info(binctx, script);
+	if (included != NULL) {
+		/* Yes, only update flags */
+		if ((flags & EXT_INCLUDE_FLAG_OPTIONAL) == 0)
+			included->flags &= ENUM_NEGATE(EXT_INCLUDE_FLAG_OPTIONAL);
+		if ((flags & EXT_INCLUDE_FLAG_ONCE) == 0)
+			included->flags &= ENUM_NEGATE(EXT_INCLUDE_FLAG_ONCE);
+	} else 	{
+		const char *script_name = sieve_script_name(script);
+		enum sieve_compile_flags cpflags = cgenv->flags;
+
+		/* No, include new script */
+
+		/* Check whether include limit is exceeded */
+		if (ext_include_binary_script_get_count(binctx) >=
+		    ext_ctx->max_includes) {
+	 		sieve_command_generate_error(
+				gentr, cmd, "failed to include script '%s': "
+				"no more than %u includes allowed",
+				str_sanitize(script_name, 80),
+				ext_ctx->max_includes);
+	 		return -1;
+		}
+
+		/* Allocate a new block in the binary and mark the script as
+		   included. */
+		if (!sieve_script_is_open(script)) {
+			/* Just making an empty entry to mark a missing script
+			 */
+			i_assert((flags & EXT_INCLUDE_FLAG_MISSING_AT_UPLOAD) != 0 ||
+				 (flags & EXT_INCLUDE_FLAG_OPTIONAL) != 0);
+			included = ext_include_binary_script_include(
+				binctx, location, flags, script, NULL);
+			result = 0;
+
+		} else {
+			struct sieve_binary_block *inc_block =
+				sieve_binary_block_create(sbin);
+
+			/* Real include */
+			included = ext_include_binary_script_include(
+				binctx, location, flags, script, inc_block);
+
+			/* Parse */
+			if ((ast = sieve_parse(script, ehandler,
+					       NULL)) == NULL) {
+		 		sieve_command_generate_error(
+					gentr, cmd,
+		 			"failed to parse included script '%s'",
+					str_sanitize(script_name, 80));
+		 		return -1;
+			}
+
+			/* Included scripts inherit global variable scope */
+			(void)ext_include_create_ast_context(
+				this_ext, ast, cmd->ast_node->ast);
+
+			if (location == EXT_INCLUDE_LOCATION_GLOBAL) {
+				cpflags &=
+					ENUM_NEGATE(SIEVE_EXECUTE_FLAG_NOGLOBAL);
+			} else {
+				cpflags |= SIEVE_EXECUTE_FLAG_NOGLOBAL;
+			}
+
+			/* Validate */
+			if (!sieve_validate(ast, ehandler, cpflags, NULL)) {
+				sieve_command_generate_error(
+					gentr, cmd,
+					"failed to validate included script '%s'",
+					str_sanitize(script_name, 80));
+		 		sieve_ast_unref(&ast);
+		 		return -1;
+		 	}
+
+			/* Generate
+
+			   FIXME: It might not be a good idea to recurse code
+			   generation for included scripts.
+			 */
+		 	subgentr = sieve_generator_create(ast, ehandler, cpflags);
+			ext_include_initialize_generator_context(
+				cmd->ext, subgentr, ctx, script);
+
+			if (sieve_generator_run(subgentr, &inc_block) == NULL) {
+				sieve_command_generate_error(
+					gentr, cmd,
+					"failed to generate code for included script '%s'",
+					str_sanitize(script_name, 80));
+		 		result = -1;
+			}
+
+			sieve_generator_free(&subgentr);
+
+			/* Cleanup */
+			sieve_ast_unref(&ast);
+		}
+	}
+
+	if (result > 0)
+		*included_r = included;
+	return result;
+}
+
+/*
+ * Executing an included script during interpretation
+ */
+
+static bool
+ext_include_runtime_check_circular(
+	struct ext_include_interpreter_context *ctx,
+	const struct ext_include_script_info *include)
+{
+	struct ext_include_interpreter_context *pctx;
+
+	pctx = ctx;
+	while (pctx != NULL) {
+
+		if (sieve_script_equals(include->script, pctx->script))
+			return TRUE;
+
+		pctx = pctx->parent;
+	}
+
+	return FALSE;
+}
+
+static bool
+ext_include_runtime_include_mark(struct ext_include_interpreter_context *ctx,
+				 const struct ext_include_script_info *include,
+				 bool once)
+{
+	struct sieve_script *const *includes;
+	unsigned int count, i;
+
+	includes = array_get(&ctx->global->included_scripts, &count);
+	for (i = 0; i < count; i++) {
+		if (sieve_script_equals(include->script, includes[i]))
+			return (!once);
+	}
+
+	array_append(&ctx->global->included_scripts, &include->script, 1);
+	return TRUE;
+}
+
+int ext_include_execute_include(const struct sieve_runtime_env *renv,
+				unsigned int include_id,
+				enum ext_include_flags flags)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	const struct sieve_extension *this_ext = renv->oprtn->ext;
+	int result = SIEVE_EXEC_OK;
+	struct ext_include_interpreter_context *ctx;
+	const struct ext_include_script_info *included;
+	struct ext_include_binary_context *binctx =
+		ext_include_binary_get_context(this_ext, renv->sbin);
+	bool once = ((flags & EXT_INCLUDE_FLAG_ONCE) != 0);
+	unsigned int block_id;
+
+	/* Check for invalid include id (== corrupt binary) */
+	included = ext_include_binary_script_get_included(binctx, include_id);
+	if (included == NULL) {
+		sieve_runtime_trace_error(
+			renv, "include: include id %d is invalid", include_id);
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	ctx = ext_include_get_interpreter_context(this_ext, renv->interp);
+	block_id = sieve_binary_block_get_id(included->block);
+
+	/* If :once modifier is specified, check for duplicate include */
+	if (ext_include_runtime_include_mark(ctx, included, once)) {
+		sieve_runtime_trace(
+			renv, SIEVE_TRLVL_NONE,
+			"include: start script '%s' [inc id: %d, block: %d]",
+			sieve_script_name(included->script),
+			include_id, block_id);
+	} else {
+		/* skip */
+		sieve_runtime_trace(
+			renv, SIEVE_TRLVL_NONE,
+			"include: skipped include for script '%s' "
+			"[inc id: %d, block: %d]; already run once",
+			sieve_script_name(included->script),
+			include_id, block_id);
+		return result;
+	}
+
+	/* Check circular include during interpretation as well.
+	 * Let's not trust binaries.
+	 */
+	if (ext_include_runtime_check_circular(ctx, included)) {
+		sieve_runtime_trace_error(renv,
+			"include: circular include of script '%s' "
+			"[inc id: %d, block: %d]",
+			sieve_script_name(included->script),
+			include_id, block_id);
+
+		/* Situation has no valid way to emerge at runtime */
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	if (ctx->parent == NULL) {
+		struct ext_include_interpreter_context *curctx = NULL;
+		struct sieve_error_handler *ehandler = renv->ehandler;
+		struct sieve_interpreter *subinterp;
+		bool interrupted = FALSE;
+
+		/* We are the top-level interpreter instance */
+		if (result == SIEVE_EXEC_OK) {
+			struct sieve_execute_env eenv_new = *eenv;
+
+			if (included->location != EXT_INCLUDE_LOCATION_GLOBAL)
+				eenv_new.flags |= SIEVE_EXECUTE_FLAG_NOGLOBAL;
+			else {
+				eenv_new.flags &=
+					ENUM_NEGATE(SIEVE_EXECUTE_FLAG_NOGLOBAL);
+			}
+
+			/* Create interpreter for top-level included script
+			   (first sub-interpreter)
+			 */
+			subinterp = sieve_interpreter_create_for_block(
+				included->block, included->script, renv->interp,
+				&eenv_new, ehandler);
+			if (subinterp != NULL) {
+				curctx = ext_include_interpreter_context_init_child(
+					this_ext, subinterp, ctx, included->script,
+					included);
+
+				/* Activate and start the top-level included script */
+				result = sieve_interpreter_start(
+					subinterp, renv->result, &interrupted);
+			} else {
+				result = SIEVE_EXEC_BIN_CORRUPT;
+			}
+		}
+
+		/* Included scripts can have includes of their own. This is not
+		   implemented recursively. Rather, the sub-interpreter
+		   interrupts and defers the include to the top-level
+		   interpreter, which is here. */
+		if (result == SIEVE_EXEC_OK && interrupted &&
+		    !curctx->returned) {
+			while (result == SIEVE_EXEC_OK) {
+				if (((interrupted && curctx->returned) ||
+				     (!interrupted)) &&
+				    curctx->parent != NULL) {
+					const struct ext_include_script_info *ended_script =
+						curctx->script_info;
+
+					/* Sub-interpreter ended or executed
+					   return */
+
+					/* Ascend interpreter stack */
+					curctx = curctx->parent;
+					sieve_interpreter_free(&subinterp);
+
+					sieve_runtime_trace(renv, SIEVE_TRLVL_NONE,
+						"include: script '%s' ended "
+						"[inc id: %d, block: %d]",
+						sieve_script_name(ended_script->script),
+						ended_script->id,
+						sieve_binary_block_get_id(ended_script->block));
+
+					/* This is the top-most sub-interpreter,
+					   bail out */
+					if (curctx->parent == NULL)
+						break;
+
+					subinterp = curctx->interp;
+
+					/* Continue parent */
+					curctx->include = NULL;
+					curctx->returned = FALSE;
+
+					result = sieve_interpreter_continue(
+						subinterp, &interrupted);
+				} else {
+					if (curctx->include != NULL) {
+						/* Sub-include requested */
+
+						if (result == SIEVE_EXEC_OK) {
+							struct sieve_execute_env eenv_new = *eenv;
+
+							if (curctx->include->location != EXT_INCLUDE_LOCATION_GLOBAL)
+								eenv_new.flags |= SIEVE_EXECUTE_FLAG_NOGLOBAL;
+							else {
+								eenv_new.flags &=
+									ENUM_NEGATE(SIEVE_EXECUTE_FLAG_NOGLOBAL);
+							}
+
+							/* Create sub-interpreter */
+							subinterp = sieve_interpreter_create_for_block(
+								curctx->include->block, curctx->include->script,
+								curctx->interp, &eenv_new, ehandler);
+							if (subinterp != NULL) {
+								curctx = ext_include_interpreter_context_init_child(
+									this_ext, subinterp, curctx,
+									curctx->include->script, curctx->include);
+
+								/* Start the sub-include's interpreter */
+								curctx->include = NULL;
+								curctx->returned = FALSE;
+								result = sieve_interpreter_start(
+									subinterp, renv->result, &interrupted);
+							} else {
+								result = SIEVE_EXEC_BIN_CORRUPT;
+							}
+						}
+					} else {
+						/* Sub-interpreter was interrupted outside
+						   this extension, probably stop command was
+						   executed. Generate an interrupt ourselves,
+						   ending all script execution. */
+						sieve_interpreter_interrupt(renv->interp);
+						break;
+					}
+				}
+			}
+		}
+
+		/* Free any sub-interpreters that might still be active */
+		while (curctx != NULL && curctx->parent != NULL) {
+			struct ext_include_interpreter_context *nextctx	=
+				curctx->parent;
+			struct sieve_interpreter *killed_interp = curctx->interp;
+			const struct ext_include_script_info *ended_script =
+				curctx->script_info;
+
+			/* This kills curctx too */
+			sieve_interpreter_free(&killed_interp);
+
+			sieve_runtime_trace(
+				renv, SIEVE_TRLVL_NONE,
+				"include: script '%s' ended [id: %d, block: %d]",
+				sieve_script_name(ended_script->script),
+				ended_script->id,
+				sieve_binary_block_get_id(ended_script->block));
+
+			/* Luckily we recorded the parent earlier */
+			curctx = nextctx;
+		}
+
+	} else {
+		/* We are an included script already, defer inclusion to main
+		   interpreter */
+		ctx->include = included;
+		sieve_interpreter_interrupt(renv->interp);
+	}
+
+	return result;
+}
+
+void ext_include_execute_return(const struct sieve_runtime_env *renv)
+{
+	const struct sieve_extension *this_ext = renv->oprtn->ext;
+	struct ext_include_interpreter_context *ctx =
+		ext_include_get_interpreter_context(this_ext, renv->interp);
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS,
+			    "return: exiting included script");
+	ctx->returned = TRUE;
+	sieve_interpreter_interrupt(renv->interp);
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/include/ext-include-common.h b/pigeonhole/src/lib-sieve/plugins/include/ext-include-common.h
new file mode 100644
index 0000000..44bfe9a
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/include/ext-include-common.h
@@ -0,0 +1,170 @@
+#ifndef EXT_INCLUDE_COMMON_H
+#define EXT_INCLUDE_COMMON_H
+
+#include "lib.h"
+#include "hash.h"
+
+#include "sieve-common.h"
+#include "sieve-extensions.h"
+
+/*
+ * Forward declarations
+ */
+
+struct ext_include_script_info;
+struct ext_include_binary_context;
+
+/*
+ * Types
+ */
+
+enum ext_include_flags { // stored in one byte
+	EXT_INCLUDE_FLAG_ONCE = 0x01,
+	EXT_INCLUDE_FLAG_OPTIONAL = 0x02,
+	EXT_INCLUDE_FLAG_MISSING_AT_UPLOAD = 0x04
+};
+
+enum ext_include_script_location {
+	EXT_INCLUDE_LOCATION_PERSONAL,
+	EXT_INCLUDE_LOCATION_GLOBAL,
+	EXT_INCLUDE_LOCATION_INVALID
+};
+
+static inline const char *
+ext_include_script_location_name(enum ext_include_script_location location)
+{
+	switch (location) {
+	case EXT_INCLUDE_LOCATION_PERSONAL:
+		return "personal";
+	case EXT_INCLUDE_LOCATION_GLOBAL:
+		return "global";
+	default:
+		break;
+	}
+
+	return "[INVALID LOCATION]";
+}
+
+
+/*
+ * Extension
+ */
+
+extern const struct sieve_extension_def include_extension;
+extern const struct sieve_binary_extension include_binary_ext;
+
+bool ext_include_load(const struct sieve_extension *ext, void **context);
+void ext_include_unload(const struct sieve_extension *ext);
+
+/*
+ * Commands
+ */
+
+extern const struct sieve_command_def cmd_include;
+extern const struct sieve_command_def cmd_return;
+extern const struct sieve_command_def cmd_global;
+
+/* DEPRICATED */
+extern const struct sieve_command_def cmd_import;
+extern const struct sieve_command_def cmd_export;
+
+/*
+ * Operations
+ */
+
+enum ext_include_opcode {
+	EXT_INCLUDE_OPERATION_INCLUDE,
+	EXT_INCLUDE_OPERATION_RETURN,
+	EXT_INCLUDE_OPERATION_GLOBAL
+};
+
+extern const struct sieve_operation_def include_operation;
+extern const struct sieve_operation_def return_operation;
+extern const struct sieve_operation_def global_operation;
+
+/*
+ * Script access
+ */
+
+struct sieve_storage *
+ext_include_get_script_storage(const struct sieve_extension *ext,
+			       enum ext_include_script_location location,
+			       const char *script_name,
+			       enum sieve_error *error_r);
+/*
+ * Context
+ */
+
+/* Extension context */
+
+struct ext_include_context {
+	/* Extension dependencies */
+	const struct sieve_extension *var_ext;
+
+	/* Configuration */
+ 	char *global_location;
+
+	struct sieve_storage *global_storage;
+	struct sieve_storage *personal_storage;
+
+	unsigned int max_nesting_depth;
+	unsigned int max_includes;
+};
+
+static inline struct ext_include_context *
+ext_include_get_context(const struct sieve_extension *ext)
+{
+	return (struct ext_include_context *) ext->context;
+}
+
+/* AST Context */
+
+struct ext_include_ast_context {
+	struct sieve_variable_scope *global_vars;
+
+	ARRAY(struct sieve_script *) included_scripts;
+};
+
+struct ext_include_ast_context *
+ext_include_create_ast_context(const struct sieve_extension *this_ext,
+			       struct sieve_ast *ast, struct sieve_ast *parent);
+struct ext_include_ast_context *
+ext_include_get_ast_context(const struct sieve_extension *this_ext,
+			    struct sieve_ast *ast);
+
+void ext_include_ast_link_included_script(
+	const struct sieve_extension *this_ext, struct sieve_ast *ast,
+	struct sieve_script *script);
+
+bool ext_include_validator_have_variables(
+	const struct sieve_extension *this_ext, struct sieve_validator *valdtr);
+
+/* Generator context */
+
+void ext_include_register_generator_context(
+	const struct sieve_extension *this_ext,
+	const struct sieve_codegen_env *cgenv);
+
+int ext_include_generate_include(
+	const struct sieve_codegen_env *cgenv, struct sieve_command *cmd,
+	enum ext_include_script_location location, enum ext_include_flags flags,
+	struct sieve_script *script,
+	const struct ext_include_script_info **included_r);
+
+/* Interpreter context */
+
+void ext_include_interpreter_context_init(
+	const struct sieve_extension *this_ext,
+	struct sieve_interpreter *interp);
+
+int ext_include_execute_include(const struct sieve_runtime_env *renv,
+				unsigned int block_id,
+				enum ext_include_flags flags);
+void ext_include_execute_return(const struct sieve_runtime_env *renv);
+
+struct sieve_variable_storage *
+ext_include_interpreter_get_global_variables(
+	const struct sieve_extension *this_ext,
+	struct sieve_interpreter *interp);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/include/ext-include-limits.h b/pigeonhole/src/lib-sieve/plugins/include/ext-include-limits.h
new file mode 100644
index 0000000..37246c0
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/include/ext-include-limits.h
@@ -0,0 +1,9 @@
+#ifndef EXT_INCLUDE_LIMITS_H
+#define EXT_INCLUDE_LIMITS_H
+
+#include "sieve-common.h"
+
+#define EXT_INCLUDE_DEFAULT_MAX_NESTING_DEPTH 10
+#define EXT_INCLUDE_DEFAULT_MAX_INCLUDES      255
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/include/ext-include-variables.c b/pigeonhole/src/lib-sieve/plugins/include/ext-include-variables.c
new file mode 100644
index 0000000..28cd803
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/include/ext-include-variables.c
@@ -0,0 +1,254 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+#include "sieve-script.h"
+#include "sieve-ast.h"
+#include "sieve-binary.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "sieve-ext-variables.h"
+
+#include "ext-include-common.h"
+#include "ext-include-binary.h"
+#include "ext-include-variables.h"
+
+/*
+ * Variable import-export
+ */
+
+struct sieve_variable *ext_include_variable_import_global
+(struct sieve_validator *valdtr, struct sieve_command *cmd,
+	const char *variable)
+{
+	const struct sieve_extension *this_ext = cmd->ext;
+	struct sieve_ast *ast = cmd->ast_node->ast;
+	struct ext_include_ast_context *ctx =
+		ext_include_get_ast_context(this_ext, ast);
+	struct ext_include_context *ectx = ext_include_get_context(this_ext);
+	struct sieve_variable_scope *local_scope;
+	struct sieve_variable_scope *global_scope = ctx->global_vars;
+	struct sieve_variable *global_var = NULL, *local_var;
+
+	/* Sanity safeguard */
+	i_assert ( ctx->global_vars != NULL );
+
+	if ( !sieve_variable_identifier_is_valid(variable) ) {
+		sieve_command_validate_error(valdtr, cmd,
+			"invalid variable identifier '%s'", str_sanitize(variable,80));
+		return NULL;
+	}
+
+	/* Get/Declare the variable in the global scope */
+	global_var = sieve_variable_scope_declare(global_scope, variable);
+
+	/* Check whether scope is over its size limit */
+	if ( global_var == NULL ) {
+		sieve_command_validate_error(valdtr, cmd,
+			"declaration of new global variable '%s' exceeds the limit "
+			"(max variables: %u)", variable,
+			sieve_variables_get_max_scope_size(ectx->var_ext));
+		return NULL;
+	}
+
+	/* Import the global variable into the local script scope */
+	local_scope = sieve_ext_variables_get_local_scope(ectx->var_ext, valdtr);
+
+	local_var = sieve_variable_scope_get_variable(local_scope, variable);
+	if ( local_var != NULL && local_var->ext != this_ext ) {
+		/* FIXME: indicate location of conflicting set statement */
+		sieve_command_validate_error(valdtr, cmd,
+			"declaration of new global variable '%s' conflicts with earlier local "
+			"use", variable);
+		return NULL;
+	}
+
+	return sieve_variable_scope_import(local_scope, global_var);
+}
+
+/*
+ * Binary symbol table
+ */
+
+bool ext_include_variables_save
+(struct sieve_binary_block *sblock,
+	struct sieve_variable_scope_binary *global_vars,
+	enum sieve_error *error_r ATTR_UNUSED)
+{
+	struct sieve_variable_scope *global_scope =
+		sieve_variable_scope_binary_get(global_vars);
+	unsigned int count = sieve_variable_scope_size(global_scope);
+	sieve_size_t jump;
+
+	sieve_binary_emit_unsigned(sblock, count);
+
+	jump = sieve_binary_emit_offset(sblock, 0);
+
+	if ( count > 0 ) {
+		unsigned int size, i;
+		struct sieve_variable *const *vars =
+			sieve_variable_scope_get_variables(global_scope, &size);
+
+		for ( i = 0; i < size; i++ ) {
+			sieve_binary_emit_cstring(sblock, vars[i]->identifier);
+		}
+	}
+
+	sieve_binary_resolve_offset(sblock, jump);
+
+	return TRUE;
+}
+
+bool ext_include_variables_load
+(const struct sieve_extension *this_ext, struct sieve_binary_block *sblock,
+	sieve_size_t *offset, struct sieve_variable_scope_binary **global_vars_r)
+{
+	struct ext_include_context *ectx =
+		ext_include_get_context(this_ext);
+
+	/* Sanity assert */
+	i_assert( *global_vars_r == NULL );
+
+	*global_vars_r = sieve_variable_scope_binary_read
+		(this_ext->svinst, ectx->var_ext, this_ext, sblock, offset);
+
+	return ( *global_vars_r != NULL );
+}
+
+bool ext_include_variables_dump
+(struct sieve_dumptime_env *denv,
+	struct sieve_variable_scope_binary *global_vars)
+{
+	struct sieve_variable_scope *global_scope =
+		sieve_variable_scope_binary_get(global_vars);
+	unsigned int size;
+	struct sieve_variable *const *vars;
+
+	i_assert(global_scope != NULL);
+
+	vars = sieve_variable_scope_get_variables(global_scope, &size);
+
+	if ( size > 0 ) {
+		unsigned int i;
+
+		sieve_binary_dump_sectionf(denv, "Global variables");
+
+		for ( i = 0; i < size; i++ ) {
+			sieve_binary_dumpf(denv, "%3d: '%s' \n", i, vars[i]->identifier);
+		}
+	}
+
+	return TRUE;
+}
+
+/*
+ * Global variables namespace
+ */
+
+bool vnspc_global_variables_validate
+	(struct sieve_validator *valdtr, const struct sieve_variables_namespace *nspc,
+		struct sieve_ast_argument *arg, struct sieve_command *cmd,
+		ARRAY_TYPE(sieve_variable_name) *var_name, void **var_data,
+		bool assignment);
+bool vnspc_global_variables_generate
+	(const struct sieve_codegen_env *cgenv,
+		const struct sieve_variables_namespace *nspc,
+		struct sieve_ast_argument *arg, struct sieve_command *cmd, void *var_data);
+
+static const struct sieve_variables_namespace_def
+global_variables_namespace = {
+	SIEVE_OBJECT("global", NULL, 0),
+	.validate = vnspc_global_variables_validate,
+	.generate = vnspc_global_variables_generate
+};
+
+bool vnspc_global_variables_validate
+(struct sieve_validator *valdtr,
+	const struct sieve_variables_namespace *nspc, struct sieve_ast_argument *arg,
+	struct sieve_command *cmd ATTR_UNUSED,
+	ARRAY_TYPE(sieve_variable_name) *var_name, void **var_data,
+	bool assignment ATTR_UNUSED)
+{
+	const struct sieve_extension *this_ext = SIEVE_OBJECT_EXTENSION(nspc);
+	struct sieve_ast *ast = arg->ast;
+	struct ext_include_context *ectx =
+		ext_include_get_context(this_ext);
+	struct ext_include_ast_context *ctx =
+		ext_include_get_ast_context(this_ext, ast);
+	struct sieve_variable *var = NULL;
+	const struct sieve_variable_name *name_element;
+	const char *variable;
+
+	/* Sanity safeguard */
+	i_assert ( ctx->global_vars != NULL );
+
+	/* Check variable name */
+
+	if ( array_count(var_name) != 2 ) {
+		sieve_argument_validate_error(valdtr, arg,
+			"invalid variable name within global namespace: "
+			"encountered sub-namespace");
+		return FALSE;
+	}
+
+	name_element = array_idx(var_name, 1);
+	if ( name_element->num_variable >= 0 ) {
+		sieve_argument_validate_error(valdtr, arg,
+			"invalid variable name within global namespace: "
+			"encountered numeric variable name");
+		return FALSE;
+	}
+
+	variable = str_c(name_element->identifier);
+
+	/* Get/Declare the variable in the global scope */
+
+	var = sieve_variable_scope_declare(ctx->global_vars, variable);
+
+	if ( var == NULL ) {
+		sieve_argument_validate_error(valdtr, arg,
+			"(implicit) declaration of new global variable '%s' exceeds the limit "
+			"(max variables: %u)", variable,
+			sieve_variables_get_max_scope_size(ectx->var_ext));
+		return FALSE;
+	}
+
+	*var_data = (void *) var;
+
+	return TRUE;
+}
+
+bool vnspc_global_variables_generate
+(const struct sieve_codegen_env *cgenv,
+	const struct sieve_variables_namespace *nspc,
+	struct sieve_ast_argument *arg ATTR_UNUSED,
+	struct sieve_command *cmd ATTR_UNUSED, void *var_data)
+{
+	const struct sieve_extension *this_ext = SIEVE_OBJECT_EXTENSION(nspc);
+	struct ext_include_context *ectx = ext_include_get_context(this_ext);
+	struct sieve_variable *var = (struct sieve_variable *) var_data;
+
+	sieve_variables_opr_variable_emit(cgenv->sblock, ectx->var_ext, var);
+
+	return TRUE;
+}
+
+void ext_include_variables_global_namespace_init
+(const struct sieve_extension *this_ext, struct sieve_validator *valdtr)
+{
+	struct ext_include_context *ectx = ext_include_get_context(this_ext);
+
+	sieve_variables_namespace_register
+		(ectx->var_ext, valdtr, this_ext, &global_variables_namespace);
+}
+
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/include/ext-include-variables.h b/pigeonhole/src/lib-sieve/plugins/include/ext-include-variables.h
new file mode 100644
index 0000000..d5927b2
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/include/ext-include-variables.h
@@ -0,0 +1,41 @@
+#ifndef EXT_INCLUDE_VARIABLES_H
+#define EXT_INCLUDE_VARIABLES_H
+
+#include "sieve-common.h"
+
+#include "sieve-ext-variables.h"
+
+#include "ext-include-common.h"
+
+/*
+ * Variable import-export
+ */
+
+struct sieve_variable *ext_include_variable_import_global
+	(struct sieve_validator *valdtr, struct sieve_command *cmd,
+		const char *variable);
+
+/*
+ * Binary symbol table
+ */
+
+bool ext_include_variables_save
+	(struct sieve_binary_block *sblock,
+		struct sieve_variable_scope_binary *global_vars,
+		enum sieve_error *error_r);
+bool ext_include_variables_load
+	(const struct sieve_extension *this_ext, struct sieve_binary_block *sblock,
+		sieve_size_t *offset, struct sieve_variable_scope_binary **global_vars_r);
+bool ext_include_variables_dump
+	(struct sieve_dumptime_env *denv,
+		struct sieve_variable_scope_binary *global_vars);
+
+/*
+ * Validation
+ */
+
+void ext_include_variables_global_namespace_init
+	(const struct sieve_extension *this_ext, struct sieve_validator *valdtr);
+
+#endif
+
diff --git a/pigeonhole/src/lib-sieve/plugins/include/ext-include.c b/pigeonhole/src/lib-sieve/plugins/include/ext-include.c
new file mode 100644
index 0000000..0a38687
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/include/ext-include.c
@@ -0,0 +1,121 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension include
+ * -----------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 6609
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+/* FIXME: Current include implementation does not allow for parts of the script
+ * to be located in external binaries; all included scripts are recompiled and
+ * the resulting byte code is imported into the main binary in separate blocks.
+ */
+
+#include "lib.h"
+
+#include "sieve-common.h"
+
+#include "sieve-extensions.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-binary.h"
+#include "sieve-dump.h"
+
+#include "sieve-ext-variables.h"
+
+#include "ext-include-common.h"
+#include "ext-include-binary.h"
+#include "ext-include-variables.h"
+
+/*
+ * Operations
+ */
+
+static const struct sieve_operation_def *ext_include_operations[] = {
+	&include_operation,
+	&return_operation,
+	&global_operation
+};
+
+/*
+ * Extension
+ */
+
+/* Forward declaration */
+
+static bool ext_include_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *validator);
+static bool ext_include_generator_load
+	(const struct sieve_extension *ext, const struct sieve_codegen_env *cgenv);
+static bool ext_include_interpreter_load
+	(const struct sieve_extension *ext, const struct sieve_runtime_env *renv,
+		sieve_size_t *address);
+static bool ext_include_binary_load
+	(const struct sieve_extension *ext, struct sieve_binary *binary);
+
+/* Extension objects */
+
+const struct sieve_extension_def include_extension = {
+	.name = "include",
+	.version = 1,
+
+	.load = ext_include_load,
+	.unload = ext_include_unload,
+	.validator_load = ext_include_validator_load,
+	.generator_load = ext_include_generator_load,
+	.interpreter_load = ext_include_interpreter_load,
+	.binary_load = ext_include_binary_load,
+	.binary_dump = ext_include_binary_dump,
+	.code_dump = ext_include_code_dump,
+
+	SIEVE_EXT_DEFINE_OPERATIONS(ext_include_operations)
+};
+
+static bool ext_include_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	/* Register new commands */
+	sieve_validator_register_command(valdtr, ext, &cmd_include);
+	sieve_validator_register_command(valdtr, ext, &cmd_return);
+	sieve_validator_register_command(valdtr, ext, &cmd_global);
+
+	/* DEPRICATED */
+	sieve_validator_register_command(valdtr, ext, &cmd_import);
+	sieve_validator_register_command(valdtr, ext, &cmd_export);
+
+	/* Initialize global variables namespace */
+	ext_include_variables_global_namespace_init(ext, valdtr);
+
+	return TRUE;
+}
+
+static bool ext_include_generator_load
+(const struct sieve_extension *ext, const struct sieve_codegen_env *cgenv)
+{
+	ext_include_register_generator_context(ext, cgenv);
+
+	return TRUE;
+}
+
+static bool ext_include_interpreter_load
+(const struct sieve_extension *ext, const struct sieve_runtime_env *renv,
+	sieve_size_t *address ATTR_UNUSED)
+{
+	ext_include_interpreter_context_init(ext, renv->interp);
+
+	return TRUE;
+}
+
+static bool ext_include_binary_load
+(const struct sieve_extension *ext, struct sieve_binary *sbin)
+{
+	(void)ext_include_binary_get_context(ext, sbin);
+
+	return TRUE;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/index/Makefile.am b/pigeonhole/src/lib-sieve/plugins/index/Makefile.am
new file mode 100644
index 0000000..434ca1c
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/index/Makefile.am
@@ -0,0 +1,13 @@
+noinst_LTLIBRARIES = libsieve_ext_index.la
+
+AM_CPPFLAGS = \
+	-I$(srcdir)/../.. \
+	$(LIBDOVECOT_INCLUDE)
+
+libsieve_ext_index_la_SOURCES = \
+	ext-index-common.c \
+	ext-index.c \
+	tag-index.c
+
+noinst_HEADERS = \
+	ext-index-common.h
diff --git a/pigeonhole/src/lib-sieve/plugins/index/Makefile.in b/pigeonhole/src/lib-sieve/plugins/index/Makefile.in
new file mode 100644
index 0000000..852316c
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/index/Makefile.in
@@ -0,0 +1,688 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
+              "target option '$${target_option-}' specified" >&2; \
+         exit 1;; \
+  esac; \
+  has_opt=no; \
+  sane_makeflags=$$MAKEFLAGS; \
+  if $(am__is_gnu_make); then \
+    sane_makeflags=$$MFLAGS; \
+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
+        bs=\\; \
+        sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \
+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+  }; \
+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
+    case $$flg in \
+      *=*|--*) continue;; \
+        -*I) strip_trailopt 'I'; skip_next=yes;; \
+      -*I?*) strip_trailopt 'I';; \
+        -*O) strip_trailopt 'O'; skip_next=yes;; \
+      -*O?*) strip_trailopt 'O';; \
+        -*l) strip_trailopt 'l'; skip_next=yes;; \
+      -*l?*) strip_trailopt 'l';; \
+      -[dEDm]) skip_next=yes;; \
+      -[JT]) skip_next=yes;; \
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+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(LTLIBRARIES) $(HEADERS)
+installdirs:
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/ext-index-common.Plo
+	-rm -f ./$(DEPDIR)/ext-index.Plo
+	-rm -f ./$(DEPDIR)/tag-index.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/ext-index-common.Plo
+	-rm -f ./$(DEPDIR)/ext-index.Plo
+	-rm -f ./$(DEPDIR)/tag-index.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/index/ext-index-common.c b/pigeonhole/src/lib-sieve/plugins/index/ext-index-common.c
new file mode 100644
index 0000000..26fb706
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/index/ext-index-common.c
@@ -0,0 +1,15 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "utc-offset.h"
+#include "str.h"
+
+#include "sieve-common.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-interpreter.h"
+#include "sieve-message.h"
+
+#include "ext-index-common.h"
+
diff --git a/pigeonhole/src/lib-sieve/plugins/index/ext-index-common.h b/pigeonhole/src/lib-sieve/plugins/index/ext-index-common.h
new file mode 100644
index 0000000..7ce3244
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/index/ext-index-common.h
@@ -0,0 +1,29 @@
+#ifndef EXT_INDEX_COMMON_H
+#define EXT_INDEX_COMMON_H
+
+#include "sieve-common.h"
+
+#include <time.h>
+
+#define SIEVE_EXT_INDEX_HDR_OVERRIDE_SEQUENCE 100
+
+/*
+ * Tagged arguments
+ */
+
+extern const struct sieve_argument_def index_tag;
+extern const struct sieve_argument_def last_tag;
+
+/*
+ * Operands
+ */
+
+extern const struct sieve_operand_def index_operand;
+
+/*
+ * Extension
+ */
+
+extern const struct sieve_extension_def index_extension;
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/index/ext-index.c b/pigeonhole/src/lib-sieve/plugins/index/ext-index.c
new file mode 100644
index 0000000..33e7771
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/index/ext-index.c
@@ -0,0 +1,69 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension index
+ * ------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 5260
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "lib.h"
+#include "array.h"
+
+#include "sieve-common.h"
+#include "sieve-message.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-binary.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "ext-index-common.h"
+
+/*
+ * Extension
+ */
+
+static bool ext_index_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *validator);
+
+const struct sieve_extension_def index_extension = {
+	.name = "index",
+	.validator_load = ext_index_validator_load,
+	SIEVE_EXT_DEFINE_OPERAND(index_operand)
+};
+
+static bool ext_index_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	/* Register :index and :last tags with header, address and date test commands
+	 * and we don't care whether these command are registered or even whether
+	 * these will be registered at all. The validator handles either situation
+	 * gracefully.
+	 */
+	sieve_validator_register_external_tag
+		(valdtr, "header", ext, &index_tag, SIEVE_OPT_MESSAGE_OVERRIDE);
+	sieve_validator_register_external_tag
+		(valdtr, "header", ext, &last_tag, 0);
+
+	sieve_validator_register_external_tag
+		(valdtr, "address", ext, &index_tag, SIEVE_OPT_MESSAGE_OVERRIDE);
+	sieve_validator_register_external_tag
+		(valdtr, "address", ext, &last_tag, 0);
+
+	sieve_validator_register_external_tag
+		(valdtr, "date", ext, &index_tag, SIEVE_OPT_MESSAGE_OVERRIDE);
+	sieve_validator_register_external_tag
+		(valdtr, "date", ext, &last_tag, 0);
+
+	return TRUE;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/index/tag-index.c b/pigeonhole/src/lib-sieve/plugins/index/tag-index.c
new file mode 100644
index 0000000..d8938a5
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/index/tag-index.c
@@ -0,0 +1,278 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "mail-storage.h"
+#include "mail-namespace.h"
+
+#include "sieve-common.h"
+#include "sieve-stringlist.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-binary.h"
+#include "sieve-code.h"
+#include "sieve-message.h"
+#include "sieve-result.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+
+#include "ext-index-common.h"
+
+/*
+ * Tagged argument
+ */
+
+static bool
+tag_index_validate(struct sieve_validator *valdtr,
+		   struct sieve_ast_argument **arg, struct sieve_command *cmd);
+static bool
+tag_index_generate(const struct sieve_codegen_env *cgenv,
+		   struct sieve_ast_argument *arg,
+		   struct sieve_command *context);
+
+const struct sieve_argument_def index_tag = {
+	.identifier = "index",
+	.validate = tag_index_validate,
+	.generate = tag_index_generate
+};
+
+static bool
+tag_last_validate(struct sieve_validator *valdtr,
+		  struct sieve_ast_argument **arg, struct sieve_command *cmd);
+
+const struct sieve_argument_def last_tag = {
+	.identifier = "last",
+	.validate = tag_last_validate,
+};
+
+/*
+ * Header override
+ */
+
+static bool
+svmo_index_dump_context(const struct sieve_message_override *svmo,
+			const struct sieve_dumptime_env *denv,
+			sieve_size_t *address);
+static int
+svmo_index_read_context(const struct sieve_message_override *svmo,
+			const struct sieve_runtime_env *renv,
+			sieve_size_t *address, void **ho_context);
+static int
+svmo_index_header_override(const struct sieve_message_override *svmo,
+			   const struct sieve_runtime_env *renv,
+			   bool mime_decode, struct sieve_stringlist **headers);
+
+const struct sieve_message_override_def index_header_override = {
+	SIEVE_OBJECT("index", &index_operand, 0),
+	.sequence = SIEVE_EXT_INDEX_HDR_OVERRIDE_SEQUENCE,
+	.dump_context = svmo_index_dump_context,
+	.read_context = svmo_index_read_context,
+	.header_override = svmo_index_header_override
+};
+
+/*
+ * Operand
+ */
+
+static const struct sieve_extension_objects ext_header_overrides =
+	SIEVE_EXT_DEFINE_MESSAGE_OVERRIDE(index_header_override);
+
+const struct sieve_operand_def index_operand = {
+	.name = "index operand",
+	.ext_def = &index_extension,
+	.class = &sieve_message_override_operand_class,
+	.interface = &ext_header_overrides
+};
+
+/*
+ * Tag data
+ */
+
+struct tag_index_data {
+	sieve_number_t fieldno;
+	bool last:1;
+};
+
+/*
+ * Tag validation
+ */
+
+static bool
+tag_index_validate(struct sieve_validator *valdtr ATTR_UNUSED,
+		   struct sieve_ast_argument **arg, struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+	struct tag_index_data *data;
+
+	/* Skip the tag itself */
+	*arg = sieve_ast_argument_next(*arg);
+
+	/* Check syntax:
+	 *   ":index" <fieldno: number>
+	 */
+	if (!sieve_validate_tag_parameter(valdtr, cmd, tag, *arg, NULL, 0,
+					  SAAT_NUMBER, FALSE))
+		return FALSE;
+
+	if (tag->argument->data == NULL) {
+		data = p_new(sieve_command_pool(cmd), struct tag_index_data, 1);
+		tag->argument->data = (void *)data;
+	} else {
+		data = (struct tag_index_data *)tag->argument->data;
+	}
+
+	data->fieldno = sieve_ast_argument_number(*arg);
+	if (data->fieldno == 0) {
+		sieve_argument_validate_error(valdtr, *arg,
+			"the :index tag for the %s %s cannot be zero",
+			sieve_command_identifier(cmd),
+			sieve_command_type_name(cmd));
+		return FALSE;
+	}
+
+	/* Detach parameter */
+	*arg = sieve_ast_arguments_detach(*arg,1);
+	return TRUE;
+}
+
+static bool
+tag_last_validate(struct sieve_validator *valdtr ATTR_UNUSED,
+		  struct sieve_ast_argument **arg, struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *index_arg;
+	struct tag_index_data *data;
+
+	index_arg = sieve_command_find_argument(cmd, &index_tag);
+	if (index_arg == NULL) {
+		sieve_argument_validate_error(
+			valdtr, *arg,
+			"the :last tag for the %s %s cannot be specified "
+			"without the :index tag",
+			sieve_command_identifier(cmd),
+			sieve_command_type_name(cmd));
+		return FALSE;
+	}
+
+	/* Set :last flag */
+	if (index_arg->argument->data == NULL) {
+		data = p_new(sieve_command_pool(cmd), struct tag_index_data, 1);
+		index_arg->argument->data = (void*)data;
+	} else {
+		data = (struct tag_index_data *)index_arg->argument->data;
+	}
+	data->last = TRUE;
+
+	/* Detach */
+	*arg = sieve_ast_arguments_detach(*arg, 1);
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool
+tag_index_generate(const struct sieve_codegen_env *cgenv,
+		   struct sieve_ast_argument *arg,
+		   struct sieve_command *cmd ATTR_UNUSED)
+{
+	struct tag_index_data *data =
+		(struct tag_index_data *)arg->argument->data;
+
+	if (sieve_ast_argument_type(arg) != SAAT_TAG)
+		return FALSE;
+
+	sieve_opr_message_override_emit(cgenv->sblock, arg->argument->ext,
+					&index_header_override);
+
+	(void)sieve_binary_emit_integer	(cgenv->sblock, data->fieldno);
+	(void)sieve_binary_emit_byte(cgenv->sblock, (data->last ? 1 : 0));
+	return TRUE;
+}
+
+/*
+ * Header override implementation
+ */
+
+/* Context data */
+
+struct svmo_index_context {
+	unsigned int fieldno;
+	bool last:1;
+};
+
+/* Context coding */
+
+static bool
+svmo_index_dump_context(const struct sieve_message_override *svmo ATTR_UNUSED,
+			const struct sieve_dumptime_env *denv,
+			sieve_size_t *address)
+{
+	sieve_number_t fieldno = 0;
+	unsigned int last;
+
+	if (!sieve_binary_read_integer(denv->sblock, address, &fieldno) ||
+	    fieldno == 0)
+		return FALSE;
+
+	sieve_code_dumpf(denv, "fieldno: %llu", (unsigned long long) fieldno);
+
+	if (!sieve_binary_read_byte(denv->sblock, address, &last))
+		return FALSE;
+
+	if (last > 0)
+		sieve_code_dumpf(denv, "last");
+	return TRUE;
+}
+
+static int
+svmo_index_read_context(const struct sieve_message_override *svmo ATTR_UNUSED,
+			const struct sieve_runtime_env *renv,
+			sieve_size_t *address, void **ho_context)
+{
+	pool_t pool = sieve_result_pool(renv->result);
+	struct svmo_index_context *ctx;
+	sieve_number_t fieldno;
+	unsigned int last = 0;
+
+	if (!sieve_binary_read_integer(renv->sblock, address, &fieldno)) {
+		sieve_runtime_trace_error(renv, "fieldno: invalid number");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+	if (fieldno == 0) {
+		sieve_runtime_trace_error(renv, "fieldno: index is zero");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+	if (!sieve_binary_read_byte(renv->sblock, address, &last)) {
+		sieve_runtime_trace_error(renv, "last: invalid byte");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	ctx = p_new(pool, struct svmo_index_context, 1);
+	ctx->fieldno = fieldno;
+	ctx->last = (last == 0 ? FALSE : TRUE);
+
+	*ho_context = (void *) ctx;
+	return SIEVE_EXEC_OK;
+}
+
+/* Override */
+
+static int
+svmo_index_header_override(const struct sieve_message_override *svmo,
+			   const struct sieve_runtime_env *renv,
+			   bool mime_decode ATTR_UNUSED,
+			   struct sieve_stringlist **headers)
+{
+	struct svmo_index_context *ctx =
+		(struct svmo_index_context *)svmo->context;
+
+	sieve_runtime_trace(
+		renv, SIEVE_TRLVL_MATCHING,
+		"header index override: only returning index %d%s",
+		ctx->fieldno, (ctx->last ? " (from last)" : ""));
+
+	*headers = sieve_index_stringlist_create(
+		renv, *headers, (int)ctx->fieldno * (ctx->last ? -1 : 1));
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/mailbox/Makefile.am b/pigeonhole/src/lib-sieve/plugins/mailbox/Makefile.am
new file mode 100644
index 0000000..b627735
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/mailbox/Makefile.am
@@ -0,0 +1,26 @@
+noinst_LTLIBRARIES = libsieve_ext_mailbox.la
+
+AM_CPPFLAGS = \
+	-I$(srcdir)/../.. \
+	$(LIBDOVECOT_INCLUDE)
+
+tags = \
+	tag-mailbox-create.c
+
+tests = \
+	tst-mailboxexists.c
+
+libsieve_ext_mailbox_la_SOURCES = \
+	$(tags) \
+	$(tests) \
+	ext-mailbox.c
+
+public_headers = \
+	sieve-ext-mailbox.h
+
+headers = \
+	ext-mailbox-common.h
+
+pkginc_libdir=$(dovecot_pkgincludedir)/sieve
+pkginc_lib_HEADERS = $(public_headers)
+noinst_HEADERS = $(headers)
diff --git a/pigeonhole/src/lib-sieve/plugins/mailbox/Makefile.in b/pigeonhole/src/lib-sieve/plugins/mailbox/Makefile.in
new file mode 100644
index 0000000..6d5ed09
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/mailbox/Makefile.in
@@ -0,0 +1,757 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
+              "target option '$${target_option-}' specified" >&2; \
+         exit 1;; \
+  esac; \
+  has_opt=no; \
+  sane_makeflags=$$MAKEFLAGS; \
+  if $(am__is_gnu_make); then \
+    sane_makeflags=$$MFLAGS; \
+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
+        bs=\\; \
+        sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \
+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+  }; \
+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
+    case $$flg in \
+      *=*|--*) continue;; \
+        -*I) strip_trailopt 'I'; skip_next=yes;; \
+      -*I?*) strip_trailopt 'I';; \
+        -*O) strip_trailopt 'O'; skip_next=yes;; \
+      -*O?*) strip_trailopt 'O';; \
+        -*l) strip_trailopt 'l'; skip_next=yes;; \
+      -*l?*) strip_trailopt 'l';; \
+      -[dEDm]) skip_next=yes;; \
+      -[JT]) skip_next=yes;; \
+    esac; \
+    case $$flg in \
+      *$$target_option*) has_opt=yes; break;; \
+    esac; \
+  done; \
+  test $$has_opt = yes
+am__make_dryrun = (target_option=n; $(am__make_running_with_option))
+am__make_keepgoing = (target_option=k; $(am__make_running_with_option))
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+	done
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+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
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+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
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+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
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+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
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+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
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+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
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+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
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+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
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+	  fi; \
+	done
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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+	fi
+mostlyclean-generic:
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+
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+	@echo "it deletes files that may require special tools to rebuild."
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+		-rm -f ./$(DEPDIR)/ext-mailbox.Plo
+	-rm -f ./$(DEPDIR)/tag-mailbox-create.Plo
+	-rm -f ./$(DEPDIR)/tst-mailboxexists.Plo
+	-rm -f Makefile
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+		-rm -f ./$(DEPDIR)/ext-mailbox.Plo
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+	-rm -f ./$(DEPDIR)/tst-mailboxexists.Plo
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+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/mailbox/ext-mailbox-common.h b/pigeonhole/src/lib-sieve/plugins/mailbox/ext-mailbox-common.h
new file mode 100644
index 0000000..96cff39
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/mailbox/ext-mailbox-common.h
@@ -0,0 +1,39 @@
+#ifndef EXT_MAILBOX_COMMON_H
+#define EXT_MAILBOX_COMMON_H
+
+#include "sieve-common.h"
+
+#include "sieve-ext-mailbox.h"
+
+/*
+ * Tagged arguments
+ */
+
+extern const struct sieve_argument_def mailbox_create_tag;
+
+/*
+ * Commands
+ */
+
+extern const struct sieve_command_def mailboxexists_test;
+
+/*
+ * Operands
+ */
+
+extern const struct sieve_operand_def mailbox_create_operand;
+
+/*
+ * Operations
+ */
+
+extern const struct sieve_operation_def mailboxexists_operation;
+
+/*
+ * Extension
+ */
+
+extern const struct sieve_extension_def mailbox_extension;
+
+#endif
+
diff --git a/pigeonhole/src/lib-sieve/plugins/mailbox/ext-mailbox.c b/pigeonhole/src/lib-sieve/plugins/mailbox/ext-mailbox.c
new file mode 100644
index 0000000..a2dcd88
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/mailbox/ext-mailbox.c
@@ -0,0 +1,72 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension mailbox
+ * ------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 5490
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "sieve-common.h"
+
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-actions.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-result.h"
+
+#include "ext-mailbox-common.h"
+
+/*
+ * Tag registration
+ */
+
+void sieve_ext_mailbox_register_create_tag
+(struct sieve_validator *valdtr, const struct sieve_extension *mailbox_ext,
+	const char *command)
+{
+	if ( sieve_validator_extension_loaded(valdtr, mailbox_ext) ) {
+		sieve_validator_register_external_tag(valdtr, command,
+			mailbox_ext, &mailbox_create_tag, SIEVE_OPT_SIDE_EFFECT);
+	}
+}
+
+
+/*
+ * Extension
+ */
+
+static bool ext_mailbox_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+
+const struct sieve_extension_def mailbox_extension = {
+	.name = "mailbox",
+	.validator_load = ext_mailbox_validator_load,
+	SIEVE_EXT_DEFINE_OPERATION(mailboxexists_operation),
+	SIEVE_EXT_DEFINE_OPERAND(mailbox_create_operand)
+};
+
+static bool ext_mailbox_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	/* Register :create tag with fileinto command and we don't care whether this
+	 * command is registered or even whether it will be registered at all. The
+	 * validator handles either situation gracefully
+	 */
+	sieve_validator_register_external_tag
+		(valdtr, "fileinto", ext, &mailbox_create_tag, SIEVE_OPT_SIDE_EFFECT);
+
+	/* Register new test */
+	sieve_validator_register_command(valdtr, ext, &mailboxexists_test);
+
+	return TRUE;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/mailbox/sieve-ext-mailbox.h b/pigeonhole/src/lib-sieve/plugins/mailbox/sieve-ext-mailbox.h
new file mode 100644
index 0000000..f7fa4cf
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/mailbox/sieve-ext-mailbox.h
@@ -0,0 +1,21 @@
+#ifndef SIEVE_EXT_MAILBOX_H
+#define SIEVE_EXT_MAILBOX_H
+
+/* sieve_ext_mailbox_get_extension():
+ *   Get the extension struct for the mailbox extension.
+ */
+static inline const struct sieve_extension *sieve_ext_mailbox_get_extension
+(struct sieve_instance *svinst)
+{
+	return sieve_extension_get_by_name(svinst, "mailbox");
+}
+
+/* sieve_ext_mailbox_register_create_tag():
+ *   Register the :create tagged argument for a command other than fileinto and
+ *   redirect.
+ */
+void sieve_ext_mailbox_register_create_tag
+	(struct sieve_validator *valdtr, const struct sieve_extension *mailbox_ext,
+		const char *command);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/mailbox/tag-mailbox-create.c b/pigeonhole/src/lib-sieve/plugins/mailbox/tag-mailbox-create.c
new file mode 100644
index 0000000..f3c64cf
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/mailbox/tag-mailbox-create.c
@@ -0,0 +1,186 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "mail-storage.h"
+#include "mail-namespace.h"
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-actions.h"
+#include "sieve-code.h"
+#include "sieve-actions.h"
+#include "sieve-result.h"
+#include "sieve-generator.h"
+
+#include "ext-mailbox-common.h"
+
+/*
+ * Tagged argument
+ */
+
+static bool
+tag_mailbox_create_validate(struct sieve_validator *valdtr,
+			    struct sieve_ast_argument **arg,
+			    struct sieve_command *cmd);
+static bool
+tag_mailbox_create_generate(const struct sieve_codegen_env *cgenv,
+			    struct sieve_ast_argument *arg,
+			    struct sieve_command *context);
+
+const struct sieve_argument_def mailbox_create_tag = {
+	.identifier = "create",
+	.validate = tag_mailbox_create_validate,
+	.generate = tag_mailbox_create_generate
+};
+
+/*
+ * Side effect
+ */
+
+static void
+seff_mailbox_create_print(const struct sieve_side_effect *seffect,
+			  const struct sieve_action *action,
+			  const struct sieve_result_print_env *rpenv,
+			  bool *keep);
+static int
+seff_mailbox_create_pre_execute(const struct sieve_side_effect *seffect,
+				const struct sieve_action_exec_env *aenv,
+				void *tr_context,
+				void **se_tr_context ATTR_UNUSED);
+
+const struct sieve_side_effect_def mailbox_create_side_effect = {
+	SIEVE_OBJECT("create", &mailbox_create_operand, 0),
+	.precedence = 100,
+	.to_action = &act_store,
+	.print = seff_mailbox_create_print,
+	.pre_execute = seff_mailbox_create_pre_execute
+};
+
+/*
+ * Operand
+ */
+
+static const struct sieve_extension_objects ext_side_effects =
+	SIEVE_EXT_DEFINE_SIDE_EFFECT(mailbox_create_side_effect);
+
+const struct sieve_operand_def mailbox_create_operand = {
+	.name = "create operand",
+	.ext_def = &mailbox_extension,
+	.class = &sieve_side_effect_operand_class,
+	.interface = &ext_side_effects
+};
+
+/*
+ * Tag validation
+ */
+
+static bool
+tag_mailbox_create_validate(struct sieve_validator *valdtr ATTR_UNUSED,
+			    struct sieve_ast_argument **arg,
+			    struct sieve_command *cmd ATTR_UNUSED)
+{
+	*arg = sieve_ast_argument_next(*arg);
+
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool
+tag_mailbox_create_generate(const struct sieve_codegen_env *cgenv,
+			    struct sieve_ast_argument *arg,
+			    struct sieve_command *context ATTR_UNUSED)
+{
+	if (sieve_ast_argument_type(arg) != SAAT_TAG)
+		return FALSE;
+
+	sieve_opr_side_effect_emit(cgenv->sblock, arg->argument->ext,
+				   &mailbox_create_side_effect);
+	return TRUE;
+}
+
+/*
+ * Side effect implementation
+ */
+
+static void
+seff_mailbox_create_print(const struct sieve_side_effect *seffect ATTR_UNUSED,
+			  const struct sieve_action *action ATTR_UNUSED,
+			  const struct sieve_result_print_env *rpenv,
+			  bool *keep ATTR_UNUSED)
+{
+	sieve_result_seffect_printf(
+		rpenv, "create mailbox if it does not exist");
+}
+
+static int
+seff_mailbox_create_pre_execute(
+	const struct sieve_side_effect *seffect ATTR_UNUSED,
+	const struct sieve_action_exec_env *aenv, void *tr_context,
+	void **se_tr_context ATTR_UNUSED)
+{
+	struct act_store_transaction *trans = tr_context;
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct mailbox *box = trans->box;
+
+	/* Check whether creation is necessary */
+	if (box == NULL || trans->disabled)
+		return SIEVE_EXEC_OK;
+
+	eenv->exec_status->last_storage = mailbox_get_storage(box);
+
+	/* Open the mailbox (may already be open) */
+	if (trans->error_code == MAIL_ERROR_NONE) {
+		if (mailbox_open(box) < 0)
+			sieve_act_store_get_storage_error(aenv, trans);
+	}
+
+	/* Check whether creation has a chance of working */
+	switch (trans->error_code) {
+	case MAIL_ERROR_NONE:
+		return SIEVE_EXEC_OK;
+	case MAIL_ERROR_NOTFOUND:
+		break;
+	case MAIL_ERROR_TEMP:
+		return SIEVE_EXEC_TEMP_FAILURE;
+	default:
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	trans->error = NULL;
+	trans->error_code = MAIL_ERROR_NONE;
+
+	/* Create mailbox */
+	if (mailbox_create(box, NULL, FALSE) < 0) {
+		sieve_act_store_get_storage_error(aenv, trans);
+		if (trans->error_code == MAIL_ERROR_EXISTS) {
+			trans->error = NULL;
+			trans->error_code = MAIL_ERROR_NONE;
+		} else {
+			return (trans->error_code == MAIL_ERROR_TEMP ?
+				SIEVE_EXEC_TEMP_FAILURE : SIEVE_EXEC_FAILURE);
+		}
+	}
+
+	/* Subscribe to it if necessary */
+	if (eenv->scriptenv->mailbox_autosubscribe) {
+		(void)mailbox_list_set_subscribed(
+			mailbox_get_namespace(box)->list,
+			mailbox_get_name(box), TRUE);
+	}
+
+	/* Try opening again */
+	if (mailbox_open(box) < 0) {
+		/* Failed definitively */
+		sieve_act_store_get_storage_error(aenv, trans);
+		return (trans->error_code == MAIL_ERROR_TEMP ?
+			SIEVE_EXEC_TEMP_FAILURE : SIEVE_EXEC_FAILURE);
+	}
+	return SIEVE_EXEC_OK;
+}
+
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/mailbox/tst-mailboxexists.c b/pigeonhole/src/lib-sieve/plugins/mailbox/tst-mailboxexists.c
new file mode 100644
index 0000000..e0fd33d
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/mailbox/tst-mailboxexists.c
@@ -0,0 +1,284 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+#include "mail-storage.h"
+#include "mail-namespace.h"
+
+#include "sieve-common.h"
+#include "sieve-actions.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "ext-mailbox-common.h"
+
+/*
+ * Mailboxexists command
+ *
+ * Syntax:
+ *    mailboxexists <mailbox-names: string-list>
+ */
+
+static bool
+tst_mailboxexists_validate(struct sieve_validator *valdtr,
+			   struct sieve_command *tst);
+static bool
+tst_mailboxexists_generate(const struct sieve_codegen_env *cgenv,
+			   struct sieve_command *ctx);
+
+const struct sieve_command_def mailboxexists_test = {
+	.identifier = "mailboxexists",
+	.type = SCT_TEST,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = tst_mailboxexists_validate,
+	.generate = tst_mailboxexists_generate,
+};
+
+/*
+ * Mailboxexists operation
+ */
+
+static bool
+tst_mailboxexists_operation_dump(const struct sieve_dumptime_env *denv,
+				 sieve_size_t *address);
+static int
+tst_mailboxexists_operation_execute(const struct sieve_runtime_env *renv,
+				    sieve_size_t *address);
+
+const struct sieve_operation_def mailboxexists_operation = {
+	.mnemonic = "MAILBOXEXISTS",
+	.ext_def = &mailbox_extension,
+	.dump = tst_mailboxexists_operation_dump,
+	.execute = tst_mailboxexists_operation_execute,
+};
+
+/*
+ * Test validation
+ */
+
+struct _validate_context {
+	struct sieve_validator *valdtr;
+	struct sieve_command *tst;
+};
+
+static int
+tst_mailboxexists_mailbox_validate(void *context,
+				   struct sieve_ast_argument *arg)
+{
+	struct _validate_context *valctx =
+		(struct _validate_context *)context;
+
+	if (sieve_argument_is_string_literal(arg)) {
+		const char *mailbox = sieve_ast_argument_strc(arg), *error;
+
+		if (!sieve_mailbox_check_name(mailbox, &error)) {
+			sieve_argument_validate_warning(
+				valctx->valdtr, arg, "%s test: "
+				"invalid mailbox name `%s' specified: %s",
+				sieve_command_identifier(valctx->tst),
+				str_sanitize(mailbox, 256), error);
+		}
+	}
+
+	return 1;
+}
+
+static bool
+tst_mailboxexists_validate(struct sieve_validator *valdtr,
+			   struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+	struct sieve_ast_argument *aarg; 
+	struct _validate_context valctx;
+
+	if (!sieve_validate_positional_argument(
+		valdtr, tst, arg, "mailbox-names", 1, SAAT_STRING_LIST))
+		return FALSE;
+
+	if (!sieve_validator_argument_activate(valdtr, tst, arg, FALSE))
+		return FALSE;
+
+	aarg = arg;
+	i_zero(&valctx);
+	valctx.valdtr = valdtr;
+	valctx.tst = tst;
+
+	return (sieve_ast_stringlist_map(
+		&aarg, (void*)&valctx,
+		tst_mailboxexists_mailbox_validate) >= 0);
+}
+
+/*
+ * Test generation
+ */
+
+static bool
+tst_mailboxexists_generate(const struct sieve_codegen_env *cgenv,
+			   struct sieve_command *tst)
+{
+	sieve_operation_emit(cgenv->sblock, tst->ext, &mailboxexists_operation);
+
+ 	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, tst, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+tst_mailboxexists_operation_dump(const struct sieve_dumptime_env *denv,
+				 sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "MAILBOXEXISTS");
+	sieve_code_descend(denv);
+
+	return sieve_opr_stringlist_dump(denv, address, "mailbox-names");
+}
+
+/*
+ * Code execution
+ */
+
+static int
+tst_mailboxexists_test_mailbox(const struct sieve_runtime_env *renv,
+			       const char *mailbox, bool trace,
+			       bool *all_exist_r)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	struct mailbox *box;
+	const char *error;
+
+	/* Check validity of mailbox name */
+	if (!sieve_mailbox_check_name(mailbox, &error)) {
+		sieve_runtime_warning(
+			renv, NULL, "mailboxexists test: "
+			"invalid mailbox name `%s' specified: %s",
+			str_sanitize(mailbox, 256), error);
+		*all_exist_r = FALSE;
+		return SIEVE_EXEC_OK;
+	}
+
+	/* Open the box */
+	box = mailbox_alloc_for_user(eenv->scriptenv->user,
+				     mailbox,
+				     MAILBOX_FLAG_POST_SESSION);
+
+	if (mailbox_open(box) < 0) {
+		if (trace) {
+			sieve_runtime_trace(
+				renv, 0,
+				"mailbox `%s' cannot be opened",
+				str_sanitize(mailbox, 80));
+		}
+		mailbox_free(&box);
+		*all_exist_r = FALSE;
+		return SIEVE_EXEC_OK;
+	}
+
+	/* Also fail when it is readonly */
+	if (mailbox_is_readonly(box)) {
+		if (trace) {
+			sieve_runtime_trace(
+				renv, 0,
+				"mailbox `%s' is read-only",
+				str_sanitize(mailbox, 80));
+		}
+		mailbox_free(&box);
+		*all_exist_r = FALSE;
+		return SIEVE_EXEC_OK;
+	}
+
+	/* FIXME: check acl for 'p' or 'i' ACL permissions as
+	   required by RFC */
+
+	if (trace) {
+		sieve_runtime_trace(
+			renv, 0, "mailbox `%s' exists",
+			str_sanitize(mailbox, 80));
+	}
+
+	/* Close mailbox */
+	mailbox_free(&box);
+	return SIEVE_EXEC_OK;
+}
+
+static int
+tst_mailboxexists_operation_execute(const struct sieve_runtime_env *renv,
+				    sieve_size_t *address)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	struct sieve_stringlist *mailbox_names;
+	string_t *mailbox_item;
+	bool trace = FALSE;
+	bool all_exist = TRUE;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Read notify uris */
+	ret = sieve_opr_stringlist_read(renv, address, "mailbox-names",
+					&mailbox_names);
+	if (ret <= 0)
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_TESTS)) {
+		sieve_runtime_trace(renv, 0, "mailboxexists test");
+		sieve_runtime_trace_descend(renv);
+
+		trace = sieve_runtime_trace_active(renv, SIEVE_TRLVL_MATCHING);
+	}
+
+	if (eenv->scriptenv->user == NULL) {
+		sieve_runtime_trace(renv, 0, "no mail user; yield true");
+		sieve_interpreter_set_test_result(renv->interp, TRUE);
+		return SIEVE_EXEC_OK;
+	}
+
+	mailbox_item = NULL;
+	while (all_exist &&
+	       (ret = sieve_stringlist_next_item(mailbox_names,
+						 &mailbox_item)) > 0) {
+		const char *mailbox = str_c(mailbox_item);
+
+		ret = tst_mailboxexists_test_mailbox(renv, mailbox,
+						     trace, &all_exist);
+		if (ret <= 0)
+			return ret;
+	}
+
+	if (ret < 0) {
+		sieve_runtime_trace_error(
+			renv, "invalid mailbox name item");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	if (trace) {
+		if (all_exist) {
+			sieve_runtime_trace(renv, 0,
+					    "all mailboxes are available");
+		} else {
+			sieve_runtime_trace(renv, 0,
+					    "some mailboxes are unavailable");
+		}
+	}
+
+	sieve_interpreter_set_test_result(renv->interp, all_exist);
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/metadata/Makefile.am b/pigeonhole/src/lib-sieve/plugins/metadata/Makefile.am
new file mode 100644
index 0000000..6d69ba8
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/metadata/Makefile.am
@@ -0,0 +1,24 @@
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+
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+
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+	-I$(srcdir)/../.. \
+	-I$(srcdir)/../variables \
+	$(LIBDOVECOT_INCLUDE) \
+	$(LIBDOVECOT_STORAGE_INCLUDE)
+
+tests = \
+	tst-metadata.c \
+	tst-metadataexists.c
+
+extensions = \
+	ext-metadata.c
+
+libsieve_ext_metadata_la_SOURCES = \
+	$(tests) \
+	$(extensions)
+
+noinst_HEADERS = \
+	ext-metadata-common.h
+
diff --git a/pigeonhole/src/lib-sieve/plugins/metadata/Makefile.in b/pigeonhole/src/lib-sieve/plugins/metadata/Makefile.in
new file mode 100644
index 0000000..0b95819
--- /dev/null
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+	tst-metadata.c \
+	tst-metadataexists.c
+
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+	ext-metadata.c
+
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+	$(tests) \
+	$(extensions)
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+	ext-metadata-common.h
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+	$(am__cd) $(top_srcdir) && \
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+	  *config.status*) \
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+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
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+	@list='$(noinst_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+libsieve_ext_metadata.la: $(libsieve_ext_metadata_la_OBJECTS) $(libsieve_ext_metadata_la_DEPENDENCIES) $(EXTRA_libsieve_ext_metadata_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(libsieve_ext_metadata_la_LINK)  $(libsieve_ext_metadata_la_OBJECTS) $(libsieve_ext_metadata_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
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+
+distclean-compile:
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+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-metadata.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/tst-metadata.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/tst-metadataexists.Plo@am__quote@ # am--include-marker
+
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+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
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+
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+.c.lo:
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+	-rm -f ./$(DEPDIR)/tst-metadataexists.Plo
+	-rm -f Makefile
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+	-rm -f Makefile
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+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/metadata/ext-metadata-common.h b/pigeonhole/src/lib-sieve/plugins/metadata/ext-metadata-common.h
new file mode 100644
index 0000000..a4b25a0
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/metadata/ext-metadata-common.h
@@ -0,0 +1,40 @@
+#ifndef EXT_METADATA_COMMON_H
+#define EXT_METADATA_COMMON_H
+
+#include "lib.h"
+#include "mail-storage.h"
+#include "imap-metadata.h"
+
+#include "sieve-common.h"
+
+/*
+ * Extension
+ */
+
+extern const struct sieve_extension_def mboxmetadata_extension;
+extern const struct sieve_extension_def servermetadata_extension;
+
+/*
+ * Commands
+ */
+
+extern const struct sieve_command_def metadata_test;
+extern const struct sieve_command_def servermetadata_test;
+extern const struct sieve_command_def metadataexists_test;
+extern const struct sieve_command_def servermetadataexists_test;
+
+/*
+ * Operations
+ */
+
+enum ext_metadata_opcode {
+	EXT_METADATA_OPERATION_METADATA,
+	EXT_METADATA_OPERATION_METADATAEXISTS
+};
+
+extern const struct sieve_operation_def metadata_operation;
+extern const struct sieve_operation_def servermetadata_operation;
+extern const struct sieve_operation_def metadataexists_operation;
+extern const struct sieve_operation_def servermetadataexists_operation;
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/metadata/ext-metadata.c b/pigeonhole/src/lib-sieve/plugins/metadata/ext-metadata.c
new file mode 100644
index 0000000..882116b
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/metadata/ext-metadata.c
@@ -0,0 +1,83 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-binary.h"
+
+#include "sieve-validator.h"
+#include "sieve-interpreter.h"
+
+#include "ext-metadata-common.h"
+
+/*
+ * Extension mboxmetadata
+ * -----------------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 5490; Section 3
+ * Implementation: skeleton
+ * Status: development
+ *
+ */
+
+const struct sieve_operation_def *mboxmetadata_operations[] = {
+	&metadata_operation,
+	&metadataexists_operation,
+};
+
+static bool ext_mboxmetadata_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+
+const struct sieve_extension_def mboxmetadata_extension = {
+	.name = "mboxmetadata",
+	.validator_load = ext_mboxmetadata_validator_load,
+	SIEVE_EXT_DEFINE_OPERATIONS(mboxmetadata_operations)
+};
+
+static bool ext_mboxmetadata_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	sieve_validator_register_command(valdtr, ext, &metadata_test);
+	sieve_validator_register_command(valdtr, ext, &metadataexists_test);
+
+	return TRUE;
+}
+
+/*
+ * Extension servermetadata
+ * -----------------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 5490; Section 4
+ * Implementation: skeleton
+ * Status: development
+ *
+ */
+
+const struct sieve_operation_def *servermetadata_operations[] = {
+	&servermetadata_operation,
+	&servermetadataexists_operation,
+};
+
+static bool ext_servermetadata_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+
+const struct sieve_extension_def servermetadata_extension = {
+	.name = "servermetadata",
+	.validator_load = ext_servermetadata_validator_load,
+	SIEVE_EXT_DEFINE_OPERATIONS(servermetadata_operations)
+};
+
+static bool ext_servermetadata_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	sieve_validator_register_command(valdtr, ext, &servermetadata_test);
+	sieve_validator_register_command(valdtr, ext, &servermetadataexists_test);
+
+	return TRUE;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/metadata/tst-metadata.c b/pigeonhole/src/lib-sieve/plugins/metadata/tst-metadata.c
new file mode 100644
index 0000000..2e14535
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/metadata/tst-metadata.c
@@ -0,0 +1,433 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+#include "istream.h"
+
+#include "sieve-common.h"
+#include "sieve-limits.h"
+#include "sieve-commands.h"
+#include "sieve-actions.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-match.h"
+
+#include "ext-metadata-common.h"
+
+#define TST_METADATA_MAX_MATCH_SIZE SIEVE_MAX_STRING_LEN
+
+/*
+ * Test definitions
+ */
+
+/* Forward declarations */
+
+static bool
+tst_metadata_registered(struct sieve_validator *valdtr,
+			const struct sieve_extension *ext,
+			struct sieve_command_registration *cmd_reg);
+static bool
+tst_metadata_validate(struct sieve_validator *valdtr,
+		      struct sieve_command *tst);
+static bool
+tst_metadata_generate(const struct sieve_codegen_env *cgenv,
+		      struct sieve_command *cmd);
+
+/* Metadata test
+ *
+ * Syntax:
+ *   metadata [MATCH-TYPE] [COMPARATOR]
+ *            <mailbox: string>
+ *            <annotation-name: string> <key-list: string-list>
+ */
+
+const struct sieve_command_def metadata_test = {
+	.identifier = "metadata",
+	.type = SCT_TEST,
+	.positional_args = 3,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = tst_metadata_registered,
+	.validate = tst_metadata_validate,
+	.generate = tst_metadata_generate,
+};
+
+/* Servermetadata test
+ *
+ * Syntax:
+ *   servermetadata [MATCH-TYPE] [COMPARATOR]
+ *            <annotation-name: string> <key-list: string-list>
+ */
+
+const struct sieve_command_def servermetadata_test = {
+	.identifier = "servermetadata",
+	.type = SCT_TEST,
+	.positional_args = 2,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = tst_metadata_registered,
+	.validate = tst_metadata_validate,
+	.generate = tst_metadata_generate,
+};
+
+/*
+ * Opcode definitions
+ */
+
+static bool
+tst_metadata_operation_dump(const struct sieve_dumptime_env *denv,
+			    sieve_size_t *address);
+static int
+tst_metadata_operation_execute(const struct sieve_runtime_env *renv,
+			       sieve_size_t *address);
+
+/* Metadata operation */
+
+const struct sieve_operation_def metadata_operation = {
+	.mnemonic = "METADATA",
+	.ext_def = &mboxmetadata_extension,
+	.code = EXT_METADATA_OPERATION_METADATA,
+	.dump = tst_metadata_operation_dump,
+	.execute = tst_metadata_operation_execute,
+};
+
+/* Servermetadata operation */
+
+const struct sieve_operation_def servermetadata_operation = {
+	.mnemonic = "SERVERMETADATA",
+	.ext_def = &servermetadata_extension,
+	.code = EXT_METADATA_OPERATION_METADATA,
+	.dump = tst_metadata_operation_dump,
+	.execute = tst_metadata_operation_execute,
+};
+
+/*
+ * Test registration
+ */
+
+static bool
+tst_metadata_registered(struct sieve_validator *valdtr,
+			const struct sieve_extension *ext ATTR_UNUSED,
+			struct sieve_command_registration *cmd_reg)
+{
+	/* The order of these is not significant */
+	sieve_comparators_link_tag(valdtr, cmd_reg,
+				   SIEVE_MATCH_OPT_COMPARATOR);
+	sieve_match_types_link_tags(valdtr, cmd_reg,
+				    SIEVE_MATCH_OPT_MATCH_TYPE);
+	return TRUE;
+}
+
+/*
+ * Test validation
+ */
+
+static bool
+tst_metadata_validate(struct sieve_validator *valdtr, struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+	const struct sieve_match_type mcht_default =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	const struct sieve_comparator cmp_default =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+	unsigned int arg_index = 1;
+	const char *error;
+
+	/* mailbox */
+	if (sieve_command_is(tst, metadata_test)) {
+		if (!sieve_validate_positional_argument(
+			valdtr, tst, arg, "mailbox", arg_index++,
+			SAAT_STRING))
+			return FALSE;
+
+		if (!sieve_validator_argument_activate(valdtr, tst, arg, FALSE))
+			return FALSE;
+
+		/* Check name validity when mailbox argument is not a variable
+		 */
+		if (sieve_argument_is_string_literal(arg)) {
+			const char *mailbox = sieve_ast_argument_strc(arg);
+			const char *error;
+
+			if (!sieve_mailbox_check_name(mailbox, &error)) {
+				sieve_argument_validate_warning(
+					valdtr, arg, "%s test: "
+					"invalid mailbox name `%s' specified: %s",
+					sieve_command_identifier(tst),
+					str_sanitize(mailbox, 256), error);
+			}
+		}
+		arg = sieve_ast_argument_next(arg);
+	}
+
+	/* annotation-name */
+	if (!sieve_validate_positional_argument(valdtr, tst, arg,
+						"annotation-name", arg_index++,
+						SAAT_STRING))
+		return FALSE;
+
+	if (!sieve_validator_argument_activate(valdtr, tst, arg, FALSE))
+		return FALSE;
+
+	if (sieve_argument_is_string_literal(arg)) {
+		string_t *aname = sieve_ast_argument_str(arg);
+
+		if (!imap_metadata_verify_entry_name(str_c(aname), &error)) {
+			sieve_argument_validate_warning(
+				valdtr, arg, "%s test: "
+				"specified annotation name `%s' is invalid: %s",
+				sieve_command_identifier(tst),
+				str_sanitize(str_c(aname), 256),
+				sieve_error_from_external(error));
+		}
+	}
+
+	arg = sieve_ast_argument_next(arg);
+
+	/* key-list */
+	if (!sieve_validate_positional_argument(valdtr, tst, arg,
+						"key-list", arg_index++,
+						SAAT_STRING_LIST))
+		return FALSE;
+
+	if (!sieve_validator_argument_activate(valdtr, tst, arg, FALSE))
+		return FALSE;
+
+	/* Validate the key argument to a specified match type */
+	return sieve_match_type_validate(valdtr, tst, arg,
+					 &mcht_default, &cmp_default);
+}
+
+/*
+ * Test generation
+ */
+
+static bool
+tst_metadata_generate(const struct sieve_codegen_env *cgenv,
+		      struct sieve_command *tst)
+{
+	if (sieve_command_is(tst, metadata_test)) {
+		sieve_operation_emit(cgenv->sblock, tst->ext,
+				     &metadata_operation);
+	} else if (sieve_command_is(tst, servermetadata_test)) {
+		sieve_operation_emit(cgenv->sblock, tst->ext,
+				     &servermetadata_operation);
+	} else {
+		i_unreached();
+	}
+
+ 	/* Generate arguments */
+	if (!sieve_generate_arguments(cgenv, tst, NULL))
+		return FALSE;
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+tst_metadata_operation_dump(const struct sieve_dumptime_env *denv,
+			    sieve_size_t *address)
+{
+	bool metadata = sieve_operation_is(denv->oprtn, metadata_operation);
+
+	if (metadata)
+		sieve_code_dumpf(denv, "METADATA");
+	else
+		sieve_code_dumpf(denv, "SERVERMETADATA");
+
+	sieve_code_descend(denv);
+
+	/* Handle any optional arguments */
+	if (sieve_match_opr_optional_dump(denv, address, NULL) != 0)
+ 		return FALSE;
+	if (metadata && !sieve_opr_string_dump(denv, address, "mailbox"))
+		return FALSE;
+
+	return (sieve_opr_string_dump(denv, address, "annotation-name") &&
+		sieve_opr_stringlist_dump(denv, address, "key list"));
+}
+
+/*
+ * Code execution
+ */
+
+static int
+tst_metadata_get_annotation(const struct sieve_runtime_env *renv,
+			    const char *mailbox, const char *aname,
+			    const char **annotation_r)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	struct mail_user *user = eenv->scriptenv->user;
+	struct mailbox *box;
+	struct imap_metadata_transaction *imtrans;
+	struct mail_attribute_value avalue;
+	int status, ret;
+
+	*annotation_r = NULL;
+
+	if (user == NULL)
+		return SIEVE_EXEC_OK;
+
+	if (mailbox != NULL) {
+		struct mail_namespace *ns;
+		ns = mail_namespace_find(user->namespaces, mailbox);
+		box = mailbox_alloc(ns->list, mailbox, 0);
+		imtrans = imap_metadata_transaction_begin(box);
+	} else {
+		box = NULL;
+		imtrans = imap_metadata_transaction_begin_server(user);
+	}
+
+	status = SIEVE_EXEC_OK;
+	ret = imap_metadata_get(imtrans, aname, &avalue);
+	if (ret < 0) {
+		enum mail_error error_code;
+		const char *error;
+
+		error = imap_metadata_transaction_get_last_error(
+			imtrans, &error_code);
+
+		sieve_runtime_error(
+			renv, NULL, "%s test: "
+			"failed to retrieve annotation `%s': %s%s",
+			(mailbox != NULL ? "metadata" : "servermetadata"),
+			str_sanitize(aname, 256),
+			sieve_error_from_external(error),
+			(error_code == MAIL_ERROR_TEMP ?
+			 " (temporary failure)" : ""));
+
+		status = (error_code == MAIL_ERROR_TEMP ?
+			  SIEVE_EXEC_TEMP_FAILURE : SIEVE_EXEC_FAILURE);
+
+	} else if (avalue.value != NULL) {
+		*annotation_r = avalue.value;
+	}
+	(void)imap_metadata_transaction_commit(&imtrans, NULL, NULL);
+	if (box != NULL)
+		mailbox_free(&box);
+	return status;
+}
+
+static int
+tst_metadata_operation_execute(const struct sieve_runtime_env *renv,
+			       sieve_size_t *address)
+{
+	bool metadata = sieve_operation_is(renv->oprtn, metadata_operation);
+	struct sieve_match_type mcht =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	struct sieve_comparator cmp =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+	string_t *mailbox, *aname;
+	struct sieve_stringlist *value_list, *key_list;
+	const char *annotation = NULL, *error;
+	int match, ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Handle match-type and comparator operands */
+	if (sieve_match_opr_optional_read(renv, address, NULL,
+					  &ret, &cmp, &mcht) < 0)
+		return ret;
+
+	/* Read mailbox */
+	if (metadata) {
+		ret = sieve_opr_string_read(renv, address, "mailbox", &mailbox);
+		if (ret <= 0)
+			return ret;
+	}
+
+	/* Read annotation-name */
+	ret = sieve_opr_string_read(renv, address, "annotation-name", &aname);
+	if (ret <= 0)
+		return ret;
+
+	/* Read key-list */
+	ret = sieve_opr_stringlist_read(renv, address, "key-list", &key_list);
+	if (ret <= 0)
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	if (metadata) {
+		sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+				    "metadata test");
+	} else {
+		sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+				    "servermetadata test");
+	}
+	sieve_runtime_trace_descend(renv);
+
+	if (!imap_metadata_verify_entry_name(str_c(aname), &error)) {
+		sieve_runtime_warning(
+			renv, NULL, "%s test: "
+			"specified annotation name `%s' is invalid: %s",
+			(metadata ? "metadata" : "servermetadata"),
+			str_sanitize(str_c(aname), 256),
+			sieve_error_from_external(error));
+		sieve_interpreter_set_test_result(renv->interp, FALSE);
+		return SIEVE_EXEC_OK;
+	}
+
+	if (metadata) {
+		if (!sieve_mailbox_check_name(str_c(mailbox), &error)) {
+			sieve_runtime_warning(
+				renv, NULL, "metadata test: "
+				"invalid mailbox name `%s' specified: %s",
+				str_sanitize(str_c(mailbox), 256), error);
+			sieve_interpreter_set_test_result(renv->interp, FALSE);
+			return SIEVE_EXEC_OK;
+		}
+
+		sieve_runtime_trace(
+			renv, SIEVE_TRLVL_TESTS,
+			"retrieving annotation `%s' from mailbox `%s'",
+			str_sanitize(str_c(aname), 256),
+			str_sanitize(str_c(mailbox), 80));
+	} else {
+		sieve_runtime_trace(
+			renv, SIEVE_TRLVL_TESTS,
+			"retrieving server annotation `%s'",
+			str_sanitize(str_c(aname), 256));
+	}
+
+	/* Get annotation */
+	ret = tst_metadata_get_annotation(renv,
+					  (metadata ? str_c(mailbox) : NULL),
+					  str_c(aname), &annotation);
+	if (ret == SIEVE_EXEC_OK) {
+		/* Perform match */
+		if (annotation != NULL) {
+			/* Create value stringlist */
+			value_list = sieve_single_stringlist_create_cstr(
+				renv, annotation, FALSE);
+
+			/* Perform match */
+			match = sieve_match(renv, &mcht, &cmp,
+					    value_list, key_list, &ret);
+			if (ret < 0)
+				return ret;
+		} else {
+			match = 0;
+		}
+	}
+
+	/* Set test result for subsequent conditional jump */
+	if (ret == SIEVE_EXEC_OK)
+		sieve_interpreter_set_test_result(renv->interp, match > 0);
+	return ret;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/metadata/tst-metadataexists.c b/pigeonhole/src/lib-sieve/plugins/metadata/tst-metadataexists.c
new file mode 100644
index 0000000..e11d692
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/metadata/tst-metadataexists.c
@@ -0,0 +1,431 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+#include "mail-storage.h"
+#include "mail-namespace.h"
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-actions.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "ext-metadata-common.h"
+
+/*
+ * Command definitions
+ */
+
+/* Forward declarations */
+
+static bool
+tst_metadataexists_validate(struct sieve_validator *valdtr,
+			    struct sieve_command *tst);
+static bool
+tst_metadataexists_generate(const struct sieve_codegen_env *cgenv,
+			    struct sieve_command *ctx);
+
+/* Metadataexists command
+ *
+ * Syntax:
+ *    metadataexists <mailbox: string> <annotation-names: string-list>
+ */
+
+static bool
+tst_metadataexists_validate(struct sieve_validator *valdtr,
+			    struct sieve_command *tst);
+static bool
+tst_metadataexists_generate(const struct sieve_codegen_env *cgenv,
+			    struct sieve_command *ctx);
+
+const struct sieve_command_def metadataexists_test = {
+	.identifier = "metadataexists",
+	.type = SCT_TEST,
+	.positional_args = 2,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = tst_metadataexists_validate,
+	.generate = tst_metadataexists_generate,
+};
+
+/* Servermetadataexists command
+ *
+ * Syntax:
+ *    servermetadataexists <annotation-names: string-list>
+ */
+
+const struct sieve_command_def servermetadataexists_test = {
+	.identifier = "servermetadataexists",
+	.type = SCT_TEST,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = tst_metadataexists_validate,
+	.generate = tst_metadataexists_generate,
+};
+
+/*
+ * Opcode definitions
+ */
+
+static bool
+tst_metadataexists_operation_dump(const struct sieve_dumptime_env *denv,
+				  sieve_size_t *address);
+static int
+tst_metadataexists_operation_execute(const struct sieve_runtime_env *renv,
+				     sieve_size_t *address);
+
+/* Metadata operation */
+
+const struct sieve_operation_def metadataexists_operation = {
+	.mnemonic = "METADATAEXISTS",
+	.ext_def = &mboxmetadata_extension,
+	.code = EXT_METADATA_OPERATION_METADATAEXISTS,
+	.dump = tst_metadataexists_operation_dump,
+	.execute = tst_metadataexists_operation_execute,
+};
+
+/* Mailboxexists operation */
+
+const struct sieve_operation_def servermetadataexists_operation = {
+	.mnemonic = "SERVERMETADATAEXISTS",
+	.ext_def = &servermetadata_extension,
+	.code = EXT_METADATA_OPERATION_METADATAEXISTS,
+	.dump = tst_metadataexists_operation_dump,
+	.execute = tst_metadataexists_operation_execute,
+};
+
+/*
+ * Test validation
+ */
+
+struct _validate_context {
+	struct sieve_validator *valdtr;
+	struct sieve_command *tst;
+};
+
+static int
+tst_metadataexists_annotation_validate(void *context,
+				       struct sieve_ast_argument *arg)
+{
+	struct _validate_context *valctx =
+		(struct _validate_context *)context;
+
+	if (sieve_argument_is_string_literal(arg)) {
+		const char *aname = sieve_ast_strlist_strc(arg);
+		const char *error;
+
+		if (!imap_metadata_verify_entry_name(aname, &error)) {
+			sieve_argument_validate_warning(
+				valctx->valdtr, arg, "%s test: "
+				"specified annotation name `%s' is invalid: %s",
+				sieve_command_identifier(valctx->tst),
+				str_sanitize(aname, 256),
+				sieve_error_from_external(error));
+		}
+	}
+	return 1; /* Can't check at compile time */
+}
+
+static bool
+tst_metadataexists_validate(struct sieve_validator *valdtr,
+			    struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+	struct sieve_ast_argument *aarg; 
+	struct _validate_context valctx;
+	unsigned int arg_index = 1;
+
+	if (sieve_command_is(tst, metadataexists_test)) {
+		if (!sieve_validate_positional_argument(valdtr, tst, arg,
+							"mailbox", arg_index++,
+							SAAT_STRING))
+			return FALSE;
+
+		if (!sieve_validator_argument_activate(valdtr, tst, arg, FALSE))
+			return FALSE;
+
+		/* Check name validity when mailbox argument is not a variable */
+		if (sieve_argument_is_string_literal(arg)) {
+			const char *mailbox = sieve_ast_argument_strc(arg);
+			const char *error;
+
+			if (!sieve_mailbox_check_name(mailbox, &error)) {
+				sieve_argument_validate_warning(
+					valdtr, arg, "%s test: "
+					"invalid mailbox name `%s' specified: %s",
+					sieve_command_identifier(tst),
+					str_sanitize(mailbox, 256), error);
+			}
+		}
+		arg = sieve_ast_argument_next(arg);
+	}
+
+	if (!sieve_validate_positional_argument(valdtr, tst, arg,
+						"annotation-names", arg_index++,
+						SAAT_STRING_LIST))
+		return FALSE;
+	if (!sieve_validator_argument_activate(valdtr, tst, arg, FALSE))
+		return FALSE;
+
+	aarg = arg;
+	i_zero(&valctx);
+	valctx.valdtr = valdtr;
+	valctx.tst = tst;
+
+	return (sieve_ast_stringlist_map(
+		&aarg, (void*)&valctx,
+		tst_metadataexists_annotation_validate) >= 0);
+}
+
+/*
+ * Test generation
+ */
+
+static bool
+tst_metadataexists_generate(const struct sieve_codegen_env *cgenv,
+			    struct sieve_command *tst)
+{
+	if (sieve_command_is(tst, metadataexists_test)) {
+		sieve_operation_emit(cgenv->sblock, tst->ext,
+				     &metadataexists_operation);
+	} else if (sieve_command_is(tst, servermetadataexists_test)) {
+		sieve_operation_emit(cgenv->sblock, tst->ext,
+				     &servermetadataexists_operation);
+	} else {
+		i_unreached();
+	}
+
+ 	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, tst, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+tst_metadataexists_operation_dump(const struct sieve_dumptime_env *denv,
+				  sieve_size_t *address)
+{
+	bool metadata = sieve_operation_is(denv->oprtn,
+					   metadataexists_operation);
+
+	if (metadata)
+		sieve_code_dumpf(denv, "METADATAEXISTS");
+	else
+		sieve_code_dumpf(denv, "SERVERMETADATAEXISTS");
+
+	sieve_code_descend(denv);
+
+	if (metadata && !sieve_opr_string_dump(denv, address, "mailbox"))
+		return FALSE;
+
+	return sieve_opr_stringlist_dump(denv, address, "annotation-names");
+}
+
+/*
+ * Code execution
+ */
+
+static int
+tst_metadataexists_check_annotation(const struct sieve_runtime_env *renv,
+				    struct imap_metadata_transaction *imtrans,
+				    const char *mailbox, const char *aname,
+				    bool *all_exist_r)
+{
+	struct mail_attribute_value avalue;
+	const char *error;
+	int ret;
+
+	if (!imap_metadata_verify_entry_name(aname, &error)) {
+		sieve_runtime_warning(
+			renv, NULL, "%s test: "
+			"specified annotation name `%s' is invalid: %s",
+			(mailbox != NULL ?
+			 "metadataexists" : "servermetadataexists"),
+			str_sanitize(aname, 256),
+			sieve_error_from_external(error));
+		*all_exist_r = FALSE;
+		return SIEVE_EXEC_OK;
+	}
+
+	ret = imap_metadata_get(imtrans, aname, &avalue);
+	if (ret < 0) {
+		enum mail_error error_code;
+		const char *error;
+
+		error = imap_metadata_transaction_get_last_error(
+			imtrans, &error_code);
+		sieve_runtime_error(
+			renv, NULL, "%s test: "
+			"failed to retrieve annotation `%s': %s%s",
+			(mailbox != NULL ?
+			 "metadataexists" : "servermetadataexists"),
+			str_sanitize(aname, 256),
+			sieve_error_from_external(error),
+			(error_code == MAIL_ERROR_TEMP ?
+			 " (temporary failure)" : ""));
+
+		*all_exist_r = FALSE;
+		return (error_code == MAIL_ERROR_TEMP ?
+			SIEVE_EXEC_TEMP_FAILURE : SIEVE_EXEC_FAILURE);
+	}
+	if (avalue.value == NULL && avalue.value_stream == NULL) {
+		sieve_runtime_trace(renv, 0,
+				    "annotation `%s': not found", aname);
+		*all_exist_r = FALSE;
+	}
+
+	sieve_runtime_trace(renv, 0, "annotation `%s': found", aname);
+	return SIEVE_EXEC_OK;
+}
+
+static int
+tst_metadataexists_check_annotations(const struct sieve_runtime_env *renv,
+				     const char *mailbox,
+				     struct sieve_stringlist *anames,
+				     bool *all_exist_r)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	struct mail_user *user = eenv->scriptenv->user;
+	struct mailbox *box = NULL;
+	struct imap_metadata_transaction *imtrans;
+	string_t *aname;
+	bool all_exist = TRUE;
+	int ret, sret, status;
+
+	*all_exist_r = FALSE;
+
+	if (user == NULL)
+		return SIEVE_EXEC_OK;
+
+	if (mailbox != NULL) {
+		struct mail_namespace *ns;
+		ns = mail_namespace_find(user->namespaces, mailbox);
+		box = mailbox_alloc(ns->list, mailbox, 0);
+		imtrans = imap_metadata_transaction_begin(box);
+	} else {
+		imtrans = imap_metadata_transaction_begin_server(user);
+	}
+
+	if (mailbox != NULL) {
+		sieve_runtime_trace(
+			renv, SIEVE_TRLVL_TESTS,
+			"checking annotations of mailbox `%s':",
+			str_sanitize(mailbox, 80));
+	} else {
+		sieve_runtime_trace(
+			renv, SIEVE_TRLVL_TESTS,
+			"checking server annotations");
+	}
+
+	aname = NULL;
+	status = SIEVE_EXEC_OK;
+	while (all_exist &&
+	       (sret = sieve_stringlist_next_item(anames, &aname)) > 0) {
+		ret = tst_metadataexists_check_annotation(
+			renv, imtrans, mailbox, str_c(aname), &all_exist);
+		if (ret <= 0) {
+			status = ret;
+			break;
+		}
+	}
+
+	if (sret < 0) {
+		sieve_runtime_trace_error(
+			renv, "invalid annotation name stringlist item");
+		status = SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	(void)imap_metadata_transaction_commit(&imtrans, NULL, NULL);
+	if (box != NULL)
+		mailbox_free(&box);
+
+	*all_exist_r = all_exist;
+	return status;
+}
+
+static int
+tst_metadataexists_operation_execute(const struct sieve_runtime_env *renv,
+				     sieve_size_t *address)
+{
+	bool metadata = sieve_operation_is(renv->oprtn,
+					   metadataexists_operation);
+	struct sieve_stringlist *anames;
+	string_t *mailbox;
+	bool trace = FALSE, all_exist = TRUE;
+	const char *error;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Read mailbox */
+	if (metadata) {
+		ret = sieve_opr_string_read(renv, address, "mailbox", &mailbox);
+		if (ret <= 0)
+			return ret;
+	}
+
+	/* Read annotation names */
+	ret = sieve_opr_stringlist_read(renv, address, "annotation-names",
+					&anames);
+	if (ret <= 0)
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	if (metadata &&
+	    !sieve_mailbox_check_name(str_c(mailbox), &error)) {
+		sieve_runtime_warning(
+			renv, NULL, "metadataexists test: "
+			"invalid mailbox name `%s' specified: %s",
+			str_sanitize(str_c(mailbox), 256), error);
+		sieve_interpreter_set_test_result(renv->interp, FALSE);
+		return SIEVE_EXEC_OK;
+	}
+
+	if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_TESTS)) {
+		if (metadata) {
+			sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+					    "metadataexists test");
+		} else {
+			sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+					    "servermetadataexists test");
+		}
+
+		sieve_runtime_trace_descend(renv);
+
+		trace = sieve_runtime_trace_active(renv, SIEVE_TRLVL_MATCHING);
+	}
+
+	ret = tst_metadataexists_check_annotations(
+		renv, (metadata ? str_c(mailbox) : NULL), anames, &all_exist);
+	if (ret <= 0)
+		return ret;
+
+	if (trace) {
+		if (all_exist) {
+			sieve_runtime_trace(renv, 0,
+					    "all annotations exist");
+		} else {
+			sieve_runtime_trace(renv, 0,
+					    "some annotations do not exist");
+		}
+	}
+
+	sieve_interpreter_set_test_result(renv->interp, all_exist);
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/mime/Makefile.am b/pigeonhole/src/lib-sieve/plugins/mime/Makefile.am
new file mode 100644
index 0000000..8ded659
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/mime/Makefile.am
@@ -0,0 +1,30 @@
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+
+AM_CPPFLAGS = \
+	-I$(srcdir)/../.. \
+	-I$(srcdir)/../../util \
+	-I$(srcdir)/../variables  \
+	$(LIBDOVECOT_INCLUDE)
+
+commands = \
+	cmd-foreverypart.c \
+	cmd-break.c \
+	cmd-extracttext.c
+
+tags = \
+	tag-mime.c
+
+extensions = \
+	ext-mime.c \
+	ext-foreverypart.c \
+	ext-extracttext.c
+
+libsieve_ext_mime_la_SOURCES = \
+	ext-mime-common.c \
+	$(commands) \
+	$(tags) \
+	$(extensions)
+
+noinst_HEADERS = \
+	ext-mime-common.h
+
diff --git a/pigeonhole/src/lib-sieve/plugins/mime/Makefile.in b/pigeonhole/src/lib-sieve/plugins/mime/Makefile.in
new file mode 100644
index 0000000..cfe25ff
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/mime/Makefile.in
@@ -0,0 +1,727 @@
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+# with or without modifications, as long as this notice is preserved.
+
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+	cmd-foreverypart.c \
+	cmd-break.c \
+	cmd-extracttext.c
+
+tags = \
+	tag-mime.c
+
+extensions = \
+	ext-mime.c \
+	ext-foreverypart.c \
+	ext-extracttext.c
+
+libsieve_ext_mime_la_SOURCES = \
+	ext-mime-common.c \
+	$(commands) \
+	$(tags) \
+	$(extensions)
+
+noinst_HEADERS = \
+	ext-mime-common.h
+
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+
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+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/lib-sieve/plugins/mime/Makefile'; \
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+	  $(AUTOMAKE) --foreign src/lib-sieve/plugins/mime/Makefile
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+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+libsieve_ext_mime.la: $(libsieve_ext_mime_la_OBJECTS) $(libsieve_ext_mime_la_DEPENDENCIES) $(EXTRA_libsieve_ext_mime_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(LINK)  $(libsieve_ext_mime_la_OBJECTS) $(libsieve_ext_mime_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/cmd-break.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/cmd-extracttext.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/cmd-foreverypart.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-extracttext.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-foreverypart.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-mime-common.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-mime.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/tag-mime.Plo@am__quote@ # am--include-marker
+
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+	      $$unique; \
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+	fi
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+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
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+			   sort -u` ;; \
+	esac; \
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+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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+	fi
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+
+distclean-generic:
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+	-rm -f ./$(DEPDIR)/ext-extracttext.Plo
+	-rm -f ./$(DEPDIR)/ext-foreverypart.Plo
+	-rm -f ./$(DEPDIR)/ext-mime-common.Plo
+	-rm -f ./$(DEPDIR)/ext-mime.Plo
+	-rm -f ./$(DEPDIR)/tag-mime.Plo
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+	-rm -f ./$(DEPDIR)/ext-extracttext.Plo
+	-rm -f ./$(DEPDIR)/ext-foreverypart.Plo
+	-rm -f ./$(DEPDIR)/ext-mime-common.Plo
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+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/mime/cmd-break.c b/pigeonhole/src/lib-sieve/plugins/mime/cmd-break.c
new file mode 100644
index 0000000..e6ade4c
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/mime/cmd-break.c
@@ -0,0 +1,273 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-binary.h"
+#include "sieve-dump.h"
+
+#include "ext-mime-common.h"
+
+#include <ctype.h>
+
+/* break
+ *
+ * Syntax:
+ *   break [":name" <name: string>]
+ *
+ */
+
+static bool cmd_break_registered
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+static bool cmd_break_pre_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool cmd_break_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool cmd_break_generate
+	(const struct sieve_codegen_env *cgenv,
+		struct sieve_command *ctx);
+
+const struct sieve_command_def cmd_break = {
+	.identifier = "break",
+	.type = SCT_COMMAND,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = cmd_break_registered,
+	.pre_validate = cmd_break_pre_validate,
+	.validate = cmd_break_validate,
+	.generate = cmd_break_generate,
+};
+
+/*
+ * Tagged arguments
+ */
+
+/* Forward declarations */
+
+static bool cmd_break_validate_name_tag
+	(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *cmd);
+
+/* Argument objects */
+
+static const struct sieve_argument_def break_name_tag = {
+	.identifier = "name",
+	.validate = cmd_break_validate_name_tag
+};
+
+/*
+ * Break operation
+ */
+
+static bool cmd_break_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int cmd_break_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def break_operation = {
+	.mnemonic = "BREAK",
+	.ext_def = &foreverypart_extension,
+	.code = EXT_FOREVERYPART_OPERATION_BREAK,
+	.dump = cmd_break_operation_dump,
+	.execute = cmd_break_operation_execute
+};
+
+/*
+ * Validation data
+ */
+
+struct cmd_break_data {
+	struct sieve_ast_argument *name;
+	struct sieve_command *loop_cmd;
+};
+
+/*
+ * Tag validation
+ */
+
+static bool cmd_break_validate_name_tag
+(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+    struct sieve_command *cmd)
+{
+	struct cmd_break_data *data =
+		(struct cmd_break_data *)cmd->data;
+	struct sieve_ast_argument *tag = *arg;
+
+	/* Detach the tag itself */
+	*arg = sieve_ast_arguments_detach(*arg, 1);
+
+	/* Check syntax:
+	 *   :name <string>
+	 */
+	if ( !sieve_validate_tag_parameter
+		(valdtr, cmd, tag, *arg, NULL, 0, SAAT_STRING, TRUE) )
+		return FALSE;
+	data->name = *arg;
+
+	/* Skip parameter */
+	*arg = sieve_ast_argument_next(*arg);
+	return TRUE;
+}
+
+/*
+ * Command registration
+ */
+
+static bool cmd_break_registered
+(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+	struct sieve_command_registration *cmd_reg)
+{
+	sieve_validator_register_tag
+		(valdtr, cmd_reg, ext, &break_name_tag, 0);
+	
+	return TRUE;
+}
+
+/*
+ * Command validation
+ */
+
+static bool cmd_break_pre_validate
+(struct sieve_validator *valdtr ATTR_UNUSED, struct sieve_command *cmd)
+{
+	struct cmd_break_data *data;
+	pool_t pool = sieve_command_pool(cmd);
+	
+	data = p_new(pool, struct cmd_break_data, 1);
+	cmd->data = data;
+	return TRUE;
+}
+
+static bool cmd_break_validate
+(struct sieve_validator *valdtr, struct sieve_command *cmd)
+{
+	struct cmd_break_data *data =
+		(struct cmd_break_data *)cmd->data;
+	struct sieve_ast_node *node = cmd->ast_node;
+	const char *name =	( data->name == NULL ?
+		NULL : sieve_ast_argument_strc(data->name) );
+
+	i_assert(node != NULL);
+	while ( node != NULL && node->command != NULL ) {
+		if ( sieve_command_is(node->command, cmd_foreverypart) ) {
+			struct ext_foreverypart_loop *loop =
+				(struct ext_foreverypart_loop *)node->command->data;
+			if ( name == NULL ||
+				(name != NULL && loop->name != NULL &&
+					strcmp(name, loop->name) == 0) ) {
+				data->loop_cmd = node->command;
+				break;
+			}
+		}
+		node = sieve_ast_node_parent(node);
+	}
+
+	if ( data->loop_cmd == NULL ) {
+		if ( name == NULL ) {
+			sieve_command_validate_error(valdtr, cmd,
+				"the break command is not placed inside "
+				"a foreverypart loop");
+		} else {
+			sieve_command_validate_error(valdtr, cmd,
+				"the break command is not placed inside "
+				"a foreverypart loop named `%s'",
+				name);
+		}
+		return FALSE;
+	}
+
+	sieve_command_exit_block_unconditionally(cmd);
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool cmd_break_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	struct cmd_break_data *data =
+		(struct cmd_break_data *)cmd->data;
+	struct ext_foreverypart_loop *loop;
+
+	i_assert( data->loop_cmd != NULL );
+	loop = (struct ext_foreverypart_loop *)data->loop_cmd->data;
+
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &break_operation);
+	sieve_jumplist_add(loop->exit_jumps,
+		sieve_binary_emit_offset(cgenv->sblock, 0));
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool cmd_break_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	unsigned int pc = *address;
+	sieve_offset_t offset;
+
+	sieve_code_dumpf(denv, "BREAK");
+	sieve_code_descend(denv);
+
+ 	if ( !sieve_binary_read_offset(denv->sblock, address, &offset) )
+		return FALSE;
+
+	sieve_code_dumpf(denv, "END: %d [%08x]", offset, pc + offset);
+	return TRUE;
+}
+
+/*
+ * Code execution
+ */
+
+static int cmd_break_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	struct sieve_interpreter_loop *loop;
+	unsigned int pc = *address;
+	sieve_offset_t offset;
+	sieve_size_t loop_end;
+
+	/*
+	 * Read operands
+	 */
+
+	if ( !sieve_binary_read_offset(renv->sblock, address, &offset) )
+	{
+		sieve_runtime_trace_error(renv, "invalid loop end offset");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	loop_end = pc + offset;
+
+	/*
+	 * Perform operation
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_ACTIONS, "break command");
+	sieve_runtime_trace_descend(renv);
+
+	loop = sieve_interpreter_loop_get
+		(renv->interp, loop_end, &foreverypart_extension);
+	if ( loop == NULL ) {
+		sieve_runtime_trace_error(renv, "no matching loop found");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	sieve_interpreter_loop_break(renv->interp, loop);
+	return SIEVE_EXEC_OK;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/mime/cmd-extracttext.c b/pigeonhole/src/lib-sieve/plugins/mime/cmd-extracttext.c
new file mode 100644
index 0000000..d9b31a2
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/mime/cmd-extracttext.c
@@ -0,0 +1,370 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "array.h"
+
+#include "sieve-common.h"
+#include "sieve-extensions.h"
+#include "sieve-code.h"
+#include "sieve-ast.h"
+#include "sieve-commands.h"
+#include "sieve-binary.h"
+#include "sieve-message.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "sieve-ext-variables.h"
+
+#include "ext-mime-common.h"
+
+/*
+ * Extracttext command
+ *
+ * Syntax:
+ *    extracttext [MODIFIER] [":first" number] <varname: string>
+ */
+
+static bool cmd_extracttext_registered
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+static bool cmd_extracttext_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool cmd_extracttext_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx);
+
+const struct sieve_command_def cmd_extracttext = {
+	.identifier = "extracttext",
+	.type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = cmd_extracttext_registered,
+	.validate = cmd_extracttext_validate,
+	.generate = cmd_extracttext_generate
+};
+
+/*
+ * Extracttext command tags
+ */
+
+enum cmd_extracttext_optional {
+	CMD_EXTRACTTEXT_OPT_END,
+	CMD_EXTRACTTEXT_OPT_FIRST
+};
+
+static bool cmd_extracttext_validate_first_tag
+	(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *cmd);
+
+static const struct sieve_argument_def extracttext_from_tag = {
+	.identifier = "first",
+	.validate = cmd_extracttext_validate_first_tag
+};
+
+/*
+ * Extracttext operation
+ */
+
+static bool cmd_extracttext_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int cmd_extracttext_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def extracttext_operation = {
+	.mnemonic = "EXTRACTTEXT",
+	.ext_def = &extracttext_extension,
+	.dump = cmd_extracttext_operation_dump,
+	.execute = cmd_extracttext_operation_execute
+};
+
+/*
+ * Compiler context
+ */
+
+struct cmd_extracttext_context {
+	ARRAY_TYPE(sieve_variables_modifier) modifiers;
+};
+
+/*
+ * Tag validation
+ */
+
+static bool cmd_extracttext_validate_first_tag
+(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+	struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+
+	/* Detach the tag itself */
+	*arg = sieve_ast_arguments_detach(*arg,1);
+
+	/* Check syntax:
+	 *   :first <number>
+	 */
+	if ( !sieve_validate_tag_parameter
+		(valdtr, cmd, tag, *arg, NULL, 0, SAAT_NUMBER, FALSE) )
+		return FALSE;
+
+	/* Skip parameter */
+	*arg = sieve_ast_argument_next(*arg);
+
+	return TRUE;
+}
+
+/* Command registration */
+
+static bool cmd_extracttext_registered
+(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+	struct sieve_command_registration *cmd_reg)
+{
+	struct ext_extracttext_context *ectx =
+		(struct ext_extracttext_context *)ext->context;
+
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+		&extracttext_from_tag, CMD_EXTRACTTEXT_OPT_FIRST);
+	sieve_variables_modifiers_link_tag
+		(valdtr, ectx->var_ext, cmd_reg);
+	return TRUE;
+}
+
+/*
+ * Command validation
+ */
+
+static bool cmd_extracttext_validate(struct sieve_validator *valdtr,
+	struct sieve_command *cmd)
+{
+	const struct sieve_extension *this_ext = cmd->ext;
+	struct ext_extracttext_context *ectx =
+		(struct ext_extracttext_context *)this_ext->context;
+	struct sieve_ast_node *node = cmd->ast_node;
+	struct sieve_ast_argument *arg = cmd->first_positional;
+	pool_t pool = sieve_command_pool(cmd);
+	struct cmd_extracttext_context *sctx;
+
+	/* Create command context */
+	sctx = p_new(pool, struct cmd_extracttext_context, 1);
+	p_array_init(&sctx->modifiers, pool, 4);
+	cmd->data = (void *) sctx;
+
+	/* Validate modifiers */
+	if ( !sieve_variables_modifiers_validate
+		(valdtr, cmd, &sctx->modifiers) )
+		return FALSE;
+
+	/* Validate varname argument */
+	if ( !sieve_validate_positional_argument
+		(valdtr, cmd, arg, "varname", 1, SAAT_STRING) ) {
+		return FALSE;
+	}
+	if ( !sieve_variable_argument_activate
+		(ectx->var_ext, ectx->var_ext, valdtr, cmd, arg, TRUE) )
+		return FALSE;
+
+	/* Check foreverypart context */
+	i_assert(node != NULL);
+	while ( node != NULL ) {
+		if ( node->command != NULL &&
+			sieve_command_is(node->command, cmd_foreverypart) )
+			break;
+		node = sieve_ast_node_parent(node);
+	}
+
+	if ( node == NULL ) {
+		sieve_command_validate_error(valdtr, cmd,
+			"the extracttext command is not placed inside "
+			"a foreverypart loop");
+		return FALSE;
+	}
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool cmd_extracttext_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	const struct sieve_extension *this_ext = cmd->ext;
+	struct sieve_binary_block *sblock = cgenv->sblock;
+	struct cmd_extracttext_context *sctx =
+		(struct cmd_extracttext_context *) cmd->data;
+
+	sieve_operation_emit(sblock, this_ext, &extracttext_operation);
+
+	/* Generate arguments */
+	if ( !sieve_generate_arguments(cgenv, cmd, NULL) )
+		return FALSE;
+
+	/* Generate modifiers */
+	if ( !sieve_variables_modifiers_generate
+		(cgenv, &sctx->modifiers) )
+		return FALSE;
+
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool cmd_extracttext_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	int opt_code = 0;
+
+	sieve_code_dumpf(denv, "EXTRACTTEXT");
+	sieve_code_descend(denv);
+
+	/* Dump optional operands */
+
+	for (;;) {
+		int opt;
+		bool opok = TRUE;
+
+		if ( (opt=sieve_opr_optional_dump(denv, address, &opt_code)) < 0 )
+			return FALSE;
+		if ( opt == 0 ) break;
+
+		switch ( opt_code ) {
+		case CMD_EXTRACTTEXT_OPT_FIRST:
+			opok = sieve_opr_number_dump(denv, address, "first");
+			break;
+		default:
+			return FALSE;
+		}
+		if ( !opok ) return FALSE;
+	}
+
+	/* Print both variable name and string value */
+	if ( !sieve_opr_string_dump(denv, address, "varname") )
+		return FALSE;
+
+	return sieve_variables_modifiers_code_dump(denv, address);
+}
+
+/*
+ * Code execution
+ */
+
+static int cmd_extracttext_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	const struct sieve_extension *this_ext = renv->oprtn->ext;
+	struct ext_extracttext_context *ectx =
+		(struct ext_extracttext_context *)this_ext->context;
+	struct sieve_variable_storage *storage;
+	ARRAY_TYPE(sieve_variables_modifier) modifiers;
+	struct ext_foreverypart_runtime_loop *sfploop;
+	struct sieve_message_part *mpart;
+	struct sieve_message_part_data mpart_data;
+	int opt_code = 0;
+	sieve_number_t first = 0;
+	string_t *value;
+	unsigned int var_index;
+	bool have_first = FALSE;
+	int ret = SIEVE_EXEC_OK;
+
+	/*
+	 * Read the normal operands
+	 */
+
+	/* Optional operands */
+
+	for (;;) {
+		int opt;
+
+		if ( (opt=sieve_opr_optional_read
+			(renv, address, &opt_code)) < 0 )
+			return SIEVE_EXEC_BIN_CORRUPT;
+		if ( opt == 0 ) break;
+
+		switch ( opt_code ) {
+		case CMD_EXTRACTTEXT_OPT_FIRST:
+			ret = sieve_opr_number_read
+				(renv, address, "first", &first);
+			have_first = TRUE;
+			break;
+		default:
+			sieve_runtime_trace_error(renv, "unknown optional operand");
+			return SIEVE_EXEC_BIN_CORRUPT;
+		}
+		if ( ret <= 0 ) return ret;
+	}
+
+	/* Varname operand */
+
+	if ( (ret=sieve_variable_operand_read
+		(renv, address, "varname", &storage, &var_index)) <= 0 )
+		return ret;
+
+	/* Modifiers */
+
+	if ( (ret=sieve_variables_modifiers_code_read
+		(renv, ectx->var_ext, address, &modifiers)) <= 0 )
+		return ret;
+
+	/*
+	 * Determine and assign the value
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS, "extracttext command");
+	sieve_runtime_trace_descend(renv);
+
+	sfploop = ext_foreverypart_runtime_loop_get_current(renv);
+	if ( sfploop == NULL ) {
+		sieve_runtime_trace_error(renv,
+			"outside foreverypart context");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	/* Get current message part */
+	mpart = sieve_message_part_iter_current(&sfploop->part_iter);
+	i_assert( mpart != NULL );
+
+	/* Get message part content */
+	sieve_message_part_get_data(mpart, &mpart_data, TRUE);
+
+	/* Apply ":first" limit, if any */
+	if ( !have_first || (size_t)first > mpart_data.size ) {
+		value = t_str_new_const(mpart_data.content, mpart_data.size);
+	} else {
+		value = t_str_new((size_t)first);
+		str_append_data(value, mpart_data.content, (size_t)first);
+	}
+
+	/* Apply modifiers */
+	if ( (ret=sieve_variables_modifiers_apply
+		(renv, ectx->var_ext, &modifiers, &value)) <= 0 )
+		return ret;
+
+	/* Actually assign the value if all is well */
+	i_assert ( value != NULL );
+	if ( !sieve_variable_assign(storage, var_index, value) )
+		return SIEVE_EXEC_BIN_CORRUPT;
+
+	/* Trace */
+	if ( sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS) ) {
+		const char *var_name, *var_id;
+
+		(void)sieve_variable_get_identifier(storage, var_index, &var_name);
+		var_id = sieve_variable_get_varid(storage, var_index);
+
+		sieve_runtime_trace_here(renv, 0, "assign `%s' [%s] = \"%s\"",
+			var_name, var_id, str_c(value));
+	}
+
+	return SIEVE_EXEC_OK;
+}
+
+
+
+
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/mime/cmd-foreverypart.c b/pigeonhole/src/lib-sieve/plugins/mime/cmd-foreverypart.c
new file mode 100644
index 0000000..435cb5c
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/mime/cmd-foreverypart.c
@@ -0,0 +1,377 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-limits.h"
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-binary.h"
+#include "sieve-dump.h"
+#include "sieve-message.h"
+
+#include "ext-mime-common.h"
+
+#include <ctype.h>
+
+/* Foreverypart
+ *
+ * Syntax:
+ *   foreverypart [":name" <name: string>] <block>
+ *
+ */
+
+static bool cmd_foreverypart_registered
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+static bool cmd_foreverypart_pre_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool cmd_foreverypart_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool cmd_foreverypart_generate
+	(const struct sieve_codegen_env *cgenv,
+		struct sieve_command *ctx);
+
+const struct sieve_command_def cmd_foreverypart = {
+	.identifier = "foreverypart",
+	.type = SCT_COMMAND,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = TRUE,
+	.block_required = TRUE,
+	.registered = cmd_foreverypart_registered,
+	.pre_validate = cmd_foreverypart_pre_validate,
+	.validate = cmd_foreverypart_validate,
+	.generate = cmd_foreverypart_generate
+};
+
+/*
+ * Tagged arguments
+ */
+
+/* Forward declarations */
+
+static bool cmd_foreverypart_validate_name_tag
+	(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *cmd);
+
+/* Argument objects */
+
+static const struct sieve_argument_def foreverypart_name_tag = {
+	.identifier = "name",
+	.validate = cmd_foreverypart_validate_name_tag,
+};
+
+/*
+ * foreverypart operation
+ */
+
+static bool cmd_foreverypart_begin_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int cmd_foreverypart_begin_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def foreverypart_begin_operation = {
+	.mnemonic = "FOREVERYPART_BEGIN",
+	.ext_def = &foreverypart_extension,
+	.code = EXT_FOREVERYPART_OPERATION_FOREVERYPART_BEGIN,
+	.dump = cmd_foreverypart_begin_operation_dump,
+	.execute = cmd_foreverypart_begin_operation_execute
+};
+
+static bool cmd_foreverypart_end_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int cmd_foreverypart_end_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def foreverypart_end_operation = {
+	.mnemonic = "FOREVERYPART_END",
+	.ext_def = &foreverypart_extension,
+	.code = EXT_FOREVERYPART_OPERATION_FOREVERYPART_END,
+	.dump = cmd_foreverypart_end_operation_dump,
+	.execute = cmd_foreverypart_end_operation_execute
+};
+
+/*
+ * Tag validation
+ */
+
+static bool cmd_foreverypart_validate_name_tag
+(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+    struct sieve_command *cmd)
+{
+	struct ext_foreverypart_loop *loop =
+		(struct ext_foreverypart_loop *)cmd->data;
+	struct sieve_ast_argument *tag = *arg;
+
+	/* Detach the tag itself */
+	*arg = sieve_ast_arguments_detach(*arg, 1);
+
+	/* Check syntax:
+	 *   :name <string>
+	 */
+	if ( !sieve_validate_tag_parameter
+		(valdtr, cmd, tag, *arg, NULL, 0, SAAT_STRING, TRUE) )
+		return FALSE;
+	loop->name = sieve_ast_argument_strc(*arg);
+
+	/* Detach parameter */
+	*arg = sieve_ast_arguments_detach(*arg, 1);
+	return TRUE;
+}
+
+/*
+ * Command registration
+ */
+
+static bool cmd_foreverypart_registered
+(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+	struct sieve_command_registration *cmd_reg)
+{
+	sieve_validator_register_tag
+		(valdtr, cmd_reg, ext, &foreverypart_name_tag, 0);
+	return TRUE;
+}
+
+/*
+ * Command validation
+ */
+
+static bool cmd_foreverypart_pre_validate
+(struct sieve_validator *valdtr ATTR_UNUSED, struct sieve_command *cmd)
+{
+	struct ext_foreverypart_loop *loop;
+	pool_t pool = sieve_command_pool(cmd);
+	
+	loop = p_new(pool, struct ext_foreverypart_loop, 1);
+	cmd->data = loop;		
+
+	return TRUE;
+}
+
+static bool cmd_foreverypart_validate
+(struct sieve_validator *valdtr, struct sieve_command *cmd)
+{
+	struct sieve_ast_node *node = cmd->ast_node;
+	unsigned int nesting = 0;
+
+	/* Determine nesting depth of foreverypart commands at this point. */
+	i_assert(node != NULL);
+	node = sieve_ast_node_parent(node);
+	while ( node != NULL && node->command != NULL ) {
+		if ( sieve_command_is(node->command, cmd_foreverypart) )
+			nesting++;
+		node = sieve_ast_node_parent(node);
+	}
+
+	/* Enforce nesting limit
+	   NOTE: this only recognizes the foreverypart command as a loop; if
+	   new loop commands are introduced in the future, these must be 
+	   recognized somehow. */
+	if ( nesting + 1 > SIEVE_MAX_LOOP_DEPTH ) {
+		sieve_command_validate_error(valdtr, cmd,
+			"the nested foreverypart loop exceeds "
+			"the nesting limit (<= %u levels)",
+			SIEVE_MAX_LOOP_DEPTH);
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool cmd_foreverypart_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	struct ext_foreverypart_loop *loop =
+		(struct ext_foreverypart_loop *)cmd->data;
+	sieve_size_t block_begin, loop_jump;
+
+	/* Emit FOREVERYPART_BEGIN operation */
+	sieve_operation_emit(cgenv->sblock,
+		cmd->ext, &foreverypart_begin_operation);
+
+	/* Emit exit address */
+	loop->exit_jumps = sieve_jumplist_create
+		(sieve_command_pool(cmd), cgenv->sblock);
+	sieve_jumplist_add(loop->exit_jumps,
+		sieve_binary_emit_offset(cgenv->sblock, 0));
+	block_begin = sieve_binary_block_get_size(cgenv->sblock);
+
+	/* Generate loop block */
+	if ( !sieve_generate_block(cgenv, cmd->ast_node) )
+		return FALSE;
+
+	/* Emit FOREVERYPART_END operation */
+	sieve_operation_emit(cgenv->sblock,
+		cmd->ext, &foreverypart_end_operation);
+	loop_jump = sieve_binary_block_get_size(cgenv->sblock);
+	i_assert(loop_jump > block_begin);
+	(void)sieve_binary_emit_offset
+		(cgenv->sblock, (loop_jump - block_begin));
+	
+	/* Resolve exit address */
+	sieve_jumplist_resolve(loop->exit_jumps);
+
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool cmd_foreverypart_begin_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	unsigned int pc = *address;
+	sieve_offset_t offset;
+
+	sieve_code_dumpf(denv, "FOREVERYPART_BEGIN");
+	sieve_code_descend(denv);
+
+ 	if ( !sieve_binary_read_offset(denv->sblock, address, &offset) )
+		return FALSE;
+
+	sieve_code_dumpf(denv, "END: %d [%08x]", offset, pc + offset);
+	return TRUE;
+}
+
+static bool cmd_foreverypart_end_operation_dump
+(const struct sieve_dumptime_env *denv,
+	sieve_size_t *address ATTR_UNUSED)
+{
+	unsigned int pc = *address;
+	sieve_offset_t offset;
+
+	sieve_code_dumpf(denv, "FOREVERYPART_END");
+	sieve_code_descend(denv);
+
+	if ( !sieve_binary_read_offset(denv->sblock, address, &offset) )
+		return FALSE;
+
+	sieve_code_dumpf(denv, "BEGIN: -%d [%08x]", offset, pc - offset);
+	return TRUE;
+}
+
+/*
+ * Code execution
+ */
+
+static int cmd_foreverypart_begin_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	struct sieve_interpreter_loop *loop;
+	struct ext_foreverypart_runtime_loop *fploop, *sfploop;
+	unsigned int pc = *address;
+	sieve_offset_t offset;
+	sieve_size_t loop_end;
+	pool_t pool;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	if ( !sieve_binary_read_offset(renv->sblock, address, &offset) )
+	{
+		sieve_runtime_trace_error(renv, "invalid loop end offset");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	loop_end = pc + offset;
+
+	/*
+	 * Perform operation
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS,
+		"foreverypart loop begin");
+	sieve_runtime_trace_descend(renv);
+
+	sfploop = ext_foreverypart_runtime_loop_get_current(renv);
+
+	if ( (ret=sieve_interpreter_loop_start(renv->interp,
+		loop_end, &foreverypart_extension, &loop)) <= 0 )
+		return ret;
+
+	pool = sieve_interpreter_loop_get_pool(loop);
+	fploop = p_new(pool, struct ext_foreverypart_runtime_loop, 1);
+	
+	if ( sfploop == NULL ) {
+		if ( (ret=sieve_message_part_iter_init
+			(&fploop->part_iter, renv)) <= 0 )
+			return ret;
+	} else {
+		sieve_message_part_iter_children(&sfploop->part_iter,
+			&fploop->part_iter);
+	}
+	fploop->part = sieve_message_part_iter_current(&fploop->part_iter);
+	if (fploop->part != NULL) {
+		sieve_interpreter_loop_set_context(loop, (void*)fploop);
+	} else {
+		/* No children parts to iterate */
+		sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS,
+			"no children at this level");
+		sieve_interpreter_loop_break(renv->interp, loop);
+	} 
+	return SIEVE_EXEC_OK;
+}
+
+static int cmd_foreverypart_end_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	struct sieve_interpreter_loop *loop;
+	struct ext_foreverypart_runtime_loop *fploop;
+	unsigned int pc = *address;
+	sieve_offset_t offset;
+	sieve_size_t loop_begin;
+
+	/*
+	 * Read operands
+	 */
+
+	if ( !sieve_binary_read_offset(renv->sblock, address, &offset) )
+	{
+		sieve_runtime_trace_error(renv, "invalid loop begin offset");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	loop_begin = pc - offset;
+
+	/*
+	 * Perform operation
+	 */
+
+	sieve_runtime_trace(renv,
+		SIEVE_TRLVL_COMMANDS, "foreverypart loop end");
+	sieve_runtime_trace_descend(renv);
+
+	loop = sieve_interpreter_loop_get
+		(renv->interp, *address, &foreverypart_extension);
+	if ( loop == NULL ) {
+		sieve_runtime_trace_error(renv, "no matching loop found");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	fploop = (struct ext_foreverypart_runtime_loop *)
+		sieve_interpreter_loop_get_context(loop);
+	i_assert(fploop->part != NULL);
+	fploop->part = sieve_message_part_iter_next(&fploop->part_iter);
+	if ( fploop->part == NULL ) {
+		sieve_runtime_trace(renv,
+			SIEVE_TRLVL_COMMANDS, "no more message parts");
+		return sieve_interpreter_loop_break(renv->interp, loop);
+	}
+
+	sieve_runtime_trace(renv,
+		SIEVE_TRLVL_COMMANDS, "switched to next message part");
+	return sieve_interpreter_loop_next(renv->interp, loop, loop_begin);
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/mime/ext-extracttext.c b/pigeonhole/src/lib-sieve/plugins/mime/ext-extracttext.c
new file mode 100644
index 0000000..4eab76b
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/mime/ext-extracttext.c
@@ -0,0 +1,130 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension extracttext
+ * ---------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 5703, Section 7
+ * Implementation: full
+ * Status: experimental
+ *
+ */
+
+#include "sieve-common.h"
+
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-actions.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-result.h"
+
+#include "sieve-ext-variables.h"
+
+#include "ext-mime-common.h"
+
+/*
+ * Extension
+ */
+
+static bool ext_extracttext_load
+	(const struct sieve_extension *ext, void **context);
+static void ext_extracttext_unload
+	(const struct sieve_extension *ext);
+static bool ext_extracttext_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+
+const struct sieve_extension_def extracttext_extension = {
+	.name = "extracttext",
+	.load = ext_extracttext_load,
+	.unload = ext_extracttext_unload,
+	.validator_load = ext_extracttext_validator_load,
+	SIEVE_EXT_DEFINE_OPERATION(extracttext_operation)
+};
+
+static bool ext_extracttext_load
+(const struct sieve_extension *ext, void **context)
+{
+	struct sieve_instance *svinst = ext->svinst;
+	struct ext_extracttext_context *ectx;
+
+	if ( *context != NULL )
+		ext_extracttext_unload(ext);
+
+	ectx = i_new(struct ext_extracttext_context, 1);
+	ectx->var_ext = sieve_ext_variables_get_extension(ext->svinst);
+	ectx->fep_ext = sieve_extension_register
+		(svinst, &foreverypart_extension, FALSE);
+	*context = (void *)ectx;
+	return TRUE;
+}
+
+static void ext_extracttext_unload
+(const struct sieve_extension *ext)
+{
+	struct ext_extracttext_context *ctx =
+		(struct ext_extracttext_context *) ext->context;
+
+	i_free(ctx);
+}
+
+/*
+ * Extension validation
+ */
+
+static bool ext_extracttext_validator_validate
+	(const struct sieve_extension *ext,
+		struct sieve_validator *valdtr, void *context,
+		struct sieve_ast_argument *require_arg,
+		bool required);
+
+const struct sieve_validator_extension
+extracttext_validator_extension = {
+	.ext = &extracttext_extension,
+	.validate = ext_extracttext_validator_validate
+};
+
+static bool ext_extracttext_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	/* Register validator extension to check for conflict with eextracttext */
+	sieve_validator_extension_register
+		(valdtr, ext, &extracttext_validator_extension, NULL);
+
+	/* Register new commands */
+	sieve_validator_register_command(valdtr, ext, &cmd_extracttext);
+
+	return TRUE;
+}
+
+static bool ext_extracttext_validator_validate
+(const struct sieve_extension *ext,
+	struct sieve_validator *valdtr, void *context ATTR_UNUSED,
+	struct sieve_ast_argument *require_arg,
+	bool required ATTR_UNUSED)
+{
+	struct ext_extracttext_context *ectx =
+		(struct ext_extracttext_context *)ext->context;
+
+	if ( ectx->var_ext == NULL ||
+		!sieve_ext_variables_is_active
+			(ectx->var_ext, valdtr) ) {
+		sieve_argument_validate_error(valdtr, require_arg,
+			"extracttext extension cannot be used "
+			"without variables extension");
+		return FALSE;
+	}
+	if ( ectx->fep_ext == NULL ||
+		!sieve_validator_extension_loaded
+	    (valdtr, ectx->fep_ext) ) {
+		sieve_argument_validate_error(valdtr, require_arg,
+			"extracttext extension cannot be used "
+			"without foreverypart extension");
+		return FALSE;
+	}
+
+	return TRUE;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/mime/ext-foreverypart.c b/pigeonhole/src/lib-sieve/plugins/mime/ext-foreverypart.c
new file mode 100644
index 0000000..6bca199
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/mime/ext-foreverypart.c
@@ -0,0 +1,62 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension foreverypart
+ * ----------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 5703, Section 3
+ * Implementation: full
+ * Status: experimental
+ *
+ */
+
+#include "sieve-common.h"
+
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-actions.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-result.h"
+
+#include "ext-mime-common.h"
+
+/*
+ * Operations
+ */
+
+const struct sieve_operation_def *ext_foreverypart_operations[] = {
+	&foreverypart_begin_operation,
+	&foreverypart_end_operation,
+	&break_operation
+};
+
+/*
+ * Extension
+ */
+
+static bool ext_foreverypart_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+
+const struct sieve_extension_def foreverypart_extension = {
+	.name = "foreverypart",
+	.validator_load = ext_foreverypart_validator_load,
+	SIEVE_EXT_DEFINE_OPERATIONS(ext_foreverypart_operations)
+};
+
+/*
+ * Extension validation
+ */
+
+static bool ext_foreverypart_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	/* Register new commands */
+	sieve_validator_register_command(valdtr, ext, &cmd_foreverypart);
+	sieve_validator_register_command(valdtr, ext, &cmd_break);
+
+	return TRUE;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/mime/ext-mime-common.c b/pigeonhole/src/lib-sieve/plugins/mime/ext-mime-common.c
new file mode 100644
index 0000000..5b38bcb
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/mime/ext-mime-common.c
@@ -0,0 +1,27 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-interpreter.h"
+
+#include "ext-mime-common.h"
+
+struct ext_foreverypart_runtime_loop *
+ext_foreverypart_runtime_loop_get_current
+(const struct sieve_runtime_env *renv)
+{
+	struct sieve_interpreter_loop *loop;
+	struct ext_foreverypart_runtime_loop *fploop;
+
+	loop = sieve_interpreter_loop_get_global
+		(renv->interp, NULL, &foreverypart_extension);
+	if ( loop == NULL ) {
+		fploop = NULL;
+	} else {
+		fploop = (struct ext_foreverypart_runtime_loop *)
+			sieve_interpreter_loop_get_context(loop);
+		i_assert(fploop->part != NULL);
+	}
+
+	return fploop;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/mime/ext-mime-common.h b/pigeonhole/src/lib-sieve/plugins/mime/ext-mime-common.h
new file mode 100644
index 0000000..8b0054d
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/mime/ext-mime-common.h
@@ -0,0 +1,85 @@
+#ifndef EXT_FOREVERYPART_COMMON_H
+#define EXT_FOREVERYPART_COMMON_H
+
+#include "sieve-message.h"
+
+/*
+ * Extension
+ */
+
+struct ext_extracttext_context {
+	const struct sieve_extension *var_ext;
+	const struct sieve_extension *fep_ext;
+};
+
+extern const struct sieve_extension_def foreverypart_extension;
+extern const struct sieve_extension_def mime_extension;
+extern const struct sieve_extension_def extracttext_extension;
+
+/*
+ * Tagged arguments
+ */
+
+extern const struct sieve_argument_def mime_tag;
+extern const struct sieve_argument_def mime_anychild_tag;
+extern const struct sieve_argument_def mime_type_tag;
+extern const struct sieve_argument_def mime_subtype_tag;
+extern const struct sieve_argument_def mime_contenttype_tag;
+extern const struct sieve_argument_def mime_param_tag;
+
+/*
+ * Commands
+ */
+
+struct ext_foreverypart_loop {
+	const char *name;
+	struct sieve_jumplist *exit_jumps;
+};
+
+extern const struct sieve_command_def cmd_foreverypart;
+extern const struct sieve_command_def cmd_break;
+extern const struct sieve_command_def cmd_extracttext;
+
+/*
+ * Operations
+ */
+
+extern const struct sieve_operation_def foreverypart_begin_operation;
+extern const struct sieve_operation_def foreverypart_end_operation;
+extern const struct sieve_operation_def break_operation;
+extern const struct sieve_operation_def extracttext_operation;
+
+enum ext_foreverypart_opcode {
+	EXT_FOREVERYPART_OPERATION_FOREVERYPART_BEGIN,
+	EXT_FOREVERYPART_OPERATION_FOREVERYPART_END,
+	EXT_FOREVERYPART_OPERATION_BREAK,
+};
+
+/*
+ * Operands
+ */
+
+enum ext_mime_option {
+	EXT_MIME_OPTION_NONE = 0,
+	EXT_MIME_OPTION_TYPE,
+	EXT_MIME_OPTION_SUBTYPE,
+	EXT_MIME_OPTION_CONTENTTYPE,
+	EXT_MIME_OPTION_PARAM
+};
+
+extern const struct sieve_operand_def mime_operand;
+
+/*
+ * Foreverypart loop
+ */
+
+struct ext_foreverypart_runtime_loop {
+	struct sieve_message_part_iter part_iter;
+	struct sieve_message_part *part;
+};
+
+struct ext_foreverypart_runtime_loop *
+ext_foreverypart_runtime_loop_get_current
+(const struct sieve_runtime_env *renv);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/mime/ext-mime.c b/pigeonhole/src/lib-sieve/plugins/mime/ext-mime.c
new file mode 100644
index 0000000..da9963f
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/mime/ext-mime.c
@@ -0,0 +1,77 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension mime
+ * --------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 5703, Section 4
+ * Implementation: full
+ * Status: experimental
+ *
+ */
+
+#include "sieve-common.h"
+
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-actions.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-message.h"
+#include "sieve-result.h"
+
+#include "ext-mime-common.h"
+
+/*
+ * Extension
+ */
+
+static bool ext_mime_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+
+const struct sieve_extension_def mime_extension = {
+	.name = "mime",
+	.validator_load = ext_mime_validator_load,
+	SIEVE_EXT_DEFINE_OPERAND(mime_operand)
+};
+
+/*
+ * Extension validation
+ */
+
+static bool ext_mime_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	/* Register :mime tag and friends with header, address and exists test
+	 * commands and we don't care whether these command are registered or
+	 * even whether these will be registered at all. The validator handles
+	 * either situation gracefully.
+	 */
+	sieve_validator_register_external_tag
+		(valdtr, "header", ext, &mime_tag, SIEVE_OPT_MESSAGE_OVERRIDE);
+	sieve_validator_register_external_tag
+		(valdtr, "header", ext, &mime_anychild_tag, 0);
+	sieve_validator_register_external_tag
+		(valdtr, "header", ext, &mime_type_tag, 0);
+	sieve_validator_register_external_tag
+		(valdtr, "header", ext, &mime_subtype_tag, 0);
+	sieve_validator_register_external_tag
+		(valdtr, "header", ext, &mime_contenttype_tag, 0);
+	sieve_validator_register_external_tag
+		(valdtr, "header", ext, &mime_param_tag, 0);
+
+	sieve_validator_register_external_tag
+		(valdtr, "address", ext, &mime_tag, SIEVE_OPT_MESSAGE_OVERRIDE);
+	sieve_validator_register_external_tag
+		(valdtr, "address", ext, &mime_anychild_tag, 0);
+
+	sieve_validator_register_external_tag
+		(valdtr, "exists", ext, &mime_tag, SIEVE_OPT_MESSAGE_OVERRIDE);
+	sieve_validator_register_external_tag
+		(valdtr, "exists", ext, &mime_anychild_tag, 0);
+
+	return TRUE;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/mime/tag-mime.c b/pigeonhole/src/lib-sieve/plugins/mime/tag-mime.c
new file mode 100644
index 0000000..379365e
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/mime/tag-mime.c
@@ -0,0 +1,757 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "rfc822-parser.h"
+#include "rfc2231-parser.h"
+#include "mail-storage.h"
+
+#include "sieve-common.h"
+#include "sieve-stringlist.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-binary.h"
+#include "sieve-code.h"
+#include "sieve-message.h"
+#include "sieve-result.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+
+#include "ext-mime-common.h"
+
+/*
+ * Tagged argument
+ */
+
+static bool tag_mime_validate
+	(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *cmd);
+static bool tag_mime_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+    struct sieve_command *context);
+
+const struct sieve_argument_def mime_tag = {
+	.identifier = "mime",
+	.validate = tag_mime_validate,
+	.generate = tag_mime_generate
+};
+
+static bool tag_mime_option_validate
+	(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *cmd);
+
+const struct sieve_argument_def mime_anychild_tag = {
+	.identifier = "anychild",
+	.validate = tag_mime_option_validate
+};
+
+const struct sieve_argument_def mime_type_tag = {
+	.identifier = "type",
+	.validate = tag_mime_option_validate
+};
+
+const struct sieve_argument_def mime_subtype_tag = {
+	.identifier = "subtype",
+	.validate = tag_mime_option_validate
+};
+
+const struct sieve_argument_def mime_contenttype_tag = {
+	.identifier = "contenttype",
+	.validate = tag_mime_option_validate
+};
+
+const struct sieve_argument_def mime_param_tag = {
+	.identifier = "param",
+	.validate = tag_mime_option_validate
+};
+
+/*
+ * Header override
+ */
+
+static bool svmo_mime_dump_context
+	(const struct sieve_message_override *svmo,
+		const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int svmo_mime_read_context
+	(const struct sieve_message_override *svmo,
+		const struct sieve_runtime_env *renv, sieve_size_t *address,
+		void **ho_context);
+static int svmo_mime_header_override
+	(const struct sieve_message_override *svmo,
+		const struct sieve_runtime_env *renv,
+		bool mime_decode, struct sieve_stringlist **headers);
+
+const struct sieve_message_override_def mime_header_override = {
+	SIEVE_OBJECT("mime", &mime_operand, 0),
+	.sequence = 0, /* Completely replace header source */
+	.dump_context = svmo_mime_dump_context,
+	.read_context = svmo_mime_read_context,
+	.header_override = svmo_mime_header_override
+};
+
+/*
+ * Operand
+ */
+
+static const struct sieve_extension_objects ext_header_overrides =
+	SIEVE_EXT_DEFINE_MESSAGE_OVERRIDE(mime_header_override);
+
+const struct sieve_operand_def mime_operand = {
+	.name = "mime operand",
+	.ext_def = &mime_extension,
+	.class = &sieve_message_override_operand_class,
+	.interface = &ext_header_overrides
+};
+
+/*
+ * Tag data
+ */
+
+struct tag_mime_data {
+	enum ext_mime_option mimeopt;
+	struct sieve_ast_argument *param_arg;
+	bool anychild:1;
+};
+
+/*
+ * Tag validation
+ */
+
+static struct tag_mime_data *
+tag_mime_get_data(struct sieve_command *cmd,
+	struct sieve_ast_argument *tag)
+{
+	struct tag_mime_data *data;
+
+	if (tag->argument->data == NULL) {
+		data = p_new(sieve_command_pool(cmd), struct tag_mime_data, 1);
+		tag->argument->data = (void *)data;
+	} else {
+		data = (struct tag_mime_data *)tag->argument->data;
+	}
+
+	return data;
+}
+
+static bool tag_mime_validate
+(struct sieve_validator *valdtr ATTR_UNUSED,
+	struct sieve_ast_argument **arg, struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+
+	/* Skip the tag itself */
+	*arg = sieve_ast_argument_next(*arg);
+
+	(void)tag_mime_get_data(cmd, tag);
+	return TRUE;
+}
+
+static bool tag_mime_option_validate
+(struct sieve_validator *valdtr ATTR_UNUSED,
+	struct sieve_ast_argument **arg, struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+	struct sieve_ast_argument *mime_arg;
+	struct tag_mime_data *data;
+
+	i_assert(tag != NULL);
+
+	/* Detach tag itself */
+	*arg = sieve_ast_arguments_detach(*arg,1);
+
+	/* Find required ":mime" tag */
+	mime_arg = sieve_command_find_argument(cmd, &mime_tag);
+	if ( mime_arg == NULL ) {
+		sieve_argument_validate_error(valdtr, tag,
+			"the :%s tag for the %s %s cannot be specified "
+			"without the :mime tag", sieve_ast_argument_tag(tag),
+			sieve_command_identifier(cmd), sieve_command_type_name(cmd));
+		return FALSE;
+	}
+
+	/* Annotate ":mime" tag with the data provided by this option tag */
+	data = tag_mime_get_data(cmd, mime_arg);
+	if ( sieve_argument_is(tag, mime_anychild_tag) )
+		data->anychild = TRUE;
+	else 	{
+		if ( data->mimeopt != EXT_MIME_OPTION_NONE ) {
+			sieve_argument_validate_error(valdtr, *arg,
+				"the :type, :subtype, :contenttype, and :param "
+				"arguments for the %s test are mutually exclusive, "
+				"but more than one was specified",
+				sieve_command_identifier(cmd));
+			return FALSE;
+		}
+		if ( sieve_argument_is(tag, mime_type_tag) )
+			data->mimeopt = EXT_MIME_OPTION_TYPE;
+		else 	if ( sieve_argument_is(tag, mime_subtype_tag) )
+			data->mimeopt = EXT_MIME_OPTION_SUBTYPE;
+		else 	if ( sieve_argument_is(tag, mime_contenttype_tag) )
+			data->mimeopt = EXT_MIME_OPTION_CONTENTTYPE;
+		else 	if ( sieve_argument_is(tag, mime_param_tag) ) {
+			/* Check syntax:
+			 *   ":param" <param-list: string-list>
+			 */
+			if ( !sieve_validate_tag_parameter
+				(valdtr, cmd, tag, *arg, NULL, 0, SAAT_STRING_LIST, FALSE) ) {
+				return FALSE;
+			}
+
+			data->mimeopt = EXT_MIME_OPTION_PARAM;
+			data->param_arg = *arg;
+
+			/* Detach parameter */
+			*arg = sieve_ast_arguments_detach(*arg,1);
+		} else
+			i_unreached();
+	}
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool tag_mime_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+	struct sieve_command *cmd)
+{
+	struct tag_mime_data *data =
+		(struct tag_mime_data *)arg->argument->data;
+
+	if ( sieve_ast_argument_type(arg) != SAAT_TAG )
+		return FALSE;
+
+	sieve_opr_message_override_emit
+		(cgenv->sblock, arg->argument->ext, &mime_header_override);
+
+	(void)sieve_binary_emit_byte
+		(cgenv->sblock, ( data->anychild ? 1 : 0 ));
+	(void)sieve_binary_emit_byte
+		(cgenv->sblock, data->mimeopt);
+	if ( data->mimeopt == EXT_MIME_OPTION_PARAM &&
+		!sieve_generate_argument(cgenv, data->param_arg, cmd) )
+		return FALSE;
+	return TRUE;
+}
+
+/*
+ * Content-type stringlist
+ */
+
+enum content_type_part {
+	CONTENT_TYPE_PART_NONE = 0,
+	CONTENT_TYPE_PART_TYPE,
+	CONTENT_TYPE_PART_SUBTYPE,
+	CONTENT_TYPE_PART_CONTENTTYPE,
+};
+
+/* Object */
+
+static int content_header_stringlist_next_item
+	(struct sieve_stringlist *_strlist, string_t **str_r);
+static void content_header_stringlist_reset
+	(struct sieve_stringlist *_strlist);
+static int content_header_stringlist_get_length
+	(struct sieve_stringlist *_strlist);
+static void content_header_stringlist_set_trace
+	(struct sieve_stringlist *strlist, bool trace);
+
+struct content_header_stringlist {
+	struct sieve_stringlist strlist;
+
+	struct sieve_header_list *source;
+
+	enum ext_mime_option option;
+	const char *const *params;
+
+	const char *const *param_values;
+};
+
+static struct sieve_stringlist *content_header_stringlist_create
+(const struct sieve_runtime_env *renv,
+	struct sieve_header_list *source,
+	enum ext_mime_option option, const char *const *params)
+{
+	struct content_header_stringlist *strlist;
+
+	strlist = t_new(struct content_header_stringlist, 1);
+	strlist->strlist.runenv = renv;
+	strlist->strlist.exec_status = SIEVE_EXEC_OK;
+	strlist->strlist.next_item = content_header_stringlist_next_item;
+	strlist->strlist.reset = content_header_stringlist_reset;
+	strlist->strlist.set_trace = content_header_stringlist_set_trace;
+	strlist->source = source;
+	strlist->option = option;
+	strlist->params = params;
+
+	if ( option != EXT_MIME_OPTION_PARAM ) {
+		/* One header can have multiple parameters, so we cannot rely
+		   on the source length for the :param option. */
+		strlist->strlist.get_length = content_header_stringlist_get_length;
+	}
+
+	return &strlist->strlist;
+}
+
+/* Implementation */
+
+static inline int _decode_hex_digit(const unsigned char digit)
+{
+	switch ( digit ) {
+	case '0': case '1': case '2': case '3': case '4':
+	case '5': case '6': case '7': case '8': case '9':
+		return digit - '0';
+
+	case 'a': case 'b': case 'c': case 'd': case 'e': case 'f':
+		return digit - 'a' + 0x0a;
+
+	case 'A': case 'B': case 'C': case 'D': case 'E': case 'F':
+		return digit - 'A' + 0x0A;
+	}
+	return -1;
+}
+
+static string_t *
+content_type_param_decode(const char *value)
+{
+	const unsigned char *p, *plast;
+
+	string_t *str = t_str_new(64);
+	plast = p = (const unsigned char *)value;
+	while ( *p != '\0' ) {
+		unsigned char ch;
+		int digit;
+
+		if ( *p == '%' ) {
+			if ( p - plast > 0 )
+				str_append_data(str, plast, (p - plast));
+			p++;
+			if ( *p == '\0' || (digit=_decode_hex_digit(*p)) < 0 )
+				return NULL;
+			ch = (unsigned char)digit;
+			p++;
+			if ( *p == '\0' || (digit=_decode_hex_digit(*p)) < 0 )
+				return NULL;
+			ch = (ch << 4) + (unsigned char)digit;
+			str_append_data(str, &ch, 1);
+			plast = p + 1;
+		}
+		p++;
+	}
+	if ( p - plast > 0 )
+		str_append_data(str, plast, (p - plast));
+	return str;
+}
+
+static string_t *
+content_type_param_next(struct content_header_stringlist *strlist)
+{	
+	const struct sieve_runtime_env *renv = strlist->strlist.runenv;
+	const char *const *values = strlist->param_values;
+	bool trace = strlist->strlist.trace;
+
+	i_assert( strlist->params != NULL );
+
+	/* Iterate over all parsed parameter values */
+	for ( ; *values != NULL; values += 2 ) {
+		const char *const *params = strlist->params;
+		const char *name = values[0], *value = values[1];
+		size_t nlen = strlen(name);
+
+		/* Iterate over all interesting parameter names */
+		for ( ; *params != NULL; params++ ) {
+			size_t plen = strlen(*params);
+
+			if ( plen != nlen &&
+				(nlen != plen + 1 || name[nlen-1] != '*') )
+				continue;
+
+			if ( plen == nlen ) {
+				if ( strcasecmp(name, *params) == 0 ) {
+					/* Return raw value */
+					if ( trace ) {
+						sieve_runtime_trace(renv, 0,
+							"found mime parameter `%s' in mime header",
+							*params);
+					}
+
+					strlist->param_values = values + 2;
+					return t_str_new_const(value, strlen(value));
+				}
+			} else {
+				if ( trace ) {
+					sieve_runtime_trace(renv, 0,
+						"found encoded parameter `%s' in mime header",
+						*params);
+				}
+
+				if ( strncasecmp(name, *params, plen) == 0 ) {
+					string_t *result = NULL;
+
+					strlist->param_values = values + 2;
+
+					/* Decode value first */
+					// FIXME: transcode charset
+					value = strchr(value, '\'');
+					if (value != NULL)
+						value = strchr(value+1, '\'');
+					if (value != NULL)
+						result = content_type_param_decode(value + 1);
+					if (result == NULL)
+						strlist->param_values = NULL;
+					return result;
+				}
+			}
+		}
+	}
+
+	strlist->param_values = NULL;
+	return NULL;
+}
+
+// FIXME: not too happy with the use of string_t like this.
+// Sieve should have a special runtime string type (TODO)
+static string_t *
+content_header_parse(struct content_header_stringlist *strlist,
+	const char *hdr_name, string_t *str)
+{
+	const struct sieve_runtime_env *renv = strlist->strlist.runenv;
+	bool trace = strlist->strlist.trace;
+	struct rfc822_parser_context parser;
+	const char *type, *p;
+	bool is_ctype = FALSE;
+	string_t *content;
+
+	if ( strlist->option == EXT_MIME_OPTION_NONE )
+		return str;
+
+	if ( strcasecmp(hdr_name, "content-type") == 0 )
+		is_ctype = TRUE;
+	else if ( strcasecmp(hdr_name, "content-disposition") != 0 ) {
+		if ( trace ) {
+			sieve_runtime_trace(renv, 0,
+				"non-mime header yields empty string");
+		}
+		return t_str_new(0);
+	}
+
+	/* Initialize parsing */
+	rfc822_parser_init(&parser, str_data(str), str_len(str), NULL);
+	(void)rfc822_skip_lwsp(&parser);
+
+	/* Parse content type/disposition */
+	content = t_str_new(64);
+	if ( is_ctype ){ 
+		if (rfc822_parse_content_type(&parser, content) < 0) {
+			str_truncate(content, 0);
+			return content;
+		}
+	} else {
+		if (rfc822_parse_mime_token(&parser, content) < 0) {
+			str_truncate(content, 0);
+			return content;
+		}
+	}
+
+	/* Content-type value must end here, otherwise it is invalid after all */
+	(void)rfc822_skip_lwsp(&parser);
+	if ( parser.data != parser.end && *parser.data != ';' ) {
+		str_truncate(content, 0);
+		return content;
+	}
+
+	if ( strlist->option == EXT_MIME_OPTION_PARAM ) {
+		string_t *param_val;
+
+		/* MIME parameter */
+		i_assert( strlist->params != NULL );
+
+		// FIXME: not very nice when multiple parameters in the same header
+		// are queried in successive tests.
+		str_truncate(content, 0);
+		rfc2231_parse(&parser, &strlist->param_values);
+
+		param_val = content_type_param_next(strlist);
+		if ( param_val != NULL )
+			content = param_val;
+	} else {
+		/* Get :type/:subtype:/:contenttype value */
+		type = str_c(content);
+		p = strchr(type, '/');
+		switch ( strlist->option ) {
+		case EXT_MIME_OPTION_TYPE:
+			if ( trace ) {
+				sieve_runtime_trace(renv, 0,
+					"extracted MIME type");
+			}
+			if ( p != NULL ) {
+				i_assert( is_ctype );
+				str_truncate(content, (p - type));
+			}
+			break;	
+		case EXT_MIME_OPTION_SUBTYPE:
+			if ( p == NULL ) {
+				i_assert( !is_ctype );
+				if ( trace ) {
+					sieve_runtime_trace(renv, 0,
+						"no MIME sub-type for content-disposition");
+				}
+				str_truncate(content, 0);
+				break;
+			}
+
+			i_assert( is_ctype );
+			if ( trace ) {
+				sieve_runtime_trace(renv, 0,
+					"extracted MIME sub-type");
+			}
+			str_delete(content, 0, (p - type) + 1);
+			break;	
+		case EXT_MIME_OPTION_CONTENTTYPE:
+			sieve_runtime_trace(renv, 0,
+				"extracted full MIME contenttype");
+			break;
+		default:
+			break;
+		}
+	}
+
+	/* Success */
+	return content;
+}
+
+static int content_header_stringlist_next_item
+(struct sieve_stringlist *_strlist, string_t **str_r)
+{
+	struct content_header_stringlist *strlist =
+		(struct content_header_stringlist *)_strlist;
+	const char *hdr_name;
+	int ret;
+
+	if ( strlist->param_values != NULL ) {
+		string_t *param_val;
+
+		i_assert( strlist->option == EXT_MIME_OPTION_PARAM );
+		param_val = content_type_param_next(strlist);
+		if ( param_val != NULL ) {
+			*str_r = param_val;
+			return 1;
+		}
+	}
+
+	if ( (ret=sieve_header_list_next_item
+		(strlist->source, &hdr_name, str_r)) <= 0 ) {
+		if (ret < 0) {
+			_strlist->exec_status =
+				strlist->source->strlist.exec_status;
+		}
+		return ret;
+	}
+
+	*str_r = content_header_parse(strlist, hdr_name, *str_r);
+	return 1;
+}
+
+static void content_header_stringlist_reset
+(struct sieve_stringlist *_strlist)
+{
+	struct content_header_stringlist *strlist =
+		(struct content_header_stringlist *)_strlist;
+	sieve_header_list_reset(strlist->source);
+}
+
+static int content_header_stringlist_get_length
+(struct sieve_stringlist *_strlist)
+{
+	struct content_header_stringlist *strlist =
+		(struct content_header_stringlist *)_strlist;
+	return sieve_header_list_get_length(strlist->source);
+}
+
+static void content_header_stringlist_set_trace
+(struct sieve_stringlist *_strlist, bool trace)
+{
+	struct content_header_stringlist *strlist =
+		(struct content_header_stringlist *)_strlist;
+	sieve_header_list_set_trace(strlist->source, trace);
+}
+
+/*
+ * Header override implementation
+ */
+
+/* Context data */
+
+struct svmo_mime_context {
+	enum ext_mime_option mimeopt;
+	const char *const *params;
+	bool anychild:1;
+};
+
+/* Context coding */
+
+static bool svmo_mime_dump_context
+(const struct sieve_message_override *svmo ATTR_UNUSED,
+	const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	unsigned int anychild, mimeopt;
+
+	if ( !sieve_binary_read_byte(denv->sblock, address, &anychild) )
+		return FALSE;
+	if ( anychild > 0 )
+		sieve_code_dumpf(denv, "anychild");
+
+	if ( !sieve_binary_read_byte(denv->sblock, address, &mimeopt) )
+		return FALSE;
+
+	switch ( mimeopt ) {
+	case EXT_MIME_OPTION_NONE:
+		break;
+	case EXT_MIME_OPTION_TYPE:
+		sieve_code_dumpf(denv, "option: type");
+		break;
+	case EXT_MIME_OPTION_SUBTYPE:
+		sieve_code_dumpf(denv, "option: subtype");
+		break;
+	case EXT_MIME_OPTION_CONTENTTYPE:
+		sieve_code_dumpf(denv, "option: contenttype");
+		break;
+	case EXT_MIME_OPTION_PARAM:
+		sieve_code_dumpf(denv, "option: param");
+		sieve_code_descend(denv);
+		if ( !sieve_opr_stringlist_dump(denv, address, "param-list") )
+			return FALSE;
+		sieve_code_ascend(denv);
+		break;
+	default:
+		return FALSE;
+	}
+	return TRUE;
+}
+
+static int svmo_mime_read_context
+(const struct sieve_message_override *svmo ATTR_UNUSED,
+	const struct sieve_runtime_env *renv, sieve_size_t *address,
+	void **ho_context)
+{
+	pool_t pool = sieve_result_pool(renv->result); // FIXME: investigate
+	struct svmo_mime_context *ctx;
+	unsigned int anychild = 0, mimeopt = EXT_MIME_OPTION_NONE;
+	struct sieve_stringlist *param_list = NULL;
+	int ret;
+
+	if ( !sieve_binary_read_byte
+		(renv->sblock, address, &anychild) ) {
+		sieve_runtime_trace_error(renv,
+			"anychild: invalid byte");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	if ( !sieve_binary_read_byte
+		(renv->sblock, address, &mimeopt) ||
+		mimeopt > EXT_MIME_OPTION_PARAM ) {
+		sieve_runtime_trace_error(renv,
+			"option: invalid mime option code");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	if ( mimeopt == EXT_MIME_OPTION_PARAM &&
+		(ret=sieve_opr_stringlist_read
+			(renv, address, "param-list", &param_list)) <= 0 )
+		return ret;
+
+	ctx = p_new(pool, struct svmo_mime_context, 1);
+	ctx->anychild = (anychild == 0 ? FALSE : TRUE);
+	ctx->mimeopt = (enum ext_mime_option)mimeopt;
+
+	if ( param_list != NULL && sieve_stringlist_read_all
+		(param_list, pool, &ctx->params) < 0 ) {
+		sieve_runtime_trace_error(renv,
+			"failed to read param-list operand");
+		return param_list->exec_status;
+	}
+
+	*ho_context = (void *) ctx;
+	return SIEVE_EXEC_OK;
+}
+
+/* Override */
+
+static int svmo_mime_header_override
+(const struct sieve_message_override *svmo,
+	const struct sieve_runtime_env *renv, bool mime_decode,
+	struct sieve_stringlist **headers_r)
+{
+	struct svmo_mime_context *ctx =
+		(struct svmo_mime_context *)svmo->context;
+	struct ext_foreverypart_runtime_loop *sfploop;
+	struct sieve_header_list *headers;
+	struct sieve_stringlist *values;
+	int ret;
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_MATCHING,
+		"header mime override:");
+	sieve_runtime_trace_descend(renv);
+
+	if ( ctx->anychild ) {
+		sieve_runtime_trace(renv, SIEVE_TRLVL_MATCHING,
+			"headers from current mime part and children");
+	} else {
+		sieve_runtime_trace(renv, SIEVE_TRLVL_MATCHING,
+			"headers from current mime part");
+	}
+
+	sfploop = ext_foreverypart_runtime_loop_get_current(renv);
+	if ( sfploop != NULL ) {
+		headers = sieve_mime_header_list_create
+			(renv, *headers_r, &sfploop->part_iter,
+				mime_decode, ctx->anychild);
+	} else if ( ctx->anychild ) {
+		struct sieve_message_part_iter part_iter;
+
+		if ( (ret=sieve_message_part_iter_init
+			(&part_iter, renv)) <= 0 )
+			return ret;
+
+		headers = sieve_mime_header_list_create
+			(renv, *headers_r, &part_iter, mime_decode, TRUE);
+	} else {
+		headers = sieve_message_header_list_create
+			(renv, *headers_r, mime_decode);
+	}
+	values = &headers->strlist;
+
+	switch ( ctx->mimeopt ) {
+	case EXT_MIME_OPTION_NONE:
+		break;
+	case EXT_MIME_OPTION_TYPE:
+		sieve_runtime_trace(renv, SIEVE_TRLVL_MATCHING,
+			"extract mime type from header value");
+		break;
+	case EXT_MIME_OPTION_SUBTYPE:
+		sieve_runtime_trace(renv, SIEVE_TRLVL_MATCHING,
+			"extract mime subtype from header value");
+		break;
+	case EXT_MIME_OPTION_CONTENTTYPE:
+		sieve_runtime_trace(renv, SIEVE_TRLVL_MATCHING,
+			"extract mime contenttype from header value");
+		break;
+	case EXT_MIME_OPTION_PARAM:
+		sieve_runtime_trace(renv, SIEVE_TRLVL_MATCHING,
+			"extract mime parameters from header value");
+		break;
+	default:
+		i_unreached();
+	}
+
+	if ( ctx->mimeopt != EXT_MIME_OPTION_NONE ) {
+		values = content_header_stringlist_create
+			(renv, headers, ctx->mimeopt, ctx->params);
+	}
+	*headers_r = values;
+
+	sieve_runtime_trace_ascend(renv);
+	return SIEVE_EXEC_OK;
+}
+
diff --git a/pigeonhole/src/lib-sieve/plugins/notify/Makefile.am b/pigeonhole/src/lib-sieve/plugins/notify/Makefile.am
new file mode 100644
index 0000000..aaa76b3
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/notify/Makefile.am
@@ -0,0 +1,20 @@
+noinst_LTLIBRARIES = libsieve_ext_notify.la
+
+AM_CPPFLAGS = \
+	-I$(srcdir)/../.. \
+	-I$(srcdir)/../../util \
+	$(LIBDOVECOT_INCLUDE)
+
+commands = \
+	cmd-notify.c \
+	cmd-denotify.c
+
+libsieve_ext_notify_la_SOURCES = \
+	ext-notify.c \
+	ext-notify-common.c \
+	$(commands)
+
+noinst_HEADERS = \
+	ext-notify-common.h \
+	ext-notify-limits.h
+
diff --git a/pigeonhole/src/lib-sieve/plugins/notify/Makefile.in b/pigeonhole/src/lib-sieve/plugins/notify/Makefile.in
new file mode 100644
index 0000000..910007d
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/notify/Makefile.in
@@ -0,0 +1,699 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
+              "target option '$${target_option-}' specified" >&2; \
+         exit 1;; \
+  esac; \
+  has_opt=no; \
+  sane_makeflags=$$MAKEFLAGS; \
+  if $(am__is_gnu_make); then \
+    sane_makeflags=$$MFLAGS; \
+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
+        bs=\\; \
+        sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \
+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+  }; \
+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
+    case $$flg in \
+      *=*|--*) continue;; \
+        -*I) strip_trailopt 'I'; skip_next=yes;; \
+      -*I?*) strip_trailopt 'I';; \
+        -*O) strip_trailopt 'O'; skip_next=yes;; \
+      -*O?*) strip_trailopt 'O';; \
+        -*l) strip_trailopt 'l'; skip_next=yes;; \
+      -*l?*) strip_trailopt 'l';; \
+      -[dEDm]) skip_next=yes;; \
+      -[JT]) skip_next=yes;; \
+    esac; \
+    case $$flg in \
+      *$$target_option*) has_opt=yes; break;; \
+    esac; \
+  done; \
+  test $$has_opt = yes
+am__make_dryrun = (target_option=n; $(am__make_running_with_option))
+am__make_keepgoing = (target_option=k; $(am__make_running_with_option))
+pkgdatadir = $(datadir)/@PACKAGE@
+pkgincludedir = $(includedir)/@PACKAGE@
+pkglibdir = $(libdir)/@PACKAGE@
+pkglibexecdir = $(libexecdir)/@PACKAGE@
+am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd
+install_sh_DATA = $(install_sh) -c -m 644
+install_sh_PROGRAM = $(install_sh) -c
+install_sh_SCRIPT = $(install_sh) -c
+INSTALL_HEADER = $(INSTALL_DATA)
+transform = $(program_transform_name)
+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
+PRE_UNINSTALL = :
+POST_UNINSTALL = :
+build_triplet = @build@
+host_triplet = @host@
+subdir = src/lib-sieve/plugins/notify
+ACLOCAL_M4 = $(top_srcdir)/aclocal.m4
+am__aclocal_m4_deps = $(top_srcdir)/m4/dovecot.m4 \
+	$(top_srcdir)/m4/libtool.m4 $(top_srcdir)/m4/ltoptions.m4 \
+	$(top_srcdir)/m4/ltsugar.m4 $(top_srcdir)/m4/ltversion.m4 \
+	$(top_srcdir)/m4/lt~obsolete.m4 $(top_srcdir)/configure.ac
+am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
+	$(ACLOCAL_M4)
+DIST_COMMON = $(srcdir)/Makefile.am $(noinst_HEADERS) \
+	$(am__DIST_COMMON)
+mkinstalldirs = $(install_sh) -d
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+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/cmd-denotify.Plo
+	-rm -f ./$(DEPDIR)/cmd-notify.Plo
+	-rm -f ./$(DEPDIR)/ext-notify-common.Plo
+	-rm -f ./$(DEPDIR)/ext-notify.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/cmd-denotify.Plo
+	-rm -f ./$(DEPDIR)/cmd-notify.Plo
+	-rm -f ./$(DEPDIR)/ext-notify-common.Plo
+	-rm -f ./$(DEPDIR)/ext-notify.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/notify/cmd-denotify.c b/pigeonhole/src/lib-sieve/plugins/notify/cmd-denotify.c
new file mode 100644
index 0000000..8769808
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/notify/cmd-denotify.c
@@ -0,0 +1,389 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+
+#include "sieve-common.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-ast.h"
+#include "sieve-commands.h"
+#include "sieve-match-types.h"
+#include "sieve-comparators.h"
+#include "sieve-match.h"
+#include "sieve-actions.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-result.h"
+
+#include "ext-notify-common.h"
+
+/*
+ * Denotify command
+ *
+ * Syntax:
+ *   denotify [MATCH-TYPE string] [<":low" / ":normal" / ":high">]
+ */
+
+static bool cmd_denotify_registered
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+static bool cmd_denotify_pre_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool cmd_denotify_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool cmd_denotify_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd);
+
+const struct sieve_command_def cmd_denotify = {
+	.identifier = "denotify",
+	.type = SCT_COMMAND,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = cmd_denotify_registered,
+	.pre_validate = cmd_denotify_pre_validate,
+	.validate = cmd_denotify_validate,
+	.generate = cmd_denotify_generate
+};
+
+/*
+ * Tagged arguments
+ */
+
+/* Forward declarations */
+
+static bool tag_match_type_is_instance_of
+	(struct sieve_validator *validator, struct sieve_command *cmd,
+		const struct sieve_extension *ext, const char *identifier, void **data);
+static bool tag_match_type_validate
+	(struct sieve_validator *validator, struct sieve_ast_argument **arg,
+		struct sieve_command *cmd);
+
+/* Argument object */
+
+const struct sieve_argument_def denotify_match_tag = {
+	.identifier = "MATCH-TYPE-STRING",
+	.is_instance_of = tag_match_type_is_instance_of,
+	.validate = tag_match_type_validate
+};
+
+/* Codes for optional operands */
+
+enum cmd_denotify_optional {
+	OPT_END,
+	OPT_IMPORTANCE,
+	OPT_MATCH_TYPE,
+	OPT_MATCH_KEY
+};
+
+/*
+ * Denotify operation
+ */
+
+static bool cmd_denotify_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int cmd_denotify_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def denotify_operation = {
+	.mnemonic = "DENOTIFY",
+	.ext_def = &notify_extension,
+	.code = EXT_NOTIFY_OPERATION_DENOTIFY,
+	.dump = cmd_denotify_operation_dump,
+	.execute = cmd_denotify_operation_execute
+};
+
+/*
+ * Command validation context
+ */
+
+struct cmd_denotify_context_data {
+	struct sieve_ast_argument *match_key_arg;
+};
+
+/*
+ * Tag validation
+ */
+
+static bool tag_match_type_is_instance_of
+(struct sieve_validator *valdtr, struct sieve_command *cmd,
+	const struct sieve_extension *ext, const char *identifier, void **data)
+{
+	return match_type_tag.is_instance_of(valdtr, cmd, ext, identifier, data);
+}
+
+static bool tag_match_type_validate
+(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+	struct sieve_command *cmd)
+{
+	struct cmd_denotify_context_data *cmd_data =
+        (struct cmd_denotify_context_data *) cmd->data;
+	struct sieve_ast_argument *tag = *arg;
+
+	i_assert(tag != NULL);
+
+	if ( !match_type_tag.validate(valdtr, arg, cmd) )
+		return FALSE;
+
+	if ( *arg == NULL ) {
+		sieve_argument_validate_error(valdtr, tag,
+			"the MATCH-TYPE argument (:%s) for the denotify command requires "
+			"an additional key-string parameter, but no more arguments were found",
+			sieve_ast_argument_tag(tag));
+		return FALSE;
+	}
+
+	if ( sieve_ast_argument_type(*arg) != SAAT_STRING )
+	{
+		sieve_argument_validate_error(valdtr, *arg,
+			"the MATCH-TYPE argument (:%s) for the denotify command requires "
+			"an additional key-string parameter, but %s was found",
+			sieve_ast_argument_tag(tag), sieve_ast_argument_name(*arg));
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, cmd, *arg, FALSE) )
+		return FALSE;
+
+	tag->argument->def = &match_type_tag;
+	tag->argument->ext = NULL;
+
+	(*arg)->argument->id_code = OPT_MATCH_KEY;
+	cmd_data->match_key_arg = *arg;
+
+	*arg = sieve_ast_argument_next(*arg);
+
+	return TRUE;
+}
+
+/*
+ * Command registration
+ */
+
+static bool cmd_denotify_registered
+(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+	struct sieve_command_registration *cmd_reg)
+{
+	sieve_validator_register_tag
+		(valdtr, cmd_reg, ext, &denotify_match_tag, OPT_MATCH_TYPE);
+
+	ext_notify_register_importance_tags(valdtr, cmd_reg, ext, OPT_IMPORTANCE);
+
+	return TRUE;
+}
+
+/*
+ * Command validation
+ */
+
+static bool cmd_denotify_pre_validate
+(struct sieve_validator *valdtr ATTR_UNUSED,
+	struct sieve_command *cmd)
+{
+	struct cmd_denotify_context_data *ctx_data;
+
+	/* Assign context */
+	ctx_data = p_new(sieve_command_pool(cmd),
+		struct cmd_denotify_context_data, 1);
+	cmd->data = (void *) ctx_data;
+
+	return TRUE;
+}
+
+static bool cmd_denotify_validate
+(struct sieve_validator *valdtr, struct sieve_command *cmd)
+{
+    struct cmd_denotify_context_data *ctx_data =
+        (struct cmd_denotify_context_data *) cmd->data;
+	struct sieve_ast_argument *key_arg = ctx_data->match_key_arg;
+	const struct sieve_match_type mcht_default =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	const struct sieve_comparator cmp_default =
+		SIEVE_COMPARATOR_DEFAULT(i_octet_comparator);
+
+	if ( key_arg != NULL ) {
+		if ( !sieve_match_type_validate
+			(valdtr, cmd, key_arg, &mcht_default, &cmp_default) )
+			return FALSE;
+	}
+
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool cmd_denotify_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &denotify_operation);
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, cmd, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool cmd_denotify_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	const struct sieve_operation *op = denv->oprtn;
+	int opt_code = 0;
+
+	sieve_code_dumpf(denv, "%s", sieve_operation_mnemonic(op));
+	sieve_code_descend(denv);
+
+	for (;;) {
+		int opt;
+		bool opok = TRUE;
+
+		if ( (opt=sieve_opr_optional_dump(denv, address, &opt_code)) < 0 )
+			return FALSE;
+
+		if ( opt == 0 ) break;
+
+		switch ( opt_code ) {
+		case OPT_MATCH_KEY:
+			opok = sieve_opr_string_dump(denv, address, "key-string");
+			break;
+		case OPT_MATCH_TYPE:
+			opok = sieve_opr_match_type_dump(denv, address);
+			break;
+		case OPT_IMPORTANCE:
+			opok = sieve_opr_number_dump(denv, address, "importance");
+			break;
+		default:
+			return FALSE;
+		}
+
+		if ( !opok ) return FALSE;
+	}
+
+	return TRUE;
+}
+
+/*
+ * Code execution
+ */
+
+static int cmd_denotify_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	int opt_code = 0;
+	struct sieve_match_type mcht =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	const struct sieve_comparator cmp =
+		SIEVE_COMPARATOR_DEFAULT(i_octet_comparator);
+	struct sieve_stringlist *match_key = NULL;
+	sieve_number_t importance = 0;
+	struct sieve_match_context *mctx;
+	struct sieve_result_iterate_context *rictx;
+	const struct sieve_action *action;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Optional operands */
+
+	for (;;) {
+		int opt;
+
+		if ( (opt=sieve_opr_optional_read(renv, address, &opt_code)) < 0 )
+			return SIEVE_EXEC_BIN_CORRUPT;
+
+		if ( opt == 0 ) break;
+
+		switch ( opt_code ) {
+		case OPT_MATCH_TYPE:
+			ret = sieve_opr_match_type_read(renv, address, &mcht);
+			break;
+		case OPT_MATCH_KEY:
+			ret = sieve_opr_stringlist_read(renv, address, "match key", &match_key);
+			break;
+		case OPT_IMPORTANCE:
+			ret = sieve_opr_number_read(renv, address, "importance", &importance);
+			break;
+		default:
+			sieve_runtime_trace_error(renv, "unknown optional operand");
+			return SIEVE_EXEC_BIN_CORRUPT;
+		}
+
+		if ( ret <= 0 ) return ret;
+	}
+
+	/*
+	 * Perform operation
+	 */
+
+	/* Enforce 0 < importance < 4 (just to be sure) */
+
+	if ( importance < 1 )
+		importance = 1;
+	else if ( importance > 3 )
+		importance = 3;
+
+	/* Trace */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_ACTIONS, "denotify action");
+
+	/* Either do string matching or just kill all notify actions */
+	if ( match_key != NULL ) {
+		/* Initialize match */
+		mctx = sieve_match_begin(renv, &mcht, &cmp);
+
+		/* Iterate through all notify actions and delete those that match */
+		rictx = sieve_result_iterate_init(renv->result);
+
+		while ( (action=sieve_result_iterate_next(rictx, NULL)) != NULL ) {
+			if ( sieve_action_is(action, act_notify_old) ) {
+				struct ext_notify_action *nact =
+					(struct ext_notify_action *) action->context;
+
+				if ( importance == 0 || nact->importance == importance ) {
+					int match;
+
+					if ( (match=sieve_match_value
+						(mctx, nact->id, strlen(nact->id), match_key)) < 0 )
+						break;
+
+					if ( match > 0 )
+						sieve_result_iterate_delete(rictx);
+				}
+			}
+		}
+
+		/* Finish match */
+		if ( sieve_match_end(&mctx, &ret) < 0 )
+			return ret;
+
+	} else {
+		/* Delete all notify actions */
+		rictx = sieve_result_iterate_init(renv->result);
+
+		while ( (action=sieve_result_iterate_next(rictx, NULL)) != NULL ) {
+
+			if ( sieve_action_is(action, act_notify_old) ) {
+				struct ext_notify_action *nact =
+					(struct ext_notify_action *) action->context;
+
+				if ( importance == 0 || nact->importance == importance )
+					sieve_result_iterate_delete(rictx);
+			}
+		}
+	}
+
+	return SIEVE_EXEC_OK;
+}
+
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/notify/cmd-notify.c b/pigeonhole/src/lib-sieve/plugins/notify/cmd-notify.c
new file mode 100644
index 0000000..a683c31
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/notify/cmd-notify.c
@@ -0,0 +1,900 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "array.h"
+#include "str.h"
+#include "ioloop.h"
+#include "str-sanitize.h"
+#include "ostream.h"
+#include "message-date.h"
+#include "mail-storage.h"
+
+#include "rfc2822.h"
+
+#include "sieve-common.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-actions.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-result.h"
+#include "sieve-address.h"
+#include "sieve-message.h"
+#include "sieve-smtp.h"
+
+#include "ext-notify-common.h"
+#include "ext-notify-limits.h"
+
+#include <ctype.h>
+
+/* Notify command (DEPRECATED)
+ *
+ * Syntax:
+ *   notify [":method" string] [":id" string] [":options" string-list]
+ *          [<":low" / ":normal" / ":high">] ["message:" string]
+ *
+ */
+
+static bool
+cmd_notify_registered(struct sieve_validator *valdtr,
+		      const struct sieve_extension *ext,
+		      struct sieve_command_registration *cmd_reg);
+static bool
+cmd_notify_pre_validate(struct sieve_validator *valdtr,
+			struct sieve_command *cmd);
+static bool
+cmd_notify_validate(struct sieve_validator *valdtr,
+		    struct sieve_command *cmd);
+static bool
+cmd_notify_generate(const struct sieve_codegen_env *cgenv,
+		    struct sieve_command *ctx);
+
+const struct sieve_command_def cmd_notify_old = {
+	.identifier = "notify",
+	.type = SCT_COMMAND,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = cmd_notify_registered,
+	.pre_validate = cmd_notify_pre_validate,
+	.validate = cmd_notify_validate,
+	.generate = cmd_notify_generate
+};
+
+/*
+ * Tagged arguments
+ */
+
+/* Forward declarations */
+
+static bool
+cmd_notify_validate_string_tag(struct sieve_validator *valdtr,
+			       struct sieve_ast_argument **arg,
+			       struct sieve_command *cmd);
+static bool
+cmd_notify_validate_stringlist_tag(struct sieve_validator *valdtr,
+				   struct sieve_ast_argument **arg,
+				   struct sieve_command *cmd);
+
+/* Argument objects */
+
+static const struct sieve_argument_def notify_method_tag = {
+	.identifier = "method",
+	.validate = cmd_notify_validate_string_tag
+};
+
+static const struct sieve_argument_def notify_options_tag = {
+	.identifier = "options",
+	.validate = cmd_notify_validate_stringlist_tag
+};
+
+static const struct sieve_argument_def notify_id_tag = {
+	.identifier = "id",
+	.validate = cmd_notify_validate_string_tag
+};
+
+static const struct sieve_argument_def notify_message_tag = {
+	.identifier = "message",
+	.validate = cmd_notify_validate_string_tag
+};
+
+/*
+ * Notify operation
+ */
+
+static bool
+cmd_notify_operation_dump(const struct sieve_dumptime_env *denv,
+			  sieve_size_t *address);
+static int
+cmd_notify_operation_execute(const struct sieve_runtime_env *renv,
+			     sieve_size_t *address);
+
+const struct sieve_operation_def notify_old_operation = {
+	.mnemonic = "NOTIFY",
+	.ext_def = &notify_extension,
+	.code = EXT_NOTIFY_OPERATION_NOTIFY,
+	.dump = cmd_notify_operation_dump,
+	.execute = cmd_notify_operation_execute
+};
+
+/* Codes for optional operands */
+
+enum cmd_notify_optional {
+  OPT_END,
+  OPT_MESSAGE,
+  OPT_IMPORTANCE,
+  OPT_OPTIONS,
+  OPT_ID
+};
+
+/*
+ * Notify action
+ */
+
+/* Forward declarations */
+
+static int
+act_notify_check_duplicate(const struct sieve_runtime_env *renv,
+			   const struct sieve_action *act,
+			   const struct sieve_action *act_other);
+static void
+act_notify_print(const struct sieve_action *action,
+		 const struct sieve_result_print_env *rpenv, bool *keep);
+static int
+act_notify_commit(const struct sieve_action_exec_env *aenv,
+		  void *tr_context);
+
+/* Action object */
+
+const struct sieve_action_def act_notify_old = {
+	.name = "notify",
+	.check_duplicate = act_notify_check_duplicate,
+	.print = act_notify_print,
+	.commit = act_notify_commit
+};
+
+/*
+ * Command validation context
+ */
+
+struct cmd_notify_context_data {
+	struct sieve_ast_argument *id;
+	struct sieve_ast_argument *method;
+	struct sieve_ast_argument *options;
+	struct sieve_ast_argument *message;
+};
+
+/*
+ * Tag validation
+ */
+
+static bool
+cmd_notify_validate_string_tag(struct sieve_validator *valdtr,
+			       struct sieve_ast_argument **arg,
+			       struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+	struct cmd_notify_context_data *ctx_data =
+		(struct cmd_notify_context_data *)cmd->data;
+
+	/* Detach the tag itself */
+	*arg = sieve_ast_arguments_detach(*arg, 1);
+
+	/* Check syntax:
+	 *   :id <string>
+	 *   :method <string>
+	 *   :message <string>
+	 */
+	if (!sieve_validate_tag_parameter(valdtr, cmd, tag, *arg, NULL, 0,
+					  SAAT_STRING, FALSE))
+		return FALSE;
+
+	if (sieve_argument_is(tag, notify_method_tag)) {
+		ctx_data->method = *arg;
+
+		/* Removed */
+		*arg = sieve_ast_arguments_detach(*arg, 1);
+	} else if (sieve_argument_is(tag, notify_id_tag)) {
+		ctx_data->id = *arg;
+
+		/* Skip parameter */
+		*arg = sieve_ast_argument_next(*arg);
+	} else if (sieve_argument_is(tag, notify_message_tag)) {
+		ctx_data->message = *arg;
+
+		/* Skip parameter */
+		*arg = sieve_ast_argument_next(*arg);
+	}
+	return TRUE;
+}
+
+static bool
+cmd_notify_validate_stringlist_tag(struct sieve_validator *valdtr,
+				   struct sieve_ast_argument **arg,
+				   struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+	struct cmd_notify_context_data *ctx_data =
+		(struct cmd_notify_context_data *)cmd->data;
+
+	/* Detach the tag itself */
+	*arg = sieve_ast_arguments_detach(*arg,1);
+
+	/* Check syntax:
+	 *   :options string-list
+	 */
+	if (!sieve_validate_tag_parameter(valdtr, cmd, tag, *arg, NULL, 0,
+					  SAAT_STRING_LIST, FALSE))
+		return FALSE;
+
+	/* Assign context */
+	ctx_data->options = *arg;
+
+	/* Skip parameter */
+	*arg = sieve_ast_argument_next(*arg);
+
+	return TRUE;
+}
+
+/*
+ * Command registration
+ */
+
+static bool
+cmd_notify_registered(struct sieve_validator *valdtr,
+		      const struct sieve_extension *ext,
+		      struct sieve_command_registration *cmd_reg)
+{
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &notify_method_tag, 0);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &notify_id_tag, OPT_ID);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &notify_message_tag, OPT_MESSAGE);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &notify_options_tag, OPT_OPTIONS);
+
+	ext_notify_register_importance_tags(valdtr, cmd_reg, ext,
+					    OPT_IMPORTANCE);
+
+	return TRUE;
+}
+
+/*
+ * Command validation
+ */
+
+static bool
+cmd_notify_pre_validate(struct sieve_validator *valdtr ATTR_UNUSED,
+			struct sieve_command *cmd)
+{
+	struct cmd_notify_context_data *ctx_data;
+
+	/* Create context */
+	ctx_data = p_new(sieve_command_pool(cmd),
+			 struct cmd_notify_context_data, 1);
+	cmd->data = ctx_data;
+
+	return TRUE;
+}
+
+static int
+cmd_notify_address_validate(void *context, struct sieve_ast_argument *arg)
+{
+	struct sieve_validator *valdtr = (struct sieve_validator *)context;
+
+	if (sieve_argument_is_string_literal(arg)) {
+		string_t *address = sieve_ast_argument_str(arg);
+		const char *error;
+		int result;
+
+		T_BEGIN {
+			result = (sieve_address_validate_str(address, &error) ?
+				  1 : -1);
+
+			if (result <= 0) {
+				sieve_argument_validate_error(
+					valdtr, arg,
+					"specified :options address '%s' is invalid for "
+					"the mailto notify method: %s",
+					str_sanitize(str_c(address), 128),
+					error);
+			}
+		} T_END;
+
+		return result;
+	}
+
+	return 1;
+}
+
+static bool
+cmd_notify_validate(struct sieve_validator *valdtr, struct sieve_command *cmd)
+{
+	struct cmd_notify_context_data *ctx_data =
+		(struct cmd_notify_context_data *)cmd->data;
+
+	/* Check :method argument */
+	if (ctx_data->method != NULL)	{
+		const char *method = sieve_ast_argument_strc(ctx_data->method);
+
+		if (strcasecmp(method, "mailto") != 0) {
+			sieve_command_validate_error(
+				valdtr, cmd,
+				"the notify command of the deprecated notify extension "
+				"only supports the 'mailto' notification method");
+			return FALSE;
+		}
+	}
+
+	/* Check :options argument */
+	if (ctx_data->options != NULL) {
+		struct sieve_ast_argument *option = ctx_data->options;
+
+		/* Parse and check options */
+		if (sieve_ast_stringlist_map(
+			&option, (void *)valdtr,
+			cmd_notify_address_validate) <= 0) {
+			return FALSE;
+		}
+	} else {
+		sieve_command_validate_warning(
+			valdtr, cmd,
+			"no :options (and hence recipients) specified for the notify command");
+	}
+
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool
+cmd_notify_generate(const struct sieve_codegen_env *cgenv,
+		    struct sieve_command *cmd)
+{
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &notify_old_operation);
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, cmd, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+cmd_notify_operation_dump(const struct sieve_dumptime_env *denv,
+			  sieve_size_t *address)
+{
+	int opt_code = 0;
+
+	sieve_code_dumpf(denv, "NOTIFY");
+	sieve_code_descend(denv);
+
+	/* Dump optional operands */
+	for (;;) {
+		int opt;
+		bool opok = TRUE;
+
+		if ((opt = sieve_opr_optional_dump(denv, address,
+						   &opt_code)) < 0)
+			return FALSE;
+
+		if (opt == 0)
+			break;
+
+		switch (opt_code) {
+		case OPT_IMPORTANCE:
+			opok = sieve_opr_number_dump(denv, address,
+						     "importance");
+			break;
+		case OPT_ID:
+			opok = sieve_opr_string_dump(denv, address,
+						     "id");
+			break;
+		case OPT_OPTIONS:
+			opok = sieve_opr_stringlist_dump(denv, address,
+							 "options");
+			break;
+		case OPT_MESSAGE:
+			opok = sieve_opr_string_dump(denv, address,
+						     "message");
+			break;
+		default:
+			return FALSE;
+		}
+
+		if (!opok)
+			return FALSE;
+	}
+
+	return TRUE;
+}
+
+/*
+ * Code execution
+ */
+
+
+static int
+cmd_notify_operation_execute(const struct sieve_runtime_env *renv,
+			     sieve_size_t *address)
+{
+	const struct sieve_extension *this_ext = renv->oprtn->ext;
+	struct ext_notify_action *act;
+	pool_t pool;
+	int opt_code = 0;
+	sieve_number_t importance = 1;
+	struct sieve_stringlist *options = NULL;
+	string_t *message = NULL, *id = NULL;
+	int ret = 0;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Optional operands */
+
+	for (;;) {
+		int opt;
+
+		if ((opt = sieve_opr_optional_read(renv, address,
+						   &opt_code)) < 0)
+			return SIEVE_EXEC_BIN_CORRUPT;
+
+		if (opt == 0)
+			break;
+
+		switch (opt_code) {
+		case OPT_IMPORTANCE:
+			ret = sieve_opr_number_read(renv, address, "importance",
+						    &importance);
+			break;
+		case OPT_ID:
+			ret = sieve_opr_string_read(renv, address, "id", &id);
+			break;
+		case OPT_MESSAGE:
+			ret = sieve_opr_string_read(renv, address, "from",
+						    &message);
+			break;
+		case OPT_OPTIONS:
+			ret = sieve_opr_stringlist_read(renv, address,
+							"options", &options);
+			break;
+		default:
+			sieve_runtime_trace_error(
+				renv, "unknown optional operand");
+			return SIEVE_EXEC_BIN_CORRUPT;
+		}
+
+		if (ret <= 0) return ret;
+	}
+
+	/*
+	 * Perform operation
+	 */
+
+	/* Enforce 0 < importance < 4 (just to be sure) */
+
+	if (importance < 1)
+		importance = 1;
+	else if (importance > 3)
+		importance = 3;
+
+	/* Trace */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_ACTIONS, "notify action");
+
+	/* Compose action */
+	if (options != NULL) {
+		string_t *raw_address;
+		string_t *out_message;
+
+		pool = sieve_result_pool(renv->result);
+		act = p_new(pool, struct ext_notify_action, 1);
+		if (id != NULL)
+			act->id = p_strdup(pool, str_c(id));
+		act->importance = importance;
+
+		/* Process message */
+
+		out_message = t_str_new(1024);
+		if ((ret = ext_notify_construct_message(
+			renv, (message == NULL ? NULL : str_c(message)),
+			out_message)) <= 0)
+			return ret;
+		act->message = p_strdup(pool, str_c(out_message));
+
+		/* Normalize and verify all :options addresses */
+
+		sieve_stringlist_reset(options);
+
+		p_array_init(&act->recipients, pool, 4);
+
+		raw_address = NULL;
+		while ((ret = sieve_stringlist_next_item(
+			options, &raw_address)) > 0) {
+			const char *error = NULL;
+			const struct smtp_address *address;
+
+			/* Add if valid address */
+			address = sieve_address_parse_str(raw_address, &error);
+			if (address != NULL) {
+				const struct ext_notify_recipient *rcpts;
+				unsigned int rcpt_count, i;
+
+				/* Prevent duplicates */
+				rcpts = array_get(&act->recipients, &rcpt_count);
+
+				for (i = 0; i < rcpt_count; i++) {
+					if (smtp_address_equals(rcpts[i].address,
+								address))
+						break;
+				}
+
+				/* Add only if unique */
+				if (i != rcpt_count) {
+					sieve_runtime_warning(
+						renv, NULL,
+						"duplicate recipient '%s' specified in the :options argument of "
+						"the deprecated notify command",
+						str_sanitize(str_c(raw_address), 128));
+
+				} else if (array_count(&act->recipients) >=
+					EXT_NOTIFY_MAX_RECIPIENTS) {
+					sieve_runtime_warning(renv, NULL,
+						"more than the maximum %u recipients are specified "
+						"for the deprecated notify command; "
+						"the rest is discarded",
+						EXT_NOTIFY_MAX_RECIPIENTS);
+					break;
+
+				} else {
+					struct ext_notify_recipient recipient;
+
+					recipient.full =
+						p_strdup(pool, str_c(raw_address));
+					recipient.address =
+						smtp_address_clone(pool, address);
+
+					array_append(&act->recipients, &recipient, 1);
+				}
+			} else {
+				sieve_runtime_error(
+					renv, NULL,
+					"specified :options address '%s' is invalid for "
+					"the deprecated notify command: %s",
+					str_sanitize(str_c(raw_address), 128), error);
+				return SIEVE_EXEC_FAILURE;
+			}
+		}
+
+		if (ret < 0) {
+			sieve_runtime_trace_error(
+				renv, "invalid options stringlist");
+			return SIEVE_EXEC_BIN_CORRUPT;
+		}
+
+		if (sieve_result_add_action(renv, this_ext, "notify",
+					    &act_notify_old, NULL, (void *)act,
+					    0, FALSE) < 0)
+			return SIEVE_EXEC_FAILURE;
+	}
+
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Action
+ */
+
+/* Runtime verification */
+
+static int
+act_notify_check_duplicate(const struct sieve_runtime_env *renv ATTR_UNUSED,
+			   const struct sieve_action *act ATTR_UNUSED,
+			   const struct sieve_action *act_other ATTR_UNUSED)
+{
+	struct ext_notify_action *new_nact, *old_nact;
+	const struct ext_notify_recipient *new_rcpts;
+	const struct ext_notify_recipient *old_rcpts;
+	unsigned int new_count, old_count, i, j;
+	unsigned int del_start = 0, del_len = 0;
+
+	if (act->context == NULL || act_other->context == NULL)
+		return 0;
+
+	new_nact = (struct ext_notify_action *)act->context;
+	old_nact = (struct ext_notify_action *)act_other->context;
+
+	new_rcpts = array_get(&new_nact->recipients, &new_count);
+	old_rcpts = array_get(&old_nact->recipients, &old_count);
+
+	for (i = 0; i < new_count; i++) {
+		for (j = 0; j < old_count; j++) {
+			if (smtp_address_equals(new_rcpts[i].address,
+						old_rcpts[j].address))
+				break;
+		}
+
+		if (j == old_count) {
+			/* Not duplicate */
+			if (del_len > 0) {
+				/* Perform pending deletion */
+				array_delete(&new_nact->recipients,
+					     del_start, del_len);
+
+				/* Make sure the loop integrity is maintained */
+				i -= del_len;
+				new_rcpts = array_get(&new_nact->recipients,
+						      &new_count);
+			}
+
+			del_len = 0;
+		} else {
+			/* Mark deletion */
+			if (del_len == 0)
+				del_start = i;
+			del_len++;
+		}
+	}
+
+	/* Perform pending deletion */
+	if (del_len > 0)
+		array_delete(&new_nact->recipients, del_start, del_len);
+
+	return (array_count(&new_nact->recipients) > 0 ? 0 : 1);
+}
+
+/* Result printing */
+
+static void
+act_notify_print(const struct sieve_action *action,
+		 const struct sieve_result_print_env *rpenv,
+		 bool *keep ATTR_UNUSED)
+{
+	const struct ext_notify_action *act =
+		(const struct ext_notify_action *)action->context;
+	const struct ext_notify_recipient *recipients;
+	unsigned int count, i;
+
+	sieve_result_action_printf(
+		rpenv, "send (deprecated) notification with method 'mailto':");
+
+	/* Print main method parameters */
+
+	sieve_result_printf(rpenv, "    => importance    : %llu\n",
+			    (unsigned long long)act->importance);
+
+	if (act->message != NULL) {
+		sieve_result_printf(
+			rpenv, "    => message       : %s\n", act->message);
+	}
+	if (act->id != NULL) {
+		sieve_result_printf(
+			rpenv, "    => id            : %s \n", act->id);
+	}
+
+	/* Print mailto: recipients */
+
+	sieve_result_printf(rpenv, "    => recipients    :\n");
+
+	recipients = array_get(&act->recipients, &count);
+	if (count == 0) {
+		sieve_result_printf(
+			rpenv, "       NONE, action has no effect\n");
+	} else {
+		for (i = 0; i < count; i++) {
+			sieve_result_printf(
+				rpenv, "       + To: %s\n", recipients[i].full);
+		}
+	}
+
+	/* Finish output with an empty line */
+
+	sieve_result_printf(rpenv, "\n");
+}
+
+/* Result execution */
+
+static bool contains_8bit(const char *msg)
+{
+	const unsigned char *s = (const unsigned char *)msg;
+
+	for (; *s != '\0'; s++) {
+		if ((*s & 0x80) != 0)
+			return TRUE;
+	}
+	return FALSE;
+}
+
+static bool
+act_notify_send(const struct sieve_action_exec_env *aenv,
+		const struct ext_notify_action *act)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	const struct sieve_script_env *senv = eenv->scriptenv;
+	const struct ext_notify_recipient *recipients;
+	struct sieve_smtp_context *sctx;
+	unsigned int count, i;
+	struct ostream *output;
+	string_t *msg, *to, *all;
+	const char *outmsgid, *error;
+	int ret;
+
+	/* Get recipients */
+	recipients = array_get(&act->recipients, &count);
+	if (count == 0) {
+		sieve_result_warning(
+			aenv, "notify action specifies no recipients; "
+			"action has no effect");
+		return TRUE;
+	}
+
+	/* Just to be sure */
+	if (!sieve_smtp_available(senv)) {
+		sieve_result_global_warning(
+			aenv, "notify action has no means to send mail");
+		return TRUE;
+	}
+
+	/* Compose common headers */
+	msg = t_str_new(512);
+	rfc2822_header_write(msg, "X-Sieve", SIEVE_IMPLEMENTATION);
+	rfc2822_header_write(msg, "Date", message_date_create(ioloop_time));
+
+	/* Set importance */
+	switch (act->importance) {
+	case 1:
+		rfc2822_header_write(msg, "X-Priority", "1 (Highest)");
+		rfc2822_header_write(msg, "Importance", "High");
+		break;
+	case 3:
+		rfc2822_header_write(msg, "X-Priority", "5 (Lowest)");
+		rfc2822_header_write(msg, "Importance", "Low");
+		break;
+	case 2:
+	default:
+		rfc2822_header_write(msg, "X-Priority", "3 (Normal)");
+		rfc2822_header_write(msg, "Importance", "Normal");
+		break;
+	}
+
+	rfc2822_header_write(msg, "From", sieve_get_postmaster_address(senv));
+
+	rfc2822_header_write(msg, "Subject", "[SIEVE] New mail notification");
+
+	rfc2822_header_write(msg, "Auto-Submitted", "auto-generated (notify)");
+	rfc2822_header_write(msg, "Precedence", "bulk");
+
+	rfc2822_header_write(msg, "MIME-Version", "1.0");
+	if (contains_8bit(act->message)) {
+		rfc2822_header_write(msg, "Content-Type",
+				     "text/plain; charset=utf-8");
+		rfc2822_header_write(msg, "Content-Transfer-Encoding", "8bit");
+	} else {
+		rfc2822_header_write(msg, "Content-Type",
+				     "text/plain; charset=us-ascii");
+		rfc2822_header_write(msg, "Content-Transfer-Encoding", "7bit");
+	}
+
+	outmsgid = sieve_message_get_new_id(eenv->svinst);
+	rfc2822_header_write(msg, "Message-ID", outmsgid);
+
+	if ((eenv->flags & SIEVE_EXECUTE_FLAG_NO_ENVELOPE) == 0 &&
+	    sieve_message_get_sender(aenv->msgctx) != NULL) {
+		sctx = sieve_smtp_start(senv, sieve_get_postmaster_smtp(senv));
+	} else {
+		sctx = sieve_smtp_start(senv, NULL);
+	}
+
+	/* Add all recipients (and compose To header field) */
+	to = t_str_new(128);
+	all = t_str_new(256);
+	for (i = 0; i < count; i++) {
+		sieve_smtp_add_rcpt(sctx, recipients[i].address);
+		if (i > 0)
+			str_append(to, ", ");
+		str_append(to, recipients[i].full);
+		if (i < 3) {
+			if (i > 0)
+				str_append(all, ", ");
+			str_append(all, smtp_address_encode_path(
+				recipients[i].address));
+		} else if (i == 3) {
+			str_printfa(all, ", ... (%u total)", count);
+		}
+	}
+
+	rfc2822_header_write_address(msg, "To", str_c(to));
+
+	/* Generate message body */
+	str_printfa(msg, "\r\n%s\r\n", act->message);
+
+	output = sieve_smtp_send(sctx);
+	o_stream_nsend(output, str_data(msg), str_len(msg));
+
+	if ((ret = sieve_smtp_finish(sctx, &error)) <= 0) {
+		if (ret < 0) {
+			sieve_result_global_error(
+				aenv, "failed to send mail notification to %s: "
+				"%s (temporary failure)", str_c(all),
+				str_sanitize(error, 512));
+		} else {
+			sieve_result_global_log_error(
+				aenv, "failed to send mail notification to %s: "
+				"%s (permanent failure)", str_c(all),
+				str_sanitize(error, 512));
+		}
+	} else {
+		struct event_passthrough *e =
+			sieve_action_create_finish_event(aenv)->
+			add_str("notify_target", str_c(all));
+
+		sieve_result_event_log(aenv, e->event(),
+				       "sent mail notification to %s",
+				       str_c(all));
+	}
+
+	return TRUE;
+}
+
+static int
+act_notify_commit(const struct sieve_action_exec_env *aenv,
+		  void *tr_context ATTR_UNUSED)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct mail *mail = eenv->msgdata->mail;
+	const struct ext_notify_action *act =
+		(const struct ext_notify_action *)aenv->action->context;
+	const char *const *hdsp;
+	bool result;
+	int ret;
+
+	/* Is the message an automatic reply ? */
+	if ((ret = mail_get_headers(mail, "auto-submitted", &hdsp)) < 0) {
+		return sieve_result_mail_error(
+			aenv, mail,
+			"failed to read `auto-submitted' header field");
+	}
+
+	/* Theoretically multiple headers could exist, so lets make sure */
+	if (ret > 0) {
+		while (*hdsp != NULL) {
+			if (strcasecmp(*hdsp, "no") != 0) {
+				const struct smtp_address *sender = NULL;
+				const char *from;
+
+				if ((eenv->flags & SIEVE_EXECUTE_FLAG_NO_ENVELOPE) == 0)
+					sender = sieve_message_get_sender(aenv->msgctx);
+				from = (sender == NULL ? "" :
+					t_strdup_printf(" from <%s>",
+							smtp_address_encode(sender)));
+
+				sieve_result_global_log(
+					aenv,
+					"not sending notification for auto-submitted message%s",
+					from);
+				return SIEVE_EXEC_OK;
+			}
+			hdsp++;
+		}
+	}
+
+	T_BEGIN {
+		result = act_notify_send(aenv, act);
+	} T_END;
+
+	if (!result)
+		return SIEVE_EXEC_FAILURE;
+	eenv->exec_status->significant_action_executed = TRUE;
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/notify/ext-notify-common.c b/pigeonhole/src/lib-sieve/plugins/notify/ext-notify-common.c
new file mode 100644
index 0000000..589b21b
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/notify/ext-notify-common.c
@@ -0,0 +1,361 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "istream.h"
+#include "rfc822-parser.h"
+#include "message-parser.h"
+#include "message-decoder.h"
+#include "mail-storage.h"
+
+#include "sieve-common.h"
+#include "sieve-code.h"
+#include "sieve-message.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-actions.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-result.h"
+
+#include "ext-notify-common.h"
+
+#include <ctype.h>
+
+/*
+ * Importance argument
+ */
+
+static bool
+tag_importance_validate(struct sieve_validator *valdtr,
+			struct sieve_ast_argument **arg,
+			struct sieve_command *cmd);
+
+static const struct sieve_argument_def importance_low_tag = {
+	.identifier = "low",
+	.validate = tag_importance_validate,
+};
+
+static const struct sieve_argument_def importance_normal_tag = {
+	.identifier = "normal",
+	.validate = tag_importance_validate,
+};
+
+static const struct sieve_argument_def importance_high_tag = {
+	.identifier = "high",
+	.validate = tag_importance_validate,
+};
+
+static bool
+tag_importance_validate(struct sieve_validator *valdtr ATTR_UNUSED,
+			struct sieve_ast_argument **arg,
+			struct sieve_command *cmd ATTR_UNUSED)
+{
+	struct sieve_ast_argument *tag = *arg;
+
+	if (sieve_argument_is(tag, importance_low_tag))
+		sieve_ast_argument_number_substitute(tag, 3);
+	else if (sieve_argument_is(tag, importance_normal_tag))
+		sieve_ast_argument_number_substitute(tag, 2);
+	else
+		sieve_ast_argument_number_substitute(tag, 1);
+
+	tag->argument = sieve_argument_create(tag->ast, &number_argument,
+					      tag->argument->ext,
+					      tag->argument->id_code);
+
+	/* Skip parameter */
+	*arg = sieve_ast_argument_next(*arg);
+
+	return TRUE;
+}
+
+void ext_notify_register_importance_tags(
+	struct sieve_validator *valdtr,
+	struct sieve_command_registration *cmd_reg,
+	const struct sieve_extension *ext, unsigned int id_code)
+{
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &importance_low_tag, id_code);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &importance_normal_tag, id_code);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &importance_high_tag, id_code);
+}
+
+/*
+ * Body extraction
+ */
+
+/* FIXME: overlaps somewhat with body extension */
+
+struct ext_notify_message_context {
+	pool_t pool;
+	buffer_t *body_text;
+};
+
+static struct ext_notify_message_context *
+ext_notify_get_message_context(const struct sieve_extension *this_ext,
+			       struct sieve_message_context *msgctx)
+{
+	struct ext_notify_message_context *ctx;
+
+	/* Get message context (contains cached message body information) */
+	ctx = (struct ext_notify_message_context *)
+		sieve_message_context_extension_get(msgctx, this_ext);
+
+	/* Create it if it does not exist already */
+	if (ctx == NULL) {
+		pool_t pool = sieve_message_context_pool(msgctx);
+		ctx = p_new(pool, struct ext_notify_message_context, 1);
+		ctx->pool = pool;
+		ctx->body_text = NULL;
+
+		/* Register context */
+		sieve_message_context_extension_set(msgctx, this_ext,
+						    (void *)ctx);
+	}
+
+	return ctx;
+}
+
+static bool _is_text_content(const struct message_header_line *hdr)
+{
+	struct rfc822_parser_context parser;
+	string_t *content_type;
+	const char *data;
+
+	/* Initialize parsing */
+	rfc822_parser_init(&parser, hdr->full_value, hdr->full_value_len, NULL);
+	(void)rfc822_skip_lwsp(&parser);
+
+	/* Parse content type */
+	content_type = t_str_new(64);
+	if (rfc822_parse_content_type(&parser, content_type) < 0)
+		return FALSE;
+
+	/* Content-type value must end here, otherwise it is invalid after all
+	 */
+	(void)rfc822_skip_lwsp(&parser);
+	if (parser.data != parser.end && *parser.data != ';')
+		return FALSE;
+
+	/* Success */
+	data = str_c(content_type);
+	if (str_begins(data, "text/"))
+		return TRUE;
+	return FALSE;
+}
+
+static int
+cmd_notify_extract_body_text(const struct sieve_runtime_env *renv,
+			     const char **body_text_r, size_t *body_size_r)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	const struct sieve_extension *this_ext = renv->oprtn->ext;
+	struct ext_notify_message_context *mctx;
+	struct mail *mail = eenv->msgdata->mail;
+	struct message_parser_ctx *parser;
+	struct message_decoder_context *decoder;
+	struct message_part *parts;
+	struct message_block block, decoded;
+	struct istream *input;
+	bool is_text, save_body;
+	int ret = 1;
+
+	*body_text_r = NULL;
+	*body_size_r = 0;
+
+	/* Return cached result if available */
+	mctx = ext_notify_get_message_context(this_ext, renv->msgctx);
+	if (mctx->body_text != NULL) {
+		*body_text_r = (const char *)
+			buffer_get_data(mctx->body_text, body_size_r);
+		return SIEVE_EXEC_OK;
+	}
+
+	/* Create buffer */
+	mctx->body_text = buffer_create_dynamic(mctx->pool, 1024*64);
+
+	/* Get the message stream */
+	if (mail_get_stream(mail, NULL, NULL, &input) < 0) {
+		return sieve_runtime_mail_error(renv, mail, "notify action: "
+						"failed to read input message");
+	}
+
+	/* Initialize body decoder */
+	decoder = message_decoder_init(NULL, 0);
+
+	struct message_parser_settings mparser_set = {
+		.hdr_flags = 0,
+		.flags = 0,
+	};
+	parser = message_parser_init(mctx->pool, input, &mparser_set);
+	is_text = TRUE;
+	save_body = FALSE;
+	while ((ret = message_parser_parse_next_block(parser, &block)) > 0) {
+		if (block.hdr != NULL || block.size == 0) {
+			/* Decode block */
+			(void)message_decoder_decode_next_block(decoder, &block,
+								&decoded);
+
+			/* Check for end of headers */
+			if (block.hdr == NULL) {
+				save_body = is_text;
+				continue;
+			}
+
+			/* We're interested of only Content-Type: header */
+			if (strcasecmp(block.hdr->name, "Content-Type") != 0)
+				continue;
+
+			/* Header can have folding whitespace. Acquire the full
+			   value before continuing */
+			if (block.hdr->continues) {
+				block.hdr->use_full_value = TRUE;
+				continue;
+			}
+
+			/* Is it a text part? */
+			T_BEGIN {
+				is_text = _is_text_content(block.hdr);
+			} T_END;
+
+			continue;
+		}
+
+		/* Read text body */
+		if (save_body) {
+			(void)message_decoder_decode_next_block(decoder, &block,
+								&decoded);
+			buffer_append(mctx->body_text, decoded.data,
+				      decoded.size);
+			is_text = TRUE;
+		}
+	}
+
+	/* Cleanup */
+	(void)message_parser_deinit(&parser, &parts);
+	message_decoder_deinit(&decoder);
+
+	if (ret < 0 && input->stream_errno != 0) {
+		sieve_runtime_critical(renv, NULL, "notify action: "
+				       "failed to read input message",
+				       "notify action: read(%s) failed: %s",
+				       i_stream_get_name(input),
+				       i_stream_get_error(input));
+		return SIEVE_EXEC_TEMP_FAILURE;
+	}
+
+	/* Return status */
+	*body_text_r = (const char *)buffer_get_data(mctx->body_text,
+						     body_size_r);
+	return SIEVE_EXEC_OK;
+}
+
+int ext_notify_construct_message(const struct sieve_runtime_env *renv,
+				 const char *msg_format,
+				 string_t *out_msg)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	const struct sieve_message_data *msgdata = eenv->msgdata;
+	struct sieve_message_context *msgctx = renv->msgctx;
+	const struct smtp_address *return_path =
+		sieve_message_get_sender(msgctx);
+	const char *p;
+	int ret;
+
+	if (msg_format == NULL)
+		msg_format = "$from$: $subject$";
+
+	/* Scan message for substitutions */
+	p = msg_format;
+	while (*p != '\0') {
+		const char *header;
+
+		if (strncasecmp(p, "$from$", 6) == 0) {
+			p += 6;
+
+			/* Fetch sender from original message */
+			if ((ret = mail_get_first_header_utf8(
+				msgdata->mail, "from", &header)) < 0) {
+				return sieve_runtime_mail_error(
+					renv, msgdata->mail,
+					"failed to read header field `from'");
+			}
+			if (ret > 0)
+				str_append(out_msg, header);
+		} else if (strncasecmp(p, "$env-from$", 10) == 0) {
+			p += 10;
+
+			if (return_path != NULL)
+				smtp_address_write(out_msg, return_path);
+		} else if (strncasecmp(p, "$subject$", 9) == 0) {
+			p += 9;
+
+			/* Fetch sender from oriinal message */
+			if ((ret = mail_get_first_header_utf8(
+				msgdata->mail, "subject", &header)) < 0) {
+				return sieve_runtime_mail_error(
+					renv, msgdata->mail,
+					"failed to read header field `subject'");
+			}
+			if (ret > 0)
+				 str_append(out_msg, header);
+		} else if (strncasecmp(p, "$text", 5) == 0 &&
+			   (p[5] == '[' || p[5] == '$')) {
+			size_t num = 0;
+			const char *begin = p;
+			bool valid = TRUE;
+
+			p += 5;
+			if (*p == '[') {
+				p += 1;
+
+				while (i_isdigit(*p)) {
+					num = num * 10 + (*p - '0');
+					p++;
+				}
+
+				if (*p++ != ']' || *p++ != '$') {
+					str_append_data(out_msg, begin,
+							p-begin);
+					valid = FALSE;
+				}
+			} else {
+				p += 1;
+			}
+
+			if (valid) {
+				size_t body_size;
+				const char *body_text;
+
+				if ((ret = cmd_notify_extract_body_text(
+					renv, &body_text, &body_size)) <= 0)
+					return ret;
+
+				if (num > 0 && num < body_size) {
+					str_append_data(out_msg, body_text,
+							num);
+				} else {
+					str_append_data(out_msg, body_text,
+							body_size);
+				}
+			}
+		} else {
+			size_t len;
+
+			/* Find next substitution */
+			len = strcspn(p + 1, "$") + 1;
+
+			/* Copy normal text */
+			str_append_data(out_msg, p, len);
+			p += len;
+		}
+	}
+
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/notify/ext-notify-common.h b/pigeonhole/src/lib-sieve/plugins/notify/ext-notify-common.h
new file mode 100644
index 0000000..09db2cb
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/notify/ext-notify-common.h
@@ -0,0 +1,66 @@
+#ifndef EXT_NOTIFY_COMMON_H
+#define EXT_NOTIFY_COMMON_H
+
+/*
+ * Extension
+ */
+
+extern const struct sieve_extension_def notify_extension;
+
+/*
+ * Commands
+ */
+
+extern const struct sieve_command_def cmd_notify_old;
+extern const struct sieve_command_def cmd_denotify;
+
+/*
+ * Arguments
+ */
+
+void ext_notify_register_importance_tags(
+	struct sieve_validator *valdtr,
+	struct sieve_command_registration *cmd_reg,
+	const struct sieve_extension *this_ext, unsigned int id_code);
+
+/*
+ * Operations
+ */
+
+extern const struct sieve_operation_def notify_old_operation;
+extern const struct sieve_operation_def denotify_operation;
+
+enum ext_notify_opcode {
+	EXT_NOTIFY_OPERATION_NOTIFY,
+	EXT_NOTIFY_OPERATION_DENOTIFY,
+};
+
+/*
+ * Actions
+ */
+
+extern const struct sieve_action_def act_notify_old;
+
+struct ext_notify_recipient {
+	const char *full;
+	const struct smtp_address *address;
+};
+
+ARRAY_DEFINE_TYPE(recipients, struct ext_notify_recipient);
+
+struct ext_notify_action {
+	const char *id;
+	const char *message;
+	sieve_number_t importance;
+
+	ARRAY_TYPE(recipients) recipients;
+};
+
+/*
+ * Message construct
+ */
+
+int ext_notify_construct_message(const struct sieve_runtime_env *renv,
+				 const char *msg_format, string_t *out_msg);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/notify/ext-notify-limits.h b/pigeonhole/src/lib-sieve/plugins/notify/ext-notify-limits.h
new file mode 100644
index 0000000..5fab7cb
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/notify/ext-notify-limits.h
@@ -0,0 +1,7 @@
+#ifndef EXT_NOTIFY_LIMITS_H
+#define EXT_NOTIFY_LIMITS_H
+
+#define EXT_NOTIFY_MAX_RECIPIENTS  8
+#define EXT_NOTIFY_MAX_MESSAGE     256
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/notify/ext-notify.c b/pigeonhole/src/lib-sieve/plugins/notify/ext-notify.c
new file mode 100644
index 0000000..e79e049
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/notify/ext-notify.c
@@ -0,0 +1,108 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension notify
+ * ----------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: draft-ietf-sieve-notify-00.txt
+ * Implementation: full, but deprecated; provided for backwards compatibility
+ * Status: testing
+ *
+ */
+
+#include "sieve-common.h"
+
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-actions.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-result.h"
+
+#include "ext-notify-common.h"
+
+/*
+ * Operations
+ */
+
+const struct sieve_operation_def *ext_notify_operations[] = {
+	&notify_old_operation,
+	&denotify_operation
+};
+
+/*
+ * Extension
+ */
+
+static bool ext_notify_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+
+const struct sieve_extension_def notify_extension = {
+	.name = "notify",
+	.validator_load = ext_notify_validator_load,
+	SIEVE_EXT_DEFINE_OPERATIONS(ext_notify_operations)
+};
+
+/*
+ * Extension validation
+ */
+
+static bool ext_notify_validator_check_conflict
+	(const struct sieve_extension *ext,
+		struct sieve_validator *valdtr, void *context,
+		struct sieve_ast_argument *require_arg,
+		const struct sieve_extension *ext_other,
+		bool required);
+static bool ext_notify_validator_validate
+	(const struct sieve_extension *ext,
+		struct sieve_validator *valdtr, void *context,
+		struct sieve_ast_argument *require_arg,
+		bool required);
+
+const struct sieve_validator_extension notify_validator_extension = {
+	.ext = &notify_extension,
+	.check_conflict = ext_notify_validator_check_conflict,
+	.validate = ext_notify_validator_validate	
+};
+
+static bool ext_notify_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	/* Register validator extension to check for conflict with enotify */
+	sieve_validator_extension_register
+		(valdtr, ext, &notify_validator_extension, NULL);
+	return TRUE;
+}
+
+static bool ext_notify_validator_check_conflict
+(const struct sieve_extension *ext ATTR_UNUSED,
+	struct sieve_validator *valdtr, void *context ATTR_UNUSED,
+	struct sieve_ast_argument *require_arg,
+	const struct sieve_extension *ext_other,
+	bool required ATTR_UNUSED)
+{
+	/* Check for conflict with enotify */
+	if ( sieve_extension_name_is(ext_other, "enotify") ) {
+		sieve_argument_validate_error(valdtr, require_arg,
+			"the (deprecated) notify extension cannot be used "
+			"together with the enotify extension");
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+static bool ext_notify_validator_validate
+(const struct sieve_extension *ext,
+	struct sieve_validator *valdtr, void *context ATTR_UNUSED,
+	struct sieve_ast_argument *require_arg ATTR_UNUSED,
+	bool required ATTR_UNUSED)
+{
+	/* No conflicts: register new commands */
+	sieve_validator_register_command(valdtr, ext, &cmd_notify_old);
+	sieve_validator_register_command(valdtr, ext, &cmd_denotify);
+	return TRUE;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/regex/Makefile.am b/pigeonhole/src/lib-sieve/plugins/regex/Makefile.am
new file mode 100644
index 0000000..eeb735e
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/regex/Makefile.am
@@ -0,0 +1,13 @@
+noinst_LTLIBRARIES = libsieve_ext_regex.la
+
+AM_CPPFLAGS = \
+	-I$(srcdir)/../.. \
+	$(LIBDOVECOT_INCLUDE)
+
+libsieve_ext_regex_la_SOURCES = \
+	mcht-regex.c \
+	ext-regex-common.c \
+	ext-regex.c
+
+noinst_HEADERS = \
+	ext-regex-common.h
diff --git a/pigeonhole/src/lib-sieve/plugins/regex/Makefile.in b/pigeonhole/src/lib-sieve/plugins/regex/Makefile.in
new file mode 100644
index 0000000..379d384
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/regex/Makefile.in
@@ -0,0 +1,688 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
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+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
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+}
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+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
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+  if $(am__is_gnu_make); then \
+    sane_makeflags=$$MFLAGS; \
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+  for flg in $$sane_makeflags; do \
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+      *=*|--*) continue;; \
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+      -*I?*) strip_trailopt 'I';; \
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+      -*l?*) strip_trailopt 'l';; \
+      -[dEDm]) skip_next=yes;; \
+      -[JT]) skip_next=yes;; \
+    esac; \
+    case $$flg in \
+      *$$target_option*) has_opt=yes; break;; \
+    esac; \
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+  test $$has_opt = yes
+am__make_dryrun = (target_option=n; $(am__make_running_with_option))
+am__make_keepgoing = (target_option=k; $(am__make_running_with_option))
+pkgdatadir = $(datadir)/@PACKAGE@
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+install_sh_DATA = $(install_sh) -c -m 644
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+INSTALL_HEADER = $(INSTALL_DATA)
+transform = $(program_transform_name)
+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
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+am__aclocal_m4_deps = $(top_srcdir)/m4/dovecot.m4 \
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/ext-regex-common.Plo
+	-rm -f ./$(DEPDIR)/ext-regex.Plo
+	-rm -f ./$(DEPDIR)/mcht-regex.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/ext-regex-common.Plo
+	-rm -f ./$(DEPDIR)/ext-regex.Plo
+	-rm -f ./$(DEPDIR)/mcht-regex.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/regex/ext-regex-common.c b/pigeonhole/src/lib-sieve/plugins/regex/ext-regex-common.c
new file mode 100644
index 0000000..975f4fb
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/regex/ext-regex-common.c
@@ -0,0 +1,22 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-match-types.h"
+
+#include "ext-regex-common.h"
+
+/*
+ * Regex match type operand
+ */
+
+static const struct sieve_extension_objects ext_match_types =
+	SIEVE_EXT_DEFINE_MATCH_TYPE(regex_match_type);
+
+const struct sieve_operand_def regex_match_type_operand = {
+	.name = "regex match",
+	.ext_def = &regex_extension,
+	.class = &sieve_match_type_operand_class,
+	.interface = &ext_match_types
+};
+
diff --git a/pigeonhole/src/lib-sieve/plugins/regex/ext-regex-common.h b/pigeonhole/src/lib-sieve/plugins/regex/ext-regex-common.h
new file mode 100644
index 0000000..e9d809f
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/regex/ext-regex-common.h
@@ -0,0 +1,24 @@
+#ifndef EXT_REGEX_COMMON_H
+#define EXT_REGEX_COMMON_H
+
+/*
+ * Extension
+ */
+
+extern const struct sieve_extension_def regex_extension;
+
+/*
+ * Operand
+ */
+
+extern const struct sieve_operand_def regex_match_type_operand;
+
+/*
+ * Match type
+ */
+
+extern const struct sieve_match_type_def regex_match_type;
+
+#endif
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/regex/ext-regex.c b/pigeonhole/src/lib-sieve/plugins/regex/ext-regex.c
new file mode 100644
index 0000000..0440b30
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/regex/ext-regex.c
@@ -0,0 +1,65 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension regex
+ * ---------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: draft-murchison-sieve-regex-08 (not latest)
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+/* FIXME: Regular expressions are compiled during compilation and
+ * again during interpretation. This is suboptimal and should be
+ * changed. This requires dumping the compiled regex to the binary.
+ * Most likely, this will only be possible when we implement regular
+ * expressions ourselves.
+ *
+ */
+
+#include "lib.h"
+#include "mempool.h"
+#include "buffer.h"
+
+#include "sieve-common.h"
+
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+
+#include "ext-regex-common.h"
+
+#include <sys/types.h>
+#include <regex.h>
+
+/*
+ * Extension
+ */
+
+static bool ext_regex_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *validator);
+
+const struct sieve_extension_def regex_extension = {
+	.name = "regex",
+	.validator_load = ext_regex_validator_load,
+	SIEVE_EXT_DEFINE_OPERAND(regex_match_type_operand)
+};
+
+static bool ext_regex_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	sieve_match_type_register(valdtr, ext, &regex_match_type);
+
+	return TRUE;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/regex/mcht-regex.c b/pigeonhole/src/lib-sieve/plugins/regex/mcht-regex.c
new file mode 100644
index 0000000..f0c630e
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/regex/mcht-regex.c
@@ -0,0 +1,385 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Match-type ':regex'
+ */
+
+#include "lib.h"
+#include "mempool.h"
+#include "buffer.h"
+#include "array.h"
+#include "str.h"
+#include "str-sanitize.h"
+
+#include "sieve-common.h"
+#include "sieve-limits.h"
+#include "sieve-ast.h"
+#include "sieve-stringlist.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-interpreter.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-match.h"
+
+#include "ext-regex-common.h"
+
+#include <sys/types.h>
+#include <regex.h>
+#include <ctype.h>
+
+/*
+ * Configuration
+ */
+
+#define MCHT_REGEX_MAX_SUBSTITUTIONS SIEVE_MAX_MATCH_VALUES
+
+/*
+ * Match type
+ */
+
+static bool mcht_regex_validate_context
+(struct sieve_validator *valdtr, struct sieve_ast_argument *arg,
+    struct sieve_match_type_context *ctx, struct sieve_ast_argument *key_arg);
+
+static void mcht_regex_match_init(struct sieve_match_context *mctx);
+static int mcht_regex_match_keys
+	(struct sieve_match_context *mctx, const char *val, size_t val_size,
+    struct sieve_stringlist *key_list);
+static void mcht_regex_match_deinit(struct sieve_match_context *mctx);
+
+const struct sieve_match_type_def regex_match_type = {
+	SIEVE_OBJECT("regex", &regex_match_type_operand, 0),
+	.validate_context = mcht_regex_validate_context,
+	.match_init = mcht_regex_match_init,
+	.match_keys = mcht_regex_match_keys,
+	.match_deinit = mcht_regex_match_deinit
+};
+
+/*
+ * Match type validation
+ */
+
+/* Wrapper around the regerror function for easy access */
+static const char *_regexp_error(regex_t *regexp, int errorcode)
+{
+	size_t errsize = regerror(errorcode, regexp, NULL, 0);
+
+	if ( errsize > 0 ) {
+		char *errbuf;
+
+		buffer_t *error_buf =
+			buffer_create_dynamic(pool_datastack_create(), errsize);
+		errbuf = buffer_get_space_unsafe(error_buf, 0, errsize);
+
+		errsize = regerror(errorcode, regexp, errbuf, errsize);
+
+		/* We don't want the error to start with a capital letter */
+		errbuf[0] = i_tolower(errbuf[0]);
+
+		buffer_append_space_unsafe(error_buf, errsize);
+
+		return str_c(error_buf);
+	}
+
+	return "";
+}
+
+static int mcht_regex_validate_regexp
+(struct sieve_validator *valdtr,
+	struct sieve_match_type_context *mtctx ATTR_UNUSED,
+	struct sieve_ast_argument *key, int cflags)
+{
+	int ret;
+	regex_t regexp;
+	const char *regex_str = sieve_ast_argument_strc(key);
+
+	if ( (ret=regcomp(&regexp, regex_str, cflags)) != 0 ) {
+		sieve_argument_validate_error(valdtr, key,
+			"invalid regular expression '%s' for regex match: %s",
+			str_sanitize(regex_str, 128), _regexp_error(&regexp, ret));
+
+		regfree(&regexp);
+		return -1;
+	}
+
+	regfree(&regexp);
+	return 1;
+}
+
+struct _regex_key_context {
+	struct sieve_validator *valdtr;
+	struct sieve_match_type_context *mtctx;
+	int cflags;
+};
+
+static int mcht_regex_validate_key_argument
+(void *context, struct sieve_ast_argument *key)
+{
+	struct _regex_key_context *keyctx = (struct _regex_key_context *) context;
+
+	/* FIXME: We can currently only handle string literal argument, so
+	 * variables are not allowed.
+	 */
+	if ( sieve_argument_is_string_literal(key) ) {
+		return mcht_regex_validate_regexp
+			(keyctx->valdtr, keyctx->mtctx, key, keyctx->cflags);
+	}
+
+	return 1;
+}
+
+static bool mcht_regex_validate_context
+(struct sieve_validator *valdtr, struct sieve_ast_argument *arg ATTR_UNUSED,
+	struct sieve_match_type_context *mtctx, struct sieve_ast_argument *key_arg)
+{
+	const struct sieve_comparator *cmp = mtctx->comparator;
+	int cflags = REG_EXTENDED | REG_NOSUB;
+	struct _regex_key_context keyctx;
+	struct sieve_ast_argument *kitem;
+
+	if ( cmp != NULL ) {
+		if ( sieve_comparator_is(cmp, i_ascii_casemap_comparator) )
+			cflags =  REG_EXTENDED | REG_NOSUB | REG_ICASE;
+		else if ( sieve_comparator_is(cmp, i_octet_comparator) )
+			cflags =  REG_EXTENDED | REG_NOSUB;
+		else {
+			sieve_argument_validate_error(valdtr, mtctx->argument,
+				"regex match type only supports "
+				"i;octet and i;ascii-casemap comparators" );
+			return FALSE;
+		}
+	}
+
+	/* Validate regular expression keys */
+
+	keyctx.valdtr = valdtr;
+	keyctx.mtctx = mtctx;
+	keyctx.cflags = cflags;
+
+	kitem = key_arg;
+	if ( sieve_ast_stringlist_map(&kitem, (void *) &keyctx,
+		mcht_regex_validate_key_argument) <= 0 )
+		return FALSE;
+
+	return TRUE;
+}
+
+/*
+ * Match type implementation
+ */
+
+struct mcht_regex_key {
+	regex_t regexp;
+	int status;
+};
+
+struct mcht_regex_context {
+	ARRAY(struct mcht_regex_key) reg_expressions;
+	regmatch_t *pmatch;
+	size_t nmatch;
+	bool all_compiled:1;
+};
+
+static void mcht_regex_match_init
+(struct sieve_match_context *mctx)
+{
+	pool_t pool = mctx->pool;
+	struct mcht_regex_context *ctx;
+
+	/* Create context */
+	ctx = p_new(pool, struct mcht_regex_context, 1);
+
+	/* Create storage for match values if match values are requested */
+	if ( sieve_match_values_are_enabled(mctx->runenv) ) {
+		ctx->pmatch = p_new(pool, regmatch_t, MCHT_REGEX_MAX_SUBSTITUTIONS);
+		ctx->nmatch = MCHT_REGEX_MAX_SUBSTITUTIONS;
+	} else {
+		ctx->pmatch = NULL;
+		ctx->nmatch = 0;
+	}
+
+	/* Assign context */
+	mctx->data = (void *) ctx;
+}
+
+static int mcht_regex_match_key
+(struct sieve_match_context *mctx, const char *val,
+	const regex_t *regexp)
+{
+	struct mcht_regex_context *ctx = (struct mcht_regex_context *) mctx->data;
+	int ret;
+
+	/* Execute regex */
+
+	ret = regexec(regexp, val, ctx->nmatch, ctx->pmatch, 0);
+
+	/* Handle match values if necessary */
+
+	if ( ret == 0 ) {
+		if ( ctx->nmatch > 0 ) {
+			struct sieve_match_values *mvalues;
+			size_t i;
+			int skipped = 0;
+			string_t *subst = t_str_new(32);
+
+			/* Start new list of match values */
+			mvalues = sieve_match_values_start(mctx->runenv);
+
+			i_assert( mvalues != NULL );
+
+			/* Add match values from regular expression */
+			for ( i = 0; i < ctx->nmatch; i++ ) {
+				str_truncate(subst, 0);
+
+				if ( ctx->pmatch[i].rm_so != -1 ) {
+					if ( skipped > 0 ) {
+						sieve_match_values_skip(mvalues, skipped);
+						skipped = 0;
+					}
+
+					str_append_data(subst, val + ctx->pmatch[i].rm_so,
+						ctx->pmatch[i].rm_eo - ctx->pmatch[i].rm_so);
+					sieve_match_values_add(mvalues, subst);
+				} else
+					skipped++;
+			}
+
+			/* Substitute the new match values */
+			sieve_match_values_commit(mctx->runenv, &mvalues);
+		}
+
+		return 1;
+	}
+
+	return 0;
+}
+
+static int mcht_regex_match_keys
+(struct sieve_match_context *mctx, const char *val, size_t val_size ATTR_UNUSED,
+	struct sieve_stringlist *key_list)
+{
+	const struct sieve_runtime_env *renv = mctx->runenv;
+	bool trace = sieve_runtime_trace_active(renv, SIEVE_TRLVL_MATCHING);
+	struct mcht_regex_context *ctx = (struct mcht_regex_context *) mctx->data;
+	const struct sieve_comparator *cmp = mctx->comparator;
+	int match;
+
+	if ( !ctx->all_compiled ) {
+		string_t *key_item = NULL;
+		unsigned int i;
+		int ret;
+
+		/* Regular expressions still need to be compiled */
+
+		if ( !array_is_created(&ctx->reg_expressions) )
+			p_array_init(&ctx->reg_expressions, mctx->pool, 16);
+
+		i = 0;
+		match = 0;
+		while ( match == 0 &&
+			(ret=sieve_stringlist_next_item(key_list, &key_item)) > 0 ) {
+
+			T_BEGIN {
+				struct mcht_regex_key *rkey;
+
+				if ( i >= array_count(&ctx->reg_expressions) ) {
+					int cflags;
+
+					rkey = array_append_space(&ctx->reg_expressions);
+
+					/* Configure case-sensitivity according to comparator */
+					if ( sieve_comparator_is(cmp, i_octet_comparator) )
+						cflags =  REG_EXTENDED;
+					else if ( sieve_comparator_is(cmp, i_ascii_casemap_comparator) )
+						cflags =  REG_EXTENDED | REG_ICASE;
+					else
+						rkey->status = -1; /* Not supported */
+
+					if ( rkey->status >= 0 ) {
+						const char *regex_str = str_c(key_item);
+						int rxret;
+
+						/* Indicate whether match values need to be produced */
+						if ( ctx->nmatch == 0 ) cflags |= REG_NOSUB;
+
+						/* Compile regular expression */
+						if ( (rxret=regcomp(&rkey->regexp, regex_str, cflags)) != 0 ) {
+							sieve_runtime_error(renv, NULL,
+								"invalid regular expression '%s' for regex match: %s",
+								str_sanitize(regex_str, 128),
+								_regexp_error(&rkey->regexp, rxret));
+							rkey->status = -1;
+						} else {
+							rkey->status = 1;
+						}
+					}
+				} else {
+					rkey = array_idx_modifiable(&ctx->reg_expressions, 1);
+				}
+
+				if ( rkey->status > 0 ) {
+					match = mcht_regex_match_key(mctx, val, &rkey->regexp);
+
+					if ( trace ) {
+						sieve_runtime_trace(renv, 0,
+							"with regex `%s' [id=%d] => %d",
+							str_sanitize(str_c(key_item), 80),
+							array_count(&ctx->reg_expressions)-1, match);
+					}
+				}
+			} T_END;
+
+			i++;
+		}
+
+		if ( ret == 0 ) {
+			ctx->all_compiled = TRUE;
+		} else if ( ret < 0 ) {
+			mctx->exec_status = key_list->exec_status;
+			match = -1;
+		}
+
+	} else {
+		const struct mcht_regex_key *rkeys;
+		unsigned int i, count;
+
+		/* Regular expressions are compiled */
+
+		rkeys = array_get(&ctx->reg_expressions, &count);
+
+		i = 0;
+		match = 0;
+		while ( match == 0 && i < count ) {
+			if ( rkeys[i].status > 0 ) {
+				match = mcht_regex_match_key(mctx, val, &rkeys[i].regexp);
+
+				if ( trace ) {
+					sieve_runtime_trace(renv, 0,
+						"with compiled regex [id=%d] => %d", i, match);
+				}
+			}
+
+			i++;
+		}
+	}
+
+	return match;
+}
+
+void mcht_regex_match_deinit
+(struct sieve_match_context *mctx)
+{
+	struct mcht_regex_context *ctx = (struct mcht_regex_context *) mctx->data;
+	struct mcht_regex_key *rkeys;
+	unsigned int count, i;
+
+	/* Clean up compiled regular expressions */
+	if ( array_is_created(&ctx->reg_expressions) ) {
+		rkeys = array_get_modifiable(&ctx->reg_expressions, &count);
+		for ( i = 0; i < count; i++ ) {
+			regfree(&rkeys[i].regexp);
+		}
+	}
+}
+
diff --git a/pigeonhole/src/lib-sieve/plugins/relational/Makefile.am b/pigeonhole/src/lib-sieve/plugins/relational/Makefile.am
new file mode 100644
index 0000000..dd28cc5
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/relational/Makefile.am
@@ -0,0 +1,14 @@
+noinst_LTLIBRARIES = libsieve_ext_relational.la
+
+AM_CPPFLAGS = \
+	-I$(srcdir)/../.. \
+	$(LIBDOVECOT_INCLUDE)
+
+libsieve_ext_relational_la_SOURCES = \
+	ext-relational-common.c \
+	mcht-value.c \
+	mcht-count.c \
+	ext-relational.c
+
+noinst_HEADERS = \
+	ext-relational-common.h
diff --git a/pigeonhole/src/lib-sieve/plugins/relational/Makefile.in b/pigeonhole/src/lib-sieve/plugins/relational/Makefile.in
new file mode 100644
index 0000000..4977808
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/relational/Makefile.in
@@ -0,0 +1,694 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
+              "target option '$${target_option-}' specified" >&2; \
+         exit 1;; \
+  esac; \
+  has_opt=no; \
+  sane_makeflags=$$MAKEFLAGS; \
+  if $(am__is_gnu_make); then \
+    sane_makeflags=$$MFLAGS; \
+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
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+	  && gtags -i $(GTAGS_ARGS) "$$here"
+cscopelist: cscopelist-am
+
+cscopelist-am: $(am__tagged_files)
+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(LTLIBRARIES) $(HEADERS)
+installdirs:
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/ext-relational-common.Plo
+	-rm -f ./$(DEPDIR)/ext-relational.Plo
+	-rm -f ./$(DEPDIR)/mcht-count.Plo
+	-rm -f ./$(DEPDIR)/mcht-value.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
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+info: info-am
+
+info-am:
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+install-data-am:
+
+install-dvi: install-dvi-am
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+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
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+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/ext-relational-common.Plo
+	-rm -f ./$(DEPDIR)/ext-relational.Plo
+	-rm -f ./$(DEPDIR)/mcht-count.Plo
+	-rm -f ./$(DEPDIR)/mcht-value.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
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+ps: ps-am
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+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/relational/ext-relational-common.c b/pigeonhole/src/lib-sieve/plugins/relational/ext-relational-common.c
new file mode 100644
index 0000000..a6dd1ed
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/relational/ext-relational-common.c
@@ -0,0 +1,171 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Syntax:
+
+     MATCH-TYPE =/ COUNT / VALUE
+     COUNT = ":count" relational-match
+     VALUE = ":value" relational-match
+     relational-match = DQUOTE ( "gt" / "ge" / "lt"
+                               / "le" / "eq" / "ne" ) DQUOTE
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "str-sanitize.h"
+
+#include "sieve-common.h"
+#include "sieve-ast.h"
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+
+#include "ext-relational-common.h"
+
+/*
+ * Forward declarations
+ */
+
+const struct sieve_match_type_def *rel_match_types[];
+
+/*
+ * Validation
+ */
+
+bool mcht_relational_validate(struct sieve_validator *valdtr,
+			      struct sieve_ast_argument **arg,
+			      struct sieve_match_type_context *ctx)
+{
+	struct sieve_match_type *mcht;
+	enum relational_match rel_match = REL_MATCH_INVALID;
+	pool_t pool = sieve_ast_argument_pool(ctx->argument);
+	string_t *rel_match_ident;
+
+	/* Check syntax:
+	     relational-match = DQUOTE ( "gt" / "ge" / "lt"
+ 	                               / "le" / "eq" / "ne" ) DQUOTE
+ 	  
+	   So, actually this must be a constant string and it is implemented as
+	   such.
+	 */
+
+	/* Did we get a string in the first place? */
+	if (*arg == NULL || (*arg)->type != SAAT_STRING) {
+		sieve_argument_validate_error(
+			valdtr, (*arg == NULL ? ctx->argument : *arg),
+			"the :%s match-type requires a constant string argument being "
+			"one of \"gt\", \"ge\", \"lt\", \"le\", \"eq\" or \"ne\", "
+			"but %s was found",
+			sieve_match_type_name(ctx->match_type),
+			(*arg == NULL ?
+			 "none" : sieve_ast_argument_name(*arg)));
+		return FALSE;
+	}
+
+	/* Check the relational match id */
+
+	rel_match_ident = sieve_ast_argument_str(*arg);
+	if (str_len(rel_match_ident) == 2) {
+		const char *rel_match_id = str_c(rel_match_ident);
+
+		switch (rel_match_id[0]) {
+		/* "gt" or "ge" */
+		case 'g':
+			switch (rel_match_id[1]) {
+			case 't':
+				rel_match = REL_MATCH_GREATER;
+				break;
+			case 'e':
+				rel_match = REL_MATCH_GREATER_EQUAL;
+				break;
+			default:
+				rel_match = REL_MATCH_INVALID;
+			}
+			break;
+		/* "lt" or "le" */
+		case 'l':
+			switch (rel_match_id[1]) {
+			case 't':
+				rel_match = REL_MATCH_LESS;
+				break;
+			case 'e':
+				rel_match = REL_MATCH_LESS_EQUAL;
+				break;
+			default:
+				rel_match = REL_MATCH_INVALID;
+			}
+			break;
+		/* "eq" */
+		case 'e':
+			if (rel_match_id[1] == 'q')
+				rel_match = REL_MATCH_EQUAL;
+			else
+				rel_match = REL_MATCH_INVALID;
+			break;
+		/* "ne" */
+		case 'n':
+			if (rel_match_id[1] == 'e')
+				rel_match = REL_MATCH_NOT_EQUAL;
+			else
+				rel_match = REL_MATCH_INVALID;
+			break;
+		/* invalid */
+		default:
+			rel_match = REL_MATCH_INVALID;
+		}
+	}
+
+	if (rel_match >= REL_MATCH_INVALID) {
+		sieve_argument_validate_error(
+			valdtr, *arg,
+			"the :%s match-type requires a constant string argument being "
+			"one of \"gt\", \"ge\", \"lt\", \"le\", \"eq\" or \"ne\", "
+			"but \"%s\" was found",
+			sieve_match_type_name(ctx->match_type),
+			str_sanitize(str_c(rel_match_ident), 32));
+		return FALSE;
+	}
+
+	/* Delete argument */
+	*arg = sieve_ast_arguments_detach(*arg, 1);
+
+	/* Not used just yet */
+	ctx->ctx_data = (void *) rel_match;
+
+	/* Override the actual match type with a parameter-specific one
+	 * FIXME: ugly!
+	 */
+	mcht = p_new(pool, struct sieve_match_type, 1);
+	mcht->object.ext = ctx->match_type->object.ext;
+	SIEVE_OBJECT_SET_DEF(mcht, rel_match_types[
+		REL_MATCH_INDEX(ctx->match_type->object.def->code, rel_match)]);
+	ctx->match_type = mcht;
+
+	return TRUE;
+}
+
+/*
+ * Relational match-type operand
+ */
+
+const struct sieve_match_type_def *rel_match_types[] = {
+	&rel_match_value_gt, &rel_match_value_ge, &rel_match_value_lt,
+	&rel_match_value_le, &rel_match_value_eq, &rel_match_value_ne,
+	&rel_match_count_gt, &rel_match_count_ge, &rel_match_count_lt,
+	&rel_match_count_le, &rel_match_count_eq, &rel_match_count_ne,
+};
+
+static const struct sieve_extension_objects ext_match_types =
+	SIEVE_EXT_DEFINE_MATCH_TYPES(rel_match_types);
+
+const struct sieve_operand_def rel_match_type_operand = {
+	.name = "relational match",
+	.ext_def = &relational_extension,
+	.class = &sieve_match_type_operand_class,
+	.interface = &ext_match_types,
+};
diff --git a/pigeonhole/src/lib-sieve/plugins/relational/ext-relational-common.h b/pigeonhole/src/lib-sieve/plugins/relational/ext-relational-common.h
new file mode 100644
index 0000000..c0f7d3b
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/relational/ext-relational-common.h
@@ -0,0 +1,86 @@
+#ifndef EXT_RELATIONAL_COMMON_H
+#define EXT_RELATIONAL_COMMON_H
+
+#include "lib.h"
+#include "str.h"
+
+#include "sieve-common.h"
+
+/*
+ * Types
+ */
+
+enum ext_relational_match_type {
+	RELATIONAL_VALUE,
+	RELATIONAL_COUNT
+};
+
+enum relational_match {
+	REL_MATCH_GREATER,
+	REL_MATCH_GREATER_EQUAL,
+	REL_MATCH_LESS,
+	REL_MATCH_LESS_EQUAL,
+	REL_MATCH_EQUAL,
+	REL_MATCH_NOT_EQUAL,
+	REL_MATCH_INVALID
+};
+
+#define REL_MATCH_INDEX(type, match) (type * REL_MATCH_INVALID + match)
+#define REL_MATCH_TYPE(index) (index / REL_MATCH_INVALID)
+#define REL_MATCH(index) (index % REL_MATCH_INVALID)
+
+/*
+ * Extension definitions
+ */
+
+extern const struct sieve_extension_def relational_extension;
+
+/*
+ * Match types
+ */
+
+/* Registered for validation */
+
+extern const struct sieve_match_type_def value_match_type;
+extern const struct sieve_match_type_def count_match_type;
+
+/* Used in byte code */
+
+extern const struct sieve_match_type_def rel_match_count_gt;
+extern const struct sieve_match_type_def rel_match_count_ge;
+extern const struct sieve_match_type_def rel_match_count_lt;
+extern const struct sieve_match_type_def rel_match_count_le;
+extern const struct sieve_match_type_def rel_match_count_eq;
+extern const struct sieve_match_type_def rel_match_count_ne;
+
+extern const struct sieve_match_type_def rel_match_value_gt;
+extern const struct sieve_match_type_def rel_match_value_ge;
+extern const struct sieve_match_type_def rel_match_value_lt;
+extern const struct sieve_match_type_def rel_match_value_le;
+extern const struct sieve_match_type_def rel_match_value_eq;
+extern const struct sieve_match_type_def rel_match_value_ne;
+
+/*
+ * Operand
+ */
+
+extern const struct sieve_operand_def rel_match_type_operand;
+
+
+/*
+ * Match type validation
+ */
+
+bool mcht_relational_validate(struct sieve_validator *validator,
+			      struct sieve_ast_argument **arg,
+			      struct sieve_match_type_context *ctx);
+
+/*
+ * Value match function (also used by :count)
+ */
+
+int mcht_value_match_key(struct sieve_match_context *mctx,
+			 const char *val, size_t val_size,
+			 const char *key, size_t key_size);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/relational/ext-relational.c b/pigeonhole/src/lib-sieve/plugins/relational/ext-relational.c
new file mode 100644
index 0000000..28c278f
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/relational/ext-relational.c
@@ -0,0 +1,53 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension relational
+ * --------------------
+ *
+ * Author: Stephan Bosch
+ * Specification: RFC 3431
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "lib.h"
+#include "str.h"
+
+#include "sieve-common.h"
+
+#include "sieve-ast.h"
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+
+#include "ext-relational-common.h"
+
+/*
+ * Extension
+ */
+
+static bool ext_relational_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+
+const struct sieve_extension_def relational_extension = {
+	.name = "relational",
+	.validator_load = ext_relational_validator_load,
+	SIEVE_EXT_DEFINE_OPERAND(rel_match_type_operand)
+};
+
+static bool ext_relational_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	sieve_match_type_register(valdtr, ext, &value_match_type);
+	sieve_match_type_register(valdtr, ext, &count_match_type);
+
+	return TRUE;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/relational/mcht-count.c b/pigeonhole/src/lib-sieve/plugins/relational/mcht-count.c
new file mode 100644
index 0000000..e31a63a
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/relational/mcht-count.c
@@ -0,0 +1,119 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Match-type ':count'
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "str-sanitize.h"
+
+#include "sieve-common.h"
+#include "sieve-ast.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-runtime-trace.h"
+#include "sieve-match.h"
+
+#include "ext-relational-common.h"
+
+/*
+ * Forward declarations
+ */
+
+static int mcht_count_match
+	(struct sieve_match_context *mctx, struct sieve_stringlist *value_list,
+		struct sieve_stringlist *key_list);
+
+/*
+ * Match-type objects
+ */
+
+const struct sieve_match_type_def count_match_type = {
+	SIEVE_OBJECT("count",
+		&rel_match_type_operand, RELATIONAL_COUNT),
+	.validate = mcht_relational_validate
+};
+
+#define COUNT_MATCH_TYPE(name, rel_match)                      \
+const struct sieve_match_type_def rel_match_count_ ## name = { \
+	SIEVE_OBJECT("count-" #name,                                 \
+    &rel_match_type_operand,                                   \
+		REL_MATCH_INDEX(RELATIONAL_COUNT, rel_match)),             \
+	.match = mcht_count_match,                                   \
+}
+
+COUNT_MATCH_TYPE(gt, REL_MATCH_GREATER);
+COUNT_MATCH_TYPE(ge, REL_MATCH_GREATER_EQUAL);
+COUNT_MATCH_TYPE(lt, REL_MATCH_LESS);
+COUNT_MATCH_TYPE(le, REL_MATCH_LESS_EQUAL);
+COUNT_MATCH_TYPE(eq, REL_MATCH_EQUAL);
+COUNT_MATCH_TYPE(ne, REL_MATCH_NOT_EQUAL);
+
+/*
+ * Match-type implementation
+ */
+
+static int mcht_count_match
+(struct sieve_match_context *mctx, struct sieve_stringlist *value_list,
+	struct sieve_stringlist *key_list)
+{
+	const struct sieve_runtime_env *renv = mctx->runenv;
+	bool trace = sieve_runtime_trace_active(renv, SIEVE_TRLVL_MATCHING);
+	int count;
+	string_t *key_item;
+	int match, ret;
+
+	if ( (count=sieve_stringlist_get_length(value_list)) < 0 ) {
+		mctx->exec_status = value_list->exec_status;
+		return -1;
+	}
+
+	sieve_stringlist_reset(key_list);
+
+	string_t *value = t_str_new(20);
+	str_printfa(value, "%d", count);
+
+	if ( trace ) {
+		sieve_runtime_trace(renv, 0,
+			"matching count value `%s'", str_sanitize(str_c(value), 80));
+	}
+
+	sieve_runtime_trace_descend(renv);
+
+  /* Match to all key values */
+  key_item = NULL;
+	match = 0;
+  while ( match == 0 &&
+		(ret=sieve_stringlist_next_item(key_list, &key_item)) > 0 )
+  {
+		match = mcht_value_match_key
+			(mctx, str_c(value), str_len(value), str_c(key_item), str_len(key_item));
+
+		if ( trace ) {
+			sieve_runtime_trace(renv, 0,
+				"with key `%s' => %d", str_sanitize(str_c(key_item), 80), ret);
+		}
+	}
+
+	sieve_runtime_trace_ascend(renv);
+
+	if ( ret < 0 ) {
+		mctx->exec_status = key_list->exec_status;
+		match = -1;
+	}
+
+	return match;
+}
+
+
+
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/relational/mcht-value.c b/pigeonhole/src/lib-sieve/plugins/relational/mcht-value.c
new file mode 100644
index 0000000..dd55590
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/relational/mcht-value.c
@@ -0,0 +1,80 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+
+#include "sieve-common.h"
+
+#include "sieve-ast.h"
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-match.h"
+
+#include "ext-relational-common.h"
+
+/*
+ * Match-type objects
+ */
+
+const struct sieve_match_type_def value_match_type = {
+	SIEVE_OBJECT("value",
+		&rel_match_type_operand, RELATIONAL_VALUE),
+	.validate = mcht_relational_validate
+};
+
+#define VALUE_MATCH_TYPE(name, rel_match)                       \
+const struct sieve_match_type_def rel_match_value_ ## name = {  \
+	SIEVE_OBJECT("value-" #name,                                  \
+		&rel_match_type_operand,                                    \
+		REL_MATCH_INDEX(RELATIONAL_VALUE, rel_match)),              \
+	.match_key = mcht_value_match_key,                            \
+}
+
+VALUE_MATCH_TYPE(gt, REL_MATCH_GREATER);
+VALUE_MATCH_TYPE(ge, REL_MATCH_GREATER_EQUAL);
+VALUE_MATCH_TYPE(lt, REL_MATCH_LESS);
+VALUE_MATCH_TYPE(le, REL_MATCH_LESS_EQUAL);
+VALUE_MATCH_TYPE(eq, REL_MATCH_EQUAL);
+VALUE_MATCH_TYPE(ne, REL_MATCH_NOT_EQUAL);
+
+/*
+ * Match-type implementation
+ */
+
+int mcht_value_match_key
+(struct sieve_match_context *mctx, const char *val, size_t val_size,
+	const char *key, size_t key_size)
+{
+	const struct sieve_match_type *mtch = mctx->match_type;
+	unsigned int rel_match = REL_MATCH(mtch->object.def->code);
+	int cmp_result;
+
+	cmp_result = mctx->comparator->def->
+		compare(mctx->comparator, val, val_size, key, key_size);
+
+	switch ( rel_match ) {
+	case REL_MATCH_GREATER:
+		return ( cmp_result > 0 ? 1 : 0 );
+	case REL_MATCH_GREATER_EQUAL:
+		return ( cmp_result >= 0 ? 1 : 0 );
+	case REL_MATCH_LESS:
+		return ( cmp_result < 0 ? 1 : 0 );
+	case REL_MATCH_LESS_EQUAL:
+		return ( cmp_result <= 0 ? 1 : 0 );
+	case REL_MATCH_EQUAL:
+		return ( cmp_result == 0 ? 1 : 0);
+	case REL_MATCH_NOT_EQUAL:
+		return ( cmp_result != 0 ? 1 : 0);
+	}
+
+	i_unreached();
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/spamvirustest/Makefile.am b/pigeonhole/src/lib-sieve/plugins/spamvirustest/Makefile.am
new file mode 100644
index 0000000..6a15bdd
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/spamvirustest/Makefile.am
@@ -0,0 +1,16 @@
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+	$(tests) \
+	ext-spamvirustest-common.c \
+	ext-spamvirustest.c
+
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+	ext-spamvirustest-common.h
diff --git a/pigeonhole/src/lib-sieve/plugins/spamvirustest/Makefile.in b/pigeonhole/src/lib-sieve/plugins/spamvirustest/Makefile.in
new file mode 100644
index 0000000..dca31e3
--- /dev/null
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+
+libsieve_ext_spamvirustest.la: $(libsieve_ext_spamvirustest_la_OBJECTS) $(libsieve_ext_spamvirustest_la_DEPENDENCIES) $(EXTRA_libsieve_ext_spamvirustest_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(LINK)  $(libsieve_ext_spamvirustest_la_OBJECTS) $(libsieve_ext_spamvirustest_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-spamvirustest-common.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-spamvirustest.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/tst-spamvirustest.Plo@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
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+
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+.c.lo:
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+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-am
+
+CTAGS: ctags
+ctags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
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+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
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+GTAGS:
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+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
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+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
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+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
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+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(LTLIBRARIES) $(HEADERS)
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
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+	@echo "This command is intended for maintainers to use"
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+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	mostlyclean-am
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+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/ext-spamvirustest-common.Plo
+	-rm -f ./$(DEPDIR)/ext-spamvirustest.Plo
+	-rm -f ./$(DEPDIR)/tst-spamvirustest.Plo
+	-rm -f Makefile
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+		-rm -f ./$(DEPDIR)/ext-spamvirustest-common.Plo
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+	-rm -f ./$(DEPDIR)/tst-spamvirustest.Plo
+	-rm -f Makefile
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+	cscopelist-am ctags ctags-am distclean distclean-compile \
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+	install-exec install-exec-am install-html install-html-am \
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+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/spamvirustest/ext-spamvirustest-common.c b/pigeonhole/src/lib-sieve/plugins/spamvirustest/ext-spamvirustest-common.c
new file mode 100644
index 0000000..38cb5d8
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/spamvirustest/ext-spamvirustest-common.c
@@ -0,0 +1,674 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "strfuncs.h"
+#include "mail-storage.h"
+
+#include "sieve-common.h"
+#include "sieve-settings.h"
+#include "sieve-error.h"
+#include "sieve-extensions.h"
+#include "sieve-message.h"
+#include "sieve-interpreter.h"
+#include "sieve-runtime-trace.h"
+
+#include "ext-spamvirustest-common.h"
+
+#include <sys/types.h>
+#include <regex.h>
+#include <ctype.h>
+
+/*
+ * Extension data
+ */
+
+enum ext_spamvirustest_status_type {
+	EXT_SPAMVIRUSTEST_STATUS_TYPE_SCORE,
+	EXT_SPAMVIRUSTEST_STATUS_TYPE_STRLEN,
+	EXT_SPAMVIRUSTEST_STATUS_TYPE_TEXT,
+};
+
+struct ext_spamvirustest_header_spec {
+	const char *header_name;
+	regex_t regexp;
+	bool regexp_match;
+};
+
+struct ext_spamvirustest_data {
+	pool_t pool;
+
+	int reload;
+
+	struct ext_spamvirustest_header_spec status_header;
+	struct ext_spamvirustest_header_spec max_header;
+
+	enum ext_spamvirustest_status_type status_type;
+
+	float max_value;
+
+	const char *text_values[11];
+};
+
+/*
+ * Regexp utility
+ */
+
+static bool _regexp_compile
+(regex_t *regexp, const char *data, const char **error_r)
+{
+	size_t errsize;
+	int ret;
+
+	*error_r = "";
+
+	if ( (ret=regcomp(regexp, data, REG_EXTENDED)) == 0 ) {
+		return TRUE;
+	}
+
+	errsize = regerror(ret, regexp, NULL, 0);
+
+	if ( errsize > 0 ) {
+		char *errbuf = t_malloc0(errsize);
+
+		(void)regerror(ret, regexp, errbuf, errsize);
+
+		/* We don't want the error to start with a capital letter */
+		errbuf[0] = i_tolower(errbuf[0]);
+
+		*error_r = errbuf;
+	}
+
+	return FALSE;
+}
+
+static const char *_regexp_match_get_value
+(const char *string, int index, regmatch_t pmatch[], int nmatch)
+{
+	if ( index > -1 && index < nmatch && pmatch[index].rm_so != -1 ) {
+		return t_strndup(string + pmatch[index].rm_so,
+						pmatch[index].rm_eo - pmatch[index].rm_so);
+	}
+	return NULL;
+}
+
+/*
+ * Configuration parser
+ */
+
+static bool ext_spamvirustest_header_spec_parse
+(struct ext_spamvirustest_header_spec *spec, pool_t pool, const char *data,
+	const char **error_r)
+{
+	const char *p;
+	const char *regexp_error;
+
+	if ( *data == '\0' ) {
+		*error_r = "empty header specification";
+		return FALSE;
+	}
+
+	/* Parse header name */
+
+	p = data;
+
+	while ( *p == ' ' || *p == '\t' ) p++;
+	while ( *p != ':' && *p != '\0' && *p != ' ' && *p != '\t' ) p++;
+
+	if ( *p == '\0' ) {
+		spec->header_name = p_strdup(pool, data);
+		return TRUE;
+	}
+
+	spec->header_name = p_strdup_until(pool, data, p);
+	while ( *p == ' ' || *p == '\t' ) p++;
+
+	if ( *p == '\0' ) {
+		spec->regexp_match = FALSE;
+		return TRUE;
+	}
+
+	/* Parse and compile regular expression */
+
+	if ( *p != ':' ) {
+		*error_r = t_strdup_printf("expecting ':', but found '%c'", *p);
+		return FALSE;
+	}
+	p++;
+	while ( *p == ' ' || *p == '\t' ) p++;
+
+	spec->regexp_match = TRUE;
+	if ( !_regexp_compile(&spec->regexp, p, &regexp_error) ) {
+		*error_r = t_strdup_printf("failed to compile regular expression '%s': "
+			"%s", p, regexp_error);
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+static void ext_spamvirustest_header_spec_free
+(struct ext_spamvirustest_header_spec *spec)
+{
+	regfree(&spec->regexp);
+}
+
+static bool ext_spamvirustest_parse_strlen_value
+(const char *str_value, float *value_r, const char **error_r)
+{
+	const char *p = str_value;
+	char ch = *p;
+
+	if ( *str_value == '\0' ) {
+		*value_r = 0;
+		return TRUE;
+	}
+
+	while ( *p == ch ) p++;
+
+	if ( *p != '\0' ) {
+		*error_r = t_strdup_printf(
+			"different character '%c' encountered in strlen value",
+			*p);
+		return FALSE;
+	}
+
+	*value_r = ( p - str_value );
+
+	return TRUE;
+}
+
+static bool ext_spamvirustest_parse_decimal_value
+(const char *str_value, float *value_r, const char **error_r)
+{
+	const char *p = str_value;
+	float value;
+	float sign = 1;
+	int digits;
+
+	if ( *p == '\0' ) {
+		*error_r = "empty value";
+		return FALSE;
+	}
+
+	if ( *p == '+' || *p == '-' ) {
+		if ( *p == '-' )
+			sign = -1;
+
+		p++;
+	}
+
+	value = 0;
+	digits = 0;
+	while ( i_isdigit(*p) ) {
+		value = value*10 + (*p-'0');
+		if ( digits++ > 4 ) {
+			*error_r = t_strdup_printf
+				("decimal value has too many digits before radix point: %s",
+					str_value);
+			return FALSE;
+		}
+		p++;
+	}
+
+	if ( *p == '.' || *p == ',' ) {
+		float radix = .1;
+		p++;
+
+		digits = 0;
+		while ( i_isdigit(*p) ) {
+			value = value + (*p-'0')*radix;
+
+			if ( digits++ > 4 ) {
+				*error_r = t_strdup_printf
+					("decimal value has too many digits after radix point: %s",
+						str_value);
+				return FALSE;
+			}
+			radix /= 10;
+			p++;
+		}
+	}
+
+	if ( *p != '\0' ) {
+		*error_r = t_strdup_printf
+			("invalid decimal point value: %s", str_value);
+		return FALSE;
+	}
+
+	*value_r = value * sign;
+
+	return TRUE;
+}
+
+/*
+ * Extension initialization
+ */
+
+bool ext_spamvirustest_load
+(const struct sieve_extension *ext, void **context)
+{
+	struct ext_spamvirustest_data *ext_data =
+		(struct ext_spamvirustest_data *) *context;
+	struct sieve_instance *svinst = ext->svinst;
+	const char *ext_name, *status_header, *max_header, *status_type,
+		*max_value;
+	enum ext_spamvirustest_status_type type;
+	const char *error;
+	pool_t pool;
+	bool result = TRUE;
+	int reload = 0;
+
+	if ( *context != NULL ) {
+		reload = ext_data->reload + 1;
+		ext_spamvirustest_unload(ext);
+		*context = NULL;
+	}
+
+	/* FIXME:
+	 *   Prevent loading of both spamtest and spamtestplus: let these share
+	 *   contexts.
+	 */
+
+	if ( sieve_extension_is(ext, spamtest_extension) ||
+		sieve_extension_is(ext, spamtestplus_extension) ) {
+		ext_name = spamtest_extension.name;
+	} else {
+		ext_name = sieve_extension_name(ext);
+	}
+
+	/* Get settings */
+
+	status_header = sieve_setting_get
+		(svinst, t_strconcat("sieve_", ext_name, "_status_header", NULL));
+	status_type = sieve_setting_get
+		(svinst, t_strconcat("sieve_", ext_name, "_status_type", NULL));
+	max_header = sieve_setting_get
+		(svinst, t_strconcat("sieve_", ext_name, "_max_header", NULL));
+	max_value = sieve_setting_get
+		(svinst, t_strconcat("sieve_", ext_name, "_max_value", NULL));
+
+	/* Base configuration */
+
+	if ( status_header == NULL ) {
+		return TRUE;
+	}
+
+	if ( status_type == NULL || strcmp(status_type, "score") == 0 ) {
+		type = EXT_SPAMVIRUSTEST_STATUS_TYPE_SCORE;
+	} else if ( strcmp(status_type, "strlen") == 0 ) {
+		type = EXT_SPAMVIRUSTEST_STATUS_TYPE_STRLEN;
+	} else if ( strcmp(status_type, "text") == 0 ) {
+		type = EXT_SPAMVIRUSTEST_STATUS_TYPE_TEXT;
+	} else {
+		e_error(svinst->event, "%s: "
+			"invalid status type '%s'", ext_name, status_type);
+		return FALSE;
+	}
+
+	/* Verify settings */
+
+	if ( type != EXT_SPAMVIRUSTEST_STATUS_TYPE_TEXT ) {
+
+		if ( max_header != NULL && max_value != NULL ) {
+			e_error(svinst->event, "%s: "
+				"sieve_%s_max_header and sieve_%s_max_value "
+				"cannot both be configured",
+				ext_name, ext_name, ext_name);
+			return TRUE;
+		}
+
+		if ( max_header == NULL && max_value == NULL ) {
+			e_error(svinst->event, "%s: "
+				"none of sieve_%s_max_header or sieve_%s_max_value "
+				"is configured", ext_name, ext_name, ext_name);
+			return TRUE;
+		}
+	} else {
+		if ( max_header != NULL ) {
+			e_warning(svinst->event, "%s: "
+				  "setting sieve_%s_max_header has no meaning "
+				  "for sieve_%s_status_type=text",
+				  ext_name, ext_name, ext_name);
+		}
+
+		if ( max_value != NULL ) {
+			e_warning(svinst->event, "%s: "
+				  "setting sieve_%s_max_value has no meaning "
+				  "for sieve_%s_status_type=text",
+				  ext_name, ext_name, ext_name);
+		}
+	}
+
+	pool = pool_alloconly_create("spamvirustest_data", 512);
+	ext_data = p_new(pool, struct ext_spamvirustest_data, 1);
+	ext_data->pool = pool;
+	ext_data->reload = reload;
+	ext_data->status_type = type;
+
+	if ( !ext_spamvirustest_header_spec_parse
+		(&ext_data->status_header, ext_data->pool, status_header, &error) ) {
+		e_error(svinst->event, "%s: "
+			"invalid status header specification '%s': %s",
+			ext_name, status_header, error);
+		result = FALSE;
+	}
+
+	if ( result ) {
+		if ( type != EXT_SPAMVIRUSTEST_STATUS_TYPE_TEXT ) {
+			/* Parse max header */
+
+			if ( max_header != NULL && !ext_spamvirustest_header_spec_parse
+				(&ext_data->max_header, ext_data->pool, max_header, &error) ) {
+				e_error(svinst->event, "%s: "
+					"invalid max header specification "
+					"'%s': %s", ext_name, max_header,
+					error);
+				result = FALSE;
+			}
+
+			/* Parse max value */
+
+			if ( result && max_value != NULL ) {
+				if ( !ext_spamvirustest_parse_decimal_value
+					(max_value, &ext_data->max_value, &error) ) {
+					e_error(svinst->event, "%s: "
+						"invalid max value specification "
+						"'%s': %s", ext_name, max_value,
+						error);
+					result = FALSE;
+				}
+			}
+
+		} else {
+			unsigned int i, max_text;
+
+			max_text = ( sieve_extension_is(ext, virustest_extension) ? 5 : 10 );
+
+			/* Get text values */
+			for ( i = 0; i <= max_text; i++ ) {
+				const char *value = sieve_setting_get
+					(svinst, t_strdup_printf("sieve_%s_text_value%d", ext_name, i));
+
+				if ( value != NULL && *value != '\0' )
+					ext_data->text_values[i] = p_strdup(ext_data->pool, value);
+			}
+
+			ext_data->max_value = 1;
+		}
+	}
+
+	if ( result ) {
+		*context = (void *) ext_data;
+	} else {
+		e_warning(svinst->event, "%s: "
+			  "extension not configured, "
+			  "tests will always match against \"0\"",
+			  ext_name);
+		ext_spamvirustest_unload(ext);
+		*context = NULL;
+	}
+
+	return result;
+}
+
+void ext_spamvirustest_unload(const struct sieve_extension *ext)
+{
+	struct ext_spamvirustest_data *ext_data =
+		(struct ext_spamvirustest_data *) ext->context;
+
+	if ( ext_data != NULL ) {
+		ext_spamvirustest_header_spec_free(&ext_data->status_header);
+		ext_spamvirustest_header_spec_free(&ext_data->max_header);
+		pool_unref(&ext_data->pool);
+	}
+}
+
+/*
+ * Runtime
+ */
+
+struct ext_spamvirustest_message_context {
+	int reload;
+	float score_ratio;
+};
+
+static const char *ext_spamvirustest_get_score
+(const struct sieve_extension *ext, float score_ratio, bool percent)
+{
+	int score;
+
+	if ( score_ratio < 0 )
+		return "0";
+
+	if ( score_ratio > 1 )
+		score_ratio = 1;
+
+	if ( percent )
+		score = score_ratio * 100 + 0.001;
+	else if ( sieve_extension_is(ext, virustest_extension) )
+		score = score_ratio * 4 + 1.001;
+	else
+		score = score_ratio * 9 + 1.001;
+
+	return t_strdup_printf("%d", score);
+}
+
+int ext_spamvirustest_get_value
+(const struct sieve_runtime_env *renv, const struct sieve_extension *ext,
+	 bool percent, const char **value_r)
+{
+	struct ext_spamvirustest_data *ext_data =
+		(struct ext_spamvirustest_data *) ext->context;
+	struct ext_spamvirustest_header_spec *status_header, *max_header;
+	struct sieve_message_context *msgctx = renv->msgctx;
+	struct ext_spamvirustest_message_context *mctx;
+	struct mail *mail;
+	regmatch_t match_values[2];
+	const char *header_value, *error;
+	const char *status = NULL, *max = NULL;
+	float status_value, max_value;
+	unsigned int i, max_text;
+	pool_t pool = sieve_interpreter_pool(renv->interp);
+
+	*value_r = "0";
+
+	/*
+	 * Check whether extension is properly configured
+	 */
+	if ( ext_data == NULL ) {
+		sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+			"error: extension not configured");
+		return SIEVE_EXEC_OK;
+	}
+
+	/*
+	 * Check wether a cached result is available
+	 */
+
+	mctx = 	(struct ext_spamvirustest_message_context *)
+		sieve_message_context_extension_get(msgctx, ext);
+
+	if ( mctx == NULL ) {
+		/* Create new context */
+		mctx = p_new(pool, struct ext_spamvirustest_message_context, 1);
+		sieve_message_context_extension_set(msgctx, ext, (void *)mctx);
+	} else if ( mctx->reload == ext_data->reload ) {
+		/* Use cached result */
+		*value_r = ext_spamvirustest_get_score(ext, mctx->score_ratio, percent);
+		return SIEVE_EXEC_OK;
+	} else {
+		/* Extension was reloaded (probably in testsuite) */
+	}
+
+	mctx->reload = ext_data->reload;
+
+	/*
+	 * Get max status value
+	 */
+
+	mail = sieve_message_get_mail(renv->msgctx);
+	status_header = &ext_data->status_header;
+	max_header = &ext_data->max_header;
+
+	if ( ext_data->status_type != EXT_SPAMVIRUSTEST_STATUS_TYPE_TEXT ) {
+		if ( max_header->header_name != NULL ) {
+			/* Get header from message */
+			if ( mail_get_first_header_utf8
+				(mail, max_header->header_name, &header_value) < 0 ) {
+				return sieve_runtime_mail_error	(renv, mail,
+					"%s test: failed to read header field `%s'",
+					sieve_extension_name(ext), max_header->header_name);
+			}
+			if (	header_value == NULL ) {
+				sieve_runtime_trace(renv,  SIEVE_TRLVL_TESTS,
+					"header '%s' not found in message",
+					max_header->header_name);
+				goto failed;
+			}
+
+			if ( max_header->regexp_match ) {
+				/* Execute regex */
+				if ( regexec(&max_header->regexp, header_value, 2, match_values, 0)
+					!= 0 ) {
+					sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+						"regexp for header '%s' did not match "
+						"on value '%s'", max_header->header_name, header_value);
+					goto failed;
+				}
+
+				max = _regexp_match_get_value(header_value, 1, match_values, 2);
+				if ( max == NULL ) {
+					sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+						"regexp did not return match value "
+						"for string '%s'", header_value);
+					goto failed;
+				}
+			} else {
+				max = header_value;
+			}
+
+			if ( !ext_spamvirustest_parse_decimal_value(max, &max_value, &error) ) {
+				sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+					"failed to parse maximum value: %s", error);
+				goto failed;
+			}
+		} else {
+			max_value = ext_data->max_value;
+		}
+
+		if ( max_value == 0 ) {
+			sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+				"error: max value is 0");
+			goto failed;
+		}
+	} else {
+		max_value = ( sieve_extension_is(ext, virustest_extension) ? 5 : 10 );
+	}
+
+	/*
+	 * Get status value
+	 */
+
+	/* Get header from message */
+	if ( mail_get_first_header_utf8
+		(mail, status_header->header_name, &header_value) < 0 ) {
+		return sieve_runtime_mail_error	(renv, mail,
+			"%s test: failed to read header field `%s'",
+			sieve_extension_name(ext), status_header->header_name);
+	}
+	if ( header_value == NULL ) {
+		sieve_runtime_trace(renv,  SIEVE_TRLVL_TESTS,
+			"header '%s' not found in message",
+			status_header->header_name);
+		goto failed;
+	}
+
+	/* Execute regex */
+	if ( status_header->regexp_match ) {
+		if ( regexec(&status_header->regexp, header_value, 2, match_values, 0)
+			!= 0 ) {
+			sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+				"regexp for header '%s' did not match on value '%s'",
+				status_header->header_name, header_value);
+			goto failed;
+		}
+
+		status = _regexp_match_get_value(header_value, 1, match_values, 2);
+		if ( status == NULL ) {
+			sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+				"regexp did not return match value for string '%s'",
+				header_value);
+			goto failed;
+		}
+	} else {
+		status = header_value;
+	}
+
+	switch ( ext_data->status_type ) {
+	case EXT_SPAMVIRUSTEST_STATUS_TYPE_SCORE:
+		if ( !ext_spamvirustest_parse_decimal_value
+			(status, &status_value, &error) ) {
+			sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+				"failed to parse status value '%s': %s",
+				status, error);
+			goto failed;
+		}
+		break;
+	case EXT_SPAMVIRUSTEST_STATUS_TYPE_STRLEN:
+		if ( !ext_spamvirustest_parse_strlen_value
+			(status, &status_value, &error) ) {
+			sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+				"failed to parse status value '%s': %s",
+				status, error);
+			goto failed;
+		}
+		break;
+	case EXT_SPAMVIRUSTEST_STATUS_TYPE_TEXT:
+		max_text = ( sieve_extension_is(ext, virustest_extension) ? 5 : 10 );
+		status_value = 0;
+
+		i = 0;
+		while ( i <= max_text ) {
+			if ( ext_data->text_values[i] != NULL &&
+				strcmp(status, ext_data->text_values[i]) == 0 ) {
+				status_value = (float) i;
+				break;
+			}
+			i++;
+		}
+
+		if ( i > max_text ) {
+			sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+				"failed to match textstatus value '%s'",
+				status);
+			goto failed;
+		}
+		break;
+	default:
+		i_unreached();
+		break;
+	}
+
+	/* Calculate value */
+	if ( status_value < 0 )
+		mctx->score_ratio = 0;
+	else if ( status_value > max_value )
+		mctx->score_ratio = 1;
+	else
+		mctx->score_ratio = (status_value / max_value);
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+		"extracted score=%.3f, max=%.3f, ratio=%.0f %%",
+		status_value, max_value, mctx->score_ratio * 100);
+
+	*value_r = ext_spamvirustest_get_score(ext, mctx->score_ratio, percent);
+	return SIEVE_EXEC_OK;
+
+failed:
+	mctx->score_ratio = -1;
+	*value_r = "0";
+	return SIEVE_EXEC_OK;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/spamvirustest/ext-spamvirustest-common.h b/pigeonhole/src/lib-sieve/plugins/spamvirustest/ext-spamvirustest-common.h
new file mode 100644
index 0000000..331a637
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/spamvirustest/ext-spamvirustest-common.h
@@ -0,0 +1,35 @@
+#ifndef EXT_SPAMVIRUSTEST_COMMON_H
+#define EXT_SPAMVIRUSTEST_COMMON_H
+
+#include "sieve-common.h"
+
+/*
+ * Extensions
+ */
+
+extern const struct sieve_extension_def spamtest_extension;
+extern const struct sieve_extension_def spamtestplus_extension;
+extern const struct sieve_extension_def virustest_extension;
+
+bool ext_spamvirustest_load(const struct sieve_extension *ext, void **context);
+void ext_spamvirustest_unload(const struct sieve_extension *ext);
+
+/*
+ * Tests
+ */
+
+extern const struct sieve_command_def spamtest_test;
+extern const struct sieve_command_def virustest_test;
+
+int ext_spamvirustest_get_value
+(const struct sieve_runtime_env *renv, const struct sieve_extension *ext,
+	 bool percent, const char **value_r);
+
+/*
+ * Operations
+ */
+
+extern const struct sieve_operation_def spamtest_operation;
+extern const struct sieve_operation_def virustest_operation;
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/spamvirustest/ext-spamvirustest.c b/pigeonhole/src/lib-sieve/plugins/spamvirustest/ext-spamvirustest.c
new file mode 100644
index 0000000..e0c9b54
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/spamvirustest/ext-spamvirustest.c
@@ -0,0 +1,146 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extensions spamtest, spamtestplus and virustest
+ * -----------------------------------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 5235
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+/* Configuration examples:
+ *
+ * # 1: X-Spam-Score: No, score=-3.2
+ *
+ * sieve_spamtest_status_header = \
+ *   X-Spam-Score: [[:alnum:]]+, score=(-?[[:digit:]]+\.[[:digit:]])
+ * sieve_spamtest_max_value = 5.0
+ *
+ * # 2: X-Spam-Status: Yes
+ *
+ * sieve_spamtest_status_header = X-Spam-Status
+ * sieve_spamtest_status_type = yesno
+ * sieve_spamtest_max_value = Yes
+ *
+ * # 3: X-Spam-Score: sssssss
+ * sieve_spamtest_status_header = X-Spam-Score
+ * sieve_spamtest_status_type = strlen
+ * sieve_spamtest_max_value = 5
+ *
+ * # 4: X-Spam-Score: status=3.2 required=5.0
+ *
+ * sieve_spamtest_status_header = \
+ *   X-Spam-Score: score=(-?[[:digit:]]+\.[[:digit:]]).*
+ * sieve_spamtest_max_header = \
+ *   X-Spam-Score: score=-?[[:digit:]]+\.[[:digit:]] required=([[:digit:]]+\.[[:digit:]])
+ *
+ * # 5: X-Virus-Scan: Found to be clean.
+ *
+ * sieve_virustest_status_header = \
+ *   X-Virus-Scan: Found to be (.+)\.
+ * sieve_virustest_status_type = text
+ * sieve_virustest_text_value1 = clean
+ * sieve_virustest_text_value5 = infected
+ */
+
+#include "lib.h"
+#include "array.h"
+
+#include "sieve-common.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+
+#include "sieve-validator.h"
+
+#include "ext-spamvirustest-common.h"
+
+/*
+ * Extensions
+ */
+
+/* Spamtest */
+
+static bool ext_spamvirustest_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *validator);
+
+const struct sieve_extension_def spamtest_extension = {
+	.name = "spamtest",
+	.load = ext_spamvirustest_load,
+	.unload = ext_spamvirustest_unload,
+	.validator_load = ext_spamvirustest_validator_load,
+	SIEVE_EXT_DEFINE_OPERATION(spamtest_operation)
+};
+
+const struct sieve_extension_def spamtestplus_extension = {
+	.name = "spamtestplus",
+	.load = ext_spamvirustest_load,
+	.unload = ext_spamvirustest_unload,
+	.validator_load = ext_spamvirustest_validator_load,
+	SIEVE_EXT_DEFINE_OPERATION(spamtest_operation)
+};
+
+const struct sieve_extension_def virustest_extension = {
+	.name = "virustest",
+	.load = ext_spamvirustest_load,
+	.unload = ext_spamvirustest_unload,
+	.validator_load = ext_spamvirustest_validator_load,
+	SIEVE_EXT_DEFINE_OPERATION(virustest_operation)
+};
+
+/*
+ * Implementation
+ */
+
+static bool ext_spamtest_validator_check_conflict
+	(const struct sieve_extension *ext,
+		struct sieve_validator *valdtr, void *context,
+		struct sieve_ast_argument *require_arg,
+		const struct sieve_extension *ext_other,
+		bool required);
+
+const struct sieve_validator_extension spamtest_validator_extension = {
+	.ext = &spamtest_extension,
+	.check_conflict = ext_spamtest_validator_check_conflict
+};
+
+static bool ext_spamvirustest_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	/* Register new test */
+
+	if ( sieve_extension_is(ext, virustest_extension) ) {
+		sieve_validator_register_command(valdtr, ext, &virustest_test);
+	} else {
+		if ( sieve_extension_is(ext, spamtest_extension) ) {
+			/* Register validator extension to warn for duplicate */
+			sieve_validator_extension_register
+				(valdtr, ext, &spamtest_validator_extension, NULL);
+		}
+
+		sieve_validator_register_command(valdtr, ext, &spamtest_test);
+	}
+
+	return TRUE;
+}
+
+static bool ext_spamtest_validator_check_conflict
+(const struct sieve_extension *ext ATTR_UNUSED,
+	struct sieve_validator *valdtr, void *context ATTR_UNUSED,
+	struct sieve_ast_argument *require_arg,
+	const struct sieve_extension *ext_other,
+	bool required ATTR_UNUSED)
+{
+	if ( sieve_extension_name_is(ext_other, "spamtestplus") ) {
+		sieve_argument_validate_warning(valdtr, require_arg,
+			"the spamtest and spamtestplus extensions should "
+			"not be specified at the same time");
+	}
+
+	return TRUE;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/spamvirustest/tst-spamvirustest.c b/pigeonhole/src/lib-sieve/plugins/spamvirustest/tst-spamvirustest.c
new file mode 100644
index 0000000..26d051e
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/spamvirustest/tst-spamvirustest.c
@@ -0,0 +1,304 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+
+#include "sieve-common.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-address-parts.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-match.h"
+
+#include "ext-spamvirustest-common.h"
+
+/*
+ * Tests
+ */
+
+static bool tst_spamvirustest_validate
+	(struct sieve_validator *valdtr, struct sieve_command *tst);
+static bool tst_spamvirustest_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx);
+static bool tst_spamvirustest_registered
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+
+/* Spamtest test
+ *
+ * Syntax:
+ *   spamtest [":percent"] [COMPARATOR] [MATCH-TYPE] <value: string>
+ */
+
+const struct sieve_command_def spamtest_test = {
+	.identifier = "spamtest",
+	.type = SCT_TEST,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = tst_spamvirustest_registered,
+	.validate = tst_spamvirustest_validate,
+	.generate = tst_spamvirustest_generate
+};
+
+/* Virustest test
+ *
+ * Syntax:
+ *   virustest [COMPARATOR] [MATCH-TYPE] <value: string>
+ */
+
+const struct sieve_command_def virustest_test = {
+	.identifier = "virustest",
+	.type = SCT_TEST,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = tst_spamvirustest_registered,
+	.validate = tst_spamvirustest_validate,
+	.generate = tst_spamvirustest_generate
+};
+
+/*
+ * Tagged arguments
+ */
+
+static bool tst_spamtest_validate_percent_tag
+	(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *tst);
+
+static const struct sieve_argument_def spamtest_percent_tag = {
+ 	.identifier = "percent",
+	.validate = tst_spamtest_validate_percent_tag
+};
+
+/*
+ * Spamtest and virustest operations
+ */
+
+static bool tst_spamvirustest_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int tst_spamvirustest_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def spamtest_operation = {
+	.mnemonic = "SPAMTEST",
+	.ext_def = &spamtest_extension,
+	.dump = tst_spamvirustest_operation_dump,
+	.execute = tst_spamvirustest_operation_execute
+};
+
+const struct sieve_operation_def virustest_operation = {
+	.mnemonic = "VIRUSTEST",
+	.ext_def = &virustest_extension,
+	.dump = tst_spamvirustest_operation_dump,
+	.execute = tst_spamvirustest_operation_execute
+};
+
+/*
+ * Optional operands
+ */
+
+enum tst_spamvirustest_optional {
+	OPT_SPAMTEST_PERCENT = SIEVE_MATCH_OPT_LAST,
+	OPT_SPAMTEST_LAST
+};
+
+/*
+ * Test registration
+ */
+
+static bool tst_spamvirustest_registered
+(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+	struct sieve_command_registration *cmd_reg)
+{
+	sieve_comparators_link_tag(valdtr, cmd_reg, SIEVE_MATCH_OPT_COMPARATOR);
+	sieve_match_types_link_tags(valdtr, cmd_reg, SIEVE_MATCH_OPT_MATCH_TYPE);
+
+	if ( sieve_extension_is(ext, spamtestplus_extension) ||
+		sieve_extension_is(ext, spamtest_extension) ) {
+		sieve_validator_register_tag
+			(valdtr, cmd_reg, ext, &spamtest_percent_tag, OPT_SPAMTEST_PERCENT);
+	}
+
+	return TRUE;
+}
+
+/*
+ * Validation
+ */
+
+static bool tst_spamtest_validate_percent_tag
+(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+	struct sieve_command *tst)
+{
+	if ( !sieve_extension_is(tst->ext, spamtestplus_extension) ) {
+		sieve_argument_validate_error(valdtr, *arg,
+			"the spamtest test only accepts the :percent argument when "
+			"the spamtestplus extension is active");
+		return FALSE;
+	}
+
+	/* Skip tag */
+	*arg = sieve_ast_argument_next(*arg);
+
+	return TRUE;
+}
+
+static bool tst_spamvirustest_validate
+(struct sieve_validator *valdtr, struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+	const struct sieve_match_type mcht_default =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	const struct sieve_comparator cmp_default =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+
+	/* Check value */
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "value", 1, SAAT_STRING) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, tst, arg, FALSE) )
+		return FALSE;
+
+	/* Validate the key argument to a specified match type */
+	return sieve_match_type_validate
+		(valdtr, tst, arg, &mcht_default, &cmp_default);
+}
+
+/*
+ * Code generation
+ */
+
+static bool tst_spamvirustest_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *tst)
+{
+	if ( sieve_command_is(tst, spamtest_test) )
+		sieve_operation_emit(cgenv->sblock, tst->ext, &spamtest_operation);
+	else if ( sieve_command_is(tst, virustest_test) )
+		sieve_operation_emit(cgenv->sblock, tst->ext, &virustest_operation);
+	else
+		i_unreached();
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, tst, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool tst_spamvirustest_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	int opt_code = 0;
+	const struct sieve_operation *op = denv->oprtn;
+
+	sieve_code_dumpf(denv, "%s", sieve_operation_mnemonic(op));
+	sieve_code_descend(denv);
+
+	/* Optional operands */
+	for (;;) {
+		int opt;
+
+		if ( (opt=sieve_match_opr_optional_dump(denv, address, &opt_code)) < 0 )
+			return FALSE;
+
+		if ( opt == 0 ) break;
+
+		switch ( opt_code ) {
+		case OPT_SPAMTEST_PERCENT:
+			sieve_code_dumpf(denv, "percent");
+			break;
+    default:
+			return FALSE;
+		}
+	}
+
+	return
+		sieve_opr_string_dump(denv, address, "value");
+}
+
+/*
+ * Code execution
+ */
+
+static int tst_spamvirustest_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	const struct sieve_operation *op = renv->oprtn;
+	const struct sieve_extension *this_ext = op->ext;
+	int opt_code = 0;
+	struct sieve_match_type mcht =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	struct sieve_comparator cmp =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+	bool percent = FALSE;
+	struct sieve_stringlist *value_list, *key_list;
+	const char *score_value;
+	int match, ret;
+
+	/* Read optional operands */
+	for (;;) {
+		int opt;
+
+		if ( (opt=sieve_match_opr_optional_read
+			(renv, address, &opt_code, &ret, &cmp, &mcht)) < 0 )
+			return ret;
+
+		if ( opt == 0 ) break;
+
+		switch ( opt_code ) {
+		case OPT_SPAMTEST_PERCENT:
+			percent = TRUE;
+			break;
+		default:
+			sieve_runtime_trace_error(renv, "unknown optional operand");
+			return SIEVE_EXEC_BIN_CORRUPT;
+		}
+	}
+
+	/* Read value part */
+	if ( (ret=sieve_opr_stringlist_read(renv, address, "value", &key_list)) <= 0 )
+		return ret;
+
+	/* Perform test */
+
+	if ( sieve_operation_is(op, spamtest_operation) ) {
+		sieve_runtime_trace
+			(renv, SIEVE_TRLVL_TESTS, "spamtest test [percent=%s]",
+				( percent ? "true" : "false" ));
+	} else {
+		sieve_runtime_trace
+			(renv, SIEVE_TRLVL_TESTS, "virustest test");
+	}
+
+	/* Get score value */
+	sieve_runtime_trace_descend(renv);
+	if ( (ret=ext_spamvirustest_get_value
+		(renv, this_ext, percent, &score_value)) <= 0 )
+		return ret;
+	sieve_runtime_trace_ascend(renv);
+
+	/* Construct value list */
+	value_list = sieve_single_stringlist_create_cstr(renv, score_value, TRUE);
+
+	/* Perform match */
+	if ( (match=sieve_match(renv, &mcht, &cmp, value_list, key_list, &ret)) < 0 )
+		return ret;
+
+	/* Set test result for subsequent conditional jump */
+	sieve_interpreter_set_test_result(renv->interp, match > 0);
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/special-use/Makefile.am b/pigeonhole/src/lib-sieve/plugins/special-use/Makefile.am
new file mode 100644
index 0000000..0f31aee
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/special-use/Makefile.am
@@ -0,0 +1,22 @@
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+
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+
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+
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+	$(tags) \
+	$(tests) \
+	ext-special-use-common.c \
+	ext-special-use.c
+
+headers = \
+	ext-special-use-common.h
+
+noinst_HEADERS = $(headers)
diff --git a/pigeonhole/src/lib-sieve/plugins/special-use/Makefile.in b/pigeonhole/src/lib-sieve/plugins/special-use/Makefile.in
new file mode 100644
index 0000000..5032dae
--- /dev/null
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+psdir = @psdir@
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+top_srcdir = @top_srcdir@
+noinst_LTLIBRARIES = libsieve_ext_special_use.la
+AM_CPPFLAGS = \
+	-I$(srcdir)/../.. \
+	$(LIBDOVECOT_INCLUDE)
+
+tags = \
+	tag-specialuse.c
+
+tests = \
+	tst-specialuse-exists.c
+
+libsieve_ext_special_use_la_SOURCES = \
+	$(tags) \
+	$(tests) \
+	ext-special-use-common.c \
+	ext-special-use.c
+
+headers = \
+	ext-special-use-common.h
+
+noinst_HEADERS = $(headers)
+all: all-am
+
+.SUFFIXES:
+.SUFFIXES: .c .lo .o .obj
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/lib-sieve/plugins/special-use/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/lib-sieve/plugins/special-use/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4): @MAINTAINER_MODE_TRUE@ $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+
+clean-noinstLTLIBRARIES:
+	-test -z "$(noinst_LTLIBRARIES)" || rm -f $(noinst_LTLIBRARIES)
+	@list='$(noinst_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+libsieve_ext_special_use.la: $(libsieve_ext_special_use_la_OBJECTS) $(libsieve_ext_special_use_la_DEPENDENCIES) $(EXTRA_libsieve_ext_special_use_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(LINK)  $(libsieve_ext_special_use_la_OBJECTS) $(libsieve_ext_special_use_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-special-use-common.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-special-use.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/tag-specialuse.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/tst-specialuse-exists.Plo@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
+am--depfiles: $(am__depfiles_remade)
+
+.c.o:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(COMPILE) -c -o $@ $<
+
+.c.obj:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ `$(CYGPATH_W) '$<'`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(COMPILE) -c -o $@ `$(CYGPATH_W) '$<'`
+
+.c.lo:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(LTCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LTCOMPILE) -c -o $@ $<
+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+
+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
+tags: tags-am
+TAGS: tags
+
+tags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	set x; \
+	here=`pwd`; \
+	$(am__define_uniq_tagged_files); \
+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-am
+
+CTAGS: ctags
+ctags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
+cscopelist: cscopelist-am
+
+cscopelist-am: $(am__tagged_files)
+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(LTLIBRARIES) $(HEADERS)
+installdirs:
+install: install-am
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+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/ext-special-use-common.Plo
+	-rm -f ./$(DEPDIR)/ext-special-use.Plo
+	-rm -f ./$(DEPDIR)/tag-specialuse.Plo
+	-rm -f ./$(DEPDIR)/tst-specialuse-exists.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
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+info: info-am
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+install-dvi-am:
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+install-exec-am:
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+install-html: install-html-am
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+install-pdf-am:
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+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/ext-special-use-common.Plo
+	-rm -f ./$(DEPDIR)/ext-special-use.Plo
+	-rm -f ./$(DEPDIR)/tag-specialuse.Plo
+	-rm -f ./$(DEPDIR)/tst-specialuse-exists.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
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+pdf: pdf-am
+
+pdf-am:
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+ps: ps-am
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+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/special-use/ext-special-use-common.c b/pigeonhole/src/lib-sieve/plugins/special-use/ext-special-use-common.c
new file mode 100644
index 0000000..fcaf1b5
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/special-use/ext-special-use-common.c
@@ -0,0 +1,31 @@
+/* Copyright (c) 2019 Pigeonhole authors, see the included COPYING file */
+
+#include "lib.h"
+#include "imap-arg.h"
+
+#include "ext-special-use-common.h"
+
+bool ext_special_use_flag_valid(const char *flag)
+{
+	const char *p = flag;
+
+	/* RFC 6154, Section 6:
+
+	   use-attr        =  "\All" / "\Archive" / "\Drafts" / "\Flagged" /
+	                      "\Junk" / "\Sent" / "\Trash" / use-attr-ext
+	   use-attr-ext    =  "\" atom
+	 */
+
+	/* "\" */
+	if (*p != '\\')
+		return FALSE;
+	p++;
+
+	/* atom */
+	for (; *p != '\0'; p++) {
+		if (!IS_ATOM_CHAR(*p))
+			return FALSE;
+	}
+
+	return TRUE;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/special-use/ext-special-use-common.h b/pigeonhole/src/lib-sieve/plugins/special-use/ext-special-use-common.h
new file mode 100644
index 0000000..61f23d0
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/special-use/ext-special-use-common.h
@@ -0,0 +1,43 @@
+#ifndef EXT_SPECIAL_USE_COMMON_H
+#define EXT_SPECIAL_USE_COMMON_H
+
+#include "sieve-common.h"
+
+/*
+ * Tagged arguments
+ */
+
+extern const struct sieve_argument_def specialuse_tag;
+
+/*
+ * Commands
+ */
+
+extern const struct sieve_command_def specialuse_exists_test;
+
+/*
+ * Operands
+ */
+
+extern const struct sieve_operand_def specialuse_operand;
+
+/*
+ * Operations
+ */
+
+extern const struct sieve_operation_def specialuse_exists_operation;
+
+/*
+ * Extension
+ */
+
+extern const struct sieve_extension_def special_use_extension;
+
+/*
+ * Flag checking
+ */
+
+bool ext_special_use_flag_valid(const char *flag);
+
+#endif /* EXT_SPECIAL_USE_COMMON_H */
+
diff --git a/pigeonhole/src/lib-sieve/plugins/special-use/ext-special-use.c b/pigeonhole/src/lib-sieve/plugins/special-use/ext-special-use.c
new file mode 100644
index 0000000..acbb13e
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/special-use/ext-special-use.c
@@ -0,0 +1,57 @@
+/* Copyright (c) 2019 Pigeonhole authors, see the included COPYING file */
+
+/* Extension special-use
+ * ---------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 8579
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "sieve-common.h"
+
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-actions.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-result.h"
+
+#include "ext-special-use-common.h"
+
+/*
+ * Extension
+ */
+
+static bool
+ext_special_use_validator_load(const struct sieve_extension *ext,
+			       struct sieve_validator *valdtr);
+
+const struct sieve_extension_def special_use_extension = {
+	.name = "special-use",
+	.validator_load = ext_special_use_validator_load,
+	SIEVE_EXT_DEFINE_OPERATION(specialuse_exists_operation),
+	SIEVE_EXT_DEFINE_OPERAND(specialuse_operand)
+};
+
+static bool
+ext_special_use_validator_load(const struct sieve_extension *ext,
+			       struct sieve_validator *valdtr)
+{
+	/* Register :specialuse tag with fileinto command and we don't care
+	   whether this command is registered or even whether it will be
+	   registered at all. The validator handles either situation gracefully.
+	 */
+	sieve_validator_register_external_tag(
+		valdtr, "fileinto", ext, &specialuse_tag,
+		SIEVE_OPT_SIDE_EFFECT);
+
+	/* Register new test */
+	sieve_validator_register_command(valdtr, ext, &specialuse_exists_test);
+
+	return TRUE;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/special-use/tag-specialuse.c b/pigeonhole/src/lib-sieve/plugins/special-use/tag-specialuse.c
new file mode 100644
index 0000000..0f6d32a
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/special-use/tag-specialuse.c
@@ -0,0 +1,316 @@
+/* Copyright (c) 2019 Pigeonhole authors, see the included COPYING file */
+
+#include "lib.h"
+#include "str-sanitize.h"
+#include "mail-storage.h"
+#include "mail-namespace.h"
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-actions.h"
+#include "sieve-code.h"
+#include "sieve-actions.h"
+#include "sieve-result.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+
+#include "ext-special-use-common.h"
+
+/*
+ * Flags tagged argument
+ */
+
+static bool
+tag_specialuse_validate(struct sieve_validator *valdtr,
+			struct sieve_ast_argument **arg,
+			struct sieve_command *cmd);
+static bool
+tag_specialuse_generate(const struct sieve_codegen_env *cgenv,
+			struct sieve_ast_argument *arg,
+			struct sieve_command *cmd);
+
+const struct sieve_argument_def specialuse_tag = {
+	.identifier = "specialuse",
+	.validate = tag_specialuse_validate,
+	.generate = tag_specialuse_generate
+};
+
+/*
+ * Side effect
+ */
+
+static bool
+seff_specialuse_dump_context(const struct sieve_side_effect *seffect,
+			     const struct sieve_dumptime_env *denv,
+			     sieve_size_t *address);
+static int
+seff_specialuse_read_context(const struct sieve_side_effect *seffect,
+			     const struct sieve_runtime_env *renv,
+			     sieve_size_t *address, void **context);
+
+static int
+seff_specialuse_merge(const struct sieve_runtime_env *renv,
+		      const struct sieve_action *action,
+		      const struct sieve_side_effect *old_seffect,
+		      const struct sieve_side_effect *new_seffect,
+		      void **old_context);
+
+static void
+seff_specialuse_print(const struct sieve_side_effect *seffect,
+		      const struct sieve_action *action,
+		      const struct sieve_result_print_env *rpenv, bool *keep);
+
+static int
+seff_specialuse_pre_execute(const struct sieve_side_effect *seffect,
+			    const struct sieve_action_exec_env *aenv,
+			    void *tr_context, void **se_tr_context ATTR_UNUSED);
+
+const struct sieve_side_effect_def specialuse_side_effect = {
+	SIEVE_OBJECT("specialuse", &specialuse_operand, 0),
+	.precedence = 200,
+	.to_action = &act_store,
+	.dump_context = seff_specialuse_dump_context,
+	.read_context = seff_specialuse_read_context,
+	.merge = seff_specialuse_merge,
+	.print = seff_specialuse_print,
+	.pre_execute = seff_specialuse_pre_execute
+};
+
+/*
+ * Operand
+ */
+
+static const struct sieve_extension_objects ext_side_effects =
+	SIEVE_EXT_DEFINE_SIDE_EFFECT(specialuse_side_effect);
+
+const struct sieve_operand_def specialuse_operand = {
+	.name = "specialuse operand",
+	.ext_def = &special_use_extension,
+	.class = &sieve_side_effect_operand_class,
+	.interface = &ext_side_effects
+};
+
+/*
+ * Tag validation
+ */
+
+static bool
+tag_specialuse_validate(struct sieve_validator *valdtr,
+			struct sieve_ast_argument **arg,
+			struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+
+	/* Detach the tag itself */
+	*arg = sieve_ast_argument_next(*arg);
+
+	/* Check syntax:
+	 *   :specialuse <special-use-flag: string>
+	 */
+	if (!sieve_validate_tag_parameter(valdtr, cmd, tag, *arg, NULL, 0,
+					  SAAT_STRING, FALSE))
+		return FALSE;
+	if (sieve_argument_is_string_literal(*arg)) {
+		const char *use_flag = sieve_ast_argument_strc(*arg);
+
+		if (!ext_special_use_flag_valid(use_flag)) {
+			sieve_argument_validate_error(
+				valdtr, *arg, "specialuse tag: "
+				"invalid special-use flag `%s' specified",
+				str_sanitize(use_flag, 64));
+			return FALSE;
+		}
+	}
+
+	tag->parameters = *arg;
+
+	/* Detach parameter */
+	*arg = sieve_ast_arguments_detach(*arg,1);
+
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool
+tag_specialuse_generate(const struct sieve_codegen_env *cgenv,
+			struct sieve_ast_argument *arg,
+			struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *param;
+
+	if (sieve_ast_argument_type(arg) != SAAT_TAG)
+		return FALSE;
+
+	sieve_opr_side_effect_emit(cgenv->sblock, arg->argument->ext,
+				   &specialuse_side_effect);
+
+	/* Explicit :specialuse tag */
+	param = arg->parameters;
+
+	/* Call the generation function for the argument */
+	if (param->argument != NULL && param->argument->def != NULL &&
+	    param->argument->def->generate != NULL &&
+	    !param->argument->def->generate(cgenv, param, cmd))
+		return FALSE;
+
+	return TRUE;
+}
+
+/*
+ * Side effect implementation
+ */
+
+/* Context data */
+
+struct seff_specialuse_context {
+	const char *special_use_flag;
+};
+
+/* Context coding */
+
+static bool
+seff_specialuse_dump_context(
+	const struct sieve_side_effect *seffect ATTR_UNUSED,
+	const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	return sieve_opr_stringlist_dump(denv, address, "specialuse");
+}
+
+static int
+seff_specialuse_read_context(
+	const struct sieve_side_effect *seffect ATTR_UNUSED,
+	const struct sieve_runtime_env *renv, sieve_size_t *address,
+	void **se_context)
+{
+	pool_t pool = sieve_result_pool(renv->result);
+	struct seff_specialuse_context *ctx;
+	string_t *special_use_flag;
+	const char *use_flag;
+	int ret;
+
+	if ((ret = sieve_opr_string_read(renv, address, "specialuse",
+					 &special_use_flag)) <= 0)
+		return ret;
+
+	use_flag = str_c(special_use_flag);
+	if (!ext_special_use_flag_valid(use_flag)) {
+		sieve_runtime_error(
+			renv, NULL, "specialuse tag: "
+			"invalid special-use flag `%s' specified",
+			str_sanitize(use_flag, 64));
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	ctx = p_new(pool, struct seff_specialuse_context, 1);
+	ctx->special_use_flag = p_strdup(pool, use_flag);
+
+	*se_context = (void *) ctx;
+
+	return SIEVE_EXEC_OK;
+}
+
+/* Result verification */
+
+static int
+seff_specialuse_merge(const struct sieve_runtime_env *renv ATTR_UNUSED,
+		      const struct sieve_action *action ATTR_UNUSED,
+		      const struct sieve_side_effect *old_seffect ATTR_UNUSED,
+		      const struct sieve_side_effect *new_seffect,
+		      void **old_context)
+{
+	if (new_seffect != NULL)
+		*old_context = new_seffect->context;
+
+	return 1;
+}
+
+/* Result printing */
+
+static void
+seff_specialuse_print(const struct sieve_side_effect *seffect,
+		      const struct sieve_action *action ATTR_UNUSED,
+		      const struct sieve_result_print_env *rpenv,
+		      bool *keep ATTR_UNUSED)
+{
+	struct seff_specialuse_context *ctx =
+		(struct seff_specialuse_context *)seffect->context;
+
+	sieve_result_seffect_printf(
+		rpenv,
+		"use mailbox with special-use flag `%s' instead if accessible",
+		ctx->special_use_flag);
+}
+
+/* Result execution */
+
+static int
+seff_specialuse_pre_execute(const struct sieve_side_effect *seffect,
+			    const struct sieve_action_exec_env *aenv,
+			    void *tr_context, void **se_tr_context ATTR_UNUSED)
+{
+	struct seff_specialuse_context *ctx =
+		(struct seff_specialuse_context *)seffect->context;
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct act_store_transaction *trans =
+		(struct act_store_transaction *)tr_context;
+	struct mailbox *box;
+
+	if (trans->box == NULL || trans->disabled)
+		return SIEVE_EXEC_OK;
+
+	/* Check whether something already failed */
+	switch (trans->error_code) {
+	case MAIL_ERROR_NONE:
+		break;
+	case MAIL_ERROR_TEMP:
+		return SIEVE_EXEC_TEMP_FAILURE;
+	default:
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	trans->error = NULL;
+	trans->error_code = MAIL_ERROR_NONE;
+
+	box = mailbox_alloc_for_user(eenv->scriptenv->user,
+				     ctx->special_use_flag,
+				     (MAILBOX_FLAG_POST_SESSION |
+				      MAILBOX_FLAG_SPECIAL_USE));
+
+	/* We still override the allocate default mailbox with ours below even
+	   when the default and special-use mailbox are identical. Choosing
+	   either one is (currently) equal and setting trans->mailbox_identifier
+	   for SPECIAL-USE needs to be done either way, so we use the same code
+	   path. */
+
+	/* Try to open the mailbox */
+	eenv->exec_status->last_storage = mailbox_get_storage(box);
+	if (mailbox_open(box) == 0) {
+		pool_t pool = sieve_result_pool(aenv->result);
+
+		/* Success */
+		mailbox_free(&trans->box);
+		trans->box = box;
+		trans->mailbox_identifier = p_strdup_printf(pool,
+			"[SPECIAL-USE %s]", ctx->special_use_flag);
+
+	} else {
+		/* Failure */
+		if (mailbox_get_last_mail_error(box) == MAIL_ERROR_NOTFOUND) {
+			/* Not found; revert to default */
+			mailbox_free(&box);
+		} else {
+			/* Total failure */
+			mailbox_free(&trans->box);
+			trans->box = box;
+			sieve_act_store_get_storage_error(aenv, trans);
+			return (trans->error_code == MAIL_ERROR_TEMP ?
+				SIEVE_EXEC_TEMP_FAILURE : SIEVE_EXEC_FAILURE);
+		}
+	}
+
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/special-use/tst-specialuse-exists.c b/pigeonhole/src/lib-sieve/plugins/special-use/tst-specialuse-exists.c
new file mode 100644
index 0000000..a1aa878
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/special-use/tst-specialuse-exists.c
@@ -0,0 +1,525 @@
+/* Copyright (c) 2019 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+#include "mail-storage.h"
+#include "mail-namespace.h"
+
+#include "sieve-common.h"
+#include "sieve-actions.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "ext-special-use-common.h"
+
+/*
+ * specialuse_exists command
+ *
+ * Syntax:
+ *    specialuse_exists [<mailbox: string>]
+ *                      <special-use-flags: string-list>
+ */
+
+static bool
+tst_specialuse_exists_validate(struct sieve_validator *valdtr,
+			       struct sieve_command *tst);
+static bool
+tst_specialuse_exists_generate(const struct sieve_codegen_env *cgenv,
+			       struct sieve_command *ctx);
+
+const struct sieve_command_def specialuse_exists_test = {
+	.identifier = "specialuse_exists",
+	.type = SCT_TEST,
+	.positional_args = -1, /* We check positional arguments ourselves */
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = tst_specialuse_exists_validate,
+	.generate = tst_specialuse_exists_generate,
+};
+
+/*
+ * Mailboxexists operation
+ */
+
+static bool
+tst_specialuse_exists_operation_dump(const struct sieve_dumptime_env *denv,
+				     sieve_size_t *address);
+static int
+tst_specialuse_exists_operation_execute(const struct sieve_runtime_env *renv,
+					sieve_size_t *address);
+
+const struct sieve_operation_def specialuse_exists_operation = {
+	.mnemonic = "SPECIALUSE_EXISTS",
+	.ext_def = &special_use_extension,
+	.dump = tst_specialuse_exists_operation_dump,
+	.execute = tst_specialuse_exists_operation_execute,
+};
+
+/*
+ * Test validation
+ */
+
+struct _validate_context {
+	struct sieve_validator *valdtr;
+	struct sieve_command *tst;
+};
+
+static int
+tst_specialuse_exists_flag_validate(void *context,
+				    struct sieve_ast_argument *arg)
+{
+	struct _validate_context *valctx = (struct _validate_context *)context;
+
+	if (sieve_argument_is_string_literal(arg)) {
+		const char *flag = sieve_ast_argument_strc(arg);
+
+		if (!ext_special_use_flag_valid(flag)) {
+			sieve_argument_validate_error(
+				valctx->valdtr, arg, "%s test: "
+				"invalid special-use flag `%s' specified",
+				sieve_command_identifier(valctx->tst),
+				str_sanitize(flag, 64));
+		}
+	}
+
+	return 1;
+}
+
+static bool
+tst_specialuse_exists_validate(struct sieve_validator *valdtr,
+			       struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+	struct sieve_ast_argument *arg2;
+	struct sieve_ast_argument *aarg;
+	struct _validate_context valctx;
+
+	if (arg == NULL) {
+		sieve_command_validate_error(
+			valdtr, tst, "the %s %s expects at least one argument, "
+			"but none was found",
+			sieve_command_identifier(tst),
+			sieve_command_type_name(tst));
+		return FALSE;
+	}
+
+	if (sieve_ast_argument_type(arg) != SAAT_STRING &&
+	    sieve_ast_argument_type(arg) != SAAT_STRING_LIST) {
+		sieve_argument_validate_error(
+			valdtr, arg,
+			"the %s %s expects either a string (mailbox) or "
+			"a string-list (special-use flags) as first argument, "
+			"but %s was found",
+			sieve_command_identifier(tst),
+			sieve_command_type_name(tst),
+			sieve_ast_argument_name(arg));
+		return FALSE;
+	}
+
+	arg2 = sieve_ast_argument_next(arg);
+	if (arg2 != NULL) {
+		/* First, check syntax sanity */
+		if (sieve_ast_argument_type(arg) != SAAT_STRING) {
+			sieve_argument_validate_error(
+				valdtr, arg,
+				"if a second argument is specified for the %s %s, "
+				"the first must be a string (mailbox), "
+				"but %s was found",
+				sieve_command_identifier(tst),
+				sieve_command_type_name(tst),
+				sieve_ast_argument_name(arg));
+			return FALSE;
+		}
+		if (!sieve_validator_argument_activate(valdtr, tst, arg, FALSE))
+			return FALSE;
+
+		/* Check name validity when mailbox argument is not a variable */
+		if (sieve_argument_is_string_literal(arg)) {
+			const char *mailbox = sieve_ast_argument_strc(arg);
+			const char *error;
+
+			if (!sieve_mailbox_check_name(mailbox, &error)) {
+				sieve_argument_validate_warning(
+					valdtr, arg, "%s test: "
+					"invalid mailbox name `%s' specified: %s",
+					sieve_command_identifier(tst),
+					str_sanitize(mailbox, 256), error);
+			}
+		}
+
+		if (sieve_ast_argument_type(arg2) != SAAT_STRING &&
+		    sieve_ast_argument_type(arg2) != SAAT_STRING_LIST) {
+			sieve_argument_validate_error(
+				valdtr, arg2,
+				"the %s %s expects a string list (special-use flags) as "
+				"second argument when two arguments are specified, "
+				"but %s was found",
+				sieve_command_identifier(tst),
+				sieve_command_type_name(tst),
+				sieve_ast_argument_name(arg2));
+			return FALSE;
+		}
+	} else
+		arg2 = arg;
+
+	if (!sieve_validator_argument_activate(valdtr, tst, arg2, FALSE))
+		return FALSE;
+
+	aarg = arg2;
+	memset(&valctx, 0, sizeof(valctx));
+	valctx.valdtr = valdtr;
+	valctx.tst = tst;
+
+	return (sieve_ast_stringlist_map(
+		&aarg,	(void*)&valctx,
+		tst_specialuse_exists_flag_validate) >= 0);
+}
+
+/*
+ * Test generation
+ */
+
+static bool
+tst_specialuse_exists_generate(const struct sieve_codegen_env *cgenv,
+			       struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+	struct sieve_ast_argument *arg2;
+
+	sieve_operation_emit(cgenv->sblock,
+		tst->ext, &specialuse_exists_operation);
+
+	/* Generate arguments */
+	arg2 = sieve_ast_argument_next(arg);
+	if (arg2 != NULL) {
+		if (!sieve_generate_argument(cgenv, arg, tst))
+			return FALSE;
+	} else {
+		sieve_opr_omitted_emit(cgenv->sblock);
+		arg2 = arg;
+	}
+	return sieve_generate_argument(cgenv, arg2, tst);
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+tst_specialuse_exists_operation_dump(const struct sieve_dumptime_env *denv,
+				     sieve_size_t *address)
+{
+	struct sieve_operand oprnd;
+
+	sieve_code_dumpf(denv, "SPECIALUSE_EXISTS");
+	sieve_code_descend(denv);
+
+	sieve_code_mark(denv);
+	if (!sieve_operand_read(denv->sblock, address, NULL, &oprnd)) {
+		sieve_code_dumpf(denv, "ERROR: INVALID OPERAND");
+		return FALSE;
+	}
+
+	if (!sieve_operand_is_omitted(&oprnd)) {
+		return (sieve_opr_string_dump_data(denv, &oprnd,
+						   address, "mailbox") &&
+		        sieve_opr_stringlist_dump(denv, address,
+						  "special-use-flags"));
+	}
+
+	return sieve_opr_stringlist_dump(denv, address, "special-use-flags");
+}
+
+/*
+ * Code execution
+ */
+
+static int
+tst_specialuse_find_mailbox(const struct sieve_runtime_env *renv,
+			    const char *mailbox, struct mailbox **box_r)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	struct mail_user *user = eenv->scriptenv->user;
+	struct mailbox *box;
+	bool trace = sieve_runtime_trace_active(renv, SIEVE_TRLVL_MATCHING);
+	enum mail_error error_code;
+	const char *error;
+
+	*box_r = NULL;
+
+	if (user == NULL)
+		return 0;
+
+	/* Open the box */
+	box = mailbox_alloc_for_user(user, mailbox, MAILBOX_FLAG_POST_SESSION);
+	if (mailbox_open(box) < 0) {
+		error = mailbox_get_last_internal_error(box, &error_code);
+
+		if (trace) {
+			sieve_runtime_trace(
+				renv, 0, "mailbox `%s' cannot be opened: %s",
+				str_sanitize(mailbox, 256), error);
+		}
+
+		mailbox_free(&box);
+
+		if (error_code == MAIL_ERROR_TEMP) {
+			sieve_runtime_error(
+				renv, NULL,	"specialuse_exists test: "
+				"failed to open mailbox `%s': %s",
+				str_sanitize(mailbox, 256), error);
+			return -1;
+		}
+		return 0;
+	}
+
+	/* Also fail when it is readonly */
+	if (mailbox_is_readonly(box)) {
+		if (trace) {
+			sieve_runtime_trace(
+				renv, 0, "mailbox `%s' is read-only",
+				str_sanitize(mailbox, 256));
+		}
+
+		mailbox_free(&box);
+		return 0;
+	}
+
+	*box_r = box;
+	return 1;
+}
+
+static int
+tst_specialuse_find_specialuse(const struct sieve_runtime_env *renv,
+			       const char *special_use)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	struct mail_user *user = eenv->scriptenv->user;
+	struct mailbox *box;
+	bool trace = sieve_runtime_trace_active(renv, SIEVE_TRLVL_MATCHING);
+	enum mail_error error_code;
+	const char *error;
+
+	if (user == NULL)
+		return 0;
+
+	/* Open the box */
+	box = mailbox_alloc_for_user(user, special_use,
+				     (MAILBOX_FLAG_POST_SESSION |
+				      MAILBOX_FLAG_SPECIAL_USE));
+	if (mailbox_open(box) < 0) {
+		error = mailbox_get_last_internal_error(box, &error_code);
+
+		if (trace) {
+			sieve_runtime_trace(
+				renv, 0, "mailbox with special-use flag `%s' "
+				"cannot be opened: %s",
+				str_sanitize(special_use, 64), error);
+		}
+
+		mailbox_free(&box);
+
+		if (error_code == MAIL_ERROR_TEMP) {
+			sieve_runtime_error(
+				renv, NULL, "specialuse_exists test: "
+				"failed to open mailbox with special-use flag`%s': %s",
+				str_sanitize(special_use, 64), error);
+			return -1;
+		}
+		return 0;
+	}
+
+	/* Also fail when it is readonly */
+	if (mailbox_is_readonly(box)) {
+		if (trace) {
+			sieve_runtime_trace(
+				renv, 0,
+				"mailbox with special-use flag `%s' is read-only",
+				str_sanitize(special_use, 64));
+		}
+
+		mailbox_free(&box);
+		return 0;
+	}
+
+	mailbox_free(&box);
+	return 1;
+}
+
+static int
+tst_specialuse_exists_check_flag(const struct sieve_runtime_env *renv,
+				 struct mailbox *box, const char *use_flag,
+				 bool trace, bool *all_exist_r)
+{
+	int ret;
+
+	if (!ext_special_use_flag_valid(use_flag)) {
+		sieve_runtime_error(
+			renv, NULL, "specialuse_exists test: "
+			"invalid special-use flag `%s' specified",
+			str_sanitize(use_flag, 64));
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	if (box != NULL) {
+		/* Mailbox has this SPECIAL-USE flag? */
+		if (!mailbox_has_special_use(box, use_flag)) {
+			*all_exist_r = FALSE;
+			return SIEVE_EXEC_OK;
+		}
+	} else {
+		/* Is there mailbox with this SPECIAL-USE flag? */
+		ret = tst_specialuse_find_specialuse(renv, use_flag);
+		if (ret < 0)
+			return SIEVE_EXEC_TEMP_FAILURE;
+		if (ret == 0) {
+			*all_exist_r = FALSE;
+			return SIEVE_EXEC_OK;
+		}
+	}
+
+	if (trace) {
+		sieve_runtime_trace(
+			renv, 0, "special-use flag `%s' exists",
+			str_sanitize(use_flag, 80));
+	}
+
+	return SIEVE_EXEC_OK;
+}
+
+static int
+tst_specialuse_exists_operation_execute(const struct sieve_runtime_env *renv,
+					sieve_size_t *address)
+{
+	struct sieve_operand oprnd;
+	struct sieve_stringlist *special_use_flags;
+	string_t *mailbox, *special_use_flag;
+	struct mailbox *box = NULL;
+	const char *error;
+	bool trace = FALSE, all_exist = TRUE;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Read bare operand (two types possible) */
+	ret = sieve_operand_runtime_read(renv, address, NULL, &oprnd);
+	if (ret <= 0)
+		return ret;
+
+	/* Mailbox operand (optional) */
+	mailbox = NULL;
+	if (!sieve_operand_is_omitted(&oprnd)) {
+		/* Read the mailbox operand */
+		ret = sieve_opr_string_read_data(renv, &oprnd, address,
+						 "mailbox", &mailbox);
+		if (ret <= 0)
+			return ret;
+
+		/* Read flag list */
+		ret = sieve_opr_stringlist_read(renv, address,
+						"special-use-flags",
+						&special_use_flags);
+		if (ret <= 0)
+			return ret;
+
+	/* Flag-list operand */
+	} else {
+		/* Read flag list */
+		ret = sieve_opr_stringlist_read(renv, address,
+						"special-use-flags",
+						&special_use_flags);
+		if (ret <= 0)
+			return ret;
+	}
+
+	/*
+	 * Perform operation
+	 */
+
+	if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_TESTS)) {
+		sieve_runtime_trace(renv, 0, "specialuse_exists test");
+		sieve_runtime_trace_descend(renv);
+
+		trace = sieve_runtime_trace_active(renv, SIEVE_TRLVL_MATCHING);
+	}
+
+	if (mailbox != NULL) {
+		if (!sieve_mailbox_check_name(str_c(mailbox), &error)) {
+			sieve_runtime_warning(
+				renv, NULL, "specialuse_exists test: "
+				"invalid mailbox name `%s' specified: %s",
+				str_sanitize(str_c(mailbox), 256), error);
+			sieve_interpreter_set_test_result(renv->interp, FALSE);
+			return SIEVE_EXEC_OK;
+		}
+
+		if (tst_specialuse_find_mailbox(renv, str_c(mailbox), &box) < 0)
+			return SIEVE_EXEC_TEMP_FAILURE;
+	}
+
+	if (box == NULL && mailbox != NULL) {
+		sieve_runtime_trace(
+			renv, 0, "mailbox `%s' is not accessible",
+			str_sanitize(str_c(mailbox), 80));
+		sieve_interpreter_set_test_result(renv->interp, FALSE);
+		return SIEVE_EXEC_OK;
+	}
+
+	if (mailbox != NULL) {
+		sieve_runtime_trace(
+			renv, 0, "mailbox `%s' is accessible",
+			str_sanitize(str_c(mailbox), 80));
+	}
+
+	ret = 0;
+	special_use_flag = NULL;
+	while (all_exist &&
+	       (ret = sieve_stringlist_next_item(
+		special_use_flags, &special_use_flag)) > 0) {
+		const char *use_flag = str_c(special_use_flag);
+
+		ret = tst_specialuse_exists_check_flag(
+			renv, box, use_flag, trace, &all_exist);
+		if (ret <= 0) {
+			if (box != NULL) {
+				/* Close mailbox */
+				mailbox_free(&box);
+			}
+			return ret;
+		}
+	}
+
+	if (box != NULL) {
+		/* Close mailbox */
+		mailbox_free(&box);
+	}
+
+	if (ret < 0) {
+		sieve_runtime_trace_error(
+			renv, "invalid special-use flag item");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	if (trace) {
+		if (all_exist) {
+			sieve_runtime_trace(
+				renv, 0, "all special-use flags are set");
+		} else {
+			sieve_runtime_trace(
+				renv, 0, "some special-use are not set");
+		}
+	}
+
+	sieve_interpreter_set_test_result(renv->interp, all_exist);
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/subaddress/Makefile.am b/pigeonhole/src/lib-sieve/plugins/subaddress/Makefile.am
new file mode 100644
index 0000000..2bab53f
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/subaddress/Makefile.am
@@ -0,0 +1,8 @@
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+
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+	ext-subaddress.c
diff --git a/pigeonhole/src/lib-sieve/plugins/subaddress/Makefile.in b/pigeonhole/src/lib-sieve/plugins/subaddress/Makefile.in
new file mode 100644
index 0000000..c5b6b7c
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/subaddress/Makefile.in
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diff --git a/pigeonhole/src/lib-sieve/plugins/subaddress/ext-subaddress.c b/pigeonhole/src/lib-sieve/plugins/subaddress/ext-subaddress.c
new file mode 100644
index 0000000..abaa7ae
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/subaddress/ext-subaddress.c
@@ -0,0 +1,191 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension subaddress
+ * --------------------
+ *
+ * Author: Stephan Bosch
+ * Specification: RFC 3598
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "sieve-common.h"
+
+#include "sieve-settings.h"
+#include "sieve-code.h"
+#include "sieve-address.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-address-parts.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+
+#include <string.h>
+
+/*
+ * Configuration
+ */
+
+#define SUBADDRESS_DEFAULT_DELIM "+"
+
+struct ext_subaddress_config {
+	char *delimiter;
+};
+
+/*
+ * Forward declarations
+ */
+
+const struct sieve_address_part_def user_address_part;
+const struct sieve_address_part_def detail_address_part;
+
+static struct sieve_operand_def subaddress_operand;
+
+/*
+ * Extension
+ */
+
+static bool ext_subaddress_load
+	(const struct sieve_extension *ext, void **context);
+static void ext_subaddress_unload
+	(const struct sieve_extension *ext);
+static bool ext_subaddress_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *validator);
+
+const struct sieve_extension_def subaddress_extension = {
+	.name = "subaddress",
+	.load = ext_subaddress_load,
+	.unload = ext_subaddress_unload,
+	.validator_load = ext_subaddress_validator_load,
+	SIEVE_EXT_DEFINE_OPERAND(subaddress_operand)
+};
+
+static bool ext_subaddress_load
+(const struct sieve_extension *ext, void **context)
+{
+	struct ext_subaddress_config *config;
+	const char *delim;
+
+	if ( *context != NULL ) {
+		ext_subaddress_unload(ext);
+	}
+
+	delim = sieve_setting_get(ext->svinst, "recipient_delimiter");
+
+	if ( delim == NULL )
+		delim = SUBADDRESS_DEFAULT_DELIM;
+
+	config = i_new(struct ext_subaddress_config, 1);
+	config->delimiter = i_strdup(delim);
+
+	*context = (void *) config;
+
+	return TRUE;
+}
+
+static void ext_subaddress_unload
+(const struct sieve_extension *ext)
+{
+	struct ext_subaddress_config *config =
+		(struct ext_subaddress_config *) ext->context;
+
+	i_free(config->delimiter);
+	i_free(config);
+}
+
+static bool ext_subaddress_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *validator)
+{
+	sieve_address_part_register(validator, ext, &user_address_part);
+	sieve_address_part_register(validator, ext, &detail_address_part);
+
+	return TRUE;
+}
+
+/*
+ * Address parts
+ */
+
+enum ext_subaddress_address_part {
+  SUBADDRESS_USER,
+  SUBADDRESS_DETAIL
+};
+
+/* Forward declarations */
+
+static const char *subaddress_user_extract_from
+	(const struct sieve_address_part *addrp, const struct smtp_address *address);
+static const char *subaddress_detail_extract_from
+	(const struct sieve_address_part *addrp, const struct smtp_address *address);
+
+/* Address part objects */
+
+const struct sieve_address_part_def user_address_part = {
+	SIEVE_OBJECT("user",
+		&subaddress_operand, SUBADDRESS_USER),
+	subaddress_user_extract_from
+};
+
+const struct sieve_address_part_def detail_address_part = {
+	SIEVE_OBJECT("detail",
+		&subaddress_operand, SUBADDRESS_DETAIL),
+	.extract_from = subaddress_detail_extract_from
+};
+
+/* Address part implementation */
+
+static const char *subaddress_user_extract_from
+(const struct sieve_address_part *addrp, const struct smtp_address *address)
+{
+	struct ext_subaddress_config *config =
+		(struct ext_subaddress_config *) addrp->object.ext->context;
+	const char *delim;
+	size_t idx;
+
+	idx = strcspn(address->localpart, config->delimiter);
+	delim = address->localpart[idx] != '\0' ? address->localpart + idx : NULL;
+
+	if ( delim == NULL ) return address->localpart;
+
+	return t_strdup_until(address->localpart, delim);
+}
+
+static const char *subaddress_detail_extract_from
+(const struct sieve_address_part *addrp, const struct smtp_address *address)
+{
+	struct ext_subaddress_config *config =
+		(struct ext_subaddress_config *) addrp->object.ext->context;
+	const char *delim;
+	size_t idx;
+
+	idx = strcspn(address->localpart, config->delimiter);
+	delim = address->localpart[idx] != '\0' ? address->localpart + idx + 1: NULL;
+
+	/* Just to be sure */
+	if ( delim == NULL ||
+		delim > (address->localpart + strlen(address->localpart)) )
+		return NULL;
+	return delim;
+}
+
+/*
+ * Operand
+ */
+
+const struct sieve_address_part_def *ext_subaddress_parts[] = {
+	&user_address_part, &detail_address_part
+};
+
+static const struct sieve_extension_objects ext_address_parts =
+	SIEVE_EXT_DEFINE_ADDRESS_PARTS(ext_subaddress_parts);
+
+static struct sieve_operand_def subaddress_operand = {
+	.name = "address-part",
+	.ext_def = &subaddress_extension,
+	.class = &sieve_address_part_operand_class,
+	.interface = &ext_address_parts
+};
+
diff --git a/pigeonhole/src/lib-sieve/plugins/vacation/Makefile.am b/pigeonhole/src/lib-sieve/plugins/vacation/Makefile.am
new file mode 100644
index 0000000..09df27b
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vacation/Makefile.am
@@ -0,0 +1,19 @@
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+
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+	-I$(srcdir)/../.. \
+	-I$(srcdir)/../../util \
+	$(LIBDOVECOT_INCLUDE)
+
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+	cmd-vacation.c
+
+libsieve_ext_vacation_la_SOURCES = \
+	$(cmds) \
+	ext-vacation-common.c \
+	ext-vacation.c \
+	ext-vacation-seconds.c
+
+noinst_HEADERS = \
+	ext-vacation-common.h
+
diff --git a/pigeonhole/src/lib-sieve/plugins/vacation/Makefile.in b/pigeonhole/src/lib-sieve/plugins/vacation/Makefile.in
new file mode 100644
index 0000000..f18806a
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vacation/Makefile.in
@@ -0,0 +1,700 @@
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+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/cmd-vacation.Plo
+	-rm -f ./$(DEPDIR)/ext-vacation-common.Plo
+	-rm -f ./$(DEPDIR)/ext-vacation-seconds.Plo
+	-rm -f ./$(DEPDIR)/ext-vacation.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/vacation/cmd-vacation.c b/pigeonhole/src/lib-sieve/plugins/vacation/cmd-vacation.c
new file mode 100644
index 0000000..ddc14be
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vacation/cmd-vacation.c
@@ -0,0 +1,1578 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "strfuncs.h"
+#include "md5.h"
+#include "hostpid.h"
+#include "str-sanitize.h"
+#include "ostream.h"
+#include "message-address.h"
+#include "message-date.h"
+#include "var-expand.h"
+#include "ioloop.h"
+#include "mail-storage.h"
+
+#include "rfc2822.h"
+
+#include "sieve-common.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-address.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-actions.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-result.h"
+#include "sieve-message.h"
+#include "sieve-smtp.h"
+
+#include "ext-vacation-common.h"
+
+#include <stdio.h>
+
+/*
+ * Forward declarations
+ */
+
+static const struct sieve_argument_def vacation_days_tag;
+static const struct sieve_argument_def vacation_subject_tag;
+static const struct sieve_argument_def vacation_from_tag;
+static const struct sieve_argument_def vacation_addresses_tag;
+static const struct sieve_argument_def vacation_mime_tag;
+static const struct sieve_argument_def vacation_handle_tag;
+
+/*
+ * Vacation command
+ *
+ * Syntax:
+ *    vacation [":days" number] [":subject" string]
+ *                 [":from" string] [":addresses" string-list]
+ *                 [":mime"] [":handle" string] <reason: string>
+ */
+
+static bool
+cmd_vacation_registered(struct sieve_validator *valdtr,
+			const struct sieve_extension *ext,
+			struct sieve_command_registration *cmd_reg);
+static bool
+cmd_vacation_pre_validate(struct sieve_validator *valdtr,
+			  struct sieve_command *cmd);
+static bool
+cmd_vacation_validate(struct sieve_validator *valdtr,
+		      struct sieve_command *cmd);
+static bool
+cmd_vacation_generate(const struct sieve_codegen_env *cgenv,
+		      struct sieve_command *cmd);
+
+const struct sieve_command_def vacation_command = {
+	.identifier = "vacation",
+	.type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = cmd_vacation_registered,
+	.pre_validate = cmd_vacation_pre_validate,
+	.validate = cmd_vacation_validate,
+	.generate = cmd_vacation_generate,
+};
+
+/*
+ * Vacation command tags
+ */
+
+/* Forward declarations */
+
+static bool
+cmd_vacation_validate_number_tag(struct sieve_validator *valdtr,
+				 struct sieve_ast_argument **arg,
+				 struct sieve_command *cmd);
+static bool
+cmd_vacation_validate_string_tag(struct sieve_validator *valdtr,
+				 struct sieve_ast_argument **arg,
+				 struct sieve_command *cmd);
+static bool
+cmd_vacation_validate_stringlist_tag(struct sieve_validator *valdtr,
+				     struct sieve_ast_argument **arg,
+				     struct sieve_command *cmd);
+static bool
+cmd_vacation_validate_mime_tag(struct sieve_validator *valdtr,
+			       struct sieve_ast_argument **arg,
+			       struct sieve_command *cmd);
+
+/* Argument objects */
+
+static const struct sieve_argument_def vacation_days_tag = {
+	.identifier = "days",
+	.validate = cmd_vacation_validate_number_tag
+};
+
+static const struct sieve_argument_def vacation_seconds_tag = {
+	.identifier = "seconds",
+	.validate = cmd_vacation_validate_number_tag
+};
+
+static const struct sieve_argument_def vacation_subject_tag = {
+	.identifier = "subject",
+	.validate = cmd_vacation_validate_string_tag
+};
+
+static const struct sieve_argument_def vacation_from_tag = {
+	.identifier = "from",
+	.validate = cmd_vacation_validate_string_tag
+};
+
+static const struct sieve_argument_def vacation_addresses_tag = {
+	.identifier = "addresses",
+	.validate = cmd_vacation_validate_stringlist_tag
+};
+
+static const struct sieve_argument_def vacation_mime_tag = {
+	.identifier = "mime",
+	.validate = cmd_vacation_validate_mime_tag
+};
+
+static const struct sieve_argument_def vacation_handle_tag = {
+	.identifier = "handle",
+	.validate = cmd_vacation_validate_string_tag
+};
+
+/* Codes for optional arguments */
+
+enum cmd_vacation_optional {
+	OPT_END,
+	OPT_SECONDS,
+	OPT_SUBJECT,
+	OPT_FROM,
+	OPT_ADDRESSES,
+	OPT_MIME
+};
+
+/*
+ * Vacation operation
+ */
+
+static bool
+ext_vacation_operation_dump(const struct sieve_dumptime_env *denv,
+			    sieve_size_t *address);
+static int
+ext_vacation_operation_execute(const struct sieve_runtime_env *renv,
+			       sieve_size_t *address);
+
+const struct sieve_operation_def vacation_operation = {
+	.mnemonic = "VACATION",
+	.ext_def = &vacation_extension,
+	.dump = ext_vacation_operation_dump,
+	.execute = ext_vacation_operation_execute
+};
+
+/*
+ * Vacation action
+ */
+
+/* Forward declarations */
+
+static int
+act_vacation_check_duplicate(const struct sieve_runtime_env *renv,
+			     const struct sieve_action *act,
+			     const struct sieve_action *act_other);
+int act_vacation_check_conflict(const struct sieve_runtime_env *renv,
+				const struct sieve_action *act,
+				const struct sieve_action *act_other);
+static void
+act_vacation_print(const struct sieve_action *action,
+		   const struct sieve_result_print_env *rpenv, bool *keep);
+static int
+act_vacation_commit(const struct sieve_action_exec_env *aenv, void *tr_context);
+
+/* Action object */
+
+const struct sieve_action_def act_vacation = {
+	.name = "vacation",
+	.flags = SIEVE_ACTFLAG_SENDS_RESPONSE,
+	.check_duplicate = act_vacation_check_duplicate,
+	.check_conflict = act_vacation_check_conflict,
+	.print = act_vacation_print,
+	.commit = act_vacation_commit
+};
+
+/* Action context information */
+
+struct act_vacation_context {
+	const char *reason;
+
+	sieve_number_t seconds;
+	const char *subject;
+	const char *handle;
+	bool mime;
+	const char *from;
+	const struct smtp_address *from_address;
+	const struct smtp_address *const *addresses;
+};
+
+/*
+ * Command validation context
+ */
+
+struct cmd_vacation_context_data {
+	string_t *from;
+	string_t *subject;
+
+	bool mime;
+
+	struct sieve_ast_argument *handle_arg;
+};
+
+/*
+ * Tag validation
+ */
+
+static bool
+cmd_vacation_validate_number_tag(struct sieve_validator *valdtr,
+				 struct sieve_ast_argument **arg,
+				 struct sieve_command *cmd)
+{
+	const struct sieve_extension *ext = sieve_argument_ext(*arg);
+	const struct ext_vacation_config *config =
+		(const struct ext_vacation_config *)ext->context;
+	struct sieve_ast_argument *tag = *arg;
+	sieve_number_t period, seconds;
+
+	/* Detach the tag itself */
+	*arg = sieve_ast_arguments_detach(*arg,1);
+
+	/* Check syntax:
+	 *   :days number
+	 */
+	if (!sieve_validate_tag_parameter(valdtr, cmd, tag, *arg, NULL, 0,
+					  SAAT_NUMBER, FALSE))
+		return FALSE;
+
+	period = sieve_ast_argument_number(*arg);
+	if (sieve_argument_is(tag, vacation_days_tag))
+		seconds = period * (24*60*60);
+	else if (sieve_argument_is(tag, vacation_seconds_tag))
+		seconds = period;
+	else
+		i_unreached();
+
+	/* Enforce :seconds >= min_period */
+	if (seconds < config->min_period) {
+		seconds = config->min_period;
+
+		sieve_argument_validate_warning(
+			valdtr, *arg,
+			"specified :%s value '%llu' is under the minimum",
+			sieve_argument_identifier(tag),
+			(unsigned long long)period);
+	/* Enforce :days <= max_period */
+	} else if (config->max_period > 0 && seconds > config->max_period) {
+		seconds = config->max_period;
+
+		sieve_argument_validate_warning(
+			valdtr, *arg,
+			"specified :%s value '%llu' is over the maximum",
+			sieve_argument_identifier(tag),
+			(unsigned long long)period);
+	}
+
+	sieve_ast_argument_number_set(*arg, seconds);
+
+	/* Skip parameter */
+	*arg = sieve_ast_argument_next(*arg);
+
+	return TRUE;
+}
+
+static bool
+cmd_vacation_validate_string_tag(struct sieve_validator *valdtr,
+				 struct sieve_ast_argument **arg,
+				 struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+	struct cmd_vacation_context_data *ctx_data =
+		(struct cmd_vacation_context_data *)cmd->data;
+
+	/* Detach the tag itself */
+	*arg = sieve_ast_arguments_detach(*arg,1);
+
+	/* Check syntax:
+	 *   :subject string
+	 *   :from string
+	 *   :handle string
+	 */
+	if (!sieve_validate_tag_parameter(valdtr, cmd, tag, *arg, NULL, 0,
+					  SAAT_STRING, FALSE))
+		return FALSE;
+
+	if (sieve_argument_is(tag, vacation_from_tag)) {
+		if (sieve_argument_is_string_literal(*arg)) {
+			string_t *address = sieve_ast_argument_str(*arg);
+			const char *error;
+	 		bool result;
+
+	 		T_BEGIN {
+				result = sieve_address_validate_str(address,
+								    &error);
+
+				if (!result) {
+					sieve_argument_validate_error(
+						valdtr, *arg,
+						"specified :from address '%s' is invalid for vacation action: %s",
+						str_sanitize(str_c(address), 128),
+						error);
+				}
+			} T_END;
+
+			if (!result)
+				return FALSE;
+		}
+
+		ctx_data->from = sieve_ast_argument_str(*arg);
+
+		/* Skip parameter */
+		*arg = sieve_ast_argument_next(*arg);
+	} else if (sieve_argument_is(tag, vacation_subject_tag)) {
+		ctx_data->subject = sieve_ast_argument_str(*arg);
+
+		/* Skip parameter */
+		*arg = sieve_ast_argument_next(*arg);
+	} else if (sieve_argument_is(tag, vacation_handle_tag)) {
+		ctx_data->handle_arg = *arg;
+
+		/* Detach optional argument (emitted as mandatory) */
+		*arg = sieve_ast_arguments_detach(*arg, 1);
+	}
+	return TRUE;
+}
+
+static bool
+cmd_vacation_validate_stringlist_tag(struct sieve_validator *valdtr,
+				     struct sieve_ast_argument **arg,
+				     struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+
+	/* Detach the tag itself */
+	*arg = sieve_ast_arguments_detach(*arg,1);
+
+	/* Check syntax:
+	 *   :addresses string-list
+	 */
+	if (!sieve_validate_tag_parameter(valdtr, cmd, tag, *arg, NULL, 0,
+					  SAAT_STRING_LIST, FALSE))
+		return FALSE;
+
+	/* Skip parameter */
+	*arg = sieve_ast_argument_next(*arg);
+
+	return TRUE;
+}
+
+static bool
+cmd_vacation_validate_mime_tag(struct sieve_validator *valdtr ATTR_UNUSED,
+			       struct sieve_ast_argument **arg,
+			       struct sieve_command *cmd)
+{
+	struct cmd_vacation_context_data *ctx_data =
+		(struct cmd_vacation_context_data *)cmd->data;
+
+	ctx_data->mime = TRUE;
+
+	/* Skip tag */
+	*arg = sieve_ast_argument_next(*arg);
+
+	return TRUE;
+}
+
+/*
+ * Command registration
+ */
+
+static bool
+cmd_vacation_registered(struct sieve_validator *valdtr,
+			const struct sieve_extension *ext,
+			struct sieve_command_registration *cmd_reg)
+{
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &vacation_days_tag, OPT_SECONDS);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &vacation_subject_tag, OPT_SUBJECT);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &vacation_from_tag, OPT_FROM);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &vacation_addresses_tag, OPT_ADDRESSES);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &vacation_mime_tag, OPT_MIME);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &vacation_handle_tag, 0);
+	return TRUE;
+}
+
+bool ext_vacation_register_seconds_tag(
+	struct sieve_validator *valdtr,
+	const struct sieve_extension *vacation_ext)
+{
+	sieve_validator_register_external_tag(
+		valdtr, vacation_command.identifier, vacation_ext,
+		&vacation_seconds_tag, OPT_SECONDS);
+
+	return TRUE;
+}
+
+/*
+ * Command validation
+ */
+
+static bool
+cmd_vacation_pre_validate(struct sieve_validator *valdtr ATTR_UNUSED,
+			  struct sieve_command *cmd)
+{
+	struct cmd_vacation_context_data *ctx_data;
+
+	/* Assign context */
+	ctx_data = p_new(sieve_command_pool(cmd),
+		struct cmd_vacation_context_data, 1);
+	cmd->data = ctx_data;
+
+	return TRUE;
+}
+
+static const char _handle_empty_subject[] = "<default-subject>";
+static const char _handle_empty_from[] = "<default-from>";
+static const char _handle_mime_enabled[] = "<MIME>";
+static const char _handle_mime_disabled[] = "<NO-MIME>";
+
+static bool
+cmd_vacation_validate(struct sieve_validator *valdtr,
+		      struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg = cmd->first_positional;
+	struct cmd_vacation_context_data *ctx_data =
+		(struct cmd_vacation_context_data *)cmd->data;
+
+	if (!sieve_validate_positional_argument(valdtr, cmd, arg, "reason", 1,
+						SAAT_STRING))
+		return FALSE;
+
+	if (!sieve_validator_argument_activate(valdtr, cmd, arg, FALSE))
+		return FALSE;
+
+	/* Construct handle if not set explicitly */
+	if (ctx_data->handle_arg == NULL) {
+		T_BEGIN {
+			string_t *handle;
+			string_t *reason = sieve_ast_argument_str(arg);
+			unsigned int size = str_len(reason);
+
+			/* Precalculate the size of it all */
+			size += (ctx_data->subject == NULL ?
+				 sizeof(_handle_empty_subject) - 1 :
+				 str_len(ctx_data->subject));
+			size += (ctx_data->from == NULL ?
+				 sizeof(_handle_empty_from) - 1 :
+				 str_len(ctx_data->from));
+			size += (ctx_data->mime ?
+				 sizeof(_handle_mime_enabled) - 1 :
+				 sizeof(_handle_mime_disabled) - 1);
+
+			/* Construct the string */
+			handle = t_str_new(size);
+			str_append_str(handle, reason);
+
+			if (ctx_data->subject != NULL)
+				str_append_str(handle, ctx_data->subject);
+			else
+				str_append(handle, _handle_empty_subject);
+
+			if (ctx_data->from != NULL)
+				str_append_str(handle, ctx_data->from);
+			else
+				str_append(handle, _handle_empty_from);
+
+			str_append(handle, (ctx_data->mime ?
+					    _handle_mime_enabled :
+					    _handle_mime_disabled));
+
+			/* Create positional handle argument */
+			ctx_data->handle_arg =
+				sieve_ast_argument_string_create(
+					cmd->ast_node, handle,
+					sieve_ast_node_line(cmd->ast_node));
+		} T_END;
+
+		if (!sieve_validator_argument_activate(
+			valdtr, cmd, ctx_data->handle_arg, TRUE))
+			return FALSE;
+	} else {
+		/* Attach explicit handle argument as positional */
+		(void)sieve_ast_argument_attach(cmd->ast_node,
+						ctx_data->handle_arg);
+	}
+
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool
+cmd_vacation_generate(const struct sieve_codegen_env *cgenv,
+		      struct sieve_command *cmd)
+{
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &vacation_operation);
+
+	/* Generate arguments */
+	if (!sieve_generate_arguments(cgenv, cmd, NULL))
+		return FALSE;
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+ext_vacation_operation_dump(const struct sieve_dumptime_env *denv,
+			    sieve_size_t *address)
+{
+	int opt_code = 0;
+
+	sieve_code_dumpf(denv, "VACATION");
+	sieve_code_descend(denv);
+
+	/* Dump optional operands */
+
+	for (;;) {
+		int opt;
+		bool opok = TRUE;
+
+		if ((opt = sieve_opr_optional_dump(denv, address,
+						   &opt_code)) < 0)
+			return FALSE;
+
+		if (opt == 0)
+			break;
+
+		switch (opt_code) {
+		case OPT_SECONDS:
+			opok = sieve_opr_number_dump(denv, address, "seconds");
+			break;
+		case OPT_SUBJECT:
+			opok = sieve_opr_string_dump(denv, address, "subject");
+			break;
+		case OPT_FROM:
+			opok = sieve_opr_string_dump(denv, address, "from");
+			break;
+		case OPT_ADDRESSES:
+			opok = sieve_opr_stringlist_dump(denv, address,
+							 "addresses");
+			break;
+		case OPT_MIME:
+			sieve_code_dumpf(denv, "mime");
+			break;
+		default:
+			return FALSE;
+		}
+
+		if (!opok)
+			return FALSE;
+	}
+
+	/* Dump reason and handle operands */
+	return (sieve_opr_string_dump(denv, address, "reason") &&
+		sieve_opr_string_dump(denv, address, "handle"));
+}
+
+/*
+ * Code execution
+ */
+
+static int
+ext_vacation_operation_execute(const struct sieve_runtime_env *renv,
+			       sieve_size_t *address)
+{
+	const struct sieve_extension *this_ext = renv->oprtn->ext;
+	const struct ext_vacation_config *config =
+		(const struct ext_vacation_config *)this_ext->context;
+	struct sieve_side_effects_list *slist = NULL;
+	struct act_vacation_context *act;
+	pool_t pool;
+	int opt_code = 0;
+	sieve_number_t seconds = config->default_period;
+	bool mime = FALSE;
+	struct sieve_stringlist *addresses = NULL;
+	string_t *reason, *subject = NULL, *from = NULL, *handle = NULL;
+	const struct smtp_address *from_address = NULL;
+	int ret;
+
+	/*
+	 * Read code
+	 */
+
+	/* Optional operands */
+
+	for (;;) {
+		int opt;
+
+		if ((opt = sieve_opr_optional_read(renv, address,
+						   &opt_code)) < 0)
+			return SIEVE_EXEC_BIN_CORRUPT;
+
+		if (opt == 0)
+			break;
+
+		switch (opt_code) {
+		case OPT_SECONDS:
+			ret = sieve_opr_number_read(renv, address, "seconds",
+						    &seconds);
+			break;
+		case OPT_SUBJECT:
+			ret = sieve_opr_string_read(renv, address, "subject",
+						    &subject);
+			break;
+		case OPT_FROM:
+			ret = sieve_opr_string_read(renv, address, "from",
+						    &from);
+			break;
+		case OPT_ADDRESSES:
+			ret = sieve_opr_stringlist_read(renv, address,
+							"addresses",
+							&addresses);
+			break;
+		case OPT_MIME:
+			mime = TRUE;
+			ret = SIEVE_EXEC_OK;
+			break;
+		default:
+			sieve_runtime_trace_error(
+				renv, "unknown optional operand");
+			ret = SIEVE_EXEC_BIN_CORRUPT;
+		}
+
+		if (ret <= 0)
+			return ret;
+	}
+
+	/* Fixed operands */
+
+	if ((ret  =sieve_opr_string_read(renv, address,
+					 "reason", &reason)) <= 0 ||
+	    (ret = sieve_opr_string_read(renv, address,
+					 "handle", &handle)) <= 0)
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	/* Trace */
+
+	if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_ACTIONS)) {
+		sieve_runtime_trace(renv, 0, "vacation action");
+		sieve_runtime_trace_descend(renv);
+		sieve_runtime_trace(renv, 0, "auto-reply with message `%s'",
+				    str_sanitize(str_c(reason), 80));
+	}
+
+	/* Parse :from address */
+	if (from != NULL) {
+		const char *error;
+
+		from_address = sieve_address_parse_str(from, &error);
+		if (from_address == NULL) {
+			sieve_runtime_error(
+				renv, NULL,
+				"specified :from address '%s' is invalid for vacation action: %s",
+				str_sanitize(str_c(from), 128), error);
+   		}
+	}
+
+	/* Add vacation action to the result */
+
+	pool = sieve_result_pool(renv->result);
+	act = p_new(pool, struct act_vacation_context, 1);
+	act->reason = p_strdup(pool, str_c(reason));
+	act->handle = p_strdup(pool, str_c(handle));
+	act->seconds = seconds;
+	act->mime = mime;
+	if (subject != NULL)
+		act->subject = p_strdup(pool, str_c(subject));
+	if (from != NULL) {
+		act->from = p_strdup(pool, str_c(from));
+		act->from_address = smtp_address_clone(pool, from_address);
+	}
+
+	/* Normalize all addresses */
+	if (addresses != NULL) {
+		ARRAY_TYPE(smtp_address_const) addrs;
+		string_t *raw_address;
+		int ret;
+
+		sieve_stringlist_reset(addresses);
+
+		p_array_init(&addrs, pool, 4);
+
+		raw_address = NULL;
+		while ((ret = sieve_stringlist_next_item(addresses,
+							 &raw_address)) > 0) {
+			const struct smtp_address *addr;
+			const char *error;
+
+			addr = sieve_address_parse_str(raw_address, &error);
+			if (addr != NULL) {
+				addr = smtp_address_clone(pool, addr);
+				array_append(&addrs, &addr, 1);
+			} else {
+				sieve_runtime_error(
+					renv, NULL,
+					"specified :addresses item '%s' is invalid: "
+					"%s for vacation action (ignored)",
+					str_sanitize(str_c(raw_address),128),
+					error);
+			}
+		}
+
+		if (ret < 0) {
+			sieve_runtime_trace_error(
+				renv, "invalid addresses stringlist");
+			return SIEVE_EXEC_BIN_CORRUPT;
+		}
+
+		(void)array_append_space(&addrs);
+		act->addresses = array_idx(&addrs, 0);
+	}
+
+	if (sieve_result_add_action(renv, this_ext, "vacation", &act_vacation,
+				    slist, (void *)act, 0, FALSE) < 0)
+		return SIEVE_EXEC_FAILURE;
+
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Action
+ */
+
+/* Runtime verification */
+
+static int
+act_vacation_check_duplicate(const struct sieve_runtime_env *renv ATTR_UNUSED,
+			     const struct sieve_action *act,
+			     const struct sieve_action *act_other)
+{
+	if (!sieve_action_is_executed(act_other, renv->result)) {
+		sieve_runtime_error(
+			renv, act->location,
+			"duplicate vacation action not allowed "
+			"(previously triggered one was here: %s)",
+			act_other->location);
+		return -1;
+	}
+
+	/* Not an error if executed in preceeding script */
+	return 1;
+}
+
+int act_vacation_check_conflict(const struct sieve_runtime_env *renv,
+				const struct sieve_action *act,
+				const struct sieve_action *act_other)
+{
+	if ((act_other->def->flags & SIEVE_ACTFLAG_SENDS_RESPONSE) > 0) {
+		if (!sieve_action_is_executed(act_other, renv->result)) {
+			sieve_runtime_error(
+				renv, act->location,
+				"vacation action conflicts with other action: "
+				"the %s action (%s) also sends a response back to the sender",
+				act_other->def->name, act_other->location);
+			return -1;
+		} else {
+			/* Not an error if executed in preceeding script */
+			return 1;
+		}
+	}
+
+	return 0;
+}
+
+/* Result printing */
+
+static void act_vacation_print(const struct sieve_action *action ATTR_UNUSED,
+			       const struct sieve_result_print_env *rpenv,
+			       bool *keep ATTR_UNUSED)
+{
+	struct act_vacation_context *ctx =
+		(struct act_vacation_context *)action->context;
+
+	sieve_result_action_printf(rpenv, "send vacation message:");
+	sieve_result_printf(rpenv, "    => seconds : %llu\n",
+			    (unsigned long long)ctx->seconds);
+	if (ctx->subject != NULL) {
+		sieve_result_printf(rpenv, "    => subject : %s\n",
+				    ctx->subject);
+	}
+	if (ctx->from != NULL) {
+		sieve_result_printf(rpenv, "    => from    : %s\n",
+				    ctx->from);
+	}
+	if (ctx->handle != NULL) {
+		sieve_result_printf(rpenv, "    => handle  : %s\n",
+				    ctx->handle);
+	}
+	sieve_result_printf(rpenv, "\nSTART MESSAGE\n%s\nEND MESSAGE\n",
+			    ctx->reason);
+}
+
+/* Result execution */
+
+/* Headers known to be associated with mailing lists
+ */
+static const char * const _list_headers[] = {
+	"list-id",
+	"list-owner",
+	"list-subscribe",
+	"list-post",
+	"list-unsubscribe",
+	"list-help",
+	"list-archive",
+	NULL
+};
+
+/* Headers that should be searched for the user's own mail address(es)
+ */
+
+static const char * const _my_address_headers[] = {
+	"to",
+	"cc",
+	"bcc",
+	"resent-to",
+	"resent-cc",
+	"resent-bcc",
+	NULL
+};
+
+/* Headers that should be searched for the full sender address
+ */
+
+static const char * const _sender_headers[] = {
+	"sender",
+	"resent-from",
+	"from",
+	NULL
+};
+
+static inline bool _is_system_address(const struct smtp_address *address)
+{
+	if (strcasecmp(address->localpart, "MAILER-DAEMON") == 0)
+		return TRUE;
+	if (strcasecmp(address->localpart, "LISTSERV") == 0)
+		return TRUE;
+	if (strcasecmp(address->localpart, "majordomo") == 0)
+		return TRUE;
+	if (strstr(address->localpart, "-request") != NULL)
+		return TRUE;
+	if (str_begins(address->localpart, "owner-"))
+		return TRUE;
+	return FALSE;
+}
+
+static bool
+_msg_address_equals(const struct message_address *addr1,
+		    const struct smtp_address *addr2)
+{
+	struct smtp_address saddr;
+
+	i_assert(addr1->mailbox != NULL);
+	return (smtp_address_init_from_msg(&saddr, addr1) >= 0 &&
+		smtp_address_equals_icase(addr2, &saddr));
+}
+
+static inline bool
+_header_contains_my_address(const char *header_val,
+			    const struct smtp_address *my_address)
+{
+	const struct message_address *msg_addr;
+
+	msg_addr = message_address_parse(pool_datastack_create(),
+					 (const unsigned char *)header_val,
+					 strlen(header_val), 256, 0);
+	while (msg_addr != NULL) {
+		if (msg_addr->domain != NULL) {
+			if (_msg_address_equals(msg_addr, my_address))
+				return TRUE;
+		}
+
+		msg_addr = msg_addr->next;
+	}
+
+	return FALSE;
+}
+
+static inline bool
+_contains_my_address(const char * const *headers,
+		     const struct smtp_address *my_address)
+{
+	const char *const *hdsp = headers;
+
+	while (*hdsp != NULL) {
+		bool result;
+
+		T_BEGIN {
+			result = _header_contains_my_address(*hdsp, my_address);
+		} T_END;
+
+		if (result)
+			return TRUE;
+
+		hdsp++;
+	}
+
+	return FALSE;
+}
+
+static bool _contains_8bit(const char *text)
+{
+	const unsigned char *p = (const unsigned char *)text;
+
+	for (; *p != '\0'; p++) {
+		if ((*p & 0x80) != 0)
+			return TRUE;
+	}
+	return FALSE;
+}
+
+static bool
+_header_get_full_reply_recipient(const struct ext_vacation_config *config,
+				 const struct smtp_address *smtp_to,
+				 const char *header,
+				 struct message_address *reply_to_r)
+{
+	const struct message_address *addr;
+
+	addr = message_address_parse(
+		pool_datastack_create(),
+		(const unsigned char *)header,
+		strlen(header), 256, 0);
+
+	for (; addr != NULL; addr = addr->next) {
+		bool matched = config->to_header_ignore_envelope;
+
+		if (addr->domain == NULL || addr->invalid_syntax)
+			continue;
+
+		if (!matched)
+			matched = _msg_address_equals(addr, smtp_to);
+
+		if (matched) {
+			*reply_to_r = *addr;
+			return TRUE;
+		}
+	}
+	return FALSE;
+}
+
+static int
+_get_full_reply_recipient(const struct sieve_action_exec_env *aenv,
+			  const struct ext_vacation_config *config,
+			  const struct smtp_address *smtp_to,
+			  struct message_address *reply_to_r)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	const struct sieve_message_data *msgdata = eenv->msgdata;
+	const char *const *hdsp;
+	int ret;
+
+	hdsp = _sender_headers;
+	for (; *hdsp != NULL; hdsp++) {
+		const char *header;
+
+		if ((ret = mail_get_first_header(msgdata->mail, *hdsp,
+						 &header)) < 0) {
+			return sieve_result_mail_error(
+				aenv, msgdata->mail,
+				"failed to read header field `%s'", *hdsp);
+		}
+		if (ret == 0 || header == NULL)
+			continue;
+
+		if (_header_get_full_reply_recipient(config, smtp_to,
+						     header, reply_to_r))
+			return SIEVE_EXEC_OK;
+	}
+
+	reply_to_r->mailbox = smtp_to->localpart;
+	reply_to_r->domain = smtp_to->domain;
+	return SIEVE_EXEC_OK;
+}
+
+static const struct var_expand_table *
+_get_var_expand_table(const struct sieve_action_exec_env *aenv ATTR_UNUSED,
+		      const char *subject)
+{
+	const struct var_expand_table stack_tab[] = {
+		{ '$', subject, "subject" },
+		{ '\0', NULL, NULL }
+	};
+
+	return p_memdup(unsafe_data_stack_pool, stack_tab, sizeof(stack_tab));
+}
+
+static int
+act_vacation_get_default_subject(const struct sieve_action_exec_env *aenv,
+				 const struct ext_vacation_config *config,
+				 const char **subject_r)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	const struct sieve_message_data *msgdata = eenv->msgdata;
+	const char *header, *error;
+	string_t *str;
+	const struct var_expand_table *tab;
+	int ret;
+
+	*subject_r = (config->default_subject == NULL ?
+		      "Automated reply" : config->default_subject);
+	if ((ret = mail_get_first_header_utf8(msgdata->mail, "subject",
+					      &header)) < 0) {
+		return sieve_result_mail_error(
+			aenv, msgdata->mail,
+			"failed to read header field `subject'");
+	}
+	if (ret == 0)
+		return SIEVE_EXEC_OK;
+	if (config->default_subject_template == NULL) {
+		*subject_r = t_strconcat("Auto: ", header, NULL);
+		return SIEVE_EXEC_OK;
+	}
+
+	str = t_str_new(256);
+	tab = _get_var_expand_table(aenv, header);
+	if (var_expand(str, config->default_subject_template,
+		       tab, &error) <= 0) {
+		i_error("Failed to expand deliver_log_format=%s: %s",
+			config->default_subject_template, error);
+		*subject_r = t_strconcat("Auto: ", header, NULL);
+		return SIEVE_EXEC_OK;
+	}
+
+	*subject_r = str_c(str);
+	return SIEVE_EXEC_OK;
+}
+
+static int
+act_vacation_send(const struct sieve_action_exec_env *aenv,
+		  const struct ext_vacation_config *config,
+		  struct act_vacation_context *ctx,
+		  const struct smtp_address *smtp_to,
+		  const struct smtp_address *smtp_from,
+		  const struct message_address *reply_from)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	const struct sieve_message_data *msgdata = eenv->msgdata;
+	const struct sieve_script_env *senv = eenv->scriptenv;
+	struct sieve_smtp_context *sctx;
+	struct ostream *output;
+	string_t *msg;
+	struct message_address reply_to;
+	const char *header, *outmsgid, *subject, *error;
+	int ret;
+
+	/* Check smpt functions just to be sure */
+
+	if (!sieve_smtp_available(senv)) {
+		sieve_result_global_warning(
+			aenv, "vacation action has no means to send mail");
+		return SIEVE_EXEC_OK;
+	}
+
+	/* Make sure we have a subject for our reply */
+
+	if (ctx->subject == NULL || *(ctx->subject) == '\0') {
+		if ((ret = act_vacation_get_default_subject(aenv, config,
+							    &subject)) <= 0)
+			return ret;
+	} else {
+		subject = ctx->subject;
+	}
+
+	subject = str_sanitize_utf8(subject, config->max_subject_codepoints);
+
+	/* Obtain full To address for reply */
+
+	i_zero(&reply_to);
+	reply_to.mailbox = smtp_to->localpart;
+	reply_to.domain = smtp_to->domain;
+	if ((ret = _get_full_reply_recipient(aenv, config, smtp_to,
+					     &reply_to)) <= 0)
+		return ret;
+
+	/* Open smtp session */
+
+	sctx = sieve_smtp_start_single(senv, smtp_to, smtp_from, &output);
+
+	outmsgid = sieve_message_get_new_id(eenv->svinst);
+
+	/* Produce a proper reply */
+
+	msg = t_str_new(512);
+	rfc2822_header_write(msg, "X-Sieve", SIEVE_IMPLEMENTATION);
+	rfc2822_header_write(msg, "Message-ID", outmsgid);
+	rfc2822_header_write(msg, "Date", message_date_create(ioloop_time));
+
+	if (ctx->from != NULL && *(ctx->from) != '\0') {
+		rfc2822_header_write_address(msg, "From", ctx->from);
+	} else {
+		if (reply_from == NULL || reply_from->mailbox == NULL ||
+		    *reply_from->mailbox == '\0')
+			reply_from = sieve_get_postmaster(senv);
+		rfc2822_header_write(
+			msg, "From",
+			message_address_first_to_string(reply_from));
+	}
+
+	rfc2822_header_write(msg, "To",
+			     message_address_first_to_string(&reply_to));
+
+	if (_contains_8bit(subject))
+		rfc2822_header_utf8_printf(msg, "Subject", "%s", subject);
+	else
+		rfc2822_header_printf(msg, "Subject", "%s", subject);
+
+	/* Compose proper in-reply-to and references headers */
+
+	if ((ret = mail_get_first_header(msgdata->mail, "references",
+					 &header)) < 0) {
+		sieve_smtp_abort(sctx);
+		return sieve_result_mail_error(
+			aenv, msgdata->mail,
+			"failed to read header field `references'");
+	}
+
+	if (msgdata->id != NULL) {
+		rfc2822_header_write(msg, "In-Reply-To", msgdata->id);
+
+		if (ret > 0 && header != NULL) {
+			rfc2822_header_write(
+				msg, "References",
+				t_strconcat(header, " ", msgdata->id, NULL));
+		} else {
+			rfc2822_header_write(msg, "References", msgdata->id);
+		}
+	} else if (ret > 0 && header != NULL) {
+		rfc2822_header_write(msg, "References", header);
+	}
+
+	rfc2822_header_write(msg, "Auto-Submitted", "auto-replied (vacation)");
+	rfc2822_header_write(msg, "Precedence", "bulk");
+
+	/* Prevent older Microsoft products from replying to this message */
+	rfc2822_header_write(msg, "X-Auto-Response-Suppress", "All");
+
+	rfc2822_header_write(msg, "MIME-Version", "1.0");
+
+	if (!ctx->mime) {
+		rfc2822_header_write(msg, "Content-Type",
+				     "text/plain; charset=utf-8");
+		rfc2822_header_write(msg, "Content-Transfer-Encoding", "8bit");
+		str_append(msg, "\r\n");
+	}
+
+	str_printfa(msg, "%s\r\n", ctx->reason);
+	o_stream_nsend(output, str_data(msg), str_len(msg));
+
+	/* Close smtp session */
+	if ((ret = sieve_smtp_finish(sctx, &error)) <= 0) {
+		if (ret < 0) {
+			sieve_result_global_error(
+				aenv, "failed to send vacation response to %s: "
+				"<%s> (temporary error)",
+				smtp_address_encode(smtp_to),
+				str_sanitize(error, 512));
+		} else {
+			sieve_result_global_log_error(
+				aenv, "failed to send vacation response to %s: "
+				"<%s> (permanent error)",
+				smtp_address_encode(smtp_to),
+				str_sanitize(error, 512));
+		}
+		/* This error will be ignored in the end */
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	eenv->exec_status->significant_action_executed = TRUE;
+	return SIEVE_EXEC_OK;
+}
+
+static void
+act_vacation_hash(struct act_vacation_context *vctx, const char *sender,
+		  unsigned char hash_r[])
+{
+	const char *rpath = t_str_lcase(sender);
+	struct md5_context ctx;
+
+	md5_init(&ctx);
+	md5_update(&ctx, rpath, strlen(rpath));
+
+	md5_update(&ctx, vctx->handle, strlen(vctx->handle));
+
+	md5_final(&ctx, hash_r);
+}
+
+static int
+act_vacation_commit(const struct sieve_action_exec_env *aenv,
+		    void *tr_context ATTR_UNUSED)
+{
+	const struct sieve_action *action = aenv->action;
+	const struct sieve_extension *ext = action->ext;
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct sieve_instance *svinst = eenv->svinst;
+	const struct ext_vacation_config *config =
+		(const struct ext_vacation_config *)ext->context;
+	struct act_vacation_context *ctx =
+		(struct act_vacation_context *)action->context;
+	unsigned char dupl_hash[MD5_RESULTLEN];
+	struct mail *mail = sieve_message_get_mail(aenv->msgctx);
+	const struct smtp_address *sender, *recipient;
+	const struct smtp_address *orig_recipient, *user_email;
+	const struct smtp_address *smtp_from;
+	struct message_address reply_from;
+	const char *const *hdsp, *const *headers;
+	int ret;
+
+	if ((eenv->flags & SIEVE_EXECUTE_FLAG_SKIP_RESPONSES) != 0) {
+		sieve_result_global_log(
+			aenv, "not sending vacation reply (skipped)");
+		return SIEVE_EXEC_OK;
+	}
+
+	sender = sieve_message_get_sender(aenv->msgctx);
+	recipient = sieve_message_get_final_recipient(aenv->msgctx);
+
+	i_zero(&reply_from);
+	smtp_from = orig_recipient = user_email = NULL;
+
+	/* Is the recipient unset?
+	 */
+	if (smtp_address_isnull(recipient)) {
+		sieve_result_global_warning(
+			aenv, "vacation action aborted: "
+			"envelope recipient is <>");
+		return SIEVE_EXEC_OK;
+	}
+
+	/* Is the return path unset ?
+	 */
+	if (smtp_address_isnull(sender)) {
+		sieve_result_global_log(aenv, "discarded vacation reply to <>");
+		return SIEVE_EXEC_OK;
+	}
+
+	/* Are we perhaps trying to respond to ourselves ?
+	 */
+	if (smtp_address_equals_icase(sender, recipient)) {
+		sieve_result_global_log(
+			aenv, "discarded vacation reply to own address <%s>",
+			smtp_address_encode(sender));
+		return SIEVE_EXEC_OK;
+	}
+
+	/* Are we perhaps trying to respond to one of our alternative :addresses?
+	 */
+	if (ctx->addresses != NULL) {
+		const struct smtp_address * const *alt_address;
+
+		alt_address = ctx->addresses;
+		while (*alt_address != NULL) {
+			if (smtp_address_equals_icase(sender, *alt_address)) {
+				sieve_result_global_log(
+					aenv,
+					"discarded vacation reply to own address <%s> "
+					"(as specified using :addresses argument)",
+					smtp_address_encode(sender));
+				return SIEVE_EXEC_OK;
+			}
+			alt_address++;
+		}
+	}
+
+	/* Did whe respond to this user before? */
+	if (sieve_action_duplicate_check_available(aenv)) {
+		bool duplicate;
+
+		act_vacation_hash(ctx, smtp_address_encode(sender), dupl_hash);
+
+		ret = sieve_action_duplicate_check(aenv, dupl_hash,
+						   sizeof(dupl_hash),
+						   &duplicate);
+		if (ret < SIEVE_EXEC_OK) {
+			sieve_result_critical(
+				aenv, "failed to check for duplicate vacation response",
+				"failed to check for duplicate vacation response%s",
+				(ret == SIEVE_EXEC_TEMP_FAILURE ?
+				 " (temporaty failure)" : ""));
+			return ret;
+		}
+		if (duplicate) {
+			sieve_result_global_log(
+				aenv,
+				"discarded duplicate vacation response to <%s>",
+				smtp_address_encode(sender));
+			return SIEVE_EXEC_OK;
+		}
+	}
+
+	/* Are we trying to respond to a mailing list ? */
+	hdsp = _list_headers;
+	while (*hdsp != NULL) {
+		if ((ret = mail_get_headers(mail, *hdsp, &headers)) < 0) {
+			return sieve_result_mail_error(
+				aenv, mail,
+				"failed to read header field `%s'", *hdsp);
+		}
+
+		if (ret > 0 && headers[0] != NULL) {
+			/* Yes, bail out */
+			sieve_result_global_log(
+				aenv, "discarding vacation response "
+				"to mailinglist recipient <%s>",
+				smtp_address_encode(sender));
+			return SIEVE_EXEC_OK;
+		}
+		hdsp++;
+	}
+
+	/* Is the message that we are replying to an automatic reply ? */
+	if ((ret = mail_get_headers(mail, "auto-submitted", &headers)) < 0) {
+		return sieve_result_mail_error(
+			aenv, mail,
+			"failed to read header field `auto-submitted'");
+	}
+	/* Theoretically multiple headers could exist, so lets make sure */
+	if (ret > 0) {
+		hdsp = headers;
+		while (*hdsp != NULL) {
+			if (strcasecmp(*hdsp, "no") != 0) {
+				sieve_result_global_log(
+					aenv, "discarding vacation response "
+					"to auto-submitted message from <%s>",
+					smtp_address_encode(sender));
+					return SIEVE_EXEC_OK;
+			}
+			hdsp++;
+		}
+	}
+
+	/* Check for the (non-standard) precedence header */
+	if ((ret = mail_get_headers(mail, "precedence", &headers)) < 0) {
+		return sieve_result_mail_error(
+			aenv, mail, "failed to read header field `precedence'");
+	}
+	/* Theoretically multiple headers could exist, so lets make sure */
+	if (ret > 0) {
+		hdsp = headers;
+		while (*hdsp != NULL) {
+			if (strcasecmp(*hdsp, "junk") == 0 ||
+			    strcasecmp(*hdsp, "bulk") == 0 ||
+			    strcasecmp(*hdsp, "list") == 0) {
+				sieve_result_global_log(
+					aenv, "discarding vacation response "
+					"to precedence=%s message from <%s>",
+					*hdsp, smtp_address_encode(sender));
+					return SIEVE_EXEC_OK;
+			}
+			hdsp++;
+		}
+	}
+
+	/* Check for the (non-standard) Microsoft X-Auto-Response-Suppress header */
+	if ((ret = mail_get_headers(mail, "x-auto-response-suppress",
+				    &headers)) < 0) {
+		return sieve_result_mail_error(
+			aenv, mail,
+			"failed to read header field `x-auto-response-suppress'");
+	}
+	/* Theoretically multiple headers could exist, so lets make sure */
+	if (ret > 0) {
+		hdsp = headers;
+		while (*hdsp != NULL) {
+			const char *const *flags = t_strsplit(*hdsp, ",");
+
+			while (*flags != NULL) {
+				const char *flag = t_str_trim(*flags, " \t");
+
+				if (strcasecmp(flag, "All") == 0 ||
+				    strcasecmp(flag, "OOF") == 0) {
+					sieve_result_global_log(
+						aenv, "discarding vacation response to message from <%s> "
+						"(`%s' flag found in x-auto-response-suppress header)",
+						smtp_address_encode(sender), flag);
+					return SIEVE_EXEC_OK;
+				}
+				flags++;
+			}
+			hdsp++;
+		}
+	}
+
+	/* Do not reply to system addresses */
+	if (_is_system_address(sender)) {
+		sieve_result_global_log(
+			aenv, "not sending vacation response to system address <%s>",
+			smtp_address_encode(sender));
+		return SIEVE_EXEC_OK;
+	}
+
+	/* Fetch original recipient if necessary */
+	if (config->use_original_recipient)
+		orig_recipient = sieve_message_get_orig_recipient(aenv->msgctx);
+	/* Fetch explicitly configured user email address */
+	if (svinst->user_email != NULL)
+		user_email = svinst->user_email;
+
+	/* Is the original message directly addressed to the user or the addresses
+	 * specified using the :addresses tag?
+	 */
+	hdsp = _my_address_headers;
+	while (*hdsp != NULL) {
+		if ((ret = mail_get_headers(mail, *hdsp, &headers)) < 0) {
+			return sieve_result_mail_error(
+				aenv, mail, "failed to read header field `%s'",
+				*hdsp);
+		}
+		if (ret > 0 && headers[0] != NULL) {
+			/* Final recipient directly listed in headers? */
+			if (_contains_my_address(headers, recipient)) {
+				smtp_from = recipient;
+				message_address_init_from_smtp(
+					&reply_from, NULL, recipient);
+				break;
+			}
+
+			/* Original recipient directly listed in headers? */
+			if (!smtp_address_isnull(orig_recipient) &&
+			    _contains_my_address(headers, orig_recipient)) {
+				smtp_from = orig_recipient;
+				message_address_init_from_smtp(
+					&reply_from, NULL, orig_recipient);
+				break;
+			}
+
+			/* User-provided :addresses listed in headers? */
+			if (ctx->addresses != NULL) {
+				bool found = FALSE;
+				const struct smtp_address * const *my_address;
+
+				my_address = ctx->addresses;
+				while (!found && *my_address != NULL) {
+					if ((found = _contains_my_address(headers, *my_address))) {
+						/* Avoid letting user determine SMTP sender directly */
+						smtp_from = (orig_recipient == NULL ?
+							     recipient : orig_recipient);
+						message_address_init_from_smtp(
+							&reply_from, NULL, *my_address);
+					}
+					my_address++;
+				}
+
+				if (found) break;
+			}
+
+			/* Explicitly-configured user email address directly listed in
+			   headers? */
+			if (user_email != NULL &&
+			    _contains_my_address(headers, user_email)) {
+				smtp_from = user_email;
+				message_address_init_from_smtp(
+					&reply_from, NULL, smtp_from);
+				break;
+			}
+		}
+		hdsp++;
+	}
+
+	/* My address not found in the headers; we got an implicit delivery */
+	if (*hdsp == NULL) {
+		if (config->dont_check_recipient) {
+			/* Send reply from envelope recipient address */
+			smtp_from = (orig_recipient == NULL ?
+				     recipient : orig_recipient);
+			if (user_email == NULL)
+				user_email = sieve_get_user_email(svinst);
+			message_address_init_from_smtp(&reply_from,
+						       NULL, user_email);
+		} else {
+			const char *orig_rcpt_str = "", *user_email_str = "";
+
+			/* Bail out */
+			if (config->use_original_recipient) {
+				orig_rcpt_str =
+					t_strdup_printf("original-recipient=<%s>, ",
+							(orig_recipient == NULL ? "UNAVAILABLE" :
+							 smtp_address_encode(orig_recipient)));
+			}
+
+			if (user_email != NULL) {
+				user_email_str = t_strdup_printf(
+					"user-email=<%s>, ",
+					smtp_address_encode(user_email));
+			}
+
+			sieve_result_global_log(
+				aenv, "discarding vacation response for implicitly delivered message; "
+				"no known (envelope) recipient address found in message headers "
+				"(recipient=<%s>, %s%sand%s additional `:addresses' are specified)",
+				smtp_address_encode(recipient),
+				orig_rcpt_str, user_email_str,
+				(ctx->addresses == NULL || *ctx->addresses == NULL ?
+				 " no" : ""));
+			return SIEVE_EXEC_OK;
+		}
+	}
+
+	/* Send the message */
+
+	T_BEGIN {
+		ret = act_vacation_send(
+			aenv, config, ctx, sender,
+			(config->send_from_recipient ? smtp_from : NULL),
+			&reply_from);
+	} T_END;
+
+	if (ret == SIEVE_EXEC_OK) {
+		sieve_number_t seconds;
+
+		eenv->exec_status->significant_action_executed = TRUE;
+
+		struct event_passthrough *e =
+			sieve_action_create_finish_event(aenv);
+
+		sieve_result_event_log(aenv, e->event(),
+				       "sent vacation response to <%s>",
+				       smtp_address_encode(sender));
+
+		/* Check period limits once more */
+		seconds = ctx->seconds;
+		if (seconds < config->min_period)
+			seconds = config->min_period;
+		else if (config->max_period > 0 && seconds > config->max_period)
+			seconds = config->max_period;
+
+		/* Mark as replied */
+		if (seconds > 0) {
+			sieve_action_duplicate_mark(aenv, dupl_hash,
+						    sizeof(dupl_hash),
+						    ioloop_time + seconds);
+		}
+	}
+
+	if (ret == SIEVE_EXEC_TEMP_FAILURE)
+		return SIEVE_EXEC_TEMP_FAILURE;
+
+	/* Ignore all other errors */
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/vacation/ext-vacation-common.c b/pigeonhole/src/lib-sieve/plugins/vacation/ext-vacation-common.c
new file mode 100644
index 0000000..97be3a5
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vacation/ext-vacation-common.c
@@ -0,0 +1,114 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+#include "sieve-settings.h"
+#include "sieve-extensions.h"
+
+#include "ext-vacation-common.h"
+
+bool ext_vacation_load
+(const struct sieve_extension *ext, void **context)
+{
+	struct sieve_instance *svinst = ext->svinst;
+	struct ext_vacation_config *config;
+	sieve_number_t min_period, max_period, default_period;
+	bool use_original_recipient, dont_check_recipient, send_from_recipient,
+		to_header_ignore_envelope;
+	unsigned long long max_subject_codepoints;
+	const char *default_subject, *default_subject_template;
+
+	if ( *context != NULL ) {
+		ext_vacation_unload(ext);
+	}
+
+	if ( !sieve_setting_get_duration_value
+		(svinst, "sieve_vacation_min_period", &min_period) ) {
+		min_period = EXT_VACATION_DEFAULT_MIN_PERIOD;
+	}
+
+	if ( !sieve_setting_get_duration_value
+		(svinst, "sieve_vacation_max_period", &max_period) ) {
+		max_period = EXT_VACATION_DEFAULT_MAX_PERIOD;
+	}
+
+	if ( !sieve_setting_get_duration_value
+		(svinst, "sieve_vacation_default_period", &default_period) ) {
+		default_period = EXT_VACATION_DEFAULT_PERIOD;
+	}
+
+	if ( max_period > 0
+		&& (min_period > max_period || default_period < min_period
+			|| default_period > max_period) ) {
+		min_period = EXT_VACATION_DEFAULT_MIN_PERIOD;
+		max_period = EXT_VACATION_DEFAULT_MAX_PERIOD;
+		default_period = EXT_VACATION_DEFAULT_PERIOD;
+
+		e_warning(svinst->event, "vacation extension: "
+			  "invalid settings: violated "
+			  "sieve_vacation_min_period < "
+			  "sieve_vacation_default_period < "
+			  "sieve_vacation_max_period");
+	}
+
+	default_subject = sieve_setting_get(
+		svinst, "sieve_vacation_default_subject");
+	default_subject_template = sieve_setting_get(
+		svinst, "sieve_vacation_default_subject_template");
+
+	if ( !sieve_setting_get_uint_value
+		(svinst, "sieve_vacation_max_subject_codepoints", &max_subject_codepoints) ) {
+		max_subject_codepoints = EXT_VACATION_DEFAULT_MAX_SUBJECT_CODEPOINTS;
+	}
+
+	if ( !sieve_setting_get_bool_value
+		(svinst, "sieve_vacation_use_original_recipient", &use_original_recipient) ) {
+		use_original_recipient = FALSE;
+	}
+
+	if ( !sieve_setting_get_bool_value
+		(svinst, "sieve_vacation_dont_check_recipient", &dont_check_recipient) ) {
+		dont_check_recipient = FALSE;
+	}
+
+	if ( !sieve_setting_get_bool_value
+		(svinst, "sieve_vacation_send_from_recipient", &send_from_recipient) ) {
+		send_from_recipient = FALSE;
+	}
+
+	if ( !sieve_setting_get_bool_value(svinst,
+		"sieve_vacation_to_header_ignore_envelope",
+		&to_header_ignore_envelope) ) {
+		to_header_ignore_envelope = FALSE;
+	}
+
+	config = i_new(struct ext_vacation_config, 1);
+	config->min_period = min_period;
+	config->max_period = max_period;
+	config->default_period = default_period;
+	config->max_subject_codepoints = max_subject_codepoints;
+	config->default_subject = i_strdup_empty(default_subject);
+	config->default_subject_template = i_strdup_empty(default_subject_template);
+	config->use_original_recipient = use_original_recipient;
+	config->dont_check_recipient = dont_check_recipient;
+	config->send_from_recipient = send_from_recipient;
+	config->to_header_ignore_envelope = to_header_ignore_envelope;
+
+	*context = (void *) config;
+
+	return TRUE;
+}
+
+void ext_vacation_unload
+(const struct sieve_extension *ext)
+{
+	struct ext_vacation_config *config =
+		(struct ext_vacation_config *) ext->context;
+
+	i_free(config->default_subject);
+	i_free(config->default_subject_template);
+	i_free(config);
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/vacation/ext-vacation-common.h b/pigeonhole/src/lib-sieve/plugins/vacation/ext-vacation-common.h
new file mode 100644
index 0000000..3a38cf6
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vacation/ext-vacation-common.h
@@ -0,0 +1,60 @@
+#ifndef EXT_VACATION_COMMON_H
+#define EXT_VACATION_COMMON_H
+
+#include "sieve-common.h"
+
+/*
+ * Extension configuration
+ */
+
+#define EXT_VACATION_DEFAULT_PERIOD (7*24*60*60)
+#define EXT_VACATION_DEFAULT_MIN_PERIOD (24*60*60)
+#define EXT_VACATION_DEFAULT_MAX_PERIOD 0
+#define EXT_VACATION_DEFAULT_MAX_SUBJECT_CODEPOINTS 256
+
+struct ext_vacation_config {
+	unsigned int min_period;
+	unsigned int max_period;
+	unsigned int default_period;
+	unsigned long long max_subject_codepoints;
+	char *default_subject;
+	char *default_subject_template;
+	bool use_original_recipient;
+	bool dont_check_recipient;
+	bool send_from_recipient;
+	bool to_header_ignore_envelope;
+};
+
+/*
+ * Commands
+ */
+
+extern const struct sieve_command_def vacation_command;
+
+/*
+ * Operations
+ */
+
+extern const struct sieve_operation_def vacation_operation;
+
+/*
+ * Extensions
+ */
+
+/* Vacation */
+
+extern const struct sieve_extension_def vacation_extension;
+
+bool ext_vacation_load
+	(const struct sieve_extension *ext, void **context);
+void ext_vacation_unload
+	(const struct sieve_extension *ext);
+
+/* Vacation-seconds */
+
+extern const struct sieve_extension_def vacation_seconds_extension;
+
+bool ext_vacation_register_seconds_tag
+	(struct sieve_validator *valdtr, const struct sieve_extension *vacation_ext);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/vacation/ext-vacation-seconds.c b/pigeonhole/src/lib-sieve/plugins/vacation/ext-vacation-seconds.c
new file mode 100644
index 0000000..41c0f06
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vacation/ext-vacation-seconds.c
@@ -0,0 +1,66 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension vacation-seconds
+ * --------------------------
+ *
+ * Authors: Stephan Bosch <stephan@rename-it.nl>
+ * Specification: RFC 6131
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "lib.h"
+
+#include "sieve-common.h"
+
+#include "sieve-extensions.h"
+#include "sieve-validator.h"
+
+#include "ext-vacation-common.h"
+
+/*
+ * Extension
+ */
+
+bool ext_vacation_seconds_load
+	(const struct sieve_extension *ext, void **context);
+static bool ext_vacation_seconds_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+
+const struct sieve_extension_def vacation_seconds_extension = {
+	.name = "vacation-seconds",
+	.load = ext_vacation_seconds_load,
+	.validator_load = ext_vacation_seconds_validator_load,
+};
+
+bool ext_vacation_seconds_load
+(const struct sieve_extension *ext, void **context)
+{
+	if ( *context == NULL ) {
+		/* Make sure vacation extension is registered */
+		*context = (void *)
+			sieve_extension_require(ext->svinst, &vacation_extension, TRUE);
+	}
+
+	return TRUE;
+}
+
+static bool ext_vacation_seconds_validator_load
+(const struct sieve_extension *ext ATTR_UNUSED, struct sieve_validator *valdtr)
+{
+	const struct sieve_extension *vacation_ext;
+
+	/* Load vacation extension implicitly */
+
+	vacation_ext = sieve_validator_extension_load_implicit
+		(valdtr, vacation_extension.name);
+
+	if ( vacation_ext == NULL )
+		return FALSE;
+
+	/* Add seconds tag to vacation command */
+
+	return ext_vacation_register_seconds_tag(valdtr, vacation_ext);
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/vacation/ext-vacation.c b/pigeonhole/src/lib-sieve/plugins/vacation/ext-vacation.c
new file mode 100644
index 0000000..8d3d9a7
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vacation/ext-vacation.c
@@ -0,0 +1,131 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension vacation
+ * ------------------
+ *
+ * Authors: Stephan Bosch <stephan@rename-it.nl>
+ * Specification: RFC 5230
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "lib.h"
+
+#include "sieve-common.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "ext-vacation-common.h"
+
+/*
+ * Extension
+ */
+
+static bool
+ext_vacation_validator_load(const struct sieve_extension *ext,
+			   struct sieve_validator *valdtr);
+static bool
+ext_vacation_interpreter_load(const struct sieve_extension *ext,
+			      const struct sieve_runtime_env *renv,
+			      sieve_size_t *address);
+
+static bool
+ext_vacation_validator_validate(const struct sieve_extension *ext,
+				struct sieve_validator *valdtr, void *context,
+				struct sieve_ast_argument *require_arg,
+				bool required);
+static int
+ext_vacation_interpreter_run(const struct sieve_extension *this_ext,
+			     const struct sieve_runtime_env *renv,
+			     void *context, bool deferred);
+
+const struct sieve_extension_def vacation_extension = {
+	.name = "vacation",
+	.load = ext_vacation_load,
+	.unload = ext_vacation_unload,
+	.validator_load = ext_vacation_validator_load,
+	.interpreter_load = ext_vacation_interpreter_load,
+	SIEVE_EXT_DEFINE_OPERATION(vacation_operation)
+};
+const struct sieve_validator_extension
+vacation_validator_extension = {
+	.ext = &vacation_extension,
+	.validate = ext_vacation_validator_validate
+};
+const struct sieve_interpreter_extension
+vacation_interpreter_extension = {
+	.ext_def = &vacation_extension,
+	.run = ext_vacation_interpreter_run
+};
+
+static bool
+ext_vacation_validator_load(const struct sieve_extension *ext,
+			    struct sieve_validator *valdtr)
+{
+	/* Register new command */
+	sieve_validator_register_command(valdtr, ext, &vacation_command);
+
+	sieve_validator_extension_register(valdtr, ext,
+					   &vacation_validator_extension, NULL);
+	return TRUE;
+}
+
+static bool
+ext_vacation_interpreter_load(const struct sieve_extension *ext,
+			      const struct sieve_runtime_env *renv,
+			      sieve_size_t *address ATTR_UNUSED)
+{
+	sieve_interpreter_extension_register(
+		renv->interp, ext, &vacation_interpreter_extension, NULL);
+	return TRUE;
+}
+
+static bool
+ext_vacation_validator_validate(const struct sieve_extension *ext,
+				struct sieve_validator *valdtr,
+				void *context ATTR_UNUSED,
+				struct sieve_ast_argument *require_arg,
+				bool required)
+{
+	if (required) {
+		enum sieve_compile_flags flags =
+			sieve_validator_compile_flags(valdtr);
+
+		if ((flags & SIEVE_COMPILE_FLAG_NO_ENVELOPE) != 0) {
+			sieve_argument_validate_error(
+				valdtr, require_arg,
+				"the %s extension cannot be used in this context "
+				"(needs access to message envelope)",
+				sieve_extension_name(ext));
+			return FALSE;
+		}
+	}
+	return TRUE;
+}
+
+static int
+ext_vacation_interpreter_run(const struct sieve_extension *ext,
+			     const struct sieve_runtime_env *renv,
+			     void *context ATTR_UNUSED, bool deferred)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+
+	if ((eenv->flags & SIEVE_EXECUTE_FLAG_NO_ENVELOPE) != 0) {
+		if (!deferred) {
+			sieve_runtime_error(
+				renv, NULL,
+				"the %s extension cannot be used in this context "
+				"(needs access to message envelope)",
+				sieve_extension_name(ext));
+		}
+		return SIEVE_EXEC_FAILURE;
+	}
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/variables/Makefile.am b/pigeonhole/src/lib-sieve/plugins/variables/Makefile.am
new file mode 100644
index 0000000..354bad2
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/Makefile.am
@@ -0,0 +1,41 @@
+noinst_LTLIBRARIES = libsieve_ext_variables.la
+
+AM_CPPFLAGS = \
+	-I$(srcdir)/../.. \
+	$(LIBDOVECOT_INCLUDE)
+
+cmds = \
+	cmd-set.c
+
+tsts = \
+	tst-string.c
+
+libsieve_ext_variables_la_SOURCES = \
+	ext-variables-common.c \
+	ext-variables-name.c \
+	ext-variables-namespaces.c \
+	ext-variables-arguments.c \
+	ext-variables-operands.c \
+	ext-variables-modifiers.c \
+	ext-variables-dump.c \
+	$(cmds) \
+	$(tsts) \
+	ext-variables.c
+
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+	sieve-ext-variables.h
+
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+	ext-variables-limits.h \
+	ext-variables-name.h \
+	ext-variables-namespaces.h \
+	ext-variables-arguments.h \
+	ext-variables-operands.h \
+	ext-variables-modifiers.h \
+	ext-variables-dump.h
+
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diff --git a/pigeonhole/src/lib-sieve/plugins/variables/Makefile.in b/pigeonhole/src/lib-sieve/plugins/variables/Makefile.in
new file mode 100644
index 0000000..701d574
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/Makefile.in
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+	  if test -f "$$i"; then \
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+	-rm -f ./$(DEPDIR)/ext-variables-dump.Plo
+	-rm -f ./$(DEPDIR)/ext-variables-modifiers.Plo
+	-rm -f ./$(DEPDIR)/ext-variables-name.Plo
+	-rm -f ./$(DEPDIR)/ext-variables-namespaces.Plo
+	-rm -f ./$(DEPDIR)/ext-variables-operands.Plo
+	-rm -f ./$(DEPDIR)/ext-variables.Plo
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+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/variables/cmd-set.c b/pigeonhole/src/lib-sieve/plugins/variables/cmd-set.c
new file mode 100644
index 0000000..d0fdc97
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/cmd-set.c
@@ -0,0 +1,235 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "array.h"
+
+#include "sieve-common.h"
+#include "sieve-extensions.h"
+
+#include "sieve-code.h"
+#include "sieve-ast.h"
+#include "sieve-commands.h"
+#include "sieve-binary.h"
+
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "ext-variables-common.h"
+
+/*
+ * Set command
+ *
+ * Syntax:
+ *    set [MODIFIER] <name: string> <value: string>
+ */
+
+static bool cmd_set_registered
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+static bool cmd_set_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool cmd_set_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx);
+
+const struct sieve_command_def cmd_set = {
+	.identifier = "set",
+	.type = SCT_COMMAND,
+	.positional_args = 2,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = cmd_set_registered,
+	.validate = cmd_set_validate,
+	.generate = cmd_set_generate,
+};
+
+/*
+ * Set operation
+ */
+
+static bool cmd_set_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int cmd_set_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def cmd_set_operation = {
+	.mnemonic = "SET",
+	.ext_def = &variables_extension,
+	.code = EXT_VARIABLES_OPERATION_SET,
+	.dump = cmd_set_operation_dump,
+	.execute = cmd_set_operation_execute
+};
+
+/*
+ * Compiler context
+ */
+
+struct cmd_set_context {
+	ARRAY_TYPE(sieve_variables_modifier) modifiers;
+};
+
+/* Command registration */
+
+static bool cmd_set_registered
+(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+	struct sieve_command_registration *cmd_reg)
+{
+	sieve_variables_modifiers_link_tag(valdtr, ext, cmd_reg);
+
+	return TRUE;
+}
+
+/*
+ * Command validation
+ */
+
+static bool cmd_set_validate(struct sieve_validator *valdtr,
+	struct sieve_command *cmd)
+{
+	const struct sieve_extension *this_ext = cmd->ext;
+	struct sieve_ast_argument *arg = cmd->first_positional;
+	pool_t pool = sieve_command_pool(cmd);
+	struct cmd_set_context *sctx;
+
+	/* Create command context */
+	sctx = p_new(pool, struct cmd_set_context, 1);
+	p_array_init(&sctx->modifiers, pool, 4);
+	cmd->data = (void *) sctx;
+
+	/* Validate modifiers */
+	if ( !sieve_variables_modifiers_validate
+		(valdtr, cmd, &sctx->modifiers) )
+		return FALSE;
+
+	/* Validate name argument */
+	if ( !sieve_validate_positional_argument
+		(valdtr, cmd, arg, "name", 1, SAAT_STRING) ) {
+		return FALSE;
+	}
+	if ( !sieve_variable_argument_activate
+		(this_ext, this_ext, valdtr, cmd, arg, TRUE) ) {
+		return FALSE;
+	}
+	arg = sieve_ast_argument_next(arg);
+
+	/* Validate value argument */
+	if ( !sieve_validate_positional_argument
+		(valdtr, cmd, arg, "value", 2, SAAT_STRING) ) {
+		return FALSE;
+	}
+	return sieve_validator_argument_activate
+		(valdtr, cmd, arg, FALSE);
+}
+
+/*
+ * Code generation
+ */
+
+static bool cmd_set_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	const struct sieve_extension *this_ext = cmd->ext;
+	struct sieve_binary_block *sblock = cgenv->sblock;
+	struct cmd_set_context *sctx = (struct cmd_set_context *) cmd->data;
+
+	sieve_operation_emit(sblock, this_ext, &cmd_set_operation);
+
+	/* Generate arguments */
+	if ( !sieve_generate_arguments(cgenv, cmd, NULL) )
+		return FALSE;
+
+	/* Generate modifiers */
+	if ( !sieve_variables_modifiers_generate
+		(cgenv, &sctx->modifiers) )
+		return FALSE;
+
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool cmd_set_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "SET");
+	sieve_code_descend(denv);
+
+	/* Print both variable name and string value */
+	if ( !sieve_opr_string_dump(denv, address, "variable") ||
+		!sieve_opr_string_dump(denv, address, "value") )
+		return FALSE;
+
+	return sieve_variables_modifiers_code_dump(denv, address);
+}
+
+/*
+ * Code execution
+ */
+
+static int cmd_set_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	const struct sieve_extension *this_ext = renv->oprtn->ext;
+	struct sieve_variable_storage *storage;
+	ARRAY_TYPE(sieve_variables_modifier) modifiers;
+	unsigned int var_index;
+	string_t *value;
+	int ret = SIEVE_EXEC_OK;
+
+	/*
+	 * Read the normal operands
+	 */
+
+	if ( (ret=sieve_variable_operand_read
+		(renv, address, "variable", &storage, &var_index)) <= 0 )
+		return ret;
+
+	if ( (ret=sieve_opr_string_read(renv, address, "string", &value)) <= 0 )
+		return ret;
+
+	if ( (ret=sieve_variables_modifiers_code_read
+		(renv, this_ext, address, &modifiers)) <= 0 )
+		return ret;
+
+	/*
+	 * Determine and assign the value
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS, "set command");
+	sieve_runtime_trace_descend(renv);
+
+	/* Apply modifiers */
+	if ( (ret=sieve_variables_modifiers_apply
+		(renv, this_ext, &modifiers, &value)) <= 0 )
+		return ret;
+
+	/* Actually assign the value if all is well */
+	i_assert ( value != NULL );
+	if ( !sieve_variable_assign(storage, var_index, value) )
+		return SIEVE_EXEC_BIN_CORRUPT;
+
+	/* Trace */
+	if ( sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS) ) {
+		const char *var_name, *var_id;
+
+		(void)sieve_variable_get_identifier(storage, var_index, &var_name);
+		var_id = sieve_variable_get_varid(storage, var_index);
+
+		sieve_runtime_trace_here(renv, 0, "assign `%s' [%s] = \"%s\"",
+			var_name, var_id, str_c(value));
+	}
+
+	return SIEVE_EXEC_OK;
+}
+
+
+
+
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-arguments.c b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-arguments.c
new file mode 100644
index 0000000..2ac773c
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-arguments.c
@@ -0,0 +1,420 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "array.h"
+
+#include "sieve-common.h"
+#include "sieve-ast.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-dump.h"
+
+#include "ext-variables-common.h"
+#include "ext-variables-limits.h"
+#include "ext-variables-name.h"
+#include "ext-variables-operands.h"
+#include "ext-variables-namespaces.h"
+#include "ext-variables-arguments.h"
+
+/*
+ * Variable argument implementation
+ */
+
+static bool arg_variable_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+		struct sieve_command *context);
+
+const struct sieve_argument_def variable_argument = {
+	.identifier = "@variable",
+	.generate = arg_variable_generate
+};
+
+static bool ext_variables_variable_argument_activate
+(const struct sieve_extension *var_ext,
+	const struct sieve_extension *this_ext,
+	struct sieve_validator *valdtr, struct sieve_ast_argument *arg,
+	const char *variable)
+{
+	struct sieve_ast *ast = arg->ast;
+	struct sieve_variable *var;
+
+	var = ext_variables_validator_declare_variable(this_ext, valdtr, variable);
+
+	if ( var == NULL ) {
+		sieve_argument_validate_error(valdtr, arg,
+			"(implicit) declaration of new variable '%s' exceeds the limit "
+			"(max variables: %u)", variable,
+			sieve_variables_get_max_scope_size(var_ext));
+		return FALSE;
+	}
+
+	arg->argument = sieve_argument_create(ast, &variable_argument, this_ext, 0);
+	arg->argument->data = (void *) var;
+	return TRUE;
+}
+
+static struct sieve_ast_argument *ext_variables_variable_argument_create
+(const struct sieve_extension *this_ext, struct sieve_validator *valdtr,
+	struct sieve_ast_argument *parent_arg, const char *variable)
+{
+	struct sieve_ast *ast = parent_arg->ast;
+	struct sieve_ast_argument *new_arg;
+
+	new_arg = sieve_ast_argument_create(ast, sieve_ast_argument_line(parent_arg));
+	new_arg->type = SAAT_STRING;
+
+	if ( !ext_variables_variable_argument_activate
+		(this_ext, this_ext, valdtr, new_arg, variable) )
+		return NULL;
+
+	return new_arg;
+}
+
+static bool arg_variable_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+	struct sieve_command *context ATTR_UNUSED)
+{
+	struct sieve_argument *argument = arg->argument;
+	struct sieve_variable *var = (struct sieve_variable *) argument->data;
+
+	sieve_variables_opr_variable_emit(cgenv->sblock, argument->ext, var);
+
+	return TRUE;
+}
+
+/*
+ * Match value argument implementation
+ */
+
+static bool arg_match_value_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+	struct sieve_command *context ATTR_UNUSED);
+
+const struct sieve_argument_def match_value_argument = {
+	.identifier = "@match_value",
+	.generate = arg_match_value_generate
+};
+
+static bool ext_variables_match_value_argument_activate
+(const struct sieve_extension *this_ext,
+	struct sieve_validator *valdtr, struct sieve_ast_argument *arg,
+	unsigned int index, bool assignment)
+{
+	struct sieve_ast *ast = arg->ast;
+
+	if ( assignment ) {
+		sieve_argument_validate_error(valdtr, arg,
+			"cannot assign to match variable");
+		return FALSE;
+	}
+
+	if ( index > EXT_VARIABLES_MAX_MATCH_INDEX ) {
+		sieve_argument_validate_error(valdtr, arg,
+			"match value index %u out of range (max: %u)", index,
+			EXT_VARIABLES_MAX_MATCH_INDEX);
+		return FALSE;
+	}
+
+	arg->argument = sieve_argument_create
+		(ast, &match_value_argument, this_ext, 0);
+	arg->argument->data = (void *) POINTER_CAST(index);
+	return TRUE;
+}
+
+static struct sieve_ast_argument *ext_variables_match_value_argument_create
+(const struct sieve_extension *this_ext, struct sieve_validator *valdtr,
+	struct sieve_ast_argument *parent_arg, unsigned int index)
+{
+	struct sieve_ast *ast = parent_arg->ast;
+	struct sieve_ast_argument *new_arg;
+
+	new_arg = sieve_ast_argument_create(ast, sieve_ast_argument_line(parent_arg));
+	new_arg->type = SAAT_STRING;
+
+	if ( !ext_variables_match_value_argument_activate
+		(this_ext, valdtr, new_arg, index, FALSE) ) {
+		return NULL;
+  }
+
+	return new_arg;
+}
+
+static bool arg_match_value_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+	struct sieve_command *context ATTR_UNUSED)
+{
+	struct sieve_argument *argument = arg->argument;
+	unsigned int index = POINTER_CAST_TO(argument->data, unsigned int);
+
+	sieve_variables_opr_match_value_emit(cgenv->sblock, argument->ext, index);
+
+	return TRUE;
+}
+
+/*
+ * Variable string argument implementation
+ */
+
+static bool arg_variable_string_validate
+	(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *cmd);
+
+const struct sieve_argument_def variable_string_argument = {
+	.identifier = "@variable-string",
+	.validate = arg_variable_string_validate,
+	.generate = sieve_arg_catenated_string_generate,
+};
+
+static bool arg_variable_string_validate
+(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+	struct sieve_command *cmd)
+{
+	const struct sieve_extension *this_ext = (*arg)->argument->ext;
+	enum { ST_NONE, ST_OPEN, ST_VARIABLE, ST_CLOSE } state = ST_NONE;
+	pool_t pool = sieve_ast_pool((*arg)->ast);
+	struct sieve_arg_catenated_string *catstr = NULL;
+	string_t *str = sieve_ast_argument_str(*arg);
+	const char *p, *strstart, *substart = NULL;
+	const char *strval = (const char *) str_data(str);
+	const char *strend = strval + str_len(str);
+	bool result = TRUE;
+	ARRAY_TYPE(sieve_variable_name) substitution;
+	int nelements = 0;
+
+	T_BEGIN {
+		/* Initialize substitution structure */
+		t_array_init(&substitution, 2);
+
+		p = strval;
+		strstart = p;
+		while ( result && p < strend ) {
+			switch ( state ) {
+
+			/* Nothing found yet */
+			case ST_NONE:
+				if ( *p == '$' ) {
+					substart = p;
+					state = ST_OPEN;
+				}
+				p++;
+				break;
+
+			/* Got '$' */
+			case ST_OPEN:
+				if ( *p == '{' ) {
+					state = ST_VARIABLE;
+					p++;
+				} else
+					state = ST_NONE;
+				break;
+
+			/* Got '${' */
+			case ST_VARIABLE:
+				nelements = ext_variable_name_parse(&substitution, &p, strend);
+
+				if ( nelements < 0 )
+					state = ST_NONE;
+				else
+					state = ST_CLOSE;
+
+				break;
+
+			/* Finished parsing name, expecting '}' */
+			case ST_CLOSE:
+				if ( *p == '}' ) {
+					struct sieve_ast_argument *strarg;
+
+					/* We now know that the substitution is valid */
+
+					if ( catstr == NULL ) {
+						catstr = sieve_arg_catenated_string_create(*arg);
+					}
+
+					/* Add the substring that is before the substitution to the
+					 * variable-string AST.
+					 *
+					 * FIXME: For efficiency, if the variable is not found we should
+					 * coalesce this substring with the one after the substitution.
+					 */
+					if ( substart > strstart ) {
+						string_t *newstr = str_new(pool, substart - strstart);
+						str_append_data(newstr, strstart, substart - strstart);
+
+						strarg = sieve_ast_argument_string_create_raw
+							((*arg)->ast, newstr, (*arg)->source_line);
+						sieve_arg_catenated_string_add_element(catstr, strarg);
+
+						/* Give other substitution extensions a chance to do their work */
+						if ( !sieve_validator_argument_activate_super
+							(valdtr, cmd, strarg, FALSE) ) {
+							result = FALSE;
+							break;
+						}
+					}
+
+					/* Find the variable */
+					if ( nelements == 1 ) {
+						const struct sieve_variable_name *cur_element =
+							array_idx(&substitution, 0);
+
+						if ( cur_element->num_variable == -1 ) {
+							/* Add variable argument '${identifier}' */
+
+							strarg = ext_variables_variable_argument_create
+								(this_ext, valdtr, *arg, str_c(cur_element->identifier));
+
+						} else {
+							/* Add match value argument '${000}' */
+
+							strarg = ext_variables_match_value_argument_create
+								(this_ext, valdtr, *arg, cur_element->num_variable);
+						}
+					} else {
+						strarg = ext_variables_namespace_argument_create
+							(this_ext, valdtr, *arg, cmd, &substitution);
+					}
+
+					if ( strarg != NULL )
+						sieve_arg_catenated_string_add_element(catstr, strarg);
+
+					strstart = p + 1;
+					substart = strstart;
+
+					p++;
+				}
+
+				/* Finished, reset for the next substitution */
+				state = ST_NONE;
+			}
+		}
+	} T_END;
+
+	/* Bail out early if substitution is invalid */
+	if ( !result ) return FALSE;
+
+	/* Check whether any substitutions were found */
+	if ( catstr == NULL ) {
+		/* No substitutions in this string, pass it on to any other substution
+		 * extension.
+		 */
+		return sieve_validator_argument_activate_super(valdtr, cmd, *arg, TRUE);
+	}
+
+	/* Add the final substring that comes after the last substitution to the
+	 * variable-string AST.
+	 */
+	if ( strend > strstart ) {
+		struct sieve_ast_argument *strarg;
+		string_t *newstr = str_new(pool, strend - strstart);
+		str_append_data(newstr, strstart, strend - strstart);
+
+		strarg = sieve_ast_argument_string_create_raw
+			((*arg)->ast, newstr, (*arg)->source_line);
+		sieve_arg_catenated_string_add_element(catstr, strarg);
+
+		/* Give other substitution extensions a chance to do their work */
+		if ( !sieve_validator_argument_activate_super
+			(valdtr, cmd, strarg, FALSE) )
+			return FALSE;
+	}
+
+	return TRUE;
+}
+
+/*
+ * Variable argument interface
+ */
+
+static bool _sieve_variable_argument_activate
+(const struct sieve_extension *var_ext,
+	const struct sieve_extension *this_ext,
+	struct sieve_validator *valdtr, struct sieve_command *cmd,
+	struct sieve_ast_argument *arg, bool assignment)
+{
+	bool result = FALSE;
+	string_t *variable;
+	const char *varstr, *varend;
+	ARRAY_TYPE(sieve_variable_name) vname;
+	int nelements = 0;
+
+	T_BEGIN {
+		t_array_init(&vname, 2);
+
+		variable = sieve_ast_argument_str(arg);
+		varstr = str_c(variable);
+		varend = PTR_OFFSET(varstr, str_len(variable));
+		nelements = ext_variable_name_parse(&vname, &varstr, varend);
+
+		/* Check whether name parsing succeeded */
+		if ( nelements <= 0 || varstr != varend ) {
+			/* Parse failed */
+			sieve_argument_validate_error(valdtr, arg,
+				"invalid variable name '%s'", str_sanitize(str_c(variable),80));
+		} else if ( nelements == 1 ) {
+			/* Normal (match) variable */
+
+			const struct sieve_variable_name *cur_element =
+				array_idx(&vname, 0);
+
+			if ( cur_element->num_variable < 0 ) {
+				/* Variable */
+				result = ext_variables_variable_argument_activate(var_ext,
+					this_ext, valdtr, arg, str_c(cur_element->identifier));
+
+			} else {
+				/* Match value */
+				result = ext_variables_match_value_argument_activate
+					(this_ext, valdtr, arg, cur_element->num_variable, assignment);
+			}
+
+		} else {
+			/* Namespace variable */
+			result = ext_variables_namespace_argument_activate
+				(this_ext, valdtr, arg, cmd, &vname, assignment);
+		}
+	} T_END;
+
+	return result;
+}
+
+bool sieve_variable_argument_activate
+(const struct sieve_extension *var_ext,
+	const struct sieve_extension *this_ext,
+	struct sieve_validator *valdtr, struct sieve_command *cmd,
+	struct sieve_ast_argument *arg, bool assignment)
+{
+	if ( sieve_ast_argument_type(arg) == SAAT_STRING ) {
+		/* Single string */
+		return _sieve_variable_argument_activate(var_ext,
+			this_ext, valdtr, cmd, arg, assignment);
+
+	} else if ( sieve_ast_argument_type(arg) == SAAT_STRING_LIST ) {
+		/* String list */
+		struct sieve_ast_argument *stritem;
+
+		i_assert ( !assignment );
+
+		stritem = sieve_ast_strlist_first(arg);
+		while ( stritem != NULL ) {
+			if ( !_sieve_variable_argument_activate(var_ext,
+				this_ext, valdtr, cmd, stritem, assignment) )
+				return FALSE;
+
+			stritem = sieve_ast_strlist_next(stritem);
+		}
+
+		arg->argument = sieve_argument_create
+			(arg->ast, &string_list_argument, NULL, 0);
+
+		return TRUE;
+	}
+
+	return FALSE;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-arguments.h b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-arguments.h
new file mode 100644
index 0000000..87413c8
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-arguments.h
@@ -0,0 +1,24 @@
+#ifndef EXT_VARIABLES_ARGUMENTS_H
+#define EXT_VARIABLES_ARGUMENTS_H
+
+#include "sieve-common.h"
+
+/*
+ * Variable argument
+ */
+
+extern const struct sieve_argument_def variable_argument;
+
+/*
+ * Match value argument
+ */
+
+extern const struct sieve_argument_def match_value_argument;
+
+/*
+ * Variable string argument
+ */
+
+extern const struct sieve_argument_def variable_string_argument;
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-common.c b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-common.c
new file mode 100644
index 0000000..be9f677
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-common.c
@@ -0,0 +1,950 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "hash.h"
+#include "str.h"
+#include "array.h"
+
+#include "sieve-common.h"
+#include "sieve-settings.h"
+
+#include "sieve-ast.h"
+#include "sieve-binary.h"
+#include "sieve-code.h"
+#include "sieve-objects.h"
+#include "sieve-match-types.h"
+
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-dump.h"
+#include "sieve-interpreter.h"
+
+#include "ext-variables-common.h"
+#include "ext-variables-limits.h"
+#include "ext-variables-name.h"
+#include "ext-variables-modifiers.h"
+
+/*
+ * Limits
+ */
+
+unsigned int
+sieve_variables_get_max_scope_size(const struct sieve_extension *var_ext)
+{
+	const struct ext_variables_config *config =
+		ext_variables_get_config(var_ext);
+
+	return config->max_scope_size;
+}
+
+size_t
+sieve_variables_get_max_variable_size(const struct sieve_extension *var_ext)
+{
+	const struct ext_variables_config *config =
+		ext_variables_get_config(var_ext);
+
+	return config->max_variable_size;
+}
+
+/*
+ * Extension configuration
+ */
+
+bool
+ext_variables_load(const struct sieve_extension *ext, void **context)
+{
+	struct sieve_instance *svinst = ext->svinst;
+	struct ext_variables_config *config;
+	unsigned long long int uint_setting;
+	size_t size_setting;
+
+	if (*context != NULL)
+		ext_variables_unload(ext);
+
+	config = i_new(struct ext_variables_config, 1);
+
+	/* Get limits */
+	config->max_scope_size = EXT_VARIABLES_DEFAULT_MAX_SCOPE_SIZE;
+	config->max_variable_size = EXT_VARIABLES_DEFAULT_MAX_VARIABLE_SIZE;
+
+	if (sieve_setting_get_uint_value(
+		svinst, "sieve_variables_max_scope_size", &uint_setting)) {
+		if (uint_setting < EXT_VARIABLES_REQUIRED_MAX_SCOPE_SIZE) {
+			e_warning(svinst->event, "variables: "
+				  "setting sieve_variables_max_scope_size "
+				  "is lower than required by standards "
+				  "(>= %llu items)",
+				  (unsigned long long)EXT_VARIABLES_REQUIRED_MAX_SCOPE_SIZE);
+		} else {
+			config->max_scope_size = (unsigned int)uint_setting;
+		}
+	}
+
+	if (sieve_setting_get_size_value(
+		svinst, "sieve_variables_max_variable_size", &size_setting)) {
+		if (size_setting < EXT_VARIABLES_REQUIRED_MAX_VARIABLE_SIZE) {
+			e_warning(svinst->event, "variables: "
+				  "setting sieve_variables_max_variable_size "
+				  "is lower than required by standards "
+				  "(>= %zu bytes)",
+				  (size_t)EXT_VARIABLES_REQUIRED_MAX_VARIABLE_SIZE);
+		} else {
+			config->max_variable_size = size_setting;
+		}
+	}
+
+	*context = (void *)config;
+	return TRUE;
+}
+
+void ext_variables_unload(const struct sieve_extension *ext)
+{
+	struct ext_variables_config *config =
+		(struct ext_variables_config *)ext->context;
+
+	i_free(config);
+}
+
+const struct ext_variables_config *
+ext_variables_get_config(const struct sieve_extension *var_ext)
+{
+	const struct ext_variables_config *config =
+		(const struct ext_variables_config *)var_ext->context;
+
+	i_assert(var_ext->def == &variables_extension);
+	return config;
+}
+
+/*
+ * Variable scope
+ */
+
+struct sieve_variable_scope {
+	pool_t pool;
+	int refcount;
+
+	struct sieve_instance *svinst;
+	const struct sieve_extension *var_ext;
+	const struct sieve_extension *ext;
+
+	struct sieve_variable *error_var;
+
+	HASH_TABLE(const char *, struct sieve_variable *) variables;
+	ARRAY(struct sieve_variable *) variable_index;
+};
+
+struct sieve_variable_scope_binary {
+	struct sieve_variable_scope *scope;
+
+	unsigned int size;
+	struct sieve_binary_block *sblock;
+	sieve_size_t address;
+};
+
+struct sieve_variable_scope_iter {
+	struct sieve_variable_scope *scope;
+	struct hash_iterate_context *hctx;
+};
+
+struct sieve_variable_scope *
+sieve_variable_scope_create(struct sieve_instance *svinst,
+			    const struct sieve_extension *var_ext,
+			    const struct sieve_extension *ext)
+{
+	struct sieve_variable_scope *scope;
+	pool_t pool;
+
+	i_assert(var_ext->def == &variables_extension);
+
+	pool = pool_alloconly_create("sieve_variable_scope", 4096);
+	scope = p_new(pool, struct sieve_variable_scope, 1);
+	scope->pool = pool;
+	scope->refcount = 1;
+
+	scope->svinst = svinst;
+	scope->var_ext = var_ext;
+	scope->ext = ext;
+
+	hash_table_create(&scope->variables, pool, 0, strcase_hash, strcasecmp);
+	p_array_init(&scope->variable_index, pool, 128);
+
+	return scope;
+}
+
+void sieve_variable_scope_ref(struct sieve_variable_scope *scope)
+{
+	scope->refcount++;
+}
+
+void sieve_variable_scope_unref(struct sieve_variable_scope **_scope)
+{
+	struct sieve_variable_scope *scope = *_scope;
+
+	i_assert(scope->refcount > 0);
+
+	if (--scope->refcount != 0)
+		return;
+
+	hash_table_destroy(&scope->variables);
+
+	*_scope = NULL;
+	pool_unref(&scope->pool);
+}
+
+pool_t sieve_variable_scope_pool(struct sieve_variable_scope *scope)
+{
+	return scope->pool;
+}
+
+struct sieve_variable *
+sieve_variable_scope_declare(struct sieve_variable_scope *scope,
+			     const char *identifier)
+{
+	unsigned int max_scope_size;
+	struct sieve_variable *var;
+
+	var = hash_table_lookup(scope->variables, identifier);
+	if (var != NULL)
+		return var;
+
+	max_scope_size = sieve_variables_get_max_scope_size(scope->var_ext);
+	if (array_count(&scope->variable_index) >= max_scope_size) {
+		if (scope->error_var == NULL) {
+			var = p_new(scope->pool, struct sieve_variable, 1);
+			var->identifier = "@ERROR@";
+			var->index = 0;
+
+			scope->error_var = var;
+			return NULL;
+		}
+
+		return scope->error_var;
+	}
+
+	var = p_new(scope->pool, struct sieve_variable, 1);
+	var->ext = scope->ext;
+	var->identifier = p_strdup(scope->pool, identifier);
+	var->index = array_count(&scope->variable_index);
+
+	hash_table_insert(scope->variables, var->identifier, var);
+	array_append(&scope->variable_index, &var, 1);
+	return var;
+}
+
+struct sieve_variable *
+sieve_variable_scope_get_variable(struct sieve_variable_scope *scope,
+				  const char *identifier)
+{
+	return hash_table_lookup(scope->variables, identifier);
+}
+
+struct sieve_variable *
+sieve_variable_scope_import(struct sieve_variable_scope *scope,
+			    struct sieve_variable *var)
+{
+	struct sieve_variable *old_var, *new_var;
+
+	old_var = sieve_variable_scope_get_variable(scope, var->identifier);
+	if (old_var != NULL) {
+		i_assert(memcmp(old_var, var, sizeof(*var)) == 0);
+		return old_var;
+	}
+
+	new_var = p_new(scope->pool, struct sieve_variable, 1);
+	memcpy(new_var, var, sizeof(*new_var));
+
+	hash_table_insert(scope->variables, new_var->identifier, new_var);
+
+	/* Not entered into the index because it is an external variable
+	   (This can be done unlimited; only limited by the size of the external
+	   scope)
+	 */
+	return new_var;
+}
+
+struct sieve_variable_scope_iter *
+sieve_variable_scope_iterate_init(struct sieve_variable_scope *scope)
+{
+	struct sieve_variable_scope_iter *iter;
+
+	iter = t_new(struct sieve_variable_scope_iter, 1);
+	iter->scope = scope;
+	iter->hctx = hash_table_iterate_init(scope->variables);
+
+	return iter;
+}
+
+bool sieve_variable_scope_iterate(struct sieve_variable_scope_iter *iter,
+				  struct sieve_variable **var_r)
+{
+	const char *key;
+
+	return hash_table_iterate(iter->hctx, iter->scope->variables,
+				  &key, var_r);
+}
+
+void sieve_variable_scope_iterate_deinit(
+	struct sieve_variable_scope_iter **iter)
+{
+	hash_table_iterate_deinit(&(*iter)->hctx);
+	*iter = NULL;
+}
+
+unsigned int
+sieve_variable_scope_declarations(struct sieve_variable_scope *scope)
+{
+	return hash_table_count(scope->variables);
+}
+
+unsigned int sieve_variable_scope_size(struct sieve_variable_scope *scope)
+{
+	return array_count(&scope->variable_index);
+}
+
+struct sieve_variable * const *
+sieve_variable_scope_get_variables(struct sieve_variable_scope *scope,
+				   unsigned int *size_r)
+{
+	return array_get(&scope->variable_index, size_r);
+}
+
+struct sieve_variable *
+sieve_variable_scope_get_indexed(struct sieve_variable_scope *scope,
+				 unsigned int index)
+{
+	struct sieve_variable * const *var;
+
+	if (index >= array_count(&scope->variable_index))
+		return NULL;
+
+	var = array_idx(&scope->variable_index, index);
+	return *var;
+}
+
+/* Scope binary */
+
+struct sieve_variable_scope *
+sieve_variable_scope_binary_dump(struct sieve_instance *svinst,
+				 const struct sieve_extension *var_ext,
+				 const struct sieve_extension *ext,
+				 const struct sieve_dumptime_env *denv,
+				 sieve_size_t *address)
+{
+	struct sieve_variable_scope *local_scope;
+	unsigned int i, scope_size;
+	sieve_size_t pc;
+	sieve_offset_t end_offset;
+
+	/* Read scope size */
+	sieve_code_mark(denv);
+	if (!sieve_binary_read_unsigned(denv->sblock, address, &scope_size))
+		return NULL;
+
+	/* Read offset */
+	pc = *address;
+	if (!sieve_binary_read_offset(denv->sblock, address, &end_offset))
+		return NULL;
+
+	/* Create scope */
+	local_scope = sieve_variable_scope_create(svinst, var_ext, ext);
+
+	/* Read and dump scope itself */
+
+	sieve_code_dumpf(denv, "VARIABLES SCOPE [%u] (end: %08x)",
+			 scope_size, (unsigned int)(pc + end_offset));
+
+	for (i = 0; i < scope_size; i++) {
+		string_t *identifier;
+
+		sieve_code_mark(denv);
+		if (!sieve_binary_read_string(denv->sblock, address,
+					      &identifier))
+			return NULL;
+
+		sieve_code_dumpf(denv, "%3d: '%s'", i, str_c(identifier));
+
+		(void)sieve_variable_scope_declare(local_scope,
+						   str_c(identifier));
+	}
+
+	return local_scope;
+}
+
+struct sieve_variable_scope_binary *
+sieve_variable_scope_binary_create(struct sieve_variable_scope *scope)
+{
+	struct sieve_variable_scope_binary *scpbin;
+
+	scpbin = p_new(scope->pool, struct sieve_variable_scope_binary, 1);
+	scpbin->scope = scope;
+
+	return scpbin;
+}
+
+void sieve_variable_scope_binary_ref(struct sieve_variable_scope_binary *scpbin)
+{
+	sieve_variable_scope_ref(scpbin->scope);
+}
+
+void sieve_variable_scope_binary_unref(
+	struct sieve_variable_scope_binary **scpbin)
+{
+	sieve_variable_scope_unref(&(*scpbin)->scope);
+	*scpbin = NULL;
+}
+
+struct sieve_variable_scope_binary *
+sieve_variable_scope_binary_read(struct sieve_instance *svinst,
+				 const struct sieve_extension *var_ext,
+				 const struct sieve_extension *ext,
+				 struct sieve_binary_block *sblock,
+				 sieve_size_t *address)
+{
+	struct sieve_variable_scope *scope;
+	struct sieve_variable_scope_binary *scpbin;
+	unsigned int scope_size, max_scope_size;
+	const char *ext_name = (ext == NULL ? "variables" :
+				sieve_extension_name(ext));
+	sieve_size_t pc;
+	sieve_offset_t end_offset;
+
+	/* Read scope size */
+	if (!sieve_binary_read_unsigned(sblock, address, &scope_size)) {
+		e_error(svinst->event, "%s: "
+			"variable scope: failed to read size", ext_name);
+		return NULL;
+	}
+
+	/* Check size limit */
+	max_scope_size = sieve_variables_get_max_scope_size(var_ext);
+	if (scope_size > max_scope_size) {
+		e_error(svinst->event, "%s: "
+			"variable scope: size exceeds the limit (%u > %u)",
+			ext_name, scope_size, max_scope_size);
+		return NULL;
+	}
+
+	/* Read offset */
+	pc = *address;
+	if (!sieve_binary_read_offset(sblock, address, &end_offset)) {
+		e_error(svinst->event, "%s: "
+			"variable scope: failed to read end offset", ext_name);
+		return NULL;
+	}
+
+	/* Create scope */
+	scope = sieve_variable_scope_create(svinst, var_ext, ext);
+
+	scpbin = sieve_variable_scope_binary_create(scope);
+	scpbin->size = scope_size;
+	scpbin->sblock = sblock;
+	scpbin->address = *address;
+
+	*address = pc + end_offset;
+
+	return scpbin;
+}
+
+struct sieve_variable_scope *
+sieve_variable_scope_binary_get(struct sieve_variable_scope_binary *scpbin)
+{
+	const struct sieve_extension *ext = scpbin->scope->ext;
+	struct sieve_instance *svinst = scpbin->scope->svinst;
+	const char *ext_name = (ext == NULL ? "variables" :
+				sieve_extension_name(ext));
+	unsigned int i;
+
+	if (scpbin->sblock != NULL) {
+		sieve_size_t *address = &scpbin->address;
+
+		/* Read scope itself */
+		for (i = 0; i < scpbin->size; i++) {
+			struct sieve_variable *var;
+			string_t *identifier;
+
+			if (!sieve_binary_read_string(scpbin->sblock, address,
+						      &identifier)) {
+				e_error(svinst->event, "%s: variable scope: "
+					"failed to read variable name",
+					ext_name);
+				return NULL;
+			}
+
+			var = sieve_variable_scope_declare(scpbin->scope,
+							   str_c(identifier));
+
+			i_assert(var != NULL);
+			i_assert(var->index == i);
+		}
+
+		scpbin->sblock = NULL;
+	}
+
+	return scpbin->scope;
+}
+
+unsigned int
+sieve_variable_scope_binary_get_size(
+	struct sieve_variable_scope_binary *scpbin)
+{
+	if (scpbin->sblock != NULL)
+		return scpbin->size;
+
+	return array_count(&scpbin->scope->variable_index);
+}
+
+/*
+ * Variable storage
+ */
+
+struct sieve_variable_storage {
+	pool_t pool;
+	const struct sieve_extension *var_ext;
+	struct sieve_variable_scope *scope;
+	struct sieve_variable_scope_binary *scope_bin;
+	unsigned int max_size;
+	ARRAY(string_t *) var_values;
+};
+
+struct sieve_variable_storage *
+sieve_variable_storage_create(const struct sieve_extension *var_ext,
+			      pool_t pool,
+			      struct sieve_variable_scope_binary *scpbin)
+{
+	struct sieve_variable_storage *storage;
+
+	storage = p_new(pool, struct sieve_variable_storage, 1);
+	storage->pool = pool;
+	storage->var_ext = var_ext;
+	storage->scope_bin = scpbin;
+	storage->scope = NULL;
+
+	storage->max_size = sieve_variable_scope_binary_get_size(scpbin);
+
+	p_array_init(&storage->var_values, pool, 4);
+
+	return storage;
+}
+
+static inline bool
+sieve_variable_valid(struct sieve_variable_storage *storage,
+		     unsigned int index)
+{
+	if (storage->scope_bin == NULL)
+		return TRUE;
+
+	return (index < storage->max_size);
+}
+
+bool sieve_variable_get_identifier(struct sieve_variable_storage *storage,
+				   unsigned int index, const char **identifier)
+{
+	struct sieve_variable * const *var;
+
+	*identifier = NULL;
+
+	if (storage->scope_bin == NULL)
+		return TRUE;
+
+	if (storage->scope == NULL) {
+		storage->scope =
+			sieve_variable_scope_binary_get(storage->scope_bin);
+		if (storage->scope == NULL)
+			return FALSE;
+	}
+
+	/* FIXME: direct invasion of the scope object is a bit ugly */
+	if (index >= array_count(&storage->scope->variable_index))
+		return FALSE;
+
+	var = array_idx(&storage->scope->variable_index, index);
+	if (*var != NULL)
+		*identifier = (*var)->identifier;
+	return TRUE;
+}
+
+const char *
+sieve_variable_get_varid(struct sieve_variable_storage *storage,
+			 unsigned int index)
+{
+	if (storage->scope_bin == NULL)
+		return t_strdup_printf("%ld", (long)index);
+
+	if (storage->scope == NULL) {
+		storage->scope =
+			sieve_variable_scope_binary_get(storage->scope_bin);
+		if (storage->scope == NULL)
+			return NULL;
+	}
+
+	return sieve_ext_variables_get_varid(storage->scope->ext, index);
+}
+
+bool sieve_variable_get(struct sieve_variable_storage *storage,
+			unsigned int index, string_t **value)
+{
+	*value = NULL;
+
+	if (index < array_count(&storage->var_values)) {
+		string_t * const *varent;
+
+		varent = array_idx(&storage->var_values, index);
+
+		*value = *varent;
+	} else if (!sieve_variable_valid(storage, index)) {
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+bool sieve_variable_get_modifiable(struct sieve_variable_storage *storage,
+				   unsigned int index, string_t **value)
+{
+	string_t *dummy;
+
+	if (value == NULL)
+		value = &dummy;
+
+	if (!sieve_variable_get(storage, index, value))
+		return FALSE;
+
+	if (*value == NULL) {
+		*value = str_new(storage->pool, 256);
+		array_idx_set(&storage->var_values, index, value);
+	}
+	return TRUE;
+}
+
+bool sieve_variable_assign(struct sieve_variable_storage *storage,
+			   unsigned int index, const string_t *value)
+{
+	const struct ext_variables_config *config =
+		ext_variables_get_config(storage->var_ext);
+	string_t *varval;
+
+	if (!sieve_variable_get_modifiable(storage, index, &varval))
+		return FALSE;
+
+	str_truncate(varval, 0);
+	str_append_str(varval, value);
+
+	/* Just a precaution, caller should prevent this in the first place */
+	if (str_len(varval) > config->max_variable_size)
+		str_truncate_utf8(varval, config->max_variable_size);
+
+	return TRUE;
+}
+
+bool sieve_variable_assign_cstr(struct sieve_variable_storage *storage,
+				unsigned int index, const char *value)
+{
+	const struct ext_variables_config *config =
+		ext_variables_get_config(storage->var_ext);
+	string_t *varval;
+
+	if (!sieve_variable_get_modifiable(storage, index, &varval))
+		return FALSE;
+
+	str_truncate(varval, 0);
+	str_append(varval, value);
+
+	/* Just a precaution, caller should prevent this in the first place */
+	if (str_len(varval) > config->max_variable_size)
+		str_truncate_utf8(varval, config->max_variable_size);
+
+	return TRUE;
+}
+
+/*
+ * AST Context
+ */
+
+static void
+ext_variables_ast_free(const struct sieve_extension *ext ATTR_UNUSED,
+		       struct sieve_ast *ast ATTR_UNUSED, void *context)
+{
+	struct sieve_variable_scope *local_scope =
+		(struct sieve_variable_scope *)context;
+
+	/* Unreference main variable scope */
+	sieve_variable_scope_unref(&local_scope);
+}
+
+static const struct sieve_ast_extension variables_ast_extension = {
+    &variables_extension,
+    ext_variables_ast_free
+};
+
+static struct sieve_variable_scope *
+ext_variables_create_local_scope(const struct sieve_extension *this_ext,
+				 struct sieve_ast *ast)
+{
+	struct sieve_variable_scope *scope;
+
+	scope = sieve_variable_scope_create(this_ext->svinst, this_ext, NULL);
+
+	sieve_ast_extension_register(ast, this_ext, &variables_ast_extension,
+				     (void *)scope);
+	return scope;
+}
+
+static struct sieve_variable_scope *
+ext_variables_ast_get_local_scope(const struct sieve_extension *this_ext,
+				  struct sieve_ast *ast)
+{
+	struct sieve_variable_scope *local_scope =
+		(struct sieve_variable_scope *)
+			sieve_ast_extension_get_context(ast, this_ext);
+
+	return local_scope;
+}
+
+/*
+ * Validator context
+ */
+
+static struct ext_variables_validator_context *
+ext_variables_validator_context_create(const struct sieve_extension *this_ext,
+				       struct sieve_validator *valdtr)
+{
+	pool_t pool = sieve_validator_pool(valdtr);
+	struct ext_variables_validator_context *ctx;
+	struct sieve_ast *ast = sieve_validator_ast(valdtr);
+
+	ctx = p_new(pool, struct ext_variables_validator_context, 1);
+	ctx->modifiers = sieve_validator_object_registry_create(valdtr);
+	ctx->namespaces = sieve_validator_object_registry_create(valdtr);
+	ctx->local_scope = ext_variables_create_local_scope(this_ext, ast);
+
+	sieve_validator_extension_set_context(valdtr, this_ext, (void *)ctx);
+	return ctx;
+}
+
+struct ext_variables_validator_context *
+ext_variables_validator_context_get(const struct sieve_extension *this_ext,
+				    struct sieve_validator *valdtr)
+{
+	struct ext_variables_validator_context *ctx;
+
+	i_assert(sieve_extension_is(this_ext, variables_extension));
+	ctx = (struct ext_variables_validator_context *)
+		sieve_validator_extension_get_context(valdtr, this_ext);
+
+	if (ctx == NULL)
+		ctx = ext_variables_validator_context_create(this_ext, valdtr);
+	return ctx;
+}
+
+void ext_variables_validator_initialize(const struct sieve_extension *this_ext,
+					struct sieve_validator *valdtr)
+{
+	struct ext_variables_validator_context *ctx;
+
+	/* Create our context */
+	ctx = ext_variables_validator_context_get(this_ext, valdtr);
+
+	ext_variables_register_core_modifiers(this_ext, ctx);
+
+	ctx->active = TRUE;
+}
+
+struct sieve_variable *ext_variables_validator_get_variable(
+	const struct sieve_extension *this_ext,
+	struct sieve_validator *validator, const char *variable)
+{
+	struct ext_variables_validator_context *ctx =
+		ext_variables_validator_context_get(this_ext, validator);
+
+	return sieve_variable_scope_get_variable(ctx->local_scope, variable);
+}
+
+struct sieve_variable *
+ext_variables_validator_declare_variable(const struct sieve_extension *this_ext,
+					 struct sieve_validator *validator,
+					 const char *variable)
+{
+	struct ext_variables_validator_context *ctx =
+		ext_variables_validator_context_get(this_ext, validator);
+
+	return sieve_variable_scope_declare(ctx->local_scope, variable);
+}
+
+struct sieve_variable_scope *
+sieve_ext_variables_get_local_scope(const struct sieve_extension *var_ext,
+				    struct sieve_validator *validator)
+{
+	struct ext_variables_validator_context *ctx =
+		ext_variables_validator_context_get(var_ext, validator);
+
+	return ctx->local_scope;
+}
+
+bool sieve_ext_variables_is_active(const struct sieve_extension *var_ext,
+				   struct sieve_validator *valdtr)
+{
+	struct ext_variables_validator_context *ctx =
+		ext_variables_validator_context_get(var_ext, valdtr);
+
+	return (ctx != NULL && ctx->active);
+}
+
+/*
+ * Code generation
+ */
+
+bool ext_variables_generator_load(const struct sieve_extension *ext,
+				  const struct sieve_codegen_env *cgenv)
+{
+	struct sieve_variable_scope *local_scope =
+		ext_variables_ast_get_local_scope(ext, cgenv->ast);
+	unsigned int count = sieve_variable_scope_size(local_scope);
+	sieve_size_t jump;
+
+	sieve_binary_emit_unsigned(cgenv->sblock, count);
+
+	jump = sieve_binary_emit_offset(cgenv->sblock, 0);
+
+	if (count > 0) {
+		unsigned int size, i;
+		struct sieve_variable *const *vars =
+			sieve_variable_scope_get_variables(local_scope, &size);
+
+		for (i = 0; i < size; i++) {
+			sieve_binary_emit_cstring(cgenv->sblock,
+						  vars[i]->identifier);
+		}
+	}
+
+	sieve_binary_resolve_offset(cgenv->sblock, jump);
+	return TRUE;
+}
+
+/*
+ * Interpreter context
+ */
+
+struct ext_variables_interpreter_context {
+	pool_t pool;
+
+	struct sieve_variable_scope *local_scope;
+	struct sieve_variable_scope_binary *local_scope_bin;
+
+	struct sieve_variable_storage *local_storage;
+	ARRAY(struct sieve_variable_storage *) ext_storages;
+};
+
+static void
+ext_variables_interpreter_free(const struct sieve_extension *ext ATTR_UNUSED,
+			       struct sieve_interpreter *interp ATTR_UNUSED,
+			       void *context)
+{
+	struct ext_variables_interpreter_context *ctx =
+		(struct ext_variables_interpreter_context *)context;
+
+	sieve_variable_scope_binary_unref(&ctx->local_scope_bin);
+}
+
+static struct sieve_interpreter_extension
+variables_interpreter_extension = {
+	.ext_def = &variables_extension,
+	.free = ext_variables_interpreter_free
+};
+
+static struct ext_variables_interpreter_context *
+ext_variables_interpreter_context_create(
+	const struct sieve_extension *this_ext,
+	struct sieve_interpreter *interp,
+					struct sieve_variable_scope_binary *scpbin)
+{
+	pool_t pool = sieve_interpreter_pool(interp);
+	struct ext_variables_interpreter_context *ctx;
+
+	ctx = p_new(pool, struct ext_variables_interpreter_context, 1);
+	ctx->pool = pool;
+	ctx->local_scope = NULL;
+	ctx->local_scope_bin = scpbin;
+	ctx->local_storage =
+		sieve_variable_storage_create(this_ext, pool, scpbin);
+	p_array_init(&ctx->ext_storages, pool,
+		     sieve_extensions_get_count(this_ext->svinst));
+
+	sieve_interpreter_extension_register(interp, this_ext,
+					     &variables_interpreter_extension,
+					     (void *)ctx);
+	return ctx;
+}
+
+bool ext_variables_interpreter_load(const struct sieve_extension *ext,
+				    const struct sieve_runtime_env *renv,
+				    sieve_size_t *address)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	struct sieve_variable_scope_binary *scpbin;
+
+	scpbin = sieve_variable_scope_binary_read(eenv->svinst, ext, NULL,
+						  renv->sblock, address);
+	if (scpbin == NULL)
+		return FALSE;
+
+	/* Create our context */
+	(void)ext_variables_interpreter_context_create(ext, renv->interp,
+						       scpbin);
+
+	/* Enable support for match values */
+	(void)sieve_match_values_set_enabled(renv, TRUE);
+
+	return TRUE;
+}
+
+static inline struct ext_variables_interpreter_context *
+ext_variables_interpreter_context_get(const struct sieve_extension *this_ext,
+				      struct sieve_interpreter *interp)
+{
+	struct ext_variables_interpreter_context *ctx;
+
+	i_assert(sieve_extension_is(this_ext, variables_extension));
+	ctx = (struct ext_variables_interpreter_context *)
+		sieve_interpreter_extension_get_context(interp, this_ext);
+	return ctx;
+}
+
+struct sieve_variable_storage *
+sieve_ext_variables_runtime_get_storage(const struct sieve_extension *var_ext,
+					const struct sieve_runtime_env *renv,
+					const struct sieve_extension *ext)
+{
+	struct ext_variables_interpreter_context *ctx =
+		ext_variables_interpreter_context_get(var_ext, renv->interp);
+	struct sieve_variable_storage * const *storage;
+
+	if (ext == NULL)
+		return ctx->local_storage;
+
+	if (ext->id >= (int)array_count(&ctx->ext_storages))
+		storage = NULL;
+	else
+		storage = array_idx(&ctx->ext_storages, ext->id);
+
+	if (storage == NULL)
+		return NULL;
+	return *storage;
+}
+
+void sieve_ext_variables_runtime_set_storage(
+	const struct sieve_extension *var_ext,
+	const struct sieve_runtime_env *renv, const struct sieve_extension *ext,
+	struct sieve_variable_storage *storage)
+{
+	struct ext_variables_interpreter_context *ctx =
+		ext_variables_interpreter_context_get(var_ext, renv->interp);
+
+	if (ctx == NULL || ext == NULL || storage == NULL)
+		return;
+	if (ext->id < 0)
+		return;
+
+	array_idx_set(&ctx->ext_storages, (unsigned int) ext->id, &storage);
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-common.h b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-common.h
new file mode 100644
index 0000000..401d943
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-common.h
@@ -0,0 +1,102 @@
+#ifndef EXT_VARIABLES_COMMON_H
+#define EXT_VARIABLES_COMMON_H
+
+#include "sieve-common.h"
+#include "sieve-validator.h"
+
+#include "sieve-ext-variables.h"
+
+/*
+ * Extension
+ */
+
+struct ext_variables_config {
+	/* Maximum number of variables (in a scope) */
+	unsigned int max_scope_size;
+	/* Maximum size of variable value */
+	size_t max_variable_size;
+};
+
+extern const struct sieve_extension_def variables_extension;
+
+bool ext_variables_load(const struct sieve_extension *ext, void **context);
+void ext_variables_unload(const struct sieve_extension *ext);
+
+const struct ext_variables_config *
+ext_variables_get_config(const struct sieve_extension *var_ext);
+
+/*
+ * Commands
+ */
+
+extern const struct sieve_command_def cmd_set;
+extern const struct sieve_command_def tst_string;
+
+/*
+ * Operands
+ */
+
+enum ext_variables_operand {
+	EXT_VARIABLES_OPERAND_VARIABLE,
+	EXT_VARIABLES_OPERAND_MATCH_VALUE,
+	EXT_VARIABLES_OPERAND_NAMESPACE_VARIABLE,
+	EXT_VARIABLES_OPERAND_MODIFIER
+};
+
+/*
+ * Operations
+ */
+
+extern const struct sieve_operation_def cmd_set_operation;
+extern const struct sieve_operation_def tst_string_operation;
+
+enum ext_variables_opcode {
+	EXT_VARIABLES_OPERATION_SET,
+	EXT_VARIABLES_OPERATION_STRING
+};
+
+/*
+ * Validator context
+ */
+
+struct ext_variables_validator_context {
+	bool active;
+
+	struct sieve_validator_object_registry *modifiers;
+	struct sieve_validator_object_registry *namespaces;
+
+	struct sieve_variable_scope *local_scope;
+};
+
+void ext_variables_validator_initialize(const struct sieve_extension *this_ext,
+					struct sieve_validator *validator);
+
+struct ext_variables_validator_context *
+ext_variables_validator_context_get(const struct sieve_extension *this_ext,
+				    struct sieve_validator *valdtr);
+
+struct sieve_variable *
+ext_variables_validator_get_variable(const struct sieve_extension *this_ext,
+				     struct sieve_validator *validator,
+				     const char *variable);
+struct sieve_variable *
+ext_variables_validator_declare_variable(const struct sieve_extension *this_ext,
+					 struct sieve_validator *validator,
+					 const char *variable);
+
+/*
+ * Code generation
+ */
+
+bool ext_variables_generator_load(const struct sieve_extension *ext,
+				  const struct sieve_codegen_env *cgenv);
+
+/*
+ * Interpreter context
+ */
+
+bool ext_variables_interpreter_load(const struct sieve_extension *ext,
+				    const struct sieve_runtime_env *renv,
+				    sieve_size_t *address);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-dump.c b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-dump.c
new file mode 100644
index 0000000..26bd015
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-dump.c
@@ -0,0 +1,137 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+
+#include "sieve-common.h"
+#include "sieve-dump.h"
+#include "sieve-binary.h"
+#include "sieve-code.h"
+
+#include "ext-variables-common.h"
+#include "ext-variables-dump.h"
+
+/*
+ * Code dumper extension
+ */
+
+static void ext_variables_code_dumper_free
+	(struct sieve_code_dumper *dumper, void *context);
+
+static const struct sieve_code_dumper_extension
+variables_dump_extension = {
+	&variables_extension,
+	ext_variables_code_dumper_free
+};
+
+/*
+ * Code dump context
+ */
+
+struct ext_variables_dump_context {
+	struct sieve_variable_scope *local_scope;
+	ARRAY(struct sieve_variable_scope *) ext_scopes;
+};
+
+static void ext_variables_code_dumper_free
+(struct sieve_code_dumper *dumper ATTR_UNUSED, void *context)
+{
+	struct ext_variables_dump_context *dctx =
+		(struct ext_variables_dump_context *) context;
+
+	if ( dctx == NULL || dctx->local_scope == NULL )
+		return;
+
+	sieve_variable_scope_unref(&dctx->local_scope);
+}
+
+static struct ext_variables_dump_context *ext_variables_dump_get_context
+(const struct sieve_extension *this_ext, const struct sieve_dumptime_env *denv)
+{
+	struct sieve_code_dumper *dumper = denv->cdumper;
+	struct ext_variables_dump_context *dctx;
+	pool_t pool;
+
+	i_assert( sieve_extension_is(this_ext, variables_extension) );
+	dctx = sieve_dump_extension_get_context(dumper, this_ext);
+
+	if ( dctx == NULL ) {
+		/* Create dumper context */
+		pool = sieve_code_dumper_pool(dumper);
+		dctx = p_new(pool, struct ext_variables_dump_context, 1);
+		p_array_init(&dctx->ext_scopes, pool,
+			sieve_extensions_get_count(this_ext->svinst));
+
+		sieve_dump_extension_register
+			(dumper, this_ext, &variables_dump_extension, dctx);
+	}
+
+	return dctx;
+}
+
+bool ext_variables_code_dump
+(const struct sieve_extension *ext,
+	const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	struct ext_variables_dump_context *dctx;
+	struct sieve_variable_scope *local_scope;
+
+	local_scope = sieve_variable_scope_binary_dump
+		(ext->svinst, ext, NULL, denv, address);
+
+	dctx = ext_variables_dump_get_context(ext, denv);
+	dctx->local_scope = local_scope;
+
+	return TRUE;
+}
+
+/*
+ * Scope registry
+ */
+
+void sieve_ext_variables_dump_set_scope
+(const struct sieve_extension *var_ext, const struct sieve_dumptime_env *denv,
+	const struct sieve_extension *ext, struct sieve_variable_scope *scope)
+{
+	struct ext_variables_dump_context *dctx =
+		ext_variables_dump_get_context(var_ext, denv);
+
+	if ( ext->id < 0 ) return;
+
+	array_idx_set(&dctx->ext_scopes, (unsigned int) ext->id, &scope);
+}
+
+/*
+ * Variable identifier dump
+ */
+
+const char *ext_variables_dump_get_identifier
+(const struct sieve_extension *var_ext, const struct sieve_dumptime_env *denv,
+	const struct sieve_extension *ext, unsigned int index)
+{
+	struct ext_variables_dump_context *dctx =
+		ext_variables_dump_get_context(var_ext, denv);
+	struct sieve_variable_scope *scope;
+	struct sieve_variable *var;
+
+	if ( ext == NULL )
+		scope = dctx->local_scope;
+	else {
+		struct sieve_variable_scope *const *ext_scope;
+
+		if  ( ext->id < 0 || ext->id >= (int) array_count(&dctx->ext_scopes) )
+			return NULL;
+
+		ext_scope = array_idx(&dctx->ext_scopes, (unsigned int) ext->id);
+		scope = *ext_scope;
+	}
+
+	if ( scope == NULL )
+		return NULL;
+
+	var = sieve_variable_scope_get_indexed(scope, index);
+
+	return var->identifier;
+}
+
diff --git a/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-dump.h b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-dump.h
new file mode 100644
index 0000000..da72a5d
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-dump.h
@@ -0,0 +1,22 @@
+#ifndef EXT_VARIABLES_DUMP_H
+#define EXT_VARIABLES_DUMP_H
+
+#include "sieve-common.h"
+
+/*
+ * Code dump context
+ */
+
+bool ext_variables_code_dump
+	(const struct sieve_extension *ext, const struct sieve_dumptime_env *denv,
+		sieve_size_t *address);
+
+/*
+ * Variable identifier dump
+ */
+
+const char *ext_variables_dump_get_identifier
+(const struct sieve_extension *var_ext, const struct sieve_dumptime_env *denv,
+	const struct sieve_extension *ext, unsigned int index);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-limits.h b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-limits.h
new file mode 100644
index 0000000..61260c8
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-limits.h
@@ -0,0 +1,35 @@
+#ifndef EXT_VARIABLES_LIMITS_H
+#define EXT_VARIABLES_LIMITS_H
+
+#include "sieve-limits.h"
+
+/* From RFC 5229:
+ *
+ * 6.  Implementation Limits
+ *
+ *  An implementation of this document MUST support at least 128 distinct
+ *  variables.  The supported length of variable names MUST be at least
+ *  32 characters.  Each variable MUST be able to hold at least 4000
+ *  characters.  Attempts to set the variable to a value larger than what
+ *  the implementation supports SHOULD be reported as an error at
+ *  compile-time if possible.  If the attempt is discovered during run-
+ *  time, the value SHOULD be truncated, and it MUST NOT be treated as an
+ *  error.
+
+ *  Match variables ${1} through ${9} MUST be supported.  References to
+ *  higher indices than those the implementation supports MUST be treated
+ *  as a syntax error, which SHOULD be discovered at compile-time.
+ */
+
+#define EXT_VARIABLES_DEFAULT_MAX_SCOPE_SIZE     255
+#define EXT_VARIABLES_DEFAULT_MAX_VARIABLE_SIZE  (4 * 1024)
+
+#define EXT_VARIABLES_REQUIRED_MAX_SCOPE_SIZE    128
+#define EXT_VARIABLES_REQUIRED_MAX_VARIABLE_SIZE 4000
+
+#define EXT_VARIABLES_MAX_VARIABLE_NAME_LEN      64
+#define EXT_VARIABLES_MAX_NAMESPACE_ELEMENTS     10
+
+#define EXT_VARIABLES_MAX_MATCH_INDEX            SIEVE_MAX_MATCH_VALUES
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-modifiers.c b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-modifiers.c
new file mode 100644
index 0000000..dd21c88
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-modifiers.c
@@ -0,0 +1,578 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "unichar.h"
+#include "str-sanitize.h"
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-runtime.h"
+
+#include "ext-variables-common.h"
+#include "ext-variables-limits.h"
+#include "ext-variables-modifiers.h"
+
+#include <ctype.h>
+
+/*
+ * Core modifiers
+ */
+
+extern const struct sieve_variables_modifier_def lower_modifier;
+extern const struct sieve_variables_modifier_def upper_modifier;
+extern const struct sieve_variables_modifier_def lowerfirst_modifier;
+extern const struct sieve_variables_modifier_def upperfirst_modifier;
+extern const struct sieve_variables_modifier_def quotewildcard_modifier;
+extern const struct sieve_variables_modifier_def length_modifier;
+
+enum ext_variables_modifier_code {
+    EXT_VARIABLES_MODIFIER_LOWER,
+    EXT_VARIABLES_MODIFIER_UPPER,
+    EXT_VARIABLES_MODIFIER_LOWERFIRST,
+    EXT_VARIABLES_MODIFIER_UPPERFIRST,
+    EXT_VARIABLES_MODIFIER_QUOTEWILDCARD,
+    EXT_VARIABLES_MODIFIER_LENGTH
+};
+
+const struct sieve_variables_modifier_def *ext_variables_core_modifiers[] = {
+	&lower_modifier,
+	&upper_modifier,
+	&lowerfirst_modifier,
+	&upperfirst_modifier,
+	&quotewildcard_modifier,
+	&length_modifier
+};
+
+const unsigned int ext_variables_core_modifiers_count =
+    N_ELEMENTS(ext_variables_core_modifiers);
+
+#define ext_variables_modifier_name(modf) \
+	(modf)->object->def->name
+#define ext_variables_modifiers_equal(modf1, modf2) \
+	( (modf1)->def == (modf2)->def )
+#define ext_variables_modifiers_equal_precedence(modf1, modf2) \
+	( (modf1)->def->precedence == (modf2)->def->precendence )
+
+/*
+ * Modifier registry
+ */
+
+void sieve_variables_modifier_register
+(const struct sieve_extension *var_ext, struct sieve_validator *valdtr,
+	const struct sieve_extension *ext,
+	const struct sieve_variables_modifier_def *smodf_def)
+{
+	struct ext_variables_validator_context *ctx =
+		ext_variables_validator_context_get(var_ext, valdtr);
+
+	sieve_validator_object_registry_add(ctx->modifiers, ext, &smodf_def->obj_def);
+}
+
+bool ext_variables_modifier_exists
+(const struct sieve_extension *var_ext, struct sieve_validator *valdtr,
+	const char *identifier)
+{
+	struct ext_variables_validator_context *ctx =
+		ext_variables_validator_context_get(var_ext, valdtr);
+
+	return sieve_validator_object_registry_find(ctx->modifiers, identifier, NULL);
+}
+
+const struct sieve_variables_modifier *ext_variables_modifier_create_instance
+(const struct sieve_extension *var_ext, struct sieve_validator *valdtr,
+	struct sieve_command *cmd, const char *identifier)
+{
+	struct ext_variables_validator_context *ctx =
+		ext_variables_validator_context_get(var_ext, valdtr);
+	struct sieve_object object;
+	struct sieve_variables_modifier *modf;
+	pool_t pool;
+
+	if ( !sieve_validator_object_registry_find
+		(ctx->modifiers, identifier, &object) )
+		return NULL;
+
+	pool = sieve_command_pool(cmd);
+	modf = p_new(pool, struct sieve_variables_modifier, 1);
+	modf->object = object;
+	modf->var_ext = var_ext;
+	modf->def = (const struct sieve_variables_modifier_def *) object.def;
+
+  return modf;
+}
+
+void ext_variables_register_core_modifiers
+(const struct sieve_extension *ext, struct ext_variables_validator_context *ctx)
+{
+	unsigned int i;
+
+	/* Register core modifiers*/
+	for ( i = 0; i < ext_variables_core_modifiers_count; i++ ) {
+		sieve_validator_object_registry_add
+			(ctx->modifiers, ext, &(ext_variables_core_modifiers[i]->obj_def));
+	}
+}
+
+/*
+ * Core modifiers
+ */
+
+/* Forward declarations */
+
+static bool
+mod_lower_modify(const struct sieve_variables_modifier *modf,
+		 string_t *in, string_t **result);
+static bool
+mod_upper_modify(const struct sieve_variables_modifier *modf,
+		 string_t *in, string_t **result);
+static bool
+mod_lowerfirst_modify(const struct sieve_variables_modifier *modf,
+		      string_t *in, string_t **result);
+static bool
+mod_upperfirst_modify(const struct sieve_variables_modifier *modf,
+		      string_t *in, string_t **result);
+static bool
+mod_length_modify(const struct sieve_variables_modifier *modf,
+		  string_t *in, string_t **result);
+static bool
+mod_quotewildcard_modify(const struct sieve_variables_modifier *modf,
+			 string_t *in, string_t **result);
+
+/* Modifier objects */
+
+const struct sieve_variables_modifier_def lower_modifier = {
+	SIEVE_OBJECT("lower", &modifier_operand, EXT_VARIABLES_MODIFIER_LOWER),
+	40,
+	mod_lower_modify
+};
+
+const struct sieve_variables_modifier_def upper_modifier = {
+	SIEVE_OBJECT("upper", &modifier_operand, EXT_VARIABLES_MODIFIER_UPPER),
+	40,
+	mod_upper_modify
+};
+
+const struct sieve_variables_modifier_def lowerfirst_modifier = {
+	SIEVE_OBJECT
+		("lowerfirst", &modifier_operand, EXT_VARIABLES_MODIFIER_LOWERFIRST),
+	30,
+	mod_lowerfirst_modify
+};
+
+const struct sieve_variables_modifier_def upperfirst_modifier = {
+	SIEVE_OBJECT
+		("upperfirst", &modifier_operand,	EXT_VARIABLES_MODIFIER_UPPERFIRST),
+	30,
+	mod_upperfirst_modify
+};
+
+const struct sieve_variables_modifier_def quotewildcard_modifier = {
+	SIEVE_OBJECT
+		("quotewildcard", &modifier_operand, EXT_VARIABLES_MODIFIER_QUOTEWILDCARD),
+	20,
+	mod_quotewildcard_modify
+};
+
+const struct sieve_variables_modifier_def length_modifier = {
+	SIEVE_OBJECT("length", &modifier_operand, EXT_VARIABLES_MODIFIER_LENGTH),
+	10,
+	mod_length_modify
+};
+
+/* Modifier implementations */
+
+static bool
+mod_upperfirst_modify(const struct sieve_variables_modifier *modf ATTR_UNUSED,
+		      string_t *in, string_t **result)
+{
+	char *content;
+
+	if ( str_len(in) == 0 ) {
+		*result = in;
+		return TRUE;
+	}
+
+	*result = t_str_new(str_len(in));
+	str_append_str(*result, in);
+
+	content = str_c_modifiable(*result);
+	content[0] = i_toupper(content[0]);
+
+	return TRUE;
+}
+
+static bool
+mod_lowerfirst_modify(const struct sieve_variables_modifier *modf ATTR_UNUSED,
+		      string_t *in, string_t **result)
+{
+	char *content;
+
+	if ( str_len(in) == 0 ) {
+		*result = in;
+		return TRUE;
+	}
+
+	*result = t_str_new(str_len(in));
+	str_append_str(*result, in);
+
+	content = str_c_modifiable(*result);
+	content[0] = i_tolower(content[0]);
+
+	return TRUE;
+}
+
+static bool
+mod_upper_modify(const struct sieve_variables_modifier *modf ATTR_UNUSED,
+		 string_t *in, string_t **result)
+{
+	char *content;
+
+	if ( str_len(in) == 0 ) {
+		*result = in;
+		return TRUE;
+	}
+
+	*result = t_str_new(str_len(in));
+	str_append_str(*result, in);
+
+	content = str_c_modifiable(*result);
+	(void)str_ucase(content);
+
+	return TRUE;
+}
+
+static bool
+mod_lower_modify(const struct sieve_variables_modifier *modf ATTR_UNUSED,
+		 string_t *in, string_t **result)
+{
+	char *content;
+
+	if ( str_len(in) == 0 ) {
+		*result = in;
+		return TRUE;
+	}
+
+	*result = t_str_new(str_len(in));
+	str_append_str(*result, in);
+
+	content = str_c_modifiable(*result);
+	(void)str_lcase(content);
+
+	return TRUE;
+}
+
+static bool
+mod_length_modify(const struct sieve_variables_modifier *modf ATTR_UNUSED,
+		  string_t *in, string_t **result)
+{
+	*result = t_str_new(64);
+	str_printfa(*result, "%llu", (unsigned long long)
+		uni_utf8_strlen_n(str_data(in), str_len(in)));
+	return TRUE;
+}
+
+static bool
+mod_quotewildcard_modify(const struct sieve_variables_modifier *modf,
+			 string_t *in, string_t **result)
+{
+	size_t max_var_size =
+		sieve_variables_get_max_variable_size(modf->var_ext);
+	const unsigned char *p, *poff, *pend;
+	size_t new_size;
+
+	if ( str_len(in) == 0 ) {
+		/* empty string */
+		*result = in;
+		return TRUE;
+	}
+
+	/* allocate new string */
+	new_size = str_len(in) + 16;
+	if (new_size > max_var_size)
+		new_size = max_var_size;
+	*result = t_str_new(new_size + 1);
+
+	/* escape string */
+	p = str_data(in);
+	pend = p + str_len(in);
+	poff = p;
+	while (p < pend) {
+		unsigned int n = uni_utf8_char_bytes((char)*p);
+
+		if (n == 1 && (*p == '*' || *p == '?' || *p == '\\')) {
+			str_append_data(*result, poff, p - poff);
+			poff = p;
+
+			if (str_len(*result) + 2 > max_var_size)
+				break;
+
+			str_append_c(*result, '\\');
+		} else if ((str_len(*result) + (p - poff) + n) > max_var_size) {
+			break;
+		}
+		if (p + n > pend) {
+			p = pend;
+			break;
+		}
+		p += n;
+	}
+
+	str_append_data(*result, poff, p - poff);
+
+	return TRUE;
+}
+
+/*
+ * Modifier argument
+ */
+
+/* [MODIFIER]:
+ *   ":lower" / ":upper" / ":lowerfirst" / ":upperfirst" /
+ *             ":quotewildcard" / ":length"
+ */
+
+/* Forward declarations */
+
+static bool tag_modifier_is_instance_of
+	(struct sieve_validator *valdtr, struct sieve_command *cmd,
+		const struct sieve_extension *ext, const char *identifier, void **context);
+
+/* Modifier tag object */
+
+static const struct sieve_argument_def modifier_tag = {
+	.identifier = "MODIFIER",
+	.flags = SIEVE_ARGUMENT_FLAG_MULTIPLE,
+	.is_instance_of = tag_modifier_is_instance_of
+};
+
+/* Modifier tag implementation */
+
+static bool tag_modifier_is_instance_of
+(struct sieve_validator *valdtr, struct sieve_command *cmd,
+	const struct sieve_extension *ext, const char *identifier, void **data)
+{
+	const struct sieve_variables_modifier *modf;
+
+	if ( data == NULL ) {
+		return ext_variables_modifier_exists(ext, valdtr, identifier);
+	}
+
+	if ( (modf=ext_variables_modifier_create_instance
+		(ext, valdtr, cmd, identifier)) == NULL )
+		return FALSE;
+
+	*data = (void *) modf;
+
+	return TRUE;
+}
+
+/* Registration */
+
+void sieve_variables_modifiers_link_tag
+(struct sieve_validator *valdtr, const struct sieve_extension *var_ext,
+	struct sieve_command_registration *cmd_reg)
+{
+	sieve_validator_register_tag(valdtr, cmd_reg, var_ext, &modifier_tag, 0);
+}
+
+/* Validation */
+
+bool sieve_variables_modifiers_validate
+(struct sieve_validator *valdtr, struct sieve_command *cmd,
+	ARRAY_TYPE(sieve_variables_modifier) *modifiers)
+{
+	struct sieve_ast_argument *arg;
+
+	arg = sieve_command_first_argument(cmd);
+	while ( arg != NULL && arg != cmd->first_positional ) {
+		const struct sieve_variables_modifier *modfs;
+		const struct sieve_variables_modifier *modf;
+		unsigned int i, modf_count;
+		bool inserted;
+
+		if ( !sieve_argument_is(arg, modifier_tag) ) {
+			arg = sieve_ast_argument_next(arg);
+			continue;
+		}
+		modf = (const struct sieve_variables_modifier *)
+			arg->argument->data;
+
+		inserted = FALSE;
+		modfs = array_get(modifiers, &modf_count);
+		for ( i = 0; i < modf_count && !inserted; i++ ) {
+
+			if ( modfs[i].def->precedence == modf->def->precedence ) {
+				sieve_argument_validate_error(valdtr, arg,
+					"modifiers :%s and :%s specified for the set command conflict "
+					"having equal precedence",
+					modfs[i].def->obj_def.identifier, modf->def->obj_def.identifier);
+				return FALSE;
+			}
+
+			if ( modfs[i].def->precedence < modf->def->precedence ) {
+				array_insert(modifiers, i, modf, 1);
+				inserted = TRUE;
+			}
+		}
+
+		if ( !inserted )
+			array_append(modifiers, modf, 1);
+
+		/* Added to modifier list;
+		   self-destruct to prevent implicit code generation */
+		arg = sieve_ast_arguments_detach(arg, 1);
+	}
+	return TRUE;
+}
+
+bool sieve_variables_modifiers_generate
+(const struct sieve_codegen_env *cgenv,
+	ARRAY_TYPE(sieve_variables_modifier) *modifiers)
+{
+	struct sieve_binary_block *sblock = cgenv->sblock;
+	const struct sieve_variables_modifier *modfs;
+	unsigned int i, modf_count;
+
+	sieve_binary_emit_byte(sblock, array_count(modifiers));
+
+	modfs = array_get(modifiers, &modf_count);
+	for ( i = 0; i < modf_count; i++ ) {
+		ext_variables_opr_modifier_emit(sblock,
+			modfs[i].object.ext, modfs[i].def);
+	}
+	return TRUE;
+}
+
+/*
+ * Modifier coding
+ */
+
+const struct sieve_operand_class sieve_variables_modifier_operand_class =
+	{ "modifier" };
+
+static const struct sieve_extension_objects core_modifiers =
+	SIEVE_VARIABLES_DEFINE_MODIFIERS(ext_variables_core_modifiers);
+
+const struct sieve_operand_def modifier_operand = {
+	.name = "modifier",
+	.ext_def = &variables_extension,
+	.code = EXT_VARIABLES_OPERAND_MODIFIER,
+	.class = &sieve_variables_modifier_operand_class,
+	.interface = &core_modifiers
+};
+
+bool sieve_variables_modifiers_code_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	unsigned int mdfs, i;
+
+	/* Read the number of applied modifiers we need to read */
+	if ( !sieve_binary_read_byte(denv->sblock, address, &mdfs) )
+		return FALSE;
+
+	/* Print all modifiers (sorted during code generation already) */
+	for ( i = 0; i < mdfs; i++ ) {
+		if ( !ext_variables_opr_modifier_dump(denv, address) )
+			return FALSE;
+	}
+	return TRUE;
+}
+
+int sieve_variables_modifiers_code_read(
+	const struct sieve_runtime_env *renv,
+	const struct sieve_extension *var_ext, sieve_size_t *address,
+	ARRAY_TYPE(sieve_variables_modifier) *modifiers)
+{
+	unsigned int lprec, mdfs, i;
+
+	if ( !sieve_binary_read_byte(renv->sblock, address, &mdfs) ) {
+		sieve_runtime_trace_error(renv, "invalid modifier count");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	t_array_init(modifiers, mdfs);
+
+	lprec = (unsigned int)-1;
+	for ( i = 0; i < mdfs; i++ ) {
+		struct sieve_variables_modifier modf;
+
+		if ( !ext_variables_opr_modifier_read(renv, var_ext,
+						      address, &modf) )
+			return SIEVE_EXEC_BIN_CORRUPT;
+		if ( modf.def != NULL ) {
+			if ( modf.def->precedence >= lprec ) {
+				sieve_runtime_trace_error(renv,
+					"unsorted modifier precedence");
+				return SIEVE_EXEC_BIN_CORRUPT;
+			}
+			lprec = modf.def->precedence;
+		}
+
+		array_append(modifiers, &modf, 1);
+	}
+
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Modifier application
+ */
+
+int sieve_variables_modifiers_apply
+(const struct sieve_runtime_env *renv,
+	const struct sieve_extension *var_ext,
+	ARRAY_TYPE(sieve_variables_modifier) *modifiers,
+	string_t **value)
+{	
+	const struct ext_variables_config *config =
+		ext_variables_get_config(var_ext);
+	const struct sieve_variables_modifier *modfs;
+	unsigned int i, modf_count;
+
+	/* Hold value within limits */
+	if ( str_len(*value) > config->max_variable_size ) {
+		/* assume variable originates from code, so copy it first */
+		string_t *new_value = t_str_new(config->max_variable_size+3);
+		str_append_str(new_value, *value);
+		*value = new_value;
+		str_truncate_utf8(*value, config->max_variable_size);
+	}
+	
+	if ( !array_is_created(modifiers) )
+		return SIEVE_EXEC_OK;
+
+	modfs = array_get(modifiers, &modf_count);
+	if ( modf_count == 0 )
+		return SIEVE_EXEC_OK;
+
+	for ( i = 0; i < modf_count; i++ ) {
+		string_t *new_value;
+		const struct sieve_variables_modifier *modf = &modfs[i];
+
+		if ( modf->def != NULL && modf->def->modify != NULL ) {
+			if ( !modf->def->modify(modf, *value, &new_value) )
+				return SIEVE_EXEC_FAILURE;
+
+			*value = new_value;
+			if ( *value == NULL )
+				return SIEVE_EXEC_FAILURE;
+
+			sieve_runtime_trace_here
+				(renv, SIEVE_TRLVL_COMMANDS,
+					"modify :%s \"%s\" => \"%s\"",
+					sieve_variables_modifier_name(modf),
+					str_sanitize(str_c(*value), 256),
+					str_sanitize(str_c(new_value), 256));
+
+			/* Hold value within limits */
+			if ( str_len(*value) > config->max_variable_size )
+				str_truncate_utf8(*value, config->max_variable_size);
+		}
+	}
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-modifiers.h b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-modifiers.h
new file mode 100644
index 0000000..50b4256
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-modifiers.h
@@ -0,0 +1,66 @@
+#ifndef EXT_VARIABLES_MODIFIERS_H
+#define EXT_VARIABLES_MODIFIERS_H
+
+#include "sieve-common.h"
+#include "sieve-runtime-trace.h"
+
+#include "ext-variables-common.h"
+
+#define ext_variables_namespace_name(nspc) \
+	(nspc)->object->def->name
+#define ext_variables_namespaces_equal(nspc1, nspc2) \
+	( (nspc1)->def == (nspc2)->def ))
+
+/*
+ * Modifier registry
+ */
+
+bool ext_variables_modifier_exists
+	(const struct sieve_extension *var_ext, struct sieve_validator *valdtr,
+		const char *identifier);
+const struct sieve_variables_modifier *ext_variables_modifier_create_instance
+	(const struct sieve_extension *var_ext, struct sieve_validator *valdtr,
+		struct sieve_command *cmd, const char *identifier);
+
+void ext_variables_register_core_modifiers
+	(const struct sieve_extension *var_ext,
+		struct ext_variables_validator_context *ctx);
+
+/*
+ * Modifier operand
+ */
+
+extern const struct sieve_operand_def modifier_operand;
+
+static inline void ext_variables_opr_modifier_emit
+(struct sieve_binary_block *sblock, const struct sieve_extension *ext,
+	const struct sieve_variables_modifier_def *modf_def)
+{
+	sieve_opr_object_emit(sblock, ext, &modf_def->obj_def);
+}
+
+static inline bool
+ext_variables_opr_modifier_read(const struct sieve_runtime_env *renv,
+				const struct sieve_extension *var_ext,
+				sieve_size_t *address,
+				struct sieve_variables_modifier *modf)
+{
+	if ( !sieve_opr_object_read
+		(renv, &sieve_variables_modifier_operand_class, address, &modf->object) ) {
+		sieve_runtime_trace_error(renv, "invalid modifier operand");
+		return FALSE;
+	}
+
+	modf->def = (const struct sieve_variables_modifier_def *) modf->object.def;
+	modf->var_ext = var_ext;
+	return TRUE;
+}
+
+static inline bool ext_variables_opr_modifier_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	return sieve_opr_object_dump
+		(denv, &sieve_variables_modifier_operand_class, address, NULL);
+}
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-name.c b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-name.c
new file mode 100644
index 0000000..fac0b71
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-name.c
@@ -0,0 +1,110 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "array.h"
+
+#include "sieve-common.h"
+
+#include "ext-variables-common.h"
+#include "ext-variables-limits.h"
+#include "ext-variables-name.h"
+
+#include <ctype.h>
+
+bool sieve_variable_identifier_is_valid(const char *identifier)
+{
+	const char *p = identifier;
+	size_t plen = strlen(identifier);
+	const char *pend;
+
+	if ( plen == 0 || plen >= EXT_VARIABLES_MAX_VARIABLE_NAME_LEN )
+		return FALSE;
+
+	pend = PTR_OFFSET(identifier, plen);
+
+	if ( *p == '_' || i_isalpha(*p) ) {
+		p++;
+
+		while ( p < pend && (*p == '_' || i_isalnum(*p)) ) {
+			p++;
+		}
+	}
+
+	return ( p == pend );
+}
+
+int ext_variable_name_parse
+(ARRAY_TYPE(sieve_variable_name) *vname, const char **str, const char *strend)
+{
+	const char *p = *str;
+
+	array_clear(vname);
+
+	while ( p < strend ) {
+		struct sieve_variable_name *cur_element;
+		string_t *cur_ident;
+
+		/* Acquire current position in the array */
+
+		if ( array_count(vname) >= EXT_VARIABLES_MAX_NAMESPACE_ELEMENTS )
+			return -1;
+
+		cur_element = array_append_space(vname);
+		cur_ident = cur_element->identifier = t_str_new(32);
+
+		/* Parse element */
+
+		/* Identifier */
+		if ( *p == '_' || i_isalpha(*p) ) {
+			cur_element->num_variable = -1;
+			str_truncate(cur_ident, 0);
+			str_append_c(cur_ident, *p);
+			p++;
+
+			while ( p < strend && (*p == '_' || i_isalnum(*p)) ) {
+				if ( str_len(cur_ident) >= EXT_VARIABLES_MAX_VARIABLE_NAME_LEN )
+					return -1;
+				str_append_c(cur_ident, *p);
+				p++;
+			}
+
+		/* Num-variable */
+		} else if ( i_isdigit(*p) ) {
+			cur_element->num_variable = *p - '0';
+			p++;
+
+			while ( p < strend && i_isdigit(*p) ) {
+				cur_element->num_variable = cur_element->num_variable*10 + (*p - '0');
+				p++;
+			}
+
+			/* If a num-variable is first, no more elements can follow because no
+			 * namespace is specified.
+			 */
+			if ( array_count(vname) == 1 ) {
+				*str = p;
+				return 1;
+			}
+		} else {
+			*str = p;
+			return -1;
+		}
+
+		/* Check whether next name element is present */
+		if ( p < strend && *p == '.' ) {
+			p++;
+
+			/* It may not be empty */
+			if ( p >= strend )
+				return -1;
+		} else
+			break;
+	}
+
+	*str = p;
+	return array_count(vname);
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-name.h b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-name.h
new file mode 100644
index 0000000..289a978
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-name.h
@@ -0,0 +1,43 @@
+#ifndef EXT_VARIABLES_NAME_H
+#define EXT_VARIABLES_NAME_H
+
+/* Variable Substitution
+ * ---------------------
+ *
+ * The variable strings are preprocessed into an AST list consisting of variable
+ * substitutions and constant parts of the string. The variables to which
+ * the substitutions link are looked up and their index in their scope storage
+ * is what is added to the list and eventually emitted as byte code. So, in
+ * bytecode a variable string will look as a series of substrings interrupted by
+ * integer operands that refer to variables. During execution, the strings and
+ * the looked-up variables are concatenated to obtain the desired result. The
+ * the variable references are simple indexes into an array of variables, so
+ * looking these up during execution is a trivial process.
+ *
+ * However (RFC 5229):
+ *   Tests or actions in future extensions may need to access the
+ *   unexpanded version of the string argument and, e.g., do the expansion
+ *   after setting variables in its namespace.  The design of the
+ *   implementation should allow this.
+ *
+ * Various options exist to provide this feature. If the extension is entirely
+ * namespace-based there is actually not very much of a problem. The variable
+ * list can easily be extended with new argument-types that refer to a variable
+ * identifier instead of an index in the variable's storage.
+ */
+
+#include "lib.h"
+#include "array.h"
+
+#include "sieve-common.h"
+
+#include "ext-variables-common.h"
+
+/*
+ * Variable name parsing
+ */
+
+int ext_variable_name_parse
+	(ARRAY_TYPE(sieve_variable_name) *vname, const char **str, const char *strend);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-namespaces.c b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-namespaces.c
new file mode 100644
index 0000000..4df62e2
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-namespaces.c
@@ -0,0 +1,236 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+#include "sieve-dump.h"
+
+#include "ext-variables-common.h"
+#include "ext-variables-namespaces.h"
+
+#include <ctype.h>
+
+/*
+ * Namespace registry
+ */
+
+void sieve_variables_namespace_register
+(const struct sieve_extension *var_ext, struct sieve_validator *valdtr,
+	const struct sieve_extension *ext,
+	const struct sieve_variables_namespace_def *nspc_def)
+{
+	struct ext_variables_validator_context *ctx =
+		ext_variables_validator_context_get(var_ext, valdtr);
+
+	sieve_validator_object_registry_add(ctx->namespaces, ext, &nspc_def->obj_def);
+}
+
+bool ext_variables_namespace_exists
+(const struct sieve_extension *var_ext, struct sieve_validator *valdtr,
+	const char *identifier)
+{
+	struct ext_variables_validator_context *ctx =
+		ext_variables_validator_context_get(var_ext, valdtr);
+
+	return sieve_validator_object_registry_find
+		(ctx->namespaces, identifier, NULL);
+}
+
+const struct sieve_variables_namespace *ext_variables_namespace_create_instance
+(const struct sieve_extension *var_ext, struct sieve_validator *valdtr,
+	struct sieve_command *cmd, const char *identifier)
+{
+	struct ext_variables_validator_context *ctx =
+		ext_variables_validator_context_get(var_ext, valdtr);
+	struct sieve_object object;
+	struct sieve_variables_namespace *nspc;
+	pool_t pool;
+
+	if ( !sieve_validator_object_registry_find
+		(ctx->namespaces, identifier, &object) )
+		return NULL;
+
+	pool = sieve_command_pool(cmd);
+	nspc = p_new(pool, struct sieve_variables_namespace, 1);
+	nspc->object = object;
+	nspc->def = (const struct sieve_variables_namespace_def *) object.def;
+
+  return nspc;
+}
+
+/*
+ * Namespace variable argument
+ */
+
+struct arg_namespace_variable {
+	const struct sieve_variables_namespace *namespace;
+
+	void *data;
+};
+
+static bool arg_namespace_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+	struct sieve_command *context ATTR_UNUSED);
+
+const struct sieve_argument_def namespace_argument = {
+	.identifier = "@namespace",
+	.generate = arg_namespace_generate
+};
+
+bool ext_variables_namespace_argument_activate
+(const struct sieve_extension *this_ext, struct sieve_validator *valdtr,
+	struct sieve_ast_argument *arg, struct sieve_command *cmd,
+	ARRAY_TYPE(sieve_variable_name) *var_name, bool assignment)
+{
+	pool_t pool = sieve_command_pool(cmd);
+	struct sieve_ast *ast = arg->ast;
+	const struct sieve_variables_namespace *nspc;
+	struct arg_namespace_variable *var;
+	const struct sieve_variable_name *name_element = array_idx(var_name, 0);
+	void *var_data = NULL;
+
+	nspc = ext_variables_namespace_create_instance
+		(this_ext, valdtr, cmd, str_c(name_element->identifier));
+	if ( nspc == NULL ) {
+		sieve_argument_validate_error(valdtr, arg,
+			"referring to variable in unknown namespace '%s'",
+			str_c(name_element->identifier));
+		return FALSE;
+	}
+
+	if ( nspc->def != NULL && nspc->def->validate != NULL &&
+		!nspc->def->validate
+			(valdtr, nspc, arg, cmd, var_name, &var_data, assignment) ) {
+		return FALSE;
+	}
+
+	var = p_new(pool, struct arg_namespace_variable, 1);
+	var->namespace = nspc;
+	var->data = var_data;
+
+	arg->argument = sieve_argument_create(ast, &namespace_argument, this_ext, 0);
+	arg->argument->data = (void *) var;
+
+	return TRUE;
+}
+
+struct sieve_ast_argument *ext_variables_namespace_argument_create
+(const struct sieve_extension *this_ext,
+	struct sieve_validator *valdtr, struct sieve_ast_argument *parent_arg,
+	struct sieve_command *cmd, ARRAY_TYPE(sieve_variable_name) *var_name)
+{
+	struct sieve_ast *ast = parent_arg->ast;
+	struct sieve_ast_argument *new_arg;
+
+	new_arg = sieve_ast_argument_create(ast, sieve_ast_argument_line(parent_arg));
+	new_arg->type = SAAT_STRING;
+
+	if ( !ext_variables_namespace_argument_activate
+		(this_ext, valdtr, new_arg, cmd, var_name, FALSE) )
+		return NULL;
+
+	return new_arg;
+}
+
+static bool arg_namespace_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+	struct sieve_command *cmd)
+{
+	struct sieve_argument *argument = arg->argument;
+	struct arg_namespace_variable *var =
+		(struct arg_namespace_variable *) argument->data;
+	const struct sieve_variables_namespace *nspc = var->namespace;
+
+	if ( nspc->def != NULL && nspc->def->generate != NULL )
+		return nspc->def->generate(cgenv, nspc, arg, cmd, var->data);
+
+	return TRUE;
+}
+
+/*
+ * Namespace variable operands
+ */
+
+const struct sieve_operand_class sieve_variables_namespace_operand_class =
+	{ "variable-namespace" };
+
+static bool opr_namespace_variable_dump
+	(const struct sieve_dumptime_env *denv, const struct sieve_operand *oprnd,
+		sieve_size_t *address);
+static int opr_namespace_variable_read
+	(const struct sieve_runtime_env *renv, const struct sieve_operand *oprnd,
+		sieve_size_t *address, string_t **str_r);
+
+static const struct sieve_opr_string_interface namespace_variable_interface = {
+	opr_namespace_variable_dump,
+	opr_namespace_variable_read
+};
+
+const struct sieve_operand_def namespace_variable_operand = {
+	.name = "namespace",
+	.ext_def = &variables_extension,
+	.code = EXT_VARIABLES_OPERAND_NAMESPACE_VARIABLE,
+	.class = &string_class,
+	.interface = &namespace_variable_interface
+};
+
+void sieve_variables_opr_namespace_variable_emit
+(struct sieve_binary_block *sblock, const struct sieve_extension *var_ext,
+	const struct sieve_extension *ext,
+	const struct sieve_variables_namespace_def *nspc_def)
+{
+	i_assert( sieve_extension_is(var_ext, variables_extension) );
+	sieve_operand_emit(sblock, var_ext, &namespace_variable_operand);
+	sieve_opr_object_emit(sblock, ext, &nspc_def->obj_def);
+}
+
+static bool opr_namespace_variable_dump
+(const struct sieve_dumptime_env *denv, const struct sieve_operand *oprnd,
+	sieve_size_t *address)
+{
+	struct sieve_variables_namespace nspc;
+	struct sieve_operand nsoprnd;
+
+	if ( !sieve_operand_read(denv->sblock, address, NULL, &nsoprnd) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_opr_object_read_data
+		(denv->sblock, &nsoprnd, &sieve_variables_namespace_operand_class, address,
+			&nspc.object) ) {
+		return FALSE;
+  }
+
+	nspc.def = (const struct sieve_variables_namespace_def *) nspc.object.def;
+
+	if ( nspc.def == NULL || nspc.def->dump_variable == NULL )
+		return FALSE;
+
+	return nspc.def->dump_variable(denv, &nspc, oprnd, address);
+}
+
+static int opr_namespace_variable_read
+(const struct sieve_runtime_env *renv, const struct sieve_operand *oprnd,
+	sieve_size_t *address, string_t **str_r)
+{
+	struct sieve_variables_namespace nspc;
+
+	if ( !sieve_opr_object_read
+		(renv, &sieve_variables_namespace_operand_class, address, &nspc.object) ) {
+		sieve_runtime_trace_operand_error(renv, oprnd,
+			"variable namespace operand corrupt: failed to read");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	nspc.def = (const struct sieve_variables_namespace_def *) nspc.object.def;
+
+	if ( nspc.def == NULL || nspc.def->read_variable == NULL )
+		return SIEVE_EXEC_FAILURE;
+
+	return nspc.def->read_variable(renv, &nspc, oprnd, address, str_r);
+}
+
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-namespaces.h b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-namespaces.h
new file mode 100644
index 0000000..a687582
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-namespaces.h
@@ -0,0 +1,43 @@
+#ifndef EXT_VARIABLES_NAMESPACES_H
+#define EXT_VARIABLES_NAMESPACES_H
+
+#include "sieve-common.h"
+
+#include "ext-variables-common.h"
+#include "sieve-ext-variables.h"
+
+/*
+ * Namespace registry
+ */
+
+bool ext_variables_namespace_exists
+	(const struct sieve_extension *var_ext, struct sieve_validator *valdtr,
+		const char *identifier);
+const struct sieve_variables_namespace *ext_variables_namespace_create_instance
+	(const struct sieve_extension *var_ext, struct sieve_validator *valdtr,
+		struct sieve_command *cmd, const char *identifier);
+
+void ext_variables_register_core_namespaces
+	(const struct sieve_extension *var_ext,
+		struct ext_variables_validator_context *ctx);
+
+/*
+ * Namespace argument
+ */
+
+struct sieve_ast_argument *ext_variables_namespace_argument_create
+	(const struct sieve_extension *this_ext,
+		struct sieve_validator *valdtr, struct sieve_ast_argument *parent_arg,
+		struct sieve_command *cmd, ARRAY_TYPE(sieve_variable_name) *var_name);
+bool ext_variables_namespace_argument_activate
+	(const struct sieve_extension *this_ext, struct sieve_validator *valdtr,
+		struct sieve_ast_argument *arg, struct sieve_command *cmd,
+		ARRAY_TYPE(sieve_variable_name) *var_name, bool assignment);
+
+/*
+ * Namespace operand
+ */
+
+extern const struct sieve_operand_def namespace_variable_operand;
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-operands.c b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-operands.c
new file mode 100644
index 0000000..359f3bf
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-operands.c
@@ -0,0 +1,279 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "hash.h"
+#include "str.h"
+#include "array.h"
+
+#include "sieve-common.h"
+#include "sieve-extensions.h"
+#include "sieve-ast.h"
+#include "sieve-binary.h"
+#include "sieve-code.h"
+#include "sieve-match-types.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-dump.h"
+#include "sieve-interpreter.h"
+
+#include "ext-variables-common.h"
+#include "ext-variables-limits.h"
+#include "ext-variables-name.h"
+#include "ext-variables-dump.h"
+#include "ext-variables-operands.h"
+
+/*
+ * Variable operand
+ */
+
+static bool opr_variable_dump
+	(const struct sieve_dumptime_env *denv, const struct sieve_operand *oprnd,
+		sieve_size_t *address);
+static int opr_variable_read_value
+	(const struct sieve_runtime_env *renv, const struct sieve_operand *oprnd,
+		sieve_size_t *address, string_t **str_r);
+
+const struct sieve_opr_string_interface variable_interface = {
+	opr_variable_dump,
+	opr_variable_read_value
+};
+
+const struct sieve_operand_def variable_operand = {
+	.name = "variable",
+	.ext_def = &variables_extension,
+	.code = EXT_VARIABLES_OPERAND_VARIABLE,
+	.class = &string_class,
+	.interface = &variable_interface
+};
+
+void sieve_variables_opr_variable_emit
+(struct sieve_binary_block *sblock, const struct sieve_extension *var_ext,
+	struct sieve_variable *var)
+{
+	i_assert( sieve_extension_is(var_ext, variables_extension) );
+
+	if ( var->ext == NULL ) {
+		/* Default variable storage */
+		(void) sieve_operand_emit(sblock, var_ext, &variable_operand);
+		(void) sieve_binary_emit_byte(sblock, 0); /* Default */
+		(void) sieve_binary_emit_unsigned(sblock, var->index);
+		return;
+	}
+
+	(void) sieve_operand_emit(sblock, var_ext, &variable_operand);
+	(void) sieve_binary_emit_extension(sblock, var->ext, 1); /* Extension */
+	(void) sieve_binary_emit_unsigned(sblock, var->index);
+}
+
+static bool opr_variable_dump
+(const struct sieve_dumptime_env *denv, const struct sieve_operand *oprnd,
+	sieve_size_t *address)
+{
+	const struct sieve_extension *this_ext = oprnd->ext;
+	unsigned int index = 0;
+	const struct sieve_extension *ext;
+	unsigned int code = 1; /* Initially set to offset value */
+	const char *identifier;
+
+	if ( !sieve_binary_read_extension(denv->sblock, address, &code, &ext) )
+		return FALSE;
+
+	if ( !sieve_binary_read_unsigned(denv->sblock, address, &index) )
+		return FALSE;
+
+	identifier = ext_variables_dump_get_identifier(this_ext, denv, ext, index);
+	identifier = identifier == NULL ? "??" : identifier;
+
+	if ( oprnd->field_name != NULL )
+		sieve_code_dumpf(denv, "%s: VAR[%s] ${%s}",
+			oprnd->field_name, sieve_ext_variables_get_varid(ext, index), identifier);
+	else
+		sieve_code_dumpf(denv, "VAR[%s] ${%s}",
+			sieve_ext_variables_get_varid(ext, index), identifier);
+
+	return TRUE;
+}
+
+static int opr_variable_read_value
+(const struct sieve_runtime_env *renv, const struct sieve_operand *oprnd,
+	sieve_size_t *address, string_t **str_r)
+{
+	const struct sieve_extension *this_ext = oprnd->ext;
+	const struct sieve_extension *ext;
+	unsigned int code = 1; /* Initially set to offset value */
+	struct sieve_variable_storage *storage;
+	unsigned int index = 0;
+
+	if ( !sieve_binary_read_extension(renv->sblock, address, &code, &ext) ) {
+		sieve_runtime_trace_operand_error(renv, oprnd,
+			"variable operand corrupt: invalid extension byte");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	storage = sieve_ext_variables_runtime_get_storage
+		(this_ext, renv, ext);
+	if ( storage == NULL ) {
+		sieve_runtime_trace_operand_error(renv, oprnd,
+			"variable operand corrupt: extension has no storage");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	if ( sieve_binary_read_unsigned(renv->sblock, address, &index) ) {
+		/* Parameter str can be NULL if we are requested to only skip and not
+		 * actually read the argument.
+		 */
+		if ( str_r != NULL ) {
+			if ( !sieve_variable_get(storage, index, str_r) )
+				return SIEVE_EXEC_FAILURE;
+
+			if ( *str_r == NULL ) *str_r = t_str_new(0);
+		}
+
+		return SIEVE_EXEC_OK;
+	}
+
+	sieve_runtime_trace_operand_error(renv, oprnd,
+		"variable operand corrupt: invalid variable index");
+	return SIEVE_EXEC_BIN_CORRUPT;
+}
+
+int sieve_variable_operand_read_data
+(const struct sieve_runtime_env *renv, struct sieve_operand *oprnd,
+	sieve_size_t *address, const char *field_name,
+	struct sieve_variable_storage **storage_r, unsigned int *var_index_r)
+{
+	const struct sieve_extension *ext;
+	unsigned int code = 1; /* Initially set to offset value */
+	unsigned int idx = 0;
+
+	oprnd->field_name = field_name;
+
+	if ( !sieve_operand_is_variable(oprnd) ) {
+		sieve_runtime_trace_operand_error(renv, oprnd,
+			"expected variable operand but found %s",	sieve_operand_name(oprnd));
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	if ( !sieve_binary_read_extension(renv->sblock, address, &code, &ext) ) {
+		sieve_runtime_trace_operand_error(renv, oprnd,
+			"variable operand corrupt: invalid extension byte");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	*storage_r = sieve_ext_variables_runtime_get_storage
+		(oprnd->ext, renv, ext);
+	if ( *storage_r == NULL )	{
+		sieve_runtime_trace_operand_error(renv, oprnd,
+			"variable operand corrupt: extension has no storage");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	if ( !sieve_binary_read_unsigned(renv->sblock, address, &idx) ) {
+		sieve_runtime_trace_operand_error(renv, oprnd,
+			"variable operand corrupt: invalid variable index");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	*var_index_r = idx;
+	return SIEVE_EXEC_OK;
+}
+
+int sieve_variable_operand_read
+(const struct sieve_runtime_env *renv, sieve_size_t *address,
+	const char *field_name, struct sieve_variable_storage **storage_r,
+	unsigned int *var_index_r)
+{
+	struct sieve_operand operand;
+	int ret;
+
+	if ( (ret=sieve_operand_runtime_read(renv, address, field_name, &operand))
+		<= 0)
+		return ret;
+
+	return sieve_variable_operand_read_data
+		(renv, &operand, address, field_name, storage_r, var_index_r);
+}
+
+/*
+ * Match value operand
+ */
+
+static bool opr_match_value_dump
+	(const struct sieve_dumptime_env *denv, const struct sieve_operand *oprnd,
+		sieve_size_t *address);
+static int opr_match_value_read
+	(const struct sieve_runtime_env *renv, const struct sieve_operand *oprnd,
+		sieve_size_t *address, string_t **str_r);
+
+const struct sieve_opr_string_interface match_value_interface = {
+	opr_match_value_dump,
+	opr_match_value_read
+};
+
+const struct sieve_operand_def match_value_operand = {
+	.name = "match-value",
+	.ext_def = &variables_extension,
+	.code = EXT_VARIABLES_OPERAND_MATCH_VALUE,
+	.class = &string_class,
+	.interface = &match_value_interface
+};
+
+void sieve_variables_opr_match_value_emit
+(struct sieve_binary_block *sblock, const struct sieve_extension *var_ext,
+	unsigned int index)
+{
+	i_assert( sieve_extension_is(var_ext, variables_extension) );
+	(void) sieve_operand_emit(sblock, var_ext, &match_value_operand);
+	(void) sieve_binary_emit_unsigned(sblock, index);
+}
+
+static bool opr_match_value_dump
+(const struct sieve_dumptime_env *denv,	const struct sieve_operand *oprnd,
+	sieve_size_t *address)
+{
+	unsigned int index = 0;
+
+	if (sieve_binary_read_unsigned(denv->sblock, address, &index) ) {
+		if ( oprnd->field_name != NULL )
+			sieve_code_dumpf
+				(denv, "%s: MATCHVAL %lu", oprnd->field_name, (unsigned long) index);
+		else
+			sieve_code_dumpf(denv, "MATCHVAL %lu", (unsigned long) index);
+
+		return TRUE;
+	}
+
+	return FALSE;
+}
+
+static int opr_match_value_read
+(const struct sieve_runtime_env *renv, const struct sieve_operand *oprnd,
+	sieve_size_t *address, string_t **str_r)
+{
+	const struct sieve_extension *this_ext = oprnd->ext;
+	const struct ext_variables_config *config =
+		ext_variables_get_config(this_ext);
+	unsigned int index = 0;
+
+	if ( sieve_binary_read_unsigned(renv->sblock, address, &index) ) {
+		/* Parameter str can be NULL if we are requested to only skip and not
+		 * actually read the argument.
+		 	*/
+		if ( str_r != NULL ) {
+			sieve_match_values_get(renv, index, str_r);
+
+			if ( *str_r == NULL )
+				*str_r = t_str_new(0);
+			else if ( str_len(*str_r) > config->max_variable_size )
+				str_truncate_utf8(*str_r, config->max_variable_size);
+		}
+
+		return SIEVE_EXEC_OK;
+	}
+
+	sieve_runtime_trace_operand_error(renv, oprnd,
+		"match value operand corrupt: invalid index data");
+	return SIEVE_EXEC_BIN_CORRUPT;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-operands.h b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-operands.h
new file mode 100644
index 0000000..64a7781
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables-operands.h
@@ -0,0 +1,37 @@
+#ifndef EXT_VARIABLES_OPERANDS_H
+#define EXT_VARIABLES_OPERANDS_H
+
+#include "lib.h"
+#include "hash.h"
+#include "str.h"
+#include "array.h"
+
+#include "sieve-common.h"
+#include "ext-variables-common.h"
+
+/*
+ * Variable operand
+ */
+
+extern const struct sieve_operand_def variable_operand;
+
+bool ext_variables_opr_variable_read
+	(const struct sieve_runtime_env *renv, sieve_size_t *address,
+		struct sieve_variable_storage **storage, unsigned int *var_index);
+
+/*
+ * Match value operand
+ */
+
+extern const struct sieve_operand_def match_value_operand;
+
+/*
+ * Variable string operand
+ */
+
+void ext_variables_opr_variable_string_emit
+	(struct sieve_binary *sbin, unsigned int elements);
+
+
+#endif
+
diff --git a/pigeonhole/src/lib-sieve/plugins/variables/ext-variables.c b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables.c
new file mode 100644
index 0000000..6bdef58
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/ext-variables.c
@@ -0,0 +1,84 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension variables
+ * -------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 5229
+ * Implementation: full
+ * Status: testing
+ *
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "unichar.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-binary.h"
+#include "sieve-interpreter.h"
+
+#include "sieve-validator.h"
+
+#include "ext-variables-common.h"
+#include "ext-variables-arguments.h"
+#include "ext-variables-operands.h"
+#include "ext-variables-namespaces.h"
+#include "ext-variables-modifiers.h"
+#include "ext-variables-dump.h"
+
+/*
+ * Operations
+ */
+
+const struct sieve_operation_def *ext_variables_operations[] = {
+	&cmd_set_operation,
+	&tst_string_operation
+};
+
+/*
+ * Operands
+ */
+
+const struct sieve_operand_def *ext_variables_operands[] = {
+	&variable_operand,
+	&match_value_operand,
+	&namespace_variable_operand,
+	&modifier_operand
+};
+
+/*
+ * Extension
+ */
+
+static bool ext_variables_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *validator);
+
+const struct sieve_extension_def variables_extension = {
+	.name = "variables",
+	.load = ext_variables_load,
+	.unload = ext_variables_unload,
+	.validator_load = ext_variables_validator_load,
+	.generator_load = ext_variables_generator_load,
+	.interpreter_load = ext_variables_interpreter_load,
+	.code_dump = ext_variables_code_dump,
+	SIEVE_EXT_DEFINE_OPERATIONS(ext_variables_operations),
+	SIEVE_EXT_DEFINE_OPERANDS(ext_variables_operands)
+};
+
+static bool ext_variables_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *validator)
+{
+	sieve_validator_argument_override
+		(validator, SAT_VAR_STRING, ext, &variable_string_argument);
+
+	sieve_validator_register_command(validator, ext, &cmd_set);
+	sieve_validator_register_command(validator, ext, &tst_string);
+
+	ext_variables_validator_initialize(ext, validator);
+
+	return TRUE;
+}
+
diff --git a/pigeonhole/src/lib-sieve/plugins/variables/sieve-ext-variables.h b/pigeonhole/src/lib-sieve/plugins/variables/sieve-ext-variables.h
new file mode 100644
index 0000000..ce0d0bc
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/sieve-ext-variables.h
@@ -0,0 +1,364 @@
+#ifndef SIEVE_EXT_VARIABLES_H
+#define SIEVE_EXT_VARIABLES_H
+
+#include "lib.h"
+
+#include "sieve-common.h"
+#include "sieve-extensions.h"
+#include "sieve-objects.h"
+#include "sieve-code.h"
+
+/* Public interface for other extensions to use
+ */
+
+/*
+ * Limits
+ */
+
+unsigned int
+sieve_variables_get_max_scope_size(const struct sieve_extension *var_ext);
+size_t
+sieve_variables_get_max_variable_size(const struct sieve_extension *var_ext);
+
+/*
+ * Variable extension
+ */
+
+/* FIXME: this is not suitable for future plugin support */
+
+extern const struct sieve_extension_def variables_extension;
+
+static inline const struct sieve_extension *sieve_ext_variables_get_extension
+(struct sieve_instance *svinst)
+{
+	return sieve_extension_register(svinst, &variables_extension, FALSE);
+}
+
+/*
+ * Variable name
+ */
+
+struct sieve_variable_name {
+	string_t *identifier;
+	int num_variable;
+};
+
+ARRAY_DEFINE_TYPE(sieve_variable_name, struct sieve_variable_name);
+
+bool sieve_variable_identifier_is_valid(const char *identifier);
+
+/*
+ * Variable scope
+ */
+
+struct sieve_variable {
+	const char *identifier;
+	unsigned int index;
+
+	const struct sieve_extension *ext;
+	void *context;
+};
+
+struct sieve_variable_scope;
+
+struct sieve_variable_scope *sieve_variable_scope_create
+	(struct sieve_instance *svinst, const struct sieve_extension *var_ext,
+		const struct sieve_extension *ext);
+void sieve_variable_scope_ref
+	(struct sieve_variable_scope *scope);
+void sieve_variable_scope_unref
+	(struct sieve_variable_scope **scope);
+pool_t sieve_variable_scope_pool
+	(struct sieve_variable_scope *scope);
+
+struct sieve_variable *sieve_variable_scope_declare
+	(struct sieve_variable_scope *scope, const char *identifier);
+struct sieve_variable *sieve_variable_scope_import
+	(struct sieve_variable_scope *scope, struct sieve_variable *var);
+struct sieve_variable *sieve_variable_scope_get_variable
+	(struct sieve_variable_scope *scope, const char *identifier);
+struct sieve_variable *sieve_variable_scope_get_indexed
+	(struct sieve_variable_scope *scope, unsigned int index);
+
+/* Binary */
+
+struct sieve_variable_scope_binary *sieve_variable_scope_binary_create
+	(struct sieve_variable_scope *scope);
+
+void sieve_variable_scope_binary_ref
+	(struct sieve_variable_scope_binary *scpbin);
+void sieve_variable_scope_binary_unref
+	(struct sieve_variable_scope_binary **scpbin);
+
+struct sieve_variable_scope *sieve_variable_scope_binary_dump
+	(struct sieve_instance *svinst,
+		const struct sieve_extension *var_ext,
+		const struct sieve_extension *ext,
+		const struct sieve_dumptime_env *denv, sieve_size_t *address);
+struct sieve_variable_scope_binary *sieve_variable_scope_binary_read
+	(struct sieve_instance *svinst,
+		const struct sieve_extension *var_ext,
+		const struct sieve_extension *ext,
+		struct sieve_binary_block *sblock, sieve_size_t *address);
+
+struct sieve_variable_scope *sieve_variable_scope_binary_get
+	(struct sieve_variable_scope_binary *scpbin);
+unsigned int sieve_variable_scope_binary_get_size
+	(struct sieve_variable_scope_binary *scpbin);
+
+/*
+ * Variable namespaces
+ */
+
+struct sieve_variables_namespace;
+
+struct sieve_variables_namespace_def {
+	struct sieve_object_def obj_def;
+
+	bool (*validate)
+		(struct sieve_validator *valdtr,
+			const struct sieve_variables_namespace *nspc,
+			struct sieve_ast_argument *arg, struct sieve_command *cmd,
+			ARRAY_TYPE(sieve_variable_name) *var_name, void **var_data,
+			bool assignment);
+	bool (*generate)
+		(const struct sieve_codegen_env *cgenv,
+			const struct sieve_variables_namespace *nspc,
+			struct sieve_ast_argument *arg, struct sieve_command *cmd,
+			void *var_data);
+
+	bool (*dump_variable)
+		(const struct sieve_dumptime_env *denv,
+			const struct sieve_variables_namespace *nspc,
+			const struct sieve_operand *oprnd, sieve_size_t *address);
+	int (*read_variable)
+		(const struct sieve_runtime_env *renv,
+			const struct sieve_variables_namespace *nspc,
+			const struct sieve_operand *oprnd, sieve_size_t *address, string_t **str);
+};
+
+#define SIEVE_VARIABLES_DEFINE_NAMESPACE(OP) SIEVE_EXT_DEFINE_OBJECT(OP)
+#define SIEVE_VARIABLES_DEFINE_NAMESPACES(OPS) SIEVE_EXT_DEFINE_OBJECTS(OPS)
+
+struct sieve_variables_namespace {
+	struct sieve_object object;
+
+	const struct sieve_variables_namespace_def *def;
+};
+
+void sieve_variables_namespace_register
+(const struct sieve_extension *var_ext, struct sieve_validator *valdtr,
+	const struct sieve_extension *ext,
+	const struct sieve_variables_namespace_def *nspc_def);
+
+extern const struct sieve_operand_class sieve_variables_namespace_operand_class;
+
+void sieve_variables_opr_namespace_variable_emit
+	(struct sieve_binary_block *sblock, const struct sieve_extension *var_ext,
+    const struct sieve_extension *ext,
+    const struct sieve_variables_namespace_def *nspc_def);
+
+/* Iteration over all declared variables */
+
+struct sieve_variable_scope_iter;
+
+struct sieve_variable_scope_iter *sieve_variable_scope_iterate_init
+	(struct sieve_variable_scope *scope);
+bool sieve_variable_scope_iterate
+	(struct sieve_variable_scope_iter *iter, struct sieve_variable **var_r);
+void sieve_variable_scope_iterate_deinit
+	(struct sieve_variable_scope_iter **iter);
+
+/* Statistics */
+
+unsigned int sieve_variable_scope_declarations
+	(struct sieve_variable_scope *scope);
+unsigned int sieve_variable_scope_size
+	(struct sieve_variable_scope *scope);
+
+/* Get all native variables */
+
+struct sieve_variable * const *sieve_variable_scope_get_variables
+	(struct sieve_variable_scope *scope, unsigned int *size_r);
+
+/*
+ * Variable storage
+ */
+
+struct sieve_variable_storage;
+
+struct sieve_variable_storage *sieve_variable_storage_create
+	(const struct sieve_extension *var_ext, pool_t pool,
+		struct sieve_variable_scope_binary *scpbin);
+bool sieve_variable_get
+	(struct sieve_variable_storage *storage, unsigned int index,
+		string_t **value);
+bool sieve_variable_get_modifiable
+	(struct sieve_variable_storage *storage, unsigned int index,
+		string_t **value);
+bool sieve_variable_assign
+	(struct sieve_variable_storage *storage, unsigned int index,
+		const string_t *value);
+bool sieve_variable_assign_cstr
+	(struct sieve_variable_storage *storage, unsigned int index,
+		const char *value);
+bool sieve_variable_get_identifier
+	(struct sieve_variable_storage *storage, unsigned int index,
+		const char **identifier);
+const char *sieve_variable_get_varid
+	(struct sieve_variable_storage *storage, unsigned int index);
+
+/*
+ * Variables access
+ */
+
+bool sieve_ext_variables_is_active
+	(const struct sieve_extension *var_ext, struct sieve_validator *valdtr);
+
+struct sieve_variable_scope *sieve_ext_variables_get_local_scope
+	(const struct sieve_extension *var_ext, struct sieve_validator *valdtr);
+
+/* Runtime */
+
+static inline const char *sieve_ext_variables_get_varid
+(const struct sieve_extension *ext, unsigned int index)
+{
+	if ( ext == NULL )
+		return t_strdup_printf("%ld", (long) index);
+
+	return t_strdup_printf("%s:%ld", sieve_extension_name(ext), (long) index);
+}
+
+struct sieve_variable_storage *sieve_ext_variables_runtime_get_storage
+	(const struct sieve_extension *var_ext, const struct sieve_runtime_env *renv,
+		const struct sieve_extension *ext);
+void sieve_ext_variables_runtime_set_storage
+	(const struct sieve_extension *var_ext, const struct sieve_runtime_env *renv,
+		const struct sieve_extension *ext, struct sieve_variable_storage *storage);
+
+const char *sieve_ext_variables_runtime_get_identifier
+(const struct sieve_extension *var_ext, const struct sieve_runtime_env *renv,
+	const struct sieve_extension *ext, unsigned int index);
+
+/*
+ * Variable arguments
+ */
+
+bool sieve_variable_argument_activate
+	(const struct sieve_extension *var_ext,
+		const struct sieve_extension *this_ext,
+		struct sieve_validator *valdtr, struct sieve_command *cmd,
+		struct sieve_ast_argument *arg, bool assignment);
+
+/*
+ * Variable operands
+ */
+
+extern const struct sieve_operand_def variable_operand;
+
+void sieve_variables_opr_variable_emit
+	(struct sieve_binary_block *sblock, const struct sieve_extension *var_ext,
+		struct sieve_variable *var);
+void sieve_variables_opr_match_value_emit
+	(struct sieve_binary_block *sblock, const struct sieve_extension *var_ext,
+		unsigned int index);
+
+int sieve_variable_operand_read_data
+	(const struct sieve_runtime_env *renv, struct sieve_operand *operand,
+		sieve_size_t *address, const char *field_name,
+		struct sieve_variable_storage **storage_r, unsigned int *var_index_r);
+int sieve_variable_operand_read
+	(const struct sieve_runtime_env *renv, sieve_size_t *address,
+		const char *field_name, struct sieve_variable_storage **storage_r,
+		unsigned int *var_index_r);
+
+static inline bool sieve_operand_is_variable
+(const struct sieve_operand *operand)
+{
+	return ( operand != NULL && operand->def != NULL &&
+		operand->def == &variable_operand );
+}
+
+/*
+ * Modifiers
+ */
+
+/* Definition */
+
+struct sieve_variables_modifier;
+
+struct sieve_variables_modifier_def {
+	struct sieve_object_def obj_def;
+
+	unsigned int precedence;
+
+	bool (*modify)(const struct sieve_variables_modifier *modf,
+		       string_t *in, string_t **result);
+};
+
+struct sieve_variables_modifier {
+	struct sieve_object object;
+	const struct sieve_extension *var_ext;
+
+	const struct sieve_variables_modifier_def *def;
+};
+
+#define SIEVE_VARIABLES_DEFINE_MODIFIER(OP) SIEVE_EXT_DEFINE_OBJECT(OP)
+#define SIEVE_VARIABLES_DEFINE_MODIFIERS(OPS) SIEVE_EXT_DEFINE_OBJECTS(OPS)
+
+#define sieve_variables_modifier_name(smodf) \
+	( (smodf)->object.def->identifier )
+
+ARRAY_DEFINE_TYPE(sieve_variables_modifier,
+	struct sieve_variables_modifier);
+
+/* Registry */
+
+void sieve_variables_modifier_register
+	(const struct sieve_extension *var_ext, struct sieve_validator *valdtr,
+		const struct sieve_extension *ext,
+		const struct sieve_variables_modifier_def *smodf);
+
+/* Tagged argument */
+
+void sieve_variables_modifiers_link_tag
+	(struct sieve_validator *valdtr, const struct sieve_extension *var_ext,
+		struct sieve_command_registration *cmd_reg);
+
+bool sieve_variables_modifiers_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd,
+		ARRAY_TYPE(sieve_variables_modifier) *modifiers);
+
+bool sieve_variables_modifiers_generate
+	(const struct sieve_codegen_env *cgenv,
+		ARRAY_TYPE(sieve_variables_modifier) *modifiers);
+
+/* Coding */
+
+extern const struct sieve_operand_class
+	sieve_variables_modifier_operand_class;
+
+bool sieve_variables_modifiers_code_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+int sieve_variables_modifiers_code_read(
+	const struct sieve_runtime_env *renv,
+	const struct sieve_extension *var_ext, sieve_size_t *address,
+	ARRAY_TYPE(sieve_variables_modifier) *modifiers);
+
+/* Application */
+
+int sieve_variables_modifiers_apply
+(const struct sieve_runtime_env *renv,
+	const struct sieve_extension *var_ext,
+	ARRAY_TYPE(sieve_variables_modifier) *modifiers,
+	string_t **value);
+
+/*
+ * Code dumping
+ */
+
+void sieve_ext_variables_dump_set_scope
+(const struct sieve_extension *var_ext, const struct sieve_dumptime_env *denv,
+	const struct sieve_extension *ext, struct sieve_variable_scope *scope);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/variables/tst-string.c b/pigeonhole/src/lib-sieve/plugins/variables/tst-string.c
new file mode 100644
index 0000000..91b0b82
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/variables/tst-string.c
@@ -0,0 +1,271 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-match.h"
+
+#include "ext-variables-common.h"
+
+/*
+ * String test
+ *
+ * Syntax:
+ *   string [COMPARATOR] [MATCH-TYPE]
+ *     <source: string-list> <key-list: string-list>
+ */
+
+static bool tst_string_registered
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+static bool tst_string_validate
+	(struct sieve_validator *valdtr, struct sieve_command *tst);
+static bool tst_string_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx);
+
+const struct sieve_command_def tst_string = {
+	.identifier = "string",
+	.type = SCT_TEST,
+	.positional_args = 2,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = tst_string_registered,
+	.validate = tst_string_validate,
+	.generate = tst_string_generate
+};
+
+/*
+ * String operation
+ */
+
+static bool tst_string_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int tst_string_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def tst_string_operation = {
+	.mnemonic = "STRING",
+	.ext_def = &variables_extension,
+	.code = EXT_VARIABLES_OPERATION_STRING,
+	.dump = tst_string_operation_dump,
+	.execute = tst_string_operation_execute
+};
+
+/*
+ * Optional arguments
+ */
+
+enum tst_string_optional {
+	OPT_END,
+	OPT_COMPARATOR,
+	OPT_MATCH_TYPE
+};
+
+/*
+ * Test registration
+ */
+
+static bool tst_string_registered
+(struct sieve_validator *valdtr, const struct sieve_extension *ext ATTR_UNUSED,
+	struct sieve_command_registration *cmd_reg)
+{
+	/* The order of these is not significant */
+	sieve_comparators_link_tag(valdtr, cmd_reg, OPT_COMPARATOR);
+	sieve_match_types_link_tags(valdtr, cmd_reg, OPT_MATCH_TYPE);
+
+	return TRUE;
+}
+
+/*
+ * Test validation
+ */
+
+static bool tst_string_validate
+(struct sieve_validator *valdtr, struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+	const struct sieve_match_type mcht_default =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	const struct sieve_comparator cmp_default =
+		SIEVE_COMPARATOR_DEFAULT(i_octet_comparator);
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "source", 1, SAAT_STRING_LIST) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, tst, arg, FALSE) )
+		return FALSE;
+
+	arg = sieve_ast_argument_next(arg);
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "key list", 2, SAAT_STRING_LIST) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, tst, arg, FALSE) )
+		return FALSE;
+
+	/* Validate the key argument to a specified match type */
+	return sieve_match_type_validate
+		(valdtr, tst, arg, &mcht_default, &cmp_default);
+}
+
+/*
+ * Test generation
+ */
+
+static bool tst_string_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &tst_string_operation);
+
+ 	/* Generate arguments */
+	if ( !sieve_generate_arguments(cgenv, cmd, NULL) )
+		return FALSE;
+
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool tst_string_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "STRING-TEST");
+	sieve_code_descend(denv);
+
+	/* Optional operands */
+	if ( sieve_match_opr_optional_dump(denv, address, NULL) != 0 )
+		return FALSE;
+
+	return
+		sieve_opr_stringlist_dump(denv, address, "source") &&
+		sieve_opr_stringlist_dump(denv, address, "key list");
+}
+
+/*
+ * Code execution
+ */
+
+static int tst_string_stringlist_next_item
+	(struct sieve_stringlist *_strlist, string_t **str_r);
+static void tst_string_stringlist_reset
+	(struct sieve_stringlist *_strlist);
+static int tst_string_stringlist_get_length
+	(struct sieve_stringlist *_strlist);
+
+struct tst_string_stringlist {
+	struct sieve_stringlist strlist;
+
+	struct sieve_stringlist *value_list;
+};
+
+static struct sieve_stringlist *tst_string_stringlist_create
+(const struct sieve_runtime_env *renv, struct sieve_stringlist *value_list)
+{
+	struct tst_string_stringlist *strlist;
+
+	strlist = t_new(struct tst_string_stringlist, 1);
+	strlist->strlist.runenv = renv;
+	strlist->strlist.exec_status = SIEVE_EXEC_OK;
+	strlist->strlist.next_item = tst_string_stringlist_next_item;
+	strlist->strlist.reset = tst_string_stringlist_reset;
+	strlist->strlist.get_length = tst_string_stringlist_get_length;
+	strlist->value_list = value_list;
+
+	return &strlist->strlist;
+}
+
+static int tst_string_stringlist_next_item
+(struct sieve_stringlist *_strlist, string_t **str_r)
+{
+	struct tst_string_stringlist *strlist =
+		(struct tst_string_stringlist *)_strlist;
+
+	return sieve_stringlist_next_item(strlist->value_list, str_r);
+}
+
+static void tst_string_stringlist_reset
+(struct sieve_stringlist *_strlist)
+{
+	struct tst_string_stringlist *strlist =
+		(struct tst_string_stringlist *)_strlist;
+
+	sieve_stringlist_reset(strlist->value_list);
+}
+
+static int tst_string_stringlist_get_length
+(struct sieve_stringlist *_strlist)
+{
+	struct tst_string_stringlist *strlist =
+		(struct tst_string_stringlist *)_strlist;
+	string_t *item;
+	int length = 0;
+	int ret;
+
+	while ( (ret=sieve_stringlist_next_item(strlist->value_list, &item)) > 0 ) {
+		if ( str_len(item) > 0 )
+			length++;
+	}
+
+	return ( ret < 0 ? -1 : length );
+}
+
+static int tst_string_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	struct sieve_match_type mcht =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	struct sieve_comparator cmp =
+		SIEVE_COMPARATOR_DEFAULT(i_octet_comparator);
+	struct sieve_stringlist *source, *value_list, *key_list;
+	int match, ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Handle match-type and comparator operands */
+	if ( sieve_match_opr_optional_read
+		(renv, address, NULL, &ret, &cmp, &mcht) < 0 )
+		return ret;
+
+	/* Read source */
+	if ( (ret=sieve_opr_stringlist_read(renv, address, "source", &source)) <= 0 )
+		return ret;
+
+	/* Read key-list */
+	if ( (ret=sieve_opr_stringlist_read(renv, address, "key-list", &key_list))
+		<= 0 )
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS, "string test");
+
+	/* Create wrapper string list wich does not count empty string items */
+	value_list = tst_string_stringlist_create(renv, source);
+
+	/* Perform match */
+	if ( (match=sieve_match(renv, &mcht, &cmp, value_list, key_list, &ret)) < 0 )
+		return ret;
+
+	/* Set test result for subsequent conditional jump */
+	sieve_interpreter_set_test_result(renv->interp, match > 0);
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/Makefile.am b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/Makefile.am
new file mode 100644
index 0000000..f409e2b
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/Makefile.am
@@ -0,0 +1,2 @@
+SUBDIRS = debug environment report
+
diff --git a/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/Makefile.in b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/Makefile.in
new file mode 100644
index 0000000..43680f1
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/Makefile.in
@@ -0,0 +1,692 @@
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diff --git a/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/debug/Makefile.am b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/debug/Makefile.am
new file mode 100644
index 0000000..1e08946
--- /dev/null
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diff --git a/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/debug/Makefile.in b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/debug/Makefile.in
new file mode 100644
index 0000000..f9b5450
--- /dev/null
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+
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+	-rm -rf .libs _libs
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+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
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+	shift; \
+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$unique" || unique=$$empty_fix; \
+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
+ctags: ctags-am
+
+CTAGS: ctags
+ctags-am: $(TAGS_DEPENDENCIES) $(am__tagged_files)
+	$(am__define_uniq_tagged_files); \
+	test -z "$(CTAGS_ARGS)$$unique" \
+	  || $(CTAGS) $(CTAGSFLAGS) $(AM_CTAGSFLAGS) $(CTAGS_ARGS) \
+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
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+
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+	list='$(am__tagged_files)'; \
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+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
+	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
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+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(LTLIBRARIES) $(HEADERS)
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+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
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+	fi
+mostlyclean-generic:
+
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+
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+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
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+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
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+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	mostlyclean-am
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+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/cmd-debug-log.Plo
+	-rm -f ./$(DEPDIR)/ext-debug.Plo
+	-rm -f Makefile
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+	distclean-tags
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+		-rm -f ./$(DEPDIR)/cmd-debug-log.Plo
+	-rm -f ./$(DEPDIR)/ext-debug.Plo
+	-rm -f Makefile
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+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/debug/cmd-debug-log.c b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/debug/cmd-debug-log.c
new file mode 100644
index 0000000..355daa5
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/debug/cmd-debug-log.c
@@ -0,0 +1,130 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-binary.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "ext-debug-common.h"
+
+/*
+ * Debug_log command
+ *
+ * Syntax
+ *   debug_log <message: string>
+ */
+
+static bool cmd_debug_log_validate
+	(struct sieve_validator *valdtr, struct sieve_command *tst);
+static bool cmd_debug_log_generate
+	(const struct sieve_codegen_env *cgenv,	struct sieve_command *ctx);
+
+const struct sieve_command_def debug_log_command = {
+	.identifier = "debug_log",
+	.type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = cmd_debug_log_validate,
+	.generate = cmd_debug_log_generate
+};
+
+/*
+ * Body operation
+ */
+
+static bool cmd_debug_log_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int cmd_debug_log_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def debug_log_operation = {
+	.mnemonic = "DEBUG_LOG",
+	.ext_def = &vnd_debug_extension,
+	.dump = cmd_debug_log_operation_dump,
+	.execute = cmd_debug_log_operation_execute
+};
+
+/*
+ * Validation
+ */
+
+static bool cmd_debug_log_validate
+(struct sieve_validator *valdtr, struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "message", 1, SAAT_STRING) ) {
+		return FALSE;
+	}
+
+	return sieve_validator_argument_activate(valdtr, tst, arg, FALSE);
+}
+
+/*
+ * Code generation
+ */
+
+static bool cmd_debug_log_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	(void)sieve_operation_emit(cgenv->sblock, cmd->ext, &debug_log_operation);
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, cmd, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool cmd_debug_log_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "DEBUG_LOG");
+	sieve_code_descend(denv);
+
+	return sieve_opr_string_dump(denv, address, "key list");
+}
+
+/*
+ * Interpretation
+ */
+
+static int cmd_debug_log_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	string_t *message;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Read message */
+
+	if ( (ret=sieve_opr_string_read(renv, address, "message", &message)) <= 0 )
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS, "debug_log \"%s\"",
+		str_sanitize(str_c(message), 80));
+
+	sieve_runtime_log(renv, NULL, "DEBUG: %s", str_c(message));
+
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/debug/ext-debug-common.h b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/debug/ext-debug-common.h
new file mode 100644
index 0000000..88ae3db
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/debug/ext-debug-common.h
@@ -0,0 +1,22 @@
+#ifndef EXT_DEBUG_COMMON_H
+#define EXT_DEBUG_COMMON_H
+
+/*
+ * Extensions
+ */
+
+extern const struct sieve_extension_def vnd_debug_extension;
+
+/*
+ * Commands
+ */
+
+extern const struct sieve_command_def debug_log_command;
+
+/*
+ * Operations
+ */
+
+extern const struct sieve_operation_def debug_log_operation;
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/debug/ext-debug.c b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/debug/ext-debug.c
new file mode 100644
index 0000000..2781e83
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/debug/ext-debug.c
@@ -0,0 +1,70 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension debug
+ * ---------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: vendor-defined; spec-bosch-sieve-debug
+ * Implementation: full
+ * Status: experimental
+ *
+ */
+
+#include "lib.h"
+#include "array.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-address-parts.h"
+
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-binary.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "ext-debug-common.h"
+
+/*
+ * Extension
+ */
+
+static bool ext_debug_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *validator);
+static bool ext_debug_interpreter_load
+	(const struct sieve_extension *ext ATTR_UNUSED,
+		const struct sieve_runtime_env *renv, sieve_size_t *address ATTR_UNUSED);
+
+
+const struct sieve_extension_def vnd_debug_extension = {
+	.name = "vnd.dovecot.debug",
+	.validator_load = ext_debug_validator_load,
+	.interpreter_load = ext_debug_interpreter_load,
+	SIEVE_EXT_DEFINE_OPERATION(debug_log_operation),
+};
+
+static bool ext_debug_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *validator)
+{
+	/* Register new test */
+	sieve_validator_register_command(validator, ext, &debug_log_command);
+
+	return TRUE;
+}
+
+static bool ext_debug_interpreter_load
+(const struct sieve_extension *ext ATTR_UNUSED,
+	const struct sieve_runtime_env *renv, sieve_size_t *address ATTR_UNUSED)
+{
+	if ( renv->ehandler != NULL ) {
+		sieve_error_handler_accept_infolog(renv->ehandler, TRUE);
+	}
+
+	return TRUE;
+}
+
+
+
diff --git a/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/environment/Makefile.am b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/environment/Makefile.am
new file mode 100644
index 0000000..96618ff
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/environment/Makefile.am
@@ -0,0 +1,16 @@
+noinst_LTLIBRARIES = libsieve_ext_vnd_environment.la
+
+AM_CPPFLAGS = \
+	-I$(srcdir)/../../.. \
+	-I$(srcdir)/../../environment \
+	-I$(srcdir)/../../variables \
+	$(LIBDOVECOT_INCLUDE)
+
+libsieve_ext_vnd_environment_la_SOURCES = \
+	ext-vnd-environment.c \
+	ext-vnd-environment-items.c \
+	ext-vnd-environment-variables.c
+
+noinst_HEADERS = \
+	ext-vnd-environment-common.h
+
diff --git a/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/environment/Makefile.in b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/environment/Makefile.in
new file mode 100644
index 0000000..b5d8b20
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/environment/Makefile.in
@@ -0,0 +1,692 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+VPATH = @srcdir@
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+  if test -z '$(MAKELEVEL)'; then \
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+  elif test -n '$(MAKE_HOST)'; then \
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+}
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+am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
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+	$(am__DIST_COMMON)
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+CONFIG_HEADER = $(top_builddir)/dummy-config.h \
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+am_libsieve_ext_vnd_environment_la_OBJECTS = ext-vnd-environment.lo \
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+	$(am_libsieve_ext_vnd_environment_la_OBJECTS)
+AM_V_lt = $(am__v_lt_@AM_V@)
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+am__maybe_remake_depfiles = depfiles
+am__depfiles_remade = ./$(DEPDIR)/ext-vnd-environment-items.Plo \
+	./$(DEPDIR)/ext-vnd-environment-variables.Plo \
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+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/ext-vnd-environment-items.Plo
+	-rm -f ./$(DEPDIR)/ext-vnd-environment-variables.Plo
+	-rm -f ./$(DEPDIR)/ext-vnd-environment.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/environment/ext-vnd-environment-common.h b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/environment/ext-vnd-environment-common.h
new file mode 100644
index 0000000..980c830
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/environment/ext-vnd-environment-common.h
@@ -0,0 +1,37 @@
+#ifndef EXT_VND_ENVIRONMENT_COMMON_H
+#define EXT_VND_ENVIRONMENT_COMMON_H
+
+#include "sieve-ext-environment.h"
+
+/*
+ * Extension
+ */
+
+struct ext_vnd_environment_context {
+	const struct sieve_extension *env_ext;
+	const struct sieve_extension *var_ext;
+};
+
+extern const struct sieve_extension_def vnd_environment_extension;
+
+/*
+ * Operands
+ */
+
+extern const struct sieve_operand_def environment_namespace_operand;
+
+/*
+ * Environment items
+ */
+
+void ext_vnd_environment_items_register
+(const struct sieve_extension *ext, const struct sieve_runtime_env *renv);
+
+/*
+ * Variables
+ */
+
+void ext_environment_variables_init
+(const struct sieve_extension *this_ext, struct sieve_validator *valdtr);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/environment/ext-vnd-environment-items.c b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/environment/ext-vnd-environment-items.c
new file mode 100644
index 0000000..af03255
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/environment/ext-vnd-environment-items.c
@@ -0,0 +1,95 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "array.h"
+
+#include "sieve-settings.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-address-parts.h"
+
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-binary.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "ext-vnd-environment-common.h"
+
+/*
+ * Environment items
+ */
+
+/* default_mailbox */
+
+static const char *
+envit_default_mailbox_get_value(const struct sieve_runtime_env *renv,
+				const char *name ATTR_UNUSED)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+
+	i_assert(eenv->scriptenv->default_mailbox != NULL);
+	return eenv->scriptenv->default_mailbox;
+}
+
+const struct sieve_environment_item default_mailbox_env_item = {
+	.name = "vnd.dovecot.default-mailbox",
+	.get_value = envit_default_mailbox_get_value
+};
+
+/* username */
+
+static const char *
+envit_username_get_value(const struct sieve_runtime_env *renv,
+			 const char *name ATTR_UNUSED)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+
+	return eenv->svinst->username;
+}
+
+const struct sieve_environment_item username_env_item = {
+	.name = "vnd.dovecot.username",
+	.get_value = envit_username_get_value
+};
+
+/* config.* */
+
+static const char *
+envit_config_get_value(const struct sieve_runtime_env *renv, const char *name)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+
+	if (*name == '\0')
+		return NULL;
+
+	return sieve_setting_get(eenv->svinst,
+				 t_strconcat("sieve_env_", name, NULL));
+}
+
+const struct sieve_environment_item config_env_item = {
+	.name = "vnd.dovecot.config",
+	.prefix = TRUE,
+	.get_value = envit_config_get_value
+};
+
+/*
+ * Register
+ */
+
+void ext_vnd_environment_items_register(const struct sieve_extension *ext,
+					const struct sieve_runtime_env *renv)
+{
+	struct ext_vnd_environment_context *ectx =
+		(struct ext_vnd_environment_context *)ext->context;
+
+	sieve_environment_item_register(ectx->env_ext, renv->interp,
+					&default_mailbox_env_item);
+	sieve_environment_item_register(ectx->env_ext, renv->interp,
+					&username_env_item);
+	sieve_environment_item_register(ectx->env_ext, renv->interp,
+					&config_env_item);
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/environment/ext-vnd-environment-variables.c b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/environment/ext-vnd-environment-variables.c
new file mode 100644
index 0000000..1466ee7
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/environment/ext-vnd-environment-variables.c
@@ -0,0 +1,206 @@
+/* Copyright (c) 2015-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+
+#include "sieve-common.h"
+#include "sieve-ast.h"
+#include "sieve-binary.h"
+#include "sieve-code.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "sieve-ext-variables.h"
+
+#include "ext-vnd-environment-common.h"
+
+static bool vnspc_vnd_environment_validate
+	(struct sieve_validator *valdtr,
+		const struct sieve_variables_namespace *nspc,
+		struct sieve_ast_argument *arg, struct sieve_command *cmd,
+		ARRAY_TYPE(sieve_variable_name) *var_name, void **var_data,
+		bool assignment);
+static bool vnspc_vnd_environment_generate
+	(const struct sieve_codegen_env *cgenv,
+		const struct sieve_variables_namespace *nspc,
+		struct sieve_ast_argument *arg,
+		struct sieve_command *cmd, void *var_data);
+static bool vnspc_vnd_environment_dump_variable
+	(const struct sieve_dumptime_env *denv,
+		const struct sieve_variables_namespace *nspc, 
+		const struct sieve_operand *oprnd, sieve_size_t *address);
+static int vnspc_vnd_environment_read_variable
+	(const struct sieve_runtime_env *renv,
+		const struct sieve_variables_namespace *nspc,
+		const struct sieve_operand *oprnd,
+		sieve_size_t *address, string_t **str_r);
+
+static const struct sieve_variables_namespace_def
+environment_namespace = {
+	SIEVE_OBJECT("env", &environment_namespace_operand, 0),
+	.validate = vnspc_vnd_environment_validate,
+	.generate = vnspc_vnd_environment_generate,
+	.dump_variable = vnspc_vnd_environment_dump_variable,
+	.read_variable = vnspc_vnd_environment_read_variable
+};
+
+static bool vnspc_vnd_environment_validate
+(struct sieve_validator *valdtr, 
+	const struct sieve_variables_namespace *nspc ATTR_UNUSED,
+	struct sieve_ast_argument *arg, struct sieve_command *cmd ATTR_UNUSED,
+	ARRAY_TYPE(sieve_variable_name) *var_name, void **var_data,
+	bool assignment)
+{
+	struct sieve_ast *ast = arg->ast;
+	const struct sieve_variable_name *name_elements;
+	unsigned int i, count;
+	const char *variable;
+	string_t *name;
+
+	/* Compose environment name from parsed variable name */
+	name = t_str_new(64);
+	name_elements = array_get(var_name, &count);
+	i_assert(count > 1);
+	for (i = 1; i < count; i++) {
+		if ( name_elements[i].num_variable >= 0 ) {
+			sieve_argument_validate_error(valdtr, arg,
+				"vnd.dovecot.environment: invalid variable name within "
+				"env namespace `env.%d': "
+				"encountered numeric variable name",
+				name_elements[i].num_variable);
+			return FALSE;
+		}
+		if (str_len(name) > 0)
+			str_append_c(name, '.');
+		str_append_str(name, name_elements[i].identifier);
+	}
+
+	variable = str_c(name);
+
+	if ( assignment ) {
+		sieve_argument_validate_error(valdtr, arg,
+			"vnd.dovecot.environment: cannot assign to environment "
+			"variable `env.%s'", variable);
+		return FALSE;
+	}
+
+	*var_data = (void *) p_strdup(sieve_ast_pool(ast), variable);
+	return TRUE;
+}
+
+static bool vnspc_vnd_environment_generate
+(const struct sieve_codegen_env *cgenv,
+	const struct sieve_variables_namespace *nspc,
+	struct sieve_ast_argument *arg ATTR_UNUSED,
+	struct sieve_command *cmd ATTR_UNUSED, void *var_data)
+{
+	const struct sieve_extension *this_ext = SIEVE_OBJECT_EXTENSION(nspc);	
+	const char *variable = (const char *) var_data;
+	struct ext_vnd_environment_context *ext_data;
+
+	if ( this_ext == NULL )
+		return FALSE;
+
+	ext_data = (struct ext_vnd_environment_context *) this_ext->context;
+
+	sieve_variables_opr_namespace_variable_emit
+		(cgenv->sblock, ext_data->var_ext, this_ext, &environment_namespace);
+	sieve_binary_emit_cstring(cgenv->sblock, variable);
+
+	return TRUE;
+}
+
+static bool vnspc_vnd_environment_dump_variable
+(const struct sieve_dumptime_env *denv,
+	const struct sieve_variables_namespace *nspc ATTR_UNUSED,
+	const struct sieve_operand *oprnd, sieve_size_t *address)
+{
+	string_t *var_name;
+
+	if ( !sieve_binary_read_string(denv->sblock, address, &var_name) )
+		return FALSE;
+
+	if ( oprnd->field_name != NULL )
+		sieve_code_dumpf(denv, "%s: VAR ${env.%s}",
+			oprnd->field_name, str_c(var_name));
+	else
+		sieve_code_dumpf(denv, "VAR ${env.%s}",
+			str_c(var_name));
+
+	return TRUE;
+}
+
+static int vnspc_vnd_environment_read_variable
+(const struct sieve_runtime_env *renv,
+	const struct sieve_variables_namespace *nspc,
+	const struct sieve_operand *oprnd, sieve_size_t *address,
+	string_t **str_r)
+{
+	const struct sieve_extension *this_ext = SIEVE_OBJECT_EXTENSION(nspc);	
+	struct ext_vnd_environment_context *ectx =
+		(struct ext_vnd_environment_context *) this_ext->context;
+	string_t *var_name;
+	const char *ext_value;
+
+	if ( !sieve_binary_read_string(renv->sblock, address, &var_name) ) {
+		sieve_runtime_trace_operand_error(renv, oprnd,
+			"environment variable operand corrupt: invalid name");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	if ( str_r !=  NULL ) {
+		const char *vname = str_c(var_name);
+
+		ext_value = ext_environment_item_get_value
+			(ectx->env_ext, renv, vname);
+
+		if ( ext_value == NULL && strchr(vname, '_') != NULL) {
+			char *p, *aname;
+
+			/* Try again with '_' replaced with '-' */
+			aname = t_strdup_noconst(vname);
+			for (p = aname; *p != '\0'; p++) {
+				if (*p == '_')
+					*p = '-';
+			}
+			ext_value = ext_environment_item_get_value
+				(ectx->env_ext, renv, aname);
+		}
+
+		if ( ext_value == NULL ) {
+			*str_r = t_str_new_const("", 0);
+			return SIEVE_EXEC_OK;
+		}
+
+		*str_r = t_str_new_const(ext_value, strlen(ext_value));
+	}
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Namespace registration
+ */
+
+static const struct sieve_extension_objects environment_namespaces =
+	SIEVE_VARIABLES_DEFINE_NAMESPACE(environment_namespace);
+
+const struct sieve_operand_def environment_namespace_operand = {
+	.name = "env-namespace",
+	.ext_def = &vnd_environment_extension,
+	.class = &sieve_variables_namespace_operand_class,
+	.interface = &environment_namespaces
+};
+
+void ext_environment_variables_init
+(const struct sieve_extension *this_ext, struct sieve_validator *valdtr)
+{
+	struct ext_vnd_environment_context *ext_data =
+		(struct ext_vnd_environment_context *) this_ext->context;
+
+	sieve_variables_namespace_register
+		(ext_data->var_ext, valdtr, this_ext, &environment_namespace);
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/environment/ext-vnd-environment.c b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/environment/ext-vnd-environment.c
new file mode 100644
index 0000000..f8c7028
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/environment/ext-vnd-environment.c
@@ -0,0 +1,112 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension vnd.dovecot.environment
+ * ---------------------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: vendor-defined;
+ *   spec-bosch-sieve-dovecot-environment
+ * Implementation: preliminary
+ * Status: experimental
+ *
+ */
+
+#include "lib.h"
+#include "array.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-address-parts.h"
+
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-binary.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "sieve-ext-variables.h"
+
+#include "ext-vnd-environment-common.h"
+
+/*
+ * Extension
+ */
+
+static bool ext_vnd_environment_load
+	(const struct sieve_extension *ext, void **context);
+static void ext_vnd_environment_unload
+	(const struct sieve_extension *ext);
+static bool ext_vnd_environment_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+static bool ext_vnd_environment_interpreter_load
+	(const struct sieve_extension *ext, const struct sieve_runtime_env *renv,
+		sieve_size_t *address);
+
+const struct sieve_extension_def vnd_environment_extension = {
+	.name = "vnd.dovecot.environment",
+	.load = ext_vnd_environment_load,
+	.unload = ext_vnd_environment_unload,
+	.validator_load = ext_vnd_environment_validator_load,
+	.interpreter_load = ext_vnd_environment_interpreter_load,
+	SIEVE_EXT_DEFINE_OPERAND(environment_namespace_operand)
+};
+
+static bool ext_vnd_environment_load
+(const struct sieve_extension *ext, void **context)
+{
+	struct ext_vnd_environment_context *ectx;
+
+	if ( *context != NULL )
+		ext_vnd_environment_unload(ext);
+
+	ectx = i_new(struct ext_vnd_environment_context, 1);
+	ectx->env_ext = sieve_ext_environment_require_extension(ext->svinst);
+	ectx->var_ext = sieve_ext_variables_get_extension(ext->svinst);
+	*context = (void *) ectx;
+
+	return TRUE;
+}
+
+static void ext_vnd_environment_unload
+(const struct sieve_extension *ext)
+{
+	struct ext_vnd_environment_context *ectx =
+		(struct ext_vnd_environment_context *) ext->context;
+
+	i_free(ectx);
+}
+
+/*
+ * Validator
+ */
+
+static bool ext_vnd_environment_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	const struct sieve_extension *env_ext;
+
+	/* Load environment extension implicitly */
+
+	env_ext = sieve_validator_extension_load_implicit
+		(valdtr, environment_extension.name);
+	if ( env_ext == NULL )
+		return FALSE;
+
+	ext_environment_variables_init(ext, valdtr);
+	return TRUE;
+}
+
+/*
+ * Interpreter
+ */
+
+static bool ext_vnd_environment_interpreter_load
+(const struct sieve_extension *ext, const struct sieve_runtime_env *renv,
+	sieve_size_t *address ATTR_UNUSED)
+{
+	ext_vnd_environment_items_register(ext, renv);
+	return TRUE;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/report/Makefile.am b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/report/Makefile.am
new file mode 100644
index 0000000..599765f
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/report/Makefile.am
@@ -0,0 +1,17 @@
+noinst_LTLIBRARIES = libsieve_ext_vnd_report.la
+
+AM_CPPFLAGS = \
+	-I$(srcdir)/../../.. \
+	-I$(srcdir)/../../../util \
+	$(LIBDOVECOT_INCLUDE)
+
+commands = \
+	cmd-report.c
+
+libsieve_ext_vnd_report_la_SOURCES = \
+	ext-vnd-report.c \
+	ext-vnd-report-common.c \
+	$(commands)
+
+noinst_HEADERS = \
+	ext-vnd-report-common.h
diff --git a/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/report/Makefile.in b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/report/Makefile.in
new file mode 100644
index 0000000..1c2ec8c
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/report/Makefile.in
@@ -0,0 +1,695 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
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+}
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+      -[dEDm]) skip_next=yes;; \
+      -[JT]) skip_next=yes;; \
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+      *$$target_option*) has_opt=yes; break;; \
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+am__make_keepgoing = (target_option=k; $(am__make_running_with_option))
+pkgdatadir = $(datadir)/@PACKAGE@
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+am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd
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+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(LTLIBRARIES) $(HEADERS)
+installdirs:
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/cmd-report.Plo
+	-rm -f ./$(DEPDIR)/ext-vnd-report-common.Plo
+	-rm -f ./$(DEPDIR)/ext-vnd-report.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/cmd-report.Plo
+	-rm -f ./$(DEPDIR)/ext-vnd-report-common.Plo
+	-rm -f ./$(DEPDIR)/ext-vnd-report.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/report/cmd-report.c b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/report/cmd-report.c
new file mode 100644
index 0000000..af53e42
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/report/cmd-report.c
@@ -0,0 +1,692 @@
+/* Copyright (c) 2016-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "array.h"
+#include "str.h"
+#include "ioloop.h"
+#include "hostpid.h"
+#include "str-sanitize.h"
+#include "istream.h"
+#include "ostream.h"
+#include "message-date.h"
+#include "message-size.h"
+#include "mail-storage.h"
+
+#include "rfc2822.h"
+
+#include "sieve-common.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-address.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-message.h"
+#include "sieve-actions.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-result.h"
+#include "sieve-address.h"
+#include "sieve-message.h"
+#include "sieve-smtp.h"
+
+#include "ext-vnd-report-common.h"
+
+#include <ctype.h>
+
+/* Report command
+ *
+ * Syntax:
+ *    report [:headers_only] <feedback-type: string>
+ *           <message: string> <address: string>
+ *
+ */
+
+static bool
+cmd_report_registered(struct sieve_validator *valdtr,
+		      const struct sieve_extension *ext,
+		      struct sieve_command_registration *cmd_reg);
+static bool
+cmd_report_validate(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool
+cmd_report_generate(const struct sieve_codegen_env *cgenv,
+		    struct sieve_command *ctx);
+
+const struct sieve_command_def cmd_report = {
+	.identifier = "report",
+	.type = SCT_COMMAND,
+	.positional_args = 3,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = cmd_report_registered,
+	.validate = cmd_report_validate,
+	.generate = cmd_report_generate
+};
+
+/*
+ * Tagged arguments
+ */
+
+static const struct sieve_argument_def report_headers_only_tag = {
+	.identifier = "headers_only"
+};
+
+/*
+ * Report operation
+ */
+
+static bool
+cmd_report_operation_dump(const struct sieve_dumptime_env *denv,
+			  sieve_size_t *address);
+static int
+cmd_report_operation_execute(const struct sieve_runtime_env *renv,
+			     sieve_size_t *address);
+
+const struct sieve_operation_def report_operation = {
+	.mnemonic = "REPORT",
+	.ext_def = &vnd_report_extension,
+	.code = 0,
+	.dump = cmd_report_operation_dump,
+	.execute = cmd_report_operation_execute
+};
+
+/* Codes for optional operands */
+
+enum cmd_report_optional {
+  OPT_END,
+  OPT_HEADERS_ONLY
+};
+
+/*
+ * Report action
+ */
+
+/* Forward declarations */
+
+static int
+act_report_check_duplicate(const struct sieve_runtime_env *renv,
+			   const struct sieve_action *act,
+			   const struct sieve_action *act_other);
+static void
+act_report_print(const struct sieve_action *action,
+		 const struct sieve_result_print_env *rpenv, bool *keep);
+static int
+act_report_commit(const struct sieve_action_exec_env *aenv, void *tr_context);
+
+/* Action object */
+
+const struct sieve_action_def act_report = {
+	.name = "report",
+	.check_duplicate = act_report_check_duplicate,
+	.print = act_report_print,
+	.commit = act_report_commit
+};
+
+/* Action data */
+
+struct act_report_data {
+	const char *feedback_type;
+	const char *message;
+	struct smtp_address *to_address;
+	bool headers_only:1;
+};
+
+/*
+ * Command registration
+ */
+
+static bool
+cmd_report_registered(struct sieve_validator *valdtr,
+		      const struct sieve_extension *ext,
+		      struct sieve_command_registration *cmd_reg)
+{
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &report_headers_only_tag,
+				     OPT_HEADERS_ONLY);
+	return TRUE;
+}
+
+/*
+ * Command validation
+ */
+
+static bool
+cmd_report_validate(struct sieve_validator *valdtr, struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg = cmd->first_positional;
+
+	/* type */
+	if (!sieve_validate_positional_argument(valdtr, cmd, arg,
+						"feedback-type", 1,
+						SAAT_STRING))
+		return FALSE;
+	if (!sieve_validator_argument_activate(valdtr, cmd, arg, FALSE))
+		return FALSE;
+
+	if (sieve_argument_is_string_literal(arg)) {
+		string_t *fbtype = sieve_ast_argument_str(arg);
+		const char *feedback_type;
+
+		T_BEGIN {
+			/* Check feedback type */
+			feedback_type =
+				ext_vnd_report_parse_feedback_type(str_c(fbtype));
+
+			if (feedback_type == NULL) {
+				sieve_argument_validate_error(
+					valdtr, arg,
+					"specified feedback type `%s' is invalid",
+					str_sanitize(str_c(fbtype),128));
+			}
+		} T_END;
+
+		if (feedback_type == NULL)
+			return FALSE;
+	}
+	arg = sieve_ast_argument_next(arg);
+
+	/* message */
+	if (!sieve_validate_positional_argument(valdtr, cmd, arg, "message",
+						2, SAAT_STRING))
+		return FALSE;
+	if (!sieve_validator_argument_activate(valdtr, cmd, arg, FALSE))
+		return FALSE;
+	arg = sieve_ast_argument_next(arg);
+
+	/* address */
+	if (!sieve_validate_positional_argument(valdtr, cmd, arg, "address",
+						3, SAAT_STRING))
+		return FALSE;
+	if (!sieve_validator_argument_activate(valdtr, cmd, arg, FALSE))
+		return FALSE;
+
+	/* We can only assess the validity of the outgoing address when it is a
+	   string literal. For runtime-generated strings this needs to be done
+	   at runtime.
+	 */
+	if (sieve_argument_is_string_literal(arg)) {
+		string_t *raw_address = sieve_ast_argument_str(arg);
+		const char *error;
+		bool result;
+
+		T_BEGIN {
+			/* Parse the address */
+			result = sieve_address_validate_str(raw_address, &error);
+			if (!result) {
+				sieve_argument_validate_error(
+					valdtr, arg,
+					"specified report address '%s' is invalid: %s",
+					str_sanitize(str_c(raw_address),128),
+					error);
+			}
+		} T_END;
+
+		return result;
+	}
+
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool
+cmd_report_generate(const struct sieve_codegen_env *cgenv,
+		    struct sieve_command *cmd)
+{
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &report_operation);
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, cmd, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+cmd_report_operation_dump(const struct sieve_dumptime_env *denv,
+			  sieve_size_t *address)
+{
+	int opt_code = 0;
+
+	sieve_code_dumpf(denv, "REPORT");
+	sieve_code_descend(denv);
+
+	/* Dump optional operands */
+	for (;;) {
+		int opt;
+
+		if ((opt = sieve_opr_optional_dump(denv, address,
+						   &opt_code)) < 0)
+			return FALSE;
+
+		if (opt == 0)
+			break;
+
+		switch (opt_code) {
+		case OPT_HEADERS_ONLY:
+			sieve_code_dumpf(denv, "headers_only");
+			break;
+		default:
+			return FALSE;
+		}
+	}
+
+	return (sieve_opr_string_dump(denv, address, "feedback-type") &&
+		sieve_opr_string_dump(denv, address, "message") &&
+		sieve_opr_string_dump(denv, address, "address"));
+}
+
+/*
+ * Code execution
+ */
+
+
+static int
+cmd_report_operation_execute(const struct sieve_runtime_env *renv,
+			     sieve_size_t *address)
+{
+	const struct sieve_extension *this_ext = renv->oprtn->ext;
+	struct act_report_data *act;
+	string_t *fbtype, *message, *to_address;
+	const char *feedback_type, *error;
+	const struct smtp_address *parsed_address;
+	int opt_code = 0, ret = 0;
+	bool headers_only = FALSE;
+	pool_t pool;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Optional operands */
+
+	for (;;) {
+		int opt;
+
+		if ((opt = sieve_opr_optional_read(renv, address,
+						   &opt_code)) < 0)
+			return SIEVE_EXEC_BIN_CORRUPT;
+
+		if (opt == 0)
+			break;
+
+		switch (opt_code) {
+		case OPT_HEADERS_ONLY:
+			headers_only = TRUE;
+			break;
+		default:
+			sieve_runtime_trace_error(
+				renv, "unknown optional operand");
+			return SIEVE_EXEC_BIN_CORRUPT;
+		}
+	}
+
+	/* Fixed operands */
+
+	if ((ret = sieve_opr_string_read(renv, address, "feedback-type",
+					 &fbtype)) <= 0)
+		return ret;
+	if ((ret = sieve_opr_string_read(renv, address, "message",
+					 &message)) <= 0)
+		return ret;
+	if ((ret = sieve_opr_string_read(renv, address, "address",
+					 &to_address)) <= 0)
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	/* Verify and trim feedback type */
+	feedback_type = ext_vnd_report_parse_feedback_type(str_c(fbtype));
+	if (feedback_type == NULL) {
+		sieve_runtime_error(
+			renv, NULL,
+			"specified report feedback type `%s' is invalid",
+			str_sanitize(str_c(fbtype), 256));
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	/* Verify and normalize the address to 'local_part@domain' */
+	parsed_address = sieve_address_parse_str(to_address, &error);
+	if (parsed_address == NULL) {
+		sieve_runtime_error(
+			renv, NULL,
+			"specified report address '%s' is invalid: %s",
+			str_sanitize(str_c(to_address),128), error);
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	/* Trace */
+	if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_ACTIONS)) {
+		sieve_runtime_trace(renv, 0, "report action");
+		sieve_runtime_trace_descend(renv);
+		sieve_runtime_trace(
+			renv, 0, "report incoming message as `%s' to address %s",
+			str_sanitize(str_c(fbtype), 32),
+			smtp_address_encode_path(parsed_address));
+	}
+
+	/* Add report action to the result */
+
+	pool = sieve_result_pool(renv->result);
+	act = p_new(pool, struct act_report_data, 1);
+	act->headers_only = headers_only;
+	act->feedback_type = p_strdup(pool, feedback_type);
+	act->message = p_strdup(pool, str_c(message));
+	act->to_address = smtp_address_clone(pool, parsed_address);
+
+	if (sieve_result_add_action(renv, this_ext, "report", &act_report, NULL,
+				    (void *)act, 0, TRUE) < 0)
+		return SIEVE_EXEC_FAILURE;
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Action
+ */
+
+/* Runtime verification */
+
+static bool
+act_report_equals(const struct sieve_script_env *senv ATTR_UNUSED,
+		  const struct sieve_action *act1,
+		  const struct sieve_action *act2)
+{
+	struct act_report_data *rdd1 = (struct act_report_data *)act1->context;
+	struct act_report_data *rdd2 = (struct act_report_data *)act2->context;
+
+	/* Address is already normalized */
+	return (smtp_address_equals(rdd1->to_address, rdd2->to_address));
+}
+
+static int
+act_report_check_duplicate(const struct sieve_runtime_env *renv,
+			   const struct sieve_action *act,
+			   const struct sieve_action *act_other)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+
+	return (act_report_equals(eenv->scriptenv, act, act_other) ? 1 : 0);
+}
+
+/* Result printing */
+
+static void
+act_report_print(const struct sieve_action *action,
+		 const struct sieve_result_print_env *rpenv,
+		 bool *keep ATTR_UNUSED)
+{
+	const struct act_report_data *rdd =
+		(struct act_report_data *)action->context;
+
+	sieve_result_action_printf(rpenv,
+		"report incoming message as `%s' to: %s",
+		str_sanitize(rdd->feedback_type, 32),
+		smtp_address_encode_path(rdd->to_address));
+}
+
+/* Result execution */
+
+static bool _contains_8bit(const char *msg)
+{
+	const unsigned char *s = (const unsigned char *)msg;
+
+	for (; *s != '\0'; s++) {
+		if ((*s & 0x80) != 0)
+			return TRUE;
+	}
+	return FALSE;
+}
+
+static int
+act_report_send(const struct sieve_action_exec_env *aenv,
+		const struct ext_report_config *config,
+		const struct act_report_data *act)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct sieve_instance *svinst = eenv->svinst;
+	struct sieve_message_context *msgctx = aenv->msgctx;
+	const struct sieve_script_env *senv = eenv->scriptenv;
+	const struct sieve_message_data *msgdata = eenv->msgdata;
+	struct sieve_address_source report_from = config->report_from;
+	const struct smtp_address *sender, *user;
+	struct sieve_smtp_context *sctx;
+	struct istream *input;
+	struct ostream *output;
+	string_t *msg;
+	const char *const *headers;
+	const char *outmsgid, *boundary, *error, *subject, *from;
+	int ret;
+
+	/* Just to be sure */
+	if (!sieve_smtp_available(senv)) {
+		sieve_result_global_warning(
+			aenv, "report action has no means to send mail");
+		return SIEVE_EXEC_OK;
+	}
+
+	/* Make sure we have a subject for our report */
+	if ((ret = mail_get_headers_utf8(msgdata->mail, "subject",
+					 &headers)) < 0) {
+		return sieve_result_mail_error(
+			aenv, msgdata->mail,
+			"failed to read header field `subject'");
+	}
+	if (ret > 0 && headers[0] != NULL)
+		subject = t_strconcat("Report: ", headers[0], NULL);
+	else
+		subject = "Report: (message without subject)";
+
+	/* Determine from address */
+	if (report_from.type == SIEVE_ADDRESS_SOURCE_POSTMASTER) {
+		report_from.type = SIEVE_ADDRESS_SOURCE_DEFAULT;
+		report_from.address = NULL;
+	}
+	if (sieve_address_source_get_address(
+		&report_from, svinst, senv, msgctx, eenv->flags,
+		&sender) > 0 && sender != NULL)
+		from = smtp_address_encode_path(sender);
+	else
+		from = sieve_get_postmaster_address(senv);
+
+	/* Start message */
+	sctx = sieve_smtp_start_single(senv, act->to_address, NULL, &output);
+
+	outmsgid = sieve_message_get_new_id(svinst);
+	boundary = t_strdup_printf("%s/%s", my_pid, svinst->hostname);
+
+	/* Compose main report headers */
+	msg = t_str_new(512);
+	rfc2822_header_write(msg, "X-Sieve", SIEVE_IMPLEMENTATION);
+	rfc2822_header_write(msg, "Message-ID", outmsgid);
+	rfc2822_header_write(msg, "Date", message_date_create(ioloop_time));
+
+	rfc2822_header_write(msg, "From", from);
+	rfc2822_header_write(msg, "To",
+			     smtp_address_encode_path(act->to_address));
+
+	if (_contains_8bit(subject))
+		rfc2822_header_utf8_printf(msg, "Subject", "%s", subject);
+	else
+		rfc2822_header_printf(msg, "Subject", "%s", subject);
+
+	rfc2822_header_write(msg, "Auto-Submitted", "auto-generated (report)");
+
+	rfc2822_header_write(msg, "MIME-Version", "1.0");
+	rfc2822_header_printf(msg, "Content-Type",
+		"multipart/report; report-type=feedback-report;\n"
+		"boundary=\"%s\"", boundary);
+
+	str_append(msg, "\r\nThis is a MIME-encapsulated message\r\n\r\n");
+
+	/* Human-readable report */
+	str_printfa(msg, "--%s\r\n", boundary);
+	if (_contains_8bit(act->message)) {
+		rfc2822_header_write(msg, "Content-Type",
+				     "text/plain; charset=utf-8");
+		rfc2822_header_write(msg, "Content-Transfer-Encoding", "8bit");
+	} else {
+		rfc2822_header_write(msg, "Content-Type",
+				     "text/plain; charset=us-ascii");
+		rfc2822_header_write(msg, "Content-Transfer-Encoding", "7bit");
+	}
+	rfc2822_header_write(msg, "Content-Disposition", "inline");
+
+	str_printfa(msg, "\r\n%s\r\n\r\n", act->message);
+	o_stream_nsend(output, str_data(msg), str_len(msg));
+
+	/* Machine-readable report */
+	str_truncate(msg, 0);
+	str_printfa(msg, "--%s\r\n", boundary);
+	rfc2822_header_write(msg, "Content-Type", "message/feedback-report");
+	str_append(msg, "\r\n");
+
+	rfc2822_header_write(msg, "Version", "1");
+	rfc2822_header_write(msg, "Feedback-Type", act->feedback_type);
+	rfc2822_header_write(msg, "User-Agent",
+			     PACKAGE_NAME "/" PACKAGE_VERSION " "
+			     PIGEONHOLE_NAME "/" PIGEONHOLE_VERSION);
+
+	if ((eenv->flags & SIEVE_EXECUTE_FLAG_NO_ENVELOPE) == 0) {
+		const struct smtp_address *sender, *orig_recipient;
+
+		sender = sieve_message_get_sender(msgctx);
+		orig_recipient = sieve_message_get_orig_recipient(msgctx);
+
+		rfc2822_header_write(msg, "Original-Mail-From",
+				     smtp_address_encode_path(sender));
+		if (orig_recipient != NULL) {
+			rfc2822_header_write(
+				msg, "Original-Rcpt-To",
+				smtp_address_encode_path(orig_recipient));
+		}
+	}
+	if (svinst->user_email != NULL)
+		user = svinst->user_email;
+	else if ((eenv->flags & SIEVE_EXECUTE_FLAG_NO_ENVELOPE) != 0 ||
+		 (user = sieve_message_get_orig_recipient(msgctx)) == NULL)
+		user = sieve_get_user_email(svinst);
+	if (user != NULL) {
+		rfc2822_header_write(msg, "Dovecot-Reporting-User",
+				     smtp_address_encode_path(user));
+	}
+	str_append(msg, "\r\n");
+
+	o_stream_nsend(output, str_data(msg), str_len(msg));
+
+	/* Original message */
+	str_truncate(msg, 0);
+	str_printfa(msg, "--%s\r\n", boundary);
+	if (act->headers_only) {
+		rfc2822_header_write(msg, "Content-Type",
+				     "text/rfc822-headers");
+	} else {
+		rfc2822_header_write(msg, "Content-Type", "message/rfc822");
+	}
+	rfc2822_header_write(msg, "Content-Disposition", "attachment");
+	str_append(msg, "\r\n");
+	o_stream_nsend(output, str_data(msg), str_len(msg));
+
+	if (act->headers_only) {
+		struct message_size hdr_size;
+		ret = mail_get_hdr_stream(msgdata->mail, &hdr_size, &input);
+		if (ret >= 0) {
+			input = i_stream_create_limit(
+				input, hdr_size.physical_size);
+		}
+	} else {
+		ret = mail_get_stream(msgdata->mail, NULL, NULL, &input);
+		if (ret >= 0)
+			i_stream_ref(input);
+	}
+	if (ret < 0) {
+		sieve_smtp_abort(sctx);
+		return sieve_result_mail_error(aenv, msgdata->mail,
+					       "failed to read input message");
+	}
+
+	o_stream_nsend_istream(output, input);
+
+	if (input->stream_errno != 0) {
+		/* Error; clean up */
+		sieve_result_critical(aenv, "failed to read input message",
+				      "read(%s) failed: %s",
+				      i_stream_get_name(input),
+				      i_stream_get_error(input));
+		i_stream_unref(&input);
+		sieve_smtp_abort(sctx);
+		return SIEVE_EXEC_OK;
+	}
+	i_stream_unref(&input);
+
+	str_truncate(msg, 0);
+	if (!act->headers_only)
+		str_printfa(msg, "\r\n");
+	str_printfa(msg, "\r\n--%s--\r\n", boundary);
+	o_stream_nsend(output, str_data(msg), str_len(msg));
+
+	/* Finish sending message */
+	if ((ret = sieve_smtp_finish(sctx, &error)) <= 0) {
+		if (ret < 0) {
+			sieve_result_global_error(
+				aenv, "failed to send `%s' report to <%s>: %s "
+				"(temporary failure)",
+				str_sanitize(act->feedback_type, 32),
+				smtp_address_encode(act->to_address),
+				str_sanitize(error, 512));
+		} else {
+			sieve_result_global_log_error(
+				aenv, "failed to send `%s' report to <%s>: %s "
+				"(permanent failure)",
+				str_sanitize(act->feedback_type, 32),
+				smtp_address_encode(act->to_address),
+				str_sanitize(error, 512));
+		}
+	} else {
+		eenv->exec_status->significant_action_executed = TRUE;
+
+		struct event_passthrough *e =
+			sieve_action_create_finish_event(aenv)->
+			add_str("report_target",
+				smtp_address_encode(act->to_address))->
+			add_str("report_type",
+				str_sanitize(act->feedback_type, 32));
+
+		sieve_result_event_log(aenv, e->event(),
+				       "sent `%s' report to <%s>",
+				       str_sanitize(act->feedback_type, 32),
+				       smtp_address_encode(act->to_address));
+	}
+
+	return SIEVE_EXEC_OK;
+}
+
+static int
+act_report_commit(const struct sieve_action_exec_env *aenv,
+		  void *tr_context ATTR_UNUSED)
+{
+	const struct sieve_action *action = aenv->action;
+	const struct sieve_extension *ext = action->ext;
+	const struct ext_report_config *config =
+		(const struct ext_report_config *)ext->context;
+	const struct act_report_data *act =
+		(const struct act_report_data *)action->context;
+	int ret;
+
+	T_BEGIN {
+		ret = act_report_send(aenv, config, act);
+	} T_END;
+
+	if (ret == SIEVE_EXEC_TEMP_FAILURE)
+		return SIEVE_EXEC_TEMP_FAILURE;
+
+	/* Ignore all other errors */
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/report/ext-vnd-report-common.c b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/report/ext-vnd-report-common.c
new file mode 100644
index 0000000..d22ad16
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/report/ext-vnd-report-common.c
@@ -0,0 +1,51 @@
+/* Copyright (c) 2016-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "rfc822-parser.h"
+
+#include "sieve-common.h"
+#include "sieve-extensions.h"
+
+#include "ext-vnd-report-common.h"
+
+bool ext_report_load
+(const struct sieve_extension *ext, void **context)
+{
+	struct sieve_instance *svinst = ext->svinst;
+	struct ext_report_config *config;
+
+	config = p_new(svinst->pool, struct ext_report_config, 1);
+
+	(void)sieve_address_source_parse_from_setting(svinst,
+		svinst->pool, "sieve_report_from", &config->report_from);
+
+	*context = (void *) config;
+	return TRUE;
+}
+
+const char *
+ext_vnd_report_parse_feedback_type(const char *feedback_type)
+{
+	struct rfc822_parser_context parser;
+	string_t *token;
+
+	/* Initialize parsing */
+	rfc822_parser_init(&parser,
+		(const unsigned char *)feedback_type, strlen(feedback_type), NULL);
+	(void)rfc822_skip_lwsp(&parser);
+
+	/* Parse MIME token */
+	token = t_str_new(64);
+	if (rfc822_parse_mime_token(&parser, token) < 0)
+		return NULL;
+
+	/* Content-type value must end here, otherwise it is invalid after all */
+	(void)rfc822_skip_lwsp(&parser);
+	if ( parser.data != parser.end )
+		return NULL;
+
+	/* Success */
+	return str_c(token);
+}
diff --git a/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/report/ext-vnd-report-common.h b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/report/ext-vnd-report-common.h
new file mode 100644
index 0000000..11a3757
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/report/ext-vnd-report-common.h
@@ -0,0 +1,40 @@
+#ifndef EXT_REPORT_COMMON_H
+#define EXT_REPORT_COMMON_H
+
+/*
+ * Extension configuration
+ */
+
+struct ext_report_config {
+	struct sieve_address_source report_from;
+};
+
+/*
+ * Extension
+ */
+
+extern const struct sieve_extension_def vnd_report_extension;
+
+bool ext_report_load
+	(const struct sieve_extension *ext, void **context);
+
+/*
+ * Commands
+ */
+
+extern const struct sieve_command_def cmd_report;
+
+/*
+ * Operations
+ */
+
+extern const struct sieve_operation_def report_operation;
+
+/*
+ * RFC 5965 feedback-type
+ */
+
+const char *
+ext_vnd_report_parse_feedback_type(const char *feedback_type);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/report/ext-vnd-report.c b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/report/ext-vnd-report.c
new file mode 100644
index 0000000..a5fb64c
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/report/ext-vnd-report.c
@@ -0,0 +1,52 @@
+/* Copyright (c) 2016-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension report
+ * ----------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: draft-ietf-sieve-report-00.txt
+ * Implementation: full, but deprecated; provided for backwards compatibility
+ * Status: testing
+ *
+ */
+
+#include "sieve-common.h"
+
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-actions.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-result.h"
+
+#include "ext-vnd-report-common.h"
+
+/*
+ * Extension
+ */
+
+static bool ext_report_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+
+const struct sieve_extension_def vnd_report_extension = {
+	.name = "vnd.dovecot.report",
+	.load = ext_report_load,
+	.validator_load = ext_report_validator_load,
+	SIEVE_EXT_DEFINE_OPERATION(report_operation)
+};
+
+/*
+ * Extension validation
+ */
+
+static bool ext_report_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	/* Register new commands */
+	sieve_validator_register_command(valdtr, ext, &cmd_report);
+
+	return TRUE;
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-actions.c b/pigeonhole/src/lib-sieve/sieve-actions.c
new file mode 100644
index 0000000..86c9954
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-actions.c
@@ -0,0 +1,1096 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "strfuncs.h"
+#include "ioloop.h"
+#include "hostpid.h"
+#include "str-sanitize.h"
+#include "unichar.h"
+#include "istream.h"
+#include "istream-header-filter.h"
+#include "ostream.h"
+#include "smtp-params.h"
+#include "mail-storage.h"
+#include "message-date.h"
+#include "message-size.h"
+
+#include "rfc2822.h"
+
+#include "sieve-code.h"
+#include "sieve-settings.h"
+#include "sieve-extensions.h"
+#include "sieve-binary.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-result.h"
+#include "sieve-actions.h"
+#include "sieve-message.h"
+#include "sieve-smtp.h"
+
+/*
+ * Action execution environment
+ */
+
+struct event_passthrough *
+sieve_action_create_finish_event(const struct sieve_action_exec_env *aenv)
+{
+	struct event_passthrough *e =
+		event_create_passthrough(aenv->event)->
+		set_name("sieve_action_finished");
+
+	return e;
+}
+
+/*
+ * Action instance
+ */
+
+bool sieve_action_is_executed(const struct sieve_action *act,
+			      struct sieve_result *result)
+{
+	unsigned int cur_exec_seq = sieve_result_get_exec_seq(result);
+
+	i_assert(act->exec_seq <= cur_exec_seq);
+	return (act->exec_seq < cur_exec_seq);
+}
+
+/*
+ * Side-effect operand
+ */
+
+const struct sieve_operand_class
+sieve_side_effect_operand_class = { "SIDE-EFFECT" };
+
+bool sieve_opr_side_effect_dump(const struct sieve_dumptime_env *denv,
+				sieve_size_t *address)
+{
+	struct sieve_side_effect seffect;
+	const struct sieve_side_effect_def *sdef;
+
+	if (!sieve_opr_object_dump(denv, &sieve_side_effect_operand_class,
+				   address, &seffect.object))
+		return FALSE;
+
+	sdef = seffect.def =
+		(const struct sieve_side_effect_def *)seffect.object.def;
+
+	if (sdef->dump_context != NULL) {
+		sieve_code_descend(denv);
+		if (!sdef->dump_context(&seffect, denv, address))
+			return FALSE;
+		sieve_code_ascend(denv);
+	}
+	return TRUE;
+}
+
+int sieve_opr_side_effect_read(const struct sieve_runtime_env *renv,
+			       sieve_size_t *address,
+			       struct sieve_side_effect *seffect)
+{
+	const struct sieve_side_effect_def *sdef;
+	int ret;
+
+	seffect->context = NULL;
+
+	if (!sieve_opr_object_read(renv, &sieve_side_effect_operand_class,
+				   address, &seffect->object))
+		return SIEVE_EXEC_BIN_CORRUPT;
+
+	sdef = seffect->def =
+		(const struct sieve_side_effect_def *)seffect->object.def;
+
+	if (sdef->read_context != NULL &&
+	    (ret = sdef->read_context(seffect, renv, address,
+				      &seffect->context)) <= 0)
+		return ret;
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Optional operands
+ */
+
+int sieve_action_opr_optional_dump(const struct sieve_dumptime_env *denv,
+				   sieve_size_t *address, signed int *opt_code)
+{
+	signed int _opt_code = 0;
+	bool final = FALSE, opok = TRUE;
+
+	if (opt_code == NULL) {
+		opt_code = &_opt_code;
+		final = TRUE;
+	}
+
+	while (opok) {
+		int opt;
+
+		opt = sieve_opr_optional_dump(denv, address, opt_code);
+		if (opt <= 0)
+			return opt;
+
+		if (*opt_code == SIEVE_OPT_SIDE_EFFECT)
+			opok = sieve_opr_side_effect_dump(denv, address);
+		else
+			return (final ? -1 : 1);
+	}
+
+	return -1;
+}
+
+int sieve_action_opr_optional_read(const struct sieve_runtime_env *renv,
+				   sieve_size_t *address,
+				   signed int *opt_code, int *exec_status,
+				   struct sieve_side_effects_list **list)
+{
+	signed int _opt_code = 0;
+	bool final = FALSE;
+	int ret;
+
+	if (opt_code == NULL) {
+		opt_code = &_opt_code;
+		final = TRUE;
+	}
+
+	if (exec_status != NULL)
+		*exec_status = SIEVE_EXEC_OK;
+
+	for (;;) {
+		int opt;
+
+		opt = sieve_opr_optional_read(renv, address, opt_code);
+		if (opt <= 0) {
+			if (opt < 0 && exec_status != NULL)
+				*exec_status = SIEVE_EXEC_BIN_CORRUPT;
+			return opt;
+		}
+
+		if (*opt_code == SIEVE_OPT_SIDE_EFFECT) {
+			struct sieve_side_effect seffect;
+
+			i_assert(list != NULL);
+
+			ret = sieve_opr_side_effect_read(renv, address,
+							 &seffect);
+			if (ret <= 0) {
+				if (exec_status != NULL)
+					*exec_status = ret;
+				return -1;
+			}
+
+			if (*list == NULL) {
+				*list = sieve_side_effects_list_create(
+					renv->result);
+			}
+
+			sieve_side_effects_list_add(*list, &seffect);
+		} else {
+			if (final) {
+				sieve_runtime_trace_error(
+					renv, "invalid optional operand");
+				if (exec_status != NULL)
+					*exec_status = SIEVE_EXEC_BIN_CORRUPT;
+				return -1;
+			}
+			return 1;
+		}
+	}
+
+	i_unreached();
+	return -1;
+}
+
+/*
+ * Store action
+ */
+
+/* Forward declarations */
+
+static bool
+act_store_equals(const struct sieve_script_env *senv,
+		 const struct sieve_action *act1,
+		 const struct sieve_action *act2);
+
+static int
+act_store_check_duplicate(const struct sieve_runtime_env *renv,
+			  const struct sieve_action *act,
+			  const struct sieve_action *act_other);
+static void
+act_store_print(const struct sieve_action *action,
+		const struct sieve_result_print_env *rpenv, bool *keep);
+
+static int
+act_store_start(const struct sieve_action_exec_env *aenv, void **tr_context);
+static int
+act_store_execute(const struct sieve_action_exec_env *aenv, void *tr_context,
+		  bool *keep);
+static int
+act_store_commit(const struct sieve_action_exec_env *aenv, void *tr_context);
+static void
+act_store_rollback(const struct sieve_action_exec_env *aenv, void *tr_context,
+		   bool success);
+
+/* Action object */
+
+const struct sieve_action_def act_store = {
+	.name = "store",
+	.flags =
+		SIEVE_ACTFLAG_TRIES_DELIVER | 
+		SIEVE_ACTFLAG_MAIL_STORAGE,
+	.equals = act_store_equals,
+	.check_duplicate = act_store_check_duplicate,
+	.print = act_store_print,
+	.start = act_store_start,
+	.execute = act_store_execute,
+	.commit = act_store_commit,
+	.rollback = act_store_rollback,
+};
+
+/* API */
+
+int sieve_act_store_add_to_result(const struct sieve_runtime_env *renv,
+				  const char *name,
+				  struct sieve_side_effects_list *seffects,
+				  const char *mailbox)
+{
+	pool_t pool;
+	struct act_store_context *act;
+
+	/* Add redirect action to the result */
+	pool = sieve_result_pool(renv->result);
+	act = p_new(pool, struct act_store_context, 1);
+	act->mailbox = p_strdup(pool, mailbox);
+
+	return sieve_result_add_action(renv, NULL, name, &act_store, seffects,
+				       (void *)act, 0, TRUE);
+}
+
+void sieve_act_store_add_flags(const struct sieve_action_exec_env *aenv,
+			       void *tr_context, const char *const *keywords,
+			       enum mail_flags flags)
+{
+	struct act_store_transaction *trans =
+		(struct act_store_transaction *)tr_context;
+
+	i_assert(trans != NULL);
+
+	/* Assign mail keywords for subsequent mailbox_copy() */
+	if (*keywords != NULL) {
+		const char *const *kw;
+
+		if (!array_is_created(&trans->keywords)) {
+			pool_t pool = sieve_result_pool(aenv->result);
+			p_array_init(&trans->keywords, pool, 2);
+		}
+
+		kw = keywords;
+		while (*kw != NULL) {
+			array_append(&trans->keywords, kw, 1);
+			kw++;
+		}
+	}
+
+	/* Assign mail flags for subsequent mailbox_copy() */
+	trans->flags |= flags;
+
+	trans->flags_altered = TRUE;
+}
+
+/* Equality */
+
+static bool
+act_store_equals(const struct sieve_script_env *senv,
+		 const struct sieve_action *act1,
+		 const struct sieve_action *act2)
+{
+	struct act_store_context *st_ctx1 =
+		(act1 == NULL ?
+		 NULL : (struct act_store_context *)act1->context);
+	struct act_store_context *st_ctx2 =
+		(act2 == NULL ?
+		 NULL : (struct act_store_context *)act2->context);
+	const char *mailbox1, *mailbox2;
+
+	/* FIXME: consider namespace aliases */
+
+	if (st_ctx1 == NULL && st_ctx2 == NULL)
+		return TRUE;
+
+	mailbox1 = (st_ctx1 == NULL ?
+		    SIEVE_SCRIPT_DEFAULT_MAILBOX(senv) : st_ctx1->mailbox);
+	mailbox2 = (st_ctx2 == NULL ?
+		    SIEVE_SCRIPT_DEFAULT_MAILBOX(senv) : st_ctx2->mailbox);
+
+	if (strcmp(mailbox1, mailbox2) == 0)
+		return TRUE;
+
+	return (strcasecmp(mailbox1, "INBOX") == 0 &&
+		strcasecmp(mailbox2, "INBOX") == 0);
+}
+
+/* Result verification */
+
+static int
+act_store_check_duplicate(const struct sieve_runtime_env *renv,
+			  const struct sieve_action *act,
+			  const struct sieve_action *act_other)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+
+	return (act_store_equals(eenv->scriptenv, act, act_other) ? 1 : 0);
+}
+
+/* Result printing */
+
+static void
+act_store_print(const struct sieve_action *action,
+		const struct sieve_result_print_env *rpenv, bool *keep)
+{
+	struct act_store_context *ctx =
+		(struct act_store_context *)action->context;
+	const char *mailbox;
+
+	mailbox = (ctx == NULL ?
+		   SIEVE_SCRIPT_DEFAULT_MAILBOX(rpenv->scriptenv) :
+			ctx->mailbox);
+
+	sieve_result_action_printf(rpenv, "store message in folder: %s",
+				   str_sanitize(mailbox, 128));
+
+	*keep = FALSE;
+}
+
+/* Action implementation */
+
+void sieve_act_store_get_storage_error(const struct sieve_action_exec_env *aenv,
+				       struct act_store_transaction *trans)
+{
+	pool_t pool = sieve_result_pool(aenv->result);
+
+	trans->error = p_strdup(pool,
+		mailbox_get_last_internal_error(trans->box,
+						&trans->error_code));
+}
+
+static bool
+act_store_mailbox_alloc(const struct sieve_action_exec_env *aenv,
+		        const char *mailbox, struct mailbox **box_r,
+			enum mail_error *error_code_r, const char **error_r)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct mailbox *box;
+	struct mail_storage **storage = &(eenv->exec_status->last_storage);
+	enum mailbox_flags flags = MAILBOX_FLAG_POST_SESSION;
+
+	*box_r = NULL;
+	*error_code_r = MAIL_ERROR_NONE;
+	*error_r = NULL;
+
+	if (!uni_utf8_str_is_valid(mailbox)) {
+		/* Just a precaution; already (supposed to be) checked at
+		   compiletime/runtime.
+		 */
+		*error_r = t_strdup_printf("mailbox name not utf-8: %s",
+					   mailbox);
+		*error_code_r = MAIL_ERROR_PARAMS;
+		return FALSE;
+	}
+
+	if (eenv->scriptenv->mailbox_autocreate)
+		flags |= MAILBOX_FLAG_AUTO_CREATE;
+	if (eenv->scriptenv->mailbox_autosubscribe)
+		flags |= MAILBOX_FLAG_AUTO_SUBSCRIBE;
+	*box_r = box = mailbox_alloc_for_user(eenv->scriptenv->user, mailbox,
+					      flags);
+	*storage = mailbox_get_storage(box);
+
+	return TRUE;
+}
+
+static int
+act_store_start(const struct sieve_action_exec_env *aenv, void **tr_context)
+{
+	const struct sieve_action *action = aenv->action;
+	struct act_store_context *ctx =
+		(struct act_store_context *)action->context;
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	const struct sieve_script_env *senv = eenv->scriptenv;
+	struct act_store_transaction *trans;
+	struct mailbox *box = NULL;
+	pool_t pool = sieve_result_pool(aenv->result);
+	const char *error = NULL;
+	enum mail_error error_code = MAIL_ERROR_NONE;
+	bool disabled = FALSE, alloc_failed = FALSE;
+
+	/* If context is NULL, the store action is the result of (implicit)
+	   keep.
+	 */
+	if (ctx == NULL) {
+		ctx = p_new(pool, struct act_store_context, 1);
+		ctx->mailbox =
+			p_strdup(pool, SIEVE_SCRIPT_DEFAULT_MAILBOX(senv));
+	}
+
+	e_debug(aenv->event, "Start storing into mailbox %s", ctx->mailbox);
+
+	/* Open the requested mailbox */
+
+	/* NOTE: The caller of the sieve library is allowed to leave user set
+	   to NULL. This implementation will then skip actually storing the
+	   message.
+	 */
+	if (senv->user != NULL) {
+		if (!act_store_mailbox_alloc(aenv, ctx->mailbox, &box,
+					     &error_code, &error))
+			alloc_failed = TRUE;
+	} else {
+		disabled = TRUE;
+	}
+
+	/* Create transaction context */
+	trans = p_new(pool, struct act_store_transaction, 1);
+
+	trans->context = ctx;
+	trans->box = box;
+	trans->flags = 0;
+
+	trans->mailbox_name = ctx->mailbox;
+	trans->mailbox_identifier =
+		p_strdup_printf(pool, "'%s'", str_sanitize(ctx->mailbox, 256));
+
+	trans->disabled = disabled;
+
+	if (alloc_failed) {
+		trans->error = p_strdup(pool, error);
+		trans->error_code = error_code;
+		e_debug(aenv->event, "Failed to open mailbox %s: %s",
+			trans->mailbox_identifier, trans->error);
+	} else {
+		trans->error_code = MAIL_ERROR_NONE;
+	}
+
+	*tr_context = (void *)trans;
+
+	switch (trans->error_code) {
+	case MAIL_ERROR_NONE:
+	case MAIL_ERROR_NOTFOUND:
+		return SIEVE_EXEC_OK;
+	case MAIL_ERROR_TEMP:
+		return SIEVE_EXEC_TEMP_FAILURE;
+	default:
+		break;
+	}
+	return SIEVE_EXEC_FAILURE;
+}
+
+static struct mail_keywords *
+act_store_keywords_create(const struct sieve_action_exec_env *aenv,
+			  ARRAY_TYPE(const_string) *keywords,
+			  struct mailbox *box, bool create_empty)
+{
+	struct mail_keywords *box_keywords = NULL;
+	const char *const *kwds = NULL;
+
+	if (!array_is_created(keywords) || array_count(keywords) == 0) {
+		if (!create_empty)
+			return NULL;
+	} else {
+		ARRAY_TYPE(const_string) valid_keywords;
+		const char *error;
+		unsigned int count, i;
+
+		kwds = array_get(keywords, &count);
+		t_array_init(&valid_keywords, count);
+
+		for (i = 0; i < count; i++) {
+			if (mailbox_keyword_is_valid(box, kwds[i], &error)) {
+				array_append(&valid_keywords, &kwds[i], 1);
+				continue;
+			}
+
+			sieve_result_warning(aenv,
+				"specified IMAP keyword '%s' is invalid "
+				"(ignored): %s",  str_sanitize(kwds[i], 64),
+				sieve_error_from_external(error));
+		}
+
+		array_append_zero(keywords);
+		kwds = array_idx(keywords, 0);
+	}
+
+	if (mailbox_keywords_create(box, kwds, &box_keywords) < 0) {
+		sieve_result_error(
+			aenv, "invalid keywords set for stored message");
+		return NULL;
+	}
+
+	return box_keywords;
+}
+
+static bool have_equal_keywords(struct mail *mail, struct mail_keywords *new_kw)
+{
+	const ARRAY_TYPE(keyword_indexes) *old_kw_arr =
+		mail_get_keyword_indexes(mail);
+	const unsigned int *old_kw;
+	unsigned int i, j;
+
+	if (array_count(old_kw_arr) != new_kw->count)
+		return FALSE;
+	if (new_kw->count == 0)
+		return TRUE;
+
+	old_kw = array_front(old_kw_arr);
+	for (i = 0; i < new_kw->count; i++) {
+		/* new_kw->count equals old_kw's count and it's easier to use */
+		for (j = 0; j < new_kw->count; j++) {
+			if (old_kw[j] == new_kw->idx[i])
+				break;
+		}
+		if (j == new_kw->count)
+			return FALSE;
+	}
+	return TRUE;
+}
+
+static int
+act_store_execute(const struct sieve_action_exec_env *aenv, void *tr_context,
+		  bool *keep)
+{
+	const struct sieve_action *action = aenv->action;
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct act_store_transaction *trans =
+		(struct act_store_transaction *)tr_context;
+	struct mail *mail = (action->mail != NULL ?
+			     action->mail : eenv->msgdata->mail);
+	struct mail_save_context *save_ctx;
+	struct mail_keywords *keywords = NULL;
+	struct mailbox *box;
+	bool backends_equal = FALSE;
+	int status = SIEVE_EXEC_OK;
+
+	/* Verify transaction */
+	if (trans == NULL)
+		return SIEVE_EXEC_FAILURE;
+	box = trans->box;
+
+	/* Check whether we need to do anything */
+	if (trans->disabled) {
+		e_debug(aenv->event, "Skip storing into mailbox %s",
+			trans->mailbox_identifier);
+		*keep = FALSE;
+		return SIEVE_EXEC_OK;
+	}
+
+	/* Exit early if mailbox is not available */
+	if (box == NULL)
+		return SIEVE_EXEC_FAILURE;
+
+	e_debug(aenv->event, "Execute storing into mailbox %s",
+		trans->mailbox_identifier);
+
+	/* Mark attempt to use storage. Can only get here when all previous
+	   actions succeeded.
+	 */
+	eenv->exec_status->last_storage = mailbox_get_storage(box);
+
+	/* Open the mailbox (may already be open) */
+	if (trans->error_code == MAIL_ERROR_NONE) {
+		if (mailbox_open(box) < 0) {
+			sieve_act_store_get_storage_error(aenv, trans);
+			e_debug(aenv->event, "Failed to open mailbox %s: %s",
+				trans->mailbox_identifier, trans->error);
+		}
+	}
+
+	/* Exit early if transaction already failed */
+ 	switch (trans->error_code) {
+	case MAIL_ERROR_NONE:
+		break;
+	case MAIL_ERROR_TEMP:
+		return SIEVE_EXEC_TEMP_FAILURE;
+	default:
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	/* If the message originates from the target mailbox, only update the
+	   flags and keywords (if not read-only)
+	 */
+	if (mailbox_backends_equal(box, mail->box)) {
+		backends_equal = TRUE;
+	} else {
+		struct mail *real_mail;
+
+		if (mail_get_backend_mail(mail, &real_mail) < 0)
+			return SIEVE_EXEC_FAILURE;
+		if (real_mail != mail &&
+		    mailbox_backends_equal(box, real_mail->box))
+			backends_equal = TRUE;
+	}
+	if (backends_equal) {
+		trans->redundant = TRUE;
+
+		if (trans->flags_altered && !mailbox_is_readonly(mail->box)) {
+			keywords = act_store_keywords_create(
+				aenv, &trans->keywords, mail->box, TRUE);
+
+			if (keywords != NULL) {
+				if (!have_equal_keywords(mail, keywords)) {
+					eenv->exec_status->significant_action_executed = TRUE;
+					mail_update_keywords(mail, MODIFY_REPLACE, keywords);
+				}
+				mailbox_keywords_unref(&keywords);
+			}
+
+			if ((mail_get_flags(mail) & MAIL_FLAGS_NONRECENT) != trans->flags) {
+				eenv->exec_status->significant_action_executed = TRUE;
+				mail_update_flags(mail, MODIFY_REPLACE, trans->flags);
+			}
+		}
+		e_debug(aenv->event, "Updated existing mail in mailbox %s",
+			trans->mailbox_identifier);
+		return SIEVE_EXEC_OK;
+
+	/* If the message is modified, only store it in the source mailbox when
+	   it is not opened read-only. Mail structs of modified messages have
+	   their own mailbox, unrelated to the orignal mail, so this case needs
+	   to be handled separately.
+	 */
+	} else if (mail != eenv->msgdata->mail &&
+		   mailbox_is_readonly(eenv->msgdata->mail->box) &&
+		   (mailbox_backends_equal(box, eenv->msgdata->mail->box))) {
+		e_debug(aenv->event,
+			"Not modifying exsiting mail in read-only mailbox %s",
+			trans->mailbox_identifier);
+		trans->redundant = TRUE;
+		return SIEVE_EXEC_OK;
+	}
+
+	/* Mark attempt to store in default mailbox */
+	if (strcmp(trans->context->mailbox,
+		   SIEVE_SCRIPT_DEFAULT_MAILBOX(eenv->scriptenv)) == 0)
+		eenv->exec_status->tried_default_save = TRUE;
+
+	/* Start mail transaction */
+	trans->mail_trans = mailbox_transaction_begin(
+		box, MAILBOX_TRANSACTION_FLAG_EXTERNAL, __func__);
+
+	/* Store the message */
+	save_ctx = mailbox_save_alloc(trans->mail_trans);
+
+	/* Apply keywords and flags that side-effects may have added */
+	if (trans->flags_altered) {
+		keywords = act_store_keywords_create(aenv, &trans->keywords,
+						     box, FALSE);
+
+		if (trans->flags != 0 || keywords != NULL) {
+			eenv->exec_status->significant_action_executed = TRUE;
+			mailbox_save_set_flags(save_ctx, trans->flags, keywords);
+		}
+	} else {
+		mailbox_save_copy_flags(save_ctx, mail);
+	}
+
+	if (mailbox_save_using_mail(&save_ctx, mail) < 0) {
+		sieve_act_store_get_storage_error(aenv, trans);
+		e_debug(aenv->event, "Failed to save to mailbox %s: %s",
+			trans->mailbox_identifier, trans->error);
+
+		status = (trans->error_code == MAIL_ERROR_TEMP ?
+			  SIEVE_EXEC_TEMP_FAILURE : SIEVE_EXEC_FAILURE);
+	} else {
+		e_debug(aenv->event, "Saving to mailbox %s successful so far",
+			trans->mailbox_identifier);
+		eenv->exec_status->significant_action_executed = TRUE;
+	}
+
+	/* Deallocate keywords */
+ 	if (keywords != NULL)
+ 		mailbox_keywords_unref(&keywords);
+
+	/* Cancel implicit keep if all went well so far */
+	*keep = (status < SIEVE_EXEC_OK);
+
+	return status;
+}
+
+static void
+act_store_log_status(struct act_store_transaction *trans,
+		     const struct sieve_action_exec_env *aenv,
+		     bool rolled_back, bool status)
+{
+	const char *mailbox_name = trans->mailbox_name;
+	const char *mailbox_identifier = trans->mailbox_identifier;
+
+	if (trans->box != NULL) {
+		const char *mailbox_vname = str_sanitize(mailbox_get_vname(trans->box), 128);
+
+		if (strcmp(trans->mailbox_name, mailbox_vname) != 0) {
+			mailbox_identifier = t_strdup_printf(
+				"%s (%s)", mailbox_identifier,
+				str_sanitize(mailbox_vname, 256));
+		}
+	}
+
+	/* Store disabled? */
+	if (trans->disabled) {
+		sieve_result_global_log(aenv, "store into mailbox %s skipped",
+					mailbox_identifier);
+	/* Store redundant? */
+	} else if (trans->redundant) {
+		sieve_result_global_log(aenv, "left message in mailbox %s",
+					mailbox_identifier);
+	/* Store failed? */
+	} else if (!status) {
+		const char *errstr;
+		enum mail_error error_code;
+
+		if (trans->error == NULL)
+			sieve_act_store_get_storage_error(aenv, trans);
+
+		errstr = trans->error;
+		error_code = trans->error_code;
+
+		if (error_code == MAIL_ERROR_NOQUOTA) {
+			/* Never log quota problems as error in global log */
+			sieve_result_global_log_error(
+				aenv, "failed to store into mailbox %s: %s",
+				mailbox_identifier, errstr);
+		} else if (error_code == MAIL_ERROR_NOTFOUND ||
+			   error_code == MAIL_ERROR_PARAMS ||
+			   error_code == MAIL_ERROR_PERM) {
+			sieve_result_error(
+				aenv, "failed to store into mailbox %s: %s",
+				mailbox_identifier, errstr);
+		} else {
+			sieve_result_global_error(
+				aenv, "failed to store into mailbox %s: %s",
+				mailbox_identifier, errstr);
+		}
+	/* Store aborted? */
+	} else if (rolled_back) {
+		if (!aenv->action->keep) {
+			sieve_result_global_log(
+				aenv, "store into mailbox %s aborted",
+				mailbox_identifier);
+		} else {
+			e_debug(aenv->event, "Store into mailbox %s aborted",
+				mailbox_identifier);
+		}
+	/* Succeeded */
+	} else {
+		struct event_passthrough *e =
+			sieve_action_create_finish_event(aenv)->
+			add_str("fileinto_mailbox_name", mailbox_name)->
+			add_str("fileinto_mailbox", mailbox_identifier);
+		sieve_result_event_log(aenv, e->event(),
+				       "stored mail into mailbox %s",
+				       mailbox_identifier);
+	}
+}
+
+static void act_store_cleanup(struct act_store_transaction *trans)
+{
+	if (trans->mail_trans != NULL)
+		mailbox_transaction_rollback(&trans->mail_trans);
+	if (trans->box != NULL)
+		mailbox_free(&trans->box);
+}
+
+static int
+act_store_commit(const struct sieve_action_exec_env *aenv, void *tr_context)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct act_store_transaction *trans =
+		(struct act_store_transaction *)tr_context;
+	bool bail_out = FALSE, status = TRUE;
+	int ret = SIEVE_EXEC_OK;
+
+	/* Verify transaction */
+	if (trans == NULL)
+		return SIEVE_EXEC_FAILURE;
+
+	e_debug(aenv->event, "Commit storing into mailbox %s",
+		trans->mailbox_identifier);
+
+	/* Check whether we can commit this transaction */
+	if (trans->error_code != MAIL_ERROR_NONE) {
+		/* Transaction already failed */
+		bail_out = TRUE;
+		status = FALSE;
+		if (trans->error_code == MAIL_ERROR_TEMP)
+			ret = SIEVE_EXEC_TEMP_FAILURE;
+		else
+			ret = SIEVE_EXEC_FAILURE;
+	/* Check whether we need to do anything */
+	} else if (trans->disabled) {
+		/* Nothing to do */
+		bail_out = TRUE;
+	} else if (trans->redundant) {
+		/* This transaction is redundant */
+		bail_out = TRUE;
+		eenv->exec_status->keep_original = TRUE;
+		eenv->exec_status->message_saved = TRUE;
+	}
+	if (bail_out) {
+		act_store_log_status(trans, aenv, FALSE, status);
+		act_store_cleanup(trans);
+		return ret;
+	}
+
+	i_assert(trans->box != NULL);
+	i_assert(trans->mail_trans != NULL);
+
+	/* Mark attempt to use storage. Can only get here when all previous
+	   actions succeeded.
+	 */
+	eenv->exec_status->last_storage = mailbox_get_storage(trans->box);
+
+	/* Commit mailbox transaction */
+	status = (mailbox_transaction_commit(&trans->mail_trans) == 0);
+
+	/* Note the fact that the message was stored at least once */
+	if (status)
+		eenv->exec_status->message_saved = TRUE;
+	else
+		eenv->exec_status->store_failed = TRUE;
+
+	/* Log our status */
+	act_store_log_status(trans, aenv, FALSE, status);
+
+	/* Clean up */
+	act_store_cleanup(trans);
+
+	if (status)
+		return SIEVE_EXEC_OK;
+
+	return (trans->error_code == MAIL_ERROR_TEMP ?
+		SIEVE_EXEC_TEMP_FAILURE : SIEVE_EXEC_FAILURE);
+}
+
+static void
+act_store_rollback(const struct sieve_action_exec_env *aenv, void *tr_context,
+		   bool success)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct act_store_transaction *trans =
+		(struct act_store_transaction *)tr_context;
+
+	if (trans == NULL)
+		return;
+
+	e_debug(aenv->event, "Roll back storing into mailbox %s",
+		trans->mailbox_identifier);
+
+	i_assert(trans->box != NULL);
+
+	if (!success) {
+		eenv->exec_status->last_storage =
+			mailbox_get_storage(trans->box);
+		eenv->exec_status->store_failed = TRUE;
+	}
+
+	/* Log status */
+	act_store_log_status(trans, aenv, TRUE, success);
+
+	/* Rollback mailbox transaction and clean up */
+	act_store_cleanup(trans);
+}
+
+/*
+ * Redirect action
+ */
+
+int sieve_act_redirect_add_to_result(const struct sieve_runtime_env *renv,
+				     const char *name,
+				     struct sieve_side_effects_list *seffects,
+				     const struct smtp_address *to_address)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	struct sieve_instance *svinst = eenv->svinst;
+	struct act_redirect_context *act;
+	pool_t pool;
+
+	pool = sieve_result_pool(renv->result);
+	act = p_new(pool, struct act_redirect_context, 1);
+	act->to_address = smtp_address_clone(pool, to_address);
+
+	if (sieve_result_add_action(renv, NULL, name, &act_redirect, seffects,
+				    (void *)act, svinst->max_redirects,
+				    TRUE) < 0)
+		return SIEVE_EXEC_FAILURE;
+
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Action utility functions
+ */
+
+/* Rejecting the mail */
+
+static int
+sieve_action_do_reject_mail(const struct sieve_action_exec_env *aenv,
+			    const struct smtp_address *recipient,
+			    const char *reason)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct sieve_instance *svinst = eenv->svinst;
+	const struct sieve_script_env *senv = eenv->scriptenv;
+	const struct sieve_message_data *msgdata = eenv->msgdata;
+	const struct smtp_address *sender, *orig_recipient;
+	struct istream *input;
+	struct ostream *output;
+	struct sieve_smtp_context *sctx;
+	const char *new_msgid, *boundary, *error;
+	string_t *hdr;
+	int ret;
+
+	sender = sieve_message_get_sender(aenv->msgctx);
+	orig_recipient = msgdata->envelope.rcpt_params->orcpt.addr;
+
+	sctx = sieve_smtp_start_single(senv, sender, NULL, &output);
+
+	/* Just to be sure */
+	if (sctx == NULL) {
+		sieve_result_global_warning(
+			aenv, "reject action has no means to send mail");
+		return SIEVE_EXEC_OK;
+	}
+
+	new_msgid = sieve_message_get_new_id(svinst);
+	boundary = t_strdup_printf("%s/%s", my_pid, svinst->hostname);
+
+	hdr = t_str_new(512);
+	rfc2822_header_write(hdr, "X-Sieve", SIEVE_IMPLEMENTATION);
+	rfc2822_header_write(hdr, "Message-ID", new_msgid);
+	rfc2822_header_write(hdr, "Date", message_date_create(ioloop_time));
+	rfc2822_header_write(hdr, "From", sieve_get_postmaster_address(senv));
+	rfc2822_header_printf(hdr, "To", "<%s>", smtp_address_encode(sender));
+	rfc2822_header_write(hdr, "Subject", "Automatically rejected mail");
+	rfc2822_header_write(hdr, "Auto-Submitted", "auto-replied (rejected)");
+	rfc2822_header_write(hdr, "Precedence", "bulk");
+
+	rfc2822_header_write(hdr, "MIME-Version", "1.0");
+	rfc2822_header_printf(hdr, "Content-Type",
+			      "multipart/report; "
+			      "report-type=disposition-notification;\r\n"
+			      "boundary=\"%s\"", boundary);
+
+	str_append(hdr, "\r\nThis is a MIME-encapsulated message\r\n\r\n");
+
+	/* Human readable status report */
+	str_printfa(hdr, "--%s\r\n", boundary);
+	rfc2822_header_write(hdr, "Content-Type", "text/plain; charset=utf-8");
+	rfc2822_header_write(hdr, "Content-Disposition", "inline");
+	rfc2822_header_write(hdr, "Content-Transfer-Encoding", "8bit");
+
+	str_printfa(hdr, "\r\nYour message to <%s> was automatically rejected:\r\n"
+		    "%s\r\n", smtp_address_encode(recipient), reason);
+
+	/* MDN status report */
+	str_printfa(hdr, "--%s\r\n", boundary);
+	rfc2822_header_write(hdr, "Content-Type",
+			     "message/disposition-notification");
+	str_append(hdr, "\r\n");
+	rfc2822_header_write(hdr,
+			     "Reporting-UA: %s; Dovecot Mail Delivery Agent",
+			     svinst->hostname);	
+	if (orig_recipient != NULL) {
+		rfc2822_header_printf(hdr, "Original-Recipient", "rfc822; %s",
+				      smtp_address_encode(orig_recipient));
+	}
+	rfc2822_header_printf(hdr, "Final-Recipient", "rfc822; %s",
+			      smtp_address_encode(recipient));
+
+	if (msgdata->id != NULL)
+		rfc2822_header_write(hdr, "Original-Message-ID", msgdata->id);
+	rfc2822_header_write(hdr, "Disposition",
+		"automatic-action/MDN-sent-automatically; deleted");
+	str_append(hdr, "\r\n");
+
+	/* original message's headers */
+	str_printfa(hdr, "--%s\r\n", boundary);
+	rfc2822_header_write(hdr, "Content-Type", "message/rfc822");
+	str_append(hdr, "\r\n");
+	o_stream_nsend(output, str_data(hdr), str_len(hdr));
+
+	if (mail_get_hdr_stream(msgdata->mail, NULL, &input) == 0) {
+		/* NOTE: If you add more headers, they need to be sorted. We'll
+		   drop Content-Type because we're not including the message
+		   body, and having a multipart Content-Type may confuse some
+		   MIME parsers when they don't see the message boundaries.
+		 */
+		static const char *const exclude_headers[] = {
+			"Content-Type"
+		};
+
+		input = i_stream_create_header_filter(
+			input, HEADER_FILTER_EXCLUDE | HEADER_FILTER_NO_CR |
+			       HEADER_FILTER_HIDE_BODY,
+			exclude_headers, N_ELEMENTS(exclude_headers),
+			*null_header_filter_callback, (void *)NULL);
+		o_stream_nsend_istream(output, input);
+		i_stream_unref(&input);
+	}
+
+	str_truncate(hdr, 0);
+	str_printfa(hdr, "\r\n\r\n--%s--\r\n", boundary);
+	o_stream_nsend(output, str_data(hdr), str_len(hdr));
+
+	if ((ret = sieve_smtp_finish(sctx, &error)) <= 0) {
+		if (ret < 0) {
+			sieve_result_global_error(aenv,
+				"failed to send rejection message to <%s>: %s "
+				"(temporary failure)",
+				smtp_address_encode(sender),
+				str_sanitize(error, 512));
+		} else {
+			sieve_result_global_log_error(aenv,
+				"failed to send rejection message to <%s>: %s "
+				"(permanent failure)",
+				smtp_address_encode(sender),
+				str_sanitize(error, 512));
+		}
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	return SIEVE_EXEC_OK;
+}
+
+int sieve_action_reject_mail(const struct sieve_action_exec_env *aenv,
+			     const struct smtp_address *recipient,
+			     const char *reason)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	const struct sieve_script_env *senv = eenv->scriptenv;
+	int result;
+
+	T_BEGIN {
+		if (senv->reject_mail != NULL) {
+			result = (senv->reject_mail(senv, recipient,
+						    reason) >= 0 ?
+				  SIEVE_EXEC_OK : SIEVE_EXEC_FAILURE);
+		} else {
+			result = sieve_action_do_reject_mail(aenv, recipient,
+							     reason);
+		}
+	} T_END;
+
+	return result;
+}
+
+/*
+ * Mailbox
+ */
+
+bool sieve_mailbox_check_name(const char *mailbox, const char **error_r)
+{
+	if (!uni_utf8_str_is_valid(mailbox)) {
+		*error_r = "invalid utf-8";
+		return FALSE;
+	}
+	return TRUE;
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/sieve-actions.h b/pigeonhole/src/lib-sieve/sieve-actions.h
new file mode 100644
index 0000000..f1a447f
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-actions.h
@@ -0,0 +1,311 @@
+#ifndef SIEVE_ACTIONS_H
+#define SIEVE_ACTIONS_H
+
+#include "lib.h"
+#include "mail-types.h"
+#include "mail-error.h"
+
+#include "sieve-common.h"
+#include "sieve-objects.h"
+#include "sieve-extensions.h"
+#include "sieve-execute.h"
+
+/*
+ * Action execution environment
+ */
+
+struct sieve_action_exec_env {
+	const struct sieve_execute_env *exec_env;
+	struct sieve_result_execution *rexec;
+	const struct sieve_action *action;
+	struct event *event;
+
+	struct sieve_result *result;
+	struct sieve_error_handler *ehandler;
+
+	struct sieve_message_context *msgctx;
+};
+
+struct event_passthrough *
+sieve_action_create_finish_event(const struct sieve_action_exec_env *aenv);
+
+/*
+ * Action flags
+ */
+
+enum sieve_action_flags {
+	SIEVE_ACTFLAG_TRIES_DELIVER = (1 << 0),
+	SIEVE_ACTFLAG_SENDS_RESPONSE = (1 << 1),
+	SIEVE_ACTFLAG_MAIL_STORAGE = (1 << 2)
+};
+
+/*
+ * Action definition
+ */
+
+struct sieve_action_def {
+	const char *name;
+	unsigned int flags;
+
+	bool (*equals)(const struct sieve_script_env *senv,
+		       const struct sieve_action *act1,
+		       const struct sieve_action *act2);
+
+	/* Result verification */
+	int (*check_duplicate)(const struct sieve_runtime_env *renv,
+			       const struct sieve_action *act,
+			       const struct sieve_action *act_other);
+	int (*check_conflict)(const struct sieve_runtime_env *renv,
+			      const struct sieve_action *act,
+			      const struct sieve_action *act_other);
+
+	/* Result printing */
+	void (*print)(const struct sieve_action *action,
+		      const struct sieve_result_print_env *penv, bool *keep);
+
+	/* Result execution */
+	int (*start)(const struct sieve_action_exec_env *aenv,
+		     void **tr_context);
+	int (*execute)(const struct sieve_action_exec_env *aenv,
+		       void *tr_context, bool *keep);
+	int (*commit)(const struct sieve_action_exec_env *aenv,
+		      void *tr_context);
+	void (*rollback)(const struct sieve_action_exec_env *aenv,
+			 void *tr_context, bool success);
+	void (*finish)(const struct sieve_action_exec_env *aenv,
+		       void *tr_context, int status);
+};
+
+/*
+ * Action instance
+ */
+
+struct sieve_action {
+	const struct sieve_action_def *def;
+	const struct sieve_extension *ext;
+	struct event *event;
+
+	const char *name;
+	const char *location;
+	unsigned int exec_seq;
+	void *context;
+	struct mail *mail;
+
+	bool keep:1;
+};
+
+#define sieve_action_is(act, definition) ((act)->def == &(definition))
+#define sieve_action_name(act) ((act)->name)
+
+bool sieve_action_is_executed(const struct sieve_action *act,
+			      struct sieve_result *result);
+
+/*
+ * Action side effects
+ */
+
+/* Side effect object */
+
+struct sieve_side_effect_def {
+	struct sieve_object_def obj_def;
+
+	/* Precedence (side effects with higher value are executed first) */
+
+	unsigned int precedence;
+
+	/* The action it is supposed to link to */
+	const struct sieve_action_def *to_action;
+
+	/* Context coding */
+	bool (*dump_context)(const struct sieve_side_effect *seffect,
+			     const struct sieve_dumptime_env *renv,
+			     sieve_size_t *address);
+	int (*read_context)(const struct sieve_side_effect *seffect,
+			    const struct sieve_runtime_env *renv,
+			    sieve_size_t *address, void **se_context);
+
+	/* Result verification */
+	int (*merge)(const struct sieve_runtime_env *renv,
+		     const struct sieve_action *action,
+		     const struct sieve_side_effect *old_seffect,
+		     const struct sieve_side_effect *new_seffect,
+		     void **old_context);
+
+	/* Result printing */
+	void (*print)(const struct sieve_side_effect *seffect,
+		      const struct sieve_action *action,
+		      const struct sieve_result_print_env *penv, bool *keep);
+
+	/* Result execution */
+
+	int (*pre_execute)(const struct sieve_side_effect *seffect,
+			   const struct sieve_action_exec_env *aenv,
+			   void *tr_context, void **se_tr_context);
+	int (*post_execute)(const struct sieve_side_effect *seffect,
+			    const struct sieve_action_exec_env *aenv,
+			    void *tr_context, void *se_tr_context, bool *keep);
+	void (*post_commit)(const struct sieve_side_effect *seffect,
+			    const struct sieve_action_exec_env *aenv,
+			    void *tr_context, void *se_tr_context,
+			    int commit_status);
+	void (*rollback)(const struct sieve_side_effect *seffect,
+			 const struct sieve_action_exec_env *aenv,
+			 void *tr_context, void *se_tr_context, bool success);
+};
+
+struct sieve_side_effect {
+	struct sieve_object object;
+
+	const struct sieve_side_effect_def *def;
+
+	void *context;
+};
+
+/*
+ * Side effect operand
+ */
+
+#define SIEVE_EXT_DEFINE_SIDE_EFFECT(SEF) SIEVE_EXT_DEFINE_OBJECT(SEF)
+#define SIEVE_EXT_DEFINE_SIDE_EFFECTS(SEFS) SIEVE_EXT_DEFINE_OBJECTS(SEFS)
+
+#define SIEVE_OPT_SIDE_EFFECT (-1)
+
+extern const struct sieve_operand_class sieve_side_effect_operand_class;
+
+static inline void
+sieve_opr_side_effect_emit(struct sieve_binary_block *sblock,
+			   const struct sieve_extension *ext,
+			   const struct sieve_side_effect_def *seff)
+{
+	sieve_opr_object_emit(sblock, ext, &seff->obj_def);
+}
+
+bool sieve_opr_side_effect_dump(const struct sieve_dumptime_env *denv,
+				sieve_size_t *address);
+int sieve_opr_side_effect_read(const struct sieve_runtime_env *renv,
+			       sieve_size_t *address,
+			       struct sieve_side_effect *seffect);
+
+/*
+ * Optional operands
+ */
+
+int sieve_action_opr_optional_dump(const struct sieve_dumptime_env *denv,
+				   sieve_size_t *address, signed int *opt_code);
+
+int sieve_action_opr_optional_read(const struct sieve_runtime_env *renv,
+				   sieve_size_t *address, signed int *opt_code,
+				   int *exec_status,
+				   struct sieve_side_effects_list **list);
+
+/*
+ * Core actions
+ */
+
+extern const struct sieve_action_def act_redirect;
+extern const struct sieve_action_def act_store;
+extern const struct sieve_action_def act_discard;
+
+/*
+ * Store action
+ */
+
+struct act_store_context {
+	/* Folder name represented in utf-8 */
+	const char *mailbox;
+};
+
+struct act_store_transaction {
+	struct act_store_context *context;
+	struct mailbox *box;
+	struct mailbox_transaction_context *mail_trans;
+
+	const char *mailbox_name;
+	const char *mailbox_identifier;
+
+	const char *error;
+	enum mail_error error_code;
+
+	enum mail_flags flags;
+	ARRAY_TYPE(const_string) keywords;
+
+	bool flags_altered:1;
+	bool disabled:1;
+	bool redundant:1;
+};
+
+int sieve_act_store_add_to_result(const struct sieve_runtime_env *renv,
+				  const char *name,
+				  struct sieve_side_effects_list *seffects,
+				  const char *folder);
+
+void sieve_act_store_add_flags(const struct sieve_action_exec_env *aenv,
+			       void *tr_context, const char *const *keywords,
+			       enum mail_flags flags);
+
+void sieve_act_store_get_storage_error(const struct sieve_action_exec_env *aenv,
+				       struct act_store_transaction *trans);
+
+/*
+ * Redirect action
+ */
+
+struct act_redirect_context {
+	const struct smtp_address *to_address;
+};
+
+int sieve_act_redirect_add_to_result(const struct sieve_runtime_env *renv,
+				     const char *name,
+				     struct sieve_side_effects_list *seffects,
+				     const struct smtp_address *to_address);
+
+/*
+ * Checking for duplicates
+ */
+
+static inline bool
+sieve_action_duplicate_check_available(const struct sieve_action_exec_env *aenv)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+
+	return sieve_execute_duplicate_check_available(eenv);
+}
+
+static inline int
+sieve_action_duplicate_check(const struct sieve_action_exec_env *aenv,
+			     const void *id, size_t id_size,
+			     bool *duplicate_r)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+
+	return sieve_execute_duplicate_check(eenv, id, id_size,
+					     duplicate_r);
+}
+
+static inline void
+sieve_action_duplicate_mark(const struct sieve_action_exec_env *aenv,
+			    const void *id, size_t id_size, time_t time)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+
+	return sieve_execute_duplicate_mark(eenv, id, id_size, time);
+}
+
+/*
+ * Action utility functions
+ */
+
+/* Rejecting mail */
+
+int sieve_action_reject_mail(const struct sieve_action_exec_env *aenv,
+			     const struct smtp_address *recipient,
+			     const char *reason);
+
+/*
+ * Mailbox
+ */
+
+// FIXME: move this to a more appropriate location
+bool sieve_mailbox_check_name(const char *mailbox, const char **error_r);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-address-parts.c b/pigeonhole/src/lib-sieve/sieve-address-parts.c
new file mode 100644
index 0000000..a856e20
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-address-parts.c
@@ -0,0 +1,495 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "compat.h"
+#include "mempool.h"
+#include "hash.h"
+#include "array.h"
+#include "str-sanitize.h"
+
+#include "sieve-extensions.h"
+#include "sieve-code.h"
+#include "sieve-address.h"
+#include "sieve-commands.h"
+#include "sieve-binary.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-match.h"
+
+#include "sieve-address-parts.h"
+
+#include <string.h>
+
+/*
+ * Default address parts
+ */
+
+const struct sieve_address_part_def *sieve_core_address_parts[] = {
+	&all_address_part, &local_address_part, &domain_address_part
+};
+
+const unsigned int sieve_core_address_parts_count =
+	N_ELEMENTS(sieve_core_address_parts);
+
+/*
+ * Address-part 'extension'
+ */
+
+static bool addrp_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+
+const struct sieve_extension_def address_part_extension = {
+	.name = "@address-parts",
+	.validator_load = addrp_validator_load
+};
+
+/*
+ * Validator context:
+ *   name-based address-part registry.
+ */
+
+static struct sieve_validator_object_registry *_get_object_registry
+(struct sieve_validator *valdtr)
+{
+	struct sieve_instance *svinst;
+	const struct sieve_extension *adrp_ext;
+
+	svinst = sieve_validator_svinst(valdtr);
+	adrp_ext = sieve_get_address_part_extension(svinst);
+	return sieve_validator_object_registry_get(valdtr, adrp_ext);
+}
+
+void sieve_address_part_register
+(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+	const struct sieve_address_part_def *addrp_def)
+{
+	struct sieve_validator_object_registry *regs = _get_object_registry(valdtr);
+
+	sieve_validator_object_registry_add(regs, ext, &addrp_def->obj_def);
+}
+
+static bool sieve_address_part_exists
+(struct sieve_validator *valdtr, const char *identifier)
+{
+	struct sieve_validator_object_registry *regs = _get_object_registry(valdtr);
+
+	return sieve_validator_object_registry_find(regs, identifier, NULL);
+}
+
+static const struct sieve_address_part *sieve_address_part_create_instance
+(struct sieve_validator *valdtr, struct sieve_command *cmd,
+	const char *identifier)
+{
+	struct sieve_validator_object_registry *regs = _get_object_registry(valdtr);
+	struct sieve_object object;
+	struct sieve_address_part *addrp;
+
+	if ( !sieve_validator_object_registry_find(regs, identifier, &object) )
+		return NULL;
+
+	addrp = p_new(sieve_command_pool(cmd), struct sieve_address_part, 1);
+	addrp->object = object;
+	addrp->def = (const struct sieve_address_part_def *) object.def;
+
+  return addrp;
+}
+
+static bool addrp_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	struct sieve_validator_object_registry *regs =
+		sieve_validator_object_registry_init(valdtr, ext);
+	unsigned int i;
+
+	/* Register core address-parts */
+	for ( i = 0; i < sieve_core_address_parts_count; i++ ) {
+		sieve_validator_object_registry_add
+			(regs, NULL, &(sieve_core_address_parts[i]->obj_def));
+	}
+
+	return TRUE;
+}
+
+void sieve_address_parts_link_tags
+(struct sieve_validator *valdtr, struct sieve_command_registration *cmd_reg,
+	int id_code)
+{
+	struct sieve_instance *svinst;
+	const struct sieve_extension *adrp_ext;
+
+	svinst = sieve_validator_svinst(valdtr);
+	adrp_ext = sieve_get_address_part_extension(svinst);
+
+	sieve_validator_register_tag
+		(valdtr, cmd_reg, adrp_ext, &address_part_tag, id_code);
+}
+
+/*
+ * Address-part tagged argument
+ */
+
+/* Forward declarations */
+
+static bool tag_address_part_is_instance_of
+	(struct sieve_validator *valdtr, struct sieve_command *cmd,
+		const struct sieve_extension *ext, const char *identifier, void **data);
+static bool tag_address_part_validate
+	(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *cmd);
+static bool tag_address_part_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+		struct sieve_command *cmd);
+
+/* Argument object */
+
+const struct sieve_argument_def address_part_tag = {
+	.identifier = "ADDRESS-PART",
+	.is_instance_of = tag_address_part_is_instance_of,
+	.validate = tag_address_part_validate,
+	.generate = tag_address_part_generate
+};
+
+/* Argument implementation */
+
+static bool tag_address_part_is_instance_of
+(struct sieve_validator *valdtr, struct sieve_command *cmd,
+	const struct sieve_extension *ext ATTR_UNUSED, const char *identifier,
+	void **data)
+{
+	const struct sieve_address_part *addrp;
+
+	if ( data == NULL )
+		return sieve_address_part_exists(valdtr, identifier);
+
+	if ( (addrp=sieve_address_part_create_instance
+		(valdtr, cmd, identifier)) == NULL )
+		return FALSE;
+
+	*data = (void *) addrp;
+	return TRUE;
+}
+
+static bool tag_address_part_validate
+(struct sieve_validator *valdtr ATTR_UNUSED, struct sieve_ast_argument **arg,
+	struct sieve_command *cmd ATTR_UNUSED)
+{
+	/* NOTE: Currenly trivial, but might need to allow for further validation for
+	 * future extensions.
+	 */
+
+	/* Syntax:
+	 *   ":localpart" / ":domain" / ":all" (subject to extension)
+   	 */
+
+	/* Skip tag */
+	*arg = sieve_ast_argument_next(*arg);
+
+	return TRUE;
+}
+
+static bool tag_address_part_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+	struct sieve_command *cmd ATTR_UNUSED)
+{
+	struct sieve_address_part *addrp =
+		(struct sieve_address_part *) arg->argument->data;
+
+	sieve_opr_address_part_emit(cgenv->sblock, addrp);
+
+	return TRUE;
+}
+
+/*
+ * Address-part operand
+ */
+
+const struct sieve_operand_class sieve_address_part_operand_class =
+	{ "address part" };
+
+static const struct sieve_extension_objects core_address_parts =
+	SIEVE_EXT_DEFINE_MATCH_TYPES(sieve_core_address_parts);
+
+const struct sieve_operand_def address_part_operand = {
+	.name = "address-part",
+	.code = SIEVE_OPERAND_ADDRESS_PART,
+	.class = &sieve_address_part_operand_class,
+	.interface = &core_address_parts
+};
+
+/*
+ * Address-part string list
+ */
+
+static int sieve_address_part_stringlist_next_item
+	(struct sieve_stringlist *_strlist, string_t **str_r);
+static void sieve_address_part_stringlist_reset
+	(struct sieve_stringlist *_strlist);
+static int sieve_address_part_stringlist_get_length
+	(struct sieve_stringlist *_strlist);
+static void sieve_address_part_stringlist_set_trace
+(struct sieve_stringlist *_strlist, bool trace);
+
+struct sieve_address_part_stringlist {
+	struct sieve_stringlist strlist;
+
+	const struct sieve_address_part *addrp;
+	struct sieve_address_list *addresses;
+};
+
+struct sieve_stringlist *sieve_address_part_stringlist_create
+(const struct sieve_runtime_env *renv, const struct sieve_address_part *addrp,
+	struct sieve_address_list *addresses)
+{
+	struct sieve_address_part_stringlist *strlist;
+
+	strlist = t_new(struct sieve_address_part_stringlist, 1);
+	strlist->strlist.runenv = renv;
+	strlist->strlist.next_item = sieve_address_part_stringlist_next_item;
+	strlist->strlist.reset = sieve_address_part_stringlist_reset;
+	strlist->strlist.get_length = sieve_address_part_stringlist_get_length;
+	strlist->strlist.set_trace = sieve_address_part_stringlist_set_trace;
+
+	strlist->addrp = addrp;
+	strlist->addresses = addresses;
+
+	return &strlist->strlist;
+}
+
+static int sieve_address_part_stringlist_next_item
+	(struct sieve_stringlist *_strlist, string_t **str_r)
+{
+	struct sieve_address_part_stringlist *strlist =
+		(struct sieve_address_part_stringlist *)_strlist;
+	struct smtp_address item;
+	string_t *item_unparsed;
+	int ret;
+
+	*str_r = NULL;
+
+	while ( *str_r == NULL ) {
+		if ( (ret=sieve_address_list_next_item
+			(strlist->addresses, &item, &item_unparsed)) <= 0 )
+			return ret;
+
+		if ( item.localpart == NULL ) {
+			if ( item_unparsed != NULL ) {
+				if ( _strlist->trace ) {
+					sieve_runtime_trace(_strlist->runenv, 0,
+						"extracting `%s' part from non-address value `%s'",
+						sieve_address_part_name(strlist->addrp),
+						str_sanitize(str_c(item_unparsed), 80));
+				}
+
+				if ( str_len(item_unparsed) == 0 ||
+					sieve_address_part_is(strlist->addrp, all_address_part) )
+					*str_r = item_unparsed;
+			}
+		} else {
+			const struct sieve_address_part *addrp = strlist->addrp;
+			const char *part = NULL;
+
+			if ( _strlist->trace ) {
+				sieve_runtime_trace(_strlist->runenv, 0,
+					"extracting `%s' part from address %s",
+					sieve_address_part_name(strlist->addrp),
+					smtp_address_encode_path(&item));
+			}
+
+			if ( addrp->def != NULL && addrp->def->extract_from != NULL )
+				part = addrp->def->extract_from(addrp, &item);
+
+			if ( part != NULL )
+				*str_r = t_str_new_const(part, strlen(part));
+		}
+	}
+
+	return 1;
+}
+
+static void sieve_address_part_stringlist_reset
+	(struct sieve_stringlist *_strlist)
+{
+	struct sieve_address_part_stringlist *strlist =
+		(struct sieve_address_part_stringlist *)_strlist;
+
+	sieve_address_list_reset(strlist->addresses);
+}
+
+static int sieve_address_part_stringlist_get_length
+	(struct sieve_stringlist *_strlist)
+{
+	struct sieve_address_part_stringlist *strlist =
+		(struct sieve_address_part_stringlist *)_strlist;
+
+	return sieve_address_list_get_length(strlist->addresses);
+}
+
+static void sieve_address_part_stringlist_set_trace
+(struct sieve_stringlist *_strlist, bool trace)
+{
+	struct sieve_address_part_stringlist *strlist =
+		(struct sieve_address_part_stringlist *)_strlist;
+
+	sieve_address_list_set_trace(strlist->addresses, trace);
+}
+
+/*
+ * Default ADDRESS-PART, MATCH-TYPE, COMPARATOR access
+ */
+
+int sieve_addrmatch_opr_optional_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address,
+	signed int *opt_code)
+{
+	signed int _opt_code = 0;
+	bool final = FALSE, opok = TRUE;
+
+	if ( opt_code == NULL ) {
+		opt_code = &_opt_code;
+		final = TRUE;
+	}
+
+	while ( opok ) {
+		int opt;
+
+		if ( (opt=sieve_opr_optional_dump(denv, address, opt_code)) <= 0 )
+			return opt;
+
+		switch ( *opt_code ) {
+		case SIEVE_MATCH_OPT_COMPARATOR:
+			opok = sieve_opr_comparator_dump(denv, address);
+			break;
+		case SIEVE_MATCH_OPT_MATCH_TYPE:
+			opok = sieve_opr_match_type_dump(denv, address);
+			break;
+		case SIEVE_AM_OPT_ADDRESS_PART:
+			opok = sieve_opr_address_part_dump(denv, address);
+			break;
+		default:
+			return ( final ? -1 : 1 );
+		}
+	}
+
+	return -1;
+}
+
+int sieve_addrmatch_opr_optional_read
+(const struct sieve_runtime_env *renv, sieve_size_t *address,
+	signed int *opt_code, int *exec_status, struct sieve_address_part *addrp,
+	struct sieve_match_type *mtch, struct sieve_comparator *cmp)
+{
+	signed int _opt_code = 0;
+	bool final = FALSE;
+	int status = SIEVE_EXEC_OK;
+
+	if ( opt_code == NULL ) {
+		opt_code = &_opt_code;
+		final = TRUE;
+	}
+
+	if ( exec_status != NULL )
+		*exec_status = SIEVE_EXEC_OK;
+
+	while ( status == SIEVE_EXEC_OK ) {
+		int opt;
+
+		if ( (opt=sieve_opr_optional_read(renv, address, opt_code)) <= 0 ){
+			if ( opt < 0 && exec_status != NULL )
+				*exec_status = SIEVE_EXEC_BIN_CORRUPT;
+			return opt;
+		}
+
+		switch ( *opt_code ) {
+		case SIEVE_MATCH_OPT_COMPARATOR:
+			if (cmp == NULL) {
+				sieve_runtime_trace_error(renv, "unexpected comparator operand");
+				if ( exec_status != NULL )
+					*exec_status = SIEVE_EXEC_BIN_CORRUPT;
+				return -1;
+			}
+			status = sieve_opr_comparator_read(renv, address, cmp);
+			break;
+		case SIEVE_MATCH_OPT_MATCH_TYPE:
+			if (mtch == NULL) {
+				sieve_runtime_trace_error(renv, "unexpected match-type operand");
+				if ( exec_status != NULL )
+					*exec_status = SIEVE_EXEC_BIN_CORRUPT;
+				return -1;
+			}
+			status = sieve_opr_match_type_read(renv, address, mtch);
+			break;
+		case SIEVE_AM_OPT_ADDRESS_PART:
+			if (addrp == NULL) {
+				sieve_runtime_trace_error(renv, "unexpected address-part operand");
+				if ( exec_status != NULL )
+					*exec_status = SIEVE_EXEC_BIN_CORRUPT;
+				return -1;
+			}
+			status = sieve_opr_address_part_read(renv, address, addrp);
+			break;
+		default:
+			if ( final ) {
+				sieve_runtime_trace_error(renv, "invalid optional operand");
+				if ( exec_status != NULL )
+					*exec_status = SIEVE_EXEC_BIN_CORRUPT;
+				return -1;
+			}
+			return 1;
+		}
+	}
+
+	if ( exec_status != NULL )
+		*exec_status = status;
+	return -1;
+}
+
+/*
+ * Core address-part modifiers
+ */
+
+static const char *addrp_all_extract_from
+(const struct sieve_address_part *addrp ATTR_UNUSED,
+	const struct smtp_address *address)
+{
+	if ( address->localpart == NULL )
+		return NULL;
+	return smtp_address_encode(address);
+}
+
+static const char *addrp_domain_extract_from
+(const struct sieve_address_part *addrp ATTR_UNUSED,
+	const struct smtp_address *address)
+{
+	return address->domain;
+}
+
+static const char *addrp_localpart_extract_from
+(const struct sieve_address_part *addrp ATTR_UNUSED,
+	const struct smtp_address *address)
+{
+	return address->localpart;
+}
+
+const struct sieve_address_part_def all_address_part = {
+	SIEVE_OBJECT("all",
+		&address_part_operand, SIEVE_ADDRESS_PART_ALL),
+	.extract_from = addrp_all_extract_from
+};
+
+const struct sieve_address_part_def local_address_part = {
+	SIEVE_OBJECT("localpart",
+		&address_part_operand, SIEVE_ADDRESS_PART_LOCAL),
+	.extract_from = addrp_localpart_extract_from
+};
+
+const struct sieve_address_part_def domain_address_part = {
+	SIEVE_OBJECT("domain",
+		&address_part_operand,	SIEVE_ADDRESS_PART_DOMAIN),
+	.extract_from = addrp_domain_extract_from
+};
+
diff --git a/pigeonhole/src/lib-sieve/sieve-address-parts.h b/pigeonhole/src/lib-sieve/sieve-address-parts.h
new file mode 100644
index 0000000..c774dc3
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-address-parts.h
@@ -0,0 +1,135 @@
+#ifndef SIEVE_ADDRESS_PARTS_H
+#define SIEVE_ADDRESS_PARTS_H
+
+#include "message-address.h"
+
+#include "sieve-common.h"
+#include "sieve-match.h"
+#include "sieve-extensions.h"
+#include "sieve-objects.h"
+
+/*
+ * Address part definition
+ */
+
+struct sieve_address_part_def {
+	struct sieve_object_def obj_def;
+
+	const char *(*extract_from)
+		(const struct sieve_address_part *addrp,
+			const struct smtp_address *address);
+};
+
+/*
+ * Address part instance
+ */
+
+struct sieve_address_part {
+	struct sieve_object object;
+
+	const struct sieve_address_part_def *def;
+};
+
+#define SIEVE_ADDRESS_PART_DEFAULT(definition) \
+	{ SIEVE_OBJECT_DEFAULT(definition), &(definition) };
+
+#define sieve_address_part_name(addrp) \
+	( (addrp)->object.def->identifier )
+#define sieve_address_part_is(addrp, definition) \
+	( (addrp)->def == &(definition) )
+
+/*
+ * Core address parts
+ */
+
+enum sieve_address_part_code {
+	SIEVE_ADDRESS_PART_ALL,
+	SIEVE_ADDRESS_PART_LOCAL,
+	SIEVE_ADDRESS_PART_DOMAIN,
+	SIEVE_ADDRESS_PART_CUSTOM
+};
+
+extern const struct sieve_address_part_def all_address_part;
+extern const struct sieve_address_part_def local_address_part;
+extern const struct sieve_address_part_def domain_address_part;
+
+/*
+ * Address part tagged argument
+ */
+
+extern const struct sieve_argument_def address_part_tag;
+
+void sieve_address_parts_link_tags
+	(struct sieve_validator *valdtr, struct sieve_command_registration *cmd_reg,
+		int id_code);
+
+/*
+ * Address part registry
+ */
+
+void sieve_address_part_register
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		const struct sieve_address_part_def *addrp);
+
+/*
+ * Address part operand
+ */
+
+extern const struct sieve_operand_def address_part_operand;
+extern const struct sieve_operand_class sieve_address_part_operand_class;
+
+#define SIEVE_EXT_DEFINE_ADDRESS_PART(OP) SIEVE_EXT_DEFINE_OBJECT(OP)
+#define SIEVE_EXT_DEFINE_ADDRESS_PARTS(OPS) SIEVE_EXT_DEFINE_OBJECTS(OPS)
+
+static inline void sieve_opr_address_part_emit
+(struct sieve_binary_block *sblock, const struct sieve_address_part *addrp)
+{
+	sieve_opr_object_emit(sblock, addrp->object.ext, addrp->object.def);
+}
+
+static inline bool sieve_opr_address_part_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	return sieve_opr_object_dump
+		(denv, &sieve_address_part_operand_class, address, NULL);
+}
+
+static inline int sieve_opr_address_part_read
+(const struct sieve_runtime_env *renv, sieve_size_t *address,
+	struct sieve_address_part *addrp)
+{
+	if ( !sieve_opr_object_read
+		(renv, &sieve_address_part_operand_class, address, &addrp->object) )
+		return SIEVE_EXEC_BIN_CORRUPT;
+
+	addrp->def = (const struct sieve_address_part_def *) addrp->object.def;
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Address-part string list
+ */
+
+struct sieve_stringlist *sieve_address_part_stringlist_create
+	(const struct sieve_runtime_env *renv, const struct sieve_address_part *addrp,
+		struct sieve_address_list *addresses);
+
+/*
+ * Match utility
+ */
+
+enum sieve_addrmatch_opt_operand {
+	SIEVE_AM_OPT_ADDRESS_PART = SIEVE_MATCH_OPT_LAST,
+	SIEVE_AM_OPT_LAST
+};
+
+int sieve_addrmatch_opr_optional_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address,
+		signed int *opt_code);
+
+int sieve_addrmatch_opr_optional_read
+	(const struct sieve_runtime_env *renv, sieve_size_t *address,
+		signed int *opt_code, int *exec_status, struct sieve_address_part *addrp,
+		struct sieve_match_type *mtch, struct sieve_comparator *cmp);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-address-source.c b/pigeonhole/src/lib-sieve/sieve-address-source.c
new file mode 100644
index 0000000..a5ec6f6
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-address-source.c
@@ -0,0 +1,119 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+#include "sieve-settings.h"
+#include "sieve-address.h"
+#include "sieve-message.h"
+
+#include "sieve-address-source.h"
+
+bool sieve_address_source_parse
+(pool_t pool, const char *value,
+	struct sieve_address_source *asrc)
+{
+	struct smtp_address *address;
+	const char *error;
+	size_t val_len;
+
+	i_zero(asrc);
+
+	value = t_str_trim(value, "\t ");
+	value = t_str_lcase(value);
+	val_len = strlen(value);
+	if ( val_len > 0 ) {
+		if ( strcmp(value, "default") == 0 ) {
+			asrc->type = SIEVE_ADDRESS_SOURCE_DEFAULT;
+		} else if ( strcmp(value, "sender") == 0 ) {
+			asrc->type = SIEVE_ADDRESS_SOURCE_SENDER;
+		} else if ( strcmp(value, "recipient") == 0 ) {
+			asrc->type = SIEVE_ADDRESS_SOURCE_RECIPIENT;
+		} else if ( strcmp(value, "orig_recipient") == 0 ) {
+			asrc->type = SIEVE_ADDRESS_SOURCE_ORIG_RECIPIENT;
+		} else if ( strcmp(value, "user_email") == 0 ) {
+			asrc->type = SIEVE_ADDRESS_SOURCE_USER_EMAIL;
+		} else if ( strcmp(value, "postmaster") == 0 ) {
+			asrc->type = SIEVE_ADDRESS_SOURCE_POSTMASTER;
+		} else if ( smtp_address_parse_path(pool_datastack_create(), value,
+			SMTP_ADDRESS_PARSE_FLAG_ALLOW_EMPTY, &address, &error) >= 0 ) {
+			asrc->type = SIEVE_ADDRESS_SOURCE_EXPLICIT;
+			asrc->address = smtp_address_clone(pool, address);
+		} else {
+			return FALSE;
+		}
+	}
+	return TRUE;
+}
+
+bool sieve_address_source_parse_from_setting
+(struct sieve_instance *svinst, pool_t pool,
+	const char *setting, struct sieve_address_source *asrc)
+{
+	const char *value;
+
+	value = sieve_setting_get(svinst, setting);
+	if ( value == NULL )
+		return FALSE;
+
+	if ( !sieve_address_source_parse(pool, value, asrc) ) {
+		e_warning(svinst->event, "Invalid value for setting '%s': '%s'",
+			  setting, value);
+		return FALSE;
+	}
+	return TRUE;
+}
+
+int sieve_address_source_get_address
+(struct sieve_address_source *asrc,
+	struct sieve_instance *svinst,
+	const struct sieve_script_env *senv,
+	struct sieve_message_context *msgctx,
+	enum sieve_execute_flags flags,
+	const struct smtp_address **addr_r)
+{
+	enum sieve_address_source_type type = asrc->type;
+
+	if ( type == SIEVE_ADDRESS_SOURCE_USER_EMAIL &&
+		svinst->user_email == NULL )
+		type = SIEVE_ADDRESS_SOURCE_RECIPIENT;
+
+	if ( (flags & SIEVE_EXECUTE_FLAG_NO_ENVELOPE) != 0 ) {
+		switch ( type ) {
+		case SIEVE_ADDRESS_SOURCE_SENDER:
+		case SIEVE_ADDRESS_SOURCE_RECIPIENT:
+		case SIEVE_ADDRESS_SOURCE_ORIG_RECIPIENT:
+			/* We have no envelope */
+			type = SIEVE_ADDRESS_SOURCE_DEFAULT;
+			break;
+		default:
+			break;
+		}
+	}
+
+	switch ( type ) {
+	case SIEVE_ADDRESS_SOURCE_SENDER:
+		*addr_r = sieve_message_get_sender(msgctx);
+		return 1;
+	case SIEVE_ADDRESS_SOURCE_RECIPIENT:
+		*addr_r = sieve_message_get_final_recipient(msgctx);
+		return 1;
+	case SIEVE_ADDRESS_SOURCE_ORIG_RECIPIENT:
+		*addr_r = sieve_message_get_orig_recipient(msgctx);
+		return 1;
+	case SIEVE_ADDRESS_SOURCE_USER_EMAIL:
+		*addr_r = svinst->user_email;
+		return 1;
+	case SIEVE_ADDRESS_SOURCE_POSTMASTER:
+		*addr_r = sieve_get_postmaster_smtp(senv);
+		return 1;
+	case SIEVE_ADDRESS_SOURCE_EXPLICIT:
+		*addr_r = asrc->address;
+		return 1;
+	case SIEVE_ADDRESS_SOURCE_DEFAULT:
+		break;
+	}
+	return 0;
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-address-source.h b/pigeonhole/src/lib-sieve/sieve-address-source.h
new file mode 100644
index 0000000..fac4b49
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-address-source.h
@@ -0,0 +1,36 @@
+#ifndef SIEVE_ADDRESS_SOURCE_H
+#define SIEVE_ADDRESS_SOURCE_H
+
+#include "sieve-common.h"
+
+enum sieve_address_source_type {
+	SIEVE_ADDRESS_SOURCE_DEFAULT = 0,
+	SIEVE_ADDRESS_SOURCE_SENDER,
+	SIEVE_ADDRESS_SOURCE_RECIPIENT,
+	SIEVE_ADDRESS_SOURCE_ORIG_RECIPIENT,
+	SIEVE_ADDRESS_SOURCE_USER_EMAIL,
+	SIEVE_ADDRESS_SOURCE_POSTMASTER,
+	SIEVE_ADDRESS_SOURCE_EXPLICIT
+};
+
+struct sieve_address_source {
+	enum sieve_address_source_type type;
+	const struct smtp_address *address;
+};
+
+bool sieve_address_source_parse
+	(pool_t pool, const char *value,
+		struct sieve_address_source *asrc);
+bool sieve_address_source_parse_from_setting
+	(struct sieve_instance *svinst, pool_t pool,
+		const char *setting, struct sieve_address_source *asrc);
+
+int sieve_address_source_get_address
+	(struct sieve_address_source *asrc,
+		struct sieve_instance *svinst,
+		const struct sieve_script_env *senv,
+		struct sieve_message_context *msgctx,
+		enum sieve_execute_flags flags,
+		const struct smtp_address **addr_r);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-address.c b/pigeonhole/src/lib-sieve/sieve-address.c
new file mode 100644
index 0000000..f9456f8
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-address.c
@@ -0,0 +1,558 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "rfc822-parser.h"
+#include "message-address.h"
+
+#include "sieve-common.h"
+#include "sieve-runtime-trace.h"
+
+#include "sieve-address.h"
+
+#include <ctype.h>
+
+/*
+ * Header address list
+ */
+
+/* Forward declarations */
+
+static int
+sieve_header_address_list_next_string_item(struct sieve_stringlist *_strlist,
+					   string_t **str_r);
+static int
+sieve_header_address_list_next_item(struct sieve_address_list *_addrlist,
+				    struct smtp_address *addr_r,
+				    string_t **unparsed_r);
+static void
+sieve_header_address_list_reset(struct sieve_stringlist *_strlist);
+static void
+sieve_header_address_list_set_trace(struct sieve_stringlist *_strlist,
+				    bool trace);
+
+/* Stringlist object */
+
+struct sieve_header_address_list {
+	struct sieve_address_list addrlist;
+
+	struct sieve_stringlist *field_values;
+	const struct message_address *cur_address;
+};
+
+struct sieve_address_list *
+sieve_header_address_list_create(const struct sieve_runtime_env *renv,
+				 struct sieve_stringlist *field_values)
+{
+	struct sieve_header_address_list *addrlist;
+
+	addrlist = t_new(struct sieve_header_address_list, 1);
+	addrlist->addrlist.strlist.runenv = renv;
+	addrlist->addrlist.strlist.exec_status = SIEVE_EXEC_OK;
+	addrlist->addrlist.strlist.next_item =
+		sieve_header_address_list_next_string_item;
+	addrlist->addrlist.strlist.reset = sieve_header_address_list_reset;
+	addrlist->addrlist.strlist.set_trace =
+		sieve_header_address_list_set_trace;
+	addrlist->addrlist.next_item = sieve_header_address_list_next_item;
+	addrlist->field_values = field_values;
+
+	return &addrlist->addrlist;
+}
+
+static int
+sieve_header_address_list_next_address(
+	struct sieve_header_address_list *addrlist, struct smtp_address *addr_r)
+{
+	struct smtp_address adummy;
+	int ret = 0;
+
+	if (addr_r == NULL)
+		addr_r = &adummy;
+
+	while (addrlist->cur_address != NULL) {
+		const struct message_address *aitem = addrlist->cur_address;
+
+		addrlist->cur_address = addrlist->cur_address->next;
+
+		if (!aitem->invalid_syntax && aitem->domain != NULL &&
+		    smtp_address_init_from_msg(addr_r, aitem) >= 0)
+			return 1;
+		ret = -1;
+	}
+	return ret;
+}
+
+static int
+sieve_header_address_list_next_item(struct sieve_address_list *_addrlist,
+				    struct smtp_address *addr_r,
+				    string_t **unparsed_r)
+{
+	struct sieve_header_address_list *addrlist =
+		(struct sieve_header_address_list *)_addrlist;
+	const struct sieve_runtime_env *runenv = _addrlist->strlist.runenv;
+	string_t *value_item = NULL;
+	bool trace = _addrlist->strlist.trace;
+
+	if (addr_r != NULL)
+		smtp_address_init(addr_r, NULL, NULL);
+	if (unparsed_r != NULL)
+		*unparsed_r = NULL;
+
+	for (;;) {
+		int ret;
+
+		if ((ret = sieve_header_address_list_next_address(
+			addrlist, addr_r)) < 0 &&
+		    value_item != NULL) {
+			/* completely invalid address list is returned as-is */
+			if (trace) {
+				sieve_runtime_trace(
+					runenv, 0,
+					"invalid address value `%s'",
+					str_sanitize(str_c(value_item), 80));
+			}
+			if (unparsed_r != NULL)
+				*unparsed_r = value_item;
+			return 1;
+		}
+		if (ret > 0) {
+			if (trace) {
+				sieve_runtime_trace(
+					runenv, 0,
+					"address value `%s'",
+					str_sanitize(smtp_address_encode(addr_r),
+						     80));
+			}
+			return 1;
+		}
+
+		/* Read next header value from source list */
+		if ((ret = sieve_stringlist_next_item(addrlist->field_values,
+						      &value_item)) <= 0)
+			return ret;
+		if (str_len(value_item) == 0) {
+			/* empty header value is returned as-is */
+			if (trace) {
+				sieve_runtime_trace(runenv, 0,
+						    "empty address value");
+			}
+			addrlist->cur_address = NULL;
+			if (unparsed_r != NULL)
+				*unparsed_r = value_item;
+			return 1;
+		}
+
+		if (trace) {
+			sieve_runtime_trace(
+				runenv, 0,
+				"parsing address header value `%s'",
+				str_sanitize(str_c(value_item), 80));
+		}
+
+		addrlist->cur_address = message_address_parse(
+			pool_datastack_create(),
+			(const unsigned char *)str_data(value_item),
+			str_len(value_item), 256, 0);
+	}
+	i_unreached();
+}
+
+static int
+sieve_header_address_list_next_string_item(struct sieve_stringlist *_strlist,
+					   string_t **str_r)
+{
+	struct sieve_address_list *addrlist =
+		(struct sieve_address_list *)_strlist;
+	struct smtp_address addr;
+	int ret;
+
+	if ((ret = sieve_header_address_list_next_item(
+		addrlist, &addr, str_r)) <= 0)
+		return ret;
+
+	if (addr.localpart != NULL) {
+		const char *addr_str = smtp_address_encode(&addr);
+
+		if (str_r != NULL)
+			*str_r = t_str_new_const(addr_str, strlen(addr_str));
+	}
+	return 1;
+}
+
+static void sieve_header_address_list_reset(struct sieve_stringlist *_strlist)
+{
+	struct sieve_header_address_list *addrlist =
+		(struct sieve_header_address_list *)_strlist;
+
+	sieve_stringlist_reset(addrlist->field_values);
+	addrlist->cur_address = NULL;
+}
+
+static void
+sieve_header_address_list_set_trace(struct sieve_stringlist *_strlist,
+				    bool trace)
+{
+	struct sieve_header_address_list *addrlist =
+		(struct sieve_header_address_list *)_strlist;
+
+	sieve_stringlist_set_trace(addrlist->field_values, trace);
+}
+
+/*
+ * RFC 2822 addresses
+ */
+
+/* Mail message address according to RFC 2822 and implemented in the Dovecot
+   message address parser:
+
+     address         =       mailbox / group
+     mailbox         =       name-addr / addr-spec
+     name-addr       =       [display-name] angle-addr
+     angle-addr      =       [CFWS] "<" addr-spec ">" [CFWS] / obs-angle-addr
+     group           =       display-name ":" [mailbox-list / CFWS] ";" [CFWS]
+     display-name    =       phrase
+
+     addr-spec       =       local-part "@" domain
+     local-part      =       dot-atom / quoted-string / obs-local-part
+     domain          =       dot-atom / domain-literal / obs-domain
+     domain-literal  =       [CFWS] "[" *([FWS] dcontent) [FWS] "]" [CFWS]
+     dcontent        =       dtext / quoted-pair
+     dtext           =       NO-WS-CTL /     ; Non white space controls
+                             %d33-90 /       ; The rest of the US-ASCII
+                             %d94-126        ;  characters not including "[",
+                                             ;  "]", or "\"
+
+     atext           =       ALPHA / DIGIT / ; Any character except controls,
+                            "!" / "#" /     ;  SP, and specials.
+                             "$" / "%" /     ;  Used for atoms
+                             "&" / "'" /
+                             "*" / "+" /
+                             "-" / "/" /
+                             "=" / "?" /
+                             "^" / "_" /
+                             "`" / "{" /
+                             "|" / "}" /
+                             "~"
+     atom            =       [CFWS] 1*atext [CFWS]
+     dot-atom        =       [CFWS] dot-atom-text [CFWS]
+     dot-atom-text   =       1*atext *("." 1*atext)
+     word            =       atom / quoted-string
+     phrase          =       1*word / obs-phrase
+
+   Message address specification as allowed bij the RFC 5228 SIEVE
+   specification:
+     sieve-address   =       addr-spec                  ; simple address
+                             / phrase "<" addr-spec ">" ; name & addr-spec\
+
+   Which concisely is about equal to:
+     sieve-address   =       mailbox
+ */
+
+/*
+ * Address parse context
+ */
+
+struct sieve_message_address_parser {
+	struct rfc822_parser_context parser;
+
+	string_t *str;
+	string_t *local_part;
+	string_t *domain;
+
+	string_t *error;
+};
+
+/*
+ * Error handling
+ */
+
+static inline void ATTR_FORMAT(2, 3)
+sieve_address_error(struct sieve_message_address_parser *ctx,
+		    const char *fmt, ...)
+{
+	va_list args;
+
+	if (str_len(ctx->error) == 0) {
+		va_start(args, fmt);
+		str_vprintfa(ctx->error, fmt, args);
+		va_end(args);
+	}
+}
+
+/*
+   Partial RFC 2822 address parser
+
+     FIXME: lots of overlap with dovecot/src/lib-mail/message-parser.c
+            --> this implementation adds textual error reporting
+            MERGE!
+ */
+
+static int check_local_part(struct sieve_message_address_parser *ctx)
+{
+	const unsigned char *p, *pend;
+
+	p = str_data(ctx->local_part);
+	pend = p + str_len(ctx->local_part);
+	while (p < pend) {
+		if (*p < 0x20 || *p > 0x7e)
+			return -1;
+		p++;
+	}
+	return 0;
+}
+
+static int parse_local_part(struct sieve_message_address_parser *ctx)
+{
+	int ret;
+
+	/*
+	   local-part      = dot-atom / quoted-string / obs-local-part
+	   obs-local-part  = word *("." word)
+	*/
+	if (ctx->parser.data == ctx->parser.end) {
+		sieve_address_error(ctx, "empty local part");
+		return -1;
+	}
+
+	str_truncate(ctx->local_part, 0);
+	if (*ctx->parser.data == '"') {
+		ret = rfc822_parse_quoted_string(&ctx->parser, ctx->local_part);
+	} else {
+		ret = -1;
+		/* NOTE: this deviates from dot-atom syntax to allow some
+		   Japanese mail addresses with dots at non-standard places to
+		   be accepted. */
+		do {
+			while (*ctx->parser.data == '.') {
+				str_append_c(ctx->local_part, '.');
+				ctx->parser.data++;
+				if (ctx->parser.data == ctx->parser.end) {
+					/* @domain is missing, but local-part
+					   parsing was successful */
+					return 0;
+				}
+				ret = 1;
+			}
+			if (*ctx->parser.data == '@')
+				break;
+			ret = rfc822_parse_atom(&ctx->parser, ctx->local_part);
+		} while (ret > 0 && *ctx->parser.data == '.');
+	}
+
+	if (ret < 0 || check_local_part(ctx) < 0) {
+		sieve_address_error(ctx, "invalid local part");
+		return -1;
+	}
+	return ret;
+}
+
+static int parse_domain(struct sieve_message_address_parser *ctx)
+{
+	int ret;
+
+	str_truncate(ctx->domain, 0);
+	if ((ret = rfc822_parse_domain(&ctx->parser, ctx->domain)) < 0) {
+		sieve_address_error(ctx, "invalid or missing domain");
+		return -1;
+	}
+
+	return ret;
+}
+
+static int parse_addr_spec(struct sieve_message_address_parser *ctx)
+{
+	/* addr-spec       = local-part "@" domain */
+	int ret;
+
+	if ((ret = parse_local_part(ctx)) < 0)
+		return ret;
+
+	if (ret > 0 && *ctx->parser.data == '@') {
+		return parse_domain(ctx);
+	}
+
+	sieve_address_error(
+		ctx, "invalid or lonely local part '%s' (expecting '@')",
+		str_sanitize(str_c(ctx->local_part), 80));
+	return -1;
+}
+
+static int parse_mailbox(struct sieve_message_address_parser *ctx)
+{
+	int ret;
+	const unsigned char *start;
+
+	/* sieve-address   =       addr-spec                  ; simple address
+	                           / phrase "<" addr-spec ">" ; name & addr-spec
+	 */
+
+	/* Record parser state in case we fail at our first attempt */
+	start = ctx->parser.data;
+
+	/* First try: phrase "<" addr-spec ">" ; name & addr-spec */
+	str_truncate(ctx->str, 0);
+	if (rfc822_parse_phrase(&ctx->parser, ctx->str) <= 0 ||
+	    *ctx->parser.data != '<') {
+		/* Failed; try just bare addr-spec */
+		ctx->parser.data = start;
+		return parse_addr_spec(ctx);
+	}
+
+	/* "<" addr-spec ">" */
+	ctx->parser.data++;
+
+	if ((ret = rfc822_skip_lwsp(&ctx->parser)) <= 0) {
+		if (ret < 0)
+			sieve_address_error(ctx, "invalid characters after <");
+		return ret;
+	}
+
+	if (parse_addr_spec(ctx) < 0)
+		return -1;
+
+	if (*ctx->parser.data != '>') {
+		sieve_address_error(ctx, "missing '>'");
+		return -1;
+	}
+	ctx->parser.data++;
+
+	if ((ret = rfc822_skip_lwsp(&ctx->parser)) < 0) {
+		sieve_address_error(
+			ctx, "address ends with invalid characters");
+	}
+	return ret;
+}
+
+static bool
+parse_mailbox_address(struct sieve_message_address_parser *ctx,
+		      const unsigned char *address, unsigned int addr_size)
+{
+	/* Initialize parser */
+
+	rfc822_parser_init(&ctx->parser, address, addr_size, NULL);
+
+	/* Parse */
+
+	rfc822_skip_lwsp(&ctx->parser);
+
+	if (ctx->parser.data == ctx->parser.end) {
+		sieve_address_error(ctx, "empty address");
+		return FALSE;
+	}
+
+	if (parse_mailbox(ctx) < 0)
+		return FALSE;
+
+	if (ctx->parser.data != ctx->parser.end) {
+		if (*ctx->parser.data == ',') {
+			sieve_address_error(
+				ctx, "not a single addres (found ',')");
+		} else {
+			sieve_address_error(
+				ctx, "address ends in invalid characters");
+		}
+		return FALSE;
+	}
+
+	if (str_len(ctx->domain) == 0) {
+		/* Not gonna happen */
+		sieve_address_error(ctx, "missing domain");
+		return FALSE;
+	}
+
+	if (str_len(ctx->local_part) == 0) {
+		sieve_address_error(ctx, "missing local part");
+		return FALSE;
+	}
+	return TRUE;
+}
+
+static bool
+sieve_address_do_validate(const unsigned char *address, size_t size,
+			  const char **error_r)
+{
+	struct sieve_message_address_parser ctx;
+
+	*error_r = NULL;
+
+	if (address == NULL) {
+		*error_r = "null address";
+		return FALSE;
+	}
+
+	i_zero(&ctx);
+
+	ctx.local_part = t_str_new(128);
+	ctx.domain = t_str_new(128);
+	ctx.str = t_str_new(128);
+	ctx.error = t_str_new(128);
+
+	if (!parse_mailbox_address(&ctx, address, size)) {
+		*error_r = str_c(ctx.error);
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+static const struct smtp_address *
+sieve_address_do_parse(const unsigned char *address, size_t size,
+		       const char **error_r)
+{
+	struct sieve_message_address_parser ctx;
+
+	*error_r = NULL;
+
+	if (address == NULL)
+		return NULL;
+
+	i_zero(&ctx);
+
+	ctx.local_part = t_str_new(128);
+	ctx.domain = t_str_new(128);
+	ctx.str = t_str_new(128);
+	ctx.error = t_str_new(128);
+
+	if (!parse_mailbox_address(&ctx, address, size)) {
+		*error_r = str_c(ctx.error);
+		return NULL;
+	}
+
+	(void)str_lcase(str_c_modifiable(ctx.domain));
+
+	return smtp_address_create_temp(str_c(ctx.local_part),
+					str_c(ctx.domain));
+}
+
+/*
+ * Sieve address
+ */
+
+const struct smtp_address *
+sieve_address_parse(const char *address, const char **error_r)
+{
+	return sieve_address_do_parse((const unsigned char *)address,
+				      strlen(address), error_r);
+}
+
+const struct smtp_address *
+sieve_address_parse_str(string_t *address, const char **error_r)
+{
+	return sieve_address_do_parse(str_data(address), str_len(address),
+				      error_r);
+}
+
+bool sieve_address_validate(const char *address, const char **error_r)
+{
+	return sieve_address_do_validate((const unsigned char *)address,
+					 strlen(address), error_r);
+}
+
+bool sieve_address_validate_str(string_t *address, const char **error_r)
+{
+	return sieve_address_do_validate(str_data(address), str_len(address),
+					 error_r);
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-address.h b/pigeonhole/src/lib-sieve/sieve-address.h
new file mode 100644
index 0000000..3779a07
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-address.h
@@ -0,0 +1,67 @@
+#ifndef SIEVE_ADDRESS_H
+#define SIEVE_ADDRESS_H
+
+#include "lib.h"
+#include "strfuncs.h"
+#include "smtp-address.h"
+
+#include "sieve-common.h"
+#include "sieve-stringlist.h"
+
+/*
+ * Address list API
+ */
+
+struct sieve_address_list {
+	struct sieve_stringlist strlist;
+
+	int (*next_item)(struct sieve_address_list *_addrlist,
+			 struct smtp_address *addr_r, string_t **unparsed_r);
+};
+
+static inline int
+sieve_address_list_next_item(struct sieve_address_list *addrlist,
+			     struct smtp_address *addr_r, string_t **unparsed_r)
+{
+	return addrlist->next_item(addrlist, addr_r, unparsed_r);
+}
+
+static inline void
+sieve_address_list_reset(struct sieve_address_list *addrlist)
+{
+	sieve_stringlist_reset(&addrlist->strlist);
+}
+
+static inline int
+sieve_address_list_get_length(struct sieve_address_list *addrlist)
+{
+	return sieve_stringlist_get_length(&addrlist->strlist);
+}
+
+static inline void
+sieve_address_list_set_trace(struct sieve_address_list *addrlist, bool trace)
+{
+	sieve_stringlist_set_trace(&addrlist->strlist, trace);
+}
+
+/*
+ * Header address list
+ */
+
+struct sieve_address_list *
+sieve_header_address_list_create(const struct sieve_runtime_env *renv,
+				 struct sieve_stringlist *field_values);
+
+/*
+ * Sieve address parsing/validatin
+ */
+
+const struct smtp_address *
+sieve_address_parse(const char *address, const char **error_r);
+const struct smtp_address *
+sieve_address_parse_str(string_t *address, const char **error_r);
+
+bool sieve_address_validate(const char *address, const char **error_r);
+bool sieve_address_validate_str(string_t *address, const char **error_r);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-ast.c b/pigeonhole/src/lib-sieve/sieve-ast.c
new file mode 100644
index 0000000..197dbad
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-ast.c
@@ -0,0 +1,1111 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "mempool.h"
+#include "array.h"
+
+#include "sieve-common.h"
+#include "sieve-script.h"
+#include "sieve-extensions.h"
+
+#include "sieve-ast.h"
+
+#include <stdio.h>
+
+/*
+ * Forward declarations
+ */
+
+static struct sieve_ast_node *
+sieve_ast_node_create(struct sieve_ast *ast, struct sieve_ast_node *parent,
+		      enum sieve_ast_type type, unsigned int source_line);
+
+/*
+ * Types
+ */
+
+/* Extensions to the AST */
+
+struct sieve_ast_extension_reg {
+	const struct sieve_extension *ext;
+	const struct sieve_ast_extension *ast_ext;
+	void *context;
+
+	bool required:1;
+};
+
+/*
+ * AST object
+ */
+
+struct sieve_ast {
+	pool_t pool;
+	int refcount;
+
+	struct sieve_instance *svinst;
+
+	struct sieve_script *script;
+
+	struct sieve_ast_node *root;
+
+	ARRAY(const struct sieve_extension *) linked_extensions;
+	ARRAY(struct sieve_ast_extension_reg) extensions;
+};
+
+struct sieve_ast *sieve_ast_create(struct sieve_script *script)
+{
+	pool_t pool;
+	struct sieve_ast *ast;
+	unsigned int ext_count;
+
+	pool = pool_alloconly_create("sieve_ast", 32768);
+	ast = p_new(pool, struct sieve_ast, 1);
+	ast->pool = pool;
+	ast->refcount = 1;
+
+	ast->script = script;
+	sieve_script_ref(script);
+	ast->svinst = sieve_script_svinst(script);
+
+	ast->root = sieve_ast_node_create(ast, NULL, SAT_ROOT, 0);
+	ast->root->identifier = "ROOT";
+
+	ext_count = sieve_extensions_get_count(ast->svinst);
+	p_array_init(&ast->linked_extensions, pool, ext_count);
+	p_array_init(&ast->extensions, pool, ext_count);
+
+	return ast;
+}
+
+void sieve_ast_ref(struct sieve_ast *ast)
+{
+	ast->refcount++;
+}
+
+void sieve_ast_unref(struct sieve_ast **ast)
+{
+	unsigned int i, ext_count;
+	const struct sieve_ast_extension_reg *extrs;
+
+	i_assert((*ast)->refcount > 0);
+
+	if (--(*ast)->refcount != 0)
+		return;
+
+	/* Release script reference */
+	sieve_script_unref(&(*ast)->script);
+
+	/* Signal registered extensions that the AST is being destroyed */
+	extrs = array_get(&(*ast)->extensions, &ext_count);
+	for (i = 0; i < ext_count; i++) {
+		if (extrs[i].ast_ext != NULL &&	extrs[i].ast_ext->free != NULL)
+			extrs[i].ast_ext->free(extrs[i].ext, *ast,
+					       extrs[i].context);
+	}
+
+	/* Destroy AST */
+	pool_unref(&(*ast)->pool);
+
+	*ast = NULL;
+}
+
+struct sieve_ast_node *sieve_ast_root(struct sieve_ast *ast)
+{
+	return ast->root;
+}
+
+pool_t sieve_ast_pool(struct sieve_ast *ast)
+{
+	return ast->pool;
+}
+
+struct sieve_script *sieve_ast_script(struct sieve_ast *ast)
+{
+	return ast->script;
+}
+
+/*
+ * Extension support
+ */
+
+void sieve_ast_extension_link(struct sieve_ast *ast,
+			      const struct sieve_extension *ext, bool required)
+{
+	unsigned int i, ext_count;
+	const struct sieve_extension *const *extensions;
+	struct sieve_ast_extension_reg *reg;
+
+	if (ext->id < 0)
+		return;
+
+	/* Initialize registration */
+	reg = array_idx_get_space(&ast->extensions, (unsigned int)ext->id);
+	i_assert(reg->ext == NULL || reg->ext == ext);
+	reg->ext = ext;
+	reg->required = reg->required || required;
+
+	/* Prevent duplicates */
+	extensions = array_get(&ast->linked_extensions, &ext_count);
+	for (i = 0; i < ext_count; i++) {
+		if (extensions[i] == ext)
+			return;
+	}
+
+	/* Add extension */
+	array_append(&ast->linked_extensions, &ext, 1);
+}
+
+const struct sieve_extension * const *
+sieve_ast_extensions_get(struct sieve_ast *ast, unsigned int *count_r)
+{
+	return array_get(&ast->linked_extensions, count_r);
+}
+
+void sieve_ast_extension_register(struct sieve_ast *ast,
+				  const struct sieve_extension *ext,
+				  const struct sieve_ast_extension *ast_ext,
+				  void *context)
+{
+	struct sieve_ast_extension_reg *reg;
+
+	if (ext->id < 0)
+		return;
+
+	/* Initialize registration */
+	reg = array_idx_get_space(&ast->extensions, (unsigned int)ext->id);
+	i_assert(reg->ext == NULL || reg->ext == ext);
+	reg->ext = ext;
+	reg->ast_ext = ast_ext;
+	reg->context = context;
+}
+
+void sieve_ast_extension_set_context(struct sieve_ast *ast,
+				     const struct sieve_extension *ext,
+				     void *context)
+{
+	struct sieve_ast_extension_reg *reg;
+
+	if (ext->id < 0)
+		return;
+
+	reg = array_idx_get_space(&ast->extensions, (unsigned int)ext->id);
+	reg->context = context;
+}
+
+void *sieve_ast_extension_get_context(struct sieve_ast *ast,
+				      const struct sieve_extension *ext)
+{
+	const struct sieve_ast_extension_reg *reg;
+
+	if  (ext->id < 0 || ext->id >= (int)array_count(&ast->extensions))
+		return NULL;
+
+	reg = array_idx(&ast->extensions, (unsigned int)ext->id);
+
+	return reg->context;
+}
+
+bool sieve_ast_extension_is_required
+(struct sieve_ast *ast, const struct sieve_extension *ext)
+{
+	const struct sieve_ast_extension_reg *reg;
+
+	i_assert(ext->id >= 0 &&
+		 ext->id < (int)array_count(&ast->extensions));
+
+	reg = array_idx(&ast->extensions, (unsigned int)ext->id);
+	return reg->required;
+}
+
+/*
+ * AST list implementations
+ */
+
+/* Very simplistic linked list implementation
+   FIXME: Merge with core
+ */
+#define __LIST_CREATE(pool, type) { \
+		type *list = p_new(pool, type, 1); \
+		list->head = NULL; \
+		list->tail = NULL; \
+		list->len = 0; \
+		return list; \
+	}
+
+#define __LIST_ADD(list, node) { \
+		if (list->len + 1 < list->len) \
+			return FALSE; \
+		\
+		node->next = NULL; \
+		if (list->head == NULL) { \
+			node->prev = NULL; \
+			list->head = node; \
+			list->tail = node; \
+		} else { \
+			list->tail->next = node; \
+			node->prev = list->tail; \
+			list->tail = node; \
+		} \
+		list->len++; \
+		node->list = list; \
+		return TRUE; \
+	}
+
+#define __LIST_INSERT(list, before, node) { \
+		if (list->len + 1 < list->len) \
+			return FALSE; \
+		\
+		node->next = before; \
+		if (list->head == before) { \
+			node->prev = NULL; \
+			list->head = node; \
+		} else { \
+			before->prev->next = node; \
+		} \
+		node->prev = before->prev; \
+		before->prev = node; \
+		list->len++; \
+		node->list = list; \
+		\
+		return TRUE; \
+	}
+
+#define __LIST_JOIN(list, node_type, items) { \
+		node_type *node; \
+		\
+		if (list->len + items->len < list->len) \
+			return FALSE; \
+		\
+		if (items->len == 0) \
+			return TRUE; \
+		\
+		if (list->head == NULL) { \
+			list->head = items->head; \
+			list->tail = items->tail; \
+		} else { \
+			list->tail->next = items->head; \
+			items->head->prev = list->tail; \
+			list->tail = items->tail; \
+		} \
+		list->len += items->len; \
+		\
+		node = items->head; \
+		while (node != NULL) { \
+			node->list = list; \
+			node = node->next; \
+		} \
+		return TRUE; \
+	}
+
+#define __LIST_DETACH(first, node_type, count) { \
+		node_type *last, *result; \
+		unsigned int left; \
+		\
+		i_assert(first->list != NULL); \
+		\
+		left = count - 1; \
+		last = first; \
+		while (left > 0 && last->next != NULL) { \
+			left--; \
+			last = last->next; \
+		} \
+		\
+		if (first->list->head == first) \
+			first->list->head = last->next; \
+		if (first->list->tail == last) \
+			first->list->tail = first->prev; \
+		\
+		if (first->prev != NULL) \
+			first->prev->next = last->next;	\
+		if (last->next != NULL) \
+			last->next->prev = first->prev; \
+		\
+		first->list->len -= count - left; \
+		\
+		result = last->next; \
+		first->prev = NULL; \
+		last->next = NULL; \
+		\
+		return result; \
+	}
+
+/* List of AST nodes */
+
+static struct sieve_ast_list *
+sieve_ast_list_create(pool_t pool)
+	__LIST_CREATE(pool, struct sieve_ast_list)
+
+static bool
+sieve_ast_list_add(struct sieve_ast_list *list, struct sieve_ast_node *node)
+	__LIST_ADD(list, node)
+
+static struct sieve_ast_node *
+sieve_ast_list_detach(struct sieve_ast_node *first, unsigned int count)
+	__LIST_DETACH(first, struct sieve_ast_node, count)
+
+/* List of argument AST nodes */
+
+struct sieve_ast_arg_list *sieve_ast_arg_list_create(pool_t pool)
+	__LIST_CREATE(pool, struct sieve_ast_arg_list)
+
+bool sieve_ast_arg_list_add(struct sieve_ast_arg_list *list,
+			    struct sieve_ast_argument *argument)
+	__LIST_ADD(list, argument)
+
+bool sieve_ast_arg_list_insert(struct sieve_ast_arg_list *list,
+			       struct sieve_ast_argument *before,
+			       struct sieve_ast_argument *argument)
+	__LIST_INSERT(list, before, argument)
+
+static bool
+sieve_ast_arg_list_join(struct sieve_ast_arg_list *list,
+			struct sieve_ast_arg_list *items)
+	__LIST_JOIN(list, struct sieve_ast_argument, items)
+
+static struct sieve_ast_argument *
+sieve_ast_arg_list_detach(struct sieve_ast_argument *first,
+			  const unsigned int count)
+	__LIST_DETACH(first, struct sieve_ast_argument, count)
+
+void sieve_ast_arg_list_substitute(struct sieve_ast_arg_list *list,
+				   struct sieve_ast_argument *argument,
+				   struct sieve_ast_argument *replacement)
+{
+	if (list->head == argument)
+		list->head = replacement;
+	if (list->tail == argument)
+		list->tail = replacement;
+
+	if (argument->prev != NULL)
+		argument->prev->next = replacement;
+	if (argument->next != NULL)
+		argument->next->prev = replacement;
+
+	replacement->prev = argument->prev;
+	replacement->next = argument->next;
+	replacement->list = argument->list;
+
+	argument->next = NULL;
+	argument->prev = NULL;
+}
+
+/*
+ * AST node
+ */
+
+static struct sieve_ast_node *
+sieve_ast_node_create(struct sieve_ast *ast, struct sieve_ast_node *parent,
+		      enum sieve_ast_type type, unsigned int source_line)
+{
+	struct sieve_ast_node *node =
+		p_new(ast->pool, struct sieve_ast_node, 1);
+
+	node->ast = ast;
+	node->parent = parent;
+	node->type = type;
+
+	node->prev = NULL;
+	node->next = NULL;
+
+	node->arguments = NULL;
+	node->tests = NULL;
+	node->commands = NULL;
+
+	node->test_list = FALSE;
+	node->block = FALSE;
+
+	node->source_line = source_line;
+
+	return node;
+}
+
+static bool
+sieve_ast_node_add_command(struct sieve_ast_node *node,
+			   struct sieve_ast_node *command)
+{
+	i_assert(command->type == SAT_COMMAND &&
+		 (node->type == SAT_ROOT || node->type == SAT_COMMAND));
+
+	if (node->commands == NULL)
+		node->commands = sieve_ast_list_create(node->ast->pool);
+
+	return sieve_ast_list_add(node->commands, command);
+}
+
+static bool
+sieve_ast_node_add_test(struct sieve_ast_node *node,
+			struct sieve_ast_node *test)
+{
+	i_assert(test->type == SAT_TEST &&
+		 (node->type == SAT_TEST || node->type == SAT_COMMAND));
+
+	if (node->tests == NULL)
+		node->tests = sieve_ast_list_create(node->ast->pool);
+
+	return sieve_ast_list_add(node->tests, test);
+}
+
+static bool
+sieve_ast_node_add_argument(struct sieve_ast_node *node,
+			    struct sieve_ast_argument *argument)
+{
+	i_assert(node->type == SAT_TEST || node->type == SAT_COMMAND);
+
+	if (node->arguments == NULL)
+		node->arguments = sieve_ast_arg_list_create(node->ast->pool);
+
+	return sieve_ast_arg_list_add(node->arguments, argument);
+}
+
+struct sieve_ast_node *sieve_ast_node_detach(struct sieve_ast_node *first)
+{
+	return sieve_ast_list_detach(first, 1);
+}
+
+const char *sieve_ast_type_name(enum sieve_ast_type ast_type)
+{
+	switch (ast_type) {
+	case SAT_NONE:
+		return "none";
+	case SAT_ROOT:
+		return "ast root node";
+	case SAT_COMMAND:
+		return "command";
+	case SAT_TEST:
+		return "test";
+	default:
+		return "??AST NODE??";
+	}
+}
+
+/*
+ * Argument AST node
+ */
+
+struct sieve_ast_argument *
+sieve_ast_argument_create(struct sieve_ast *ast, unsigned int source_line)
+{
+	struct sieve_ast_argument *arg =
+		p_new(ast->pool, struct sieve_ast_argument, 1);
+
+	arg->ast = ast;
+
+	arg->prev = NULL;
+	arg->next = NULL;
+
+	arg->source_line = source_line;
+
+	arg->argument = NULL;
+
+	return arg;
+}
+
+static void
+sieve_ast_argument_substitute(struct sieve_ast_argument *argument,
+			      struct sieve_ast_argument *replacement)
+{
+	sieve_ast_arg_list_substitute(argument->list, argument, replacement);
+}
+
+struct sieve_ast_argument *
+sieve_ast_argument_string_create_raw(struct sieve_ast *ast, string_t *str,
+				     unsigned int source_line)
+{
+	struct sieve_ast_argument *argument =
+		sieve_ast_argument_create(ast, source_line);
+
+	argument->type = SAAT_STRING;
+	argument->_value.str = str;
+
+	return argument;
+}
+
+struct sieve_ast_argument *
+sieve_ast_argument_string_create(struct sieve_ast_node *node,
+				 const string_t *str, unsigned int source_line)
+{
+	struct sieve_ast_argument *argument;
+	string_t *newstr;
+
+	/* Allocate new internal string buffer */
+	newstr = str_new(node->ast->pool, str_len(str));
+
+	/* Clone string */
+	str_append_str(newstr, str);
+
+	/* Create string argument */
+	argument = sieve_ast_argument_string_create_raw(
+		node->ast, newstr, source_line);
+
+	/* Add argument to command/test node */
+	sieve_ast_node_add_argument(node, argument);
+
+	return argument;
+}
+
+struct sieve_ast_argument *
+sieve_ast_argument_cstring_create(struct sieve_ast_node *node, const char *str,
+				  unsigned int source_line)
+{
+	struct sieve_ast_argument *argument;
+	string_t *newstr;
+
+	/* Allocate new internal string buffer */
+	newstr = str_new(node->ast->pool, strlen(str));
+
+	/* Clone string */
+	str_append(newstr, str);
+
+	/* Create string argument */
+	argument = sieve_ast_argument_string_create_raw(
+		node->ast, newstr, source_line);
+
+	/* Add argument to command/test node */
+	sieve_ast_node_add_argument(node, argument);
+
+	return argument;
+}
+
+void sieve_ast_argument_string_set(struct sieve_ast_argument *argument,
+				   string_t *newstr)
+{
+	i_assert(argument->type == SAAT_STRING);
+	argument->_value.str = newstr;
+}
+
+void sieve_ast_argument_string_setc(struct sieve_ast_argument *argument,
+				    const char *newstr)
+{
+	i_assert(argument->type == SAAT_STRING);
+
+	str_truncate(argument->_value.str, 0);
+	str_append(argument->_value.str, newstr);
+}
+
+void sieve_ast_argument_number_substitute(struct sieve_ast_argument *argument,
+					  sieve_number_t number)
+{
+	argument->type = SAAT_NUMBER;
+	argument->_value.number = number;
+}
+
+struct sieve_ast_argument *
+sieve_ast_argument_stringlist_create(struct sieve_ast_node *node,
+				     unsigned int source_line)
+{
+	struct sieve_ast_argument *argument =
+		sieve_ast_argument_create(node->ast, source_line);
+
+	argument->type = SAAT_STRING_LIST;
+	argument->_value.strlist = NULL;
+
+	sieve_ast_node_add_argument(node, argument);
+
+	return argument;
+}
+
+struct sieve_ast_argument *
+sieve_ast_argument_stringlist_substitute(struct sieve_ast_node *node,
+					 struct sieve_ast_argument *arg)
+{
+	struct sieve_ast_argument *argument =
+		sieve_ast_argument_create(node->ast, arg->source_line);
+
+	argument->type = SAAT_STRING_LIST;
+	argument->_value.strlist = NULL;
+
+	sieve_ast_argument_substitute(arg, argument);
+
+	return argument;
+}
+
+static inline bool
+_sieve_ast_stringlist_add_item(struct sieve_ast_argument *list,
+			       struct sieve_ast_argument *item)
+{
+	i_assert(list->type == SAAT_STRING_LIST);
+
+	if (list->_value.strlist == NULL) {
+		list->_value.strlist =
+			sieve_ast_arg_list_create(list->ast->pool);
+	}
+
+	return sieve_ast_arg_list_add(list->_value.strlist, item);
+}
+
+static bool
+sieve_ast_stringlist_add_stringlist(struct sieve_ast_argument *list,
+				    struct sieve_ast_argument *items)
+{
+	i_assert(list->type == SAAT_STRING_LIST);
+	i_assert(items->type == SAAT_STRING_LIST);
+
+	if (list->_value.strlist == NULL) {
+		list->_value.strlist =
+			sieve_ast_arg_list_create(list->ast->pool);
+	}
+
+	return sieve_ast_arg_list_join(list->_value.strlist,
+				       items->_value.strlist);
+}
+
+static bool
+_sieve_ast_stringlist_add_str(struct sieve_ast_argument *list, string_t *str,
+			      unsigned int source_line)
+{
+	struct sieve_ast_argument *stritem;
+
+	stritem = sieve_ast_argument_create(list->ast, source_line);
+	stritem->type = SAAT_STRING;
+	stritem->_value.str = str;
+
+	return _sieve_ast_stringlist_add_item(list, stritem);
+}
+
+bool sieve_ast_stringlist_add(struct sieve_ast_argument *list,
+			      const string_t *str, unsigned int source_line)
+{
+	string_t *copied_str = str_new(list->ast->pool, str_len(str));
+	str_append_str(copied_str, str);
+
+	return _sieve_ast_stringlist_add_str(list, copied_str, source_line);
+}
+
+bool sieve_ast_stringlist_add_strc(struct sieve_ast_argument *list,
+				   const char *str, unsigned int source_line)
+{
+	string_t *copied_str = str_new(list->ast->pool, strlen(str));
+	str_append(copied_str, str);
+
+	return _sieve_ast_stringlist_add_str(list, copied_str, source_line);
+}
+
+struct sieve_ast_argument *
+sieve_ast_argument_tag_create(struct sieve_ast_node *node, const char *tag,
+			      unsigned int source_line)
+{
+	struct sieve_ast_argument *argument =
+		sieve_ast_argument_create(node->ast, source_line);
+
+	argument->type = SAAT_TAG;
+	argument->_value.tag = p_strdup(node->ast->pool, tag);
+
+	if (!sieve_ast_node_add_argument(node, argument))
+		return NULL;
+	return argument;
+}
+
+struct sieve_ast_argument *
+sieve_ast_argument_tag_insert(struct sieve_ast_argument *before,
+			      const char *tag, unsigned int source_line)
+{
+	struct sieve_ast_argument *argument =
+		sieve_ast_argument_create(before->ast, source_line);
+
+	argument->type = SAAT_TAG;
+	argument->_value.tag = p_strdup(before->ast->pool, tag);
+
+	if (!sieve_ast_arg_list_insert(before->list, before, argument))
+		return NULL;
+	return argument;
+}
+
+struct sieve_ast_argument *
+sieve_ast_argument_number_create(struct sieve_ast_node *node,
+				 sieve_number_t number,
+				 unsigned int source_line)
+{
+	struct sieve_ast_argument *argument =
+		sieve_ast_argument_create(node->ast, source_line);
+
+	argument->type = SAAT_NUMBER;
+	argument->_value.number = number;
+
+	if (!sieve_ast_node_add_argument(node, argument))
+		return NULL;
+	return argument;
+}
+
+void sieve_ast_argument_number_set(struct sieve_ast_argument *argument,
+				   sieve_number_t newnum)
+{
+	i_assert(argument->type == SAAT_NUMBER);
+	argument->_value.number = newnum;
+}
+
+struct sieve_ast_argument *
+sieve_ast_arguments_detach(struct sieve_ast_argument *first,
+			   unsigned int count)
+{
+	return sieve_ast_arg_list_detach(first, count);
+}
+
+bool sieve_ast_argument_attach(struct sieve_ast_node *node,
+			       struct sieve_ast_argument *argument)
+{
+	return sieve_ast_node_add_argument(node, argument);
+}
+
+const char *sieve_ast_argument_type_name(enum sieve_ast_argument_type arg_type)
+{
+	switch (arg_type) {
+	case SAAT_NONE:
+		return "none";
+	case SAAT_STRING_LIST:
+		return "a string list";
+	case SAAT_STRING:
+		return "a string";
+	case SAAT_NUMBER:
+		return "a number";
+	case SAAT_TAG:
+		return "a tag";
+	default:
+		return "??ARGUMENT??";
+	}
+}
+
+/* Test AST node */
+
+struct sieve_ast_node *
+sieve_ast_test_create(struct sieve_ast_node *parent, const char *identifier,
+		      unsigned int source_line)
+{
+	struct sieve_ast_node *test = sieve_ast_node_create(
+		parent->ast, parent, SAT_TEST, source_line);
+
+	test->identifier = p_strdup(parent->ast->pool, identifier);
+
+	if (!sieve_ast_node_add_test(parent, test))
+		return NULL;
+	return test;
+}
+
+/* Command AST node */
+
+struct sieve_ast_node *
+sieve_ast_command_create(struct sieve_ast_node *parent, const char *identifier,
+			 unsigned int source_line)
+{
+	struct sieve_ast_node *command = sieve_ast_node_create(
+		parent->ast, parent, SAT_COMMAND, source_line);
+
+	command->identifier = p_strdup(parent->ast->pool, identifier);
+
+	if (!sieve_ast_node_add_command(parent, command))
+		return NULL;
+	return command;
+}
+
+/*
+ * Utility
+ */
+
+int sieve_ast_stringlist_map(
+	struct sieve_ast_argument **listitem, void *context,
+	int (*map_function)(void *context, struct sieve_ast_argument *arg))
+{
+	if (sieve_ast_argument_type(*listitem) == SAAT_STRING) {
+		/* Single string */
+		return map_function(context, *listitem);
+	} else if (sieve_ast_argument_type(*listitem) == SAAT_STRING_LIST) {
+		int ret = 0;
+
+		/* String list */
+		*listitem = sieve_ast_strlist_first(*listitem);
+
+		while (*listitem != NULL) {
+			if ((ret = map_function(context, *listitem)) <= 0)
+				return ret;
+
+			*listitem = sieve_ast_strlist_next(*listitem);
+		}
+
+		return ret;
+	}
+
+	i_unreached();
+	return -1;
+}
+
+struct sieve_ast_argument *
+sieve_ast_stringlist_join(struct sieve_ast_argument *list,
+			  struct sieve_ast_argument *items)
+{
+	enum sieve_ast_argument_type list_type, items_type;
+	struct sieve_ast_argument *newlist;
+
+	list_type = sieve_ast_argument_type(list);
+	items_type = sieve_ast_argument_type(items);
+
+	switch (list_type) {
+	case SAAT_STRING:
+		switch (items_type) {
+		case SAAT_STRING:
+			newlist = sieve_ast_argument_create(
+				list->ast, list->source_line);
+			newlist->type = SAAT_STRING_LIST;
+			newlist->_value.strlist = NULL;
+
+			sieve_ast_argument_substitute(list, newlist);
+			sieve_ast_arguments_detach(items, 1);
+
+			if (!_sieve_ast_stringlist_add_item(newlist, list) ||
+			    !_sieve_ast_stringlist_add_item(newlist, items))
+				return NULL;
+			return newlist;
+		case SAAT_STRING_LIST:
+			/* Adding stringlist to string; make them swith places
+			   and add one to the other.
+			 */
+			sieve_ast_arguments_detach(items, 1);
+			sieve_ast_argument_substitute(list, items);
+			if (!_sieve_ast_stringlist_add_item(items, list))
+				return NULL;
+			return list;
+		default:
+			i_unreached();
+		}
+		break;
+	case SAAT_STRING_LIST:
+		switch (items_type) {
+		case SAAT_STRING:
+			/* Adding string to stringlist; straightforward add */
+			sieve_ast_arguments_detach(items, 1);
+			if (!_sieve_ast_stringlist_add_item(list, items))
+				return NULL;
+			return list;
+		case SAAT_STRING_LIST:
+			/* Adding stringlist to stringlist; perform actual join
+			 */
+			sieve_ast_arguments_detach(items, 1);
+			if (!sieve_ast_stringlist_add_stringlist(list, items))
+				return NULL;
+			return list;
+		default:
+			i_unreached();
+		}
+		break;
+	default:
+		i_unreached();
+	}
+	return NULL;
+}
+
+/* Debug */
+
+/* Unparsing, currently implemented using plain printf()s */
+
+static void sieve_ast_unparse_string(const string_t *strval)
+{
+	char *str = t_strdup_noconst(str_c((string_t *)strval));
+
+	if (strchr(str, '\n') != NULL && str[strlen(str)-1] == '\n') {
+		/* Print it as a multi-line string and do required dotstuffing
+		 */
+		char *spos = str;
+		char *epos = strchr(str, '\n');
+		printf("text:\n");
+
+		while (epos != NULL) {
+			*epos = '\0';
+			if (*spos == '.')
+				printf(".");
+
+			printf("%s\n", spos);
+
+			spos = epos+1;
+			epos = strchr(spos, '\n');
+		}
+		if (*spos == '.')
+			printf(".");
+
+		printf("%s\n.\n", spos);
+	} else {
+		/* Print it as a quoted string and escape " */
+		char *spos = str;
+		char *epos = strchr(str, '"');
+		printf("\"");
+
+		while (epos != NULL) {
+			*epos = '\0';
+			printf("%s\\\"", spos);
+
+			spos = epos+1;
+			epos = strchr(spos, '"');
+		}
+
+		printf("%s\"", spos);
+	}
+}
+
+static void
+sieve_ast_unparse_argument(struct sieve_ast_argument *argument, int level);
+
+static void
+sieve_ast_unparse_stringlist(struct sieve_ast_argument *strlist, int level)
+{
+	struct sieve_ast_argument *stritem;
+
+	if (sieve_ast_strlist_count(strlist) > 1) {
+		int i;
+
+		printf("[\n");
+
+		/* Create indent */
+		for (i = 0; i < level+2; i++)
+			printf("  ");
+
+		stritem = sieve_ast_strlist_first(strlist);
+		if (stritem != NULL) {
+			sieve_ast_unparse_string(
+				sieve_ast_strlist_str(stritem));
+
+			stritem = sieve_ast_strlist_next(stritem);
+			while (stritem != NULL) {
+				printf(",\n");
+				for (i = 0; i < level+2; i++)
+					printf("  ");
+				sieve_ast_unparse_string(
+					sieve_ast_strlist_str(stritem));
+				stritem = sieve_ast_strlist_next(stritem);
+			}
+		}
+
+		printf(" ]");
+	} else {
+		stritem = sieve_ast_strlist_first(strlist);
+		if (stritem != NULL) {
+			sieve_ast_unparse_string(
+				sieve_ast_strlist_str(stritem));
+		}
+	}
+}
+
+static void
+sieve_ast_unparse_argument(struct sieve_ast_argument *argument, int level)
+{
+	switch (argument->type) {
+	case SAAT_STRING:
+		sieve_ast_unparse_string(sieve_ast_argument_str(argument));
+		break;
+	case SAAT_STRING_LIST:
+		sieve_ast_unparse_stringlist(argument, level+1);
+		break;
+	case SAAT_NUMBER:
+		printf("%"SIEVE_PRI_NUMBER,
+		       sieve_ast_argument_number(argument));
+		break;
+	case SAAT_TAG:
+		printf(":%s", sieve_ast_argument_tag(argument));
+		break;
+	default:
+		printf("??ARGUMENT??");
+		break;
+	}
+}
+
+static void sieve_ast_unparse_test(struct sieve_ast_node *node, int level);
+
+static void sieve_ast_unparse_tests(struct sieve_ast_node *node, int level)
+{
+	struct sieve_ast_node *test;
+
+	if (sieve_ast_test_count(node) > 1) {
+		int i;
+
+		printf(" (\n");
+
+		/* Create indent */
+		for (i = 0; i < level+2; i++)
+			printf("  ");
+
+		test = sieve_ast_test_first(node);
+		sieve_ast_unparse_test(test, level+1);
+
+		test = sieve_ast_test_next(test);
+		while (test != NULL) {
+			printf(", \n");
+			for (i = 0; i < level+2; i++)
+				printf("  ");
+			sieve_ast_unparse_test(test, level+1);
+			test = sieve_ast_test_next(test);
+		}
+
+		printf(" )");
+	} else {
+		test = sieve_ast_test_first(node);
+		if (test != NULL)
+			sieve_ast_unparse_test(test, level);
+	}
+}
+
+static void sieve_ast_unparse_test(struct sieve_ast_node *node, int level)
+{
+	struct sieve_ast_argument *argument;
+
+	printf(" %s", node->identifier);
+
+	argument = sieve_ast_argument_first(node);
+	while (argument != NULL) {
+		printf(" ");
+		sieve_ast_unparse_argument(argument, level);
+		argument = sieve_ast_argument_next(argument);
+	}
+
+	sieve_ast_unparse_tests(node, level);
+}
+
+static void sieve_ast_unparse_command(struct sieve_ast_node *node, int level)
+{
+	struct sieve_ast_node *command;
+	struct sieve_ast_argument *argument;
+
+	int i;
+
+	/* Create indent */
+	for (i = 0; i < level; i++)
+		printf("  ");
+
+	printf("%s", node->identifier);
+
+	argument = sieve_ast_argument_first(node);
+	while (argument != NULL) {
+		printf(" ");
+		sieve_ast_unparse_argument(argument, level);
+		argument = sieve_ast_argument_next(argument);
+	}
+
+	sieve_ast_unparse_tests(node, level);
+
+	command = sieve_ast_command_first(node);
+	if (command != NULL) {
+		printf(" {\n");
+
+		while (command != NULL) {
+			sieve_ast_unparse_command(command, level+1);
+			command = sieve_ast_command_next(command);
+		}
+
+		for (i = 0; i < level; i++)
+			printf("  ");
+		printf("}\n");
+	} else
+		printf(";\n");
+}
+
+void sieve_ast_unparse(struct sieve_ast *ast)
+{
+	struct sieve_ast_node *command;
+
+	printf("Unparsing Abstract Syntax Tree:\n");
+
+	T_BEGIN {
+		command = sieve_ast_command_first(sieve_ast_root(ast));
+		while (command != NULL) {
+			sieve_ast_unparse_command(command, 0);
+			command = sieve_ast_command_next(command);
+		}
+	} T_END;
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-ast.h b/pigeonhole/src/lib-sieve/sieve-ast.h
new file mode 100644
index 0000000..00f8a6b
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-ast.h
@@ -0,0 +1,382 @@
+#ifndef SIEVE_AST_H
+#define SIEVE_AST_H
+
+#include "lib.h"
+#include "str.h"
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+
+/*
+	Abstract Syntax Tree (AST) structure:
+
+	sieve_ast (root)
+	[*command]
+	 |
+	 +-- command:
+	 |   ....
+	 +-- command:
+	 |	 [identifier *argument                      *test *command]
+	 |                +-- argument:                 |     \--> as from root
+	 |                |   ....                      |
+ 	 |                +-- argument:                 V (continued below)
+	 |                |   [number | tag | *string]
+	 |                .
+	 .
+
+	 *test
+	 +-- test:
+	 |   ....
+	 +-- test:
+	 |   [identifier *argument                     *test]
+	 |               +-- argument:                 \-->  as from the top
+	 .               |   ....                              of this tree
+	                 +-- argument:
+	                 |   [number | tag | *string]
+	                 .
+
+	 Tests and commands are defined using the same structure: sieve_ast_node.
+	 However, arguments and string-lists are described using sieve_ast_argument.
+*/
+
+/* IMPORTANT NOTICE: Do not decorate the AST with objects other than those
+   allocated on the ast's pool or static const objects. Otherwise it is possible
+   that pointers in the tree become dangling which is highly undesirable.
+ */
+
+/*
+ * Forward declarations
+ */
+
+struct sieve_ast_list;
+struct sieve_ast_arg_list;
+
+/*
+ * Types
+ */
+
+enum sieve_ast_argument_type {
+	SAAT_NONE,
+	SAAT_NUMBER,
+	SAAT_STRING,
+	SAAT_STRING_LIST,
+	SAAT_TAG,
+};
+
+enum sieve_ast_type {
+	SAT_NONE,
+	SAT_ROOT,
+	SAT_COMMAND,
+	SAT_TEST,
+};
+
+/*
+ * AST Nodes
+ */
+
+/* Argument node */
+
+struct sieve_ast_argument {
+	enum sieve_ast_argument_type type;
+
+	/* Back reference to the AST object */
+	struct sieve_ast *ast;
+
+	/* List related */
+	struct sieve_ast_arg_list *list;
+	struct sieve_ast_argument *next;
+	struct sieve_ast_argument *prev;
+
+	/* Parser-assigned data */
+
+	union {
+		string_t *str;
+		struct sieve_ast_arg_list *strlist;
+		const char *tag;
+		sieve_number_t number;
+	} _value;
+
+	unsigned int source_line;
+
+	/* Assigned during validation */
+
+	/* Argument associated with this ast element  */
+	struct sieve_argument *argument;
+
+	/* Parameters to this (tag) argument */
+	struct sieve_ast_argument *parameters;
+};
+
+struct sieve_ast_node {
+	enum sieve_ast_type type;
+
+	/* Back reference to the AST object */
+	struct sieve_ast *ast;
+
+	/* Back reference to this node's parent */
+	struct sieve_ast_node *parent;
+
+	/* Linked list references */
+	struct sieve_ast_list *list;
+	struct sieve_ast_node *next;
+	struct sieve_ast_node *prev;
+
+	/* Commands (NULL if not allocated) */
+	bool block;
+	struct sieve_ast_list *commands;
+
+	/* Tests (NULL if not allocated)*/
+	bool test_list;
+	struct sieve_ast_list *tests;
+
+	/* Arguments (NULL if not allocated) */
+	struct sieve_ast_arg_list *arguments;
+
+	/* Identifier of command or test */
+	const char *identifier;
+
+	/* The location in the file where this command was started */
+	unsigned int source_line;
+
+	/* Assigned during validation */
+
+	/* Context */
+	struct sieve_command *command;
+};
+
+/*
+ * AST node lists
+ */
+
+struct sieve_ast_list {
+	struct sieve_ast_node *head;
+	struct sieve_ast_node *tail;
+	unsigned int len;
+};
+
+struct sieve_ast_arg_list {
+	struct sieve_ast_argument *head;
+	struct sieve_ast_argument *tail;
+	unsigned int len;
+};
+
+/*
+ * AST object
+ */
+
+struct sieve_ast;
+
+struct sieve_ast *sieve_ast_create(struct sieve_script *script);
+void sieve_ast_ref(struct sieve_ast *ast);
+void sieve_ast_unref(struct sieve_ast **ast);
+
+struct sieve_ast_node *sieve_ast_root(struct sieve_ast *ast);
+pool_t sieve_ast_pool(struct sieve_ast *ast);
+struct sieve_script *sieve_ast_script(struct sieve_ast *ast);
+
+/* Extension support */
+
+struct sieve_ast_extension {
+	const struct sieve_extension_def *ext;
+
+	void (*free)(const struct sieve_extension *ext, struct sieve_ast *ast,
+		     void *context);
+};
+
+void sieve_ast_extension_link(struct sieve_ast *ast,
+			      const struct sieve_extension *ext,
+			      bool required);
+const struct sieve_extension * const *
+sieve_ast_extensions_get(struct sieve_ast *ast, unsigned int *count_r);
+
+void sieve_ast_extension_register(struct sieve_ast *ast,
+				  const struct sieve_extension *ext,
+				  const struct sieve_ast_extension *ast_ext,
+				  void *context);
+void sieve_ast_extension_set_context(struct sieve_ast *ast,
+				     const struct sieve_extension *ext,
+				     void *context);
+void *sieve_ast_extension_get_context(struct sieve_ast *ast,
+				      const struct sieve_extension *ext);
+
+bool sieve_ast_extension_is_required(struct sieve_ast *ast,
+				     const struct sieve_extension *ext);
+
+/*
+ * AST node manipulation
+ */
+
+/* Command nodes */
+
+struct sieve_ast_node *
+sieve_ast_test_create(struct sieve_ast_node *parent, const char *identifier,
+		      unsigned int source_line);
+struct sieve_ast_node *
+sieve_ast_command_create(struct sieve_ast_node *parent, const char *identifier,
+			 unsigned int source_line);
+
+struct sieve_ast_node *
+sieve_ast_node_detach(struct sieve_ast_node *first);
+
+const char *sieve_ast_type_name(enum sieve_ast_type ast_type);
+
+/* Argument nodes */
+
+struct sieve_ast_argument *
+sieve_ast_argument_create(struct sieve_ast *ast, unsigned int source_line);
+
+struct sieve_ast_arg_list *sieve_ast_arg_list_create(pool_t pool);
+bool sieve_ast_arg_list_add(struct sieve_ast_arg_list *list,
+			    struct sieve_ast_argument *argument);
+bool sieve_ast_arg_list_insert(struct sieve_ast_arg_list *list,
+			       struct sieve_ast_argument *before,
+			       struct sieve_ast_argument *argument);
+void sieve_ast_arg_list_substitute(struct sieve_ast_arg_list *list,
+				   struct sieve_ast_argument *argument,
+				   struct sieve_ast_argument *replacement);
+
+struct sieve_ast_argument *
+sieve_ast_argument_string_create_raw(struct sieve_ast *ast, string_t *str,
+				     unsigned int source_line);
+struct sieve_ast_argument *
+sieve_ast_argument_string_create(struct sieve_ast_node *node,
+				 const string_t *str, unsigned int source_line);
+struct sieve_ast_argument *
+sieve_ast_argument_cstring_create(struct sieve_ast_node *node, const char *str,
+				  unsigned int source_line);
+
+struct sieve_ast_argument *
+sieve_ast_argument_tag_create(struct sieve_ast_node *node, const char *tag,
+			      unsigned int source_line);
+
+struct sieve_ast_argument *
+sieve_ast_argument_number_create(struct sieve_ast_node *node,
+				 sieve_number_t number,
+				 unsigned int source_line);
+
+void sieve_ast_argument_string_set(struct sieve_ast_argument *argument,
+				   string_t *newstr);
+void sieve_ast_argument_string_setc(struct sieve_ast_argument *argument,
+				    const char *newstr);
+
+void sieve_ast_argument_number_set(struct sieve_ast_argument *argument,
+				   sieve_number_t newnum);
+void sieve_ast_argument_number_substitute(struct sieve_ast_argument *argument,
+					  sieve_number_t number);
+
+struct sieve_ast_argument *
+sieve_ast_argument_tag_insert(struct sieve_ast_argument *before,
+			      const char *tag, unsigned int source_line);
+
+struct sieve_ast_argument *
+sieve_ast_argument_stringlist_create(struct sieve_ast_node *node,
+				     unsigned int source_line);
+struct sieve_ast_argument *
+sieve_ast_argument_stringlist_substitute(struct sieve_ast_node *node,
+					 struct sieve_ast_argument *arg);
+
+struct sieve_ast_argument *
+sieve_ast_arguments_detach(struct sieve_ast_argument *first,
+			   unsigned int count);
+bool sieve_ast_argument_attach(struct sieve_ast_node *node,
+			       struct sieve_ast_argument *argument);
+
+const char *sieve_ast_argument_type_name(enum sieve_ast_argument_type arg_type);
+#define sieve_ast_argument_name(argument) \
+	sieve_ast_argument_type_name((argument)->type)
+
+bool sieve_ast_stringlist_add(struct sieve_ast_argument *list,
+			      const string_t *str, unsigned int source_line);
+bool sieve_ast_stringlist_add_strc(struct sieve_ast_argument *list,
+				   const char *str, unsigned int source_line);
+
+/*
+ * Utility
+ */
+
+int sieve_ast_stringlist_map(
+	struct sieve_ast_argument **listitem, void *context,
+	int (*map_function)(void *context, struct sieve_ast_argument *arg));
+struct sieve_ast_argument *
+sieve_ast_stringlist_join(struct sieve_ast_argument *list,
+			  struct sieve_ast_argument *items);
+
+/*
+ * AST access macros
+ */
+
+/* Generic list access macros */
+#define __AST_LIST_FIRST(list) \
+	((list) == NULL ? NULL : (list)->head)
+#define __AST_LIST_LAST(list) \
+	((list) == NULL ? NULL : (list)->tail)
+#define __AST_LIST_COUNT(list) \
+	((list) == NULL || (list)->head == NULL ? 0 : (list)->len)
+#define __AST_LIST_NEXT(item) ((item)->next)
+#define __AST_LIST_PREV(item) ((item)->prev)
+
+#define __AST_NODE_LIST_FIRST(node, list) __AST_LIST_FIRST((node)->list)
+#define __AST_NODE_LIST_LAST(node, list) __AST_LIST_LAST((node)->list)
+#define __AST_NODE_LIST_COUNT(node, list) __AST_LIST_COUNT((node)->list)
+
+/* AST macros */
+
+/* AST node macros */
+#define sieve_ast_node_pool(node) (sieve_ast_pool((node)->ast))
+#define sieve_ast_node_parent(node) ((node)->parent)
+#define sieve_ast_node_prev(node) __AST_LIST_PREV(node)
+#define sieve_ast_node_next(node) __AST_LIST_NEXT(node)
+#define sieve_ast_node_type(node) ((node) == NULL ? SAT_NONE : (node)->type)
+#define sieve_ast_node_line(node) ((node) == NULL ? 0 : (node)->source_line)
+
+/* AST command node macros */
+#define sieve_ast_command_first(node) __AST_NODE_LIST_FIRST(node, commands)
+#define sieve_ast_command_count(node) __AST_NODE_LIST_COUNT(node, commands)
+#define sieve_ast_command_prev(command) __AST_LIST_PREV(command)
+#define sieve_ast_command_next(command) __AST_LIST_NEXT(command)
+
+/* Compare the identifier of the previous command */
+#define sieve_ast_prev_cmd_is(cmd, id) \
+	((cmd)->prev == NULL ? FALSE : \
+	 strncasecmp((cmd)->prev->identifier, id, sizeof(id)-1) == 0)
+
+/* AST test macros */
+#define sieve_ast_test_count(node) __AST_NODE_LIST_COUNT(node, tests)
+#define sieve_ast_test_first(node) __AST_NODE_LIST_FIRST(node, tests)
+#define sieve_ast_test_next(test) __AST_LIST_NEXT(test)
+
+/* AST argument macros */
+#define sieve_ast_argument_pool(node) (sieve_ast_pool((node)->ast))
+#define sieve_ast_argument_first(node) __AST_NODE_LIST_FIRST(node, arguments)
+#define sieve_ast_argument_last(node) __AST_NODE_LIST_LAST(node, arguments)
+#define sieve_ast_argument_count(node) __AST_NODE_LIST_COUNT(node, arguments)
+#define sieve_ast_argument_prev(argument) __AST_LIST_PREV(argument)
+#define sieve_ast_argument_next(argument) __AST_LIST_NEXT(argument)
+#define sieve_ast_argument_type(argument) (argument)->type
+#define sieve_ast_argument_line(argument) (argument)->source_line
+
+#define sieve_ast_argument_str(argument) ((argument)->_value.str)
+#define sieve_ast_argument_strc(argument) (str_c((argument)->_value.str))
+#define sieve_ast_argument_tag(argument) ((argument)->_value.tag)
+#define sieve_ast_argument_number(argument) ((argument)->_value.number)
+
+/* AST string list macros */
+// @UNSAFE: should check whether we are actually accessing a string list
+#define sieve_ast_strlist_first(list) \
+	__AST_NODE_LIST_FIRST(list, _value.strlist)
+#define sieve_ast_strlist_last(list) \
+	__AST_NODE_LIST_LAST(list, _value.strlist)
+#define sieve_ast_strlist_count(list) \
+	__AST_NODE_LIST_COUNT(list, _value.strlist)
+#define sieve_ast_strlist_next(str) __AST_LIST_NEXT(str)
+#define sieve_ast_strlist_prev(str) __AST_LIST_PREV(str)
+#define sieve_ast_strlist_str(str) sieve_ast_argument_str(str)
+#define sieve_ast_strlist_strc(str) sieve_ast_argument_strc(str)
+
+/*
+ * Debug
+ */
+
+void sieve_ast_unparse(struct sieve_ast *ast);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-binary-code.c b/pigeonhole/src/lib-sieve/sieve-binary-code.c
new file mode 100644
index 0000000..0d76ee0
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-binary-code.c
@@ -0,0 +1,405 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "mempool.h"
+#include "buffer.h"
+#include "hash.h"
+#include "array.h"
+#include "ostream.h"
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+#include "sieve-extensions.h"
+#include "sieve-code.h"
+#include "sieve-script.h"
+
+#include "sieve-binary-private.h"
+
+/*
+ * Forward declarations
+ */
+
+static inline sieve_size_t
+sieve_binary_emit_dynamic_data(struct sieve_binary_block *sblock,
+			       const void *data, size_t size);
+
+/*
+ * Emission functions
+ */
+
+/* Low-level emission functions */
+
+static inline void
+_sieve_binary_emit_data(struct sieve_binary_block *sblock,
+			const void *data, sieve_size_t size)
+{
+	buffer_append(sblock->data, data, size);
+}
+
+static inline void
+_sieve_binary_emit_byte(struct sieve_binary_block *sblock, uint8_t byte)
+{
+	_sieve_binary_emit_data(sblock, &byte, 1);
+}
+
+static inline void
+_sieve_binary_update_data(struct sieve_binary_block *sblock,
+			  sieve_size_t address, const void *data,
+			  sieve_size_t size)
+{
+	buffer_write(sblock->data, address, data, size);
+}
+
+sieve_size_t sieve_binary_emit_data(struct sieve_binary_block *sblock,
+				    const void *data, sieve_size_t size)
+{
+	sieve_size_t address = _sieve_binary_block_get_size(sblock);
+
+	_sieve_binary_emit_data(sblock, data, size);
+
+	return address;
+}
+
+sieve_size_t sieve_binary_emit_byte(struct sieve_binary_block *sblock,
+				    uint8_t byte)
+{
+	sieve_size_t address = _sieve_binary_block_get_size(sblock);
+
+	_sieve_binary_emit_data(sblock, &byte, 1);
+
+	return address;
+}
+
+void sieve_binary_update_data(struct sieve_binary_block *sblock,
+			      sieve_size_t address, const void *data,
+			      sieve_size_t size)
+{
+	_sieve_binary_update_data(sblock, address, data, size);
+}
+
+/* Offset emission functions */
+
+sieve_size_t sieve_binary_emit_offset(struct sieve_binary_block *sblock,
+				      sieve_offset_t offset)
+{
+	sieve_size_t address = _sieve_binary_block_get_size(sblock);
+	uint8_t encoded[sizeof(offset)];
+	int i;
+
+	for (i = sizeof(offset)-1; i >= 0; i--) {
+		encoded[i] = (uint8_t)offset;
+		offset >>= 8;
+	}
+
+	_sieve_binary_emit_data(sblock, encoded, sizeof(offset));
+
+	return address;
+}
+
+void sieve_binary_resolve_offset(struct sieve_binary_block *sblock,
+				 sieve_size_t address)
+{
+	sieve_size_t cur_address = _sieve_binary_block_get_size(sblock);
+	sieve_offset_t offset;
+	uint8_t encoded[sizeof(offset)];
+	int i;
+
+	i_assert(cur_address > address);
+	i_assert((cur_address - address) <= (sieve_offset_t)-1);
+	offset = cur_address - address;
+	for (i = sizeof(offset)-1; i >= 0; i--) {
+		encoded[i] = (uint8_t)offset;
+		offset >>= 8;
+	}
+
+	_sieve_binary_update_data(sblock, address, encoded, sizeof(offset));
+}
+
+/* Literal emission */
+
+sieve_size_t sieve_binary_emit_integer(struct sieve_binary_block *sblock,
+				       sieve_number_t integer)
+{
+	sieve_size_t address = _sieve_binary_block_get_size(sblock);
+	uint8_t buffer[sizeof(sieve_number_t) + 1];
+	int bufpos = sizeof(buffer) - 1;
+
+	/* Encode last byte [0xxxxxxx]; msb == 0 marks the last byte */
+	buffer[bufpos] = integer & 0x7F;
+	bufpos--;
+
+	/* Encode first bytes [1xxxxxxx] */
+	integer >>= 7;
+	while (integer > 0) {
+		buffer[bufpos] = (integer & 0x7F) | 0x80;
+		bufpos--;
+		integer >>= 7;
+	}
+
+	/* Emit encoded integer */
+	bufpos++;
+	_sieve_binary_emit_data(sblock, buffer + bufpos, sizeof(buffer) - bufpos);
+
+	return address;
+}
+
+static inline sieve_size_t
+sieve_binary_emit_dynamic_data(struct sieve_binary_block *sblock,
+			       const void *data, sieve_size_t size)
+{
+	sieve_size_t address =
+		sieve_binary_emit_integer(sblock, (sieve_number_t)size);
+
+	_sieve_binary_emit_data(sblock, data, size);
+
+	return address;
+}
+
+sieve_size_t sieve_binary_emit_cstring(struct sieve_binary_block *sblock,
+				       const char *str)
+{
+	sieve_size_t address =
+		sieve_binary_emit_dynamic_data(sblock, (void *)str,
+					       (sieve_size_t)strlen(str));
+
+	_sieve_binary_emit_byte(sblock, 0);
+	return address;
+}
+
+sieve_size_t sieve_binary_emit_string(struct sieve_binary_block *sblock,
+				      const string_t *str)
+{
+	sieve_size_t address =
+		sieve_binary_emit_dynamic_data(sblock, (void *)str_data(str),
+					       (sieve_size_t)str_len(str));
+
+	_sieve_binary_emit_byte(sblock, 0);
+	return address;
+}
+
+/*
+ * Extension emission
+ */
+
+sieve_size_t sieve_binary_emit_extension(struct sieve_binary_block *sblock,
+					 const struct sieve_extension *ext,
+					 unsigned int offset)
+{
+	sieve_size_t address = _sieve_binary_block_get_size(sblock);
+	struct sieve_binary_extension_reg *ereg = NULL;
+
+	(void)sieve_binary_extension_register(sblock->sbin, ext, &ereg);
+
+	i_assert(ereg != NULL);
+
+	_sieve_binary_emit_byte(sblock, offset + ereg->index);
+	return address;
+}
+
+void sieve_binary_emit_extension_object(
+	struct sieve_binary_block *sblock,
+	const struct sieve_extension_objects *objs, unsigned int code)
+{
+	if (objs->count > 1)
+		_sieve_binary_emit_byte(sblock, code);
+}
+
+/*
+ * Code retrieval
+ */
+
+#define ADDR_CODE_READ(block) \
+	size_t _code_size; \
+	const int8_t *_code = buffer_get_data((block)->data, &_code_size)
+
+#define ADDR_CODE_AT(address) \
+	((int8_t)(_code[*address]))
+#define ADDR_DATA_AT(address) \
+	((uint8_t)(_code[*address]))
+#define ADDR_POINTER(address) \
+	((const int8_t *)(&_code[*address]))
+
+#define ADDR_BYTES_LEFT(address) \
+	((*address) > _code_size ? 0 : ((_code_size) - (*address)))
+#define ADDR_JUMP(address, offset) \
+	(*address) += offset
+
+/* Literals */
+
+bool sieve_binary_read_byte(struct sieve_binary_block *sblock,
+			    sieve_size_t *address, unsigned int *byte_r)
+{
+	ADDR_CODE_READ(sblock);
+
+	if (ADDR_BYTES_LEFT(address) >= 1) {
+		if (byte_r != NULL)
+			*byte_r = ADDR_DATA_AT(address);
+		ADDR_JUMP(address, 1);
+
+		return TRUE;
+	}
+
+	if (byte_r != NULL)
+		*byte_r = 0;
+	return FALSE;
+}
+
+bool sieve_binary_read_code(struct sieve_binary_block *sblock,
+			    sieve_size_t *address, signed int *code_r)
+{
+	ADDR_CODE_READ(sblock);
+
+	if (ADDR_BYTES_LEFT(address) >= 1) {
+		if (code_r != NULL)
+			*code_r = ADDR_CODE_AT(address);
+		ADDR_JUMP(address, 1);
+
+		return TRUE;
+	}
+
+	if (code_r != NULL)
+		*code_r = 0;
+	return FALSE;
+}
+
+
+bool sieve_binary_read_offset(struct sieve_binary_block *sblock,
+			      sieve_size_t *address, sieve_offset_t *offset_r)
+{
+	sieve_offset_t offs = 0;
+	ADDR_CODE_READ(sblock);
+
+	if (ADDR_BYTES_LEFT(address) >= 4) {
+		int i;
+
+		for (i = 0; i < 4; i++) {
+			offs = (offs << 8) + ADDR_DATA_AT(address);
+			ADDR_JUMP(address, 1);
+		}
+
+		if (offset_r != NULL)
+			*offset_r = offs;
+
+		return TRUE;
+	}
+	return FALSE;
+}
+
+/* FIXME: might need negative numbers in the future */
+bool sieve_binary_read_integer(struct sieve_binary_block *sblock,
+			       sieve_size_t *address, sieve_number_t *int_r)
+{
+	int bits = sizeof(sieve_number_t) * 8;
+	sieve_number_t integer = 0;
+
+	ADDR_CODE_READ(sblock);
+
+	if (ADDR_BYTES_LEFT(address) == 0)
+		return FALSE;
+
+	/* Read first integer bytes [1xxxxxxx] */
+	while ((ADDR_DATA_AT(address) & 0x80) > 0) {
+		if (ADDR_BYTES_LEFT(address) > 0 && bits > 0) {
+			integer |= ADDR_DATA_AT(address) & 0x7F;
+			ADDR_JUMP(address, 1);
+
+			/* Each byte encodes 7 bits of the integer */
+			integer <<= 7;
+			bits -= 7;
+		} else {
+			/* This is an error */
+			return FALSE;
+		}
+	}
+
+	/* Read last byte [0xxxxxxx] */
+	integer |= ADDR_DATA_AT(address) & 0x7F;
+	ADDR_JUMP(address, 1);
+
+	if (int_r != NULL)
+		*int_r = integer;
+	return TRUE;
+}
+
+bool sieve_binary_read_string(struct sieve_binary_block *sblock,
+			      sieve_size_t *address, string_t **str_r)
+{
+	unsigned int strlen = 0;
+	const char *strdata;
+
+	ADDR_CODE_READ(sblock);
+
+	if (!sieve_binary_read_unsigned(sblock, address, &strlen))
+		return FALSE;
+
+	if (strlen > ADDR_BYTES_LEFT(address))
+		return FALSE;
+
+	strdata = (const char *)ADDR_POINTER(address);
+	ADDR_JUMP(address, strlen);
+
+	if (ADDR_CODE_AT(address) != 0)
+		return FALSE;
+
+ 	if (str_r != NULL)
+		*str_r = t_str_new_const(strdata, strlen);
+
+	ADDR_JUMP(address, 1);
+
+	return TRUE;
+}
+
+bool sieve_binary_read_extension(struct sieve_binary_block *sblock,
+				 sieve_size_t *address, unsigned int *offset_r,
+				 const struct sieve_extension **ext_r)
+{
+	unsigned int code;
+	unsigned int offset = *offset_r;
+	const struct sieve_extension *ext = NULL;
+
+	ADDR_CODE_READ(sblock);
+
+	if (ADDR_BYTES_LEFT(address) == 0)
+		return FALSE;
+
+	*offset_r = code = ADDR_DATA_AT(address);
+	ADDR_JUMP(address, 1);
+
+	if (code >= offset) {
+		ext = sieve_binary_extension_get_by_index(sblock->sbin,
+							  (code - offset));
+		if (ext == NULL)
+			return FALSE;
+	}
+
+	if (ext_r != NULL)
+		*ext_r = ext;
+	return TRUE;
+}
+
+const void *
+sieve_binary_read_extension_object(struct sieve_binary_block *sblock,
+				   sieve_size_t *address,
+				   const struct sieve_extension_objects *objs)
+{
+	unsigned int code;
+
+	ADDR_CODE_READ(sblock);
+
+	if (objs->count == 0)
+		return NULL;
+	if (objs->count == 1)
+		return objs->objects;
+	if (ADDR_BYTES_LEFT(address) == 0)
+		return NULL;
+
+	code = ADDR_DATA_AT(address);
+	ADDR_JUMP(address, 1);
+
+	if (code >= objs->count)
+		return NULL;
+	return ((const void *const *)objs->objects)[code];
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-binary-debug.c b/pigeonhole/src/lib-sieve/sieve-binary-debug.c
new file mode 100644
index 0000000..5e8b13a
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-binary-debug.c
@@ -0,0 +1,276 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+#include "sieve-code.h"
+
+#include "sieve-binary-private.h"
+
+/* Quick 'n dirty debug */
+#if 0
+#define debug_printf(...) printf ("lineinfo: " __VA_ARGS__)
+#else
+#define debug_printf(...)
+#endif
+
+/*
+ * Opcodes
+ */
+
+enum {
+	LINPROG_OP_COPY,
+	LINPROG_OP_ADVANCE_PC,
+	LINPROG_OP_ADVANCE_LINE,
+	LINPROG_OP_SET_COLUMN,
+	LINPROG_OP_SPECIAL_BASE
+};
+
+#define LINPROG_LINE_BASE   0
+#define LINPROG_LINE_RANGE  4
+
+/*
+ * Lineinfo writer
+ */
+
+struct sieve_binary_debug_writer {
+	struct sieve_binary_block *sblock;
+
+	sieve_size_t address;
+	unsigned int line;
+	unsigned int column;
+};
+
+struct sieve_binary_debug_writer *
+sieve_binary_debug_writer_init(struct sieve_binary_block *sblock)
+{
+	struct sieve_binary_debug_writer *dwriter;
+
+	dwriter = i_new(struct sieve_binary_debug_writer, 1);
+	dwriter->sblock = sblock;
+
+	return dwriter;
+}
+
+void sieve_binary_debug_writer_deinit(
+	struct sieve_binary_debug_writer **dwriter)
+{
+	i_free(*dwriter);
+	*dwriter = NULL;
+}
+
+void sieve_binary_debug_emit(struct sieve_binary_debug_writer *dwriter,
+			     sieve_size_t code_address, unsigned int code_line,
+			     unsigned int code_column)
+{
+	i_assert(code_address >= dwriter->address);
+
+	struct sieve_binary_block *sblock = dwriter->sblock;
+	sieve_size_t address_inc = code_address - dwriter->address;
+	int line_inc = (code_line > dwriter->line ?
+			(int)(code_line - dwriter->line) :
+			-(int)(dwriter->line - code_line));
+	unsigned int sp_opcode = 0;
+
+	/* Check for applicability of special opcode */
+	if (line_inc > 0 &&
+	    (LINPROG_LINE_BASE + LINPROG_LINE_RANGE - 1) >= line_inc) {
+		sp_opcode = LINPROG_OP_SPECIAL_BASE +
+			(line_inc - LINPROG_LINE_BASE) +
+			(LINPROG_LINE_RANGE * address_inc);
+
+		if (sp_opcode > 255)
+			sp_opcode = 0;
+	}
+
+	/* Update line and address */
+	if (sp_opcode == 0) {
+		if (line_inc != 0) {
+			(void)sieve_binary_emit_byte(sblock,
+						     LINPROG_OP_ADVANCE_LINE);
+			(void)sieve_binary_emit_unsigned(
+				sblock, (unsigned int)line_inc);
+		}
+
+		if (address_inc > 0) {
+			(void)sieve_binary_emit_byte(sblock,
+						     LINPROG_OP_ADVANCE_PC);
+			(void)sieve_binary_emit_unsigned(sblock, address_inc);
+		}
+	} else {
+		(void)sieve_binary_emit_byte(sblock, sp_opcode);
+	}
+
+	/* Set column */
+	if (dwriter->column != code_column) {
+		(void)sieve_binary_emit_byte(sblock, LINPROG_OP_SET_COLUMN);
+		(void)sieve_binary_emit_unsigned(sblock, code_column);
+	}
+
+	/* Generate matrix row */
+	(void)sieve_binary_emit_byte(sblock, LINPROG_OP_COPY);
+
+	dwriter->address = code_address;
+	dwriter->line = code_line;
+	dwriter->column = code_column;
+}
+
+/*
+ * Debug reader
+ */
+
+struct sieve_binary_debug_reader {
+	struct sieve_binary_block *sblock;
+
+	sieve_size_t address, last_address;
+	unsigned int line, last_line;
+
+	unsigned int column;
+
+	sieve_size_t state;
+};
+
+struct sieve_binary_debug_reader *
+sieve_binary_debug_reader_init(struct sieve_binary_block *sblock)
+{
+	struct sieve_binary_debug_reader *dreader;
+
+	dreader = i_new(struct sieve_binary_debug_reader, 1);
+	dreader->sblock = sblock;
+
+	return dreader;
+}
+
+void sieve_binary_debug_reader_deinit(
+	struct sieve_binary_debug_reader **dreader)
+{
+	i_free(*dreader);
+	*dreader = NULL;
+}
+
+void sieve_binary_debug_reader_reset(struct sieve_binary_debug_reader *dreader)
+{
+	dreader->address = 0;
+	dreader->line = 0;
+	dreader->column = 0;
+	dreader->state = 0;
+}
+
+unsigned int
+sieve_binary_debug_read_line(struct sieve_binary_debug_reader *dreader,
+			     sieve_size_t code_address)
+{
+	size_t linprog_size;
+	sieve_size_t address;
+	unsigned int line;
+
+	if (code_address < dreader->last_address)
+		sieve_binary_debug_reader_reset(dreader);
+
+	if (code_address >= dreader->last_address &&
+	    code_address < dreader->address) {
+		debug_printf("%08llx: NOOP [%08llx]\n",
+			     (unsigned long long)dreader->state,
+			     (unsigned long long)code_address);
+		return dreader->last_line;
+	}
+
+	address = dreader->address;
+	line = dreader->line;
+
+	debug_printf("%08llx: READ [%08llx]\n",
+		     (unsigned long long)dreader->state,
+		     (unsigned long long)code_address);
+
+	linprog_size = sieve_binary_block_get_size(dreader->sblock);
+	while (dreader->state < linprog_size) {
+		unsigned int opcode;
+		unsigned int value;
+		int line_inc;
+
+		if (sieve_binary_read_byte(dreader->sblock,
+					   &dreader->state, &opcode)) {
+			switch (opcode) {
+			case LINPROG_OP_COPY:
+				debug_printf("%08llx: COPY ==> %08llx: %ld\n",
+					     (unsigned long long)dreader->state,
+					     (unsigned long long)address, line);
+
+				dreader->last_address = dreader->address;
+				dreader->last_line = dreader->line;
+
+				dreader->address = address;
+				dreader->line = line;
+
+				if (code_address < address)
+					return dreader->last_line;
+				else if (code_address == address)
+					return dreader->line;
+				break;
+			case LINPROG_OP_ADVANCE_PC:
+				debug_printf("%08llx: ADV_PC\n",
+					     (unsigned long long)dreader->state);
+				if (!sieve_binary_read_unsigned(
+					dreader->sblock, &dreader->state,
+					&value)) {
+					sieve_binary_debug_reader_reset(dreader);
+					return 0;
+				}
+				debug_printf("        : + %d\n", value);
+				address += value;
+				break;
+			case LINPROG_OP_ADVANCE_LINE:
+				debug_printf("%08llx: ADV_LINE\n",
+					     (unsigned long long)dreader->state);
+				if (!sieve_binary_read_unsigned(
+					dreader->sblock, &dreader->state,
+					&value)) {
+					sieve_binary_debug_reader_reset(dreader);
+					return 0;
+				}
+				line_inc = (int)value;
+				debug_printf("        : + %d\n", line_inc);
+				line = (line_inc > 0 ?
+					line + (unsigned int)line_inc :
+					line - (unsigned int)-line_inc);
+				break;
+			case LINPROG_OP_SET_COLUMN:
+				debug_printf("%08llx: SET_COL\n",
+					     (unsigned long long)dreader->state);
+				if (!sieve_binary_read_unsigned(
+					dreader->sblock, &dreader->state,
+					&value)) {
+					sieve_binary_debug_reader_reset(dreader);
+					return 0;
+				}
+				debug_printf("        : = %d\n", value);
+				dreader->column = value;
+				break;
+			default:
+				opcode -= LINPROG_OP_SPECIAL_BASE;
+
+				address += (opcode / LINPROG_LINE_RANGE);
+				line += LINPROG_LINE_BASE +
+					(opcode % LINPROG_LINE_RANGE);
+
+				debug_printf("%08llx: SPECIAL\n",
+					     (unsigned long long)dreader->state);
+				debug_printf("        :  +A %d +L %d\n",
+					     (opcode / LINPROG_LINE_RANGE),
+					      LINPROG_LINE_BASE +
+						(opcode % LINPROG_LINE_RANGE));
+				break;
+			}
+		} else {
+			debug_printf("OPCODE READ FAILED\n");
+			sieve_binary_debug_reader_reset(dreader);
+			return 0;
+		}
+	}
+
+	return dreader->line;
+}
+
diff --git a/pigeonhole/src/lib-sieve/sieve-binary-dumper.c b/pigeonhole/src/lib-sieve/sieve-binary-dumper.c
new file mode 100644
index 0000000..3b3bb4b
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-binary-dumper.c
@@ -0,0 +1,326 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "ostream.h"
+#include "array.h"
+#include "buffer.h"
+#include "time-util.h"
+
+#include "sieve-common.h"
+#include "sieve-extensions.h"
+#include "sieve-dump.h"
+#include "sieve-script.h"
+
+#include "sieve-binary-private.h"
+
+/*
+ * Binary dumper object
+ */
+
+struct sieve_binary_dumper {
+	pool_t pool;
+
+	/* Dumptime environment */
+	struct sieve_dumptime_env dumpenv;
+};
+
+struct sieve_binary_dumper *
+sieve_binary_dumper_create(struct sieve_binary *sbin)
+{
+	pool_t pool;
+	struct sieve_binary_dumper *dumper;
+
+	pool = pool_alloconly_create("sieve_binary_dumper", 4096);
+	dumper = p_new(pool, struct sieve_binary_dumper, 1);
+	dumper->pool = pool;
+	dumper->dumpenv.dumper = dumper;
+
+	dumper->dumpenv.sbin = sbin;
+	sieve_binary_ref(sbin);
+
+	dumper->dumpenv.svinst = sieve_binary_svinst(sbin);
+
+	return dumper;
+}
+
+void sieve_binary_dumper_free(struct sieve_binary_dumper **dumper)
+{
+	sieve_binary_unref(&(*dumper)->dumpenv.sbin);
+	pool_unref(&((*dumper)->pool));
+
+	*dumper = NULL;
+}
+
+pool_t sieve_binary_dumper_pool(struct sieve_binary_dumper *dumper)
+{
+	return dumper->pool;
+}
+
+/*
+ * Formatted output
+ */
+
+void sieve_binary_dumpf(const struct sieve_dumptime_env *denv,
+			const char *fmt, ...)
+{
+	string_t *outbuf = t_str_new(128);
+	va_list args;
+
+	va_start(args, fmt);
+	str_vprintfa(outbuf, fmt, args);
+	va_end(args);
+
+	o_stream_nsend(denv->stream, str_data(outbuf), str_len(outbuf));
+}
+
+void sieve_binary_dump_sectionf(const struct sieve_dumptime_env *denv,
+				const char *fmt, ...)
+{
+	string_t *outbuf = t_str_new(128);
+	va_list args;
+
+	va_start(args, fmt);
+	str_printfa(outbuf, "\n* ");
+	str_vprintfa(outbuf, fmt, args);
+	str_printfa(outbuf, ":\n\n");
+	va_end(args);
+
+	o_stream_nsend(denv->stream, str_data(outbuf), str_len(outbuf));
+}
+
+/*
+ * Dumping the binary
+ */
+
+bool sieve_binary_dumper_run(struct sieve_binary_dumper *dumper,
+			     struct ostream *stream, bool verbose)
+{
+	struct sieve_binary *sbin = dumper->dumpenv.sbin;
+	struct sieve_script *script = sieve_binary_script(sbin);
+	struct sieve_dumptime_env *denv = &(dumper->dumpenv);
+	const struct sieve_binary_header *header = &sbin->header;
+	struct sieve_binary_block *sblock;
+	bool success = TRUE;
+	sieve_size_t offset;
+	int count, i;
+
+	dumper->dumpenv.stream = stream;
+
+	/* Dump header */
+
+	sieve_binary_dump_sectionf(denv, "Header");
+
+	sieve_binary_dumpf(denv,
+		"version = %"PRIu16".%"PRIu16"\n"
+		"flags = 0x%08"PRIx32"\n",
+		header->version_major, header->version_minor,
+		header->flags);
+	if (header->resource_usage.update_time != 0) {
+		time_t update_time =
+			(time_t)header->resource_usage.update_time;
+		sieve_binary_dumpf(denv,
+			"resource usage:\n"
+			"  update time = %s\n"
+			"  cpu time = %"PRIu32" ms\n",
+			t_strflocaltime("%Y-%m-%d %H:%M:%S",
+					update_time),
+			header->resource_usage.cpu_time_msecs);
+	}
+
+	/* Dump list of binary blocks */
+
+	if (verbose) {
+		count = sieve_binary_block_count(sbin);
+
+		sieve_binary_dump_sectionf(denv, "Binary blocks (count: %d)",
+					   count);
+
+		for (i = 0; i < count; i++) {
+			struct sieve_binary_block *sblock =
+				sieve_binary_block_get(sbin, i);
+
+			sieve_binary_dumpf(
+				denv, "%3d: size: %zu bytes\n",
+				i, sieve_binary_block_get_size(sblock));
+		}
+	}
+
+	/* Dump script metadata */
+
+	sieve_binary_dump_sectionf(denv, "Script metadata (block: %d)",
+				   SBIN_SYSBLOCK_SCRIPT_DATA);
+	sblock = sieve_binary_block_get(sbin, SBIN_SYSBLOCK_SCRIPT_DATA);
+
+	T_BEGIN {
+		offset = 0;
+		success = sieve_script_binary_dump_metadata(
+			script, denv, sblock, &offset);
+	} T_END;
+
+	if (!success)
+		return FALSE;
+
+	/* Dump list of used extensions */
+
+	count = sieve_binary_extensions_count(sbin);
+	if (count > 0) {
+		sieve_binary_dump_sectionf(
+			denv, "Required extensions (block: %d)",
+			SBIN_SYSBLOCK_EXTENSIONS);
+
+		for (i = 0; i < count; i++) {
+			const struct sieve_extension *ext =
+				sieve_binary_extension_get_by_index(sbin, i);
+
+			sblock = sieve_binary_extension_get_block(sbin, ext);
+
+			if (sblock == NULL) {
+				sieve_binary_dumpf(
+					denv, "%3d: %s (id: %d)\n",
+					i, sieve_extension_name(ext), ext->id);
+			} else {
+				sieve_binary_dumpf(
+					denv, "%3d: %s (id: %d; block: %d)\n",
+					i, sieve_extension_name(ext), ext->id,
+					sieve_binary_block_get_id(sblock));
+			}
+		}
+	}
+
+	/* Dump extension-specific elements of the binary */
+
+	count = sieve_binary_extensions_count(sbin);
+	if (count > 0) {
+		for (i = 0; i < count; i++) {
+			success = TRUE;
+
+			T_BEGIN {
+				const struct sieve_extension *ext =
+					sieve_binary_extension_get_by_index(
+						sbin, i);
+
+				if (ext->def != NULL &&
+				    ext->def->binary_dump != NULL) {
+					success = ext->def->binary_dump(
+						ext, denv);
+				}
+			} T_END;
+
+			if (!success)
+				return FALSE;
+		}
+	}
+
+	/* Dump main program */
+
+	sieve_binary_dump_sectionf(denv, "Main program (block: %d)",
+				   SBIN_SYSBLOCK_MAIN_PROGRAM);
+
+	dumper->dumpenv.sblock =
+		sieve_binary_block_get(sbin, SBIN_SYSBLOCK_MAIN_PROGRAM);
+	dumper->dumpenv.cdumper = sieve_code_dumper_create(&(dumper->dumpenv));
+
+	if (dumper->dumpenv.cdumper != NULL) {
+		sieve_code_dumper_run(dumper->dumpenv.cdumper);
+
+		sieve_code_dumper_free(&dumper->dumpenv.cdumper);
+	}
+
+	/* Finish with empty line */
+	sieve_binary_dumpf(denv, "\n");
+
+	return TRUE;
+}
+
+/*
+ * Hexdump production
+ */
+
+void sieve_binary_dumper_hexdump(struct sieve_binary_dumper *dumper,
+				 struct ostream *stream)
+{
+	struct sieve_binary *sbin = dumper->dumpenv.sbin;
+	struct sieve_dumptime_env *denv = &(dumper->dumpenv);
+	int count, i;
+
+	dumper->dumpenv.stream = stream;
+
+	count = sieve_binary_block_count(sbin);
+
+	/* Block overview */
+
+	sieve_binary_dump_sectionf(denv, "Binary blocks (count: %d)", count);
+
+	for (i = 0; i < count; i++) {
+		struct sieve_binary_block *sblock =
+			sieve_binary_block_get(sbin, i);
+
+		sieve_binary_dumpf(denv, "%3d: size: %zu bytes\n",
+				   i, sieve_binary_block_get_size(sblock));
+	}
+
+	/* Hexdump for each block */
+
+	for (i = 0; i < count; i++) {
+		struct sieve_binary_block *sblock =
+			sieve_binary_block_get(sbin, i);
+		buffer_t *blockbuf = sieve_binary_block_get_buffer(sblock);
+		string_t *line;
+		size_t data_size;
+		const unsigned char *data;
+		size_t offset;
+
+		data = buffer_get_data(blockbuf, &data_size);
+
+		// FIXME: calculate offset more nicely.
+		sieve_binary_dump_sectionf(
+			denv, "Block %d (%zu bytes, file offset %08llx)", i, data_size,
+			(unsigned long long int)sblock->offset + 8);
+
+		line = t_str_new(128);
+		offset = 0;
+		while (offset < data_size) {
+			size_t len = (data_size - offset >= 16 ?
+				      16 : data_size - offset);
+			size_t b;
+
+			str_printfa(line, "%08llx  ",
+				    (unsigned long long)offset);
+
+			for (b = 0; b < len; b++) {
+				str_printfa(line, "%02x ", data[offset+b]);
+				if (b == 7)
+					str_append_c(line, ' ');
+			}
+
+			if (len < 16) {
+				if (len <= 7)
+					str_append_c(line, ' ');
+
+				for (b = len; b < 16; b++)
+					str_append(line, "   ");
+			}
+
+			str_append(line, " |");
+
+			for (b = 0; b < len; b++) {
+				const unsigned char c = data[offset+b];
+
+				if (c >= 32 && c <= 126)
+					str_append_c(line, (const char)c);
+				else
+					str_append_c(line, '.');
+			}
+
+			str_append(line, "|\n");
+			o_stream_nsend(stream, str_data(line), str_len(line));
+			str_truncate(line, 0);
+			offset += len;
+		}
+
+		str_printfa(line, "%08llx\n", (unsigned long long)offset);
+		o_stream_nsend(stream, str_data(line), str_len(line));
+	}
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-binary-dumper.h b/pigeonhole/src/lib-sieve/sieve-binary-dumper.h
new file mode 100644
index 0000000..4343190
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-binary-dumper.h
@@ -0,0 +1,41 @@
+#ifndef SIEVE_BINARY_DUMPER_H
+#define SIEVE_BINARY_DUMPER_H
+
+#include "sieve-common.h"
+
+/*
+ * Binary dumper object
+ */
+
+struct sieve_binary_dumper;
+
+struct sieve_binary_dumper *
+sieve_binary_dumper_create(struct sieve_binary *sbin);
+void sieve_binary_dumper_free(struct sieve_binary_dumper **dumper);
+
+pool_t sieve_binary_dumper_pool(struct sieve_binary_dumper *dumper);
+
+/*
+ * Formatted output
+ */
+
+void sieve_binary_dumpf(const struct sieve_dumptime_env *denv,
+			const char *fmt, ...) ATTR_FORMAT(2, 3);
+void sieve_binary_dump_sectionf(const struct sieve_dumptime_env *denv,
+				const char *fmt, ...) ATTR_FORMAT(2, 3);
+
+/*
+ * Dumping the binary
+ */
+
+bool sieve_binary_dumper_run(struct sieve_binary_dumper *dumper,
+			     struct ostream *stream, bool verbose);
+
+/*
+ * Hexdump production
+ */
+
+void sieve_binary_dumper_hexdump(struct sieve_binary_dumper *dumper,
+				 struct ostream *stream);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-binary-file.c b/pigeonhole/src/lib-sieve/sieve-binary-file.c
new file mode 100644
index 0000000..8eedbc2
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-binary-file.c
@@ -0,0 +1,1042 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "mempool.h"
+#include "buffer.h"
+#include "hash.h"
+#include "array.h"
+#include "ostream.h"
+#include "eacces-error.h"
+#include "safe-mkstemp.h"
+#include "file-lock.h"
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+#include "sieve-extensions.h"
+#include "sieve-code.h"
+#include "sieve-script.h"
+
+#include "sieve-binary-private.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+/*
+ * Macros
+ */
+
+#define SIEVE_BINARY_MAGIC                      0xcafebabe
+#define SIEVE_BINARY_MAGIC_OTHER_ENDIAN         0xbebafeca
+
+#define SIEVE_BINARY_ALIGN(offset) \
+	(((offset) + 3) & ~3U)
+#define SIEVE_BINARY_ALIGN_PTR(ptr) \
+	((void *) SIEVE_BINARY_ALIGN(((size_t) ptr)))
+
+#define SIEVE_BINARY_PRE_HDR_SIZE_MAJOR         1
+#define SIEVE_BINARY_PRE_HDR_SIZE_MINOR         4
+#define SIEVE_BINARY_PRE_HDR_SIZE_HDR_SIZE      12
+
+/*
+ * Header and record structures of the binary on disk
+ */
+
+struct sieve_binary_block_index {
+	uint32_t id;
+	uint32_t size;
+	uint32_t offset;
+	uint32_t ext_id;
+};
+
+struct sieve_binary_block_header {
+	uint32_t id;
+	uint32_t size;
+};
+
+/*
+ * Header manipulation
+ */
+
+static int
+sieve_binary_file_read_header(struct sieve_binary *sbin, int fd,
+			      struct sieve_binary_header *header_r,
+			      enum sieve_error *error_r)
+{
+	struct sieve_binary_header header;
+	enum sieve_error error;
+	ssize_t rret;
+
+	if (error_r == NULL)
+		error_r = &error;
+	*error_r = SIEVE_ERROR_NONE;
+
+	rret = pread(fd, &header, sizeof(header), 0);
+	if (rret == 0) {
+		e_error(sbin->event, "read: "
+			"file is not large enough to contain the header");
+		*error_r = SIEVE_ERROR_NOT_VALID;
+		return -1;
+	} else if (rret < 0) {
+		e_error(sbin->event, "read: "
+			"failed to read from binary: %m");
+		*error_r = SIEVE_ERROR_TEMP_FAILURE;
+		return -1;
+	} else if (rret != sizeof(header)) {
+		e_error(sbin->event, "read: "
+			"header read only partially %zd/%zu",
+			rret, sizeof(header));
+		*error_r = SIEVE_ERROR_TEMP_FAILURE;
+		return -1;
+	}
+
+	/* Check header validity */
+	if (header.magic != SIEVE_BINARY_MAGIC) {
+		if (header.magic != SIEVE_BINARY_MAGIC_OTHER_ENDIAN) {
+			e_error(sbin->event, "read: "
+				"binary has corrupted header "
+				"(0x%08x) or it is not a Sieve binary",
+				header.magic);
+		} else {
+			e_error(sbin->event, "read: "
+				"binary stored with in different endian format "
+				"(automatically fixed when re-compiled)");
+		}
+		*error_r = SIEVE_ERROR_NOT_VALID;
+		return -1;
+	}
+	/* Check binary version */
+	if (header.version_major == SIEVE_BINARY_PRE_HDR_SIZE_MAJOR &&
+	    header.version_minor == SIEVE_BINARY_PRE_HDR_SIZE_MINOR) {
+		/* Old header without hdr_size; clear new fields */
+		static const size_t old_header_size =
+			SIEVE_BINARY_PRE_HDR_SIZE_HDR_SIZE;
+		memset(PTR_OFFSET(&header, old_header_size), 0,
+		       (sizeof(header) - old_header_size));
+		header.hdr_size = old_header_size;
+	} else if (header.version_major != SIEVE_BINARY_VERSION_MAJOR) {
+		/* Binary is of different major version. Caller will have to
+		   recompile */
+		e_error(sbin->event, "read: "
+			"binary stored with different major version %d.%d "
+			"(!= %d.%d; automatically fixed when re-compiled)",
+			(int)header.version_major, (int)header.version_minor,
+			SIEVE_BINARY_VERSION_MAJOR, SIEVE_BINARY_VERSION_MINOR);
+		*error_r = SIEVE_ERROR_NOT_VALID;
+		return -1;
+	} else if (header.hdr_size < SIEVE_BINARY_BASE_HEADER_SIZE) {
+		/* Header size is smaller than base size */
+		e_error(sbin->event, "read: "
+			"binary is corrupt: header size is too small");
+		*error_r = SIEVE_ERROR_NOT_VALID;
+		return -1;
+	}
+	/* Check block content */
+	if (header.blocks == 0) {
+		e_error(sbin->event, "read: "
+			"binary is corrupt: it contains no blocks");
+		*error_r = SIEVE_ERROR_NOT_VALID;
+		return -1;
+	}
+	/* Valid */
+	*header_r = header;
+	return 0;
+}
+
+static int
+sieve_binary_file_write_header(struct sieve_binary *sbin, int fd,
+			       struct sieve_binary_header *header,
+			       enum sieve_error *error_r) ATTR_NULL(4)
+{
+	ssize_t wret;
+
+	wret = pwrite(fd, header, sizeof(*header), 0);
+	if (wret < 0) {
+		e_error(sbin->event, "update: "
+			"failed to write to binary: %m");
+		if (error_r != NULL)
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+		return -1;
+	} else if (wret != sizeof(*header)) {
+		e_error(sbin->event, "update: "
+			"header written partially %zd/%zu",
+			wret, sizeof(*header));
+		if (error_r != NULL)
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+		return -1;
+	}
+	return 0;
+}
+
+static void sieve_binary_file_update_header(struct sieve_binary *sbin)
+{
+	struct sieve_binary_header *header = &sbin->header;
+	struct sieve_resource_usage rusage;
+
+	sieve_binary_get_resource_usage(sbin, &rusage);
+
+	i_zero(&header->resource_usage);
+	if (HAS_ALL_BITS(header->flags, SIEVE_BINARY_FLAG_RESOURCE_LIMIT) ||
+	    sieve_resource_usage_is_high(sbin->svinst, &rusage)) {
+		header->resource_usage.update_time = ioloop_time;
+		header->resource_usage.cpu_time_msecs = rusage.cpu_time_msecs;
+	}
+
+	sieve_resource_usage_init(&sbin->rusage);
+	sbin->rusage_updated = FALSE;
+
+	(void)sieve_binary_check_resource_usage(sbin);
+}
+
+/*
+ * Saving the binary to a file.
+ */
+
+static inline bool
+_save_skip(struct sieve_binary *sbin, struct ostream *stream, size_t size)
+{
+	if ((o_stream_seek(stream, stream->offset + size)) <= 0) {
+		e_error(sbin->event, "save: "
+			"failed to skip output stream to position "
+			"%"PRIuUOFF_T": %s", stream->offset + size,
+			strerror(stream->stream_errno));
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+static inline bool
+_save_skip_aligned(struct sieve_binary *sbin, struct ostream *stream,
+		   size_t size, uoff_t *offset)
+{
+	uoff_t aligned_offset = SIEVE_BINARY_ALIGN(stream->offset);
+
+	if ((o_stream_seek(stream, aligned_offset + size)) <= 0) {
+		e_error(sbin->event, "save: "
+			"failed to skip output stream to position "
+			"%"PRIuUOFF_T": %s", aligned_offset + size,
+			strerror(stream->stream_errno));
+		return FALSE;
+	}
+
+	if (offset != NULL)
+		*offset = aligned_offset;
+	return TRUE;
+}
+
+/* FIXME: Is this even necessary for a file? */
+static bool
+_save_full(struct sieve_binary *sbin, struct ostream *stream,
+	   const void *data, size_t size)
+{
+	size_t bytes_left = size;
+	const void *pdata = data;
+
+	while (bytes_left > 0) {
+		ssize_t ret;
+
+		ret = o_stream_send(stream, pdata, bytes_left);
+		if (ret <= 0) {
+			e_error(sbin->event, "save: "
+				"failed to write %zu bytes "
+				"to output stream: %s", bytes_left,
+				strerror(stream->stream_errno));
+			return FALSE;
+		}
+
+		pdata = PTR_OFFSET(pdata, ret);
+		bytes_left -= ret;
+	}
+
+	return TRUE;
+}
+
+static bool
+_save_aligned(struct sieve_binary *sbin, struct ostream *stream,
+	      const void *data, size_t size, uoff_t *offset)
+{
+	uoff_t aligned_offset = SIEVE_BINARY_ALIGN(stream->offset);
+
+	o_stream_cork(stream);
+
+	/* Align the data by adding zeroes to the output stream */
+	if (stream->offset < aligned_offset) {
+		if (!_save_skip(sbin, stream,
+				(aligned_offset - stream->offset)))
+			return FALSE;
+	}
+
+	if (!_save_full(sbin, stream, data, size))
+		return FALSE;
+
+	o_stream_uncork(stream);
+
+	if (offset != NULL)
+		*offset = aligned_offset;
+	return TRUE;
+}
+
+static bool
+_save_block(struct sieve_binary *sbin, struct ostream *stream, unsigned int id)
+{
+	struct sieve_binary_block_header block_header;
+	struct sieve_binary_block *block;
+	const void *data;
+	size_t size;
+
+	block = sieve_binary_block_get(sbin, id);
+	if (block == NULL)
+		return FALSE;
+
+	data = buffer_get_data(block->data, &size);
+
+	block_header.id = id;
+	block_header.size = size;
+
+	if (!_save_aligned(sbin, stream, &block_header, sizeof(block_header),
+			   &block->offset))
+		return FALSE;
+
+	return _save_aligned(sbin, stream, data, size, NULL);
+}
+
+static bool
+_save_block_index_record(struct sieve_binary *sbin, struct ostream *stream,
+			 unsigned int id)
+{
+	struct sieve_binary_block *block;
+	struct sieve_binary_block_index header;
+
+	block = sieve_binary_block_get(sbin, id);
+	if (block == NULL)
+		return FALSE;
+
+	header.id = id;
+	header.size = buffer_get_used_size(block->data);
+	header.ext_id = block->ext_index;
+	header.offset = block->offset;
+
+	if (!_save_full(sbin, stream, &header, sizeof(header))) {
+		e_error(sbin->event, "save: "
+			"failed to save block index header %d", id);
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+static bool
+sieve_binary_save_to_stream(struct sieve_binary *sbin, struct ostream *stream)
+{
+	struct sieve_binary_header *header = &sbin->header;
+	struct sieve_binary_block *ext_block;
+	unsigned int ext_count, blk_count, i;
+	uoff_t block_index;
+
+	blk_count = sieve_binary_block_count(sbin);
+
+	/* Create header */
+
+	header->magic = SIEVE_BINARY_MAGIC;
+	header->version_major = SIEVE_BINARY_VERSION_MAJOR;
+	header->version_minor = SIEVE_BINARY_VERSION_MINOR;
+	header->blocks = blk_count;
+	header->hdr_size = sizeof(*header);
+
+	header->flags &= ENUM_NEGATE(SIEVE_BINARY_FLAG_RESOURCE_LIMIT);
+	sieve_binary_file_update_header(sbin);
+
+	if (!_save_aligned(sbin, stream, header, sizeof(*header), NULL)) {
+		e_error(sbin->event, "save: failed to save header");
+		return FALSE;
+	}
+
+	/* Skip block index for now */
+
+	if (!_save_skip_aligned(
+		sbin, stream,
+		(sizeof(struct sieve_binary_block_index) * blk_count),
+		&block_index))
+		return FALSE;
+
+	/* Create block containing all used extensions */
+
+	ext_block = sieve_binary_block_get(sbin, SBIN_SYSBLOCK_EXTENSIONS);
+	i_assert(ext_block != NULL);
+	sieve_binary_block_clear(ext_block);
+
+	ext_count = array_count(&sbin->linked_extensions);
+	sieve_binary_emit_unsigned(ext_block, ext_count);
+
+	for (i = 0; i < ext_count; i++) {
+		struct sieve_binary_extension_reg * const *ext =
+			array_idx(&sbin->linked_extensions, i);
+
+		sieve_binary_emit_cstring(
+			ext_block, sieve_extension_name((*ext)->extension));
+		sieve_binary_emit_unsigned(
+			ext_block, sieve_extension_version((*ext)->extension));
+		sieve_binary_emit_unsigned(ext_block, (*ext)->block_id);
+	}
+
+	/* Save all blocks into the binary */
+
+	for (i = 0; i < blk_count; i++) {
+		if (!_save_block(sbin, stream, i))
+			return FALSE;
+	}
+
+	/* Create the block index */
+	o_stream_seek(stream, block_index);
+	for (i = 0; i < blk_count; i++) {
+		if (!_save_block_index_record(sbin, stream, i))
+			return FALSE;
+	}
+
+	return TRUE;
+}
+
+static int
+sieve_binary_do_save(struct sieve_binary *sbin, const char *path, bool update,
+		     mode_t save_mode, enum sieve_error *error_r)
+{
+	int result, fd;
+	string_t *temp_path;
+	struct ostream *stream;
+	struct sieve_binary_extension_reg *const *regs;
+	unsigned int ext_count, i;
+
+	if (error_r != NULL)
+		*error_r = SIEVE_ERROR_NONE;
+
+	/* Check whether saving is necessary */
+	if (!update && sbin->path != NULL && strcmp(sbin->path, path) == 0) {
+		e_debug(sbin->event, "save: "
+			"not saving binary, because it is already stored");
+		return 0;
+	}
+
+	/* Open it as temp file first, as not to overwrite an existing just yet */
+	temp_path = t_str_new(256);
+	str_append(temp_path, path);
+	str_append_c(temp_path, '.');
+	fd = safe_mkstemp_hostpid(temp_path, save_mode, (uid_t)-1, (gid_t)-1);
+	if (fd < 0) {
+		if (errno == EACCES) {
+			e_error(sbin->event, "save: "
+				"failed to create temporary file: %s",
+				eacces_error_get_creating("open",
+							  str_c(temp_path)));
+			if (error_r != NULL)
+				*error_r = SIEVE_ERROR_NO_PERMISSION;
+		} else {
+			e_error(sbin->event, "save: "
+				"failed to create temporary file: "
+				"open(%s) failed: %m", str_c(temp_path));
+			if (error_r != NULL)
+				*error_r = SIEVE_ERROR_TEMP_FAILURE;
+		}
+		return -1;
+	}
+
+	/* Signal all extensions that we're about to save the binary */
+	regs = array_get(&sbin->extensions, &ext_count);
+	for (i = 0; i < ext_count; i++) {
+		const struct sieve_binary_extension *binext = regs[i]->binext;
+
+		if (binext != NULL && binext->binary_pre_save != NULL &&
+		    !binext->binary_pre_save(regs[i]->extension, sbin,
+					     regs[i]->context, error_r))
+			return -1;
+	}
+
+	/* Save binary */
+	result = 1;
+	stream = o_stream_create_fd(fd, 0);
+	if (!sieve_binary_save_to_stream(sbin, stream)) {
+		result = -1;
+		if (error_r != NULL)
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+	}
+	o_stream_destroy(&stream);
+
+	/* Close saved binary */
+	if (close(fd) < 0) {
+		e_error(sbin->event, "save: "
+			"failed to close temporary file: "
+			"close(fd=%s) failed: %m", str_c(temp_path));
+	}
+
+	/* Replace any original binary atomically */
+	if (result > 0 && (rename(str_c(temp_path), path) < 0)) {
+		if (errno == EACCES) {
+			e_error(sbin->event, "save: "
+				"failed to save binary: %s",
+				eacces_error_get_creating("rename", path));
+			if (error_r != NULL)
+				*error_r = SIEVE_ERROR_NO_PERMISSION;
+		} else {
+			e_error(sbin->event, "save: "
+				"failed to save binary: "
+				"rename(%s, %s) failed: %m",
+				str_c(temp_path), path);
+			if (error_r != NULL)
+				*error_r = SIEVE_ERROR_TEMP_FAILURE;
+		}
+		result = -1;
+	}
+
+	if (result < 0) {
+		/* Get rid of temp output (if any) */
+		if (unlink(str_c(temp_path)) < 0 && errno != ENOENT) {
+			e_error(sbin->event, "save: "
+				"failed to clean up after error: "
+				"unlink(%s) failed: %m", str_c(temp_path));
+		}
+	} else {
+		if (sbin->path == NULL)
+			sbin->path = p_strdup(sbin->pool, path);
+
+		/* Signal all extensions that we successfully saved the binary.
+		 */
+		regs = array_get(&sbin->extensions, &ext_count);
+		for (i = 0; i < ext_count; i++) {
+			const struct sieve_binary_extension *binext =
+				regs[i]->binext;
+
+			if (binext != NULL &&
+			    binext->binary_post_save != NULL &&
+			    !binext->binary_post_save(regs[i]->extension, sbin,
+						      regs[i]->context,
+						      error_r)) {
+				result = -1;
+				break;
+			}
+		}
+
+		if (result < 0 && unlink(path) < 0 && errno != ENOENT) {
+			e_error(sbin->event, "failed to clean up after error: "
+				"unlink(%s) failed: %m", path);
+		}
+	}
+
+	return result;
+}
+
+int sieve_binary_save(struct sieve_binary *sbin, const char *path, bool update,
+		      mode_t save_mode, enum sieve_error *error_r)
+{
+	int ret;
+
+	sieve_binary_update_event(sbin, path);
+	ret = sieve_binary_do_save(sbin, path, update, save_mode, error_r);
+	sieve_binary_update_event(sbin, NULL);
+
+	return ret;
+}
+
+
+/*
+ * Binary file management
+ */
+
+static int
+sieve_binary_fd_open(struct sieve_binary *sbin, const char *path,
+		     int open_flags, enum sieve_error *error_r)
+{
+	int fd;
+
+	if (error_r != NULL)
+		*error_r = SIEVE_ERROR_NONE;
+
+	fd = open(path, open_flags);
+	if (fd < 0) {
+		switch (errno) {
+		case ENOENT:
+			if (error_r != NULL)
+				*error_r = SIEVE_ERROR_NOT_FOUND;
+			break;
+		case EACCES:
+			e_error(sbin->event, "open: "
+				"failed to open: %s",
+				eacces_error_get("open", path));
+			if (error_r != NULL)
+				*error_r = SIEVE_ERROR_NO_PERMISSION;
+			break;
+		default:
+			e_error(sbin->event, "open: "
+				"failed to open: open(%s) failed: %m", path);
+			if (error_r != NULL)
+				*error_r = SIEVE_ERROR_TEMP_FAILURE;
+			break;
+		}
+		return -1;
+	}
+	return fd;
+}
+
+static int
+sieve_binary_file_open(struct sieve_binary *sbin, const char *path,
+		       struct sieve_binary_file **file_r,
+		       enum sieve_error *error_r)
+{
+	int fd, ret = 0;
+	struct stat st;
+
+	if (error_r != NULL)
+		*error_r = SIEVE_ERROR_NONE;
+
+	fd = sieve_binary_fd_open(sbin, path, O_RDONLY, error_r);
+	if (fd < 0)
+		return -1;
+	
+	if (fstat(fd, &st) < 0) {
+		if (errno != ENOENT)
+			e_error(sbin->event, "open: fstat() failed: %m");
+		ret = -1;
+	}
+
+	if (ret == 0 && !S_ISREG(st.st_mode)) {
+		e_error(sbin->event, "open: "
+			"binary is not a regular file");
+		ret = -1;
+	}
+
+	if (ret < 0) {
+		if (close(fd) < 0) {
+			e_error(sbin->event, "open: "
+				"close() failed after error: %m");
+		}
+		return -1;
+	}
+
+	pool_t pool;
+	struct sieve_binary_file *file;
+
+	pool = pool_alloconly_create("sieve_binary_file", 4096);
+	file = p_new(pool, struct sieve_binary_file, 1);
+	file->pool = pool;
+	file->path = p_strdup(pool, path);
+	file->fd = fd;
+	file->st = st;
+	file->sbin = sbin;
+
+	*file_r = file;
+	return 0;
+}
+
+void sieve_binary_file_close(struct sieve_binary_file **_file)
+{
+	struct sieve_binary_file *file = *_file;
+
+	*_file = NULL;
+	if (file == NULL)
+		return;
+
+	if (file->fd != -1) {
+		if (close(file->fd) < 0) {
+			e_error(file->sbin->event, "close: "
+				"failed to close: close() failed: %m");
+		}
+	}
+
+	pool_unref(&file->pool);
+}
+
+static int
+sieve_binary_file_read(struct sieve_binary_file *file, off_t *offset,
+		       void *buffer, size_t size)
+{
+	struct sieve_binary *sbin = file->sbin;
+	int ret;
+	void *indata = buffer;
+	size_t insize = size;
+
+	*offset = SIEVE_BINARY_ALIGN(*offset);
+
+	/* Seek to the correct position */
+	if (*offset != file->offset &&
+	    lseek(file->fd, *offset, SEEK_SET) == (off_t)-1) {
+		e_error(sbin->event, "read: "
+			"failed to seek(fd, %lld, SEEK_SET): %m",
+			(long long) *offset);
+		return -1;
+	}
+
+	/* Read record into memory */
+	while (insize > 0) {
+		ret = read(file->fd, indata, insize);
+		if (ret <= 0) {
+			if (ret == 0) {
+				e_error(sbin->event, "read: "
+					"binary is truncated "
+					"(more data expected)");
+			} else {
+				e_error(sbin->event, "read: "
+					"failed to read from binary: %m");
+			}
+			break;
+		}
+
+		indata = PTR_OFFSET(indata, ret);
+		insize -= ret;
+	}
+
+	if (insize != 0) {
+		/* Failed to read the whole requested record */
+		return 0;
+	}
+
+	*offset += size;
+	file->offset = *offset;
+	return 1;
+}
+
+static const void *
+sieve_binary_file_load_data(struct sieve_binary_file *file,
+			    off_t *offset, size_t size)
+{
+	void *data = t_malloc_no0(size);
+
+	if (sieve_binary_file_read(file, offset, data, size) > 0)
+		return data;
+
+	return NULL;
+}
+
+static buffer_t *
+sieve_binary_file_load_buffer(struct sieve_binary_file *file,
+			      off_t *offset, size_t size)
+{
+	buffer_t *buffer = buffer_create_dynamic(file->pool, size);
+
+	if (sieve_binary_file_read(file, offset,
+				   buffer_get_space_unsafe(buffer, 0, size),
+				   size) > 0)
+		return buffer;
+
+	return NULL;
+}
+
+/*
+ * Load binary from a file
+ */
+
+#define LOAD_HEADER(sbin, offset, header) \
+	(header *)sieve_binary_file_load_data(sbin->file, offset, \
+					      sizeof(header))
+
+bool sieve_binary_load_block(struct sieve_binary_block *sblock)
+{
+	struct sieve_binary *sbin = sblock->sbin;
+	unsigned int id = sblock->id;
+	off_t offset = sblock->offset;
+	const struct sieve_binary_block_header *header =
+		LOAD_HEADER(sbin, &offset,
+			    const struct sieve_binary_block_header);
+
+	if (header == NULL) {
+		e_error(sbin->event, "load: binary is corrupt: "
+			"failed to read header of block %d", id);
+		return FALSE;
+	}
+
+	if (header->id != id) {
+		e_error(sbin->event, "load: binary is corrupt: "
+			"header of block %d has non-matching id %d",
+			id, header->id);
+		return FALSE;
+	}
+
+	sblock->data = sieve_binary_file_load_buffer(sbin->file, &offset,
+						     header->size);
+	if (sblock->data == NULL) {
+		e_error(sbin->event, "load: "
+			"failed to read block %d of binary (size=%d)",
+			id, header->size);
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+static bool
+_read_block_index_record(struct sieve_binary *sbin, off_t *offset,
+			 unsigned int id)
+{
+	const struct sieve_binary_block_index *record =
+		LOAD_HEADER(sbin, offset,
+			    const struct sieve_binary_block_index);
+	struct sieve_binary_block *block;
+
+	if (record == NULL) {
+		e_error(sbin->event, "open: binary is corrupt: "
+			"failed to load block index record %d", id);
+		return FALSE;
+	}
+
+	if (record->id != id) {
+		e_error(sbin->event, "open: binary is corrupt: "
+			"block index record %d has unexpected id %d",
+			id, record->id);
+		return FALSE;
+	}
+
+	block = sieve_binary_block_create_id(sbin, id);
+	block->ext_index = record->ext_id;
+	block->offset = record->offset;
+
+	return TRUE;
+}
+
+static int _read_extensions(struct sieve_binary_block *sblock)
+{
+	struct sieve_binary *sbin = sblock->sbin;
+	sieve_size_t offset = 0;
+	unsigned int i, count;
+	int result = 1;
+
+	if (!sieve_binary_read_unsigned(sblock, &offset, &count))
+		return -1;
+
+	for (i = 0; result > 0 && i < count; i++) {
+		T_BEGIN {
+			string_t *extension;
+			const struct sieve_extension *ext;
+			unsigned int version;
+
+			if (sieve_binary_read_string(sblock, &offset,
+						     &extension)) {
+				ext = sieve_extension_get_by_name(
+					sbin->svinst, str_c(extension));
+
+				if (ext == NULL) {
+					e_error(sbin->event, "open: "
+						"binary requires unknown extension `%s'",
+						str_sanitize(str_c(extension), 128));
+					result = 0;
+				} else {
+					struct sieve_binary_extension_reg *ereg = NULL;
+
+					(void)sieve_binary_extension_register(sbin, ext, &ereg);
+					if (!sieve_binary_read_unsigned(sblock, &offset, &version) ||
+					    !sieve_binary_read_unsigned(sblock, &offset, &ereg->block_id)) {
+						result = -1;
+					} else if (!sieve_extension_version_is(ext, version)) {
+						e_debug(sbin->event, "open: "
+							"binary was compiled with different version "
+							"of the `%s' extension (compiled v%d, expected v%d;"
+							"automatically fixed when re-compiled)",
+							sieve_extension_name(ext), version,
+							sieve_extension_version(ext));
+						result = 0;
+					}
+				}
+			} else {
+				result = -1;
+			}
+		} T_END;
+	}
+
+	return result;
+}
+
+static bool
+_sieve_binary_open(struct sieve_binary *sbin, enum sieve_error *error_r)
+{
+	bool result = TRUE;
+	off_t offset = 0;
+	struct sieve_binary_block *ext_block;
+	unsigned int i;
+	int ret;
+
+	/* Read header */
+
+	ret = sieve_binary_file_read_header(sbin, sbin->file->fd,
+					    &sbin->header, error_r);
+	if (ret < 0)
+		return FALSE;
+	offset = sbin->header.hdr_size;
+
+	/* Load block index */
+
+	for (i = 0; i < sbin->header.blocks && result; i++) {
+		T_BEGIN {
+			if (!_read_block_index_record(sbin, &offset, i))
+				result = FALSE;
+		} T_END;
+	}
+
+	if (!result) {
+		if (error_r != NULL)
+			*error_r = SIEVE_ERROR_NOT_VALID;
+		return FALSE;
+	}
+
+	/* Load extensions used by this binary */
+
+	T_BEGIN {
+		ext_block = sieve_binary_block_get(
+			sbin, SBIN_SYSBLOCK_EXTENSIONS);
+		if (ext_block == NULL) {
+			result = FALSE;
+		} else if ((ret = _read_extensions(ext_block)) <= 0) {
+			if (ret < 0) {
+				e_error(sbin->event, "open: binary is corrupt: "
+					"failed to load extension block");
+			}
+			result = FALSE;
+		}
+	} T_END;
+
+	if (!result) {
+		if (error_r != NULL)
+			*error_r = SIEVE_ERROR_NOT_VALID;
+		return FALSE;
+	}
+	return TRUE;
+}
+
+struct sieve_binary *
+sieve_binary_open(struct sieve_instance *svinst, const char *path,
+		  struct sieve_script *script, enum sieve_error *error_r)
+{
+	struct sieve_binary_extension_reg *const *regs;
+	unsigned int ext_count, i;
+	struct sieve_binary *sbin;
+	struct sieve_binary_file *file;
+
+	i_assert(script == NULL || sieve_script_svinst(script) == svinst);
+
+	/* Create binary object */
+	sbin = sieve_binary_create(svinst, script);
+	sbin->path = p_strdup(sbin->pool, path);
+
+	if (sieve_binary_file_open(sbin, path, &file, error_r) < 0) {
+		sieve_binary_unref(&sbin);
+		return NULL;
+	}
+
+	sbin->file = file;
+
+	event_set_append_log_prefix(
+		sbin->event,
+		t_strdup_printf("binary %s: ", path));
+
+	if (!_sieve_binary_open(sbin, error_r)) {
+		sieve_binary_unref(&sbin);
+		return NULL;
+	}
+
+	sieve_binary_activate(sbin);
+
+	/* Signal open event to extensions */
+	regs = array_get(&sbin->extensions, &ext_count);
+	for (i = 0; i < ext_count; i++) {
+		const struct sieve_binary_extension *binext = regs[i]->binext;
+
+		if (binext != NULL && binext->binary_open != NULL &&
+		    !binext->binary_open(regs[i]->extension, sbin,
+					 regs[i]->context)) {
+			/* Extension thinks its corrupt */
+			if (error_r != NULL)
+				*error_r = SIEVE_ERROR_NOT_VALID;
+			sieve_binary_unref(&sbin);
+			return NULL;
+		}
+	}
+	return sbin;
+}
+
+int sieve_binary_check_executable(struct sieve_binary *sbin,
+				  enum sieve_error *error_r,
+				  const char **client_error_r)
+{
+	if (error_r != NULL)
+		*error_r = SIEVE_ERROR_NONE;
+	*client_error_r = NULL;
+
+	if (HAS_ALL_BITS(sbin->header.flags,
+			 SIEVE_BINARY_FLAG_RESOURCE_LIMIT)) {
+		e_debug(sbin->event,
+			"Binary execution is blocked: "
+			"Cumulative resource usage limit exceeded "
+			"(resource limit flag is set)");
+		if (error_r != NULL)
+			*error_r = SIEVE_ERROR_RESOURCE_LIMIT;
+		*client_error_r = "cumulative resource usage limit exceeded";
+		return 0;
+	}
+	return 1;
+}
+
+/*
+ * Resource usage
+ */
+
+static int
+sieve_binary_file_do_update_resource_usage(
+	struct sieve_binary *sbin, int fd, enum sieve_error *error_r)
+{
+	struct sieve_binary_header *header = &sbin->header;
+	struct file_lock *lock;
+	const char *error;
+	int ret;
+
+	struct file_lock_settings lock_set = {
+		.lock_method = FILE_LOCK_METHOD_FCNTL,
+	};
+	ret = file_wait_lock(fd, sbin->path, F_WRLCK, &lock_set,
+			     SIEVE_BINARY_FILE_LOCK_TIMEOUT, &lock, &error);
+	if (ret <= 0) {
+		e_error(sbin->event, "%s", error);
+		*error_r = SIEVE_ERROR_TEMP_FAILURE;
+		return -1;
+	}
+
+	ret = sieve_binary_file_read_header(sbin, fd, header, error_r);
+	if (ret == 0) {
+		sieve_binary_file_update_header(sbin);
+		ret = sieve_binary_file_write_header(sbin, fd, header, error_r);
+	}
+
+	file_lock_free(&lock);
+
+	return ret;
+}
+
+int sieve_binary_file_update_resource_usage(struct sieve_binary *sbin,
+					    enum sieve_error *error_r)
+{
+	enum sieve_error error;
+	int fd, ret = 0;
+
+	if (error_r == NULL)
+		error_r = &error;
+	*error_r = SIEVE_ERROR_NONE;
+
+	sieve_binary_file_close(&sbin->file);
+
+	if (sbin->path == NULL)
+		return 0;
+	if (sbin->header.version_major != SIEVE_BINARY_VERSION_MAJOR)
+		return sieve_binary_save(sbin, sbin->path, TRUE, 0600, error_r);
+
+	fd = sieve_binary_fd_open(sbin, sbin->path, O_RDWR, error_r);
+	if (fd < 0)
+		return -1;
+
+	ret = sieve_binary_file_do_update_resource_usage(sbin, fd, error_r);
+
+	if (close(fd) < 0) {
+		e_error(sbin->event, "update: "
+			"failed to close: close() failed: %m");
+	}
+
+	return ret;
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-binary-private.h b/pigeonhole/src/lib-sieve/sieve-binary-private.h
new file mode 100644
index 0000000..73d2d75
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-binary-private.h
@@ -0,0 +1,240 @@
+#ifndef SIEVE_BINARY_PRIVATE_H
+#define SIEVE_BINARY_PRIVATE_H
+
+#include "sieve-common.h"
+#include "sieve-binary.h"
+#include "sieve-extensions.h"
+
+#include <sys/stat.h>
+
+#define SIEVE_BINARY_FILE_LOCK_TIMEOUT 10
+
+/*
+ * Binary file
+ */
+
+enum SIEVE_BINARY_FLAGS {
+	SIEVE_BINARY_FLAG_RESOURCE_LIMIT = BIT(0),
+};
+
+struct sieve_binary_header {
+	uint32_t magic;
+	uint16_t version_major;
+	uint16_t version_minor;
+	uint32_t blocks;
+
+	uint32_t hdr_size;
+	uint32_t flags;
+
+	struct {
+		uint64_t update_time;
+		uint32_t cpu_time_msecs;
+	} resource_usage;
+};
+
+struct sieve_binary_file {
+	pool_t pool;
+	const char *path;
+	struct sieve_binary *sbin;
+
+	struct stat st;
+	int fd;
+	off_t offset;
+};
+
+void sieve_binary_file_close(struct sieve_binary_file **_file);
+
+/*
+ * Internal structures
+ */
+
+/* Extension registration */
+
+struct sieve_binary_extension_reg {
+	/* The identifier of the extension within this binary */
+	int index;
+
+	/* Global extension object */
+	const struct sieve_extension *extension;
+
+	/* Extension to the binary; typically used to manage extension-specific
+	   blocks in the binary and as a means to get a binary_free notification
+	   to release references held by extensions.
+	 */
+	const struct sieve_binary_extension *binext;
+
+	/* Context data associated to the binary by this extension */
+	void *context;
+
+	/* Main block for this extension */
+	unsigned int block_id;
+};
+
+/* Block */
+
+struct sieve_binary_block {
+	struct sieve_binary *sbin;
+	unsigned int id;
+	int ext_index;
+
+	buffer_t *data;
+
+	uoff_t offset;
+};
+
+/*
+ * Binary object
+ */
+
+struct sieve_binary {
+	pool_t pool;
+	int refcount;
+	struct sieve_instance *svinst;
+	struct event *event;
+
+	struct sieve_script *script;
+
+	struct sieve_binary_file *file;
+	struct sieve_binary_header header;
+	struct sieve_resource_usage rusage;
+
+	/* When the binary is loaded into memory or when it is being constructed
+	   by the generator, extensions can be associated to the binary. The
+	   extensions array is a sequential list of all linked extensions. The
+	   extension_index array is a mapping ext_id -> binary_extension. This
+	   is used to obtain the index code associated with an extension for
+	   this particular binary. The linked_extensions list all extensions
+	   linked to this binary object other than the preloaded language
+	   features implemented as 'extensions'.
+
+	   All arrays refer to the same extension registration objects. Upon
+	   loading a binary, the 'require'd extensions will sometimes need to
+	   associate context data to the binary object in memory. This is stored
+	   in these registration objects as well.
+	 */
+	ARRAY(struct sieve_binary_extension_reg *) extensions;
+	ARRAY(struct sieve_binary_extension_reg *) extension_index;
+	ARRAY(struct sieve_binary_extension_reg *) linked_extensions;
+
+	/* Attributes of a loaded binary */
+	const char *path;
+
+	/* Blocks */
+	ARRAY(struct sieve_binary_block *) blocks;
+
+	bool rusage_updated:1;
+};
+
+void sieve_binary_update_event(struct sieve_binary *sbin, const char *new_path)
+			       ATTR_NULL(2);
+
+struct sieve_binary *
+sieve_binary_create(struct sieve_instance *svinst, struct sieve_script *script);
+
+/* Blocks management */
+
+static inline struct sieve_binary_block *
+sieve_binary_block_index(struct sieve_binary *sbin, unsigned int id)
+{
+	struct sieve_binary_block * const *sblock;
+
+	if (id >= array_count(&sbin->blocks))
+		return NULL;
+
+	sblock = array_idx(&sbin->blocks, id);
+	if (*sblock == NULL)
+		return NULL;
+	return *sblock;
+}
+
+static inline size_t
+_sieve_binary_block_get_size(const struct sieve_binary_block *sblock)
+{
+	return buffer_get_used_size(sblock->data);
+}
+
+struct sieve_binary_block *
+sieve_binary_block_create_id(struct sieve_binary *sbin, unsigned int id);
+
+buffer_t *sieve_binary_block_get_buffer(struct sieve_binary_block *sblock);
+
+/* Extension registration */
+
+static inline struct sieve_binary_extension_reg *
+sieve_binary_extension_create_reg(struct sieve_binary *sbin,
+				  const struct sieve_extension *ext)
+{
+	int index = array_count(&sbin->extensions);
+	struct sieve_binary_extension_reg *ereg;
+
+	if (ext->id < 0)
+		return NULL;
+
+	ereg = p_new(sbin->pool, struct sieve_binary_extension_reg, 1);
+	ereg->index = index;
+	ereg->extension = ext;
+
+	array_idx_set(&sbin->extensions, (unsigned int) index, &ereg);
+	array_idx_set(&sbin->extension_index, (unsigned int) ext->id, &ereg);
+
+	return ereg;
+}
+
+static inline struct sieve_binary_extension_reg *
+sieve_binary_extension_get_reg(struct sieve_binary *sbin,
+			       const struct sieve_extension *ext,
+			       bool create)
+{
+	struct sieve_binary_extension_reg *reg = NULL;
+
+	if (ext->id >= 0 &&
+	    ext->id < (int)array_count(&sbin->extension_index)) {
+		struct sieve_binary_extension_reg * const *ereg =
+			array_idx(&sbin->extension_index,
+				  (unsigned int)ext->id);
+
+		reg = *ereg;
+	}
+
+	/* Register if not known */
+	if (reg == NULL && create)
+		return sieve_binary_extension_create_reg(sbin, ext);
+	return reg;
+}
+
+static inline int
+sieve_binary_extension_register(struct sieve_binary *sbin,
+				const struct sieve_extension *ext,
+				struct sieve_binary_extension_reg **reg_r)
+{
+	struct sieve_binary_extension_reg *ereg;
+
+	if ((ereg = sieve_binary_extension_get_reg(sbin, ext, FALSE)) == NULL) {
+		ereg = sieve_binary_extension_create_reg(sbin, ext);
+
+		if (ereg == NULL)
+			return -1;
+
+		array_append(&sbin->linked_extensions, &ereg, 1);
+	}
+
+	if (reg_r != NULL)
+		*reg_r = ereg;
+	return ereg->index;
+}
+
+/* Load/Save */
+
+bool sieve_binary_load_block(struct sieve_binary_block *);
+
+/*
+ * Resource limits
+ */
+
+bool sieve_binary_check_resource_usage(struct sieve_binary *sbin);
+
+int sieve_binary_file_update_resource_usage(struct sieve_binary *sbin,
+					    enum sieve_error *error_r)
+					    ATTR_NULL(2);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-binary.c b/pigeonhole/src/lib-sieve/sieve-binary.c
new file mode 100644
index 0000000..06cf598
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-binary.c
@@ -0,0 +1,606 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "mempool.h"
+#include "buffer.h"
+#include "hash.h"
+#include "array.h"
+#include "ostream.h"
+#include "eacces-error.h"
+#include "safe-mkstemp.h"
+
+#include "sieve-error.h"
+#include "sieve-extensions.h"
+#include "sieve-code.h"
+#include "sieve-script.h"
+
+#include "sieve-binary-private.h"
+
+/*
+ * Forward declarations
+ */
+
+static inline struct sieve_binary_extension_reg *
+sieve_binary_extension_get_reg(struct sieve_binary *sbin,
+			       const struct sieve_extension *ext, bool create);
+
+static inline int
+sieve_binary_extension_register(struct sieve_binary *sbin,
+				const struct sieve_extension *ext,
+				struct sieve_binary_extension_reg **reg);
+
+/*
+ * Binary object
+ */
+
+void sieve_binary_update_event(struct sieve_binary *sbin, const char *new_path)
+{
+	if (new_path != NULL) {
+		event_set_append_log_prefix(
+			sbin->event, t_strdup_printf("binary %s: ", new_path));
+	} else if (sbin->path != NULL) {
+		event_set_append_log_prefix(
+			sbin->event,
+			t_strdup_printf("binary %s: ", sbin->path));
+	} else if (sbin->script != NULL) {
+		event_set_append_log_prefix(
+			sbin->event,
+			t_strdup_printf("binary %s: ",
+					sieve_script_name(sbin->script)));
+	} else {
+		event_set_append_log_prefix(sbin->event, "binary: ");
+	}
+}
+
+struct sieve_binary *
+sieve_binary_create(struct sieve_instance *svinst, struct sieve_script *script)
+{
+	pool_t pool;
+	struct sieve_binary *sbin;
+	const struct sieve_extension *const *ext_preloaded;
+	unsigned int i, ext_count;
+
+	pool = pool_alloconly_create("sieve_binary", 16384);
+	sbin = p_new(pool, struct sieve_binary, 1);
+	sbin->pool = pool;
+	sbin->refcount = 1;
+	sbin->svinst = svinst;
+
+	sbin->header.version_major = SIEVE_BINARY_VERSION_MAJOR;
+	sbin->header.version_minor = SIEVE_BINARY_VERSION_MINOR;
+
+	sbin->script = script;
+	if (script != NULL)
+		sieve_script_ref(script);
+
+	sbin->event = event_create(svinst->event);
+
+	ext_count = sieve_extensions_get_count(svinst);
+
+	p_array_init(&sbin->linked_extensions, pool, ext_count);
+	p_array_init(&sbin->extensions, pool, ext_count);
+	p_array_init(&sbin->extension_index, pool, ext_count);
+
+	p_array_init(&sbin->blocks, pool, 16);
+
+	/* Pre-load core language features implemented as 'extensions' */
+	ext_preloaded = sieve_extensions_get_preloaded(svinst, &ext_count);
+	for (i = 0; i < ext_count; i++) {
+		const struct sieve_extension_def *ext_def = ext_preloaded[i]->def;
+
+		if (ext_def != NULL && ext_def->binary_load != NULL)
+			(void)ext_def->binary_load(ext_preloaded[i], sbin);
+	}
+
+	return sbin;
+}
+
+struct sieve_binary *sieve_binary_create_new(struct sieve_script *script)
+{
+	struct sieve_binary *sbin =
+		sieve_binary_create(sieve_script_svinst(script), script);
+	struct sieve_binary_block *sblock;
+	unsigned int i;
+
+	sieve_binary_update_event(sbin, NULL);
+
+	/* Create script metadata block */
+	sblock = sieve_binary_block_create(sbin);
+	sieve_script_binary_write_metadata(script, sblock);
+
+	/* Create other system blocks */
+	for (i = 1; i < SBIN_SYSBLOCK_LAST; i++)
+		(void)sieve_binary_block_create(sbin);
+
+	return sbin;
+}
+
+void sieve_binary_ref(struct sieve_binary *sbin)
+{
+	sbin->refcount++;
+}
+
+static inline void sieve_binary_extensions_free(struct sieve_binary *sbin)
+{
+	struct sieve_binary_extension_reg *const *regs;
+	unsigned int ext_count, i;
+
+	/* Cleanup binary extensions */
+	regs = array_get(&sbin->extensions, &ext_count);
+	for (i = 0; i < ext_count; i++) {
+		const struct sieve_binary_extension *binext = regs[i]->binext;
+
+		if (binext != NULL && binext->binary_free != NULL) {
+			binext->binary_free(regs[i]->extension, sbin,
+					    regs[i]->context);
+		}
+	}
+}
+
+static void sieve_binary_update_resource_usage(struct sieve_binary *sbin)
+{
+	enum sieve_error error;
+
+	if (sbin->rusage_updated)
+		(void)sieve_binary_file_update_resource_usage(sbin, &error);
+	sbin->rusage_updated = FALSE;
+}
+
+void sieve_binary_unref(struct sieve_binary **_sbin)
+{
+	struct sieve_binary *sbin = *_sbin;
+
+	*_sbin = NULL;
+	if (sbin == NULL)
+		return;
+
+	i_assert(sbin->refcount > 0);
+	if (--sbin->refcount != 0)
+		return;
+
+	sieve_binary_file_close(&sbin->file);
+	sieve_binary_update_resource_usage(sbin);
+	sieve_binary_extensions_free(sbin);
+
+	if (sbin->script != NULL)
+		sieve_script_unref(&sbin->script);
+
+	event_unref(&sbin->event);
+	pool_unref(&sbin->pool);
+}
+
+void sieve_binary_close(struct sieve_binary **_sbin)
+{
+	struct sieve_binary *sbin = *_sbin;
+
+	*_sbin = NULL;
+	if (sbin == NULL)
+		return;
+
+	sieve_binary_file_close(&sbin->file);
+	sieve_binary_update_resource_usage(sbin);
+	sieve_binary_unref(&sbin);
+}
+
+/*
+ * Resource usage
+ */
+
+void sieve_binary_get_resource_usage(struct sieve_binary *sbin,
+				     struct sieve_resource_usage *rusage_r)
+{
+	struct sieve_binary_header *header = &sbin->header;
+	time_t update_time = header->resource_usage.update_time;
+	unsigned int timeout = sbin->svinst->resource_usage_timeout_secs;
+
+	if (update_time != 0 && (ioloop_time - update_time) > timeout)
+		i_zero(&header->resource_usage);
+
+	sieve_resource_usage_init(rusage_r);
+	rusage_r->cpu_time_msecs = header->resource_usage.cpu_time_msecs;
+	sieve_resource_usage_add(rusage_r, &sbin->rusage);
+}
+
+bool sieve_binary_check_resource_usage(struct sieve_binary *sbin)
+{
+	struct sieve_binary_header *header = &sbin->header;
+	struct sieve_resource_usage rusage;
+
+	sieve_binary_get_resource_usage(sbin, &rusage);
+
+	if (sieve_resource_usage_is_excessive(sbin->svinst, &rusage)) {
+		header->flags |= SIEVE_BINARY_FLAG_RESOURCE_LIMIT;
+		return FALSE;
+	}
+	return TRUE;
+}
+
+bool sieve_binary_record_resource_usage(
+	struct sieve_binary *sbin, const struct sieve_resource_usage *rusage)
+{
+	struct sieve_resource_usage rusage_total;
+
+	if (sbin == NULL)
+		return TRUE;
+	if (!sieve_resource_usage_is_high(sbin->svinst, rusage))
+		return TRUE;
+
+	sieve_resource_usage_add(&sbin->rusage, rusage);
+	sbin->rusage_updated = TRUE;
+
+	sieve_binary_get_resource_usage(sbin, &rusage_total);
+
+	e_debug(sbin->event, "Updated cumulative resource usage: %s",
+		sieve_resource_usage_get_summary(&rusage_total));
+
+	return sieve_binary_check_resource_usage(sbin);
+}
+
+void sieve_binary_set_resource_usage(struct sieve_binary *sbin,
+				     const struct sieve_resource_usage *rusage)
+{
+	struct sieve_binary_header *header = &sbin->header;
+
+	i_zero(&header->resource_usage);
+	sbin->rusage = *rusage;
+	sbin->rusage_updated = TRUE;
+
+	(void)sieve_binary_check_resource_usage(sbin);
+}
+
+/*
+ * Accessors
+ */
+
+pool_t sieve_binary_pool(struct sieve_binary *sbin)
+{
+	return sbin->pool;
+}
+
+struct sieve_script *sieve_binary_script(struct sieve_binary *sbin)
+{
+	return sbin->script;
+}
+
+const char *sieve_binary_path(struct sieve_binary *sbin)
+{
+	return sbin->path;
+}
+
+bool sieve_binary_saved(struct sieve_binary *sbin)
+{
+	return (sbin->path != NULL);
+}
+
+bool sieve_binary_loaded(struct sieve_binary *sbin)
+{
+	return (sbin->file != NULL);
+}
+
+const char *sieve_binary_source(struct sieve_binary *sbin)
+{
+	if (sbin->script != NULL && (sbin->path == NULL || sbin->file == NULL))
+		return sieve_script_location(sbin->script);
+
+	return sbin->path;
+}
+
+struct sieve_instance *sieve_binary_svinst(struct sieve_binary *sbin)
+{
+	return sbin->svinst;
+}
+
+time_t sieve_binary_mtime(struct sieve_binary *sbin)
+{
+	i_assert(sbin->file != NULL);
+	return sbin->file->st.st_mtime;
+}
+
+const struct stat *sieve_binary_stat(struct sieve_binary *sbin)
+{
+	i_assert(sbin->file != NULL);
+	return &sbin->file->st;
+}
+
+const char *sieve_binary_script_name(struct sieve_binary *sbin)
+{
+	return (sbin->script == NULL ?
+		NULL : sieve_script_name(sbin->script));
+}
+
+const char *sieve_binary_script_location(struct sieve_binary *sbin)
+{
+	return (sbin->script == NULL ?
+		NULL : sieve_script_location(sbin->script));
+}
+
+/*
+ * Utility
+ */
+
+const char *sieve_binfile_from_name(const char *name)
+{
+	return t_strconcat(name, "."SIEVE_BINARY_FILEEXT, NULL);
+}
+
+/*
+ * Block management
+ */
+
+unsigned int sieve_binary_block_count(struct sieve_binary *sbin)
+{
+	return array_count(&sbin->blocks);
+}
+
+struct sieve_binary_block *sieve_binary_block_create(struct sieve_binary *sbin)
+{
+	unsigned int id = sieve_binary_block_count(sbin);
+	struct sieve_binary_block *sblock;
+
+	sblock = p_new(sbin->pool, struct sieve_binary_block, 1);
+	sblock->data = buffer_create_dynamic(sbin->pool, 64);
+	sblock->sbin = sbin;
+	sblock->id = id;
+
+	array_append(&sbin->blocks, &sblock, 1);
+
+	return sblock;
+}
+
+struct sieve_binary_block *
+sieve_binary_block_create_id(struct sieve_binary *sbin, unsigned int id)
+{
+	struct sieve_binary_block *sblock;
+
+	sblock = p_new(sbin->pool, struct sieve_binary_block, 1);
+
+	array_idx_set(&sbin->blocks, id, &sblock);
+	sblock->data = NULL;
+	sblock->sbin = sbin;
+	sblock->id = id;
+
+	return sblock;
+}
+
+static bool sieve_binary_block_fetch(struct sieve_binary_block *sblock)
+{
+	struct sieve_binary *sbin = sblock->sbin;
+
+	if (sbin->file != NULL) {
+		/* Try to acces the block in the binary on disk (apparently we
+		   were lazy)
+		 */
+		if (!sieve_binary_load_block(sblock) || sblock->data == NULL)
+			return FALSE;
+	} else {
+		sblock->data = buffer_create_dynamic(sbin->pool, 64);
+		return TRUE;
+	}
+
+	return TRUE;
+}
+
+struct sieve_binary_block *
+sieve_binary_block_get(struct sieve_binary *sbin, unsigned int id)
+{
+	struct sieve_binary_block *sblock = sieve_binary_block_index(sbin, id);
+
+	if (sblock == NULL)
+		return NULL;
+
+	if (sblock->data == NULL && !sieve_binary_block_fetch(sblock))
+		return NULL;
+
+	return sblock;
+}
+
+void sieve_binary_block_clear(struct sieve_binary_block *sblock)
+{
+	buffer_set_used_size(sblock->data, 0);
+}
+
+buffer_t *sieve_binary_block_get_buffer(struct sieve_binary_block *sblock)
+{
+	if (sblock->data == NULL && !sieve_binary_block_fetch(sblock))
+		return NULL;
+
+	return sblock->data;
+}
+
+struct sieve_binary *
+sieve_binary_block_get_binary(const struct sieve_binary_block *sblock)
+{
+	return sblock->sbin;
+}
+
+unsigned int sieve_binary_block_get_id(const struct sieve_binary_block *sblock)
+{
+	return sblock->id;
+}
+
+size_t sieve_binary_block_get_size(const struct sieve_binary_block *sblock)
+{
+	return _sieve_binary_block_get_size(sblock);
+}
+
+/*
+ * Up-to-date checking
+ */
+
+bool sieve_binary_up_to_date(struct sieve_binary *sbin,
+			     enum sieve_compile_flags cpflags)
+{
+	struct sieve_binary_extension_reg *const *regs;
+	struct sieve_binary_block *sblock;
+	sieve_size_t offset = 0;
+	unsigned int ext_count, i;
+	int ret;
+
+	i_assert(sbin->file != NULL);
+
+	sblock = sieve_binary_block_get(sbin, SBIN_SYSBLOCK_SCRIPT_DATA);
+	if (sblock == NULL || sbin->script == NULL)
+		return FALSE;
+
+	if ((ret = sieve_script_binary_read_metadata(sbin->script, sblock,
+						     &offset)) <= 0) {
+		if (ret < 0) {
+			e_debug(sbin->event, "up-to-date: "
+				"failed to read script metadata from binary");
+		} else {
+			e_debug(sbin->event, "up-to-date: "
+				"script metadata indicates that binary is not up-to-date");
+		}
+		return FALSE;
+	}
+
+	regs = array_get(&sbin->extensions, &ext_count);
+	for (i = 0; i < ext_count; i++) {
+		const struct sieve_binary_extension *binext = regs[i]->binext;
+
+		if (binext != NULL && binext->binary_up_to_date != NULL &&
+		    !binext->binary_up_to_date(regs[i]->extension, sbin,
+					       regs[i]->context, cpflags)) {
+			e_debug(sbin->event, "up-to-date: "
+				"the %s extension indicates binary is not up-to-date",
+				sieve_extension_name(regs[i]->extension));
+			return FALSE;
+		}
+	}
+	return TRUE;
+}
+
+/*
+ * Activate the binary (after code generation)
+ */
+
+void sieve_binary_activate(struct sieve_binary *sbin)
+{
+	struct sieve_binary_extension_reg *const *regs;
+	unsigned int i, ext_count;
+
+	/* Load other extensions into binary */
+	regs = array_get(&sbin->linked_extensions, &ext_count);
+	for (i = 0; i < ext_count; i++) {
+		const struct sieve_extension *ext = regs[i]->extension;
+
+		if (ext != NULL && ext->def != NULL &&
+		    ext->def->binary_load != NULL)
+			ext->def->binary_load(ext, sbin);
+	}
+}
+
+/*
+ * Extension handling
+ */
+
+void sieve_binary_extension_set_context(struct sieve_binary *sbin,
+					const struct sieve_extension *ext,
+					void *context)
+{
+	struct sieve_binary_extension_reg *ereg =
+		sieve_binary_extension_get_reg(sbin, ext, TRUE);
+
+	if (ereg != NULL)
+		ereg->context = context;
+}
+
+const void *
+sieve_binary_extension_get_context(struct sieve_binary *sbin,
+				   const struct sieve_extension *ext)
+{
+	struct sieve_binary_extension_reg *ereg =
+		sieve_binary_extension_get_reg(sbin, ext, TRUE);
+
+	if (ereg != NULL)
+		return ereg->context;
+
+	return NULL;
+}
+
+void sieve_binary_extension_set(struct sieve_binary *sbin,
+				const struct sieve_extension *ext,
+				const struct sieve_binary_extension *bext,
+				void *context)
+{
+	struct sieve_binary_extension_reg *ereg =
+		sieve_binary_extension_get_reg(sbin, ext, TRUE);
+
+	if (ereg != NULL) {
+		ereg->binext = bext;
+
+		if (context != NULL)
+			ereg->context = context;
+	}
+}
+
+struct sieve_binary_block *
+sieve_binary_extension_create_block(struct sieve_binary *sbin,
+				    const struct sieve_extension *ext)
+{
+	struct sieve_binary_block *sblock;
+	struct sieve_binary_extension_reg *ereg =
+		sieve_binary_extension_get_reg(sbin, ext, TRUE);
+
+	i_assert(ereg != NULL);
+
+	sblock = sieve_binary_block_create(sbin);
+
+	if (ereg->block_id < SBIN_SYSBLOCK_LAST)
+		ereg->block_id = sblock->id;
+	sblock->ext_index = ereg->index;
+
+	return sblock;
+}
+
+struct sieve_binary_block *
+sieve_binary_extension_get_block(struct sieve_binary *sbin,
+				 const struct sieve_extension *ext)
+{
+	struct sieve_binary_extension_reg *ereg =
+		sieve_binary_extension_get_reg(sbin, ext, TRUE);
+
+	i_assert(ereg != NULL);
+
+	if (ereg->block_id < SBIN_SYSBLOCK_LAST)
+		return NULL;
+
+	return sieve_binary_block_get(sbin, ereg->block_id);
+}
+
+int sieve_binary_extension_link(struct sieve_binary *sbin,
+				const struct sieve_extension *ext)
+{
+	return sieve_binary_extension_register(sbin, ext, NULL);
+}
+
+const struct sieve_extension *
+sieve_binary_extension_get_by_index(struct sieve_binary *sbin, int index)
+{
+	struct sieve_binary_extension_reg * const *ereg;
+
+	if (index < (int)array_count(&sbin->extensions)) {
+		ereg = array_idx(&sbin->extensions, (unsigned int)index);
+
+		return (*ereg)->extension;
+	}
+
+	return NULL;
+}
+
+int sieve_binary_extension_get_index(struct sieve_binary *sbin,
+				     const struct sieve_extension *ext)
+{
+	struct sieve_binary_extension_reg *ereg =
+		sieve_binary_extension_get_reg(sbin, ext, FALSE);
+
+	return (ereg == NULL ? -1 : ereg->index);
+}
+
+int sieve_binary_extensions_count(struct sieve_binary *sbin)
+{
+	return (int)array_count(&sbin->extensions);
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-binary.h b/pigeonhole/src/lib-sieve/sieve-binary.h
new file mode 100644
index 0000000..0b8b66e
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-binary.h
@@ -0,0 +1,291 @@
+#ifndef SIEVE_BINARY_H
+#define SIEVE_BINARY_H
+
+#include "lib.h"
+
+#include "sieve-common.h"
+
+/*
+ * Config
+ */
+
+#define SIEVE_BINARY_VERSION_MAJOR     2
+#define SIEVE_BINARY_VERSION_MINOR     0
+
+#define SIEVE_BINARY_BASE_HEADER_SIZE  20
+
+/*
+ * Binary object
+ */
+
+struct sieve_binary;
+
+struct sieve_binary *sieve_binary_create_new(struct sieve_script *script);
+void sieve_binary_ref(struct sieve_binary *sbin);
+void sieve_binary_unref(struct sieve_binary **_sbin);
+
+void sieve_binary_close(struct sieve_binary **_sbin);
+
+/*
+ * Resource usage
+ */
+
+void sieve_binary_get_resource_usage(struct sieve_binary *sbin,
+				     struct sieve_resource_usage *rusage_r);
+bool sieve_binary_record_resource_usage(
+	struct sieve_binary *sbin, const struct sieve_resource_usage *rusage)
+	ATTR_NULL(1);
+void sieve_binary_set_resource_usage(struct sieve_binary *sbin,
+				     const struct sieve_resource_usage *rusage);
+/*
+ * Accessors
+ */
+
+pool_t sieve_binary_pool(struct sieve_binary *sbin);
+struct sieve_instance *sieve_binary_svinst(struct sieve_binary *sbin);
+const char *sieve_binary_path(struct sieve_binary *sbin);
+struct sieve_script *sieve_binary_script(struct sieve_binary *sbin);
+
+time_t sieve_binary_mtime(struct sieve_binary *sbin);
+const struct stat *sieve_binary_stat(struct sieve_binary *sbin);
+
+const char *sieve_binary_script_name(struct sieve_binary *sbin);
+const char *sieve_binary_script_location(struct sieve_binary *sbin);
+
+const char *sieve_binary_source(struct sieve_binary *sbin);
+bool sieve_binary_loaded(struct sieve_binary *sbin);
+bool sieve_binary_saved(struct sieve_binary *sbin);
+
+/*
+ * Utility
+ */
+
+const char *sieve_binfile_from_name(const char *name);
+
+/*
+ * Activation after code generation
+ */
+
+void sieve_binary_activate(struct sieve_binary *sbin);
+
+/*
+ * Saving the binary
+ */
+
+int sieve_binary_save(struct sieve_binary *sbin, const char *path, bool update,
+		      mode_t save_mode, enum sieve_error *error_r);
+
+/*
+ * Loading the binary
+ */
+
+struct sieve_binary *
+sieve_binary_open(struct sieve_instance *svinst, const char *path,
+		  struct sieve_script *script, enum sieve_error *error_r);
+bool sieve_binary_up_to_date(struct sieve_binary *sbin,
+			     enum sieve_compile_flags cpflags);
+
+int sieve_binary_check_executable(struct sieve_binary *sbin,
+				  enum sieve_error *error_r,
+				  const char **client_error_r);
+
+/*
+ * Block management
+ */
+
+enum sieve_binary_system_block {
+	SBIN_SYSBLOCK_SCRIPT_DATA,
+	SBIN_SYSBLOCK_EXTENSIONS,
+	SBIN_SYSBLOCK_MAIN_PROGRAM,
+	SBIN_SYSBLOCK_LAST
+};
+
+struct sieve_binary_block *sieve_binary_block_create(struct sieve_binary *sbin);
+
+unsigned int sieve_binary_block_count(struct sieve_binary *sbin);
+
+struct sieve_binary_block *
+sieve_binary_block_get(struct sieve_binary *sbin, unsigned int id);
+
+void sieve_binary_block_clear(struct sieve_binary_block *sblock);
+
+size_t sieve_binary_block_get_size(const struct sieve_binary_block *sblock);
+
+struct sieve_binary *
+sieve_binary_block_get_binary(const struct sieve_binary_block *sblock);
+
+unsigned int sieve_binary_block_get_id(const struct sieve_binary_block *sblock);
+
+/*
+ * Extension support
+ */
+
+struct sieve_binary_extension {
+	const struct sieve_extension_def *extension;
+
+	bool (*binary_pre_save)(const struct sieve_extension *ext,
+				struct sieve_binary *sbin, void *context,
+				enum sieve_error *error_r);
+	bool (*binary_post_save)(const struct sieve_extension *ext,
+				 struct sieve_binary *sbin, void *context,
+				 enum sieve_error *error_r);
+	bool (*binary_open)(const struct sieve_extension *ext,
+			    struct sieve_binary *sbin, void *context);
+
+	void (*binary_free)(const struct sieve_extension *ext,
+			    struct sieve_binary *sbin, void *context);
+
+	bool (*binary_up_to_date)(const struct sieve_extension *ext,
+				  struct sieve_binary *sbin, void *context,
+				  enum sieve_compile_flags cpflags);
+};
+
+void sieve_binary_extension_set_context(struct sieve_binary *sbin,
+					const struct sieve_extension *ext,
+					void *context);
+const void *
+sieve_binary_extension_get_context(struct sieve_binary *sbin,
+				   const struct sieve_extension *ext);
+
+void sieve_binary_extension_set(struct sieve_binary *sbin,
+				const struct sieve_extension *ext,
+				const struct sieve_binary_extension *bext,
+				void *context);
+
+struct sieve_binary_block *
+sieve_binary_extension_create_block(struct sieve_binary *sbin,
+				    const struct sieve_extension *ext);
+struct sieve_binary_block *
+sieve_binary_extension_get_block(struct sieve_binary *sbin,
+				 const struct sieve_extension *ext);
+
+int sieve_binary_extension_link(struct sieve_binary *sbin,
+				const struct sieve_extension *ext);
+const struct sieve_extension *
+sieve_binary_extension_get_by_index(struct sieve_binary *sbin, int index);
+int sieve_binary_extension_get_index(struct sieve_binary *sbin,
+				     const struct sieve_extension *ext);
+int sieve_binary_extensions_count(struct sieve_binary *sbin);
+
+/*
+ * Code emission
+ */
+
+/* Low-level emission functions */
+
+sieve_size_t sieve_binary_emit_data(struct sieve_binary_block *sblock,
+				    const void *data, sieve_size_t size);
+sieve_size_t sieve_binary_emit_byte(struct sieve_binary_block *sblock,
+				    uint8_t byte);
+void sieve_binary_update_data(struct sieve_binary_block *sblock,
+			      sieve_size_t address, const void *data,
+			      sieve_size_t size);
+
+/* Offset emission functions */
+
+sieve_size_t sieve_binary_emit_offset(struct sieve_binary_block *sblock,
+				      sieve_offset_t offset);
+void sieve_binary_resolve_offset(struct sieve_binary_block *sblock,
+				 sieve_size_t address);
+
+/* Literal emission functions */
+
+sieve_size_t sieve_binary_emit_integer(struct sieve_binary_block *sblock,
+				       sieve_number_t integer);
+sieve_size_t sieve_binary_emit_string(struct sieve_binary_block *sblock,
+				      const string_t *str);
+sieve_size_t sieve_binary_emit_cstring(struct sieve_binary_block *sblock,
+				       const char *str);
+
+static inline sieve_size_t
+sieve_binary_emit_unsigned(struct sieve_binary_block *sblock,
+			   unsigned int count)
+{
+	return sieve_binary_emit_integer(sblock, count);
+}
+
+/* Extension emission functions */
+
+sieve_size_t sieve_binary_emit_extension(struct sieve_binary_block *sblock,
+					 const struct sieve_extension *ext,
+					 unsigned int offset);
+void sieve_binary_emit_extension_object(
+	struct sieve_binary_block *sblock,
+	const struct sieve_extension_objects *objs, unsigned int code);
+
+/*
+ * Code retrieval
+ */
+
+/* Literals */
+
+bool sieve_binary_read_byte(struct sieve_binary_block *sblock,
+			    sieve_size_t *address, unsigned int *byte_r)
+			    ATTR_NULL(3);
+bool sieve_binary_read_code(struct sieve_binary_block *sblock,
+			    sieve_size_t *address, signed int *code_r)
+			    ATTR_NULL(3);
+bool sieve_binary_read_offset(struct sieve_binary_block *sblock,
+			      sieve_size_t *address, sieve_offset_t *offset_r)
+			      ATTR_NULL(3);
+bool sieve_binary_read_integer(struct sieve_binary_block *sblock,
+			       sieve_size_t *address, sieve_number_t *int_r)
+			       ATTR_NULL(3);
+bool sieve_binary_read_string(struct sieve_binary_block *sblock,
+			      sieve_size_t *address, string_t **str_r)
+			      ATTR_NULL(3);
+
+static inline bool ATTR_NULL(3)
+sieve_binary_read_unsigned(struct sieve_binary_block *sblock,
+			   sieve_size_t *address, unsigned int *count_r)
+{
+	sieve_number_t integer = 0;
+
+	if (!sieve_binary_read_integer(sblock, address, &integer))
+		return FALSE;
+	if (count_r != NULL)
+		*count_r = integer;
+	return TRUE;
+}
+
+/* Extensions */
+
+bool sieve_binary_read_extension(struct sieve_binary_block *sblock,
+				 sieve_size_t *address, unsigned int *offset_r,
+				 const struct sieve_extension **ext_r);
+const void *
+sieve_binary_read_extension_object(struct sieve_binary_block *sblock,
+				   sieve_size_t *address,
+				   const struct sieve_extension_objects *objs);
+
+/*
+ * Debug info
+ */
+
+/* Writer */
+
+struct sieve_binary_debug_writer;
+
+struct sieve_binary_debug_writer *
+sieve_binary_debug_writer_init(struct sieve_binary_block *sblock);
+void sieve_binary_debug_writer_deinit(
+	struct sieve_binary_debug_writer **dwriter);
+
+void sieve_binary_debug_emit(struct sieve_binary_debug_writer *dwriter,
+			     sieve_size_t code_address, unsigned int code_line,
+			     unsigned int code_column);
+
+/* Reader */
+
+struct sieve_binary_debug_reader *
+sieve_binary_debug_reader_init(struct sieve_binary_block *sblock);
+void sieve_binary_debug_reader_deinit(
+	struct sieve_binary_debug_reader **dreader);
+
+void sieve_binary_debug_reader_reset(struct sieve_binary_debug_reader *dreader);
+
+unsigned int
+sieve_binary_debug_read_line(struct sieve_binary_debug_reader *dreader,
+			     sieve_size_t code_address);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-code-dumper.c b/pigeonhole/src/lib-sieve/sieve-code-dumper.c
new file mode 100644
index 0000000..17e2768
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-code-dumper.c
@@ -0,0 +1,351 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include <stdio.h>
+#include <string.h>
+
+#include "lib.h"
+#include "str.h"
+#include "mempool.h"
+#include "ostream.h"
+
+#include "sieve-common.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-actions.h"
+#include "sieve-generator.h"
+#include "sieve-binary.h"
+#include "sieve-result.h"
+#include "sieve-comparators.h"
+
+#include "sieve-dump.h"
+
+/*
+ * Code dumper extension
+ */
+
+struct sieve_code_dumper_extension_reg {
+	const struct sieve_code_dumper_extension *cdmpext;
+	const struct sieve_extension *ext;
+	void *context;
+};
+
+struct sieve_code_dumper {
+	pool_t pool;
+
+	/* Dump status */
+	struct sieve_operation oprtn;
+	sieve_size_t mark_address;
+	unsigned int mark_line;
+	unsigned int mark_last_line;
+	unsigned int indent;
+
+	/* Dump environment */
+	struct sieve_dumptime_env *dumpenv;
+
+	struct sieve_binary_debug_reader *dreader;
+
+	ARRAY(struct sieve_code_dumper_extension_reg) extensions;
+};
+
+struct sieve_code_dumper *sieve_code_dumper_create
+(struct sieve_dumptime_env *denv)
+{
+	pool_t pool;
+	struct sieve_code_dumper *cdumper;
+
+	pool = pool_alloconly_create("sieve_code_dumper", 4096);
+	cdumper = p_new(pool, struct sieve_code_dumper, 1);
+	cdumper->pool = pool;
+	cdumper->dumpenv = denv;
+
+	/* Setup storage for extension contexts */
+	p_array_init(&cdumper->extensions, pool,
+		sieve_extensions_get_count(denv->svinst));
+
+	return cdumper;
+}
+
+void sieve_code_dumper_free(struct sieve_code_dumper **_cdumper)
+{
+	struct sieve_code_dumper *cdumper = *_cdumper;
+	const struct sieve_code_dumper_extension_reg *eregs;
+	unsigned int count, i;
+
+	sieve_binary_debug_reader_deinit(&cdumper->dreader);
+
+	/* Signal registered extensions that the dumper is being destroyed */
+	eregs = array_get(&cdumper->extensions, &count);
+	for ( i = 0; i < count; i++ ) {
+		if ( eregs[i].cdmpext != NULL && eregs[i].cdmpext->free != NULL )
+			eregs[i].cdmpext->free(cdumper, eregs[i].context);
+	}
+
+	pool_unref(&cdumper->pool);
+	*_cdumper = NULL;
+}
+
+pool_t sieve_code_dumper_pool(struct sieve_code_dumper *cdumper)
+{
+	return cdumper->pool;
+}
+
+/* EXtension support */
+
+void sieve_dump_extension_register
+(struct sieve_code_dumper *cdumper, const struct sieve_extension *ext,
+	const struct sieve_code_dumper_extension *cdmpext, void *context)
+{
+	struct sieve_code_dumper_extension_reg *reg;
+
+	if ( ext->id < 0 ) return;
+
+	reg = array_idx_get_space(&cdumper->extensions, (unsigned int) ext->id);
+	reg->cdmpext = cdmpext;
+	reg->ext = ext;
+	reg->context = context;
+}
+
+void sieve_dump_extension_set_context
+(struct sieve_code_dumper *cdumper, const struct sieve_extension *ext,
+	void *context)
+{
+	struct sieve_code_dumper_extension_reg *reg;
+
+	if ( ext->id < 0 ) return;
+
+	reg = array_idx_get_space(&cdumper->extensions, (unsigned int) ext->id);
+	reg->context = context;
+}
+
+void *sieve_dump_extension_get_context
+(struct sieve_code_dumper *cdumper, const struct sieve_extension *ext)
+{
+	const struct sieve_code_dumper_extension_reg *reg;
+
+	if  ( ext->id < 0 || ext->id >= (int) array_count(&cdumper->extensions) )
+		return NULL;
+
+	reg = array_idx(&cdumper->extensions, (unsigned int) ext->id);
+
+	return reg->context;
+}
+
+/* Dump functions */
+
+void sieve_code_dumpf
+(const struct sieve_dumptime_env *denv, const char *fmt, ...)
+{
+	struct sieve_code_dumper *cdumper = denv->cdumper;
+	unsigned tab = cdumper->indent;
+
+	string_t *outbuf = t_str_new(128);
+	va_list args;
+
+	va_start(args, fmt);
+	str_printfa(outbuf, "%08llx: ", (unsigned long long) cdumper->mark_address);
+
+	if ( cdumper->mark_line > 0 && (cdumper->indent == 0 ||
+		cdumper->mark_line != cdumper->mark_last_line) ) {
+		str_printfa(outbuf, "%4u: ", cdumper->mark_line);
+		cdumper->mark_last_line = cdumper->mark_line;
+	} else {
+		str_append(outbuf, "      ");
+	}
+
+	while ( tab > 0 )	{
+		str_append(outbuf, "  ");
+		tab--;
+	}
+
+	str_vprintfa(outbuf, fmt, args);
+	str_append_c(outbuf, '\n');
+	va_end(args);
+
+	o_stream_nsend(denv->stream, str_data(outbuf), str_len(outbuf));
+}
+
+static inline void sieve_code_line_mark
+(const struct sieve_dumptime_env *denv, sieve_size_t location)
+{
+	if ( denv->cdumper->dreader != NULL )  {
+		denv->cdumper->mark_line = sieve_binary_debug_read_line
+			(denv->cdumper->dreader, location);
+	}
+}
+
+void sieve_code_mark(const struct sieve_dumptime_env *denv)
+{
+	denv->cdumper->mark_address = denv->offset;
+	sieve_code_line_mark(denv, denv->offset);
+}
+
+void sieve_code_mark_specific
+(const struct sieve_dumptime_env *denv, sieve_size_t location)
+{
+	denv->cdumper->mark_address = location;
+	sieve_code_line_mark(denv, location);
+}
+
+void sieve_code_descend(const struct sieve_dumptime_env *denv)
+{
+	denv->cdumper->indent++;
+}
+
+void sieve_code_ascend(const struct sieve_dumptime_env *denv)
+{
+	if ( denv->cdumper->indent > 0 )
+		denv->cdumper->indent--;
+}
+
+/* Code Dump */
+
+static bool sieve_code_dumper_print_operation
+(struct sieve_code_dumper *cdumper)
+{
+	struct sieve_dumptime_env *denv = cdumper->dumpenv;
+	struct sieve_operation *oprtn = &(cdumper->oprtn);
+	sieve_size_t *address	= &(denv->offset);
+
+	/* Mark start address of operation */
+	cdumper->indent = 0;
+	cdumper->mark_address = *address;
+
+	sieve_code_line_mark(denv, *address);
+
+	/* Read operation */
+	if ( sieve_operation_read(denv->sblock, address, oprtn) ) {
+		const struct sieve_operation_def *opdef = oprtn->def;
+
+		if ( opdef->dump != NULL )
+			return opdef->dump(denv, address);
+		else if ( opdef->mnemonic != NULL )
+			sieve_code_dumpf(denv, "%s", opdef->mnemonic);
+		else
+			return FALSE;
+
+		return TRUE;
+	}
+
+	sieve_code_dumpf(denv, "Failed to read opcode.");
+	return FALSE;
+}
+
+static bool sieve_code_dumper_print_extension
+(struct sieve_code_dumper *cdumper)
+{
+	struct sieve_dumptime_env *denv = cdumper->dumpenv;
+	sieve_size_t *address	= &(denv->offset);
+	struct sieve_binary_block *sblock = denv->sblock;
+	unsigned int code = 0, deferred;
+	const struct sieve_extension *ext;
+
+	sieve_code_mark(denv);
+
+	if ( !sieve_binary_read_extension
+			(sblock, address, &code, &ext) ||
+		!sieve_binary_read_byte
+			(sblock, address, &deferred) ) {
+		return FALSE;
+	}
+
+	if ( ext->def == NULL) {
+		sieve_code_dumpf(denv, "[undefined]");
+
+	} else {
+		sieve_code_dumpf(denv, "%s%s",
+			sieve_extension_name(ext),
+			(deferred > 0 ? " (deferred)" : ""));
+
+		if (ext->def->code_dump != NULL ) {
+			sieve_code_descend(denv);
+			if ( !ext->def->code_dump(ext, denv, address) )
+				return FALSE;
+			sieve_code_ascend(denv);
+		}
+	}
+	return TRUE;
+}
+
+void sieve_code_dumper_run(struct sieve_code_dumper *cdumper)
+{
+	struct sieve_dumptime_env *denv = cdumper->dumpenv;
+	struct sieve_binary *sbin = denv->sbin;
+	struct sieve_binary_block *sblock = denv->sblock;
+	unsigned int debug_block_id, ext_count;
+	bool success;
+	sieve_size_t *address;
+
+	denv->offset = 0;
+	denv->oprtn = &(cdumper->oprtn);
+	address = &(denv->offset);
+
+	/* Heading */
+	o_stream_nsend_str(denv->stream, "Address   Line  Code\n");
+
+	/* Load debug block */
+	sieve_code_mark(denv);
+
+	if ( sieve_binary_read_unsigned(sblock, address, &debug_block_id) ) {
+		struct sieve_binary_block *debug_block =
+			sieve_binary_block_get(sbin, debug_block_id);
+
+		if ( debug_block == NULL ) {
+			sieve_code_dumpf(denv, "Invalid id %d for debug block.", debug_block_id);
+			return;
+		} else {
+			/* Initialize debug reader */
+			cdumper->dreader = sieve_binary_debug_reader_init(debug_block);
+
+			/* Dump block id */
+			sieve_code_dumpf(denv, "DEBUG BLOCK: %d", debug_block_id);
+		}
+	} else {
+		sieve_code_dumpf(denv, "Binary code header is corrupt.");
+		return;
+	}
+
+	/* Load and dump extensions listed in code */
+	sieve_code_mark(denv);
+
+	success = TRUE;
+	if ( sieve_binary_read_unsigned(sblock, address, &ext_count) ) {
+		unsigned int i;
+
+		sieve_code_dumpf(denv, "EXTENSIONS [%d]:", ext_count);
+		sieve_code_descend(denv);
+
+		for ( i = 0; success && (i < ext_count); i++ ) {
+			T_BEGIN {
+				success = success &&
+					sieve_code_dumper_print_extension(cdumper);
+			} T_END;
+		}
+
+		sieve_code_ascend(denv);
+	}	else
+		success = FALSE;
+
+	if ( !success ) {
+		sieve_code_dumpf(denv, "Binary code header is corrupt.");
+		return;
+	}
+
+	while ( *address < sieve_binary_block_get_size(sblock) ) {
+
+		T_BEGIN {
+			success = sieve_code_dumper_print_operation(cdumper);
+		} T_END;
+
+		if ( !success ) {
+			sieve_code_dumpf(denv, "Binary is corrupt.");
+			return;
+		}
+	}
+
+	/* Mark end of the binary */
+	cdumper->indent = 0;
+	cdumper->mark_address = sieve_binary_block_get_size(sblock);
+	sieve_code_dumpf(denv, "[End of code]");
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-code-dumper.h b/pigeonhole/src/lib-sieve/sieve-code-dumper.h
new file mode 100644
index 0000000..651bd11
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-code-dumper.h
@@ -0,0 +1,55 @@
+#ifndef SIEVE_CODE_DUMPER_H
+#define SIEVE_CODE_DUMPER_H
+
+#include "sieve-common.h"
+
+struct sieve_code_dumper;
+
+struct sieve_code_dumper *sieve_code_dumper_create
+	(struct sieve_dumptime_env *denv);
+void sieve_code_dumper_free
+	(struct sieve_code_dumper **_dumper);
+pool_t sieve_code_dumper_pool
+	(struct sieve_code_dumper *dumper);
+
+/*
+ * Extension support
+ */
+
+struct sieve_code_dumper_extension {
+	const struct sieve_extension_def *ext;
+
+	void (*free)(struct sieve_code_dumper *dumper, void *context);
+};
+
+void sieve_dump_extension_register
+(struct sieve_code_dumper *dumper, const struct sieve_extension *ext,
+	const struct sieve_code_dumper_extension *dump_ext, void *context);
+void sieve_dump_extension_set_context
+	(struct sieve_code_dumper *dumper, const struct sieve_extension *ext,
+		void *context);
+void *sieve_dump_extension_get_context
+	(struct sieve_code_dumper *dumper, const struct sieve_extension *ext);
+
+/* Dump functions */
+
+void sieve_code_dumpf
+	(const struct sieve_dumptime_env *denv, const char *fmt, ...)
+		ATTR_FORMAT(2, 3);
+
+void sieve_code_mark(const struct sieve_dumptime_env *denv);
+void sieve_code_mark_specific
+	(const struct sieve_dumptime_env *denv, sieve_size_t location);
+void sieve_code_descend(const struct sieve_dumptime_env *denv);
+void sieve_code_ascend(const struct sieve_dumptime_env *denv);
+
+/* Operations and operands */
+
+bool sieve_code_dumper_print_optional_operands
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+
+/* Code dump (debugging purposes) */
+
+void sieve_code_dumper_run(struct sieve_code_dumper *dumper);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-code.c b/pigeonhole/src/lib-sieve/sieve-code.c
new file mode 100644
index 0000000..82bd7f1
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-code.c
@@ -0,0 +1,1169 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "str-sanitize.h"
+
+#include "sieve-common.h"
+#include "sieve-limits.h"
+#include "sieve-extensions.h"
+#include "sieve-stringlist.h"
+#include "sieve-actions.h"
+#include "sieve-binary.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "sieve-code.h"
+
+#include <stdio.h>
+
+/*
+ * Code stringlist
+ */
+
+/* Forward declarations */
+
+static int sieve_code_stringlist_next_item
+	(struct sieve_stringlist *_strlist, string_t **str_r);
+static void sieve_code_stringlist_reset
+	(struct sieve_stringlist *_strlist);
+static int sieve_code_stringlist_get_length
+	(struct sieve_stringlist *_strlist);
+
+/* Coded stringlist object */
+
+struct sieve_code_stringlist {
+	struct sieve_stringlist strlist;
+
+	sieve_size_t start_address;
+	sieve_size_t end_address;
+	sieve_size_t current_offset;
+	int length;
+	int index;
+};
+
+static struct sieve_stringlist *sieve_code_stringlist_create
+(const struct sieve_runtime_env *renv,
+	 sieve_size_t start_address, unsigned int length, sieve_size_t end)
+{
+	struct sieve_code_stringlist *strlist;
+
+	if ( end > sieve_binary_block_get_size(renv->sblock) )
+  		return NULL;
+
+	strlist = t_new(struct sieve_code_stringlist, 1);
+	strlist->strlist.runenv = renv;
+	strlist->strlist.exec_status = SIEVE_EXEC_OK;
+	strlist->strlist.next_item = sieve_code_stringlist_next_item;
+	strlist->strlist.reset = sieve_code_stringlist_reset;
+	strlist->strlist.get_length = sieve_code_stringlist_get_length;
+	strlist->start_address = start_address;
+	strlist->current_offset = start_address;
+	strlist->end_address = end;
+	strlist->length = length;
+	strlist->index = 0;
+
+	return &strlist->strlist;
+}
+
+/* Stringlist implementation */
+
+static int sieve_code_stringlist_next_item
+(struct sieve_stringlist *_strlist, string_t **str_r)
+{
+	struct sieve_code_stringlist *strlist =
+		(struct sieve_code_stringlist *) _strlist;
+	sieve_size_t address;
+	*str_r = NULL;
+	int ret;
+
+	/* Check for end of list */
+	if ( strlist->index >= strlist->length )
+		return 0;
+
+	/* Read next item */
+	address = strlist->current_offset;
+	if ( (ret=sieve_opr_string_read(_strlist->runenv, &address, NULL, str_r))
+		== SIEVE_EXEC_OK ) {
+		strlist->index++;
+		strlist->current_offset = address;
+		return 1;
+	}
+
+	_strlist->exec_status = ret;
+	return -1;
+}
+
+static void sieve_code_stringlist_reset
+(struct sieve_stringlist *_strlist)
+{
+	struct sieve_code_stringlist *strlist =
+		(struct sieve_code_stringlist *) _strlist;
+
+	strlist->current_offset = strlist->start_address;
+	strlist->index = 0;
+}
+
+static int sieve_code_stringlist_get_length
+(struct sieve_stringlist *_strlist)
+{
+	struct sieve_code_stringlist *strlist =
+		(struct sieve_code_stringlist *) _strlist;
+
+	return strlist->length;
+}
+
+static bool sieve_code_stringlist_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address,
+	unsigned int length, sieve_size_t end, const char *field_name)
+{
+	unsigned int i;
+
+	if ( end > sieve_binary_block_get_size(denv->sblock) )
+  		return FALSE;
+
+	if ( field_name != NULL )
+		sieve_code_dumpf(denv, "%s: STRLIST [%u] (end: %08llx)",
+			field_name, length, (unsigned long long) end);
+	else
+		sieve_code_dumpf(denv, "STRLIST [%u] (end: %08llx)",
+			length, (unsigned long long) end);
+
+	sieve_code_descend(denv);
+
+	for ( i = 0; i < length; i++ ) {
+		bool success = TRUE;
+
+		T_BEGIN {
+			success = sieve_opr_string_dump(denv, address, NULL);
+		} T_END;
+
+		if ( !success || *address > end )
+			return FALSE;
+	}
+
+	if ( *address != end ) return FALSE;
+
+	sieve_code_ascend(denv);
+
+	return TRUE;
+}
+
+/*
+ * Core operands
+ */
+
+extern const struct sieve_operand_def comparator_operand;
+extern const struct sieve_operand_def match_type_operand;
+extern const struct sieve_operand_def address_part_operand;
+
+const struct sieve_operand_def *sieve_operands[] = {
+	&omitted_operand, /* SIEVE_OPERAND_OPTIONAL */
+	&number_operand,
+	&string_operand,
+	&stringlist_operand,
+	&comparator_operand,
+	&match_type_operand,
+	&address_part_operand,
+	&catenated_string_operand
+};
+
+const unsigned int sieve_operand_count =
+	N_ELEMENTS(sieve_operands);
+
+/*
+ * Operand functions
+ */
+
+sieve_size_t sieve_operand_emit
+(struct sieve_binary_block *sblock, const struct sieve_extension *ext,
+	const struct sieve_operand_def *opr_def)
+{
+	sieve_size_t address;
+
+	if ( ext != NULL ) {
+		address = sieve_binary_emit_extension
+			(sblock, ext, sieve_operand_count);
+
+		sieve_binary_emit_extension_object
+			(sblock, &opr_def->ext_def->operands, opr_def->code);
+
+		return address;
+	}
+
+	return sieve_binary_emit_byte(sblock, opr_def->code);
+}
+
+bool sieve_operand_read
+(struct sieve_binary_block *sblock, sieve_size_t *address,
+	const char *field_name, struct sieve_operand *operand)
+{
+	unsigned int code = sieve_operand_count;
+
+	operand->address = *address;
+	operand->field_name = field_name;
+	operand->ext = NULL;
+	operand->def = NULL;
+
+	if ( !sieve_binary_read_extension(sblock, address, &code, &operand->ext) )
+		return FALSE;
+
+	if ( operand->ext == NULL ) {
+		if ( code < sieve_operand_count )
+			operand->def = sieve_operands[code];
+
+		return ( operand->def != NULL );
+	}
+
+	if ( operand->ext->def == NULL )
+		return FALSE;
+
+	operand->def = (const struct sieve_operand_def *)
+		sieve_binary_read_extension_object(sblock, address,
+			&operand->ext->def->operands);
+
+	return ( operand->def != NULL );
+}
+
+/*
+ * Optional operand
+ */
+
+int sieve_opr_optional_next
+(struct sieve_binary_block *sblock, sieve_size_t *address, signed int *opt_code)
+{
+	/* Start of optional operand block */
+	if ( *opt_code == 0 ) {
+		sieve_size_t tmp_addr = *address;
+		unsigned int op;
+
+		if ( !sieve_binary_read_byte(sblock, &tmp_addr, &op) ||
+			op != SIEVE_OPERAND_OPTIONAL )
+			return 0;
+
+		*address = tmp_addr;
+	}
+
+	/* Read optional operand code */
+	if ( !sieve_binary_read_code(sblock, address, opt_code) )
+		return -1;
+
+	/* Return 0 at end of list */
+	return ( *opt_code != 0 ? 1 : 0 );
+}
+
+/*
+ * Operand definitions
+ */
+
+/* Omitted */
+
+const struct sieve_operand_class omitted_class =
+	{ "OMITTED" };
+
+const struct sieve_operand_def omitted_operand = {
+	.name = "@OMITTED",
+	.code = SIEVE_OPERAND_OPTIONAL,
+	.class = &omitted_class
+};
+
+/* Number */
+
+static bool opr_number_dump
+	(const struct sieve_dumptime_env *denv,	const struct sieve_operand *oprnd,
+		sieve_size_t *address);
+static int opr_number_read
+	(const struct sieve_runtime_env *renv, const struct sieve_operand *oprnd,
+		sieve_size_t *address, sieve_number_t *number_r);
+
+const struct sieve_opr_number_interface number_interface = {
+	opr_number_dump,
+	opr_number_read
+};
+
+const struct sieve_operand_class number_class =
+	{ "number" };
+
+const struct sieve_operand_def number_operand = {
+	.name = "@number",
+	.code = SIEVE_OPERAND_NUMBER,
+	.class = &number_class,
+	.interface = &number_interface
+};
+
+/* String */
+
+static bool opr_string_dump
+	(const struct sieve_dumptime_env *denv, const struct sieve_operand *oprnd,
+		sieve_size_t *address);
+static int opr_string_read
+	(const struct sieve_runtime_env *renv, const struct sieve_operand *oprnd,
+		sieve_size_t *address, string_t **str_r);
+
+const struct sieve_opr_string_interface string_interface ={
+	opr_string_dump,
+	opr_string_read
+};
+
+const struct sieve_operand_class string_class =
+	{ "string" };
+
+const struct sieve_operand_def string_operand = {
+	.name = "@string",
+	.code = SIEVE_OPERAND_STRING,
+	.class = &string_class,
+	.interface = &string_interface
+};
+
+/* String List */
+
+static bool opr_stringlist_dump
+	(const struct sieve_dumptime_env *denv, const struct sieve_operand *oprnd,
+		sieve_size_t *address);
+static int opr_stringlist_read
+	(const struct sieve_runtime_env *renv, const struct sieve_operand *oprnd,
+		sieve_size_t *address, struct sieve_stringlist **strlist_r);
+
+const struct sieve_opr_stringlist_interface stringlist_interface = {
+	opr_stringlist_dump,
+	opr_stringlist_read
+};
+
+const struct sieve_operand_class stringlist_class =
+	{ "string-list" };
+
+const struct sieve_operand_def stringlist_operand =	{
+	.name = "@string-list",
+	.code = SIEVE_OPERAND_STRING_LIST,
+	.class = &stringlist_class,
+	.interface = &stringlist_interface
+};
+
+/* Catenated String */
+
+static bool opr_catenated_string_dump
+	(const struct sieve_dumptime_env *denv, const struct sieve_operand *operand,
+		sieve_size_t *address);
+static int opr_catenated_string_read
+	(const struct sieve_runtime_env *renv, const struct sieve_operand *operand,
+		sieve_size_t *address, string_t **str);
+
+const struct sieve_opr_string_interface catenated_string_interface = {
+	opr_catenated_string_dump,
+	opr_catenated_string_read
+};
+
+const struct sieve_operand_def catenated_string_operand = {
+	.name = "@catenated-string",
+	.code = SIEVE_OPERAND_CATENATED_STRING,
+	.class = &string_class,
+	.interface = &catenated_string_interface
+};
+
+/*
+ * Operand implementations
+ */
+
+/* Omitted */
+
+void sieve_opr_omitted_emit(struct sieve_binary_block *sblock)
+{
+	(void) sieve_operand_emit(sblock, NULL, &omitted_operand);
+}
+
+/* Number */
+
+void sieve_opr_number_emit
+(struct sieve_binary_block *sblock, sieve_number_t number)
+{
+	(void) sieve_operand_emit(sblock, NULL, &number_operand);
+	(void) sieve_binary_emit_integer(sblock, number);
+}
+
+bool sieve_opr_number_dump_data
+(const struct sieve_dumptime_env *denv, struct sieve_operand *oprnd,
+	sieve_size_t *address, const char *field_name)
+{
+	const struct sieve_opr_number_interface *intf;
+
+	oprnd->field_name = field_name;
+
+	if ( !sieve_operand_is_number(oprnd) )
+		return FALSE;
+
+	intf = (const struct sieve_opr_number_interface *) oprnd->def->interface;
+
+	if ( intf->dump == NULL )
+		return FALSE;
+
+	return intf->dump(denv, oprnd, address);
+}
+
+bool sieve_opr_number_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address,
+	const char *field_name)
+{
+	struct sieve_operand operand;
+
+	sieve_code_mark(denv);
+
+	if ( !sieve_operand_read(denv->sblock, address, field_name, &operand) )
+		return FALSE;
+
+	return sieve_opr_number_dump_data(denv, &operand, address, field_name);
+}
+
+int sieve_opr_number_read_data
+(const struct sieve_runtime_env *renv, struct sieve_operand *oprnd,
+	sieve_size_t *address, const char *field_name, sieve_number_t *number_r)
+{
+	const struct sieve_opr_number_interface *intf;
+
+	oprnd->field_name = field_name;
+
+	if ( !sieve_operand_is_number(oprnd) ) {
+		sieve_runtime_trace_operand_error(renv, oprnd,
+			"expected number operand but found %s", sieve_operand_name(oprnd));
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	intf = (const struct sieve_opr_number_interface *) oprnd->def->interface;
+
+	if ( intf->read == NULL ) {
+		sieve_runtime_trace_operand_error(renv, oprnd,
+			"number operand not implemented");
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	return intf->read(renv, oprnd, address, number_r);
+}
+
+int sieve_opr_number_read
+(const struct sieve_runtime_env *renv, sieve_size_t *address,
+	const char *field_name, sieve_number_t *number_r)
+{
+	struct sieve_operand operand;
+	int ret;
+
+	if ( (ret=sieve_operand_runtime_read(renv, address, field_name, &operand))
+		<= 0)
+		return ret;
+
+	return sieve_opr_number_read_data
+		(renv, &operand, address, field_name, number_r);
+}
+
+static bool opr_number_dump
+(const struct sieve_dumptime_env *denv,	const struct sieve_operand *oprnd,
+	sieve_size_t *address)
+{
+	sieve_number_t number = 0;
+
+	if (sieve_binary_read_integer(denv->sblock, address, &number) ) {
+		if ( oprnd->field_name != NULL )
+			sieve_code_dumpf(denv, "%s: NUM %llu", oprnd->field_name,
+				(unsigned long long) number);
+		else
+			sieve_code_dumpf(denv, "NUM %llu", (unsigned long long) number);
+
+		return TRUE;
+	}
+
+	return FALSE;
+}
+
+static int opr_number_read
+(const struct sieve_runtime_env *renv, const struct sieve_operand *oprnd,
+	sieve_size_t *address, sieve_number_t *number_r)
+{
+	if ( !sieve_binary_read_integer(renv->sblock, address, number_r) ) {
+		sieve_runtime_trace_operand_error(renv, oprnd, "invalid number operand");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	return SIEVE_EXEC_OK;
+}
+
+/* String */
+
+void sieve_opr_string_emit(struct sieve_binary_block *sblock, string_t *str)
+{
+	(void) sieve_operand_emit(sblock, NULL, &string_operand);
+	(void) sieve_binary_emit_string(sblock, str);
+}
+
+bool sieve_opr_string_dump_data
+(const struct sieve_dumptime_env *denv, struct sieve_operand *oprnd,
+	sieve_size_t *address, const char *field_name)
+{
+	const struct sieve_opr_string_interface *intf;
+
+	oprnd->field_name = field_name;
+
+	if ( !sieve_operand_is_string(oprnd) ) {
+		sieve_code_dumpf(denv, "ERROR: INVALID STRING OPERAND %s",
+			sieve_operand_name(oprnd));
+		return FALSE;
+	}
+
+	intf = (const struct sieve_opr_string_interface *) oprnd->def->interface;
+
+	if ( intf->dump == NULL ) {
+		sieve_code_dumpf(denv, "ERROR: DUMP STRING OPERAND");
+		return FALSE;
+	}
+
+	return intf->dump(denv, oprnd, address);
+}
+
+bool sieve_opr_string_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address,
+	const char *field_name)
+{
+	struct sieve_operand operand;
+
+	sieve_code_mark(denv);
+
+	if ( !sieve_operand_read(denv->sblock, address, field_name, &operand) ) {
+		sieve_code_dumpf(denv, "ERROR: INVALID OPERAND");
+		return FALSE;
+	}
+
+	return sieve_opr_string_dump_data(denv, &operand, address, field_name);
+}
+
+bool sieve_opr_string_dump_ex
+(const struct sieve_dumptime_env *denv, sieve_size_t *address,
+	const char *field_name, const char *omitted_value)
+{
+	struct sieve_operand operand;
+
+	sieve_code_mark(denv);
+	if ( !sieve_operand_read(denv->sblock, address, field_name, &operand) ) {
+		sieve_code_dumpf(denv, "ERROR: INVALID OPERAND");
+		return FALSE;
+	}
+
+	if ( omitted_value != NULL && sieve_operand_is_omitted(&operand) ) {
+		if ( *omitted_value != '\0' )
+			sieve_code_dumpf(denv, "%s: %s", field_name, omitted_value);
+		return TRUE;
+	}
+
+	return sieve_opr_string_dump_data(denv, &operand, address, field_name);
+}
+
+int sieve_opr_string_read_data
+(const struct sieve_runtime_env *renv, struct sieve_operand *oprnd,
+	sieve_size_t *address, const char *field_name, string_t **str_r)
+{
+	const struct sieve_opr_string_interface *intf;
+
+	oprnd->field_name = field_name;
+
+	if ( !sieve_operand_is_string(oprnd) ) {
+		sieve_runtime_trace_operand_error(renv, oprnd,
+			"expected string operand but found %s", sieve_operand_name(oprnd));
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	intf = (const struct sieve_opr_string_interface *) oprnd->def->interface;
+
+	if ( intf->read == NULL ) {
+		sieve_runtime_trace_operand_error(renv, oprnd,
+			"string operand not implemented");
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	return intf->read(renv, oprnd, address, str_r);
+}
+
+int sieve_opr_string_read
+(const struct sieve_runtime_env *renv, sieve_size_t *address,
+	const char *field_name, string_t **str_r)
+{
+	struct sieve_operand operand;
+	int ret;
+
+	if ( (ret=sieve_operand_runtime_read(renv, address, field_name, &operand))
+		<= 0 )
+		return ret;
+
+	return sieve_opr_string_read_data(renv, &operand, address, field_name, str_r);
+}
+
+int sieve_opr_string_read_ex
+(const struct sieve_runtime_env *renv, sieve_size_t *address,
+	const char *field_name, bool optional, string_t **str_r, bool *literal_r)
+{
+	struct sieve_operand operand;
+	int ret;
+
+	if ( (ret=sieve_operand_runtime_read(renv, address, field_name, &operand))
+		<= 0 )
+		return ret;
+
+	if ( optional && sieve_operand_is_omitted(&operand) ) {
+		*str_r = NULL;
+		return 1;
+	}
+
+	if ( literal_r != NULL )
+		*literal_r = sieve_operand_is_string_literal(&operand);
+
+	return sieve_opr_string_read_data(renv, &operand, address, field_name, str_r);
+}
+
+static void _dump_string
+(const struct sieve_dumptime_env *denv, string_t *str,
+	const char *field_name)
+{
+	if ( str_len(str) > 80 ) {
+		if ( field_name != NULL )
+			sieve_code_dumpf(denv, "%s: STR[%ld] \"%s",
+				field_name, (long) str_len(str), str_sanitize(str_c(str), 80));
+		else
+			sieve_code_dumpf(denv, "STR[%ld] \"%s",
+				(long) str_len(str), str_sanitize(str_c(str), 80));
+	} else {
+		if ( field_name != NULL )
+			sieve_code_dumpf(denv, "%s: STR[%ld] \"%s\"",
+				field_name, (long) str_len(str), str_sanitize(str_c(str), 80));
+		else
+			sieve_code_dumpf(denv, "STR[%ld] \"%s\"",
+				(long) str_len(str), str_sanitize(str_c(str), 80));
+	}
+}
+
+bool opr_string_dump
+(const struct sieve_dumptime_env *denv, const struct sieve_operand *oprnd,
+	sieve_size_t *address)
+{
+	string_t *str;
+
+	if ( sieve_binary_read_string(denv->sblock, address, &str) ) {
+		_dump_string(denv, str, oprnd->field_name);
+
+		return TRUE;
+	}
+
+	return FALSE;
+}
+
+static int opr_string_read
+(const struct sieve_runtime_env *renv, 	const struct sieve_operand *oprnd,
+	sieve_size_t *address, string_t **str_r)
+{
+	if ( !sieve_binary_read_string(renv->sblock, address, str_r) ) {
+		sieve_runtime_trace_operand_error(renv, oprnd,
+			"invalid string operand");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	return SIEVE_EXEC_OK;
+}
+
+/* String list */
+
+void sieve_opr_stringlist_emit_start
+(struct sieve_binary_block *sblock, unsigned int listlen, void **context)
+{
+	sieve_size_t *end_offset = t_new(sieve_size_t, 1);
+
+	/* Emit byte identifying the type of operand */
+	(void) sieve_operand_emit(sblock, NULL, &stringlist_operand);
+
+	/* Give the interpreter an easy way to skip over this string list */
+	*end_offset = sieve_binary_emit_offset(sblock, 0);
+	*context = (void *) end_offset;
+
+	/* Emit the length of the list */
+	(void) sieve_binary_emit_unsigned(sblock, listlen);
+}
+
+void sieve_opr_stringlist_emit_item
+(struct sieve_binary_block *sblock, void *context ATTR_UNUSED, string_t *item)
+{
+	(void) sieve_opr_string_emit(sblock, item);
+}
+
+void sieve_opr_stringlist_emit_end
+(struct sieve_binary_block *sblock, void *context)
+{
+	sieve_size_t *end_offset = (sieve_size_t *) context;
+
+	(void) sieve_binary_resolve_offset(sblock, *end_offset);
+}
+
+bool sieve_opr_stringlist_dump_data
+(const struct sieve_dumptime_env *denv, struct sieve_operand *oprnd,
+	sieve_size_t *address, const char *field_name)
+{
+	if ( oprnd == NULL || oprnd->def == NULL )
+		return FALSE;
+
+	oprnd->field_name = field_name;
+
+	if ( oprnd->def->class == &stringlist_class ) {
+		const struct sieve_opr_stringlist_interface *intf =
+			(const struct sieve_opr_stringlist_interface *) oprnd->def->interface;
+
+		if ( intf->dump == NULL )
+			return FALSE;
+
+		return intf->dump(denv, oprnd, address);
+	} else if ( oprnd->def->class == &string_class ) {
+		const struct sieve_opr_string_interface *intf =
+			(const struct sieve_opr_string_interface *) oprnd->def->interface;
+
+		if ( intf->dump == NULL )
+			return FALSE;
+
+		return intf->dump(denv, oprnd, address);
+	}
+
+	return FALSE;
+}
+
+bool sieve_opr_stringlist_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address,
+	const char *field_name)
+{
+	struct sieve_operand operand;
+
+	sieve_code_mark(denv);
+
+	if ( !sieve_operand_read(denv->sblock, address, field_name, &operand) ) {
+		return FALSE;
+	}
+
+	return sieve_opr_stringlist_dump_data(denv, &operand, address, field_name);
+}
+
+bool sieve_opr_stringlist_dump_ex
+(const struct sieve_dumptime_env *denv, sieve_size_t *address,
+	const char *field_name, const char *omitted_value)
+{
+	struct sieve_operand operand;
+
+	sieve_code_mark(denv);
+
+	if ( !sieve_operand_read(denv->sblock, address, field_name, &operand) ) {
+		return FALSE;
+	}
+
+	if ( omitted_value != NULL && sieve_operand_is_omitted(&operand) ) {
+		if ( *omitted_value != '\0' )
+			sieve_code_dumpf(denv, "%s: %s", field_name, omitted_value);
+		return TRUE;
+	}
+
+	return sieve_opr_stringlist_dump_data(denv, &operand, address, field_name);
+}
+
+int sieve_opr_stringlist_read_data
+(const struct sieve_runtime_env *renv, struct sieve_operand *oprnd,
+	sieve_size_t *address, const char *field_name,
+	struct sieve_stringlist **strlist_r)
+{
+	if ( oprnd == NULL || oprnd->def == NULL )
+		return SIEVE_EXEC_FAILURE;
+
+	oprnd->field_name = field_name;
+
+	if ( oprnd->def->class == &stringlist_class ) {
+		const struct sieve_opr_stringlist_interface *intf =
+			(const struct sieve_opr_stringlist_interface *) oprnd->def->interface;
+		int ret;
+
+		if ( intf->read == NULL ) {
+			sieve_runtime_trace_operand_error(renv, oprnd,
+				"stringlist operand not implemented");
+			return SIEVE_EXEC_FAILURE;
+		}
+
+		if ( (ret=intf->read(renv, oprnd, address, strlist_r)) <= 0 )
+			return ret;
+
+		return SIEVE_EXEC_OK;
+	} else if ( oprnd->def->class == &string_class ) {
+		/* Special case, accept single string as string list as well. */
+		const struct sieve_opr_string_interface *intf =
+			(const struct sieve_opr_string_interface *) oprnd->def->interface;
+		int ret;
+
+		if ( intf->read == NULL ) {
+			sieve_runtime_trace_operand_error(renv, oprnd,
+				"stringlist string operand not implemented");
+			return SIEVE_EXEC_FAILURE;
+		}
+
+		if ( strlist_r == NULL ) {
+			if ( (ret=intf->read(renv, oprnd, address, NULL)) <= 0 )
+				return ret;
+		} else {
+			string_t *stritem;
+			if ( (ret=intf->read(renv, oprnd, address, &stritem)) <= 0 )
+				return ret;
+
+			*strlist_r = sieve_single_stringlist_create
+				(renv, stritem, FALSE);
+		}
+		return SIEVE_EXEC_OK;
+	}
+
+	sieve_runtime_trace_operand_error(renv, oprnd,
+		"expected stringlist or string operand but found %s",
+		sieve_operand_name(oprnd));
+	return SIEVE_EXEC_BIN_CORRUPT;
+}
+
+int sieve_opr_stringlist_read
+(const struct sieve_runtime_env *renv, sieve_size_t *address,
+	const char *field_name, struct sieve_stringlist **strlist_r)
+{
+	struct sieve_operand operand;
+	int ret;
+
+	if ( (ret=sieve_operand_runtime_read(renv, address, field_name, &operand))
+		<= 0 )
+		return ret;
+
+	return sieve_opr_stringlist_read_data
+		(renv, &operand, address, field_name, strlist_r);
+}
+
+int sieve_opr_stringlist_read_ex
+(const struct sieve_runtime_env *renv, sieve_size_t *address,
+	const char *field_name, bool optional, struct sieve_stringlist **strlist_r)
+{
+	struct sieve_operand operand;
+	int ret;
+
+	if ( (ret=sieve_operand_runtime_read(renv, address, field_name, &operand))
+		<= 0 )
+		return ret;
+
+	if ( optional && sieve_operand_is_omitted(&operand) ) {
+		*strlist_r = NULL;
+		return 1;
+	}
+
+	return sieve_opr_stringlist_read_data
+		(renv, &operand, address, field_name, strlist_r);
+}
+
+static bool opr_stringlist_dump
+(const struct sieve_dumptime_env *denv, const struct sieve_operand *oprnd,
+	sieve_size_t *address)
+{
+	sieve_size_t pc = *address;
+	sieve_size_t end;
+	unsigned int length = 0;
+ 	sieve_offset_t end_offset;
+
+	if ( !sieve_binary_read_offset(denv->sblock, address, &end_offset) )
+		return FALSE;
+
+	end = pc + end_offset;
+
+	if ( !sieve_binary_read_unsigned(denv->sblock, address, &length) )
+		return FALSE;
+
+	return sieve_code_stringlist_dump
+		(denv, address, length, end, oprnd->field_name);
+}
+
+static int opr_stringlist_read
+(const struct sieve_runtime_env *renv, const struct sieve_operand *oprnd,
+	sieve_size_t *address, struct sieve_stringlist **strlist_r)
+{
+	sieve_size_t pc = *address;
+	sieve_size_t end;
+	unsigned int length = 0;
+	sieve_offset_t end_offset;
+
+	if ( !sieve_binary_read_offset(renv->sblock, address, &end_offset) ) {
+		sieve_runtime_trace_operand_error(renv, oprnd,
+			"stringlist corrupt: invalid end offset");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	end = pc + end_offset;
+
+	if ( !sieve_binary_read_unsigned(renv->sblock, address, &length) ) {
+		sieve_runtime_trace_operand_error(renv, oprnd,
+			"stringlist corrupt: invalid length data");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	if ( strlist_r != NULL )
+		*strlist_r = sieve_code_stringlist_create
+			(renv, *address, (unsigned int) length, end);
+
+	/* Skip over the string list for now */
+	*address = end;
+
+	return SIEVE_EXEC_OK;
+}
+
+/* Catenated String */
+
+void sieve_opr_catenated_string_emit
+(struct sieve_binary_block *sblock, unsigned int elements)
+{
+	(void) sieve_operand_emit(sblock, NULL, &catenated_string_operand);
+	(void) sieve_binary_emit_unsigned(sblock, elements);
+}
+
+static bool opr_catenated_string_dump
+(const struct sieve_dumptime_env *denv, const struct sieve_operand *oprnd,
+	sieve_size_t *address)
+{
+	unsigned int elements = 0;
+	unsigned int i;
+
+	if ( !sieve_binary_read_unsigned(denv->sblock, address, &elements) )
+		return FALSE;
+
+	if ( oprnd->field_name != NULL )
+		sieve_code_dumpf(denv, "%s: CAT-STR [%ld]:",
+			oprnd->field_name, (long) elements);
+	else
+		sieve_code_dumpf(denv, "CAT-STR [%ld]:", (long) elements);
+
+	sieve_code_descend(denv);
+	for ( i = 0; i < (unsigned int) elements; i++ ) {
+		if ( !sieve_opr_string_dump(denv, address, NULL) )
+			return FALSE;
+	}
+	sieve_code_ascend(denv);
+
+	return TRUE;
+}
+
+static int opr_catenated_string_read
+(const struct sieve_runtime_env *renv, const struct sieve_operand *oprnd,
+	sieve_size_t *address, string_t **str)
+{
+	unsigned int elements = 0;
+	unsigned int i;
+	int ret;
+
+	if ( !sieve_binary_read_unsigned(renv->sblock, address, &elements) ) {
+		sieve_runtime_trace_operand_error(renv, oprnd,
+			"catenated string corrupt: invalid element count data");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	/* Parameter str can be NULL if we are requested to only skip and not
+	 * actually read the argument.
+	 */
+	if ( str == NULL ) {
+		for ( i = 0; i < (unsigned int) elements; i++ ) {
+			if ( (ret=sieve_opr_string_read(renv, address, NULL, NULL)) <= 0 )
+				return ret;
+		}
+	} else {
+		string_t *strelm;
+		string_t **elm = &strelm;
+
+		*str = t_str_new(128);
+		for ( i = 0; i < (unsigned int) elements; i++ ) {
+
+			if ( (ret=sieve_opr_string_read(renv, address, NULL, elm)) <= 0 )
+				return ret;
+
+			if ( elm != NULL ) {
+				str_append_str(*str, strelm);
+
+				if ( str_len(*str) > SIEVE_MAX_STRING_LEN ) {
+					str_truncate(*str, SIEVE_MAX_STRING_LEN);
+					elm = NULL;
+				}
+			}
+		}
+	}
+
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Core operations
+ */
+
+/* Forward declarations */
+
+static bool opc_jmp_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+
+static int opc_jmp_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+static int opc_jmptrue_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+static int opc_jmpfalse_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+/* Operation objects defined in this file */
+
+const struct sieve_operation_def sieve_jmp_operation = {
+	.mnemonic = "JMP",
+	.code = SIEVE_OPERATION_JMP,
+	.dump = opc_jmp_dump,
+	.execute = opc_jmp_execute
+};
+
+const struct sieve_operation_def sieve_jmptrue_operation = {
+	.mnemonic = "JMPTRUE",
+	.code = SIEVE_OPERATION_JMPTRUE,
+	.dump = opc_jmp_dump,
+	.execute = opc_jmptrue_execute
+};
+
+const struct sieve_operation_def sieve_jmpfalse_operation = {
+	.mnemonic = "JMPFALSE",
+	.code = SIEVE_OPERATION_JMPFALSE,
+	.dump = opc_jmp_dump,
+	.execute = opc_jmpfalse_execute
+};
+
+/* Operation objects defined in other files */
+
+extern const struct sieve_operation_def cmd_stop_operation;
+extern const struct sieve_operation_def cmd_keep_operation;
+extern const struct sieve_operation_def cmd_discard_operation;
+extern const struct sieve_operation_def cmd_redirect_operation;
+
+extern const struct sieve_operation_def tst_address_operation;
+extern const struct sieve_operation_def tst_header_operation;
+extern const struct sieve_operation_def tst_exists_operation;
+extern const struct sieve_operation_def tst_size_over_operation;
+extern const struct sieve_operation_def tst_size_under_operation;
+
+const struct sieve_operation_def *sieve_operations[] = {
+	NULL,
+
+	&sieve_jmp_operation,
+	&sieve_jmptrue_operation,
+	&sieve_jmpfalse_operation,
+
+	&cmd_stop_operation,
+	&cmd_keep_operation,
+	&cmd_discard_operation,
+	&cmd_redirect_operation,
+
+	&tst_address_operation,
+	&tst_header_operation,
+	&tst_exists_operation,
+	&tst_size_over_operation,
+	&tst_size_under_operation
+};
+
+const unsigned int sieve_operation_count =
+	N_ELEMENTS(sieve_operations);
+
+/*
+ * Operation functions
+ */
+
+sieve_size_t sieve_operation_emit
+(struct sieve_binary_block *sblock, const struct sieve_extension *ext,
+	const struct sieve_operation_def *op_def)
+{
+	sieve_size_t address;
+
+  if ( ext != NULL ) {
+		i_assert( op_def->ext_def != NULL );
+		address = sieve_binary_emit_extension
+			(sblock, ext, sieve_operation_count);
+
+		sieve_binary_emit_extension_object
+			(sblock, &op_def->ext_def->operations, op_def->code);
+		return address;
+  }
+
+	i_assert( op_def->ext_def == NULL );
+  return sieve_binary_emit_byte(sblock, op_def->code);
+}
+
+bool sieve_operation_read
+(struct sieve_binary_block *sblock, sieve_size_t *address,
+	struct sieve_operation *oprtn)
+{
+	unsigned int code = sieve_operation_count;
+
+	oprtn->address = *address;
+	oprtn->def = NULL;
+	oprtn->ext = NULL;
+
+	if ( !sieve_binary_read_extension(sblock, address, &code, &oprtn->ext) )
+		return FALSE;
+
+	if ( oprtn->ext == NULL ) {
+		if ( code < sieve_operation_count ) {
+			oprtn->def = sieve_operations[code];
+		}
+
+		return ( oprtn->def != NULL );
+	}
+
+	oprtn->def = (const struct sieve_operation_def *)
+		sieve_binary_read_extension_object(sblock, address,
+			&oprtn->ext->def->operations);
+
+	return ( oprtn->def != NULL );
+}
+
+/*
+ * Jump operations
+ */
+
+/* Code dump */
+
+static bool opc_jmp_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	const struct sieve_operation *oprtn = denv->oprtn;
+	unsigned int pc = *address;
+	sieve_offset_t offset;
+
+	if ( sieve_binary_read_offset(denv->sblock, address, &offset) )
+		sieve_code_dumpf(denv, "%s %d [%08x]",
+			sieve_operation_mnemonic(oprtn), offset, pc + offset);
+	else
+		return FALSE;
+
+	return TRUE;
+}
+
+/* Code execution */
+
+static int opc_jmp_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address ATTR_UNUSED)
+{
+	return sieve_interpreter_program_jump(renv->interp, TRUE, FALSE);
+}
+
+static int opc_jmptrue_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address ATTR_UNUSED)
+{
+	bool result = sieve_interpreter_get_test_result(renv->interp);
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS, "jump if result is true");
+	sieve_runtime_trace_descend(renv);
+
+	return sieve_interpreter_program_jump(renv->interp, result, FALSE);
+}
+
+static int opc_jmpfalse_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address ATTR_UNUSED)
+{
+	bool result = sieve_interpreter_get_test_result(renv->interp);
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS, "jump if result is false");
+	sieve_runtime_trace_descend(renv);
+
+	return sieve_interpreter_program_jump(renv->interp, !result, FALSE);
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-code.h b/pigeonhole/src/lib-sieve/sieve-code.h
new file mode 100644
index 0000000..00bf68b
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-code.h
@@ -0,0 +1,351 @@
+#ifndef SIEVE_CODE_H
+#define SIEVE_CODE_H
+
+#include "lib.h"
+#include "buffer.h"
+#include "mempool.h"
+#include "array.h"
+
+#include "sieve-common.h"
+#include "sieve-runtime.h"
+#include "sieve-runtime-trace.h"
+#include "sieve-dump.h"
+
+/*
+ * Operand object
+ */
+
+struct sieve_operand_class {
+	const char *name;
+};
+
+struct sieve_operand_def {
+	const char *name;
+
+	const struct sieve_extension_def *ext_def;
+	unsigned int code;
+
+	const struct sieve_operand_class *class;
+	const void *interface;
+};
+
+struct sieve_operand {
+	const struct sieve_operand_def *def;
+	const struct sieve_extension *ext;
+	sieve_size_t address;
+	const char *field_name;
+};
+
+#define sieve_operand_name(opr) \
+	( (opr)->def == NULL ? "(NULL)" : (opr)->def->name )
+#define sieve_operand_is(opr, definition) \
+	( (opr)->def == &(definition) )
+
+sieve_size_t sieve_operand_emit
+	(struct sieve_binary_block *sblock, const struct sieve_extension *ext,
+		const struct sieve_operand_def *oprnd);
+bool sieve_operand_read
+	(struct sieve_binary_block *sblock, sieve_size_t *address,
+		const char *field_name, struct sieve_operand *oprnd);
+
+static inline int sieve_operand_runtime_read
+(const struct sieve_runtime_env *renv, sieve_size_t *address,
+	const char *field_name, struct sieve_operand *operand)
+{
+	if ( !sieve_operand_read(renv->sblock, address, field_name, operand) ) {
+		sieve_runtime_trace_operand_error(renv, operand, "invalid operand");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Optional operands
+ */
+
+int sieve_opr_optional_next
+(struct sieve_binary_block *sblock, sieve_size_t *address,
+	signed int *opt_code);
+
+static inline int sieve_opr_optional_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address,
+	signed int *opt_code)
+{
+	sieve_size_t pc = *address;
+	int ret;
+
+	if ( (ret=sieve_opr_optional_next(denv->sblock, address, opt_code)) <= 0 )
+		return ret;
+
+	sieve_code_mark_specific(denv, pc);
+	return ret;
+}
+
+static inline int sieve_opr_optional_read
+(const struct sieve_runtime_env *renv, sieve_size_t *address,
+	signed int *opt_code)
+{
+	int ret;
+
+	if ( (ret=sieve_opr_optional_next(renv->sblock, address, opt_code)) < 0 )
+		sieve_runtime_trace_error(renv, "invalid optional operand code");
+
+	return ret;
+}
+
+/*
+ * Core operands
+ */
+
+/* Operand codes */
+
+enum sieve_core_operand {
+	SIEVE_OPERAND_OPTIONAL = 0x00,
+	SIEVE_OPERAND_NUMBER,
+	SIEVE_OPERAND_STRING,
+	SIEVE_OPERAND_STRING_LIST,
+	SIEVE_OPERAND_COMPARATOR,
+	SIEVE_OPERAND_MATCH_TYPE,
+	SIEVE_OPERAND_ADDRESS_PART,
+	SIEVE_OPERAND_CATENATED_STRING,
+
+	SIEVE_OPERAND_CUSTOM
+};
+
+/* Operand classes */
+
+extern const struct sieve_operand_class number_class;
+extern const struct sieve_operand_class string_class;
+extern const struct sieve_operand_class stringlist_class;
+
+/* Operand objects */
+
+extern const struct sieve_operand_def omitted_operand;
+extern const struct sieve_operand_def number_operand;
+extern const struct sieve_operand_def string_operand;
+extern const struct sieve_operand_def stringlist_operand;
+extern const struct sieve_operand_def catenated_string_operand;
+
+extern const struct sieve_operand_def *sieve_operands[];
+extern const unsigned int sieve_operand_count;
+
+/* Operand object interfaces */
+
+struct sieve_opr_number_interface {
+	bool (*dump)
+		(const struct sieve_dumptime_env *denv, const struct sieve_operand *oprnd,
+			sieve_size_t *address);
+	int (*read)
+	  (const struct sieve_runtime_env *renv, const struct sieve_operand *oprnd,
+			sieve_size_t *address, sieve_number_t *number_r);
+};
+
+struct sieve_opr_string_interface {
+	bool (*dump)
+		(const struct sieve_dumptime_env *denv, const struct sieve_operand *oprnd,
+			sieve_size_t *address);
+	int (*read)
+		(const struct sieve_runtime_env *renv, const struct sieve_operand *oprnd,
+		 	sieve_size_t *address, string_t **str_r);
+};
+
+struct sieve_opr_stringlist_interface {
+	bool (*dump)
+		(const struct sieve_dumptime_env *denv, const struct sieve_operand *oprnd,
+			sieve_size_t *address);
+	int (*read)
+		(const struct sieve_runtime_env *renv, const struct sieve_operand *oprnd,
+			sieve_size_t *address, struct sieve_stringlist **strlist_r);
+};
+
+/*
+ * Core operand functions
+ */
+
+/* Omitted */
+
+void sieve_opr_omitted_emit(struct sieve_binary_block *sblock);
+
+static inline bool sieve_operand_is_omitted
+(const struct sieve_operand *operand)
+{
+	return ( operand != NULL && operand->def != NULL &&
+		operand->def == &omitted_operand );
+}
+
+/* Number */
+
+void sieve_opr_number_emit
+	(struct sieve_binary_block *sblock, sieve_number_t number);
+bool sieve_opr_number_dump_data
+	(const struct sieve_dumptime_env *denv, struct sieve_operand *operand,
+		sieve_size_t *address, const char *field_name);
+bool sieve_opr_number_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address,
+		const char *field_name);
+int sieve_opr_number_read_data
+	(const struct sieve_runtime_env *renv, struct sieve_operand *operand,
+		sieve_size_t *address, const char *field_name, sieve_number_t *number_r);
+int sieve_opr_number_read
+	(const struct sieve_runtime_env *renv, sieve_size_t *address,
+		const char *field_name, sieve_number_t *number_r);
+
+static inline bool sieve_operand_is_number
+(const struct sieve_operand *operand)
+{
+	return ( operand != NULL && operand->def != NULL &&
+		operand->def->class == &number_class );
+}
+
+/* String */
+
+void sieve_opr_string_emit
+	(struct sieve_binary_block *sblock, string_t *str);
+bool sieve_opr_string_dump_data
+	(const struct sieve_dumptime_env *denv, struct sieve_operand *operand,
+		sieve_size_t *address, const char *field_name);
+bool sieve_opr_string_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address,
+		const char *field_name);
+bool sieve_opr_string_dump_ex
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address,
+		const char *field_name, const char *omitted_value);
+int sieve_opr_string_read_data
+	(const struct sieve_runtime_env *renv, struct sieve_operand *operand,
+		sieve_size_t *address, const char *field_name, string_t **str_r);
+int sieve_opr_string_read
+	(const struct sieve_runtime_env *renv, sieve_size_t *address,
+		const char *field_name, string_t **str_r);
+int sieve_opr_string_read_ex
+	(const struct sieve_runtime_env *renv, sieve_size_t *address,
+		const char *field_name, bool optional, string_t **str_r, bool *literal_r);
+
+static inline bool sieve_operand_is_string
+(const struct sieve_operand *operand)
+{
+	return ( operand != NULL && operand->def != NULL &&
+		operand->def->class == &string_class );
+}
+
+static inline bool sieve_operand_is_string_literal
+(const struct sieve_operand *operand)
+{
+	return ( operand != NULL && sieve_operand_is(operand, string_operand) );
+}
+
+/* String list */
+
+void sieve_opr_stringlist_emit_start
+	(struct sieve_binary_block *sblock, unsigned int listlen, void **context);
+void sieve_opr_stringlist_emit_item
+	(struct sieve_binary_block *sblock, void *context ATTR_UNUSED,
+		string_t *item);
+void sieve_opr_stringlist_emit_end
+	(struct sieve_binary_block *sblock, void *context);
+bool sieve_opr_stringlist_dump_data
+	(const struct sieve_dumptime_env *denv, struct sieve_operand *operand,
+		sieve_size_t *address, const char *field_name);
+bool sieve_opr_stringlist_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address,
+		const char *field_name);
+bool sieve_opr_stringlist_dump_ex
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address,
+		const char *field_name, const char *omitted_value);
+int sieve_opr_stringlist_read_data
+	(const struct sieve_runtime_env *renv, struct sieve_operand *operand,
+		sieve_size_t *address, const char *field_name,
+		struct sieve_stringlist **strlist_r);
+int sieve_opr_stringlist_read
+	(const struct sieve_runtime_env *renv, sieve_size_t *address,
+		const char *field_name, struct sieve_stringlist **strlist_r);
+int sieve_opr_stringlist_read_ex
+	(const struct sieve_runtime_env *renv, sieve_size_t *address,
+		const char *field_name, bool optional, struct sieve_stringlist **strlist_r);
+
+static inline bool sieve_operand_is_stringlist
+(const struct sieve_operand *operand)
+{
+	return ( operand != NULL && operand->def != NULL &&
+		(operand->def->class == &stringlist_class ||
+			operand->def->class == &string_class) );
+}
+
+/* Catenated string */
+
+void sieve_opr_catenated_string_emit
+	(struct sieve_binary_block *sblock, unsigned int elements);
+
+/*
+ * Operation object
+ */
+
+struct sieve_operation_def {
+	const char *mnemonic;
+
+	const struct sieve_extension_def *ext_def;
+	unsigned int code;
+
+	bool (*dump)
+		(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+	int (*execute)
+		(const struct sieve_runtime_env *renv, sieve_size_t *address);
+};
+
+struct sieve_operation {
+	const struct sieve_operation_def *def;
+	const struct sieve_extension *ext;
+
+	sieve_size_t address;
+};
+
+#define sieve_operation_is(oprtn, definition) \
+	( (oprtn)->def == &(definition) )
+#define sieve_operation_mnemonic(oprtn) \
+	( (oprtn)->def == NULL ? "(NULL)" : (oprtn)->def->mnemonic )
+
+sieve_size_t sieve_operation_emit
+	(struct sieve_binary_block *sblock, const struct sieve_extension *ext,
+		const struct sieve_operation_def *op_def);
+bool sieve_operation_read
+	(struct sieve_binary_block *sblock, sieve_size_t *address,
+		struct sieve_operation *oprtn);
+const char *sieve_operation_read_string
+	(struct sieve_binary_block *sblock, sieve_size_t *address);
+
+/*
+ * Core operations
+ */
+
+/* Opcodes */
+
+enum sieve_operation_code {
+	SIEVE_OPERATION_INVALID,
+	SIEVE_OPERATION_JMP,
+	SIEVE_OPERATION_JMPTRUE,
+	SIEVE_OPERATION_JMPFALSE,
+
+	SIEVE_OPERATION_STOP,
+	SIEVE_OPERATION_KEEP,
+	SIEVE_OPERATION_DISCARD,
+	SIEVE_OPERATION_REDIRECT,
+
+	SIEVE_OPERATION_ADDRESS,
+	SIEVE_OPERATION_HEADER,
+	SIEVE_OPERATION_EXISTS,
+	SIEVE_OPERATION_SIZE_OVER,
+	SIEVE_OPERATION_SIZE_UNDER,
+
+	SIEVE_OPERATION_CUSTOM
+};
+
+/* Operation objects */
+
+extern const struct sieve_operation_def sieve_jmp_operation;
+extern const struct sieve_operation_def sieve_jmptrue_operation;
+extern const struct sieve_operation_def sieve_jmpfalse_operation;
+
+extern const struct sieve_operation_def *sieve_operations[];
+extern const unsigned int sieve_operations_count;
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-commands.c b/pigeonhole/src/lib-sieve/sieve-commands.c
new file mode 100644
index 0000000..324b66d
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-commands.c
@@ -0,0 +1,403 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "str-sanitize.h"
+
+#include "rfc2822.h"
+
+#include "sieve-common.h"
+#include "sieve-ast.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-binary.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-interpreter.h"
+
+/*
+ * Literal arguments
+ */
+
+/* Forward declarations */
+
+static bool arg_number_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+		struct sieve_command *context);
+static bool arg_string_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+		struct sieve_command *context);
+static bool arg_string_list_validate
+	(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *context);
+static bool arg_string_list_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+		struct sieve_command *context);
+
+/* Argument objects */
+
+const struct sieve_argument_def number_argument = {
+	.identifier = "@number",
+	.generate = arg_number_generate
+};
+
+const struct sieve_argument_def string_argument = {
+	.identifier = "@string",
+	.generate = arg_string_generate
+};
+
+const struct sieve_argument_def string_list_argument = {
+	.identifier = "@string-list",
+	.validate = arg_string_list_validate,
+	.generate = arg_string_list_generate
+};
+
+/* Argument implementations */
+
+static bool arg_number_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+	struct sieve_command *cmd ATTR_UNUSED)
+{
+	sieve_opr_number_emit(cgenv->sblock, sieve_ast_argument_number(arg));
+
+	return TRUE;
+}
+
+static bool arg_string_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+	struct sieve_command *cmd ATTR_UNUSED)
+{
+	sieve_opr_string_emit(cgenv->sblock, sieve_ast_argument_str(arg));
+
+	return TRUE;
+}
+
+static bool arg_string_list_validate
+(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+	struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *stritem;
+
+	stritem = sieve_ast_strlist_first(*arg);
+	while ( stritem != NULL ) {
+		if ( !sieve_validator_argument_activate(valdtr, cmd, stritem, FALSE) )
+			return FALSE;
+
+		stritem = sieve_ast_strlist_next(stritem);
+	}
+
+	return TRUE;
+}
+
+static bool emit_string_list_operand
+(const struct sieve_codegen_env *cgenv, const struct sieve_ast_argument *strlist,
+	struct sieve_command *cmd)
+{
+	void *list_context;
+	struct sieve_ast_argument *stritem;
+
+	sieve_opr_stringlist_emit_start
+		(cgenv->sblock, sieve_ast_strlist_count(strlist), &list_context);
+
+	stritem = sieve_ast_strlist_first(strlist);
+	while ( stritem != NULL ) {
+		if ( !sieve_generate_argument(cgenv, stritem, cmd) )
+			return FALSE;
+
+		stritem = sieve_ast_strlist_next(stritem);
+	}
+
+	sieve_opr_stringlist_emit_end(cgenv->sblock, list_context);
+
+	return TRUE;
+}
+
+static bool arg_string_list_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+	struct sieve_command *cmd)
+{
+	if ( sieve_ast_argument_type(arg) == SAAT_STRING ) {
+		return ( sieve_generate_argument(cgenv, arg, cmd) );
+
+	} else if ( sieve_ast_argument_type(arg) == SAAT_STRING_LIST ) {
+		bool result = TRUE;
+
+		if ( sieve_ast_strlist_count(arg) == 1 )
+			return ( sieve_generate_argument
+				(cgenv, sieve_ast_strlist_first(arg), cmd) );
+		else {
+			T_BEGIN {
+				result=emit_string_list_operand(cgenv, arg, cmd);
+			} T_END;
+		}
+
+		return result;
+	}
+
+	return FALSE;
+}
+
+/*
+ * Abstract arguments
+ *
+ *   (Generated by processing and not by parsing the grammar)
+ */
+
+/* Catenated string */
+
+struct sieve_arg_catenated_string {
+	struct sieve_ast_arg_list *str_parts;
+};
+
+struct sieve_arg_catenated_string *sieve_arg_catenated_string_create
+(struct sieve_ast_argument *orig_arg)
+{
+	pool_t pool = sieve_ast_pool(orig_arg->ast);
+	struct sieve_ast_arg_list *arglist;
+	struct sieve_arg_catenated_string *catstr;
+
+	arglist = sieve_ast_arg_list_create(pool);
+
+	catstr = p_new(pool, struct sieve_arg_catenated_string, 1);
+	catstr->str_parts = arglist;
+	(orig_arg)->argument->data = (void *) catstr;
+
+	return catstr;
+}
+
+void sieve_arg_catenated_string_add_element
+(struct sieve_arg_catenated_string *catstr,
+	struct sieve_ast_argument *element)
+{
+	sieve_ast_arg_list_add(catstr->str_parts, element);
+}
+
+#define _cat_string_first(catstr) __AST_LIST_FIRST((catstr)->str_parts)
+#define _cat_string_count(catstr) __AST_LIST_COUNT((catstr)->str_parts)
+#define _cat_string_next(item) __AST_LIST_NEXT(item)
+
+bool sieve_arg_catenated_string_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+	struct sieve_command *cmd)
+{
+	struct sieve_arg_catenated_string *catstr =
+		(struct sieve_arg_catenated_string *) arg->argument->data;
+	struct sieve_ast_argument *strpart;
+
+	if ( _cat_string_count(catstr) == 1 )
+		sieve_generate_argument(cgenv, _cat_string_first(catstr), cmd);
+	else {
+		sieve_opr_catenated_string_emit(cgenv->sblock, _cat_string_count(catstr));
+
+		strpart = _cat_string_first(catstr);
+		while ( strpart != NULL ) {
+			if ( !sieve_generate_argument(cgenv, strpart, cmd) )
+				return FALSE;
+
+			strpart = _cat_string_next(strpart);
+		}
+	}
+
+	return TRUE;
+}
+
+/*
+ * Argument creation
+ */
+
+struct sieve_argument *sieve_argument_create
+(struct sieve_ast *ast, const struct sieve_argument_def *def,
+	const struct sieve_extension *ext, int id_code)
+{
+	struct sieve_argument *arg;
+	pool_t pool;
+
+	pool = sieve_ast_pool(ast);
+	arg = p_new(pool, struct sieve_argument, 1);
+	arg->def = def;
+	arg->ext = ext;
+	arg->id_code = id_code;
+
+	return arg;
+}
+
+/*
+ * Core tests and commands
+ */
+
+const struct sieve_command_def *sieve_core_tests[] = {
+	&tst_false, &tst_true,
+	&tst_not, &tst_anyof, &tst_allof,
+	&tst_address, &tst_header, &tst_exists, &tst_size
+};
+
+const unsigned int sieve_core_tests_count = N_ELEMENTS(sieve_core_tests);
+
+const struct sieve_command_def *sieve_core_commands[] = {
+	&cmd_require,
+	&cmd_stop, &cmd_if, &cmd_elsif, &cmd_else,
+	&cmd_keep, &cmd_discard, &cmd_redirect
+};
+
+const unsigned int sieve_core_commands_count = N_ELEMENTS(sieve_core_commands);
+
+/*
+ * Command context
+ */
+
+struct sieve_command *sieve_command_prev
+(struct sieve_command *cmd)
+{
+	struct sieve_ast_node *node = sieve_ast_node_prev(cmd->ast_node);
+
+	if ( node != NULL ) {
+		return node->command;
+	}
+
+	return NULL;
+}
+
+struct sieve_command *sieve_command_parent
+(struct sieve_command *cmd)
+{
+	struct sieve_ast_node *node = sieve_ast_node_parent(cmd->ast_node);
+
+	return ( node != NULL ? node->command : NULL );
+}
+
+struct sieve_command *sieve_command_create
+(struct sieve_ast_node *cmd_node, const struct sieve_extension *ext,
+	const struct sieve_command_def *cmd_def,
+	struct sieve_command_registration *cmd_reg)
+{
+	struct sieve_command *cmd;
+
+	cmd = p_new(sieve_ast_node_pool(cmd_node), struct sieve_command, 1);
+
+	cmd->ast_node = cmd_node;
+	cmd->def = cmd_def;
+	cmd->ext = ext;
+	cmd->reg = cmd_reg;
+
+	cmd->block_exit_command = NULL;
+
+	return cmd;
+}
+
+const char *sieve_command_def_type_name
+(const struct sieve_command_def *cmd_def)
+{
+	switch ( cmd_def->type ) {
+	case SCT_NONE: return "command of unspecified type (bug)";
+	case SCT_TEST: return "test";
+	case SCT_COMMAND: return "command";
+	case SCT_HYBRID: return "command or test";
+	default:
+		break;
+	}
+	return "??COMMAND-TYPE??";
+}
+
+const char *sieve_command_type_name
+	(const struct sieve_command *cmd)
+{
+	switch ( cmd->def->type ) {
+	case SCT_NONE: return "command of unspecified type (bug)";
+	case SCT_TEST: return "test";
+	case SCT_COMMAND: return "command";
+	case SCT_HYBRID:
+		if ( cmd->ast_node->type == SAT_TEST )
+			return "test";
+		return "command";
+	default:
+		break;
+	}
+	return "??COMMAND-TYPE??";
+}
+
+struct sieve_ast_argument *sieve_command_add_dynamic_tag
+(struct sieve_command *cmd, const struct sieve_extension *ext,
+	const struct sieve_argument_def *tag, int id_code)
+{
+	struct sieve_ast_argument *arg;
+
+	if ( cmd->first_positional != NULL )
+		arg = sieve_ast_argument_tag_insert
+			(cmd->first_positional, tag->identifier, cmd->ast_node->source_line);
+	else
+		arg = sieve_ast_argument_tag_create
+			(cmd->ast_node, tag->identifier, cmd->ast_node->source_line);
+
+	arg->argument = sieve_argument_create(cmd->ast_node->ast, tag, ext, id_code);
+
+	return arg;
+}
+
+struct sieve_ast_argument *sieve_command_find_argument
+(struct sieve_command *cmd, const struct sieve_argument_def *arg_def)
+{
+	struct sieve_ast_argument *arg = sieve_ast_argument_first(cmd->ast_node);
+
+	/* Visit tagged and optional arguments */
+	while ( arg != NULL ) {
+		if ( arg->argument != NULL && arg->argument->def == arg_def )
+			return arg;
+
+		arg = sieve_ast_argument_next(arg);
+	}
+
+	return arg;
+}
+
+/* Use this function with caution. The command commits to exiting the block.
+ * When it for some reason does not, the interpretation will break later on,
+ * because exiting jumps are not generated when they would otherwise be
+ * necessary.
+ */
+void sieve_command_exit_block_unconditionally
+	(struct sieve_command *cmd)
+{
+	struct sieve_command *parent = sieve_command_parent(cmd);
+
+	/* Only the first unconditional exit is of importance */
+	if ( parent != NULL && parent->block_exit_command == NULL )
+		parent->block_exit_command = cmd;
+}
+
+bool sieve_command_block_exits_unconditionally
+	(struct sieve_command *cmd)
+{
+	return ( cmd->block_exit_command != NULL );
+}
+
+/*
+ * Command utility functions
+ */
+
+/* NOTE: this may be moved */
+
+static int _verify_header_name_item
+(void *context, struct sieve_ast_argument *header)
+{
+	struct sieve_validator *valdtr = (struct sieve_validator *) context;
+	string_t *name = sieve_ast_argument_str(header);
+
+	if ( sieve_argument_is_string_literal(header) &&
+		!rfc2822_header_field_name_verify(str_c(name), str_len(name)) ) {
+		sieve_argument_validate_warning
+			(valdtr, header, "specified header field name '%s' is invalid",
+				str_sanitize(str_c(name), 80));
+
+		return 0;
+	}
+
+	return 1;
+}
+
+bool sieve_command_verify_headers_argument
+(struct sieve_validator *valdtr, struct sieve_ast_argument *headers)
+{
+	return ( sieve_ast_stringlist_map
+		(&headers, (void *) valdtr, _verify_header_name_item) >= 0 );
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-commands.h b/pigeonhole/src/lib-sieve/sieve-commands.h
new file mode 100644
index 0000000..f9b83e3
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-commands.h
@@ -0,0 +1,286 @@
+#ifndef SIEVE_COMMANDS_H
+#define SIEVE_COMMANDS_H
+
+#include "lib.h"
+
+#include "sieve-common.h"
+#include "sieve-ast.h"
+
+/*
+ * Argument definition
+ */
+
+enum sieve_argument_flag {
+	/* More than one of this (type of) tagged argument is allowed */
+	SIEVE_ARGUMENT_FLAG_MULTIPLE = (1 << 0)
+};
+
+struct sieve_argument_def {
+	const char *identifier;
+	enum sieve_argument_flag flags;
+
+	bool (*is_instance_of)
+		(struct sieve_validator *valdtr, struct sieve_command *cmd,
+			const struct sieve_extension *ext, const char *identifier, void **data);
+
+	bool (*validate)
+		(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+			struct sieve_command *cmd);
+	bool (*validate_context)
+		(struct sieve_validator *valdtr, struct sieve_ast_argument *arg,
+			struct sieve_command *cmd);
+	bool (*validate_persistent)
+		(struct sieve_validator *valdtr, struct sieve_command *cmd,
+			const struct sieve_extension *ext);
+
+	bool (*generate)
+		(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+			struct sieve_command *cmd);
+};
+
+/*
+ * Argument instance
+ */
+
+struct sieve_argument {
+	const struct sieve_argument_def *def;
+	const struct sieve_extension *ext;
+	int id_code;
+
+	/* Context data */
+	void *data;
+};
+
+#define sieve_argument_is(ast_arg, definition) \
+	( (ast_arg)->argument->def == &(definition) )
+#define sieve_argument_ext(ast_arg) \
+	( (ast_arg)->argument->ext )
+#define sieve_argument_identifier(ast_arg) \
+	( (ast_arg)->argument->def->identifier )
+
+/* Utility macros */
+
+#define sieve_argument_is_string_literal(arg) \
+	( (arg)->argument->def == &string_argument )
+
+/* Error handling */
+
+#define sieve_argument_validate_error(validator, arg_node, ...) \
+	sieve_validator_error(validator, \
+		((arg_node) == NULL ? 0 : (arg_node)->source_line), \
+		__VA_ARGS__)
+#define sieve_argument_validate_warning(validator, arg_node, ...) \
+	sieve_validator_warning(validator, \
+		((arg_node) == NULL ? 0 : (arg_node)->source_line), \
+		__VA_ARGS__)
+
+#define sieve_argument_generate_error(gentr, arg_node, ...) \
+	sieve_generator_error(gentr, \
+		((arg_node) == NULL ? 0 : (arg_node)->source_line), \
+		__VA_ARGS__)
+#define sieve_argument_generate_warning(gentr, arg_node, ...) \
+	sieve_generator_warning(gentr, \
+		((arg_node) == NULL ? 0 : (arg_node)->source_line), \
+		__VA_ARGS__)
+
+/* Argument API */
+
+struct sieve_argument *sieve_argument_create
+	(struct sieve_ast *ast, const struct sieve_argument_def *def,
+		const struct sieve_extension *ext, int id_code);
+
+/* Literal arguments */
+
+extern const struct sieve_argument_def number_argument;
+extern const struct sieve_argument_def string_argument;
+extern const struct sieve_argument_def string_list_argument;
+
+/* Catenated string argument */
+
+bool sieve_arg_catenated_string_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+		struct sieve_command *context);
+
+struct sieve_arg_catenated_string;
+
+struct sieve_arg_catenated_string *sieve_arg_catenated_string_create
+	(struct sieve_ast_argument *orig_arg);
+void sieve_arg_catenated_string_add_element
+	(struct sieve_arg_catenated_string *strdata,
+		struct sieve_ast_argument *element);
+
+/*
+ * Command definition
+ */
+
+enum sieve_command_type {
+	SCT_NONE,
+	SCT_COMMAND,
+	SCT_TEST,
+	SCT_HYBRID
+};
+
+struct sieve_command_def {
+	const char *identifier;
+	enum sieve_command_type type;
+
+	/* High-level command syntax */
+	int positional_args;
+	int subtests;
+	bool block_allowed;
+	bool block_required;
+
+	bool (*registered)
+		(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+			struct sieve_command_registration *cmd_reg);
+	bool (*pre_validate)
+		(struct sieve_validator *valdtr, struct sieve_command *cmd);
+	bool (*validate)
+		(struct sieve_validator *valdtr, struct sieve_command *cmd);
+	bool (*validate_const)
+		(struct sieve_validator *valdtr, struct sieve_command *cmd,
+			int *const_current, int const_next);
+	bool (*generate)
+		(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd);
+	bool (*control_generate)
+		(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd,
+		struct sieve_jumplist *jumps, bool jump_true);
+};
+
+/*
+ * Command instance
+ */
+
+struct sieve_command {
+	const struct sieve_command_def *def;
+	const struct sieve_extension *ext;
+
+	/* The registration of this command in the validator (sieve-validator.h) */
+	struct sieve_command_registration *reg;
+
+	/* The ast node of this command */
+	struct sieve_ast_node *ast_node;
+
+	/* First positional argument, found during argument validation */
+	struct sieve_ast_argument *first_positional;
+
+	/* The child ast node that unconditionally exits this command's block */
+	struct sieve_command *block_exit_command;
+
+	/* Context data*/
+	void *data;
+};
+
+#define sieve_command_is(cmd, definition) \
+	( (cmd)->def == &(definition) )
+#define sieve_command_identifier(cmd) \
+	( (cmd)->def->identifier )
+
+#define sieve_commands_equal(cmd1, cmd2) \
+	( (cmd1) != NULL && (cmd2) != NULL && (cmd1)->def == (cmd2)->def )
+
+/* Context API */
+
+struct sieve_command *sieve_command_create
+	(struct sieve_ast_node *cmd_node, const struct sieve_extension *ext,
+		const struct sieve_command_def *cmd_def,
+		struct sieve_command_registration *cmd_reg);
+
+const char *sieve_command_def_type_name
+	(const struct sieve_command_def *cmd_def);
+const char *sieve_command_type_name
+	(const struct sieve_command *cmd);
+
+struct sieve_command *sieve_command_prev
+	(struct sieve_command *cmd);
+struct sieve_command *sieve_command_parent
+	(struct sieve_command *cmd);
+
+struct sieve_ast_argument *sieve_command_add_dynamic_tag
+	(struct sieve_command *cmd, const struct sieve_extension *ext,
+		const struct sieve_argument_def *tag, int id_code);
+struct sieve_ast_argument *sieve_command_find_argument
+	(struct sieve_command *cmd, const struct sieve_argument_def *argument);
+
+void sieve_command_exit_block_unconditionally
+	(struct sieve_command *cmd);
+bool sieve_command_block_exits_unconditionally
+	(struct sieve_command *cmd);
+
+/* Error handling */
+
+#define sieve_command_validate_error(validator, context, ...) \
+	sieve_validator_error(validator, \
+		((context) == NULL ? 0 : (context)->ast_node->source_line), \
+		__VA_ARGS__)
+#define sieve_command_validate_warning(validator, context, ...) \
+	sieve_validator_warning(validator, \
+		((context) == NULL ? 0 : (context)->ast_node->source_line), \
+		__VA_ARGS__)
+
+#define sieve_command_generate_error(gentr, context, ...) \
+	sieve_generator_error(gentr, \
+		((context) == NULL ? 0 : (context)->ast_node->source_line), \
+		__VA_ARGS__)
+#define sieve_command_generate_warning(gentr, context, ...) \
+	sieve_generator_warning(gentr, \
+		((context) == NULL ? 0 : (context)->ast_node->source_line), \
+		__VA_ARGS__)
+
+/* Utility macros */
+
+#define sieve_command_pool(context) \
+	sieve_ast_node_pool((context)->ast_node)
+
+#define sieve_command_source_line(context) \
+	(context)->ast_node->source_line
+
+#define sieve_command_first_argument(context) \
+	sieve_ast_argument_first((context)->ast_node)
+
+#define sieve_command_is_toplevel(context) \
+	( sieve_ast_node_type(sieve_ast_node_parent((context)->ast_node)) == SAT_ROOT )
+#define sieve_command_is_first(context) \
+	( sieve_ast_node_prev((context)->ast_node) == NULL )
+
+/*
+ * Core commands
+ */
+
+extern const struct sieve_command_def cmd_require;
+extern const struct sieve_command_def cmd_stop;
+extern const struct sieve_command_def cmd_if;
+extern const struct sieve_command_def cmd_elsif;
+extern const struct sieve_command_def cmd_else;
+extern const struct sieve_command_def cmd_redirect;
+extern const struct sieve_command_def cmd_keep;
+extern const struct sieve_command_def cmd_discard;
+
+extern const struct sieve_command_def *sieve_core_commands[];
+extern const unsigned int sieve_core_commands_count;
+
+/*
+ * Core tests
+ */
+
+extern const struct sieve_command_def tst_true;
+extern const struct sieve_command_def tst_false;
+extern const struct sieve_command_def tst_not;
+extern const struct sieve_command_def tst_anyof;
+extern const struct sieve_command_def tst_allof;
+extern const struct sieve_command_def tst_address;
+extern const struct sieve_command_def tst_header;
+extern const struct sieve_command_def tst_exists;
+extern const struct sieve_command_def tst_size;
+
+extern const struct sieve_command_def *sieve_core_tests[];
+extern const unsigned int sieve_core_tests_count;
+
+/*
+ * Command utility functions
+ */
+
+bool sieve_command_verify_headers_argument
+(struct sieve_validator *valdtr, struct sieve_ast_argument *headers);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-common.h b/pigeonhole/src/lib-sieve/sieve-common.h
new file mode 100644
index 0000000..e79fb4d
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-common.h
@@ -0,0 +1,240 @@
+#ifndef SIEVE_COMMON_H
+#define SIEVE_COMMON_H
+
+#include "lib.h"
+
+#include "sieve.h"
+
+#include <sys/types.h>
+
+/*
+ * Types
+ */
+
+typedef size_t sieve_size_t;
+typedef uint32_t sieve_offset_t;
+typedef uint64_t sieve_number_t;
+
+#define SIEVE_MAX_NUMBER ((sieve_number_t)-1)
+#define SIEVE_PRI_NUMBER PRIu64
+
+/*
+ * Forward declarations
+ */
+
+/* sieve-error.h */
+struct sieve_error_handler;
+
+/* sieve-ast.h */
+enum sieve_ast_argument_type;
+
+struct sieve_ast;
+struct sieve_ast_node;
+struct sieve_ast_argument;
+
+/* sieve-commands.h */
+struct sieve_argument;
+struct sieve_argument_def;
+struct sieve_command;
+struct sieve_command_def;
+struct sieve_command_context;
+struct sieve_command_registration;
+
+/* sieve-stringlist.h */
+struct sieve_stringlist;
+
+/* sieve-code.h */
+struct sieve_operation_extension;
+
+/* sieve-lexer.h */
+struct sieve_lexer;
+
+/* sieve-parser.h */
+struct sieve_parser;
+
+/* sieve-validator.h */
+struct sieve_validator;
+
+/* sieve-generator.h */
+struct sieve_jumplist;
+struct sieve_generator;
+struct sieve_codegen_env;
+
+/* sieve-runtime.h */
+struct sieve_runtime_env;
+
+/* sieve-interpreter.h */
+struct sieve_interpreter;
+
+/* sieve-dump.h */
+struct sieve_dumptime_env;
+
+/* sieve-binary-dumper.h */
+struct sieve_binary_dumper;
+
+/* sieve-code-dumper.h */
+struct sieve_code_dumper;
+
+/* sieve-extension.h */
+struct sieve_extension;
+struct sieve_extension_def;
+struct sieve_extension_objects;
+
+/* sieve-code.h */
+struct sieve_operand;
+struct sieve_operand_def;
+struct sieve_operand_class;
+struct sieve_operation;
+struct sieve_coded_stringlist;
+
+/* sieve-binary.h */
+struct sieve_binary;
+struct sieve_binary_block;
+struct sieve_binary_debug_writer;
+struct sieve_binary_debug_reader;
+
+/* sieve-execute.h */
+struct sieve_execute;
+
+/* sieve-objects.h */
+struct sieve_object_def;
+struct sieve_object;
+
+/* sieve-comparator.h */
+struct sieve_comparator;
+
+/* sieve-match-types.h */
+struct sieve_match_type;
+
+/* sieve-match.h */
+struct sieve_match_context;
+
+/* sieve-address.h */
+struct sieve_address_list;
+
+/* sieve-address-parts.h */
+struct sieve_address_part_def;
+struct sieve_address_part;
+
+/* sieve-result.h */
+struct sieve_result;
+struct sieve_side_effects_list;
+struct sieve_result_print_env;
+
+/* sieve-actions.h */
+struct sieve_action_exec_env;
+struct sieve_action;
+struct sieve_action_def;
+struct sieve_side_effect;
+struct sieve_side_effect_def;
+
+/* sieve-script.h */
+struct sieve_script;
+struct sieve_script_sequence;
+
+/* sieve-storage.h */
+struct sieve_storage_class_registry;
+struct sieve_storage;
+
+/* sieve-message.h */
+struct sieve_message_context;
+struct sieve_message_override;
+struct sieve_message_override_def;
+
+/* sieve-plugins.h */
+struct sieve_plugin;
+
+/* sieve.c */
+struct sieve_ast *sieve_parse
+	(struct sieve_script *script, struct sieve_error_handler *ehandler,
+		enum sieve_error *error_r);
+bool sieve_validate
+	(struct sieve_ast *ast, struct sieve_error_handler *ehandler,
+		enum sieve_compile_flags flags, enum sieve_error *error_r);
+
+/*
+ * Parent category
+ */
+
+extern struct event_category event_category_sieve;
+
+/*
+ * Sieve engine instance
+ */
+
+#include "sieve-address-source.h"
+
+struct sieve_instance {
+	/* Main engine pool */
+	pool_t pool;
+
+	/* System environment */
+	const char *hostname;
+	const char *domainname;
+	const char *base_dir;
+	const char *temp_dir;
+
+	/* User environment */
+	const char *username;
+	const char *home_dir;
+
+	/* Flags */
+	enum sieve_flag flags;
+
+	/* Callbacks */
+	const struct sieve_callbacks *callbacks;
+	void *context;
+
+	/* Logging, events, and debug */
+	struct event *event;
+	bool debug;
+
+	/* Extension registry */
+	struct sieve_extension_registry *ext_reg;
+
+	/* Storage class registry */
+	struct sieve_storage_class_registry *storage_reg;
+
+	/* Plugin modules */
+	struct sieve_plugin *plugins;
+	enum sieve_env_location env_location;
+	enum sieve_delivery_phase delivery_phase;
+
+	/* Settings */
+	size_t max_script_size;
+	unsigned int max_actions;
+	unsigned int max_redirects;
+	unsigned int max_cpu_time_secs;
+	unsigned int resource_usage_timeout_secs;
+	const struct smtp_address *user_email, *user_email_implicit;
+	struct sieve_address_source redirect_from;
+	unsigned int redirect_duplicate_period;
+};
+
+/*
+ * Script trace log
+ */
+
+void sieve_trace_log_write_line
+	(struct sieve_trace_log *trace_log, const string_t *line)
+	ATTR_NULL(2);
+
+/*
+ * User e-mail address
+ */
+
+const struct smtp_address *sieve_get_user_email
+	(struct sieve_instance *svinst);
+
+/*
+ * Postmaster address 
+ */
+
+const struct message_address *
+sieve_get_postmaster(const struct sieve_script_env *senv);
+const struct smtp_address *
+sieve_get_postmaster_smtp(const struct sieve_script_env *senv);
+const char *
+sieve_get_postmaster_address(const struct sieve_script_env *senv);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-comparators.c b/pigeonhole/src/lib-sieve/sieve-comparators.c
new file mode 100644
index 0000000..56c33ab
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-comparators.c
@@ -0,0 +1,260 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+#include "hash.h"
+#include "array.h"
+
+#include "sieve-extensions.h"
+#include "sieve-code.h"
+#include "sieve-commands.h"
+#include "sieve-binary.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "sieve-comparators.h"
+
+#include <string.h>
+#include <stdio.h>
+
+/*
+ * Core comparators
+ */
+
+const struct sieve_comparator_def *sieve_core_comparators[] = {
+	&i_octet_comparator, &i_ascii_casemap_comparator
+};
+
+const unsigned int sieve_core_comparators_count =
+	N_ELEMENTS(sieve_core_comparators);
+
+/*
+ * Comparator 'extension'
+ */
+
+static bool cmp_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+
+const struct sieve_extension_def comparator_extension = {
+	.name = "@comparators",
+	.validator_load = cmp_validator_load
+};
+
+/*
+ * Validator context:
+ *   name-based comparator registry.
+ */
+
+static struct sieve_validator_object_registry *_get_object_registry
+(struct sieve_validator *valdtr)
+{
+	struct sieve_instance *svinst;
+	const struct sieve_extension *mcht_ext;
+
+	svinst = sieve_validator_svinst(valdtr);
+	mcht_ext = sieve_get_comparator_extension(svinst);
+	return sieve_validator_object_registry_get(valdtr, mcht_ext);
+}
+
+void sieve_comparator_register
+(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+	const struct sieve_comparator_def *cmp)
+{
+	struct sieve_validator_object_registry *regs = _get_object_registry(valdtr);
+
+	sieve_validator_object_registry_add(regs, ext, &cmp->obj_def);
+}
+
+static struct sieve_comparator *sieve_comparator_create
+(struct sieve_validator *valdtr, struct sieve_command *cmd,
+	const char *identifier)
+{
+	struct sieve_validator_object_registry *regs = _get_object_registry(valdtr);
+	struct sieve_object object;
+	struct sieve_comparator *cmp;
+
+	if ( !sieve_validator_object_registry_find(regs, identifier, &object) )
+		return NULL;
+
+	cmp = p_new(sieve_command_pool(cmd), struct sieve_comparator, 1);
+	cmp->object = object;
+	cmp->def = (const struct sieve_comparator_def *) object.def;
+
+  return cmp;
+}
+
+bool cmp_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	struct sieve_validator_object_registry *regs =
+		sieve_validator_object_registry_init(valdtr, ext);
+	unsigned int i;
+
+	/* Register core comparators */
+	for ( i = 0; i < sieve_core_comparators_count; i++ ) {
+		sieve_validator_object_registry_add
+			(regs, NULL, &(sieve_core_comparators[i]->obj_def));
+	}
+
+	return TRUE;
+}
+
+/*
+ * Comparator tagged argument
+ */
+
+/* Forward declarations */
+
+static bool tag_comparator_validate
+	(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *cmd);
+static bool tag_comparator_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+		struct sieve_command *cmd);
+
+/* Argument object */
+
+const struct sieve_argument_def comparator_tag = {
+	.identifier = "comparator",
+	.validate = tag_comparator_validate,
+	.generate = tag_comparator_generate
+};
+
+/* Argument implementation */
+
+static bool tag_comparator_validate
+(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+	struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+	const struct sieve_comparator *cmp;
+
+	/* Skip tag */
+	*arg = sieve_ast_argument_next(*arg);
+
+	/* Check syntax:
+	 *   ":comparator" <comparator-name: string>
+	 */
+	if ( !sieve_validate_tag_parameter
+		(valdtr, cmd, tag, *arg, NULL, 0, SAAT_STRING, FALSE) ) {
+		return FALSE;
+	}
+
+	/* FIXME: We can currently only handle string literal argument, so
+	 * variables are not allowed.
+	 */
+	if ( !sieve_argument_is_string_literal(*arg) ) {
+		sieve_argument_validate_error(valdtr, *arg,
+			"this Sieve implementation currently only supports "
+			"a literal string argument for the :comparator tag");
+		return FALSE;
+	}
+
+	/* Get comparator from registry */
+	cmp = sieve_comparator_create(valdtr, cmd, sieve_ast_argument_strc(*arg));
+
+	if ( cmp == NULL ) {
+		sieve_argument_validate_error(valdtr, *arg,
+			"unknown comparator '%s'",
+			str_sanitize(sieve_ast_argument_strc(*arg),80));
+
+		return FALSE;
+	}
+
+	/* String argument not needed during code generation, so detach it from
+	 * argument list
+	 */
+	*arg = sieve_ast_arguments_detach(*arg, 1);
+
+	/* Store comparator in context */
+	tag->argument->data = (void *) cmp;
+
+	return TRUE;
+}
+
+static bool tag_comparator_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+	struct sieve_command *cmd ATTR_UNUSED)
+{
+	const struct sieve_comparator *cmp =
+		(const struct sieve_comparator *) arg->argument->data;
+
+	sieve_opr_comparator_emit(cgenv->sblock, cmp);
+
+	return TRUE;
+}
+
+/* Functions to enable and evaluate comparator tag for commands */
+
+void sieve_comparators_link_tag
+(struct sieve_validator *valdtr, struct sieve_command_registration *cmd_reg,
+	int id_code)
+{
+	struct sieve_instance *svinst;
+	const struct sieve_extension *mcht_ext;
+
+	svinst = sieve_validator_svinst(valdtr);
+	mcht_ext = sieve_get_comparator_extension(svinst);
+
+	sieve_validator_register_tag
+		(valdtr, cmd_reg, mcht_ext, &comparator_tag, id_code);
+}
+
+bool sieve_comparator_tag_is
+(struct sieve_ast_argument *tag, const struct sieve_comparator_def *cmp_def)
+{
+	const struct sieve_comparator *cmp;
+
+	if ( !sieve_argument_is(tag, comparator_tag) )
+		return FALSE;
+
+	cmp = (const struct sieve_comparator *) tag->argument->data;
+
+	return ( cmp->def == cmp_def );
+}
+
+const struct sieve_comparator *sieve_comparator_tag_get
+(struct sieve_ast_argument *tag)
+{
+	if ( !sieve_argument_is(tag, comparator_tag) )
+		return NULL;
+
+
+	return (const struct sieve_comparator *) tag->argument->data;
+}
+
+/*
+ * Comparator coding
+ */
+
+const struct sieve_operand_class sieve_comparator_operand_class =
+	{ "comparator" };
+
+static const struct sieve_extension_objects core_comparators =
+	SIEVE_EXT_DEFINE_COMPARATORS(sieve_core_comparators);
+
+const struct sieve_operand_def comparator_operand = {
+	.name = "comparator",
+	.code = SIEVE_OPERAND_COMPARATOR,
+	.class = &sieve_comparator_operand_class,
+	.interface = &core_comparators
+};
+
+/*
+ * Trivial/Common comparator method implementations
+ */
+
+bool sieve_comparator_octet_skip
+	(const struct sieve_comparator *cmp ATTR_UNUSED,
+		const char **val, const char *val_end)
+{
+	if ( *val < val_end ) {
+		(*val)++;
+		return TRUE;
+	}
+
+	return FALSE;
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-comparators.h b/pigeonhole/src/lib-sieve/sieve-comparators.h
new file mode 100644
index 0000000..fdfb9ee
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-comparators.h
@@ -0,0 +1,153 @@
+#ifndef SIEVE_COMPARATORS_H
+#define SIEVE_COMPARATORS_H
+
+#include "sieve-common.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-objects.h"
+#include "sieve-code.h"
+
+/*
+ * Core comparators
+ */
+
+enum sieve_comparator_code {
+	SIEVE_COMPARATOR_I_OCTET,
+	SIEVE_COMPARATOR_I_ASCII_CASEMAP,
+	SIEVE_COMPARATOR_CUSTOM
+};
+
+extern const struct sieve_comparator_def i_octet_comparator;
+extern const struct sieve_comparator_def i_ascii_casemap_comparator;
+
+/*
+ * Comparator flags
+ */
+
+enum sieve_comparator_flags {
+	SIEVE_COMPARATOR_FLAG_ORDERING = (1 << 0),
+	SIEVE_COMPARATOR_FLAG_EQUALITY = (1 << 1),
+	SIEVE_COMPARATOR_FLAG_PREFIX_MATCH = (1 << 2),
+	SIEVE_COMPARATOR_FLAG_SUBSTRING_MATCH = (1 << 3),
+};
+
+/*
+ * Comparator definition
+ */
+
+struct sieve_comparator_def {
+	struct sieve_object_def obj_def;
+
+	unsigned int flags;
+
+	/* Equality and ordering */
+
+	int (*compare)(const struct sieve_comparator *cmp,
+		const char *val1, size_t val1_size,
+		const char *val2, size_t val2_size);
+
+	/* Prefix and substring match */
+
+	bool (*char_match)(const struct sieve_comparator *cmp,
+		const char **val, const char *val_end,
+		const char **key, const char *key_end);
+	bool (*char_skip)(const struct sieve_comparator *cmp,
+		const char **val, const char *val_end);
+};
+
+/*
+ * Comparator instance
+ */
+
+struct sieve_comparator {
+	struct sieve_object object;
+
+	const struct sieve_comparator_def *def;
+};
+
+#define SIEVE_COMPARATOR_DEFAULT(definition) \
+	{ SIEVE_OBJECT_DEFAULT(definition), &(definition) }
+
+#define sieve_comparator_name(cmp) \
+	( (cmp)->object.def->identifier )
+#define sieve_comparator_is(cmp, definition) \
+	( (cmp)->def == &(definition) )
+
+static inline const struct sieve_comparator *sieve_comparator_copy
+(pool_t pool, const struct sieve_comparator *cmp_orig)
+{
+	struct sieve_comparator *cmp = p_new(pool, struct sieve_comparator, 1);
+
+	*cmp = *cmp_orig;
+
+	return cmp;
+}
+
+/*
+ * Comparator tagged argument
+ */
+
+extern const struct sieve_argument_def comparator_tag;
+
+static inline bool sieve_argument_is_comparator
+(struct sieve_ast_argument *arg)
+{
+	return ( arg->argument != NULL &&
+		(arg->argument->def == &comparator_tag) );
+}
+
+void sieve_comparators_link_tag
+	(struct sieve_validator *validator,
+		struct sieve_command_registration *cmd_reg,	int id_code);
+bool sieve_comparator_tag_is
+	(struct sieve_ast_argument *tag, const struct sieve_comparator_def *cmp);
+const struct sieve_comparator *sieve_comparator_tag_get
+	(struct sieve_ast_argument *tag);
+
+void sieve_comparator_register
+	(struct sieve_validator *validator, const struct sieve_extension *ext,
+		const struct sieve_comparator_def *cmp);
+
+/*
+ * Comparator operand
+ */
+
+#define SIEVE_EXT_DEFINE_COMPARATOR(OP) SIEVE_EXT_DEFINE_OBJECT(OP)
+#define SIEVE_EXT_DEFINE_COMPARATORS(OPS) SIEVE_EXT_DEFINE_OBJECTS(OPS)
+
+extern const struct sieve_operand_class sieve_comparator_operand_class;
+extern const struct sieve_operand_def comparator_operand;
+
+static inline void sieve_opr_comparator_emit
+(struct sieve_binary_block *sblock, const struct sieve_comparator *cmp)
+{
+	sieve_opr_object_emit(sblock, cmp->object.ext, cmp->object.def);
+}
+static inline bool sieve_opr_comparator_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	return sieve_opr_object_dump
+		(denv, &sieve_comparator_operand_class, address, NULL);
+}
+
+static inline int sieve_opr_comparator_read
+(const struct sieve_runtime_env *renv, sieve_size_t *address,
+	struct sieve_comparator *cmp)
+{
+	if ( !sieve_opr_object_read
+		(renv, &sieve_comparator_operand_class, address, &cmp->object) )
+		return SIEVE_EXEC_BIN_CORRUPT;
+
+	cmp->def = (const struct sieve_comparator_def *) cmp->object.def;
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Trivial/Common comparator method implementations
+ */
+
+bool sieve_comparator_octet_skip
+	(const struct sieve_comparator *cmp ATTR_UNUSED,
+		const char **val, const char *val_end);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-config.h b/pigeonhole/src/lib-sieve/sieve-config.h
new file mode 100644
index 0000000..a0fed7c
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-config.h
@@ -0,0 +1,16 @@
+#ifndef SIEVE_CONFIG_H
+#define SIEVE_CONFIG_H
+
+#include "pigeonhole-config.h"
+#include "pigeonhole-version.h"
+
+#define SIEVE_IMPLEMENTATION PIGEONHOLE_NAME " Sieve " PIGEONHOLE_VERSION_FULL
+
+#define SIEVE_SCRIPT_FILEEXT "sieve"
+#define SIEVE_BINARY_FILEEXT "svbin"
+
+#define DEFAULT_ENVELOPE_SENDER "MAILER-DAEMON"
+
+#define DEFAULT_REDIRECT_DUPLICATE_PERIOD (3600 * 12)
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-dump.h b/pigeonhole/src/lib-sieve/sieve-dump.h
new file mode 100644
index 0000000..d704877
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-dump.h
@@ -0,0 +1,30 @@
+#ifndef SIEVE_DUMP_H
+#define SIEVE_DUMP_H
+
+#include "sieve-common.h"
+#include "sieve-code-dumper.h"
+#include "sieve-binary-dumper.h"
+
+/*
+ * Dumptime environment
+ */
+
+struct sieve_dumptime_env {
+	/* Dumpers */
+	struct sieve_instance *svinst;
+	struct sieve_binary_dumper *dumper;
+	struct sieve_code_dumper *cdumper;
+
+	/* Binary */
+	struct sieve_binary *sbin;
+	struct sieve_binary_block *sblock;
+
+	/* Code position */
+	const struct sieve_operation *oprtn;
+	sieve_size_t offset;
+
+	/* Output stream */
+	struct ostream *stream;
+};
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-error-private.h b/pigeonhole/src/lib-sieve/sieve-error-private.h
new file mode 100644
index 0000000..e0172b2
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-error-private.h
@@ -0,0 +1,67 @@
+#ifndef SIEVE_ERROR_PRIVATE_H
+#define SIEVE_ERROR_PRIVATE_H
+
+#include "sieve-error.h"
+
+/*
+ * Initialization
+ */
+
+void sieve_errors_init(struct sieve_instance *svinst);
+void sieve_errors_deinit(struct sieve_instance *svinst);
+
+/*
+ * Error handler object
+ */
+
+struct sieve_error_handler {
+	pool_t pool;
+	int refcount;
+
+	struct sieve_instance *svinst;
+
+	unsigned int max_errors;
+
+	unsigned int errors;
+	unsigned int warnings;
+
+	void (*log)(struct sieve_error_handler *ehandler,
+		    const struct sieve_error_params *params,
+		    enum sieve_error_flags flags,
+		    const char *message);
+
+	void (*free)(struct sieve_error_handler *ehandler);
+
+	bool master_log:1;   /* this logs through master log facility */
+	bool log_info:1;     /* handle or discard info log */
+	bool log_debug:1;    /* handle or discard debug log */
+};
+
+void sieve_error_handler_init(struct sieve_error_handler *ehandler,
+			      struct sieve_instance *svinst, pool_t pool,
+			      unsigned int max_errors);
+
+/*
+ * Direct handler calls
+ */
+
+void sieve_direct_logv(struct sieve_instance *svinst,
+		       struct sieve_error_handler *ehandler,
+		       const struct sieve_error_params *params,
+		       enum sieve_error_flags flags,
+		       const char *fmt, va_list args) ATTR_FORMAT(5, 0);
+
+static inline void ATTR_FORMAT(5, 6)
+sieve_direct_log(struct sieve_instance *svinst,
+		 struct sieve_error_handler *ehandler,
+		 const struct sieve_error_params *params,
+		 enum sieve_error_flags flags, const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	sieve_direct_logv(svinst, ehandler, params, flags, fmt, args);
+	va_end(args);
+}
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-error.c b/pigeonhole/src/lib-sieve/sieve-error.c
new file mode 100644
index 0000000..aae13a5
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-error.c
@@ -0,0 +1,1064 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "array.h"
+#include "ostream.h"
+#include "var-expand.h"
+#include "eacces-error.h"
+
+#include "sieve-common.h"
+#include "sieve-script.h"
+#include "sieve-error-private.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <ctype.h>
+
+/*
+ * Definitions
+ */
+
+#define CRITICAL_MSG \
+	"internal error occurred: refer to server log for more information."
+#define CRITICAL_MSG_STAMP CRITICAL_MSG " [%Y-%m-%d %H:%M:%S]"
+
+/* Logfile error handler will rotate log when it exceeds 10k bytes */
+#define LOGFILE_MAX_SIZE (10 * 1024)
+
+/*
+ * Utility
+ */
+
+const char *
+sieve_error_script_location(const struct sieve_script *script,
+			    unsigned int source_line)
+{
+	const char *sname;
+
+	sname = (script == NULL ? NULL : sieve_script_name(script));
+
+	if (sname == NULL || *sname == '\0') {
+		if (source_line == 0)
+			return NULL;
+
+		return t_strdup_printf("line %d", source_line);
+	}
+
+	if (source_line == 0)
+		return sname;
+
+	return t_strdup_printf("%s: line %d", sname, source_line);
+}
+
+const char *sieve_error_from_external(const char *msg)
+{
+	char *new_msg;
+
+	if (msg == NULL || *msg == '\0')
+		return msg;
+
+	new_msg = t_strdup_noconst(msg);
+	new_msg[0] = i_tolower(new_msg[0]);
+
+	return new_msg;
+}
+
+/*
+ * Initialization
+ */
+
+void sieve_errors_init(struct sieve_instance *svinst ATTR_UNUSED)
+{
+	/* nothing */
+}
+
+void sieve_errors_deinit(struct sieve_instance *svinst ATTR_UNUSED)
+{
+	/* nothing */
+}
+
+/*
+ * Direct handler calls
+ */
+
+static void
+sieve_direct_master_log(struct sieve_instance *svinst,
+			const struct sieve_error_params *params,
+			const char *message)
+{
+	struct event_log_params event_params = {
+		.log_type = params->log_type,
+		.source_filename = params->csrc.filename,
+		.source_linenum = params->csrc.linenum,
+
+		.base_event = svinst->event,
+	};
+	struct event *event = (params->event != NULL ?
+			       params->event : svinst->event);
+
+	if (params->location != NULL && *params->location != '\0') {
+		event_params.base_send_prefix =
+			 t_strconcat(params->location, ": ", NULL);
+	}
+
+	event_log(event, &event_params, "%s", message);
+}
+
+void sieve_direct_logv(struct sieve_instance *svinst,
+		       struct sieve_error_handler *ehandler,
+		       const struct sieve_error_params *params,
+		       enum sieve_error_flags flags,
+		       const char *fmt, va_list args)
+{
+	struct event_log_params event_params = {
+		.log_type = params->log_type,
+		.source_filename = params->csrc.filename,
+		.source_linenum = params->csrc.linenum,
+		.base_event = svinst->event,
+		.base_str_out = NULL,
+		.no_send = TRUE,
+	};
+	struct event *event = (params->event != NULL ?
+			       params->event : svinst->event);
+	bool event_log = FALSE, ehandler_log = FALSE;
+
+	if (ehandler != NULL) {
+		switch (params->log_type) {
+		case LOG_TYPE_ERROR:
+			ehandler_log = sieve_errors_more_allowed(ehandler);
+			break;
+		case LOG_TYPE_WARNING:
+			ehandler_log = TRUE;
+			break;
+		case LOG_TYPE_INFO:
+			ehandler_log = ehandler->log_info;
+			break;
+		case LOG_TYPE_DEBUG:
+			ehandler_log = ehandler->log_debug;
+			break;
+		case LOG_TYPE_FATAL:
+		case LOG_TYPE_PANIC:
+		case LOG_TYPE_COUNT:
+		case LOG_TYPE_OPTION:
+			i_unreached();
+		}
+	}
+
+	if (ehandler != NULL && ehandler->master_log) {
+		event_log = ehandler_log;
+		ehandler_log = FALSE;
+	}
+	if ((flags & SIEVE_ERROR_FLAG_GLOBAL) != 0) {
+		event_log = TRUE;
+		if ((flags & SIEVE_ERROR_FLAG_GLOBAL_MAX_INFO) != 0 &&
+		    params->log_type > LOG_TYPE_INFO)
+			event_params.log_type = LOG_TYPE_INFO;
+	}
+
+	if (event_log) {
+		event_params.no_send = FALSE;
+		if (params->location != NULL && *params->location != '\0') {
+			event_params.base_send_prefix =
+				t_strconcat(params->location, ": ", NULL);
+		}
+	}
+	if (ehandler_log) {
+		if (ehandler->log == NULL)
+			ehandler_log = FALSE;
+		else
+			event_params.base_str_out = t_str_new(128);
+	}
+
+	if (event_log || ehandler_log)
+		event_logv(event, &event_params, fmt, args);
+
+	if (ehandler_log) {
+		ehandler->log(ehandler, params, flags,
+			      str_c(event_params.base_str_out));
+	}
+
+	if (ehandler != NULL && ehandler->pool != NULL) {
+		switch (params->log_type) {
+		case LOG_TYPE_ERROR:
+			ehandler->errors++;
+			break;
+		case LOG_TYPE_WARNING:
+			ehandler->warnings++;
+			break;
+		default:
+			break;
+		}
+	}
+}
+
+/*
+ * User errors
+ */
+
+void sieve_global_logv(struct sieve_instance *svinst,
+		       struct sieve_error_handler *ehandler,
+		       const struct sieve_error_params *params,
+		       const char *fmt, va_list args)
+{
+	sieve_direct_logv(svinst, ehandler, params,
+			  SIEVE_ERROR_FLAG_GLOBAL, fmt, args);
+}
+
+void sieve_global_info_logv(struct sieve_instance *svinst,
+			    struct sieve_error_handler *ehandler,
+			    const struct sieve_error_params *params,
+			    const char *fmt, va_list args)
+{
+	sieve_direct_logv(svinst, ehandler, params,
+			  (SIEVE_ERROR_FLAG_GLOBAL |
+			   SIEVE_ERROR_FLAG_GLOBAL_MAX_INFO), fmt, args);
+}
+
+#undef sieve_global_error
+void sieve_global_error(struct sieve_instance *svinst,
+			struct sieve_error_handler *ehandler,
+			const char *csrc_filename, unsigned int csrc_linenum,
+			const char *location, const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_ERROR,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+		.location = location,
+	};
+	va_list args;
+	va_start(args, fmt);
+
+	T_BEGIN {
+		sieve_global_logv(svinst, ehandler, &params, fmt, args);
+	} T_END;
+
+	va_end(args);
+}
+
+#undef sieve_global_warning
+void sieve_global_warning(struct sieve_instance *svinst,
+			  struct sieve_error_handler *ehandler,
+			  const char *csrc_filename, unsigned int csrc_linenum,
+			  const char *location, const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_WARNING,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+		.location = location,
+	};
+	va_list args;
+	va_start(args, fmt);
+
+	T_BEGIN {
+		sieve_global_logv(svinst, ehandler, &params, fmt, args);
+	} T_END;
+
+	va_end(args);
+}
+
+#undef sieve_global_info
+void sieve_global_info(struct sieve_instance *svinst,
+		       struct sieve_error_handler *ehandler,
+		       const char *csrc_filename, unsigned int csrc_linenum,
+		       const char *location, const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_INFO,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+		.location = location,
+	};
+	va_list args;
+	va_start(args, fmt);
+
+	T_BEGIN {
+		sieve_global_logv(svinst, ehandler, &params, fmt, args);
+	} T_END;
+
+	va_end(args);
+}
+
+#undef sieve_global_info_error
+void sieve_global_info_error(struct sieve_instance *svinst,
+			     struct sieve_error_handler *ehandler,
+			     const char *csrc_filename,
+			     unsigned int csrc_linenum,
+			     const char *location, const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_ERROR,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+		.location = location,
+	};
+	va_list args;
+	va_start(args, fmt);
+
+	T_BEGIN {
+		sieve_global_info_logv(svinst, ehandler, &params, fmt, args);
+	} T_END;
+
+	va_end(args);
+}
+
+#undef sieve_global_info_warning
+void sieve_global_info_warning(struct sieve_instance *svinst,
+			       struct sieve_error_handler *ehandler,
+			       const char *csrc_filename,
+			       unsigned int csrc_linenum,
+			       const char *location, const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_WARNING,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+		.location = location,
+	};
+	va_list args;
+	va_start(args, fmt);
+
+	T_BEGIN {
+		sieve_global_info_logv(svinst, ehandler, &params, fmt, args);
+	} T_END;
+
+	va_end(args);
+}
+
+/*
+ * Default (user) error functions
+ */
+
+void sieve_internal_error_params(struct sieve_error_handler *ehandler,
+				 const struct sieve_error_params *params,
+				 const char *user_prefix)
+{
+	char str[256];
+	const char *msg;
+	struct tm *tm;
+
+	if (ehandler == NULL || ehandler->master_log)
+		return;
+
+	tm = localtime(&ioloop_time);
+	msg = (strftime(str, sizeof(str), CRITICAL_MSG_STAMP, tm) > 0 ?
+	       str : CRITICAL_MSG);
+
+	if (user_prefix == NULL || *user_prefix == '\0') {
+		sieve_direct_log(ehandler->svinst, ehandler, params, 0,
+				 "%s", msg);
+	} else {
+		sieve_direct_log(ehandler->svinst, ehandler, params, 0,
+				 "%s: %s", user_prefix, msg);
+	}
+}
+
+#undef sieve_internal_error
+void sieve_internal_error(struct sieve_error_handler *ehandler,
+			  const char *csrc_filename, unsigned int csrc_linenum,
+			  const char *location, const char *user_prefix)
+
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_ERROR,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+		.location = location,
+	};
+
+	sieve_internal_error_params(ehandler, &params, user_prefix);
+}
+
+void sieve_logv(struct sieve_error_handler *ehandler,
+		const struct sieve_error_params *params,
+		const char *fmt, va_list args)
+{
+	if (ehandler == NULL) return;
+
+	sieve_direct_logv(ehandler->svinst, ehandler, params, 0, fmt, args);
+}
+
+void sieve_event_logv(struct sieve_instance *svinst,
+		      struct sieve_error_handler *ehandler,
+		      struct event *event,  enum log_type log_type,
+		      const char *csrc_filename, unsigned int csrc_linenum,
+		      const char *location, enum sieve_error_flags flags,
+		      const char *fmt, va_list args)
+{
+	struct sieve_error_params params = {
+		.log_type = log_type,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+		.event = event,
+		.location = location,
+	};
+
+	T_BEGIN {
+		sieve_direct_logv(svinst, ehandler, &params, flags, fmt, args);
+	} T_END;
+}
+
+
+#undef sieve_event_log
+void sieve_event_log(struct sieve_instance *svinst,
+		     struct sieve_error_handler *ehandler,
+		     struct event *event,  enum log_type log_type,
+		     const char *csrc_filename, unsigned int csrc_linenum,
+		     const char *location, enum sieve_error_flags flags,
+		     const char *fmt, ...)
+{
+	va_list args;
+	va_start(args, fmt);
+
+	sieve_event_logv(svinst, ehandler, event, log_type, csrc_filename,
+			 csrc_linenum, location, flags, fmt, args);
+
+	va_end(args);
+}
+
+void sieve_criticalv(struct sieve_instance *svinst,
+		     struct sieve_error_handler *ehandler,
+		     const struct sieve_error_params *params,
+		     const char *user_prefix, const char *fmt, va_list args)
+{
+	struct sieve_error_params new_params = *params;
+
+	new_params.log_type = LOG_TYPE_ERROR;
+
+	sieve_direct_master_log(svinst, &new_params,
+				t_strdup_vprintf(fmt, args));
+	sieve_internal_error_params(ehandler, &new_params, user_prefix);
+}
+
+#undef sieve_error
+void sieve_error(struct sieve_error_handler *ehandler,
+		 const char *csrc_filename, unsigned int csrc_linenum,
+		 const char *location, const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_ERROR,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+		.location = location,
+	};
+	va_list args;
+	va_start(args, fmt);
+
+	T_BEGIN {
+		sieve_logv(ehandler, &params, fmt, args);
+	} T_END;
+
+	va_end(args);
+}
+
+#undef sieve_warning
+void sieve_warning(struct sieve_error_handler *ehandler,
+		   const char *csrc_filename, unsigned int csrc_linenum,
+		   const char *location, const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_WARNING,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+		.location = location,
+	};
+	va_list args;
+	va_start(args, fmt);
+
+	T_BEGIN {
+		sieve_logv(ehandler, &params, fmt, args);
+	} T_END;
+
+	va_end(args);
+}
+
+#undef sieve_info
+void sieve_info(struct sieve_error_handler *ehandler,
+		const char *csrc_filename, unsigned int csrc_linenum,
+		const char *location, const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_INFO,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+		.location = location,
+	};
+	va_list args;
+	va_start(args, fmt);
+
+	T_BEGIN {
+		sieve_logv(ehandler, &params, fmt, args);
+	} T_END;
+
+	va_end(args);
+}
+
+#undef sieve_debug
+void sieve_debug(struct sieve_error_handler *ehandler,
+		 const char *csrc_filename, unsigned int csrc_linenum,
+		 const char *location, const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_DEBUG,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+		.location = location,
+	};
+	va_list args;
+	va_start(args, fmt);
+
+	T_BEGIN {
+		sieve_logv(ehandler, &params, fmt, args);
+	} T_END;
+
+	va_end(args);
+}
+
+#undef sieve_critical
+void sieve_critical(struct sieve_instance *svinst,
+		    struct sieve_error_handler *ehandler,
+		    const char *csrc_filename, unsigned int csrc_linenum,
+		    const char *location, const char *user_prefix,
+		    const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_ERROR,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+		.location = location,
+	};
+	va_list args;
+
+	va_start(args, fmt);
+
+	T_BEGIN {
+		sieve_criticalv(svinst, ehandler, &params, user_prefix,
+				fmt, args);
+	} T_END;
+
+	va_end(args);
+}
+
+/*
+ * Error statistics
+ */
+
+unsigned int sieve_get_errors(struct sieve_error_handler *ehandler)
+{
+	if (ehandler == NULL || ehandler->pool == NULL)
+		return 0;
+
+	return ehandler->errors;
+}
+
+unsigned int sieve_get_warnings(struct sieve_error_handler *ehandler)
+{
+	if (ehandler == NULL || ehandler->pool == NULL)
+		return 0;
+
+	return ehandler->warnings;
+}
+
+bool sieve_errors_more_allowed(struct sieve_error_handler *ehandler)
+{
+	if (ehandler == NULL || ehandler->pool == NULL)
+		return TRUE;
+
+	return (ehandler->max_errors == 0 ||
+		ehandler->errors < ehandler->max_errors);
+}
+
+/*
+ * Error handler configuration
+ */
+
+void sieve_error_handler_accept_infolog(struct sieve_error_handler *ehandler,
+					bool enable)
+{
+	ehandler->log_info = enable;
+}
+
+void sieve_error_handler_accept_debuglog(struct sieve_error_handler *ehandler,
+					 bool enable)
+{
+	ehandler->log_debug = enable;
+}
+
+/*
+ * Error handler init
+ */
+
+void sieve_error_handler_init(struct sieve_error_handler *ehandler,
+			      struct sieve_instance *svinst,
+			      pool_t pool, unsigned int max_errors)
+{
+	ehandler->pool = pool;
+	ehandler->svinst = svinst;
+	ehandler->refcount = 1;
+	ehandler->max_errors = max_errors;
+
+	ehandler->errors = 0;
+	ehandler->warnings = 0;
+}
+
+void sieve_error_handler_ref(struct sieve_error_handler *ehandler)
+{
+	if (ehandler == NULL || ehandler->pool == NULL)
+		return;
+
+	ehandler->refcount++;
+}
+
+void sieve_error_handler_unref(struct sieve_error_handler **ehandler)
+{
+	if (*ehandler == NULL || (*ehandler)->pool == NULL)
+		return;
+
+	i_assert((*ehandler)->refcount > 0);
+
+	if (--(*ehandler)->refcount != 0)
+        	return;
+
+	if ((*ehandler)->free != NULL)
+		(*ehandler)->free(*ehandler);
+
+	pool_unref(&((*ehandler)->pool));
+	*ehandler = NULL;
+}
+
+void sieve_error_handler_reset(struct sieve_error_handler *ehandler)
+{
+	if (ehandler == NULL || ehandler->pool == NULL)
+		return;
+
+	ehandler->errors = 0;
+	ehandler->warnings = 0;
+}
+
+/*
+ * Error params utility
+ */
+
+static void
+sieve_error_params_add_prefix(struct sieve_error_handler *ehandler ATTR_UNUSED,
+			      const struct sieve_error_params *params,
+			      string_t *prefix)
+{
+	if (params->location != NULL && *params->location != '\0') {
+		str_append(prefix, params->location);
+		str_append(prefix, ": ");
+	}
+
+	switch (params->log_type) {
+	case LOG_TYPE_ERROR:
+		str_append(prefix, "error: ");
+		break;
+	case LOG_TYPE_WARNING:
+		str_append(prefix, "warning: ");
+		break;
+	case LOG_TYPE_INFO:
+		str_append(prefix, "info: ");
+		break;
+	case LOG_TYPE_DEBUG:
+		str_append(prefix, "debug: ");
+		break;
+	default:
+		i_unreached();
+	}
+}
+
+/*
+ * Master/System error handler
+ *
+ * - Output errors directly to Dovecot master log
+ */
+
+struct sieve_error_handler *
+sieve_master_ehandler_create(struct sieve_instance *svinst,
+			     unsigned int max_errors)
+{
+	struct sieve_error_handler *ehandler;
+	pool_t pool;
+
+	pool = pool_alloconly_create("master_error_handler", 256);
+	ehandler = p_new(pool, struct sieve_error_handler, 1);
+	sieve_error_handler_init(ehandler, svinst, pool, max_errors);
+	ehandler->master_log = TRUE;
+	ehandler->log_debug = svinst->debug;
+
+	return ehandler;
+}
+
+/*
+ * STDERR error handler
+ *
+ * - Output errors directly to stderror
+ */
+
+static void
+sieve_stderr_log(struct sieve_error_handler *ehandler,
+		 const struct sieve_error_params *params,
+		 enum sieve_error_flags flags ATTR_UNUSED,
+		 const char *message)
+{
+	string_t *prefix = t_str_new(64);
+
+	sieve_error_params_add_prefix(ehandler, params, prefix);
+
+	fprintf(stderr, "%s%s.\n", str_c(prefix), message);
+}
+
+struct sieve_error_handler *
+sieve_stderr_ehandler_create(struct sieve_instance *svinst,
+			     unsigned int max_errors)
+{
+	pool_t pool;
+	struct sieve_error_handler *ehandler;
+
+	/* Pool is not strictly necessary, but other handler types will need
+	 * a pool, so this one will have one too.
+	 */
+	pool = pool_alloconly_create("stderr_error_handler",
+				     sizeof(struct sieve_error_handler));
+	ehandler = p_new(pool, struct sieve_error_handler, 1);
+	sieve_error_handler_init(ehandler, svinst, pool, max_errors);
+
+	ehandler->log = sieve_stderr_log;
+
+	return ehandler;
+}
+
+/* String buffer error handler
+ *
+ * - Output errors to a string buffer
+ */
+
+struct sieve_strbuf_ehandler {
+	struct sieve_error_handler handler;
+
+	string_t *errors;
+	bool crlf;
+};
+
+static void
+sieve_strbuf_log(struct sieve_error_handler *ehandler,
+		 const struct sieve_error_params *params,
+		 enum sieve_error_flags flags ATTR_UNUSED, const char *message)
+{
+	struct sieve_strbuf_ehandler *handler =
+		(struct sieve_strbuf_ehandler *) ehandler;
+
+	sieve_error_params_add_prefix(ehandler, params, handler->errors);
+	str_append(handler->errors, message);
+
+	if (!handler->crlf)
+		str_append(handler->errors, ".\n");
+	else
+		str_append(handler->errors, ".\r\n");
+}
+
+struct sieve_error_handler *
+sieve_strbuf_ehandler_create(struct sieve_instance *svinst, string_t *strbuf,
+			     bool crlf, unsigned int max_errors)
+{
+	pool_t pool;
+	struct sieve_strbuf_ehandler *ehandler;
+
+	pool = pool_alloconly_create("strbuf_error_handler", 256);
+	ehandler = p_new(pool, struct sieve_strbuf_ehandler, 1);
+	ehandler->errors = strbuf;
+
+	sieve_error_handler_init(&ehandler->handler, svinst, pool, max_errors);
+
+	ehandler->handler.log = sieve_strbuf_log;
+	ehandler->crlf = crlf;
+
+	return &(ehandler->handler);
+}
+
+/*
+ * Logfile error handler
+ *
+ * - Output errors to a log file
+ */
+
+struct sieve_logfile_ehandler {
+	struct sieve_error_handler handler;
+
+	const char *logfile;
+	bool started;
+	int fd;
+	struct ostream *stream;
+};
+
+static void
+sieve_logfile_write(struct sieve_logfile_ehandler *ehandler,
+		    const struct sieve_error_params *params,
+		    const char *message)
+{
+	string_t *outbuf;
+	ssize_t ret = 0, remain;
+	const char *data;
+
+	if (ehandler->stream == NULL)
+		return;
+
+	T_BEGIN {
+		outbuf = t_str_new(256);
+		sieve_error_params_add_prefix(&ehandler->handler,
+					      params, outbuf);
+		str_append(outbuf, message);
+		str_append(outbuf, ".\n");
+
+		remain = str_len(outbuf);
+		data = (const char *) str_data(outbuf);
+
+		while (remain > 0) {
+			if ((ret = o_stream_send(ehandler->stream,
+						 data, remain)) < 0)
+				break;
+
+			remain -= ret;
+			data += ret;
+		}
+	} T_END;
+
+	if (ret < 0) {
+		e_error(ehandler->handler.svinst->event,
+			"o_stream_send() failed on logfile %s: %m",
+			ehandler->logfile);
+	}
+}
+
+inline static void ATTR_FORMAT(5, 6)
+sieve_logfile_printf(struct sieve_logfile_ehandler *ehandler,
+		     const char *csrc_filename, unsigned int csrc_linenum,
+		     const char *location, const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_INFO,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+		.location = location,
+	};
+	va_list args;
+	va_start(args, fmt);
+
+	sieve_logfile_write(ehandler, &params, t_strdup_vprintf(fmt, args));
+
+	va_end(args);
+}
+
+static void sieve_logfile_start(struct sieve_logfile_ehandler *ehandler)
+{
+	struct sieve_instance *svinst = ehandler->handler.svinst;
+	struct ostream *ostream = NULL;
+	struct stat st;
+	struct tm *tm;
+	char buf[256];
+	time_t now;
+	int fd;
+
+	/* Open the logfile */
+
+	fd = open(ehandler->logfile, O_CREAT | O_APPEND | O_WRONLY, 0600);
+	if (fd == -1) {
+		if (errno == EACCES) {
+			e_error(svinst->event,
+				"failed to open logfile "
+				"(LOGGING TO STDERR): %s",
+				eacces_error_get_creating("open",
+							  ehandler->logfile));
+		} else {
+			e_error(svinst->event, "failed to open logfile "
+				"(LOGGING TO STDERR): "
+				"open(%s) failed: %m", ehandler->logfile);
+		}
+		fd = STDERR_FILENO;
+	} else {
+		/* fd_close_on_exec(fd, TRUE); Necessary? */
+
+		/* Stat the log file to obtain size information */
+		if (fstat(fd, &st) != 0) {
+			e_error(svinst->event, "failed to stat logfile "
+				"(logging to STDERR): "
+				"fstat(fd=%s) failed: %m", ehandler->logfile);
+
+			if (close(fd) < 0) {
+				e_error(svinst->event,
+					"failed to close logfile after error: "
+					"close(fd=%s) failed: %m",
+					ehandler->logfile);
+			}
+
+			fd = STDERR_FILENO;
+		}
+
+		/* Rotate log when it has grown too large */
+		if (st.st_size >= LOGFILE_MAX_SIZE) {
+			const char *rotated;
+
+			/* Close open file */
+			if (close(fd) < 0) {
+				e_error(svinst->event,
+					"failed to close logfile: "
+					"close(fd=%s) failed: %m",
+					ehandler->logfile);
+			}
+
+			/* Rotate logfile */
+			rotated = t_strconcat(ehandler->logfile, ".0", NULL);
+			if (rename(ehandler->logfile, rotated) < 0 &&
+			    errno != ENOENT) {
+				if (errno == EACCES) {
+					const char *target =
+						t_strconcat(ehandler->logfile,
+							    ", ", rotated, NULL);
+					e_error(svinst->event,
+						"failed to rotate logfile: %s",
+						eacces_error_get_creating(
+							"rename", target));
+				} else {
+					e_error(svinst->event,
+						"failed to rotate logfile: "
+						"rename(%s, %s) failed: %m",
+						ehandler->logfile, rotated);
+				}
+			}
+
+			/* Open clean logfile (overwrites existing if rename() failed earlier) */
+			fd = open(ehandler->logfile,
+				O_CREAT | O_APPEND | O_WRONLY | O_TRUNC, 0600);
+			if (fd == -1) {
+				if (errno == EACCES) {
+					e_error(svinst->event,
+						"failed to open logfile "
+						"(LOGGING TO STDERR): %s",
+						eacces_error_get_creating(
+							"open", ehandler->logfile));
+				} else {
+					e_error(svinst->event,
+						"failed to open logfile "
+						"(LOGGING TO STDERR): "
+						"open(%s) failed: %m",
+						ehandler->logfile);
+				}
+				fd = STDERR_FILENO;
+			}
+		}
+	}
+
+	ostream = o_stream_create_fd(fd, 0);
+	if (ostream == NULL) {
+		/* Can't we do anything else in this most awkward situation? */
+		e_error(svinst->event,
+			"failed to open log stream on open file: "
+			"o_stream_create_fd(fd=%s) failed "
+			"(non-critical messages are not logged!)",
+			ehandler->logfile);
+	}
+
+	ehandler->fd = fd;
+	ehandler->stream = ostream;
+	ehandler->started = TRUE;
+
+	if (ostream != NULL) {
+		now = time(NULL);
+		tm = localtime(&now);
+
+		if (strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S %z", tm) > 0) {
+			sieve_logfile_printf(ehandler, __FILE__, __LINE__,
+					     "sieve", "started log at %s", buf);
+		}
+	}
+}
+
+static void
+sieve_logfile_log(struct sieve_error_handler *ehandler,
+		  const struct sieve_error_params *params,
+		  enum sieve_error_flags flags ATTR_UNUSED,
+		  const char *message)
+{
+	struct sieve_logfile_ehandler *handler =
+		(struct sieve_logfile_ehandler *) ehandler;
+
+	if (!handler->started)
+		sieve_logfile_start(handler);
+
+	sieve_logfile_write(handler, params, message);
+}
+
+static void sieve_logfile_free(struct sieve_error_handler *ehandler)
+{
+	struct sieve_logfile_ehandler *handler =
+		(struct sieve_logfile_ehandler *) ehandler;
+
+	if (handler->stream != NULL) {
+		o_stream_destroy(&(handler->stream));
+		if (handler->fd != STDERR_FILENO) {
+			if (close(handler->fd) < 0) {
+				e_error(ehandler->svinst->event,
+					"failed to close logfile: "
+					"close(fd=%s) failed: %m",
+					handler->logfile);
+			}
+		}
+	}
+}
+
+struct sieve_error_handler *
+sieve_logfile_ehandler_create(struct sieve_instance *svinst,
+			      const char *logfile, unsigned int max_errors)
+{
+	pool_t pool;
+	struct sieve_logfile_ehandler *ehandler;
+
+	pool = pool_alloconly_create("logfile_error_handler", 512);
+	ehandler = p_new(pool, struct sieve_logfile_ehandler, 1);
+	sieve_error_handler_init(&ehandler->handler, svinst, pool, max_errors);
+
+	ehandler->handler.log = sieve_logfile_log;
+	ehandler->handler.free = sieve_logfile_free;
+
+	/* Don't open logfile until something is actually logged.
+	 * Let's not pullute the sieve directory with useless logfiles.
+	 */
+	ehandler->logfile = p_strdup(pool, logfile);
+	ehandler->started = FALSE;
+	ehandler->stream = NULL;
+	ehandler->fd = -1;
+
+	return &(ehandler->handler);
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-error.h b/pigeonhole/src/lib-sieve/sieve-error.h
new file mode 100644
index 0000000..83b26b7
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-error.h
@@ -0,0 +1,235 @@
+#ifndef SIEVE_ERROR_H
+#define SIEVE_ERROR_H
+
+#include "lib.h"
+#include "compat.h"
+
+#include <stdarg.h>
+
+/*
+ * Forward declarations
+ */
+
+struct var_expand_table;
+
+struct sieve_instance;
+struct sieve_script;
+struct sieve_error_handler;
+
+/*
+ * Types
+ */
+
+enum sieve_error_flags {
+	SIEVE_ERROR_FLAG_GLOBAL = (1 << 0),
+	SIEVE_ERROR_FLAG_GLOBAL_MAX_INFO = (1 << 1),
+};
+
+struct sieve_error_params {
+	enum log_type log_type;
+	struct event *event;
+
+	/* Location log command in C source code */
+	struct {
+		const char *filename;
+		unsigned int linenum;
+	} csrc;
+
+	/* Location in Sieve source script */
+	const char *location;
+};
+
+/*
+ * Utility
+ */
+
+/* Converts external messages to a style that better matches Sieve user errors
+ */
+const char *sieve_error_from_external(const char *msg);
+
+/*
+ * Global (user+system) errors
+ */
+
+void sieve_global_logv(struct sieve_instance *svinst,
+		       struct sieve_error_handler *ehandler,
+		       const struct sieve_error_params *params,
+		       const char *fmt, va_list args) ATTR_FORMAT(4, 0);
+void sieve_global_info_logv(struct sieve_instance *svinst,
+			    struct sieve_error_handler *ehandler,
+			    const struct sieve_error_params *params,
+			    const char *fmt, va_list args) ATTR_FORMAT(4, 0);
+
+void sieve_global_error(struct sieve_instance *svinst,
+			struct sieve_error_handler *ehandler,
+			const char *csrc_filename,
+			unsigned int csrc_linenum,
+			const char *location, const char *fmt, ...)
+			ATTR_FORMAT(6, 7);
+#define sieve_global_error(svinst, ehandler, ...) \
+	sieve_global_error(svinst, ehandler, __FILE__, __LINE__, __VA_ARGS__)
+void sieve_global_warning(struct sieve_instance *svinst,
+			  struct sieve_error_handler *ehandler,
+			  const char *csrc_filename,
+			  unsigned int csrc_linenum,
+			  const char *location, const char *fmt, ...)
+			  ATTR_FORMAT(6, 7);
+#define sieve_global_warning(svinst, ehandler, ...) \
+	sieve_global_warning(svinst, ehandler, __FILE__, __LINE__, __VA_ARGS__)
+void sieve_global_info(struct sieve_instance *svinst,
+		       struct sieve_error_handler *ehandler,
+		       const char *csrc_filename,
+		       unsigned int csrc_linenum,
+		       const char *location, const char *fmt, ...)
+		       ATTR_FORMAT(6, 7);
+#define sieve_global_info(svinst, ehandler, ...) \
+	sieve_global_info(svinst, ehandler, __FILE__, __LINE__, __VA_ARGS__)
+void sieve_global_info_error(struct sieve_instance *svinst,
+			     struct sieve_error_handler *ehandler,
+			     const char *csrc_filename,
+			     unsigned int csrc_linenum,
+			     const char *location, const char *fmt, ...)
+			     ATTR_FORMAT(6, 7);
+#define sieve_global_info_error(svinst, ehandler, ...) \
+	sieve_global_info_error(svinst, ehandler, __FILE__, __LINE__, \
+				__VA_ARGS__)
+void sieve_global_info_warning(struct sieve_instance *svinst,
+			       struct sieve_error_handler *ehandler,
+			       const char *csrc_filename,
+			       unsigned int csrc_linenum,
+			       const char *location, const char *fmt, ...)
+			       ATTR_FORMAT(6, 7);
+#define sieve_global_info_warning(svinst, ehandler, ...) \
+	sieve_global_info_warning(svinst, ehandler, __FILE__, __LINE__, \
+				  __VA_ARGS__)
+
+/*
+ * Main (user) error functions
+ */
+
+/* For these functions it is the responsibility of the caller to
+ * manage the datastack.
+ */
+
+const char *
+sieve_error_script_location(const struct sieve_script *script,
+			    unsigned int source_line);
+
+void sieve_logv(struct sieve_error_handler *ehandler,
+		const struct sieve_error_params *params,
+		const char *fmt, va_list args) ATTR_FORMAT(3, 0);
+
+void sieve_event_logv(struct sieve_instance *svinst,
+		      struct sieve_error_handler *ehandler,
+		      struct event *event, enum log_type log_type,
+		      const char *csrc_filename, unsigned int csrc_linenum,
+		      const char *location, enum sieve_error_flags flags,
+		      const char *fmt, va_list args) ATTR_FORMAT(9, 0);
+void sieve_event_log(struct sieve_instance *svinst,
+		     struct sieve_error_handler *ehandler,
+		     struct event *event, enum log_type log_type,
+		     const char *csrc_filename, unsigned int csrc_linenum,
+		     const char *location, enum sieve_error_flags flags,
+		     const char *fmt, ...) ATTR_FORMAT(9, 10);
+#define sieve_event_log(svinst, ehandler, event, log_type, ...) \
+	sieve_event_log(svinst, ehandler, event, log_type, __FILE__, __LINE__, \
+			__VA_ARGS__)
+
+void sieve_criticalv(struct sieve_instance *svinst,
+		     struct sieve_error_handler *ehandler,
+		     const struct sieve_error_params *params,
+		     const char *user_prefix, const char *fmt, va_list args)
+		     ATTR_FORMAT(5, 0);
+
+void sieve_error(struct sieve_error_handler *ehandler,
+		 const char *csrc_filename, unsigned int csrc_linenum,
+		 const char *location, const char *fmt, ...) ATTR_FORMAT(5, 6);
+#define sieve_error(ehandler, ...) \
+	sieve_error(ehandler, __FILE__, __LINE__, __VA_ARGS__)
+void sieve_warning(struct sieve_error_handler *ehandler,
+		   const char *csrc_filename, unsigned int csrc_linenum,
+		   const char *location, const char *fmt, ...)
+		   ATTR_FORMAT(5, 6);
+#define sieve_warning(ehandler, ...) \
+	sieve_warning(ehandler, __FILE__, __LINE__, __VA_ARGS__)
+void sieve_info(struct sieve_error_handler *ehandler,
+		const char *csrc_filename, unsigned int csrc_linenum,
+		const char *location, const char *fmt, ...) ATTR_FORMAT(5, 6);
+#define sieve_info(ehandler, ...) \
+	sieve_info(ehandler, __FILE__, __LINE__, __VA_ARGS__)
+void sieve_debug(struct sieve_error_handler *ehandler,
+		 const char *csrc_filename, unsigned int csrc_linenum,
+		 const char *location, const char *fmt, ...) ATTR_FORMAT(5, 6);
+#define sieve_debug(ehandler, ...) \
+	sieve_debug(ehandler, __FILE__, __LINE__, __VA_ARGS__)
+void sieve_critical(struct sieve_instance *svinst,
+		    struct sieve_error_handler *ehandler,
+		    const char *csrc_filename, unsigned int csrc_linenum,
+		    const char *location, const char *user_prefix,
+		    const char *fmt, ...) ATTR_FORMAT(7, 8);
+#define sieve_critical(svinst, ehandler, ...) \
+	sieve_critical(svinst, ehandler, __FILE__, __LINE__, __VA_ARGS__)
+
+
+void sieve_internal_error_params(struct sieve_error_handler *ehandler,
+				 const struct sieve_error_params *params,
+				 const char *user_prefix);
+void sieve_internal_error(struct sieve_error_handler *ehandler,
+			  const char *csrc_filename, unsigned int csrc_linenum,
+			  const char *location, const char *user_prefix)
+			  ATTR_NULL(1, 4, 5);
+#define sieve_internal_error(ehandler, ...) \
+	sieve_internal_error(ehandler, __FILE__, __LINE__, __VA_ARGS__)
+
+/*
+ * Error handler configuration
+ */
+
+void sieve_error_handler_accept_infolog(struct sieve_error_handler *ehandler,
+					bool enable);
+void sieve_error_handler_accept_debuglog(struct sieve_error_handler *ehandler,
+					 bool enable);
+
+/*
+ * Error handler statistics
+ */
+
+unsigned int sieve_get_errors(struct sieve_error_handler *ehandler);
+unsigned int sieve_get_warnings(struct sieve_error_handler *ehandler);
+
+bool sieve_errors_more_allowed(struct sieve_error_handler *ehandler);
+
+/*
+ * Error handler object
+ */
+
+void sieve_error_handler_ref(struct sieve_error_handler *ehandler);
+void sieve_error_handler_unref(struct sieve_error_handler **ehandler);
+
+void sieve_error_handler_reset(struct sieve_error_handler *ehandler);
+
+/*
+ * Error handlers
+ */
+
+/* Write errors to dovecot master log */
+struct sieve_error_handler *
+sieve_master_ehandler_create(struct sieve_instance *svinst,
+			     unsigned int max_errors);
+
+/* Write errors to stderr */
+struct sieve_error_handler *
+sieve_stderr_ehandler_create(struct sieve_instance *svinst,
+			     unsigned int max_errors);
+
+/* Write errors into a string buffer */
+struct sieve_error_handler *
+sieve_strbuf_ehandler_create(struct sieve_instance *svinst, string_t *strbuf,
+			     bool crlf, unsigned int max_errors);
+
+/* Write errors to a logfile */
+struct sieve_error_handler *
+sieve_logfile_ehandler_create(struct sieve_instance *svinst,
+			      const char *logfile, unsigned int max_errors);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-execute.c b/pigeonhole/src/lib-sieve/sieve-execute.c
new file mode 100644
index 0000000..a395cc6
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-execute.c
@@ -0,0 +1,162 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+
+#include "sieve-execute.h"
+
+struct sieve_execute_state {
+	void *dup_trans;
+};
+
+struct event_category event_category_sieve_execute = {
+	.parent = &event_category_sieve,
+	.name = "sieve-execute",
+};
+
+static struct sieve_execute_state *
+sieve_execute_state_create(struct sieve_execute_env *eenv)
+{
+	return p_new(eenv->pool, struct sieve_execute_state, 1);
+}
+
+static void
+sieve_execute_state_free(struct sieve_execute_state **_estate,
+			 struct sieve_execute_env *eenv)
+{
+	struct sieve_execute_state *estate = *_estate;
+	const struct sieve_script_env *senv = eenv->scriptenv;
+
+	*_estate = NULL;
+
+	if (senv->duplicate_transaction_rollback != NULL)
+		senv->duplicate_transaction_rollback(&estate->dup_trans);
+}
+
+void sieve_execute_init(struct sieve_execute_env *eenv,
+			struct sieve_instance *svinst, pool_t pool,
+			const struct sieve_message_data *msgdata,
+			const struct sieve_script_env *senv,
+			enum sieve_execute_flags flags)
+{
+	i_zero(eenv);
+	eenv->svinst = svinst;
+	eenv->pool = pool;
+	eenv->flags = flags;
+	eenv->msgdata = msgdata;
+	eenv->scriptenv = senv;
+
+	pool_ref(pool);
+	eenv->event = event_create(svinst->event);
+	event_add_category(eenv->event, &event_category_sieve_execute);
+	event_add_str(eenv->event, "message_id", msgdata->id);
+	if ((flags & SIEVE_EXECUTE_FLAG_NO_ENVELOPE) == 0) {
+		/* Make sure important envelope fields are available */
+		event_add_str(eenv->event, "mail_from",
+			smtp_address_encode(msgdata->envelope.mail_from));
+		event_add_str(eenv->event, "rcpt_to",
+			smtp_address_encode(msgdata->envelope.rcpt_to));
+	}
+
+	eenv->state = sieve_execute_state_create(eenv);
+
+	eenv->exec_status = senv->exec_status;
+	if (eenv->exec_status == NULL)
+		eenv->exec_status = p_new(pool, struct sieve_exec_status, 1);
+	else
+		i_zero(eenv->exec_status);
+}
+
+void sieve_execute_finish(struct sieve_execute_env *eenv, int status)
+{
+	const struct sieve_script_env *senv = eenv->scriptenv;
+
+	if (status == SIEVE_EXEC_OK) {
+		if (senv->duplicate_transaction_commit != NULL) {
+			senv->duplicate_transaction_commit(
+				&eenv->state->dup_trans);
+		}
+	} else {
+		if (senv->duplicate_transaction_rollback != NULL) {
+			senv->duplicate_transaction_rollback(
+				&eenv->state->dup_trans);
+		}
+	}
+}
+
+void sieve_execute_deinit(struct sieve_execute_env *eenv)
+{
+	sieve_execute_state_free(&eenv->state, eenv);
+	event_unref(&eenv->event);
+	pool_unref(&eenv->pool);
+}
+
+/*
+ * Checking for duplicates
+ */
+
+static void *
+sieve_execute_get_dup_transaction(const struct sieve_execute_env *eenv)
+{
+	const struct sieve_script_env *senv = eenv->scriptenv;
+
+	if (senv->duplicate_transaction_begin == NULL)
+		return NULL;
+	if (eenv->state->dup_trans == NULL) {
+		eenv->state->dup_trans =
+			senv->duplicate_transaction_begin(senv);
+	}
+	return eenv->state->dup_trans;
+}
+
+bool sieve_execute_duplicate_check_available(
+	const struct sieve_execute_env *eenv)
+{
+	const struct sieve_script_env *senv = eenv->scriptenv;
+
+	return (senv->duplicate_transaction_begin != NULL);
+}
+
+int sieve_execute_duplicate_check(const struct sieve_execute_env *eenv,
+				  const void *id, size_t id_size,
+				  bool *duplicate_r)
+{
+	const struct sieve_script_env *senv = eenv->scriptenv;
+	void *dup_trans = sieve_execute_get_dup_transaction(eenv);
+	int ret;
+
+	*duplicate_r = FALSE;
+
+	if (senv->duplicate_check == NULL)
+		return SIEVE_EXEC_OK;
+
+	e_debug(eenv->svinst->event, "Check duplicate ID");
+
+	ret = senv->duplicate_check(dup_trans, senv, id, id_size);
+	switch (ret) {
+	case SIEVE_DUPLICATE_CHECK_RESULT_EXISTS:
+		*duplicate_r = TRUE;
+		break;
+	case SIEVE_DUPLICATE_CHECK_RESULT_NOT_FOUND:
+		break;
+	case SIEVE_DUPLICATE_CHECK_RESULT_FAILURE:
+		return SIEVE_EXEC_FAILURE;
+	case SIEVE_DUPLICATE_CHECK_RESULT_TEMP_FAILURE:
+		return SIEVE_EXEC_TEMP_FAILURE;
+	}
+	return SIEVE_EXEC_OK;
+}
+
+void sieve_execute_duplicate_mark(const struct sieve_execute_env *eenv,
+				  const void *id, size_t id_size, time_t time)
+{
+	const struct sieve_script_env *senv = eenv->scriptenv;
+	void *dup_trans = sieve_execute_get_dup_transaction(eenv);
+
+	if (senv->duplicate_mark == NULL)
+		return;
+
+	e_debug(eenv->svinst->event, "Mark ID as duplicate");
+
+	senv->duplicate_mark(dup_trans, senv, id, id_size, time);
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-execute.h b/pigeonhole/src/lib-sieve/sieve-execute.h
new file mode 100644
index 0000000..8af182b
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-execute.h
@@ -0,0 +1,42 @@
+#ifndef SIEVE_EXECUTE_H
+#define SIEVE_EXECUTE_H
+
+#include "sieve-common.h"
+
+struct sieve_execute_state;
+
+struct sieve_execute_env {
+	struct sieve_instance *svinst;
+	pool_t pool;
+
+	enum sieve_execute_flags flags;
+	struct event *event;
+
+	const struct sieve_message_data *msgdata;
+	const struct sieve_script_env *scriptenv;
+
+	struct sieve_execute_state *state;
+	struct sieve_exec_status *exec_status;
+};
+
+void sieve_execute_init(struct sieve_execute_env *eenv,
+			struct sieve_instance *svinst, pool_t pool,
+			const struct sieve_message_data *msgdata,
+			const struct sieve_script_env *senv,
+			enum sieve_execute_flags flags);
+void sieve_execute_finish(struct sieve_execute_env *eenv, int status);
+void sieve_execute_deinit(struct sieve_execute_env *eenv);
+
+/*
+ * Checking for duplicates
+ */
+
+bool sieve_execute_duplicate_check_available(
+	const struct sieve_execute_env *eenv);
+int sieve_execute_duplicate_check(const struct sieve_execute_env *eenv,
+				  const void *id, size_t id_size,
+				  bool *duplicate_r);
+void sieve_execute_duplicate_mark(const struct sieve_execute_env *eenv,
+				  const void *id, size_t id_size, time_t time);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-extensions.c b/pigeonhole/src/lib-sieve/sieve-extensions.c
new file mode 100644
index 0000000..a1cb810
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-extensions.c
@@ -0,0 +1,879 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "mempool.h"
+#include "hash.h"
+#include "array.h"
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+#include "sieve-settings.h"
+#include "sieve-extensions.h"
+
+/*
+ * Forward declarations
+ */
+
+static void sieve_extension_registry_init(struct sieve_instance *svinst);
+static void sieve_extension_registry_deinit(struct sieve_instance *svinst);
+
+static void sieve_capability_registry_init(struct sieve_instance *svinst);
+static void sieve_capability_registry_deinit(struct sieve_instance *svinst);
+
+static struct sieve_extension *_sieve_extension_register
+	(struct sieve_instance *svinst, const struct sieve_extension_def *extdef,
+		bool load, bool required);
+
+/*
+ * Instance global context
+ */
+
+struct sieve_extension_registry {
+	ARRAY(struct sieve_extension *) extensions;
+	HASH_TABLE(const char *, struct sieve_extension *) extension_index;
+	HASH_TABLE(const char *, struct sieve_capability_registration *) capabilities_index;
+
+	/* Core language 'extensions' */
+	const struct sieve_extension *comparator_extension;
+	const struct sieve_extension *match_type_extension;
+	const struct sieve_extension *address_part_extension;
+
+	/* Preloaded extensions */
+	ARRAY(const struct sieve_extension *) preloaded_extensions;
+};
+
+/*
+ * Pre-loaded 'extensions'
+ */
+
+extern const struct sieve_extension_def comparator_extension;
+extern const struct sieve_extension_def match_type_extension;
+extern const struct sieve_extension_def address_part_extension;
+
+/*
+ * Dummy extensions
+ */
+
+/* FIXME: This is stupid. Define a comparator-* extension and be done with it */
+
+const struct sieve_extension_def comparator_i_octet_extension = {
+	.name = "comparator-i;octet",
+};
+
+const struct sieve_extension_def comparator_i_ascii_casemap_extension = {
+	.name = "comparator-i;ascii-casemap",
+};
+
+/*
+ * List of native extensions
+ */
+
+/* Dummy extensions */
+
+extern const struct sieve_extension_def comparator_i_octet_extension;
+extern const struct sieve_extension_def comparator_i_ascii_casemap_extension;
+
+const struct sieve_extension_def *sieve_dummy_extensions[] = {
+	&comparator_i_octet_extension, &comparator_i_ascii_casemap_extension
+};
+
+const unsigned int sieve_dummy_extensions_count =
+	N_ELEMENTS(sieve_dummy_extensions);
+
+/* Core */
+
+extern const struct sieve_extension_def fileinto_extension;
+extern const struct sieve_extension_def reject_extension;
+extern const struct sieve_extension_def envelope_extension;
+extern const struct sieve_extension_def encoded_character_extension;
+
+extern const struct sieve_extension_def vacation_extension;
+extern const struct sieve_extension_def subaddress_extension;
+extern const struct sieve_extension_def comparator_i_ascii_numeric_extension;
+extern const struct sieve_extension_def relational_extension;
+extern const struct sieve_extension_def regex_extension;
+extern const struct sieve_extension_def imap4flags_extension;
+extern const struct sieve_extension_def copy_extension;
+extern const struct sieve_extension_def include_extension;
+extern const struct sieve_extension_def body_extension;
+extern const struct sieve_extension_def variables_extension;
+extern const struct sieve_extension_def enotify_extension;
+extern const struct sieve_extension_def environment_extension;
+extern const struct sieve_extension_def mailbox_extension;
+extern const struct sieve_extension_def date_extension;
+extern const struct sieve_extension_def index_extension;
+extern const struct sieve_extension_def ihave_extension;
+extern const struct sieve_extension_def duplicate_extension;
+extern const struct sieve_extension_def mime_extension;
+extern const struct sieve_extension_def foreverypart_extension;
+extern const struct sieve_extension_def extracttext_extension;
+extern const struct sieve_extension_def mboxmetadata_extension;
+extern const struct sieve_extension_def servermetadata_extension;
+
+const struct sieve_extension_def *sieve_core_extensions[] = {
+	/* Core extensions */
+	&fileinto_extension, &reject_extension, &envelope_extension,
+	&encoded_character_extension,
+
+	/* 'Plugins' */
+	&vacation_extension, &subaddress_extension,
+	&comparator_i_ascii_numeric_extension,
+	&relational_extension, &regex_extension, &imap4flags_extension,
+	&copy_extension, &include_extension, &body_extension,
+	&variables_extension, &enotify_extension, &environment_extension,
+	&mailbox_extension, &date_extension, &index_extension, &ihave_extension,
+	&duplicate_extension, &mime_extension, &foreverypart_extension,
+	&extracttext_extension
+};
+
+const unsigned int sieve_core_extensions_count =
+	N_ELEMENTS(sieve_core_extensions);
+
+/* Extra;
+ *   These are not enabled by default, e.g. because explicit configuration is
+ *   necessary to make these useful.
+ */
+
+extern const struct sieve_extension_def vacation_seconds_extension;
+extern const struct sieve_extension_def spamtest_extension;
+extern const struct sieve_extension_def spamtestplus_extension;
+extern const struct sieve_extension_def virustest_extension;
+extern const struct sieve_extension_def editheader_extension;
+extern const struct sieve_extension_def special_use_extension;
+
+extern const struct sieve_extension_def vnd_debug_extension;
+extern const struct sieve_extension_def vnd_environment_extension;
+extern const struct sieve_extension_def vnd_report_extension;
+
+const struct sieve_extension_def *sieve_extra_extensions[] = {
+	&vacation_seconds_extension, &spamtest_extension, &spamtestplus_extension,
+	&virustest_extension, &editheader_extension,
+	&mboxmetadata_extension, &servermetadata_extension,
+	&special_use_extension,
+
+	/* vnd.dovecot. */
+	&vnd_debug_extension, &vnd_environment_extension, &vnd_report_extension
+};
+
+const unsigned int sieve_extra_extensions_count =
+	N_ELEMENTS(sieve_extra_extensions);
+
+/*
+ * Deprecated extensions
+ */
+
+extern const struct sieve_extension_def imapflags_extension;
+extern const struct sieve_extension_def notify_extension;
+extern const struct sieve_extension_def vnd_duplicate_extension;
+
+const struct sieve_extension_def *sieve_deprecated_extensions[] = {
+	&imapflags_extension,
+	&notify_extension,
+	&vnd_duplicate_extension
+};
+
+const unsigned int sieve_deprecated_extensions_count =
+	N_ELEMENTS(sieve_deprecated_extensions);
+
+/*
+ * Unfinished extensions
+ */
+
+#ifdef HAVE_SIEVE_UNFINISHED
+
+extern const struct sieve_extension_def ereject_extension;
+
+const struct sieve_extension_def *sieve_unfinished_extensions[] = {
+	&ereject_extension
+};
+
+const unsigned int sieve_unfinished_extensions_count =
+	N_ELEMENTS(sieve_unfinished_extensions);
+
+#endif /* HAVE_SIEVE_UNFINISHED */
+
+/*
+ * Extensions init/deinit
+ */
+
+bool sieve_extensions_init(struct sieve_instance *svinst)
+{
+	unsigned int i;
+	struct sieve_extension_registry *ext_reg =
+		p_new(svinst->pool, struct sieve_extension_registry, 1);
+	struct sieve_extension *ext;
+
+	svinst->ext_reg = ext_reg;
+
+	sieve_extension_registry_init(svinst);
+	sieve_capability_registry_init(svinst);
+
+	/* Preloaded 'extensions' */
+	ext_reg->comparator_extension =
+		sieve_extension_register(svinst, &comparator_extension, TRUE);
+	ext_reg->match_type_extension =
+		sieve_extension_register(svinst, &match_type_extension, TRUE);
+	ext_reg->address_part_extension =
+		sieve_extension_register(svinst, &address_part_extension, TRUE);
+
+	p_array_init(&ext_reg->preloaded_extensions, svinst->pool, 5);
+	array_append(&ext_reg->preloaded_extensions,
+		&ext_reg->comparator_extension, 1);
+	array_append(&ext_reg->preloaded_extensions,
+		&ext_reg->match_type_extension, 1);
+	array_append(&ext_reg->preloaded_extensions,
+		&ext_reg->address_part_extension, 1);
+
+	/* Pre-load dummy extensions */
+	for ( i = 0; i < sieve_dummy_extensions_count; i++ ) {
+		if ( (ext=_sieve_extension_register
+			(svinst, sieve_dummy_extensions[i], TRUE, FALSE)) == NULL )
+			return FALSE;
+
+		ext->dummy = TRUE;
+	}
+
+	/* Pre-load core extensions */
+	for ( i = 0; i < sieve_core_extensions_count; i++ ) {
+		if ( sieve_extension_register
+			(svinst, sieve_core_extensions[i], TRUE) == NULL )
+			return FALSE;
+	}
+
+	/* Pre-load extra extensions */
+	for ( i = 0; i < sieve_extra_extensions_count; i++ ) {
+		if ( sieve_extension_register
+			(svinst, sieve_extra_extensions[i], FALSE) == NULL )
+			return FALSE;
+	}
+
+	/* Register deprecated extensions */
+	for ( i = 0; i < sieve_deprecated_extensions_count; i++ ) {
+		if ( sieve_extension_register
+			(svinst, sieve_deprecated_extensions[i], FALSE) == NULL )
+			return FALSE;
+	}
+
+#ifdef HAVE_SIEVE_UNFINISHED
+	/* Register unfinished extensions */
+	for ( i = 0; i < sieve_unfinished_extensions_count; i++ ) {
+		if ( sieve_extension_register
+			(svinst, sieve_unfinished_extensions[i], FALSE) == NULL )
+			return FALSE;
+	}
+#endif
+
+	/* More extensions can be added through plugins */
+
+	return TRUE;
+}
+
+void sieve_extensions_configure(struct sieve_instance *svinst)
+{
+	const char *extensions;
+
+	/* Apply sieve_extensions configuration */
+
+	if ( (extensions=sieve_setting_get
+		(svinst, "sieve_extensions")) != NULL )
+		sieve_extensions_set_string(svinst, extensions, FALSE, FALSE);
+
+	/* Apply sieve_global_extensions configuration */
+
+	if ( (extensions=sieve_setting_get
+		(svinst, "sieve_global_extensions")) != NULL )
+		sieve_extensions_set_string(svinst, extensions, TRUE, FALSE);
+
+	/* Apply sieve_implicit_extensions configuration */
+
+	if ( (extensions=sieve_setting_get
+		(svinst, "sieve_implicit_extensions")) != NULL )
+		sieve_extensions_set_string(svinst, extensions, FALSE, TRUE);
+}
+
+void sieve_extensions_deinit(struct sieve_instance *svinst)
+{
+	sieve_extension_registry_deinit(svinst);
+	sieve_capability_registry_deinit(svinst);
+}
+
+/*
+ * Pre-loaded extensions
+ */
+
+const struct sieve_extension *const *sieve_extensions_get_preloaded
+(struct sieve_instance *svinst, unsigned int *count_r)
+{
+	struct sieve_extension_registry *ext_reg = svinst->ext_reg;
+
+	return array_get(&ext_reg->preloaded_extensions, count_r);
+}
+
+/*
+ * Extension registry
+ */
+
+static bool _sieve_extension_load(struct sieve_extension *ext)
+{
+	/* Call load handler */
+	if ( ext->def != NULL && ext->def->load != NULL &&
+		!ext->def->load(ext, &ext->context) ) {
+		e_error(ext->svinst->event,
+			"failed to load '%s' extension support.",
+			ext->def->name);
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+static void _sieve_extension_unload(struct sieve_extension *ext)
+{
+	/* Call unload handler */
+	if ( ext->def != NULL && ext->def->unload != NULL )
+		ext->def->unload(ext);
+	ext->context = NULL;
+}
+
+static void sieve_extension_registry_init(struct sieve_instance *svinst)
+{
+	struct sieve_extension_registry *ext_reg = svinst->ext_reg;
+
+	p_array_init(&ext_reg->extensions, svinst->pool, 50);
+	hash_table_create
+		(&ext_reg->extension_index, default_pool, 0, str_hash, strcmp);
+}
+
+static void sieve_extension_registry_deinit(struct sieve_instance *svinst)
+{
+	struct sieve_extension_registry *ext_reg = svinst->ext_reg;
+	struct sieve_extension * const *exts;
+    unsigned int i, ext_count;
+
+	if ( !hash_table_is_created(ext_reg->extension_index) ) return;
+
+    exts = array_get_modifiable(&ext_reg->extensions, &ext_count);
+	for ( i = 0; i < ext_count; i++ ) {
+		_sieve_extension_unload(exts[i]);
+	}
+
+	hash_table_destroy(&ext_reg->extension_index);
+}
+
+bool sieve_extension_reload(const struct sieve_extension *ext)
+{
+	struct sieve_extension_registry *ext_reg = ext->svinst->ext_reg;
+	struct sieve_extension * const *mod_ext;
+	int ext_id = ext->id;
+
+	/* Let's not just cast the 'const' away */
+	if ( ext_id >= 0 && ext_id < (int) array_count(&ext_reg->extensions) ) {
+		mod_ext = array_idx(&ext_reg->extensions, ext_id);
+
+		return _sieve_extension_load(*mod_ext);
+	}
+
+	return FALSE;
+}
+
+static struct sieve_extension *sieve_extension_lookup
+(struct sieve_instance *svinst, const char *name)
+{
+	struct sieve_extension_registry *ext_reg = svinst->ext_reg;
+
+	return 	hash_table_lookup(ext_reg->extension_index, name);
+}
+
+static struct sieve_extension *sieve_extension_alloc
+(struct sieve_instance *svinst,
+	const struct sieve_extension_def *extdef)
+{
+	struct sieve_extension_registry *ext_reg = svinst->ext_reg;
+	struct sieve_extension *ext, **extr;
+	int ext_id;
+
+	ext_id = (int)array_count(&ext_reg->extensions);
+
+	/* Add extension to the registry */
+	extr = array_append_space(&ext_reg->extensions);
+	*extr = ext = p_new(svinst->pool, struct sieve_extension, 1);
+	ext->id = ext_id;
+	ext->def = extdef;
+	ext->svinst = svinst;
+	return ext;
+}
+
+static struct sieve_extension *_sieve_extension_register
+(struct sieve_instance *svinst, const struct sieve_extension_def *extdef,
+	bool load, bool required)
+{
+	struct sieve_extension *ext;
+
+	ext = sieve_extension_lookup(svinst, extdef->name);
+
+	/* Register extension if it is not registered already */
+	if ( ext == NULL ) {
+		ext = sieve_extension_alloc(svinst, extdef);
+		hash_table_insert
+			(svinst->ext_reg->extension_index, extdef->name, ext);
+
+	} else if ( ext->overridden ) {
+		/* Create a dummy */
+		ext = sieve_extension_alloc(svinst, extdef);
+
+	} else {
+		/* Re-register it if it were previously unregistered
+		 * (not going to happen)
+		 */
+		i_assert( ext->def == NULL || ext->def == extdef );
+		ext->def = extdef;
+	}
+
+	/* Enable extension */
+	if ( load || required ) {
+		ext->enabled = ( ext->enabled || load );
+
+		/* Call load handler if extension was not loaded already */
+		if ( !ext->loaded ) {
+			if ( !_sieve_extension_load(ext) )
+				return NULL;
+		}
+
+		ext->loaded = TRUE;
+	}
+
+	ext->required = ( ext->required || required );
+
+	return ext;
+}
+
+const struct sieve_extension *sieve_extension_register
+(struct sieve_instance *svinst, const struct sieve_extension_def *extdef,
+	bool load)
+{
+	return _sieve_extension_register(svinst, extdef, load, FALSE);
+}
+
+void sieve_extension_unregister(const struct sieve_extension *ext)
+{
+	struct sieve_extension_registry *ext_reg = ext->svinst->ext_reg;
+	struct sieve_extension * const *mod_ext;
+	int ext_id = ext->id;
+
+	if ( ext_id >= 0 && ext_id < (int) array_count(&ext_reg->extensions) ) {
+		mod_ext = array_idx(&ext_reg->extensions, ext_id);
+
+		sieve_extension_capabilities_unregister(*mod_ext);
+		_sieve_extension_unload(*mod_ext);
+		(*mod_ext)->loaded = FALSE;
+		(*mod_ext)->enabled = FALSE;
+		(*mod_ext)->def = NULL;
+	}
+}
+
+const struct sieve_extension *sieve_extension_replace
+(struct sieve_instance *svinst, const struct sieve_extension_def *extdef,
+	bool load)
+{
+	struct sieve_extension *ext;
+
+	ext = sieve_extension_lookup(svinst, extdef->name);
+	if (ext != NULL)
+		sieve_extension_unregister(ext);
+	return sieve_extension_register(svinst, extdef, load);
+}
+
+const struct sieve_extension *sieve_extension_require
+(struct sieve_instance *svinst, const struct sieve_extension_def *extdef,
+	bool load)
+{
+	return _sieve_extension_register(svinst, extdef, load, TRUE);
+}
+
+void sieve_extension_override
+(struct sieve_instance *svinst, const char *name,
+	const struct sieve_extension *ext)
+{
+	struct sieve_extension_registry *ext_reg = ext->svinst->ext_reg;
+	struct sieve_extension * const *mod_ext;
+	struct sieve_extension *old_ext;
+
+	old_ext = sieve_extension_lookup(svinst, name);
+	if (old_ext == ext)
+		return;
+	i_assert( old_ext == NULL || !old_ext->overridden );
+
+	i_assert( ext->id >= 0 &&
+		ext->id < (int) array_count(&ext_reg->extensions) );
+	mod_ext = array_idx(&ext_reg->extensions, ext->id);
+
+	hash_table_update
+		(ext_reg->extension_index, name, *mod_ext);
+	if ( old_ext != NULL )
+		old_ext->overridden = TRUE;
+}
+
+unsigned int sieve_extensions_get_count(struct sieve_instance *svinst)
+{
+	struct sieve_extension_registry *ext_reg = svinst->ext_reg;
+
+	return array_count(&ext_reg->extensions);
+}
+
+const struct sieve_extension *const *
+sieve_extensions_get_all(struct sieve_instance *svinst,
+	unsigned int *count_r)
+{
+	struct sieve_extension_registry *ext_reg = svinst->ext_reg;
+
+	return (const struct sieve_extension *const *)
+		array_get(&ext_reg->extensions, count_r);
+}
+
+const struct sieve_extension *sieve_extension_get_by_id
+(struct sieve_instance *svinst, unsigned int ext_id)
+{
+	struct sieve_extension_registry *ext_reg = svinst->ext_reg;
+	struct sieve_extension * const *ext;
+
+	if ( ext_id < array_count(&ext_reg->extensions) ) {
+		ext = array_idx(&ext_reg->extensions, ext_id);
+
+		if ( (*ext)->def != NULL && ((*ext)->enabled || (*ext)->required) )
+			return *ext;
+	}
+
+	return NULL;
+}
+
+const struct sieve_extension *sieve_extension_get_by_name
+(struct sieve_instance *svinst, const char *name)
+{
+	const struct sieve_extension *ext;
+
+	if ( *name == '@' )
+		return NULL;
+
+	if ( strlen(name) > 128 )
+		return NULL;
+
+	ext = sieve_extension_lookup(svinst, name);
+	if ( ext == NULL || ext->def == NULL || (!ext->enabled && !ext->required))
+		return NULL;
+
+	return ext;
+}
+
+static inline bool _sieve_extension_listable(const struct sieve_extension *ext)
+{
+	return ( ext->enabled && ext->def != NULL && *(ext->def->name) != '@'
+		&& !ext->dummy && !ext->global && !ext->overridden);
+}
+
+const char *sieve_extensions_get_string(struct sieve_instance *svinst)
+{
+	struct sieve_extension_registry *ext_reg = svinst->ext_reg;
+	string_t *extstr = t_str_new(256);
+	struct sieve_extension * const *exts;
+	unsigned int i, ext_count;
+
+	exts = array_get(&ext_reg->extensions, &ext_count);
+
+	if ( ext_count > 0 ) {
+		i = 0;
+
+		/* Find first listable extension */
+		while ( i < ext_count && !_sieve_extension_listable(exts[i]) )
+			i++;
+
+		if ( i < ext_count ) {
+			/* Add first to string */
+			str_append(extstr, exts[i]->def->name);
+			i++;
+
+	 		/* Add others */
+			for ( ; i < ext_count; i++ ) {
+				if ( _sieve_extension_listable(exts[i]) ) {
+					str_append_c(extstr, ' ');
+					str_append(extstr, exts[i]->def->name);
+				}
+			}
+		}
+	}
+
+	return str_c(extstr);
+}
+
+static void sieve_extension_set_enabled
+(struct sieve_extension *ext, bool enabled)
+{
+	if ( enabled ) {
+		ext->enabled = TRUE;
+
+		if ( !ext->loaded ) {
+			(void)_sieve_extension_load(ext);
+		}
+
+		ext->loaded = TRUE;
+	} else {
+		ext->enabled = FALSE;
+	}
+}
+
+static void sieve_extension_set_global
+(struct sieve_extension *ext, bool enabled)
+{
+	if ( enabled ) {
+		sieve_extension_set_enabled(ext, TRUE);
+		ext->global = TRUE;
+	} else {
+		ext->global = FALSE;
+	}
+}
+
+static void sieve_extension_set_implicit
+(struct sieve_extension *ext, bool enabled)
+{
+	if ( enabled ) {
+		sieve_extension_set_enabled(ext, TRUE);
+		ext->implicit = TRUE;
+	} else {
+		ext->implicit = FALSE;
+	}
+}
+
+void sieve_extensions_set_string
+(struct sieve_instance *svinst, const char *ext_string,
+	bool global, bool implicit)
+{
+	struct sieve_extension_registry *ext_reg = svinst->ext_reg;
+	ARRAY(const struct sieve_extension *) enabled_extensions;
+	ARRAY(const struct sieve_extension *) disabled_extensions;
+	const struct sieve_extension *const *ext_enabled;
+	const struct sieve_extension *const *ext_disabled;
+	struct sieve_extension **exts;
+	const char **ext_names;
+	unsigned int i, ext_count, ena_count, dis_count;
+	bool relative = FALSE;
+
+	if ( ext_string == NULL ) {
+		if ( global || implicit ) return;
+
+		/* Enable all */
+		exts = array_get_modifiable(&ext_reg->extensions, &ext_count);
+
+		for ( i = 0; i < ext_count; i++ )
+			sieve_extension_set_enabled(exts[i], TRUE);
+
+		return;
+	}
+
+	T_BEGIN {
+		t_array_init(&enabled_extensions, array_count(&ext_reg->extensions));
+		t_array_init(&disabled_extensions, array_count(&ext_reg->extensions));
+
+		ext_names = t_strsplit_spaces(ext_string, " \t");
+
+		while ( *ext_names != NULL ) {
+			const char *name = *ext_names;
+
+			ext_names++;
+
+			if ( *name != '\0' ) {
+				const struct sieve_extension *ext;
+				char op = '\0'; /* No add/remove operation */
+
+				if ( *name == '+' 		/* Add to existing config */
+					|| *name == '-' ) {	/* Remove from existing config */
+				 	op = *name++;
+				 	relative = TRUE;
+				}
+
+				if ( *name == '@' )
+					ext = NULL;
+				else
+					ext = hash_table_lookup(ext_reg->extension_index, name);
+
+				if ( ext == NULL || ext->def == NULL ) {
+					e_warning(svinst->event,
+						  "ignored unknown extension '%s' while configuring "
+						  "available extensions", name);
+					continue;
+				}
+
+				if ( op == '-' )
+					array_append(&disabled_extensions, &ext, 1);
+				else
+					array_append(&enabled_extensions, &ext, 1);
+			}
+		}
+
+		exts = array_get_modifiable(&ext_reg->extensions, &ext_count);
+		ext_enabled = array_get(&enabled_extensions, &ena_count);
+		ext_disabled = array_get(&disabled_extensions, &dis_count);
+
+		/* Set new extension status */
+
+		for ( i = 0; i < ext_count; i++ ) {
+			unsigned int j;
+			bool enabled = FALSE;
+
+			if ( exts[i]->id < 0 || exts[i]->def == NULL ||
+				*(exts[i]->def->name) == '@' ) {
+				continue;
+			}
+
+			/* If extensions are specified relative to the default set,
+			 * we first need to check which ones are disabled
+			 */
+
+			if ( relative ) {
+				if ( global )
+					enabled = exts[i]->global;
+				else if ( implicit )
+					enabled = exts[i]->implicit;
+				else
+					enabled = exts[i]->enabled;
+
+				if ( enabled ) {
+					/* Disable if explicitly disabled */
+					for ( j = 0; j < dis_count; j++ ) {
+						if ( ext_disabled[j]->def == exts[i]->def ) {
+							enabled = FALSE;
+							break;
+						}
+					}
+				}
+			}
+
+			/* Enable if listed with '+' or no prefix */
+
+			for ( j = 0; j < ena_count; j++ ) {
+				if ( ext_enabled[j]->def == exts[i]->def ) {
+					enabled = TRUE;
+					break;
+				}
+			}
+
+			/* Perform actual activation/deactivation */
+			if ( global ) {
+				sieve_extension_set_global(exts[i], enabled);
+			} else if ( implicit ) {
+				sieve_extension_set_implicit(exts[i], enabled);
+			} else {
+				sieve_extension_set_enabled(exts[i], enabled);
+			}
+		}
+	} T_END;
+}
+
+const struct sieve_extension *sieve_get_match_type_extension
+	(struct sieve_instance *svinst)
+{
+	return svinst->ext_reg->match_type_extension;
+}
+
+const struct sieve_extension *sieve_get_comparator_extension
+	(struct sieve_instance *svinst)
+{
+	return svinst->ext_reg->comparator_extension;
+}
+
+const struct sieve_extension *sieve_get_address_part_extension
+	(struct sieve_instance *svinst)
+{
+	return svinst->ext_reg->address_part_extension;
+}
+
+void sieve_enable_debug_extension(struct sieve_instance *svinst)
+{
+	(void) sieve_extension_register(svinst, &vnd_debug_extension, TRUE);
+}
+
+/*
+ * Extension capabilities
+ */
+
+struct sieve_capability_registration {
+	const struct sieve_extension *ext;
+	const struct sieve_extension_capabilities *capabilities;
+};
+
+void sieve_capability_registry_init(struct sieve_instance *svinst)
+{
+	struct sieve_extension_registry *ext_reg = svinst->ext_reg;
+
+	hash_table_create
+		(&ext_reg->capabilities_index, default_pool, 0, str_hash, strcmp);
+}
+
+void sieve_capability_registry_deinit(struct sieve_instance *svinst)
+{
+	struct sieve_extension_registry *ext_reg = svinst->ext_reg;
+
+	if ( !hash_table_is_created(ext_reg->capabilities_index) ) return;
+
+	hash_table_destroy(&svinst->ext_reg->capabilities_index);
+}
+
+void sieve_extension_capabilities_register
+(const struct sieve_extension *ext,
+	const struct sieve_extension_capabilities *cap)
+{
+	struct sieve_instance *svinst = ext->svinst;
+	struct sieve_extension_registry *ext_reg = svinst->ext_reg;
+	struct sieve_capability_registration *reg;
+
+	reg = hash_table_lookup(ext_reg->capabilities_index, cap->name);
+	if (reg != NULL) {
+		/* Already registered */
+		return;
+	}
+
+	reg = p_new(svinst->pool, struct sieve_capability_registration, 1);
+	reg->ext = ext;
+	reg->capabilities = cap;
+
+	hash_table_insert(ext_reg->capabilities_index, cap->name, reg);
+}
+
+void sieve_extension_capabilities_unregister
+(const struct sieve_extension *ext)
+{
+	struct sieve_extension_registry *ext_reg = ext->svinst->ext_reg;
+	struct hash_iterate_context *hictx;
+	const char *name;
+	struct sieve_capability_registration *reg;
+
+	hictx = hash_table_iterate_init(ext_reg->capabilities_index);
+	while ( hash_table_iterate(hictx, ext_reg->capabilities_index, &name, &reg) ) {
+		if ( reg->ext == ext )
+			hash_table_remove(ext_reg->capabilities_index, name);
+	}
+	hash_table_iterate_deinit(&hictx);
+}
+
+const char *sieve_extension_capabilities_get_string
+(struct sieve_instance *svinst, const char *cap_name)
+{
+	struct sieve_extension_registry *ext_reg = svinst->ext_reg;
+	const struct sieve_capability_registration *cap_reg =
+		hash_table_lookup(ext_reg->capabilities_index, cap_name);
+	const struct sieve_extension_capabilities *cap;
+
+	if ( cap_reg == NULL || cap_reg->capabilities == NULL )
+		return NULL;
+
+	cap = cap_reg->capabilities;
+
+	if ( cap->get_string == NULL || !cap_reg->ext->enabled )
+		return NULL;
+
+	return cap->get_string(cap_reg->ext);
+}
+
+
+
+
diff --git a/pigeonhole/src/lib-sieve/sieve-extensions.h b/pigeonhole/src/lib-sieve/sieve-extensions.h
new file mode 100644
index 0000000..961cf41
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-extensions.h
@@ -0,0 +1,191 @@
+#ifndef SIEVE_EXTENSIONS_H
+#define SIEVE_EXTENSIONS_H
+
+#include "lib.h"
+#include "sieve-common.h"
+
+/*
+ * Per-extension object registry
+ */
+
+struct sieve_extension_objects {
+	const void *objects;
+	unsigned int count;
+};
+
+/*
+ * Extension definition
+ */
+
+struct sieve_extension_def {
+	const char *name;
+
+	/* Version */
+	unsigned int version;
+
+	/* Registration */
+	bool (*load)(const struct sieve_extension *ext, void **context);
+	void (*unload)(const struct sieve_extension *ext);
+
+	/* Compilation */
+	bool (*validator_load)
+		(const struct sieve_extension *ext, struct sieve_validator *validator);
+	bool (*generator_load)
+		(const struct sieve_extension *ext, const struct sieve_codegen_env *cgenv);
+	bool (*interpreter_load)
+		(const struct sieve_extension *ext, const struct sieve_runtime_env *renv,
+			sieve_size_t *address);
+	bool (*binary_load)
+		(const struct sieve_extension *ext, struct sieve_binary *binary);
+
+	/* Code dump */
+	bool (*binary_dump)
+		(const struct sieve_extension *ext, struct sieve_dumptime_env *denv);
+	bool (*code_dump)
+		(const struct sieve_extension *ext, const struct sieve_dumptime_env *denv,
+			sieve_size_t *address);
+
+	/* Objects */
+	struct sieve_extension_objects operations;
+	struct sieve_extension_objects operands;
+};
+
+/* Defining opcodes and operands */
+
+#define SIEVE_EXT_DEFINE_NO_OBJECTS \
+	{ NULL, 0 }
+#define SIEVE_EXT_DEFINE_OBJECT(OBJ) \
+	{ &OBJ, 1 }
+#define SIEVE_EXT_DEFINE_OBJECTS(OBJS) \
+	{ OBJS, N_ELEMENTS(OBJS) }
+
+#define SIEVE_EXT_GET_OBJECTS_COUNT(ext, field) \
+	ext->field->count;
+
+#define SIEVE_EXT_DEFINE_NO_OPERATIONS \
+	.operations = SIEVE_EXT_DEFINE_NO_OBJECTS
+#define SIEVE_EXT_DEFINE_OPERATION(OP) \
+	.operations = SIEVE_EXT_DEFINE_OBJECT(OP)
+#define SIEVE_EXT_DEFINE_OPERATIONS(OPS) \
+	.operations = SIEVE_EXT_DEFINE_OBJECTS(OPS)
+
+#define SIEVE_EXT_DEFINE_NO_OPERANDS \
+	.operands = SIEVE_EXT_DEFINE_NO_OBJECTS
+#define SIEVE_EXT_DEFINE_OPERAND(OP) \
+	.operands = SIEVE_EXT_DEFINE_OBJECT(OP)
+#define SIEVE_EXT_DEFINE_OPERANDS(OPS) \
+	.operands = SIEVE_EXT_DEFINE_OBJECTS(OPS)
+
+/*
+ * Extension instance
+ */
+
+struct sieve_extension {
+	const struct sieve_extension_def *def;
+	int id;
+
+	struct sieve_instance *svinst;
+	void *context;
+
+	bool required:1;
+	bool loaded:1;
+	bool enabled:1;
+	bool dummy:1;
+	bool global:1;
+	bool implicit:1;
+	bool overridden:1;
+};
+
+#define sieve_extension_is(ext, definition) \
+	( (ext)->def == &(definition) )
+#define sieve_extension_name(ext) \
+	((ext)->def->name)
+#define sieve_extension_name_is(ext, _name) \
+	( strcmp((ext)->def->name, (_name)) == 0 )
+#define sieve_extension_version(ext) \
+	((ext)->def->version)
+#define sieve_extension_version_is(ext, _version) \
+	((ext)->def->version == (_version))
+
+/*
+ * Extensions init/deinit
+ */
+
+bool sieve_extensions_init(struct sieve_instance *svinst);
+void sieve_extensions_configure(struct sieve_instance *svinst);
+void sieve_extensions_deinit(struct sieve_instance *svinst);
+
+/*
+ * Pre-loaded extensions
+ */
+
+const struct sieve_extension *const *sieve_extensions_get_preloaded
+	(struct sieve_instance *svinst, unsigned int *count_r);
+
+/*
+ * Extension registry
+ */
+
+const struct sieve_extension *sieve_extension_register
+	(struct sieve_instance *svinst, const struct sieve_extension_def *extension,
+		bool load);
+const struct sieve_extension *sieve_extension_require
+	(struct sieve_instance *svinst, const struct sieve_extension_def *extension,
+		bool load);
+bool sieve_extension_reload(const struct sieve_extension *ext);
+
+void sieve_extension_unregister(const struct sieve_extension *ext);
+
+const struct sieve_extension *sieve_extension_replace
+	(struct sieve_instance *svinst,
+		const struct sieve_extension_def *extdef,
+		bool load);
+void sieve_extension_override
+	(struct sieve_instance *svinst, const char *name,
+		const struct sieve_extension *ext);
+
+unsigned int sieve_extensions_get_count(struct sieve_instance *svinst);
+const struct sieve_extension *const *
+sieve_extensions_get_all(struct sieve_instance *svinst,
+	unsigned int *count_r);
+
+const struct sieve_extension *sieve_extension_get_by_id
+	(struct sieve_instance *svinst, unsigned int ext_id);
+const struct sieve_extension *sieve_extension_get_by_name
+	(struct sieve_instance *svinst, const char *name);
+
+const char *sieve_extensions_get_string
+	(struct sieve_instance *svinst);
+void sieve_extensions_set_string
+	(struct sieve_instance *svinst, const char *ext_string,
+		bool global, bool implicit);
+
+const struct sieve_extension *sieve_get_match_type_extension
+	(struct sieve_instance *svinst);
+const struct sieve_extension *sieve_get_comparator_extension
+	(struct sieve_instance *svinst);
+const struct sieve_extension *sieve_get_address_part_extension
+	(struct sieve_instance *svinst);
+
+void sieve_enable_debug_extension(struct sieve_instance *svinst);
+
+/*
+ * Capability registries
+ */
+
+struct sieve_extension_capabilities {
+	const char *name;
+
+	const char *(*get_string)(const struct sieve_extension *ext);
+};
+
+void sieve_extension_capabilities_register
+	(const struct sieve_extension *ext,
+		const struct sieve_extension_capabilities *cap);
+void sieve_extension_capabilities_unregister
+	(const struct sieve_extension *ext);
+
+const char *sieve_extension_capabilities_get_string
+	(struct sieve_instance *svinst, const char *cap_name);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-generator.c b/pigeonhole/src/lib-sieve/sieve-generator.c
new file mode 100644
index 0000000..ebc06ed
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-generator.c
@@ -0,0 +1,578 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "mempool.h"
+
+#include "sieve-common.h"
+#include "sieve-script.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+
+#include "sieve-generator.h"
+
+/*
+ * Jump list
+ */
+
+struct sieve_jumplist *
+sieve_jumplist_create(pool_t pool, struct sieve_binary_block *sblock)
+{
+	struct sieve_jumplist *jlist;
+
+	jlist = p_new(pool, struct sieve_jumplist, 1);
+	jlist->block = sblock;
+	p_array_init(&jlist->jumps, pool, 4);
+
+	return jlist;
+}
+
+void sieve_jumplist_init_temp(struct sieve_jumplist *jlist,
+			      struct sieve_binary_block *sblock)
+{
+	jlist->block = sblock;
+	t_array_init(&jlist->jumps, 4);
+}
+
+void sieve_jumplist_reset(struct sieve_jumplist *jlist)
+{
+	array_clear(&jlist->jumps);
+}
+
+void sieve_jumplist_add(struct sieve_jumplist *jlist, sieve_size_t jump)
+{
+	array_append(&jlist->jumps, &jump, 1);
+}
+
+void sieve_jumplist_resolve(struct sieve_jumplist *jlist)
+{
+	unsigned int i;
+
+	for (i = 0; i < array_count(&jlist->jumps); i++) {
+		const sieve_size_t *jump = array_idx(&jlist->jumps, i);
+
+		sieve_binary_resolve_offset(jlist->block, *jump);
+	}
+}
+
+/*
+ * Code Generator
+ */
+
+struct sieve_generator {
+	pool_t pool;
+
+	struct sieve_instance *instance;
+
+	struct sieve_error_handler *ehandler;
+
+	struct sieve_codegen_env genenv;
+	struct sieve_binary_debug_writer *dwriter;
+
+	ARRAY(void *) ext_contexts;
+};
+
+struct sieve_generator *
+sieve_generator_create(struct sieve_ast *ast,
+		       struct sieve_error_handler *ehandler,
+		       enum sieve_compile_flags flags)
+{
+	pool_t pool;
+	struct sieve_generator *gentr;
+	struct sieve_script *script;
+	struct sieve_instance *svinst;
+
+	pool = pool_alloconly_create("sieve_generator", 4096);
+	gentr = p_new(pool, struct sieve_generator, 1);
+	gentr->pool = pool;
+
+	gentr->ehandler = ehandler;
+	sieve_error_handler_ref(ehandler);
+
+	gentr->genenv.gentr = gentr;
+	gentr->genenv.flags = flags;
+	gentr->genenv.ast = ast;
+	sieve_ast_ref(ast);
+
+	script = sieve_ast_script(ast);
+	svinst = sieve_script_svinst(script);
+
+	gentr->genenv.script = script;
+	gentr->genenv.svinst = svinst;
+
+	/* Setup storage for extension contexts */
+	p_array_init(&gentr->ext_contexts, pool,
+		     sieve_extensions_get_count(svinst));
+
+	return gentr;
+}
+
+void sieve_generator_free(struct sieve_generator **gentr)
+{
+	sieve_ast_unref(&(*gentr)->genenv.ast);
+
+	sieve_error_handler_unref(&(*gentr)->ehandler);
+	sieve_binary_debug_writer_deinit(&(*gentr)->dwriter);
+
+	sieve_binary_unref(&(*gentr)->genenv.sbin);
+
+	pool_unref(&((*gentr)->pool));
+
+	*gentr = NULL;
+}
+
+/*
+ * Accessors
+ */
+
+struct sieve_error_handler *
+sieve_generator_error_handler(struct sieve_generator *gentr)
+{
+	return gentr->ehandler;
+}
+
+pool_t sieve_generator_pool(struct sieve_generator *gentr)
+{
+	return gentr->pool;
+}
+
+struct sieve_script *sieve_generator_script(struct sieve_generator *gentr)
+{
+	return gentr->genenv.script;
+}
+
+struct sieve_binary *sieve_generator_get_binary(struct sieve_generator *gentr)
+{
+	return gentr->genenv.sbin;
+}
+
+struct sieve_binary_block *
+sieve_generator_get_block(struct sieve_generator *gentr)
+{
+	return gentr->genenv.sblock;
+}
+
+/*
+ * Extension support
+ */
+
+void sieve_generator_extension_set_context(struct sieve_generator *gentr,
+					   const struct sieve_extension *ext,
+					   void *context)
+{
+	if (ext->id < 0)
+		return;
+
+	array_idx_set(&gentr->ext_contexts, (unsigned int) ext->id, &context);
+}
+
+const void *
+sieve_generator_extension_get_context(struct sieve_generator *gentr,
+				      const struct sieve_extension *ext)
+{
+	void * const *ctx;
+
+	if (ext->id < 0 || ext->id >= (int) array_count(&gentr->ext_contexts))
+		return NULL;
+
+	ctx = array_idx(&gentr->ext_contexts, (unsigned int) ext->id);
+
+	return *ctx;
+}
+
+/*
+ * Code generation API
+ */
+
+static void
+sieve_generate_debug_from_ast_node(const struct sieve_codegen_env *cgenv,
+				   struct sieve_ast_node *ast_node)
+{
+	sieve_size_t address = sieve_binary_block_get_size(cgenv->sblock);
+	unsigned int line = sieve_ast_node_line(ast_node);
+
+	sieve_binary_debug_emit(cgenv->gentr->dwriter, address, line, 0);
+}
+
+static void
+sieve_generate_debug_from_ast_argument(const struct sieve_codegen_env *cgenv,
+				       struct sieve_ast_argument *ast_arg)
+{
+	sieve_size_t address = sieve_binary_block_get_size(cgenv->sblock);
+	unsigned int line = sieve_ast_argument_line(ast_arg);
+
+	sieve_binary_debug_emit(cgenv->gentr->dwriter, address, line, 0);
+}
+
+bool sieve_generate_argument(const struct sieve_codegen_env *cgenv,
+			     struct sieve_ast_argument *arg,
+			     struct sieve_command *cmd)
+{
+	const struct sieve_argument_def *arg_def;
+
+	if (arg->argument == NULL || arg->argument->def == NULL)
+		return FALSE;
+
+	arg_def = arg->argument->def;
+
+	if (arg_def->generate == NULL)
+		return TRUE;
+
+	sieve_generate_debug_from_ast_argument(cgenv, arg);
+
+	return arg_def->generate(cgenv, arg, cmd);
+}
+
+bool sieve_generate_arguments(const struct sieve_codegen_env *cgenv,
+			      struct sieve_command *cmd,
+			      struct sieve_ast_argument **last_arg_r)
+{
+	enum { ARG_START, ARG_OPTIONAL, ARG_POSITIONAL } state = ARG_START;
+	struct sieve_ast_argument *arg =
+		sieve_ast_argument_first(cmd->ast_node);
+
+	/* Generate all arguments with assigned generator function */
+
+	while (arg != NULL) {
+		const struct sieve_argument *argument;
+		const struct sieve_argument_def *arg_def;
+
+		if (arg->argument == NULL || arg->argument->def == NULL)
+			return FALSE;
+
+		argument = arg->argument;
+		arg_def = argument->def;
+
+		switch (state) {
+		case ARG_START:
+			if (argument->id_code == 0)
+				state = ARG_POSITIONAL;
+			else {
+				/* Mark start of optional operands with 0
+				   operand identifier */
+				sieve_binary_emit_byte(cgenv->sblock,
+						       SIEVE_OPERAND_OPTIONAL);
+
+				/* Emit argument id for optional operand */
+				sieve_binary_emit_byte(
+					cgenv->sblock,
+					(unsigned char)argument->id_code);
+
+				state = ARG_OPTIONAL;
+			}
+			break;
+		case ARG_OPTIONAL:
+			if (argument->id_code == 0)
+				state = ARG_POSITIONAL;
+
+			/* Emit argument id for optional operand (0 marks the
+			   end of the optionals) */
+			sieve_binary_emit_byte(
+				cgenv->sblock,
+				(unsigned char)argument->id_code);
+			break;
+		case ARG_POSITIONAL:
+			if (argument->id_code != 0)
+				return FALSE;
+			break;
+		}
+
+		/* Call the generation function for the argument */
+		if (arg_def->generate != NULL) {
+			sieve_generate_debug_from_ast_argument(cgenv, arg);
+
+			if (!arg_def->generate(cgenv, arg, cmd))
+				return FALSE;
+		} else if (state == ARG_POSITIONAL) {
+			break;
+		}
+
+		arg = sieve_ast_argument_next(arg);
+	}
+
+	/* Mark end of optional list if it is still open */
+	if (state == ARG_OPTIONAL)
+		sieve_binary_emit_byte(cgenv->sblock, 0);
+
+	if (last_arg_r != NULL)
+		*last_arg_r = arg;
+
+	return TRUE;
+}
+
+bool sieve_generate_argument_parameters(const struct sieve_codegen_env *cgenv,
+					struct sieve_command *cmd,
+					struct sieve_ast_argument *arg)
+{
+	struct sieve_ast_argument *param = arg->parameters;
+
+	/* Generate all parameters with assigned generator function */
+
+	while (param != NULL) {
+		if (param->argument != NULL && param->argument->def != NULL) {
+			const struct sieve_argument_def *parameter =
+				param->argument->def;
+
+			/* Call the generation function for the parameter */
+			if (parameter->generate != NULL) {
+				sieve_generate_debug_from_ast_argument(
+					cgenv, param);
+
+				if (!parameter->generate(cgenv, param, cmd))
+					return FALSE;
+			}
+		}
+
+		param = sieve_ast_argument_next(param);
+	}
+
+	return TRUE;
+}
+
+bool sieve_generate_test(const struct sieve_codegen_env *cgenv,
+			 struct sieve_ast_node *tst_node,
+			 struct sieve_jumplist *jlist, bool jump_true)
+{
+	struct sieve_command *test;
+	const struct sieve_command_def *tst_def;
+
+	i_assert(tst_node->command != NULL && tst_node->command->def != NULL);
+
+	test = tst_node->command;
+	tst_def = test->def;
+
+	if (tst_def->control_generate != NULL) {
+		sieve_generate_debug_from_ast_node(cgenv, tst_node);
+
+		if (tst_def->control_generate(cgenv, test, jlist, jump_true))
+			return TRUE;
+
+		return FALSE;
+	}
+
+	if (tst_def->generate != NULL) {
+		sieve_generate_debug_from_ast_node(cgenv, tst_node);
+
+		if (tst_def->generate(cgenv, test)) {
+
+			if (jump_true) {
+				sieve_operation_emit(cgenv->sblock, NULL,
+						     &sieve_jmptrue_operation);
+			} else {
+				sieve_operation_emit(cgenv->sblock, NULL,
+						     &sieve_jmpfalse_operation);
+			}
+			sieve_jumplist_add(
+				jlist,
+				sieve_binary_emit_offset(cgenv->sblock, 0));
+			return TRUE;
+		}
+
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+static bool
+sieve_generate_command(const struct sieve_codegen_env *cgenv,
+		       struct sieve_ast_node *cmd_node)
+{
+	struct sieve_command *command;
+	const struct sieve_command_def *cmd_def;
+
+	i_assert(cmd_node->command != NULL && cmd_node->command->def != NULL);
+
+	command = cmd_node->command;
+	cmd_def = command->def;
+
+	if (cmd_def->generate != NULL) {
+		sieve_generate_debug_from_ast_node(cgenv, cmd_node);
+
+		return cmd_def->generate(cgenv, command);
+	}
+
+	return TRUE;
+}
+
+bool sieve_generate_block(const struct sieve_codegen_env *cgenv,
+			  struct sieve_ast_node *block)
+{
+	bool result = TRUE;
+	struct sieve_ast_node *cmd_node;
+
+	T_BEGIN {
+		cmd_node = sieve_ast_command_first(block);
+		while (result && cmd_node != NULL) {
+			result = sieve_generate_command(cgenv, cmd_node);
+			cmd_node = sieve_ast_command_next(cmd_node);
+		}
+	} T_END;
+
+	return result;
+}
+
+struct sieve_binary *
+sieve_generator_run(struct sieve_generator *gentr,
+		    struct sieve_binary_block **sblock_r)
+{
+	bool topmost = (sblock_r == NULL || *sblock_r == NULL);
+	struct sieve_binary *sbin;
+	struct sieve_binary_block *sblock, *debug_block;
+	const struct sieve_extension *const *extensions;
+	unsigned int i, ext_count;
+	bool result = TRUE;
+
+	/* Initialize */
+
+	if (topmost) {
+		sbin = sieve_binary_create_new(
+			sieve_ast_script(gentr->genenv.ast));
+		sblock = sieve_binary_block_get(
+			sbin, SBIN_SYSBLOCK_MAIN_PROGRAM);
+	} else {
+		sblock = *sblock_r;
+		sbin = sieve_binary_block_get_binary(sblock);
+	}
+
+	i_assert(sbin != NULL);
+
+	gentr->genenv.sbin = sbin;
+	gentr->genenv.sblock = sblock;
+	sieve_binary_ref(gentr->genenv.sbin);
+
+	/* Create debug block */
+	debug_block = sieve_binary_block_create(sbin);
+	gentr->dwriter = sieve_binary_debug_writer_init(debug_block);
+	(void)sieve_binary_emit_unsigned(
+		sblock, sieve_binary_block_get_id(debug_block));
+
+	/* Load extensions linked to the AST and emit a list in code */
+	extensions = sieve_ast_extensions_get(gentr->genenv.ast, &ext_count);
+	(void) sieve_binary_emit_unsigned(sblock, ext_count);
+	for (i = 0; i < ext_count; i++) {
+		const struct sieve_extension *ext = extensions[i];
+		bool deferred;
+
+		/* Link to binary */
+		(void)sieve_binary_extension_link(sbin, ext);
+
+		/* Emit */
+		sieve_binary_emit_extension(sblock, ext, 0);
+
+		/* Emit deferred flag */
+		deferred = !sieve_ast_extension_is_required(
+			gentr->genenv.ast, ext);
+		sieve_binary_emit_byte(sblock, (deferred ? 1 : 0));
+
+		/* Load */
+		if (ext->def != NULL && ext->def->generator_load != NULL &&
+		    !ext->def->generator_load(ext, &gentr->genenv))
+			result = FALSE;
+	}
+
+	/* Generate code */
+
+	if (result) {
+		if (!sieve_generate_block(&gentr->genenv,
+					  sieve_ast_root(gentr->genenv.ast))) {
+			result = FALSE;
+		} else if (topmost) {
+			sieve_binary_activate(sbin);
+		}
+	}
+
+	/* Cleanup */
+
+	sieve_binary_unref(&gentr->genenv.sbin);
+	gentr->genenv.sblock = NULL;
+
+	if (!result) {
+		if (topmost) {
+			sieve_binary_unref(&sbin);
+			if (sblock_r != NULL)
+				*sblock_r = NULL;
+		}
+		sbin = NULL;
+	} else {
+		if (sblock_r != NULL)
+			*sblock_r = sblock;
+	}
+
+	return sbin;
+}
+
+/*
+ * Error handling
+ */
+
+#undef sieve_generator_error
+void sieve_generator_error(struct sieve_generator *gentr,
+			   const char *csrc_filename, unsigned int csrc_linenum,
+			   unsigned int source_line, const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_ERROR,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+	};
+	va_list args;
+
+	params.location =
+		sieve_error_script_location(gentr->genenv.script, source_line);
+
+	va_start(args, fmt);
+	sieve_logv(gentr->ehandler, &params, fmt, args);
+	va_end(args);
+}
+
+#undef sieve_generator_warning
+void sieve_generator_warning(struct sieve_generator *gentr,
+			     const char *csrc_filename,
+			     unsigned int csrc_linenum,
+			     unsigned int source_line, const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_WARNING,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+	};
+	va_list args;
+
+	params.location =
+		sieve_error_script_location(gentr->genenv.script, source_line);
+
+	va_start(args, fmt);
+	sieve_logv(gentr->ehandler, &params, fmt, args);
+	va_end(args);
+}
+
+#undef sieve_generator_critical
+void sieve_generator_critical(struct sieve_generator *gentr,
+			      const char *csrc_filename,
+			      unsigned int csrc_linenum,
+			      unsigned int source_line, const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_ERROR,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+	};
+	va_list args;
+
+	params.location =
+		sieve_error_script_location(gentr->genenv.script, source_line);
+
+	va_start(args, fmt);
+	sieve_criticalv(gentr->genenv.svinst, gentr->ehandler, &params,
+			"Code generation failed", fmt, args);
+	va_end(args);
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-generator.h b/pigeonhole/src/lib-sieve/sieve-generator.h
new file mode 100644
index 0000000..fab2023
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-generator.h
@@ -0,0 +1,121 @@
+#ifndef SIEVE_GENERATOR_H
+#define SIEVE_GENERATOR_H
+
+#include "sieve-common.h"
+
+/*
+ * Code generator
+ */
+
+struct sieve_generator;
+
+struct sieve_codegen_env {
+	struct sieve_generator *gentr;
+
+	struct sieve_instance *svinst;
+	enum sieve_compile_flags flags;
+
+	struct sieve_script *script;
+	struct sieve_ast *ast;
+
+	struct sieve_binary *sbin;
+	struct sieve_binary_block *sblock;
+};
+
+struct sieve_generator *
+sieve_generator_create(struct sieve_ast *ast,
+		       struct sieve_error_handler *ehandler,
+		       enum sieve_compile_flags flags);
+void sieve_generator_free(struct sieve_generator **generator);
+
+/*
+ * Accessors
+ */
+
+struct sieve_error_handler *
+sieve_generator_error_handler(struct sieve_generator *gentr);
+pool_t sieve_generator_pool(struct sieve_generator *gentr);
+struct sieve_script *sieve_generator_script(struct sieve_generator *gentr);
+struct sieve_binary *sieve_generator_get_binary(struct sieve_generator *gentr);
+struct sieve_binary_block *
+sieve_generator_get_block(struct sieve_generator *gentr);
+
+/*
+ * Extension support
+ */
+
+void sieve_generator_extension_set_context(struct sieve_generator *gentr,
+					   const struct sieve_extension *ext,
+					   void *context);
+const void *
+sieve_generator_extension_get_context(struct sieve_generator *gentr,
+				      const struct sieve_extension *ext);
+
+/*
+ * Jump list
+ */
+
+struct sieve_jumplist {
+	pool_t pool;
+	struct sieve_binary_block *block;
+	ARRAY(sieve_size_t) jumps;
+};
+
+struct sieve_jumplist *
+sieve_jumplist_create(pool_t pool, struct sieve_binary_block *sblock);
+void sieve_jumplist_init_temp(struct sieve_jumplist *jlist,
+			      struct sieve_binary_block *sblock);
+void sieve_jumplist_reset(struct sieve_jumplist *jlist);
+void sieve_jumplist_add(struct sieve_jumplist *jlist, sieve_size_t jump);
+void sieve_jumplist_resolve(struct sieve_jumplist *jlist);
+
+/*
+ * Code generation API
+ */
+
+bool sieve_generate_argument(const struct sieve_codegen_env *cgenv,
+			     struct sieve_ast_argument *arg,
+			     struct sieve_command *cmd);
+bool sieve_generate_arguments(const struct sieve_codegen_env *cgenv,
+			      struct sieve_command *cmd,
+			      struct sieve_ast_argument **last_arg_r);
+bool sieve_generate_argument_parameters(const struct sieve_codegen_env *cgenv,
+					struct sieve_command *cmd,
+					struct sieve_ast_argument *arg);
+
+bool sieve_generate_block(const struct sieve_codegen_env *cgenv,
+			  struct sieve_ast_node *block);
+bool sieve_generate_test(const struct sieve_codegen_env *cgenv,
+			 struct sieve_ast_node *tst_node,
+			 struct sieve_jumplist *jlist, bool jump_true);
+struct sieve_binary *
+sieve_generator_run(struct sieve_generator *gentr,
+		    struct sieve_binary_block **sblock_r);
+
+/*
+ * Error handling
+ */
+
+void sieve_generator_error(struct sieve_generator *gentr,
+			   const char *csrc_filename, unsigned int csrc_linenum,
+			   unsigned int source_line, const char *fmt, ...)
+			   ATTR_FORMAT(5, 6);
+#define sieve_generator_error(gentr, ...) \
+	sieve_generator_error(gentr, __FILE__, __LINE__, __VA_ARGS__)
+void sieve_generator_warning(struct sieve_generator *gentr,
+			     const char *csrc_filename,
+			     unsigned int csrc_linenum,
+			     unsigned int source_line, const char *fmt, ...)
+			     ATTR_FORMAT(5, 6);
+#define sieve_generator_warning(gentr, ...) \
+	sieve_generator_warning(gentr, __FILE__, __LINE__, __VA_ARGS__)
+void sieve_generator_critical(struct sieve_generator *gentr,
+			      const char *csrc_filename,
+			      unsigned int csrc_linenum,
+			      unsigned int source_line, const char *fmt, ...)
+			      ATTR_FORMAT(5, 6);
+#define sieve_generator_critical(gentr, ...) \
+	sieve_generator_critical(gentr, __FILE__, __LINE__, __VA_ARGS__)
+
+#endif
+
diff --git a/pigeonhole/src/lib-sieve/sieve-interpreter.c b/pigeonhole/src/lib-sieve/sieve-interpreter.c
new file mode 100644
index 0000000..274e142
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-interpreter.c
@@ -0,0 +1,1196 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "ostream.h"
+#include "mempool.h"
+#include "array.h"
+#include "hash.h"
+#include "cpu-limit.h"
+#include "mail-storage.h"
+
+#include "sieve-common.h"
+#include "sieve-limits.h"
+#include "sieve-script.h"
+#include "sieve-error.h"
+#include "sieve-extensions.h"
+#include "sieve-message.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-actions.h"
+#include "sieve-generator.h"
+#include "sieve-binary.h"
+#include "sieve-result.h"
+#include "sieve-comparators.h"
+#include "sieve-runtime-trace.h"
+
+#include "sieve-interpreter.h"
+
+#include <string.h>
+
+static struct event_category event_category_sieve_runtime = {
+	.parent = &event_category_sieve,
+	.name = "sieve-runtime",
+};
+
+/*
+ * Interpreter extension
+ */
+
+struct sieve_interpreter_extension_reg {
+	const struct sieve_interpreter_extension *intext;
+	const struct sieve_extension *ext;
+
+	void *context;
+
+	bool deferred:1;
+	bool started:1;
+};
+
+/*
+ * Code loop
+ */
+
+struct sieve_interpreter_loop {
+	unsigned int level;
+	sieve_size_t begin, end;
+	const struct sieve_extension_def *ext_def;
+	pool_t pool;
+	void *context;
+};
+
+/*
+ * Interpreter
+ */
+
+struct sieve_interpreter {
+	pool_t pool;
+	struct sieve_interpreter *parent;
+
+	/* Runtime data for extensions */
+	ARRAY(struct sieve_interpreter_extension_reg) extensions;
+
+	sieve_size_t reset_vector;
+
+	/* Execution status */
+	sieve_size_t pc;          /* Program counter */
+
+	/* Loop stack */
+	ARRAY(struct sieve_interpreter_loop) loop_stack;
+	sieve_size_t loop_limit;
+	unsigned int parent_loop_level;
+
+	/* Runtime environment */
+	struct sieve_runtime_env runenv;
+	struct sieve_runtime_trace trace;
+	struct sieve_resource_usage rusage;
+
+	/* Current operation */
+	struct sieve_operation oprtn;
+
+	/* Location information */
+	struct sieve_binary_debug_reader *dreader;
+	unsigned int command_line;
+
+	bool running:1;		    /* Interpreter is running
+				       (may be interrupted) */
+	bool interrupted:1;         /* Interpreter interrupt requested */
+	bool test_result:1;         /* Result of previous test command */
+};
+
+static struct sieve_interpreter *
+_sieve_interpreter_create(struct sieve_binary *sbin,
+			  struct sieve_binary_block *sblock,
+			  struct sieve_script *script,
+			  struct sieve_interpreter *parent,
+			  const struct sieve_execute_env *eenv,
+			  struct sieve_error_handler *ehandler) ATTR_NULL(3, 4)
+{
+	const struct sieve_script_env *senv = eenv->scriptenv;
+	unsigned int i, ext_count;
+	struct sieve_interpreter *interp;
+	pool_t pool;
+	struct sieve_instance *svinst;
+	const struct sieve_extension *const *ext_preloaded;
+	unsigned int debug_block_id;
+	sieve_size_t *address;
+	bool success = TRUE;
+
+	pool = pool_alloconly_create("sieve_interpreter", 4096);
+	interp = p_new(pool, struct sieve_interpreter, 1);
+	interp->parent = parent;
+	interp->pool = pool;
+
+	interp->runenv.ehandler = ehandler;
+	sieve_error_handler_ref(ehandler);
+
+	interp->runenv.exec_env = eenv;
+	interp->runenv.interp = interp;
+	interp->runenv.oprtn = &interp->oprtn;
+	interp->runenv.sbin = sbin;
+	interp->runenv.sblock = sblock;
+	sieve_binary_ref(sbin);
+
+	interp->runenv.event = event_create(eenv->event);
+	event_add_category(interp->runenv.event, &event_category_sieve_runtime);
+	event_add_str(interp->runenv.event, "script_name",
+		      sieve_binary_script_name(sbin));
+	event_add_str(interp->runenv.event, "script_location",
+		      sieve_binary_script_location(sbin));
+	event_add_str(interp->runenv.event, "binary_path",
+		      sieve_binary_path(sbin));
+
+	svinst = sieve_binary_svinst(sbin);
+
+	if (senv->trace_log != NULL) {
+		interp->trace.log = senv->trace_log;
+		interp->trace.config = senv->trace_config;
+		interp->trace.indent = 0;
+		interp->runenv.trace = &interp->trace;
+	}
+
+	if (script == NULL)
+		interp->runenv.script = sieve_binary_script(sbin);
+	else
+		interp->runenv.script = script;
+
+	interp->runenv.pc = 0;
+	address = &(interp->runenv.pc);
+
+	sieve_runtime_trace_begin(&(interp->runenv));
+
+	p_array_init(&interp->extensions, pool,
+		     sieve_extensions_get_count(svinst));
+
+	interp->parent_loop_level = 0;
+	if (parent != NULL && array_is_created(&parent->loop_stack)) {
+		interp->parent_loop_level = parent->parent_loop_level +
+			array_count(&parent->loop_stack);
+	}
+
+	/* Pre-load core language features implemented as 'extensions' */
+	ext_preloaded = sieve_extensions_get_preloaded(svinst, &ext_count);
+	for (i = 0; i < ext_count; i++) {
+		const struct sieve_extension_def *ext_def =
+			ext_preloaded[i]->def;
+
+		if (ext_def != NULL && ext_def->interpreter_load != NULL) {
+			(void)ext_def->interpreter_load(ext_preloaded[i],
+							&interp->runenv,
+							address);
+		}
+	}
+
+	/* Load debug block */
+	if (sieve_binary_read_unsigned(sblock, address, &debug_block_id)) {
+		struct sieve_binary_block *debug_block =
+			sieve_binary_block_get(sbin, debug_block_id);
+
+		if (debug_block == NULL) {
+			sieve_runtime_trace_error(&interp->runenv,
+						  "invalid id for debug block");
+			success = FALSE;
+		} else {
+			/* Initialize debug reader */
+			interp->dreader =
+				sieve_binary_debug_reader_init(debug_block);
+		}
+	}
+
+	/* Load other extensions listed in code */
+	if (success && sieve_binary_read_unsigned(sblock, address,
+						  &ext_count)) {
+
+		for (i = 0; i < ext_count; i++) {
+			unsigned int code = 0, deferred;
+			struct sieve_interpreter_extension_reg *reg;
+			const struct sieve_extension *ext;
+
+			if (!sieve_binary_read_extension(sblock, address,
+							 &code, &ext) ||
+			    !sieve_binary_read_byte(sblock, address,
+						    &deferred)) {
+				success = FALSE;
+				break;
+			}
+
+			if (deferred > 0 && ext->id >= 0) {
+				reg = array_idx_get_space(
+					&interp->extensions,
+					(unsigned int)ext->id);
+				reg->deferred = TRUE;
+			}
+
+			if (ext->def != NULL) {
+				if (ext->global &&
+				    (eenv->flags & SIEVE_EXECUTE_FLAG_NOGLOBAL) != 0) {
+					sieve_runtime_error(&interp->runenv, NULL,
+						"failed to enable extension `%s': "
+						"its use is restricted to global scripts",
+						sieve_extension_name(ext));
+					success = FALSE;
+					break;
+				}
+
+				if (ext->def->interpreter_load != NULL &&
+				    !ext->def->interpreter_load(ext, &interp->runenv,
+								address)) {
+					success = FALSE;
+					break;
+				}
+			}
+		}
+	} else {
+		success = FALSE;
+	}
+
+	if (!success) {
+		sieve_interpreter_free(&interp);
+		interp = NULL;
+	} else {
+		interp->reset_vector = *address;
+	}
+
+	return interp;
+}
+
+struct sieve_interpreter *
+sieve_interpreter_create(struct sieve_binary *sbin,
+			 struct sieve_interpreter *parent,
+			 const struct sieve_execute_env *eenv,
+			 struct sieve_error_handler *ehandler)
+{
+	struct sieve_binary_block *sblock;
+
+	if ((sblock = sieve_binary_block_get(
+		sbin, SBIN_SYSBLOCK_MAIN_PROGRAM)) == NULL)
+		return NULL;
+
+	return _sieve_interpreter_create(sbin, sblock, NULL, parent, eenv,
+					 ehandler);
+}
+
+struct sieve_interpreter *
+sieve_interpreter_create_for_block(struct sieve_binary_block *sblock,
+				   struct sieve_script *script,
+				   struct sieve_interpreter *parent,
+				   const struct sieve_execute_env *eenv,
+				   struct sieve_error_handler *ehandler)
+{
+	if (sblock == NULL) return NULL;
+
+	return _sieve_interpreter_create(sieve_binary_block_get_binary(sblock),
+					 sblock, script, parent, eenv,
+					 ehandler);
+}
+
+void sieve_interpreter_free(struct sieve_interpreter **_interp)
+{
+	struct sieve_interpreter *interp = *_interp;
+	struct sieve_runtime_env *renv = &interp->runenv;
+	const struct sieve_interpreter_extension_reg *eregs;
+	struct sieve_interpreter_loop *loops;
+	unsigned int count, i;
+
+	if (interp->running) {
+		struct event_passthrough *e =
+			event_create_passthrough(interp->runenv.event)->
+			set_name("sieve_runtime_script_finished")->
+			add_str("error", "Aborted");
+		e_debug(e->event(), "Aborted running script `%s'",
+			sieve_binary_source(interp->runenv.sbin));
+
+		interp->running = FALSE;
+	}
+
+	if (array_is_created(&interp->loop_stack)) {
+		loops = array_get_modifiable(&interp->loop_stack, &count);
+		for (i = 0; i < count; i++)
+			pool_unref(&loops[i].pool);
+	}
+
+	interp->trace.indent = 0;
+	sieve_runtime_trace_end(renv);
+
+	/* Signal registered extensions that the interpreter is being destroyed */
+	eregs = array_get(&interp->extensions, &count);
+	for (i = 0; i < count; i++) {
+		if (eregs[i].intext != NULL && eregs[i].intext->free != NULL) {
+			eregs[i].intext->free(eregs[i].ext, interp,
+					      eregs[i].context);
+		}
+	}
+
+	sieve_binary_debug_reader_deinit(&interp->dreader);
+	sieve_binary_unref(&renv->sbin);
+	sieve_error_handler_unref(&renv->ehandler);
+	event_unref(&renv->event);
+
+	pool_unref(&interp->pool);
+	*_interp = NULL;
+}
+
+/*
+ * Accessors
+ */
+
+pool_t sieve_interpreter_pool(struct sieve_interpreter *interp)
+{
+	return interp->pool;
+}
+
+struct sieve_interpreter *
+sieve_interpreter_get_parent(struct sieve_interpreter *interp)
+{
+	return interp->parent;
+}
+
+struct sieve_script *sieve_interpreter_script(struct sieve_interpreter *interp)
+{
+	return interp->runenv.script;
+}
+
+struct sieve_error_handler *
+sieve_interpreter_get_error_handler(struct sieve_interpreter *interp)
+{
+	return interp->runenv.ehandler;
+}
+
+struct sieve_instance *
+sieve_interpreter_svinst(struct sieve_interpreter *interp)
+{
+	return interp->runenv.exec_env->svinst;
+}
+
+/* Do not use this function for normal sieve extensions. This is intended for
+ * the testsuite only.
+ */
+void sieve_interpreter_set_result(struct sieve_interpreter *interp,
+				  struct sieve_result *result)
+{
+	sieve_result_unref(&interp->runenv.result);
+	interp->runenv.result = result;
+	interp->runenv.msgctx = sieve_result_get_message_context(result);
+	sieve_result_ref(result);
+}
+
+/*
+ * Source location
+ */
+
+unsigned int
+sieve_runtime_get_source_location(const struct sieve_runtime_env *renv,
+				  sieve_size_t code_address)
+{
+	struct sieve_interpreter *interp = renv->interp;
+
+	if (interp->dreader == NULL)
+		return 0;
+
+	if (interp->command_line == 0) {
+		interp->command_line =
+			sieve_binary_debug_read_line(interp->dreader,
+						     renv->oprtn->address);
+	}
+
+	return sieve_binary_debug_read_line(interp->dreader, code_address);
+}
+
+unsigned int
+sieve_runtime_get_command_location(const struct sieve_runtime_env *renv)
+{
+	struct sieve_interpreter *interp = renv->interp;
+
+	if (interp->dreader == NULL)
+		return 0;
+
+	if (interp->command_line == 0) {
+		interp->command_line =
+			sieve_binary_debug_read_line(interp->dreader,
+						     renv->oprtn->address);
+	}
+
+	return interp->command_line;
+}
+
+const char *
+sieve_runtime_get_full_command_location(const struct sieve_runtime_env *renv)
+{
+	return sieve_error_script_location(
+		renv->script, sieve_runtime_get_command_location(renv));
+}
+
+/*
+ * Extension support
+ */
+
+void sieve_interpreter_extension_register(
+	struct sieve_interpreter *interp, const struct sieve_extension *ext,
+	const struct sieve_interpreter_extension *intext, void *context)
+{
+	struct sieve_interpreter_extension_reg *reg;
+
+	if (ext->id < 0)
+		return;
+
+	reg = array_idx_get_space(&interp->extensions, (unsigned int) ext->id);
+	reg->intext = intext;
+	reg->ext = ext;
+	reg->context = context;
+}
+
+void sieve_interpreter_extension_set_context(struct sieve_interpreter *interp,
+					     const struct sieve_extension *ext,
+					     void *context)
+{
+	struct sieve_interpreter_extension_reg *reg;
+
+	if (ext->id < 0)
+		return;
+
+	reg = array_idx_get_space(&interp->extensions, (unsigned int) ext->id);
+	reg->context = context;
+}
+
+void *sieve_interpreter_extension_get_context(struct sieve_interpreter *interp,
+					      const struct sieve_extension *ext)
+{
+	const struct sieve_interpreter_extension_reg *reg;
+
+	if (ext->id < 0 || ext->id >= (int) array_count(&interp->extensions))
+		return NULL;
+
+	reg = array_idx(&interp->extensions, (unsigned int) ext->id);
+
+	return reg->context;
+}
+
+int sieve_interpreter_extension_start(struct sieve_interpreter *interp,
+				      const struct sieve_extension *ext)
+{
+	struct sieve_interpreter_extension_reg *reg;
+	int ret;
+
+	i_assert(ext->id >= 0);
+
+	if (ext->id >= (int) array_count(&interp->extensions))
+		return SIEVE_EXEC_OK;
+
+	reg = array_idx_modifiable(&interp->extensions, (unsigned int)ext->id);
+
+	if (!reg->deferred)
+		return SIEVE_EXEC_OK;
+	reg->deferred = FALSE;
+	reg->started = TRUE;
+
+	if (reg->intext != NULL && reg->intext->run != NULL &&
+	    (ret = reg->intext->run(ext, &interp->runenv,
+				    reg->context, TRUE)) <= 0)
+		return ret;
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Loop handling
+ */
+
+int sieve_interpreter_loop_start(struct sieve_interpreter *interp,
+				 sieve_size_t loop_end,
+				 const struct sieve_extension_def *ext_def,
+				 struct sieve_interpreter_loop **loop_r)
+{
+	const struct sieve_runtime_env *renv = &interp->runenv;
+	struct sieve_interpreter_loop *loop;
+
+	i_assert(loop_end > interp->runenv.pc);
+
+	/* Check supplied end offset */
+	if (loop_end > sieve_binary_block_get_size(renv->sblock)) {
+		sieve_runtime_trace_error(renv, "loop end offset out of range");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	/* Trace */
+	if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS)) {
+		unsigned int line =
+			sieve_runtime_get_source_location(renv, loop_end);
+
+		if (sieve_runtime_trace_hasflag(renv, SIEVE_TRFLG_ADDRESSES)) {
+			sieve_runtime_trace(renv, 0,
+					    "loop ends at line %d [%08llx]",
+					    line,
+					    (long long unsigned int) loop_end);
+		} else {
+			sieve_runtime_trace(renv, 0,
+					    "loop ends at line %d", line);
+		}
+	}
+
+	/* Check loop nesting limit */
+	if (!array_is_created(&interp->loop_stack))
+		p_array_init(&interp->loop_stack, interp->pool, 8);
+	if ((interp->parent_loop_level +
+	     array_count(&interp->loop_stack)) >= SIEVE_MAX_LOOP_DEPTH) {
+		/* Should normally be caught at compile time */
+		sieve_runtime_error(renv, NULL,
+				    "new program loop exceeds "
+				    "the nesting limit (<= %u levels)",
+				    SIEVE_MAX_LOOP_DEPTH);
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	/* Create new loop */
+	loop = array_append_space(&interp->loop_stack);
+	loop->level = array_count(&interp->loop_stack)-1;
+	loop->ext_def = ext_def;
+	loop->begin = interp->runenv.pc;
+	loop->end = loop_end;
+	loop->pool =  pool_alloconly_create("sieve_interpreter", 128);
+
+	/* Set new loop limit */
+	interp->loop_limit = loop_end;
+
+	*loop_r = loop;
+	return SIEVE_EXEC_OK;
+}
+
+struct sieve_interpreter_loop *
+sieve_interpreter_loop_get(struct sieve_interpreter *interp,
+			   sieve_size_t loop_end,
+			   const struct sieve_extension_def *ext_def)
+{
+	struct sieve_interpreter_loop *loops;
+	unsigned int count, i;
+
+	if (!array_is_created(&interp->loop_stack))
+		return NULL;
+
+	loops = array_get_modifiable(&interp->loop_stack, &count);
+	for (i = count; i > 0; i--) {
+		/* We're really making sure our loop matches */
+		if (loops[i-1].end == loop_end &&
+		    loops[i-1].ext_def == ext_def)
+			return &loops[i-1];
+	}
+	return NULL;
+}
+
+int sieve_interpreter_loop_next(struct sieve_interpreter *interp,
+				struct sieve_interpreter_loop *loop,
+				sieve_size_t loop_begin)
+{
+	const struct sieve_runtime_env *renv = &interp->runenv;
+	struct sieve_interpreter_loop *loops;
+	unsigned int count;
+
+	/* Trace */
+	if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS)) {
+		unsigned int line =
+			sieve_runtime_get_source_location(renv, loop_begin);
+
+		if (sieve_runtime_trace_hasflag(renv, SIEVE_TRFLG_ADDRESSES)) {
+			sieve_runtime_trace(renv, 0,
+					    "looping back to line %d [%08llx]",
+					    line,
+					    (long long unsigned int) loop_begin);
+		} else {
+			sieve_runtime_trace(renv, 0,
+					    "looping back to line %d", line);
+		}
+	}
+
+	/* Check the code for corruption */
+	if (loop->begin != loop_begin) {
+		sieve_runtime_trace_error(renv, "loop begin offset invalid");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	/* Check invariants */
+	i_assert(array_is_created(&interp->loop_stack));
+	loops = array_get_modifiable(&interp->loop_stack, &count);
+	i_assert(&loops[count-1] == loop);
+
+	/* Return to beginning */
+	interp->runenv.pc = loop_begin;
+	return SIEVE_EXEC_OK;
+}
+
+int sieve_interpreter_loop_break(struct sieve_interpreter *interp,
+				 struct sieve_interpreter_loop *loop)
+{
+	const struct sieve_runtime_env *renv = &interp->runenv;
+	struct sieve_interpreter_loop *loops;
+	sieve_size_t loop_end = loop->end;
+	unsigned int count, i;
+
+	/* Find the loop */
+	i_assert(array_is_created(&interp->loop_stack));
+	loops = array_get_modifiable(&interp->loop_stack, &count);
+	i_assert(count > 0);
+
+	i = count;
+	do {
+		pool_unref(&loops[i-1].pool);
+		i--;
+	} while (i > 0 && &loops[i] != loop);
+	i_assert(&loops[i] == loop);
+
+	/* Set new loop limit */
+	if (i > 0)
+		interp->loop_limit = loops[i].end;
+	else
+		interp->loop_limit = 0;
+
+	/* Delete it and all deeper loops */
+	array_delete(&interp->loop_stack, i, count - i);
+
+	/* Trace */
+	if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS)) {
+		unsigned int jmp_line =
+			sieve_runtime_get_source_location(renv, loop_end);
+
+		if (sieve_runtime_trace_hasflag(renv, SIEVE_TRFLG_ADDRESSES)) {
+			sieve_runtime_trace(renv, 0,
+					    "exiting loops at line %d [%08llx]",
+					    jmp_line,
+					    (long long unsigned int) loop_end);
+		} else {
+			sieve_runtime_trace(renv, 0,
+					    "exiting loops at line %d",
+					    jmp_line);
+		}
+	}
+
+	/* Exit loop */
+	interp->runenv.pc = loop->end;
+	return SIEVE_EXEC_OK;
+}
+
+static int
+sieve_interpreter_loop_break_out(struct sieve_interpreter *interp,
+				 sieve_size_t target)
+{
+	struct sieve_interpreter_loop *loops;
+	unsigned int count, i;
+
+	if (!array_is_created(&interp->loop_stack))
+		return SIEVE_EXEC_OK;
+
+	loops = array_get_modifiable(&interp->loop_stack, &count);
+	for (i = count; i > 0; i--) {
+		/* We're really making sure our loop matches */
+		if (loops[i-1].end > target)
+			break;
+	}
+	if (i == count)
+		return SIEVE_EXEC_OK;
+
+	return sieve_interpreter_loop_break(interp, &loops[i]);
+}
+
+struct sieve_interpreter_loop *
+sieve_interpreter_loop_get_local(struct sieve_interpreter *interp,
+				 struct sieve_interpreter_loop *loop,
+				 const struct sieve_extension_def *ext_def)
+{
+	struct sieve_interpreter_loop *loops;
+	unsigned int count, i;
+
+	if (!array_is_created(&interp->loop_stack))
+		return NULL;
+
+	loops = array_get_modifiable(&interp->loop_stack, &count);
+	i_assert(loop == NULL || loop->level < count);
+
+	for (i = (loop == NULL ? count : loop->level); i > 0; i--) {
+		if (ext_def == NULL || loops[i-1].ext_def == ext_def)
+			return &loops[i-1];
+	}
+	return NULL;
+}
+
+struct sieve_interpreter_loop *
+sieve_interpreter_loop_get_global(struct sieve_interpreter *interp,
+				  struct sieve_interpreter_loop *loop,
+				  const struct sieve_extension_def *ext_def)
+{
+	struct sieve_interpreter_loop *result;
+
+	while (interp != NULL) {
+		result = sieve_interpreter_loop_get_local(interp, loop,
+							  ext_def);
+		if (result != NULL)
+			return result;
+		interp = interp->parent;
+	}
+	return NULL;
+}
+
+pool_t sieve_interpreter_loop_get_pool(struct sieve_interpreter_loop *loop)
+{
+	return loop->pool;
+}
+
+void *sieve_interpreter_loop_get_context(struct sieve_interpreter_loop *loop)
+{
+	return loop->context;
+}
+
+void sieve_interpreter_loop_set_context(struct sieve_interpreter_loop *loop,
+					void *context)
+{
+	loop->context = context;
+}
+
+/*
+ * Program flow
+ */
+
+void sieve_interpreter_reset(struct sieve_interpreter *interp)
+{
+	interp->runenv.pc = interp->reset_vector;
+	interp->interrupted = FALSE;
+	interp->test_result = FALSE;
+	interp->runenv.result = NULL;
+}
+
+void sieve_interpreter_interrupt(struct sieve_interpreter *interp)
+{
+	interp->interrupted = TRUE;
+}
+
+sieve_size_t sieve_interpreter_program_counter(struct sieve_interpreter *interp)
+{
+	return interp->runenv.pc;
+}
+
+static int
+sieve_interpreter_check_program_jump(struct sieve_interpreter *interp,
+				     sieve_size_t jmp_target, bool break_loops)
+{
+	const struct sieve_runtime_env *renv = &interp->runenv;
+	sieve_size_t loop_limit = (break_loops ? 0 : interp->loop_limit);
+
+	if (jmp_target == 0 ||
+	    jmp_target > sieve_binary_block_get_size(renv->sblock) ||
+	    (loop_limit > 0 && jmp_target >= loop_limit)) {
+		if (interp->loop_limit != 0) {
+			sieve_runtime_trace_error(
+				renv, "jump target crosses loop boundary");
+		} else {
+			sieve_runtime_trace_error(
+				renv, "jump target out of range");
+		}
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+	return SIEVE_EXEC_OK;
+}
+
+static int
+sieve_interpreter_do_program_jump(struct sieve_interpreter *interp,
+				  sieve_size_t jmp_target, bool break_loops)
+{
+	const struct sieve_runtime_env *renv = &interp->runenv;
+	sieve_size_t *address = &(interp->runenv.pc);
+	int ret;
+
+	if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS)) {
+		unsigned int jmp_line =
+			sieve_runtime_get_source_location(renv, jmp_target);
+
+		if (sieve_runtime_trace_hasflag(renv, SIEVE_TRFLG_ADDRESSES)) {
+			sieve_runtime_trace(renv, 0, "jumping to line %d [%08llx]",
+					    jmp_line,
+					    (long long unsigned int)jmp_target);
+		} else {
+			sieve_runtime_trace(renv, 0, "jumping to line %d",
+					    jmp_line);
+		}
+	}
+
+	if (break_loops &&
+	    (ret = sieve_interpreter_loop_break_out(interp,
+						    jmp_target)) <= 0)
+		return ret;
+
+	*address = jmp_target;
+	return SIEVE_EXEC_OK;
+}
+
+int sieve_interpreter_program_jump_to(struct sieve_interpreter *interp,
+				      sieve_size_t jmp_target,
+				      bool break_loops)
+{
+	int ret;
+
+	ret = sieve_interpreter_check_program_jump(interp, jmp_target,
+						   break_loops);
+	if (ret <= 0)
+		return ret;
+
+	return sieve_interpreter_do_program_jump(
+		interp, jmp_target, break_loops);
+}
+
+int sieve_interpreter_program_jump(struct sieve_interpreter *interp,
+				   bool jump, bool break_loops)
+{
+	const struct sieve_runtime_env *renv = &interp->runenv;
+	sieve_size_t *address = &(interp->runenv.pc);
+	sieve_size_t jmp_start = *address, jmp_target;
+	sieve_offset_t jmp_offset;
+	int ret;
+
+	if (!sieve_binary_read_offset(renv->sblock, address, &jmp_offset)) {
+		sieve_runtime_trace_error(renv, "invalid jump offset");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+	jmp_target = jmp_start + jmp_offset;
+
+	ret = sieve_interpreter_check_program_jump(interp, jmp_target,
+						   break_loops);
+	if (ret <= 0)
+		return ret;
+
+	if (!jump) {
+		sieve_runtime_trace(renv, 0, "not jumping");
+		return SIEVE_EXEC_OK;
+	}
+
+	return sieve_interpreter_do_program_jump(
+		interp, jmp_target, break_loops);
+}
+
+/*
+ * Test results
+ */
+
+void sieve_interpreter_set_test_result(struct sieve_interpreter *interp,
+				       bool result)
+{
+	interp->test_result = result;
+}
+
+bool sieve_interpreter_get_test_result(struct sieve_interpreter *interp)
+{
+	return interp->test_result;
+}
+
+/*
+ * Code execute
+ */
+
+static int sieve_interpreter_operation_execute(struct sieve_interpreter *interp)
+{
+	struct sieve_operation *oprtn = &(interp->oprtn);
+	sieve_size_t *address = &(interp->runenv.pc);
+
+	sieve_runtime_trace_toplevel(&interp->runenv);
+
+	/* Read the operation */
+	if (sieve_operation_read(interp->runenv.sblock, address, oprtn)) {
+		const struct sieve_operation_def *op = oprtn->def;
+		int result = SIEVE_EXEC_OK;
+
+		/* Reset cached command location */
+		interp->command_line = 0;
+
+		/* Execute the operation */
+		if (op->execute != NULL) { /* Noop ? */
+			T_BEGIN {
+				result = op->execute(&(interp->runenv),
+						     address);
+			} T_END;
+		} else {
+			sieve_runtime_trace(&interp->runenv,
+					    SIEVE_TRLVL_COMMANDS,
+					    "OP: %s (NOOP)",
+					    sieve_operation_mnemonic(oprtn));
+		}
+
+		return result;
+	}
+
+	/* Binary corrupt */
+	sieve_runtime_trace_error(&interp->runenv,
+				  "Encountered invalid operation");
+	return SIEVE_EXEC_BIN_CORRUPT;
+}
+
+int sieve_interpreter_continue(struct sieve_interpreter *interp,
+			       bool *interrupted)
+{
+	const struct sieve_runtime_env *renv = &interp->runenv;
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	struct cpu_limit *climit = NULL;
+	sieve_size_t *address = &(interp->runenv.pc);
+	struct sieve_instance *svinst = eenv->svinst;
+	struct sieve_exec_status *exec_status = eenv->exec_status;
+	struct sieve_resource_usage rusage;
+	int ret = SIEVE_EXEC_OK;
+
+	sieve_result_ref(renv->result);
+	interp->interrupted = FALSE;
+
+	if (interrupted != NULL)
+		*interrupted = FALSE;
+
+	if (svinst->max_cpu_time_secs > 0) {
+		climit = cpu_limit_init(svinst->max_cpu_time_secs,
+					CPU_LIMIT_TYPE_USER);
+	}
+
+	while (ret == SIEVE_EXEC_OK && !interp->interrupted &&
+	       *address < sieve_binary_block_get_size(renv->sblock)) {
+		if (climit != NULL && cpu_limit_exceeded(climit)) {
+			sieve_runtime_error(
+				renv, NULL,
+				"execution exceeded CPU time limit");
+			ret = SIEVE_EXEC_RESOURCE_LIMIT;
+			break;
+		}
+		if (interp->loop_limit != 0 && *address > interp->loop_limit) {
+			sieve_runtime_trace_error(
+				renv, "program crossed loop boundary");
+			ret = SIEVE_EXEC_BIN_CORRUPT;
+			break;
+		}
+
+		ret = sieve_interpreter_operation_execute(interp);
+	}
+
+	if (climit != NULL) {
+		sieve_resource_usage_init(&rusage);
+		rusage.cpu_time_msecs =
+			cpu_limit_get_usage_msecs(climit, CPU_LIMIT_TYPE_USER);
+		sieve_resource_usage_add(&interp->rusage, &rusage);
+
+		cpu_limit_deinit(&climit);
+	}
+
+	if (ret != SIEVE_EXEC_OK) {
+		sieve_runtime_trace(&interp->runenv, SIEVE_TRLVL_NONE,
+				    "[[EXECUTION ABORTED]]");
+	}
+
+	if (interrupted != NULL)
+		*interrupted = interp->interrupted;
+
+	if (!interp->interrupted) {
+		exec_status->resource_usage = interp->rusage;
+
+		struct event_passthrough *e =
+			event_create_passthrough(interp->runenv.event)->
+			set_name("sieve_runtime_script_finished");
+		switch (ret) {
+		case SIEVE_EXEC_OK:
+			break;
+		case SIEVE_EXEC_FAILURE:
+			e->add_str("error", "Failed");
+			break;
+		case SIEVE_EXEC_TEMP_FAILURE:
+			e->add_str("error", "Failed temporarily");
+			break;
+		case SIEVE_EXEC_BIN_CORRUPT:
+			e->add_str("error", "Binary corrupt");
+			break;
+		case SIEVE_EXEC_RESOURCE_LIMIT:
+			e->add_str("error", "Resource limit exceeded");
+			break;
+		case SIEVE_EXEC_KEEP_FAILED:
+			/* Not supposed to occur at runtime */
+			i_unreached();
+		}
+		e_debug(e->event(), "Finished running script `%s' "
+			"(status=%s, resource usage: %s)",
+			sieve_binary_source(interp->runenv.sbin),
+			sieve_execution_exitcode_to_str(ret),
+			sieve_resource_usage_get_summary(&interp->rusage));
+		interp->running = FALSE;
+	}
+
+	sieve_result_unref(&interp->runenv.result);
+	return ret;
+}
+
+int sieve_interpreter_start(struct sieve_interpreter *interp,
+			    struct sieve_result *result, bool *interrupted)
+{
+	struct sieve_interpreter_extension_reg *eregs;
+	unsigned int ext_count, i;
+	int ret;
+
+	struct event_passthrough *e =
+		event_create_passthrough(interp->runenv.event)->
+		set_name("sieve_runtime_script_started");
+	e_debug(e->event(), "Started running script `%s'",
+		sieve_binary_source(interp->runenv.sbin));
+
+	interp->running = TRUE;
+	interp->runenv.result = result;
+	interp->runenv.msgctx = sieve_result_get_message_context(result);
+
+	sieve_resource_usage_init(&interp->rusage);
+
+	/* Signal registered extensions that the interpreter is being run */
+	eregs = array_get_modifiable(&interp->extensions, &ext_count);
+	for (i = 0; i < ext_count; i++) {
+		if (!eregs[i].deferred) {
+			eregs[i].started = TRUE;
+			if (eregs[i].intext != NULL &&
+			    eregs[i].intext->run != NULL &&
+			    (ret = eregs[i].intext->run(
+				eregs[i].ext, &interp->runenv,
+				eregs[i].context, FALSE)) <= 0)
+				return ret;
+		}
+	}
+
+	return sieve_interpreter_continue(interp, interrupted);
+}
+
+int sieve_interpreter_run(struct sieve_interpreter *interp,
+			  struct sieve_result *result)
+{
+	sieve_interpreter_reset(interp);
+
+	return sieve_interpreter_start(interp, result, NULL);
+}
+
+/*
+ * Error handling
+ */
+
+static inline void ATTR_FORMAT(3, 0)
+sieve_runtime_logv(const struct sieve_runtime_env *renv,
+		   const struct sieve_error_params *params,
+		   const char *fmt, va_list args)
+{
+	struct sieve_error_params new_params = *params;
+
+	new_params.event = renv->event;
+	T_BEGIN {
+		if (new_params.location == NULL) {
+			new_params.location =
+				sieve_runtime_get_full_command_location(renv);
+		}
+
+		sieve_logv(renv->ehandler, params, fmt, args);
+	} T_END;
+}
+
+#undef sieve_runtime_error
+void sieve_runtime_error(const struct sieve_runtime_env *renv,
+			 const char *csrc_filename, unsigned int csrc_linenum,
+			 const char *location, const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_ERROR,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+		.location = location,
+	};
+	va_list args;
+
+	va_start(args, fmt);
+	sieve_runtime_logv(renv, &params, fmt, args);
+	va_end(args);
+}
+
+#undef sieve_runtime_warning
+void sieve_runtime_warning(const struct sieve_runtime_env *renv,
+			   const char *csrc_filename, unsigned int csrc_linenum,
+			   const char *location, const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_WARNING,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+		.location = location,
+	};
+	va_list args;
+
+	va_start(args, fmt);
+	sieve_runtime_logv(renv, &params, fmt, args);
+	va_end(args);
+}
+
+#undef sieve_runtime_log
+void sieve_runtime_log(const struct sieve_runtime_env *renv,
+		       const char *csrc_filename, unsigned int csrc_linenum,
+		       const char *location, const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_INFO,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+		.location = location,
+	};
+	va_list args;
+
+	va_start(args, fmt);
+	sieve_runtime_logv(renv, &params, fmt, args);
+	va_end(args);
+}
+
+#undef sieve_runtime_critical
+void sieve_runtime_critical(const struct sieve_runtime_env *renv,
+			    const char *csrc_filename,
+			    unsigned int csrc_linenum,
+			    const char *location, const char *user_prefix,
+			    const char *fmt, ...)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_ERROR,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+		.location = location,
+	};
+	va_list args;
+
+	va_start(args, fmt);
+
+	params.event = renv->event;
+	T_BEGIN {
+		if (params.location == NULL) {
+			params.location =
+				sieve_runtime_get_full_command_location(renv);
+		}
+
+		sieve_criticalv(eenv->svinst, renv->ehandler, &params,
+				user_prefix, fmt, args);
+	} T_END;
+
+	va_end(args);
+}
+
+#undef sieve_runtime_mail_error
+int sieve_runtime_mail_error(const struct sieve_runtime_env *renv,
+			     struct mail *mail,
+			     const char *csrc_filename,
+			     unsigned int csrc_linenum,
+			     const char *fmt, ...)
+{
+	const char *error_msg, *user_prefix;
+	va_list args;
+
+	error_msg = mailbox_get_last_internal_error(mail->box, NULL);
+
+	va_start(args, fmt);
+	user_prefix = t_strdup_vprintf(fmt, args);
+	sieve_runtime_critical(renv, csrc_filename, csrc_linenum,
+			       NULL, user_prefix, "%s: %s",
+			       user_prefix, error_msg);
+	va_end(args);
+
+	return 	SIEVE_EXEC_TEMP_FAILURE;
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-interpreter.h b/pigeonhole/src/lib-sieve/sieve-interpreter.h
new file mode 100644
index 0000000..ec38029
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-interpreter.h
@@ -0,0 +1,204 @@
+#ifndef SIEVE_INTERPRETER_H
+#define SIEVE_INTERPRETER_H
+
+#include "lib.h"
+#include "array.h"
+#include "buffer.h"
+
+#include "sieve-common.h"
+#include "sieve-runtime.h"
+
+/*
+ * Interpreter
+ */
+
+struct sieve_interpreter *
+sieve_interpreter_create(struct sieve_binary *sbin,
+			 struct sieve_interpreter *parent,
+			 const struct sieve_execute_env *eenv,
+			 struct sieve_error_handler *ehandler) ATTR_NULL(2);
+struct sieve_interpreter *
+sieve_interpreter_create_for_block(struct sieve_binary_block *sblock,
+				   struct sieve_script *script,
+				   struct sieve_interpreter *parent,
+				   const struct sieve_execute_env *eenv,
+				   struct sieve_error_handler *ehandler)
+				   ATTR_NULL(3);
+void sieve_interpreter_free(struct sieve_interpreter **_interp);
+
+/*
+ * Accessors
+ */
+
+pool_t sieve_interpreter_pool(struct sieve_interpreter *interp);
+struct sieve_interpreter *
+sieve_interpreter_get_parent(struct sieve_interpreter *interp);
+struct sieve_script *sieve_interpreter_script(struct sieve_interpreter *interp);
+struct sieve_error_handler *
+sieve_interpreter_get_error_handler(struct sieve_interpreter *interp);
+struct sieve_instance *
+sieve_interpreter_svinst(struct sieve_interpreter *interp);
+
+/* Do not use this function for normal sieve extensions. This is intended for
+ * the testsuite only.
+ */
+void sieve_interpreter_set_result(struct sieve_interpreter *interp,
+				  struct sieve_result *result);
+
+/*
+ * Loop handling
+ */
+
+struct sieve_interpreter_loop;
+
+int sieve_interpreter_loop_start(struct sieve_interpreter *interp,
+				 sieve_size_t loop_end,
+				 const struct sieve_extension_def *ext_def,
+				 struct sieve_interpreter_loop **loop_r);
+struct sieve_interpreter_loop *
+sieve_interpreter_loop_get(struct sieve_interpreter *interp,
+			   sieve_size_t loop_end,
+			   const struct sieve_extension_def *ext_def);
+int sieve_interpreter_loop_next(struct sieve_interpreter *interp,
+				struct sieve_interpreter_loop *loop,
+				sieve_size_t loop_begin);
+int sieve_interpreter_loop_break(struct sieve_interpreter *interp,
+				 struct sieve_interpreter_loop *loop);
+
+struct sieve_interpreter_loop *
+sieve_interpreter_loop_get_local(struct sieve_interpreter *interp,
+				 struct sieve_interpreter_loop *loop,
+				 const struct sieve_extension_def *ext_def)
+				 ATTR_NULL(2, 3);
+struct sieve_interpreter_loop *
+sieve_interpreter_loop_get_global(struct sieve_interpreter *interp,
+				  struct sieve_interpreter_loop *loop,
+				  const struct sieve_extension_def *ext_def)
+				  ATTR_NULL(2, 3);
+
+pool_t sieve_interpreter_loop_get_pool(struct sieve_interpreter_loop *loop)
+				       ATTR_PURE;
+void *sieve_interpreter_loop_get_context(struct sieve_interpreter_loop *loop)
+					 ATTR_PURE;
+void sieve_interpreter_loop_set_context(struct sieve_interpreter_loop *loop,
+					void *context);
+
+/*
+ * Program flow
+ */
+
+void sieve_interpreter_reset(struct sieve_interpreter *interp);
+void sieve_interpreter_interrupt(struct sieve_interpreter *interp);
+sieve_size_t
+sieve_interpreter_program_counter(struct sieve_interpreter *interp);
+
+int sieve_interpreter_program_jump_to(struct sieve_interpreter *interp,
+				      sieve_size_t jmp_target,
+				      bool break_loops);
+int sieve_interpreter_program_jump(struct sieve_interpreter *interp, bool jump,
+				   bool break_loops);
+
+/*
+ * Test results
+ */
+
+void sieve_interpreter_set_test_result(struct sieve_interpreter *interp,
+				       bool result);
+bool sieve_interpreter_get_test_result(struct sieve_interpreter *interp);
+
+/*
+ * Source location
+ */
+
+unsigned int
+sieve_runtime_get_source_location(const struct sieve_runtime_env *renv,
+				  sieve_size_t code_address);
+
+unsigned int
+sieve_runtime_get_command_location(const struct sieve_runtime_env *renv);
+const char *
+sieve_runtime_get_full_command_location(const struct sieve_runtime_env *renv);
+
+/*
+ * Extension support
+ */
+
+struct sieve_interpreter_extension {
+	const struct sieve_extension_def *ext_def;
+
+	int (*run)(const struct sieve_extension *ext,
+		   const struct sieve_runtime_env *renv,
+		   void *context, bool deferred);
+	void (*free)(const struct sieve_extension *ext,
+		     struct sieve_interpreter *interp, void *context);
+};
+
+void sieve_interpreter_extension_register(
+	struct sieve_interpreter *interp, const struct sieve_extension *ext,
+	const struct sieve_interpreter_extension *intext, void *context);
+void sieve_interpreter_extension_set_context(
+	struct sieve_interpreter *interp, const struct sieve_extension *ext,
+	void *context);
+void *sieve_interpreter_extension_get_context(
+	struct sieve_interpreter *interp, const struct sieve_extension *ext);
+
+int sieve_interpreter_extension_start(struct sieve_interpreter *interp,
+				      const struct sieve_extension *ext);
+
+/*
+ * Opcodes and operands
+ */
+
+int sieve_interpreter_handle_optional_operands(
+	const struct sieve_runtime_env *renv, sieve_size_t *address,
+	struct sieve_side_effects_list **list);
+
+/*
+ * Code execute
+ */
+
+int sieve_interpreter_continue(struct sieve_interpreter *interp,
+			       bool *interrupted);
+int sieve_interpreter_start(struct sieve_interpreter *interp,
+			    struct sieve_result *result, bool *interrupted);
+int sieve_interpreter_run(struct sieve_interpreter *interp,
+			  struct sieve_result *result);
+
+/*
+ * Error handling
+ */
+
+void sieve_runtime_error(const struct sieve_runtime_env *renv,
+			 const char *csrc_filename, unsigned int csrc_linenum,
+			 const char *location, const char *fmt, ...)
+			 ATTR_FORMAT(5, 6);
+#define sieve_runtime_error(renv, ...) \
+	sieve_runtime_error(renv, __FILE__, __LINE__, __VA_ARGS__)
+void sieve_runtime_warning(const struct sieve_runtime_env *renv,
+			   const char *csrc_filename, unsigned int csrc_linenum,
+			   const char *location, const char *fmt, ...)
+			   ATTR_FORMAT(5, 6);
+#define sieve_runtime_warning(renv, ...) \
+	sieve_runtime_warning(renv, __FILE__, __LINE__, __VA_ARGS__)
+void sieve_runtime_log(const struct sieve_runtime_env *renv,
+		       const char *csrc_filename, unsigned int csrc_linenum,
+		       const char *location, const char *fmt, ...)
+		       ATTR_FORMAT(5, 6);
+#define sieve_runtime_log(renv, ...) \
+	sieve_runtime_log(renv, __FILE__, __LINE__, __VA_ARGS__)
+void sieve_runtime_critical(const struct sieve_runtime_env *renv,
+			    const char *csrc_filename,
+			    unsigned int csrc_linenum,
+			    const char *location, const char *user_prefix,
+			    const char *fmt, ...) ATTR_FORMAT(6, 7);
+#define sieve_runtime_critical(renv, ...) \
+	sieve_runtime_critical(renv, __FILE__, __LINE__, __VA_ARGS__)
+int sieve_runtime_mail_error(const struct sieve_runtime_env *renv,
+			     struct mail *mail, 
+			     const char *csrc_filename,
+			     unsigned int csrc_linenum,
+			     const char *fmt, ...) ATTR_FORMAT(5, 6);
+#define sieve_runtime_mail_error(renv, mail, ...) \
+	sieve_runtime_mail_error(renv, mail, __FILE__, __LINE__, __VA_ARGS__)
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-lexer.c b/pigeonhole/src/lib-sieve/sieve-lexer.c
new file mode 100644
index 0000000..a6968a9
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-lexer.c
@@ -0,0 +1,930 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "compat.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "istream.h"
+
+#include "sieve-common.h"
+#include "sieve-limits.h"
+#include "sieve-error.h"
+#include "sieve-script.h"
+
+#include "sieve-lexer.h"
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <ctype.h>
+
+/*
+ * Useful macros
+ */
+
+#define DIGIT_VAL(c) (c - '0')
+
+/*
+ * Lexer object
+ */
+
+struct sieve_lexical_scanner {
+	pool_t pool;
+	struct sieve_instance *svinst;
+
+	struct sieve_script *script;
+	struct istream *input;
+
+	struct sieve_error_handler *ehandler;
+
+	/* Currently scanned data */
+	const unsigned char *buffer;
+	size_t buffer_size;
+	size_t buffer_pos;
+
+	struct sieve_lexer lexer;
+
+	int current_line;
+};
+
+const struct sieve_lexer *
+sieve_lexer_create(struct sieve_script *script,
+		   struct sieve_error_handler *ehandler,
+		   enum sieve_error *error_r)
+{
+	struct sieve_lexical_scanner *scanner;
+	struct sieve_instance *svinst = sieve_script_svinst(script);
+	struct istream *stream;
+	const struct stat *st;
+
+	/* Open script as stream */
+	if (sieve_script_get_stream(script, &stream, error_r) < 0)
+		return NULL;
+
+	/* Check script size */
+	if (i_stream_stat(stream, TRUE, &st) >= 0 && st->st_size > 0 &&
+	    svinst->max_script_size > 0 &&
+	    (uoff_t)st->st_size > svinst->max_script_size) {
+		sieve_error(ehandler, sieve_script_name(script),
+			"sieve script is too large (max %zu bytes)",
+			svinst->max_script_size);
+		if (error_r != NULL)
+			*error_r = SIEVE_ERROR_NOT_POSSIBLE;
+		return NULL;
+	}
+
+	scanner = i_new(struct sieve_lexical_scanner, 1);
+	scanner->lexer.scanner = scanner;
+
+	scanner->ehandler = ehandler;
+	sieve_error_handler_ref(ehandler);
+
+	scanner->input = stream;
+	i_stream_ref(scanner->input);
+
+	scanner->script = script;
+	sieve_script_ref(script);
+
+	scanner->buffer = NULL;
+	scanner->buffer_size = 0;
+	scanner->buffer_pos = 0;
+
+	scanner->lexer.token_type = STT_NONE;
+	scanner->lexer.token_str_value = str_new(default_pool, 256);
+	scanner->lexer.token_int_value = 0;
+	scanner->lexer.token_line = 1;
+
+	scanner->current_line = 1;
+
+	return &scanner->lexer;
+}
+
+void sieve_lexer_free(const struct sieve_lexer **_lexer)
+{
+	const struct sieve_lexer *lexer = *_lexer;
+	struct sieve_lexical_scanner *scanner = lexer->scanner;
+
+	i_stream_unref(&scanner->input);
+	sieve_script_unref(&scanner->script);
+	sieve_error_handler_unref(&scanner->ehandler);
+	str_free(&scanner->lexer.token_str_value);
+
+	i_free(scanner);
+	*_lexer = NULL;
+}
+
+/*
+ * Internal error handling
+ */
+
+inline static void ATTR_FORMAT(4, 5)
+sieve_lexer_error(const struct sieve_lexer *lexer,
+		  const char *csrc_filename, unsigned int csrc_linenum,
+		  const char *fmt, ...)
+{
+	struct sieve_lexical_scanner *scanner = lexer->scanner;
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_ERROR,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+	};
+	va_list args;
+
+	va_start(args, fmt);
+
+	T_BEGIN {
+		params.location =
+			sieve_error_script_location(scanner->script,
+						    scanner->current_line);
+		sieve_logv(scanner->ehandler, &params, fmt, args);
+	} T_END;
+
+	va_end(args);
+}
+#define sieve_lexer_error(lexer, ...) \
+	sieve_lexer_error(lexer, __FILE__, __LINE__, __VA_ARGS__)
+
+inline static void ATTR_FORMAT(4, 5)
+sieve_lexer_warning(const struct sieve_lexer *lexer,
+		    const char *csrc_filename, unsigned int csrc_linenum,
+		    const char *fmt, ...)
+{
+	struct sieve_lexical_scanner *scanner = lexer->scanner;
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_WARNING,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+	};
+	va_list args;
+
+	va_start(args, fmt);
+
+	T_BEGIN {
+		params.location =
+			sieve_error_script_location(scanner->script,
+						    scanner->current_line);
+		sieve_logv(scanner->ehandler, &params, fmt, args);
+	} T_END;
+
+	va_end(args);
+}
+#define sieve_lexer_warning(lexer, ...) \
+	sieve_lexer_warning(lexer, __FILE__, __LINE__, __VA_ARGS__)
+
+const char *sieve_lexer_token_description(const struct sieve_lexer *lexer)
+{
+	switch (lexer->token_type) {
+	case STT_NONE:
+		return "no token (bug)";
+	case STT_WHITESPACE:
+		return "whitespace (bug)";
+	case STT_EOF:
+		return "end of file";
+
+	case STT_NUMBER:
+		return "number";
+	case STT_IDENTIFIER:
+		return "identifier";
+	case STT_TAG:
+		return "tag";
+	case STT_STRING:
+		return "string";
+
+	case STT_RBRACKET:
+		return "')'";
+	case STT_LBRACKET:
+		return "'('";
+	case STT_RCURLY:
+		return "'}'";
+	case STT_LCURLY:
+		return "'{'";
+	case STT_RSQUARE:
+		return "']'";
+	case STT_LSQUARE:
+		return "'['";
+	case STT_SEMICOLON:
+		return "';'";
+	case STT_COMMA:
+		return "','";
+
+	case STT_SLASH:
+		return "'/'";
+	case STT_COLON:
+		return "':'";
+
+	case STT_GARBAGE:
+		return "unknown characters";
+	case STT_ERROR:
+		return "error token (bug)";
+	}
+
+	return "unknown token (bug)";
+}
+
+/*
+ * Debug
+ */
+
+void sieve_lexer_token_print(const struct sieve_lexer *lexer)
+{
+	switch (lexer->token_type) {
+	case STT_NONE:
+		printf("??NONE?? ");
+		break;
+	case STT_WHITESPACE:
+		printf("??WHITESPACE?? ");
+		break;
+	case STT_EOF:
+		printf("EOF\n");
+		break;
+
+	case STT_NUMBER:
+		printf("NUMBER ");
+		break;
+	case STT_IDENTIFIER:
+		printf("IDENTIFIER ");
+		break;
+	case STT_TAG:
+		printf("TAG ");
+		break;
+	case STT_STRING:
+		printf("STRING ");
+		break;
+
+	case STT_RBRACKET:
+		printf(") ");
+		break;
+	case STT_LBRACKET:
+		printf("( ");
+		break;
+	case STT_RCURLY:
+		printf("}\n");
+		break;
+	case STT_LCURLY:
+		printf("{\n");
+		break;
+	case STT_RSQUARE:
+		printf("] ");
+		break;
+	case STT_LSQUARE:
+		printf("[ ");
+		break;
+	case STT_SEMICOLON:
+		printf(";\n");
+		break;
+	case STT_COMMA:
+		printf(", ");
+		break;
+
+	case STT_SLASH:
+		printf("/ ");
+		break;
+	case STT_COLON:
+		printf(": ");
+		break;
+
+	case STT_GARBAGE:
+		printf(">>GARBAGE<<");
+		break;
+	case STT_ERROR:
+		printf(">>ERROR<<");
+		break;
+	default:
+		printf("UNKNOWN ");
+		break;
+	}
+}
+
+/*
+ * Lexical scanning
+ */
+
+static void sieve_lexer_shift(struct sieve_lexical_scanner *scanner)
+{
+	if (scanner->buffer_size > 0 &&
+	    scanner->buffer[scanner->buffer_pos] == '\n')
+		scanner->current_line++;
+
+	if (scanner->buffer_size > 0 &&
+	    scanner->buffer_pos + 1 < scanner->buffer_size)
+		scanner->buffer_pos++;
+	else {
+		if (scanner->buffer_size > 0)
+			i_stream_skip(scanner->input, scanner->buffer_size);
+
+		scanner->buffer = i_stream_get_data(scanner->input,
+						    &scanner->buffer_size);
+
+		if (scanner->buffer_size == 0 &&
+		    i_stream_read(scanner->input) > 0) {
+	  		scanner->buffer = i_stream_get_data(
+				scanner->input, &scanner->buffer_size);
+		}
+
+		scanner->buffer_pos = 0;
+	}
+}
+
+static inline int sieve_lexer_curchar(struct sieve_lexical_scanner *scanner)
+{
+	if (scanner->buffer_size == 0)
+		return -1;
+
+	return scanner->buffer[scanner->buffer_pos];
+}
+
+static inline const char *_char_sanitize(int ch)
+{
+	if (ch > 31 && ch < 127)
+		return t_strdup_printf("'%c'", ch);
+
+	return t_strdup_printf("0x%02x", ch);
+}
+
+static bool sieve_lexer_scan_number(struct sieve_lexical_scanner *scanner)
+{
+	struct sieve_lexer *lexer = &scanner->lexer;
+	uintmax_t value;
+	string_t *str;
+	bool overflow = FALSE;
+
+	str_truncate(lexer->token_str_value,0);
+	str = lexer->token_str_value;
+
+	while (i_isdigit(sieve_lexer_curchar(scanner))) {
+		str_append_c(str, sieve_lexer_curchar(scanner));
+		sieve_lexer_shift(scanner);
+	}
+
+	if (str_to_uintmax(str_c(str), &value) < 0 ||
+	    value > (sieve_number_t)-1) {
+		overflow = TRUE;
+	} else {
+		switch (sieve_lexer_curchar(scanner)) {
+		case 'k':
+		case 'K': /* Kilo */
+			if (value > (SIEVE_MAX_NUMBER >> 10))
+				overflow = TRUE;
+			else
+				value = value << 10;
+			sieve_lexer_shift(scanner);
+			break;
+		case 'm':
+		case 'M': /* Mega */
+			if (value > (SIEVE_MAX_NUMBER >> 20))
+				overflow = TRUE;
+			else
+				value = value << 20;
+			sieve_lexer_shift(scanner);
+			break;
+		case 'g':
+		case 'G': /* Giga */
+			if (value > (SIEVE_MAX_NUMBER >> 30))
+				overflow = TRUE;
+			else
+				value = value << 30;
+			sieve_lexer_shift(scanner);
+			break;
+		default:
+			/* Next token */
+			break;
+		}
+	}
+
+	/* Check for integer overflow */
+	if (overflow) {
+		sieve_lexer_error(lexer,
+				  "number exceeds integer limits (max %llu)",
+				  (long long) SIEVE_MAX_NUMBER);
+		lexer->token_type = STT_ERROR;
+		return FALSE;
+	}
+
+	lexer->token_type = STT_NUMBER;
+	lexer->token_int_value = (sieve_number_t)value;
+	return TRUE;
+
+}
+
+static bool
+sieve_lexer_scan_hash_comment(struct sieve_lexical_scanner *scanner)
+{
+	struct sieve_lexer *lexer = &scanner->lexer;
+
+	while (sieve_lexer_curchar(scanner) != '\n') {
+		switch(sieve_lexer_curchar(scanner)) {
+		case -1:
+			if (!scanner->input->eof) {
+				lexer->token_type = STT_ERROR;
+				return FALSE;
+			}
+			sieve_lexer_warning(lexer,
+				"no newline (CRLF) at end of hash comment at end of file");
+			lexer->token_type = STT_WHITESPACE;
+			return TRUE;
+		case '\0':
+			sieve_lexer_error(lexer,
+					  "encountered NUL character in hash comment");
+			lexer->token_type = STT_ERROR;
+			return FALSE;
+		default:
+			break;
+		}
+
+		/* Stray CR is ignored */
+		sieve_lexer_shift(scanner);
+	}
+
+	sieve_lexer_shift(scanner);
+
+	lexer->token_type = STT_WHITESPACE;
+	return TRUE;
+}
+
+/* sieve_lexer_scan_raw_token:
+ *   Scans valid tokens and whitespace
+ */
+static bool
+sieve_lexer_scan_raw_token(struct sieve_lexical_scanner *scanner)
+{
+	struct sieve_lexer *lexer = &scanner->lexer;
+	string_t *str;
+	int ret;
+
+	/* Read first character */
+	if (lexer->token_type == STT_NONE) {
+		if ((ret = i_stream_read(scanner->input)) < 0) {
+			i_assert(ret != -2);
+			if (!scanner->input->eof) {
+				lexer->token_type = STT_ERROR;
+				return FALSE;
+			}
+		}
+		sieve_lexer_shift(scanner);
+	}
+
+	lexer->token_line = scanner->current_line;
+
+	switch (sieve_lexer_curchar(scanner)) {
+
+	/* whitespace */
+
+	// hash-comment = ( "#" *CHAR-NOT-CRLF CRLF )
+	case '#':
+		sieve_lexer_shift(scanner);
+		return sieve_lexer_scan_hash_comment(scanner);
+
+	// bracket-comment = "/*" *(CHAR-NOT-STAR / ("*" CHAR-NOT-SLASH)) "*/"
+	//        ;; No */ allowed inside a comment.
+	//        ;; (No * is allowed unless it is the last character,
+	//        ;; or unless it is followed by a character that isn't a
+	//        ;; slash.)
+	case '/':
+		sieve_lexer_shift(scanner);
+
+		if (sieve_lexer_curchar(scanner) == '*') {
+			sieve_lexer_shift(scanner);
+
+			while (TRUE) {
+				switch (sieve_lexer_curchar(scanner)) {
+				case -1:
+					if (scanner->input->eof) {
+						sieve_lexer_error(lexer,
+							"end of file before end of bracket comment "
+							"('/* ... */') "
+							"started at line %d",
+							lexer->token_line);
+					}
+					lexer->token_type = STT_ERROR;
+					return FALSE;
+				case '*':
+					sieve_lexer_shift(scanner);
+
+					if (sieve_lexer_curchar(scanner) == '/') {
+						sieve_lexer_shift(scanner);
+
+						lexer->token_type = STT_WHITESPACE;
+						return TRUE;
+
+					} else if (sieve_lexer_curchar(scanner) == -1) {
+						sieve_lexer_error(lexer,
+							"end of file before end of bracket comment "
+							"('/* ... */') "
+							"started at line %d",
+							lexer->token_line);
+						lexer->token_type = STT_ERROR;
+						return FALSE;
+					}
+					break;
+				case '\0':
+					sieve_lexer_error(lexer,
+						"encountered NUL character in bracket comment");
+					lexer->token_type = STT_ERROR;
+					return FALSE;
+				default:
+					sieve_lexer_shift(scanner);
+				}
+			}
+
+			i_unreached();
+			return FALSE;
+		}
+
+		lexer->token_type = STT_SLASH;
+		return TRUE;
+
+	// comment = bracket-comment / hash-comment
+	// white-space = 1*(SP / CRLF / HTAB) / comment
+	case '\t':
+	case '\r':
+	case '\n':
+	case ' ':
+		sieve_lexer_shift(scanner);
+
+		while (sieve_lexer_curchar(scanner) == '\t' ||
+		       sieve_lexer_curchar(scanner) == '\r' ||
+		       sieve_lexer_curchar(scanner) == '\n' ||
+		       sieve_lexer_curchar(scanner) == ' ') {
+
+			sieve_lexer_shift(scanner);
+		}
+
+		lexer->token_type = STT_WHITESPACE;
+		return TRUE;
+
+	/* quoted-string */
+	case '"':
+		sieve_lexer_shift(scanner);
+
+		str_truncate(lexer->token_str_value, 0);
+		str = lexer->token_str_value;
+
+		while (sieve_lexer_curchar(scanner) != '"') {
+			if (sieve_lexer_curchar(scanner) == '\\')
+				sieve_lexer_shift(scanner);
+
+			switch (sieve_lexer_curchar(scanner)) {
+
+			/* End of file */
+			case -1:
+				if (scanner->input->eof) {
+					sieve_lexer_error(lexer,
+						"end of file before end of quoted string "
+						"started at line %d", lexer->token_line);
+				}
+				lexer->token_type = STT_ERROR;
+				return FALSE;
+
+			/* NUL character */
+			case '\0':
+				sieve_lexer_error(lexer,
+					"encountered NUL character in quoted string "
+					"started at line %d", lexer->token_line);
+				lexer->token_type = STT_ERROR;
+				return FALSE;
+
+			/* CR .. check for LF */
+			case '\r':
+				sieve_lexer_shift(scanner);
+
+				if (sieve_lexer_curchar(scanner) != '\n') {
+					sieve_lexer_error(lexer,
+						"found stray carriage-return (CR) character "
+						"in quoted string started at line %d",
+						lexer->token_line);
+					lexer->token_type = STT_ERROR;
+					return FALSE;
+				}
+
+				if (str_len(str) <= SIEVE_MAX_STRING_LEN)
+					str_append(str, "\r\n");
+				break;
+
+			/* Loose LF is allowed (non-standard) and converted to CRLF */
+			case '\n':
+				if (str_len(str) <= SIEVE_MAX_STRING_LEN)
+					str_append(str, "\r\n");
+				break;
+
+			/* Other characters */
+			default:
+				if (str_len(str) <= SIEVE_MAX_STRING_LEN)
+					str_append_c(str, sieve_lexer_curchar(scanner));
+			}
+
+			sieve_lexer_shift(scanner);
+		}
+
+		sieve_lexer_shift(scanner);
+
+		if (str_len(str) > SIEVE_MAX_STRING_LEN) {
+			sieve_lexer_error(lexer,
+				"quoted string started at line %d is too long "
+				"(longer than %llu bytes)", lexer->token_line,
+				(long long) SIEVE_MAX_STRING_LEN);
+			lexer->token_type = STT_ERROR;
+			return FALSE;
+		}
+
+		lexer->token_type = STT_STRING;
+		return TRUE;
+
+	/* single character tokens */
+	case ']':
+		sieve_lexer_shift(scanner);
+		lexer->token_type = STT_RSQUARE;
+		return TRUE;
+	case '[':
+		sieve_lexer_shift(scanner);
+		lexer->token_type = STT_LSQUARE;
+		return TRUE;
+	case '}':
+		sieve_lexer_shift(scanner);
+		lexer->token_type = STT_RCURLY;
+		return TRUE;
+	case '{':
+		sieve_lexer_shift(scanner);
+		lexer->token_type = STT_LCURLY;
+		return TRUE;
+	case ')':
+		sieve_lexer_shift(scanner);
+		lexer->token_type = STT_RBRACKET;
+		return TRUE;
+	case '(':
+		sieve_lexer_shift(scanner);
+		lexer->token_type = STT_LBRACKET;
+		return TRUE;
+	case ';':
+		sieve_lexer_shift(scanner);
+		lexer->token_type = STT_SEMICOLON;
+		return TRUE;
+	case ',':
+		sieve_lexer_shift(scanner);
+		lexer->token_type = STT_COMMA;
+		return TRUE;
+
+	/* EOF */
+	case -1:
+		if (!scanner->input->eof) {
+			lexer->token_type = STT_ERROR;
+			return FALSE;
+		}
+		lexer->token_type = STT_EOF;
+		return TRUE;
+
+	default:
+		/* number */
+		if (i_isdigit(sieve_lexer_curchar(scanner))) {
+			return sieve_lexer_scan_number(scanner);
+
+		/* identifier / tag */
+		} else if (i_isalpha(sieve_lexer_curchar(scanner)) ||
+			   sieve_lexer_curchar(scanner) == '_' ||
+			   sieve_lexer_curchar(scanner) == ':') {
+
+			enum sieve_token_type type = STT_IDENTIFIER;
+			str_truncate(lexer->token_str_value,0);
+			str = lexer->token_str_value;
+
+			/* If it starts with a ':' it is a tag and not an
+			   identifier */
+ 			if (sieve_lexer_curchar(scanner) == ':') {
+				sieve_lexer_shift(scanner); // discard colon
+				type = STT_TAG;
+
+				/* First character still can't be a DIGIT */
+ 				if (i_isalpha(sieve_lexer_curchar(scanner)) ||
+				    sieve_lexer_curchar(scanner) == '_') {
+					str_append_c(str, sieve_lexer_curchar(scanner));
+					sieve_lexer_shift(scanner);
+				} else {
+					/* Hmm, otherwise it is just a spurious
+					   colon */
+					lexer->token_type = STT_COLON;
+					return TRUE;
+				}
+			} else {
+				str_append_c(str, sieve_lexer_curchar(scanner));
+				sieve_lexer_shift(scanner);
+			}
+
+			/* Scan the rest of the identifier */
+			while (i_isalnum(sieve_lexer_curchar(scanner)) ||
+			       sieve_lexer_curchar(scanner) == '_') {
+
+				if (str_len(str) <= SIEVE_MAX_IDENTIFIER_LEN) {
+	 				str_append_c(str, sieve_lexer_curchar(scanner));
+				}
+				sieve_lexer_shift(scanner);
+			}
+
+			/* Is this in fact a multiline text string ? */
+			if (sieve_lexer_curchar(scanner) == ':' &&
+			    type == STT_IDENTIFIER && str_len(str) == 4 &&
+			    strncasecmp(str_c(str), "text", 4) == 0) {
+				sieve_lexer_shift(scanner); // discard colon
+
+				/* Discard SP and HTAB whitespace */
+				while (sieve_lexer_curchar(scanner) == ' ' ||
+				       sieve_lexer_curchar(scanner) == '\t')
+ 					sieve_lexer_shift(scanner);
+
+				/* Discard hash comment or handle single CRLF */
+				if (sieve_lexer_curchar(scanner) == '\r')
+					sieve_lexer_shift(scanner);
+ 				switch (sieve_lexer_curchar(scanner)) {
+				case '#':
+					if (!sieve_lexer_scan_hash_comment(scanner))
+						return FALSE;
+					if (scanner->input->eof) {
+						sieve_lexer_error(lexer,
+							"end of file before end of multi-line string");
+						lexer->token_type = STT_ERROR;
+						return FALSE;
+					} else if (scanner->input->stream_errno != 0) {
+						lexer->token_type = STT_ERROR;
+						return FALSE;
+					}
+					break;
+				case '\n':
+					sieve_lexer_shift(scanner);
+					break;
+				case -1:
+					if (scanner->input->eof) {
+						sieve_lexer_error(lexer,
+							"end of file before end of multi-line string");
+					}
+					lexer->token_type = STT_ERROR;
+					return FALSE;
+				default:
+ 					sieve_lexer_error(lexer,
+ 						"invalid character %s after 'text:' in multiline string",
+						_char_sanitize(sieve_lexer_curchar(scanner)));
+					lexer->token_type = STT_ERROR;
+					return FALSE;
+				}
+
+				/* Start over */
+				str_truncate(str, 0);
+
+ 				/* Parse literal lines */
+				while (TRUE) {
+					bool cr_shifted = FALSE;
+
+					/* Remove dot-stuffing or detect end of text */
+					if (sieve_lexer_curchar(scanner) == '.') {
+						sieve_lexer_shift(scanner);
+
+						/* Check for CR.. */
+						if (sieve_lexer_curchar(scanner) == '\r') {
+							sieve_lexer_shift(scanner);
+							cr_shifted = TRUE;
+						}
+
+						/* ..LF */
+						if (sieve_lexer_curchar(scanner) == '\n') {
+							sieve_lexer_shift(scanner);
+
+							/* End of multi-line string */
+
+							/* Check whether length limit was violated */
+							if (str_len(str) > SIEVE_MAX_STRING_LEN) {
+								sieve_lexer_error(lexer,
+									"multi-line string started at line %d is too long "
+									"(longer than %llu bytes)", lexer->token_line,
+									(long long) SIEVE_MAX_STRING_LEN);
+									lexer->token_type = STT_ERROR;
+									return FALSE;
+							}
+
+							lexer->token_type = STT_STRING;
+							return TRUE;
+						} else if (cr_shifted) {
+							/* Seen CR, but no LF */
+							if (sieve_lexer_curchar(scanner) != -1 ||
+							    !scanner->input->eof) {
+								sieve_lexer_error(lexer,
+									"found stray carriage-return (CR) character "
+									"in multi-line string started at line %d",
+									lexer->token_line);
+							}
+							lexer->token_type = STT_ERROR;
+							return FALSE;
+						}
+
+						/* Handle dot-stuffing */
+						if (str_len(str) <= SIEVE_MAX_STRING_LEN)
+							str_append_c(str, '.');
+						if (sieve_lexer_curchar(scanner) == '.')
+							sieve_lexer_shift(scanner);
+					}
+
+					/* Scan the rest of the line */
+					while (sieve_lexer_curchar(scanner) != '\n' &&
+					       sieve_lexer_curchar(scanner) != '\r') {
+
+						switch (sieve_lexer_curchar(scanner)) {
+						case -1:
+							if (scanner->input->eof) {
+								sieve_lexer_error(lexer,
+									"end of file before end of multi-line string");
+							}
+ 							lexer->token_type = STT_ERROR;
+ 							return FALSE;
+						case '\0':
+							sieve_lexer_error(lexer,
+								"encountered NUL character in quoted string "
+								"started at line %d", lexer->token_line);
+							lexer->token_type = STT_ERROR;
+							return FALSE;
+						default:
+							if (str_len(str) <= SIEVE_MAX_STRING_LEN)
+  								str_append_c(str, sieve_lexer_curchar(scanner));
+						}
+
+						sieve_lexer_shift(scanner);
+					}
+
+					/* If exited loop due to CR, skip it */
+					if (sieve_lexer_curchar(scanner) == '\r')
+						sieve_lexer_shift(scanner);
+
+					/* Now we must see an LF */
+					if (sieve_lexer_curchar(scanner) != '\n') {
+						if (sieve_lexer_curchar(scanner) != -1 ||
+						    !scanner->input->eof) {
+							sieve_lexer_error(lexer,
+								"found stray carriage-return (CR) character "
+								"in multi-line string started at line %d",
+								lexer->token_line);
+						}
+ 						lexer->token_type = STT_ERROR;
+ 						return FALSE;
+					}
+
+					if (str_len(str) <= SIEVE_MAX_STRING_LEN)
+						str_append(str, "\r\n");
+
+					sieve_lexer_shift(scanner);
+				}
+
+ 				i_unreached();
+				lexer->token_type = STT_ERROR;
+				return FALSE;
+			}
+
+			if (str_len(str) > SIEVE_MAX_IDENTIFIER_LEN) {
+				sieve_lexer_error(lexer,
+					"encountered impossibly long %s%s'",
+					(type == STT_TAG ? "tag identifier ':" :
+					 "identifier '"),
+					str_sanitize(str_c(str),
+						     SIEVE_MAX_IDENTIFIER_LEN));
+				lexer->token_type = STT_ERROR;
+				return FALSE;
+			}
+
+			lexer->token_type = type;
+			return TRUE;
+		}
+
+		/* Error (unknown character and EOF handled already) */
+		if (lexer->token_type != STT_GARBAGE) {
+			sieve_lexer_error(lexer,
+				"unexpected character(s) starting with %s",
+				_char_sanitize(sieve_lexer_curchar(scanner)));
+		}
+		sieve_lexer_shift(scanner);
+		lexer->token_type = STT_GARBAGE;
+		return FALSE;
+	}
+}
+
+void sieve_lexer_skip_token(const struct sieve_lexer *lexer)
+{
+	/* Scan token while skipping whitespace */
+	do {
+		struct sieve_lexical_scanner *scanner = lexer->scanner;
+
+		if (!sieve_lexer_scan_raw_token(scanner)) {
+			if (!scanner->input->eof &&
+			    scanner->input->stream_errno != 0) {
+				sieve_critical(scanner->svinst, scanner->ehandler,
+					sieve_error_script_location(scanner->script,
+								    scanner->current_line),
+					"error reading script",
+					"error reading script during lexical analysis: %s",
+					i_stream_get_error(scanner->input));
+			}
+			return;
+		}
+	} while (lexer->token_type == STT_WHITESPACE);
+}
+
diff --git a/pigeonhole/src/lib-sieve/sieve-lexer.h b/pigeonhole/src/lib-sieve/sieve-lexer.h
new file mode 100644
index 0000000..95451cc
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-lexer.h
@@ -0,0 +1,119 @@
+#ifndef SIEVE_LEXER_H
+#define SIEVE_LEXER_H
+
+#include "lib.h"
+#include "str.h"
+
+#include "sieve-common.h"
+
+enum sieve_token_type {
+	STT_NONE,
+	STT_WHITESPACE,
+	STT_EOF,
+
+	STT_NUMBER,
+	STT_IDENTIFIER,
+	STT_TAG,
+	STT_STRING,
+
+	STT_RBRACKET,
+	STT_LBRACKET,
+	STT_RCURLY,
+	STT_LCURLY,
+	STT_RSQUARE,
+	STT_LSQUARE,
+	STT_SEMICOLON,
+	STT_COMMA,
+
+	/* These are currently not used in the lexical specification, but a
+	   token is assigned to these to generate proper error messages (these
+	   are technically not garbage and possibly part of mistyped but
+	   otherwise valid tokens).
+	 */
+	STT_SLASH,
+	STT_COLON,
+
+	/* Error tokens */
+	STT_GARBAGE, /* Error reporting deferred to parser */
+	STT_ERROR    /* Lexer is responsible for error, parser won't report
+	                additional errors */
+};
+
+/*
+ * Lexer object
+ */
+
+struct sieve_lexical_scanner;
+
+struct sieve_lexer {
+	struct sieve_lexical_scanner *scanner;
+
+	enum sieve_token_type token_type;
+	string_t *token_str_value;
+	sieve_number_t token_int_value;
+
+	int token_line;
+};
+
+const struct sieve_lexer *
+sieve_lexer_create(struct sieve_script *script,
+		   struct sieve_error_handler *ehandler,
+		   enum sieve_error *error_r);
+void sieve_lexer_free(const struct sieve_lexer **lexer);
+
+/*
+ * Scanning
+ */
+
+void sieve_lexer_skip_token(const struct sieve_lexer *lexer);
+
+/*
+ * Token access
+ */
+
+static inline enum sieve_token_type
+sieve_lexer_token_type(const struct sieve_lexer *lexer)
+{
+	return lexer->token_type;
+}
+
+static inline const string_t *
+sieve_lexer_token_str(const struct sieve_lexer *lexer)
+{
+	i_assert(lexer->token_type == STT_STRING);
+
+	return lexer->token_str_value;
+}
+
+static inline const char *
+sieve_lexer_token_ident(const struct sieve_lexer *lexer)
+{
+	i_assert(lexer->token_type == STT_TAG ||
+		 lexer->token_type == STT_IDENTIFIER);
+
+	return str_c(lexer->token_str_value);
+}
+
+static inline sieve_number_t
+sieve_lexer_token_int(const struct sieve_lexer *lexer)
+{
+	i_assert(lexer->token_type == STT_NUMBER);
+
+	return lexer->token_int_value;
+}
+
+static inline bool sieve_lexer_eof(const struct sieve_lexer *lexer)
+{
+	return lexer->token_type == STT_EOF;
+}
+
+static inline int sieve_lexer_token_line(const struct sieve_lexer *lexer)
+{
+	return lexer->token_line;
+}
+
+const char *sieve_lexer_token_description(const struct sieve_lexer *lexer);
+
+void sieve_lexer_token_print(const struct sieve_lexer *lexer);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-limits.h b/pigeonhole/src/lib-sieve/sieve-limits.h
new file mode 100644
index 0000000..1adbaa6
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-limits.h
@@ -0,0 +1,45 @@
+#ifndef SIEVE_LIMITS_H
+#define SIEVE_LIMITS_H
+
+/*
+ * Scripts
+ */
+
+#define SIEVE_MAX_SCRIPT_NAME_LEN                       256
+
+#define SIEVE_DEFAULT_MAX_SCRIPT_SIZE                   (1 << 20)
+
+#define SIEVE_MAX_LOOP_DEPTH                            4
+
+/*
+ * Lexer
+ */
+
+#define SIEVE_MAX_STRING_LEN                            (1 << 20)
+#define SIEVE_MAX_IDENTIFIER_LEN                        32
+
+/*
+ * AST
+ */
+
+#define SIEVE_MAX_COMMAND_ARGUMENTS                     32
+#define SIEVE_MAX_BLOCK_NESTING                         32
+#define SIEVE_MAX_TEST_NESTING                          32
+
+/*
+ * Runtime
+ */
+
+#define SIEVE_MAX_MATCH_VALUES                          32
+#define SIEVE_HIGH_CPU_TIME_MSECS                       1500
+#define SIEVE_DEFAULT_MAX_CPU_TIME_SECS                 30
+#define SIEVE_DEFAULT_RESOURCE_USAGE_TIMEOUT_SECS       (60 * 60)
+
+/*
+ * Actions
+ */
+
+#define SIEVE_DEFAULT_MAX_ACTIONS                       32
+#define SIEVE_DEFAULT_MAX_REDIRECTS                     4
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-match-types.c b/pigeonhole/src/lib-sieve/sieve-match-types.c
new file mode 100644
index 0000000..a61737e
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-match-types.c
@@ -0,0 +1,569 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "compat.h"
+#include "mempool.h"
+#include "hash.h"
+#include "array.h"
+
+#include "sieve-common.h"
+#include "sieve-limits.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+#include "sieve-comparators.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "sieve-match-types.h"
+
+#include <string.h>
+
+/*
+ * Types
+ */
+
+struct sieve_match_values {
+	pool_t pool;
+	ARRAY(string_t *) values;
+	unsigned count;
+};
+
+/*
+ * Default match types
+ */
+
+const struct sieve_match_type_def *sieve_core_match_types[] = {
+	&is_match_type, &contains_match_type, &matches_match_type
+};
+
+const unsigned int sieve_core_match_types_count =
+	N_ELEMENTS(sieve_core_match_types);
+
+/*
+ * Match-type 'extension'
+ */
+
+static bool mtch_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+
+const struct sieve_extension_def match_type_extension = {
+	.name = "@match-types",
+	.validator_load = mtch_validator_load
+};
+
+/*
+ * Validator context:
+ *   name-based match-type registry.
+ */
+
+static struct sieve_validator_object_registry *_get_object_registry
+(struct sieve_validator *valdtr)
+{
+	struct sieve_instance *svinst;
+	const struct sieve_extension *mcht_ext;
+
+	svinst = sieve_validator_svinst(valdtr);
+	mcht_ext = sieve_get_match_type_extension(svinst);
+	return sieve_validator_object_registry_get(valdtr, mcht_ext);
+}
+
+void sieve_match_type_register
+(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+	const struct sieve_match_type_def *mcht_def)
+{
+	struct sieve_validator_object_registry *regs = _get_object_registry(valdtr);
+
+	sieve_validator_object_registry_add(regs, ext, &mcht_def->obj_def);
+}
+
+static bool sieve_match_type_exists
+(struct sieve_validator *valdtr, const char *identifier)
+{
+	struct sieve_validator_object_registry *regs = _get_object_registry(valdtr);
+
+	return sieve_validator_object_registry_find(regs, identifier, NULL);
+}
+
+static const struct sieve_match_type *sieve_match_type_create_instance
+(struct sieve_validator *valdtr, struct sieve_command *cmd,
+	const char *identifier)
+{
+	struct sieve_validator_object_registry *regs = _get_object_registry(valdtr);
+	struct sieve_object object;
+	struct sieve_match_type *mcht;
+
+	if ( !sieve_validator_object_registry_find(regs, identifier, &object) )
+		return NULL;
+
+	mcht = p_new(sieve_command_pool(cmd), struct sieve_match_type, 1);
+	mcht->object = object;
+	mcht->def = (const struct sieve_match_type_def *) object.def;
+
+  return mcht;
+}
+
+bool mtch_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	struct sieve_validator_object_registry *regs =
+		sieve_validator_object_registry_init(valdtr, ext);
+	unsigned int i;
+
+	/* Register core match-types */
+	for ( i = 0; i < sieve_core_match_types_count; i++ ) {
+		sieve_validator_object_registry_add
+			(regs, NULL, &(sieve_core_match_types[i]->obj_def));
+	}
+
+	return TRUE;
+}
+
+/*
+ * Interpreter context
+ */
+
+struct mtch_interpreter_context {
+	struct sieve_match_values *match_values;
+	bool match_values_enabled;
+};
+
+static void mtch_interpreter_free
+(const struct sieve_extension *ext ATTR_UNUSED,
+	struct sieve_interpreter *interp ATTR_UNUSED, void *context)
+{
+	struct mtch_interpreter_context *mctx =
+		(struct mtch_interpreter_context *) context;
+
+	if ( mctx->match_values != NULL ) {
+		pool_unref(&mctx->match_values->pool);
+	}
+}
+
+struct sieve_interpreter_extension
+mtch_interpreter_extension = {
+	.ext_def = &match_type_extension,
+	.free = mtch_interpreter_free
+};
+
+static inline struct mtch_interpreter_context *get_interpreter_context
+(struct sieve_interpreter *interp, bool create)
+{
+	struct sieve_instance *svinst;
+	const struct sieve_extension *mcht_ext;
+	struct mtch_interpreter_context *ctx;
+
+	svinst = sieve_interpreter_svinst(interp);
+	mcht_ext = sieve_get_match_type_extension(svinst);
+
+	ctx = (struct mtch_interpreter_context *)
+		sieve_interpreter_extension_get_context(interp, mcht_ext);
+
+	if ( ctx == NULL && create ) {
+		pool_t pool = sieve_interpreter_pool(interp);
+		ctx = p_new(pool, struct mtch_interpreter_context, 1);
+
+		sieve_interpreter_extension_register
+			(interp, mcht_ext, &mtch_interpreter_extension, (void *) ctx);
+	}
+
+	return ctx;
+}
+
+/*
+ * Match values
+ */
+
+bool sieve_match_values_set_enabled
+(const struct sieve_runtime_env *renv, bool enable)
+{
+	struct mtch_interpreter_context *ctx =
+		get_interpreter_context(renv->interp, enable);
+
+	if ( ctx != NULL ) {
+		bool previous = ctx->match_values_enabled;
+
+		ctx->match_values_enabled = enable;
+		return previous;
+	}
+
+	return FALSE;
+}
+
+bool sieve_match_values_are_enabled
+(const struct sieve_runtime_env *renv)
+{
+	struct mtch_interpreter_context *ctx =
+		get_interpreter_context(renv->interp, FALSE);
+
+	return ( ctx == NULL ? FALSE : ctx->match_values_enabled );
+}
+
+struct sieve_match_values *sieve_match_values_start
+(const struct sieve_runtime_env *renv)
+{
+	struct mtch_interpreter_context *ctx =
+		get_interpreter_context(renv->interp, FALSE);
+	struct sieve_match_values *match_values;
+
+	if ( ctx == NULL || !ctx->match_values_enabled )
+		return NULL;
+
+	pool_t pool = pool_alloconly_create("sieve_match_values", 1024);
+
+	match_values = p_new(pool, struct sieve_match_values, 1);
+	match_values->pool = pool;
+	match_values->count = 0;
+
+	p_array_init(&match_values->values, pool, 4);
+
+	return match_values;
+}
+
+static string_t *sieve_match_values_add_entry
+(struct sieve_match_values *mvalues)
+{
+	string_t *entry;
+
+	if ( mvalues == NULL ) return NULL;
+
+	if ( mvalues->count >= SIEVE_MAX_MATCH_VALUES ) return NULL;
+
+	if ( mvalues->count >= array_count(&mvalues->values) ) {
+		entry = str_new(mvalues->pool, 64);
+		array_append(&mvalues->values, &entry, 1);	} else {
+		string_t * const *ep = array_idx(&mvalues->values, mvalues->count);
+		entry = *ep;
+		str_truncate(entry, 0);
+	}
+
+	mvalues->count++;
+
+	return entry;
+}
+
+void sieve_match_values_set
+(struct sieve_match_values *mvalues, unsigned int index, string_t *value)
+{
+	if ( mvalues != NULL && index < array_count(&mvalues->values) ) {
+		string_t * const *ep = array_idx(&mvalues->values, index);
+    	string_t *entry = *ep;
+
+	    if ( entry != NULL && value != NULL ) {
+			str_truncate(entry, 0);
+        	str_append_str(entry, value);
+		}
+	}
+}
+
+void sieve_match_values_add
+(struct sieve_match_values *mvalues, string_t *value)
+{
+	string_t *entry = sieve_match_values_add_entry(mvalues);
+
+	if ( entry != NULL && value != NULL )
+		str_append_str(entry, value);
+}
+
+void sieve_match_values_add_char
+(struct sieve_match_values *mvalues, char c)
+{
+	string_t *entry = sieve_match_values_add_entry(mvalues);
+
+	if ( entry != NULL )
+		str_append_c(entry, c);
+}
+
+void sieve_match_values_skip
+(struct sieve_match_values *mvalues, int num)
+{
+	int i;
+
+	for ( i = 0; i < num; i++ )
+		(void) sieve_match_values_add_entry(mvalues);
+}
+
+void sieve_match_values_commit
+(const struct sieve_runtime_env *renv, struct sieve_match_values **mvalues)
+{
+	struct mtch_interpreter_context *ctx;
+
+	if ( (*mvalues) == NULL ) return;
+
+	ctx = get_interpreter_context(renv->interp, FALSE);
+	if ( ctx == NULL || !ctx->match_values_enabled )
+		return;
+
+	if ( ctx->match_values != NULL ) {
+		pool_unref(&ctx->match_values->pool);
+		ctx->match_values = NULL;
+	}
+
+	ctx->match_values = *mvalues;
+	*mvalues = NULL;
+}
+
+void sieve_match_values_abort
+(struct sieve_match_values **mvalues)
+{
+	if ( (*mvalues) == NULL ) return;
+
+	pool_unref(&(*mvalues)->pool);
+	*mvalues = NULL;
+}
+
+void sieve_match_values_get
+(const struct sieve_runtime_env *renv, unsigned int index, string_t **value_r)
+{
+	struct mtch_interpreter_context *ctx =
+		get_interpreter_context(renv->interp, FALSE);
+	struct sieve_match_values *mvalues;
+
+	if ( ctx == NULL || ctx->match_values == NULL ) {
+		*value_r = NULL;
+		return;
+	}
+
+	mvalues = ctx->match_values;
+	if ( index < array_count(&mvalues->values) && index < mvalues->count ) {
+		string_t * const *entry = array_idx(&mvalues->values, index);
+
+		*value_r = *entry;
+		return;
+	}
+
+	*value_r = NULL;
+}
+
+/*
+ * Match-type tagged argument
+ */
+
+/* Forward declarations */
+
+static bool tag_match_type_is_instance_of
+	(struct sieve_validator *valdtr, struct sieve_command *cmd,
+		const struct sieve_extension *ext, const char *identifier, void **data);
+static bool tag_match_type_validate
+	(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *cmd);
+static bool tag_match_type_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+		struct sieve_command *cmd);
+
+/* Argument object */
+
+const struct sieve_argument_def match_type_tag = {
+	.identifier = "MATCH-TYPE",
+	.is_instance_of = tag_match_type_is_instance_of,
+	.validate = tag_match_type_validate,
+	.generate = tag_match_type_generate
+};
+
+/* Argument implementation */
+
+static bool tag_match_type_is_instance_of
+(struct sieve_validator *valdtr, struct sieve_command *cmd,
+	const struct sieve_extension *ext ATTR_UNUSED, const char *identifier,
+	void **data)
+{
+	const struct sieve_match_type *mcht;
+
+	if ( data == NULL )
+		return sieve_match_type_exists(valdtr, identifier);
+
+	if ( (mcht=sieve_match_type_create_instance
+		(valdtr, cmd, identifier)) == NULL )
+		return FALSE;
+
+	*data = (void *) mcht;
+	return TRUE;
+}
+
+static bool tag_match_type_validate
+(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+	struct sieve_command *cmd ATTR_UNUSED)
+{
+	const struct sieve_match_type *mcht =
+		(const struct sieve_match_type *) (*arg)->argument->data;
+	struct sieve_match_type_context *mtctx;
+
+	mtctx = p_new(sieve_command_pool(cmd), struct sieve_match_type_context, 1);
+	mtctx->match_type = mcht;
+	mtctx->argument = *arg;
+	mtctx->comparator = NULL; /* Can be filled in later */
+
+	(*arg)->argument->data = mtctx;
+
+	/* Syntax:
+	 *   ":is" / ":contains" / ":matches" (subject to extension)
+	 */
+
+	/* Skip tag */
+	*arg = sieve_ast_argument_next(*arg);
+
+	/* Check whether this match type requires additional validation.
+	 * Additional validation can override the match type recorded in the context
+	 * for later code generation.
+	 */
+	if ( mcht->def != NULL && mcht->def->validate != NULL ) {
+		return mcht->def->validate(valdtr, arg, mtctx);
+	}
+
+	return TRUE;
+}
+
+static bool tag_match_type_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+	struct sieve_command *cmd ATTR_UNUSED)
+{
+	struct sieve_match_type_context *mtctx =
+		(struct sieve_match_type_context *) arg->argument->data;
+
+	(void) sieve_opr_match_type_emit(cgenv->sblock, mtctx->match_type);
+
+	return TRUE;
+}
+
+void sieve_match_types_link_tags
+(struct sieve_validator *valdtr,
+	struct sieve_command_registration *cmd_reg, int id_code)
+{
+	struct sieve_instance *svinst;
+	const struct sieve_extension *mcht_ext;
+
+	svinst = sieve_validator_svinst(valdtr);
+	mcht_ext = sieve_get_comparator_extension(svinst);
+
+	sieve_validator_register_tag
+		(valdtr, cmd_reg, mcht_ext, &match_type_tag, id_code);
+}
+
+/*
+ * Validation
+ */
+
+bool sieve_match_type_validate
+(struct sieve_validator *valdtr, struct sieve_command *cmd,
+	struct sieve_ast_argument *key_arg,
+	const struct sieve_match_type *mcht_default,
+	const struct sieve_comparator *cmp_default)
+{
+	struct sieve_ast_argument *arg = sieve_command_first_argument(cmd);
+	struct sieve_ast_argument *mt_arg = NULL;
+	struct sieve_match_type_context *mtctx;
+	const struct sieve_match_type *mcht = NULL;
+	const struct sieve_comparator *cmp = NULL;
+
+	/* Find match type and comparator among the arguments */
+	while ( arg != NULL && arg != cmd->first_positional ) {
+		if ( sieve_argument_is_comparator(arg) ) {
+			cmp = sieve_comparator_tag_get(arg);
+			if ( mt_arg != NULL ) break;
+		}
+
+		if ( sieve_argument_is_match_type(arg) ) {
+			mt_arg = arg;
+			if ( cmp != NULL ) break;
+		}
+		arg = sieve_ast_argument_next(arg);
+	}
+
+	/* Verify using the default comparator if none is specified explicitly */
+	if ( cmp == NULL ) {
+		cmp = sieve_comparator_copy(sieve_command_pool(cmd), cmp_default);
+	}
+
+	/* Verify the default match type if none is specified explicitly */
+	if ( mt_arg == NULL || mt_arg->argument == NULL ||
+		mt_arg->argument->data == NULL ) {		
+		mcht = sieve_match_type_copy(sieve_command_pool(cmd), mcht_default);
+		mtctx = t_new(struct sieve_match_type_context, 1);
+		mtctx->command = cmd;
+		mtctx->match_type = mcht;
+	} else {
+		mtctx = (struct sieve_match_type_context *) mt_arg->argument->data;
+		mcht = mtctx->match_type;
+	}
+	mtctx->comparator = cmp;
+
+	/* Check whether this match type requires additional validation.
+	 * Additional validation can override the match type recorded in the context
+	 * for later code generation.
+	 */
+	if ( mcht != NULL && mcht->def != NULL &&
+		mcht->def->validate_context != NULL ) {
+		return mcht->def->validate_context(valdtr, mt_arg, mtctx, key_arg);
+	}
+
+	return TRUE;
+}
+
+void sieve_match_type_arguments_remove
+(struct sieve_validator *valdtr ATTR_UNUSED, struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg = sieve_command_first_argument(cmd);
+
+	/* Remove any comparator and match type arguments */
+	while ( arg != NULL && arg != cmd->first_positional ) {
+		if ( sieve_argument_is_comparator(arg) ) {
+			arg = sieve_ast_arguments_detach(arg, 1);
+			continue;
+		}
+
+		if ( sieve_argument_is_match_type(arg) ) {
+			arg = sieve_ast_arguments_detach(arg, 1);
+			continue;
+		}
+
+		arg = sieve_ast_argument_next(arg);
+	}
+}
+
+
+/*
+ * Match-type operand
+ */
+
+const struct sieve_operand_class sieve_match_type_operand_class =
+	{ "match type" };
+
+static const struct sieve_extension_objects core_match_types =
+	SIEVE_EXT_DEFINE_MATCH_TYPES(sieve_core_match_types);
+
+const struct sieve_operand_def match_type_operand = {
+	.name = "match-type",
+	.code = SIEVE_OPERAND_MATCH_TYPE,
+	.class = &sieve_match_type_operand_class,
+	.interface = &core_match_types
+};
+
+/*
+ * Common validation implementation
+ */
+
+bool sieve_match_substring_validate_context
+(struct sieve_validator *valdtr, struct sieve_ast_argument *arg,
+	struct sieve_match_type_context *ctx,
+	struct sieve_ast_argument *key_arg ATTR_UNUSED)
+{
+	const struct sieve_comparator *cmp = ctx->comparator;
+
+	if ( cmp == NULL || cmp->def == NULL )
+		return TRUE;
+
+	if ( (cmp->def->flags & SIEVE_COMPARATOR_FLAG_SUBSTRING_MATCH) == 0 ) {
+		sieve_argument_validate_error(valdtr, arg,
+			"the specified %s comparator does not support "
+			"sub-string matching as required by the :%s match type",
+			cmp->object.def->identifier, ctx->match_type->object.def->identifier );
+
+		return FALSE;
+	}
+
+	return TRUE;
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-match-types.h b/pigeonhole/src/lib-sieve/sieve-match-types.h
new file mode 100644
index 0000000..0417e2c
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-match-types.h
@@ -0,0 +1,233 @@
+#ifndef SIEVE_MATCH_TYPES_H
+#define SIEVE_MATCH_TYPES_H
+
+#include "sieve-common.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-objects.h"
+
+/*
+ * Types
+ */
+
+struct sieve_match_type_context;
+
+/*
+ * Core match types
+ */
+
+enum sieve_match_type_code {
+	SIEVE_MATCH_TYPE_IS,
+	SIEVE_MATCH_TYPE_CONTAINS,
+	SIEVE_MATCH_TYPE_MATCHES,
+	SIEVE_MATCH_TYPE_CUSTOM
+};
+
+extern const struct sieve_match_type_def is_match_type;
+extern const struct sieve_match_type_def contains_match_type;
+extern const struct sieve_match_type_def matches_match_type;
+
+/*
+ * Match type definition
+ */
+
+struct sieve_match_type_def {
+	struct sieve_object_def obj_def;
+
+	bool (*validate)
+		(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+			struct sieve_match_type_context *ctx);
+	bool (*validate_context)
+		(struct sieve_validator *valdtr, struct sieve_ast_argument *arg,
+			struct sieve_match_type_context *ctx, struct sieve_ast_argument *key_arg);
+
+	/*
+	 * Matching
+ 	 */
+
+	/* Custom implementation */
+
+	int (*match)
+		(struct sieve_match_context *mctx, struct sieve_stringlist *value_list,
+			struct sieve_stringlist *key_list);
+
+	/* Default match loop */
+
+	void (*match_init)(struct sieve_match_context *mctx);
+
+	int (*match_keys)
+		(struct sieve_match_context *mctx, const char *val, size_t val_size,
+			struct sieve_stringlist *key_list);
+	int (*match_key)
+		(struct sieve_match_context *mctx, const char *val, size_t val_size,
+			const char *key, size_t key_size);
+
+	void (*match_deinit)(struct sieve_match_context *mctx);
+};
+
+/*
+ * Match type instance
+ */
+
+struct sieve_match_type {
+	struct sieve_object object;
+
+	const struct sieve_match_type_def *def;
+};
+
+#define SIEVE_MATCH_TYPE_DEFAULT(definition) \
+	{ SIEVE_OBJECT_DEFAULT(definition), &(definition) }
+
+#define sieve_match_type_name(mcht) \
+	( (mcht)->object.def->identifier )
+#define sieve_match_type_is(mcht, definition) \
+	( (mcht)->def == &(definition) )
+
+static inline const struct sieve_match_type *sieve_match_type_copy
+(pool_t pool, const struct sieve_match_type *cmp_orig)
+{
+	struct sieve_match_type *cmp = p_new(pool, struct sieve_match_type, 1);
+
+	*cmp = *cmp_orig;
+
+	return cmp;
+}
+
+/*
+ * Match type context
+ */
+
+struct sieve_match_type_context {
+	struct sieve_command *command;
+	struct sieve_ast_argument *argument;
+
+	const struct sieve_match_type *match_type;
+
+	/* Only filled in when match_type->validate_context() is called */
+	const struct sieve_comparator *comparator;
+
+	/* Context data could be used in the future to pass data between validator and
+	 * generator in match types that use extra parameters. Currently not
+	 * necessary, not even for the relational extension.
+	 */
+	void *ctx_data;
+};
+
+/*
+ * Match type registration
+ */
+
+void sieve_match_type_register
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		const struct sieve_match_type_def *mcht);
+
+/*
+ * Match values
+ */
+
+struct sieve_match_values;
+
+bool sieve_match_values_set_enabled
+	(const struct sieve_runtime_env *renv, bool enable);
+bool sieve_match_values_are_enabled
+	(const struct sieve_runtime_env *renv);
+
+struct sieve_match_values *sieve_match_values_start
+	(const struct sieve_runtime_env *renv);
+void sieve_match_values_set
+	(struct sieve_match_values *mvalues, unsigned int index, string_t *value);
+void sieve_match_values_add
+	(struct sieve_match_values *mvalues, string_t *value);
+void sieve_match_values_add_char
+	(struct sieve_match_values *mvalues, char c);
+void sieve_match_values_skip
+	(struct sieve_match_values *mvalues, int num);
+
+void sieve_match_values_commit
+	(const struct sieve_runtime_env *renv, struct sieve_match_values **mvalues);
+void sieve_match_values_abort
+	(struct sieve_match_values **mvalues);
+
+void sieve_match_values_get
+	(const struct sieve_runtime_env *renv, unsigned int index, string_t **value_r);
+
+/*
+ * Match type tagged argument
+ */
+
+extern const struct sieve_argument_def match_type_tag;
+
+static inline bool sieve_argument_is_match_type
+	(struct sieve_ast_argument *arg)
+{
+	return ( arg->argument->def == &match_type_tag );
+}
+
+void sieve_match_types_link_tags
+	(struct sieve_validator *valdtr,
+		struct sieve_command_registration *cmd_reg, int id_code);
+
+/*
+ * Validation
+ */
+
+bool sieve_match_type_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd,
+		struct sieve_ast_argument *key_arg,
+		const struct sieve_match_type *mcht_default,
+		const struct sieve_comparator *cmp_default);
+
+void sieve_match_type_arguments_remove
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+
+/*
+ * Match type operand
+ */
+
+extern const struct sieve_operand_def match_type_operand;
+extern const struct sieve_operand_class sieve_match_type_operand_class;
+
+#define SIEVE_EXT_DEFINE_MATCH_TYPE(OP) SIEVE_EXT_DEFINE_OBJECT(OP)
+#define SIEVE_EXT_DEFINE_MATCH_TYPES(OPS) SIEVE_EXT_DEFINE_OBJECTS(OPS)
+
+static inline bool sieve_operand_is_match_type
+(const struct sieve_operand *operand)
+{
+	return ( operand != NULL && operand->def != NULL &&
+		operand->def->class == &sieve_match_type_operand_class );
+}
+
+static inline void sieve_opr_match_type_emit
+(struct sieve_binary_block *sblock, const struct sieve_match_type *mcht)
+{
+	sieve_opr_object_emit(sblock, mcht->object.ext, mcht->object.def);
+}
+
+static inline bool sieve_opr_match_type_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	return sieve_opr_object_dump
+		(denv, &sieve_match_type_operand_class, address, NULL);
+}
+
+static inline int sieve_opr_match_type_read
+(const struct sieve_runtime_env *renv, sieve_size_t *address,
+	struct sieve_match_type *mcht)
+{
+	if ( !sieve_opr_object_read
+		(renv, &sieve_match_type_operand_class, address, &mcht->object) )
+		return SIEVE_EXEC_BIN_CORRUPT;
+
+	mcht->def = (const struct sieve_match_type_def *) mcht->object.def;
+	return SIEVE_EXEC_OK;
+}
+
+/* Common validation implementation */
+
+bool sieve_match_substring_validate_context
+	(struct sieve_validator *valdtr, struct sieve_ast_argument *arg,
+		struct sieve_match_type_context *ctx,
+		struct sieve_ast_argument *key_arg);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-match.c b/pigeonhole/src/lib-sieve/sieve-match.c
new file mode 100644
index 0000000..37d37fe
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-match.c
@@ -0,0 +1,293 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "mempool.h"
+#include "hash.h"
+#include "array.h"
+#include "str-sanitize.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-runtime-trace.h"
+
+#include "sieve-match.h"
+
+/*
+ * Matching implementation
+ */
+
+struct sieve_match_context *sieve_match_begin
+(const struct sieve_runtime_env *renv,
+	const struct sieve_match_type *mcht,
+	const struct sieve_comparator *cmp)
+{
+	struct sieve_match_context *mctx;
+	pool_t pool;
+
+	/* Reject unimplemented match-type */
+	if ( mcht->def == NULL || (mcht->def->match == NULL &&
+			mcht->def->match_keys == NULL && mcht->def->match_key == NULL) )
+			return NULL;
+
+	/* Create match context */
+	pool = pool_alloconly_create("sieve_match_context", 1024);
+	mctx = p_new(pool, struct sieve_match_context, 1);
+	mctx->pool = pool;
+	mctx->runenv = renv;
+	mctx->match_type = mcht;
+	mctx->comparator = cmp;
+	mctx->exec_status = SIEVE_EXEC_OK;
+	mctx->trace = sieve_runtime_trace_active(renv, SIEVE_TRLVL_MATCHING);
+
+	/* Trace */
+	if ( mctx->trace ) {
+		sieve_runtime_trace_descend(renv);
+		sieve_runtime_trace(renv, 0,
+			"starting `:%s' match with `%s' comparator:",
+			sieve_match_type_name(mcht), sieve_comparator_name(cmp));
+	}
+
+	/* Initialize match type */
+	if ( mcht->def != NULL && mcht->def->match_init != NULL ) {
+		mcht->def->match_init(mctx);
+	}
+
+	return mctx;
+}
+
+int sieve_match_value
+(struct sieve_match_context *mctx, const char *value, size_t value_size,
+	struct sieve_stringlist *key_list)
+{
+	const struct sieve_match_type *mcht = mctx->match_type;
+	const struct sieve_runtime_env *renv = mctx->runenv;
+	int match, ret;
+
+	if ( mctx->trace ) {
+		sieve_runtime_trace(renv, 0,
+			"matching value `%s'", str_sanitize(value, 80));
+	}
+
+	/* Match to key values */
+
+	sieve_stringlist_reset(key_list);
+
+	if ( mctx->trace )
+		sieve_stringlist_set_trace(key_list, TRUE);
+
+	sieve_runtime_trace_descend(renv);
+
+	if ( mcht->def->match_keys != NULL ) {
+		/* Call match-type's own key match handler */
+		match = mcht->def->match_keys(mctx, value, value_size, key_list);
+	} else {
+		string_t *key_item = NULL;
+
+		/* Default key match loop */
+		match = 0;
+		while ( match == 0 &&
+			(ret=sieve_stringlist_next_item(key_list, &key_item)) > 0 ) {
+			T_BEGIN {
+				match = mcht->def->match_key
+					(mctx, value, value_size, str_c(key_item), str_len(key_item));
+
+				if ( mctx->trace ) {
+					sieve_runtime_trace(renv, 0,
+						"with key `%s' => %d", str_sanitize(str_c(key_item), 80),
+						match);
+				}
+			} T_END;
+		}
+
+		if ( ret < 0 ) {
+			mctx->exec_status = key_list->exec_status;
+			match = -1;
+		}
+	}
+
+	sieve_runtime_trace_ascend(renv);
+
+	if ( mctx->match_status < 0 || match < 0 )
+		mctx->match_status = -1;
+	else
+		mctx->match_status =
+			( mctx->match_status > match ? mctx->match_status : match );
+	return match;
+}
+
+int sieve_match_end(struct sieve_match_context **mctx, int *exec_status)
+{
+	const struct sieve_match_type *mcht = (*mctx)->match_type;
+	const struct sieve_runtime_env *renv = (*mctx)->runenv;
+	int match = (*mctx)->match_status;
+
+	if ( mcht->def != NULL && mcht->def->match_deinit != NULL )
+		mcht->def->match_deinit(*mctx);
+
+	if ( exec_status != NULL )
+		*exec_status = (*mctx)->exec_status;
+
+	pool_unref(&(*mctx)->pool);
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_MATCHING,
+		"finishing match with result: %s",
+		( match > 0 ? "matched" : ( match < 0 ? "error" : "not matched" ) ));
+	sieve_runtime_trace_ascend(renv);
+
+	return match;
+}
+
+int sieve_match
+(const struct sieve_runtime_env *renv,
+	const struct sieve_match_type *mcht,
+	const struct sieve_comparator *cmp,
+	struct sieve_stringlist *value_list,
+	struct sieve_stringlist *key_list,
+	int *exec_status)
+{
+	struct sieve_match_context *mctx;
+	string_t *value_item = NULL;
+	int match, ret;
+
+	if ( (mctx=sieve_match_begin(renv, mcht, cmp)) == NULL )
+		return 0;
+
+	/* Match value to keys */
+
+	sieve_stringlist_reset(value_list);
+
+	if ( mctx->trace )
+		sieve_stringlist_set_trace(value_list, TRUE);
+
+	if ( mcht->def->match != NULL ) {
+		/* Call match-type's match handler */
+		match = mctx->match_status =
+			mcht->def->match(mctx, value_list, key_list);
+
+	} else {
+		/* Default value match loop */
+
+		match = 0;
+		while ( match == 0 &&
+			(ret=sieve_stringlist_next_item(value_list, &value_item)) > 0 ) {
+
+			match = sieve_match_value
+				(mctx, str_c(value_item), str_len(value_item), key_list);
+		}
+
+		if ( ret < 0 ) {
+			mctx->exec_status = value_list->exec_status;
+			match = -1;
+		}
+	}
+
+	(void)sieve_match_end(&mctx, exec_status);
+	return match;
+}
+
+/*
+ * Reading match operands
+ */
+
+int sieve_match_opr_optional_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address, int *opt_code)
+{
+	int _opt_code = 0;
+	bool final = FALSE, opok = TRUE;
+
+	if ( opt_code == NULL ) {
+		opt_code = &_opt_code;
+		final = TRUE;
+	}
+
+	while ( opok ) {
+		int opt;
+
+		if ( (opt=sieve_opr_optional_dump(denv, address, opt_code)) <= 0 )
+			return opt;
+
+		switch ( *opt_code ) {
+		case SIEVE_MATCH_OPT_COMPARATOR:
+			opok = sieve_opr_comparator_dump(denv, address);
+			break;
+		case SIEVE_MATCH_OPT_MATCH_TYPE:
+			opok = sieve_opr_match_type_dump(denv, address);
+			break;
+		default:
+			return ( final ? -1 : 1 );
+		}
+	}
+
+	return -1;
+}
+
+int sieve_match_opr_optional_read
+(const struct sieve_runtime_env *renv, sieve_size_t *address, int *opt_code,
+	int *exec_status, struct sieve_comparator *cmp, struct sieve_match_type *mcht)
+{
+	int _opt_code = 0;
+	bool final = FALSE;
+	int status = SIEVE_EXEC_OK;
+
+	if ( opt_code == NULL ) {
+		opt_code = &_opt_code;
+		final = TRUE;
+	}
+
+	if ( exec_status != NULL )
+		*exec_status = SIEVE_EXEC_OK;
+
+	while ( status == SIEVE_EXEC_OK ) {
+		int opt;
+
+		if ( (opt=sieve_opr_optional_read(renv, address, opt_code)) <= 0 ){
+			if ( opt < 0 && exec_status != NULL )
+				*exec_status = SIEVE_EXEC_BIN_CORRUPT;
+			return opt;
+		}
+
+		switch ( *opt_code ) {
+		case SIEVE_MATCH_OPT_COMPARATOR:
+			if (cmp == NULL) {
+				sieve_runtime_trace_error(renv, "unexpected comparator operand");
+				if ( exec_status != NULL )
+					*exec_status = SIEVE_EXEC_BIN_CORRUPT;
+				return -1;
+			}
+			status = sieve_opr_comparator_read(renv, address, cmp);
+			break;
+		case SIEVE_MATCH_OPT_MATCH_TYPE:
+			if (mcht == NULL) {
+				sieve_runtime_trace_error(renv, "unexpected match-type operand");
+				if ( exec_status != NULL )
+					*exec_status = SIEVE_EXEC_BIN_CORRUPT;
+				return -1;
+			}
+			status = sieve_opr_match_type_read(renv, address, mcht);
+			break;
+		default:
+			if ( final ) {
+				sieve_runtime_trace_error(renv, "invalid optional operand");
+				if ( exec_status != NULL )
+					*exec_status = SIEVE_EXEC_BIN_CORRUPT;
+				return -1;
+			}
+			return 1;
+		}
+	}
+
+	if ( exec_status != NULL )
+		*exec_status = status;
+	return -1;
+}
+
diff --git a/pigeonhole/src/lib-sieve/sieve-match.h b/pigeonhole/src/lib-sieve/sieve-match.h
new file mode 100644
index 0000000..d4d726f
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-match.h
@@ -0,0 +1,68 @@
+#ifndef SIEVE_MATCH_H
+#define SIEVE_MATCH_H
+
+#include "sieve-common.h"
+
+/*
+ * Matching context
+ */
+
+struct sieve_match_context {
+	pool_t pool;
+
+	const struct sieve_runtime_env *runenv;
+
+	const struct sieve_match_type *match_type;
+	const struct sieve_comparator *comparator;
+
+	void *data;
+
+	int match_status;
+	int exec_status;
+
+	bool trace:1;
+};
+
+/*
+ * Matching implementation
+ */
+
+/* Manual value iteration (for when multiple matches are allowed) */
+struct sieve_match_context *sieve_match_begin
+	(const struct sieve_runtime_env *renv,
+		const struct sieve_match_type *mcht,
+		const struct sieve_comparator *cmp);
+int sieve_match_value
+	(struct sieve_match_context *mctx, const char *value, size_t value_size,
+		struct sieve_stringlist *key_list);
+int sieve_match_end(struct sieve_match_context **mctx, int *exec_status);
+
+/* Default matching operation */
+int sieve_match
+	(const struct sieve_runtime_env *renv,
+		const struct sieve_match_type *mcht,
+		const struct sieve_comparator *cmp,
+		struct sieve_stringlist *value_list,
+		struct sieve_stringlist *key_list,
+		int *exec_status);
+
+/*
+ * Read matching operands
+ */
+
+enum sieve_match_opt_operand {
+	SIEVE_MATCH_OPT_END,
+	SIEVE_MATCH_OPT_COMPARATOR,
+	SIEVE_MATCH_OPT_MATCH_TYPE,
+	SIEVE_MATCH_OPT_LAST
+};
+
+int sieve_match_opr_optional_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address, int *opt_code);
+
+int sieve_match_opr_optional_read
+	(const struct sieve_runtime_env *renv, sieve_size_t *address, int *opt_code,
+		int *exec_status, struct sieve_comparator *cmp,
+		struct sieve_match_type *mcht);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-message.c b/pigeonhole/src/lib-sieve/sieve-message.c
new file mode 100644
index 0000000..d086883
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-message.c
@@ -0,0 +1,1845 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "mempool.h"
+#include "array.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "istream.h"
+#include "time-util.h"
+#include "rfc822-parser.h"
+#include "message-date.h"
+#include "message-parser.h"
+#include "message-decoder.h"
+#include "message-header-decode.h"
+#include "mail-html2text.h"
+#include "mail-storage.h"
+#include "mail-user.h"
+#include "smtp-params.h"
+#include "master-service.h"
+#include "master-service-settings.h"
+#include "raw-storage.h"
+
+#include "edit-mail.h"
+
+#include "sieve-common.h"
+#include "sieve-stringlist.h"
+#include "sieve-error.h"
+#include "sieve-extensions.h"
+#include "sieve-code.h"
+#include "sieve-address.h"
+#include "sieve-address-parts.h"
+#include "sieve-runtime.h"
+#include "sieve-runtime-trace.h"
+#include "sieve-match.h"
+#include "sieve-interpreter.h"
+
+#include "sieve-message.h"
+
+/*
+ * Message transmission
+ */
+
+const char *sieve_message_get_new_id(const struct sieve_instance *svinst)
+{
+	static int count = 0;
+
+	return t_strdup_printf("<dovecot-sieve-%s-%s-%d@%s>",
+		dec2str(ioloop_timeval.tv_sec), dec2str(ioloop_timeval.tv_usec),
+    count++, svinst->hostname);
+}
+
+/*
+ * Message context
+ */
+
+struct sieve_message_header {
+	const char *name;
+
+	const unsigned char *value, *utf8_value;
+	size_t value_len, utf8_value_len;
+};
+
+struct sieve_message_part {
+	struct sieve_message_part *parent, *next, *children;
+
+	ARRAY(struct sieve_message_header) headers;
+
+	const char *content_type;
+	const char *content_disposition;
+
+	const char *decoded_body;
+	const char *text_body;
+	size_t decoded_body_size;
+	size_t text_body_size;
+
+	bool have_body:1; /* there's the empty end-of-headers line */
+	bool epilogue:1;  /* this is a multipart epilogue */
+};
+
+struct sieve_message_version {
+	struct mail *mail;
+	struct mailbox *box;
+	struct mailbox_transaction_context *trans;
+	struct edit_mail *edit_mail;
+};
+
+struct sieve_message_context {
+	pool_t pool;
+	pool_t context_pool;
+	int refcount;
+
+	struct sieve_instance *svinst;
+	struct timeval time;
+
+	struct mail_user *mail_user;
+	const struct sieve_message_data *msgdata;
+
+	/* Message versioning */
+
+	struct mail_user *raw_mail_user;
+	ARRAY(struct sieve_message_version) versions;
+
+	/* Context data for extensions */
+
+	ARRAY(void *) ext_contexts;
+
+	/* Body */
+
+	ARRAY(struct sieve_message_part *) cached_body_parts;
+	ARRAY(struct sieve_message_part_data) return_body_parts;
+	buffer_t *raw_body;
+
+	bool edit_snapshot:1;
+	bool substitute_snapshot:1;
+};
+
+/*
+ * Message versions
+ */
+
+static inline struct sieve_message_version *sieve_message_version_new
+(struct sieve_message_context *msgctx)
+{
+	return array_append_space(&msgctx->versions);
+}
+
+static inline struct sieve_message_version *sieve_message_version_get
+(struct sieve_message_context *msgctx)
+{
+	struct sieve_message_version *versions;
+	unsigned int count;
+
+	versions = array_get_modifiable(&msgctx->versions, &count);
+	if ( count == 0 )
+		return array_append_space(&msgctx->versions);
+
+	return &versions[count-1];
+}
+
+static inline void sieve_message_version_free
+(struct sieve_message_version *version)
+{
+	if ( version->edit_mail != NULL ) {
+		edit_mail_unwrap(&version->edit_mail);
+		version->edit_mail = NULL;
+	}
+
+	if ( version->mail != NULL ) {
+		mail_free(&version->mail);
+		mailbox_transaction_rollback(&version->trans);
+		mailbox_free(&version->box);
+		version->mail = NULL;
+	}
+}
+
+/*
+ * Message context object
+ */
+
+struct sieve_message_context *sieve_message_context_create
+(struct sieve_instance *svinst, struct mail_user *mail_user,
+	const struct sieve_message_data *msgdata)
+{
+	struct sieve_message_context *msgctx;
+
+	msgctx = i_new(struct sieve_message_context, 1);
+	msgctx->refcount = 1;
+	msgctx->svinst = svinst;
+
+	msgctx->mail_user = mail_user;
+	msgctx->msgdata = msgdata;
+
+	i_gettimeofday(&msgctx->time);
+
+	sieve_message_context_reset(msgctx);
+
+	return msgctx;
+}
+
+void sieve_message_context_ref(struct sieve_message_context *msgctx)
+{
+	msgctx->refcount++;
+}
+
+static void sieve_message_context_clear(struct sieve_message_context *msgctx)
+{
+	struct sieve_message_version *versions;
+	unsigned int count, i;
+
+	if ( msgctx->pool != NULL ) {
+		versions = array_get_modifiable(&msgctx->versions, &count);
+
+		for ( i = 0; i < count; i++ ) {
+			sieve_message_version_free(&versions[i]);
+		}
+
+		pool_unref(&(msgctx->pool));
+	}
+}
+
+void sieve_message_context_unref(struct sieve_message_context **msgctx)
+{
+	i_assert((*msgctx)->refcount > 0);
+
+	if (--(*msgctx)->refcount != 0)
+		return;
+
+	if ( (*msgctx)->raw_mail_user != NULL )
+		mail_user_unref(&(*msgctx)->raw_mail_user);
+
+	sieve_message_context_clear(*msgctx);
+
+	if ( (*msgctx)->context_pool != NULL )
+		pool_unref(&((*msgctx)->context_pool));
+
+	i_free(*msgctx);
+	*msgctx = NULL;
+}
+
+static void sieve_message_context_flush(struct sieve_message_context *msgctx)
+{
+	pool_t pool;
+
+	if ( msgctx->context_pool != NULL )
+		pool_unref(&(msgctx->context_pool));
+
+	msgctx->context_pool = pool =
+		pool_alloconly_create("sieve_message_context_data", 2048);
+
+	p_array_init(&msgctx->ext_contexts, pool,
+		sieve_extensions_get_count(msgctx->svinst));
+
+	p_array_init(&msgctx->cached_body_parts, pool, 8);
+	p_array_init(&msgctx->return_body_parts, pool, 8);
+	msgctx->raw_body = NULL;
+}
+
+void sieve_message_context_reset(struct sieve_message_context *msgctx)
+{
+	sieve_message_context_clear(msgctx);
+
+	msgctx->pool = pool_alloconly_create("sieve_message_context", 1024);
+
+	p_array_init(&msgctx->versions, msgctx->pool, 4);
+
+	sieve_message_context_flush(msgctx);
+}
+
+pool_t sieve_message_context_pool(struct sieve_message_context *msgctx)
+{
+	return msgctx->context_pool;
+}
+
+void sieve_message_context_time(struct sieve_message_context *msgctx,
+   struct timeval *time)
+{
+   *time = msgctx->time;
+}
+
+/* Extension support */
+
+void sieve_message_context_extension_set
+(struct sieve_message_context *msgctx, const struct sieve_extension *ext,
+	void *context)
+{
+	if ( ext->id < 0 ) return;
+
+	array_idx_set(&msgctx->ext_contexts, (unsigned int) ext->id, &context);
+}
+
+const void *sieve_message_context_extension_get
+(struct sieve_message_context *msgctx, const struct sieve_extension *ext)
+{
+	void * const *ctx;
+
+	if  ( ext->id < 0 || ext->id >= (int) array_count(&msgctx->ext_contexts) )
+		return NULL;
+
+	ctx = array_idx(&msgctx->ext_contexts, (unsigned int) ext->id);
+
+	return *ctx;
+}
+
+/* Envelope */
+
+const struct smtp_address *sieve_message_get_orig_recipient
+(struct sieve_message_context *msgctx)
+{
+	const struct sieve_message_data *msgdata = msgctx->msgdata;
+	const struct smtp_address *orcpt_to = NULL;
+
+	if ( msgdata->envelope.rcpt_params != NULL ) {
+		orcpt_to = msgdata->envelope.rcpt_params->orcpt.addr;
+		if ( !smtp_address_isnull(orcpt_to) )
+			return orcpt_to;
+	}
+
+	orcpt_to = msgdata->envelope.rcpt_to;
+	return ( !smtp_address_isnull(orcpt_to) ? orcpt_to : NULL );
+}
+
+const struct smtp_address *sieve_message_get_final_recipient
+(struct sieve_message_context *msgctx)
+{
+	const struct sieve_message_data *msgdata = msgctx->msgdata;
+	const struct smtp_address *rcpt_to = msgdata->envelope.rcpt_to;
+
+	return ( !smtp_address_isnull(rcpt_to) ? rcpt_to : NULL);
+}
+
+const struct smtp_address *sieve_message_get_sender
+(struct sieve_message_context *msgctx)
+{
+	const struct sieve_message_data *msgdata = msgctx->msgdata;
+	const struct smtp_address *mail_from = msgdata->envelope.mail_from;
+
+	return ( !smtp_address_isnull(mail_from) ? mail_from : NULL);
+}
+
+/*
+ * Mail
+ */
+
+int sieve_message_substitute
+(struct sieve_message_context *msgctx, struct istream *input)
+{
+	static const char *wanted_headers[] = {
+		"From", "Message-ID", "Subject", "Return-Path", NULL
+	};
+	static const struct smtp_address default_sender = {
+		.localpart = DEFAULT_ENVELOPE_SENDER,
+		.domain = NULL,
+	};
+	struct mail_user *mail_user = msgctx->mail_user;
+	struct sieve_message_version *version;
+	struct mailbox_header_lookup_ctx *headers_ctx;
+	struct mailbox *box = NULL;
+	const struct smtp_address *sender;
+	int ret;
+
+	i_assert(input->blocking);
+
+	if ( msgctx->raw_mail_user == NULL ) {
+		void **sets = master_service_settings_get_others(master_service);
+
+		msgctx->raw_mail_user =
+			raw_storage_create_from_set(mail_user->set_info, sets[0]);
+	}
+
+	i_stream_seek(input, 0);
+	sender = sieve_message_get_sender(msgctx);
+	sender = (sender == NULL ? &default_sender : sender);
+	ret = raw_mailbox_alloc_stream(msgctx->raw_mail_user, input, (time_t)-1,
+		smtp_address_encode(sender), &box);
+
+	if ( ret < 0 ) {
+		e_error(msgctx->svinst->event,
+			"can't open substituted mail as raw: %s",
+			mailbox_get_last_internal_error(box, NULL));
+		return -1;
+	}
+
+	if ( msgctx->substitute_snapshot ) {
+		version = sieve_message_version_new(msgctx);
+	} else {
+		version = sieve_message_version_get(msgctx);
+		sieve_message_version_free(version);
+	}
+
+	version->box = box;
+	version->trans = mailbox_transaction_begin(box, 0, __func__);
+	headers_ctx = mailbox_header_lookup_init(box, wanted_headers);
+	version->mail = mail_alloc(version->trans, 0, headers_ctx);
+	mailbox_header_lookup_unref(&headers_ctx);
+	mail_set_seq(version->mail, 1);
+
+	sieve_message_context_flush(msgctx);
+
+	msgctx->substitute_snapshot = FALSE;
+	msgctx->edit_snapshot = FALSE;
+
+	return 1;
+}
+
+struct mail *sieve_message_get_mail
+(struct sieve_message_context *msgctx)
+{
+	const struct sieve_message_version *versions;
+	unsigned int count;
+
+	versions = array_get(&msgctx->versions, &count);
+	if ( count == 0 )
+		return msgctx->msgdata->mail;
+
+	if ( versions[count-1].edit_mail != NULL )
+		return edit_mail_get_mail(versions[count-1].edit_mail);
+
+	return versions[count-1].mail;
+}
+
+struct edit_mail *sieve_message_edit
+(struct sieve_message_context *msgctx)
+{
+	struct sieve_message_version *version;
+
+	version = sieve_message_version_get(msgctx);
+
+	if ( version->edit_mail == NULL ) {
+		version->edit_mail = edit_mail_wrap
+			(( version->mail == NULL ? msgctx->msgdata->mail : version->mail ));
+	} else if ( msgctx->edit_snapshot ) {
+		version->edit_mail = edit_mail_snapshot(version->edit_mail);
+	}
+
+	msgctx->edit_snapshot = FALSE;
+
+	return version->edit_mail;
+}
+
+void sieve_message_snapshot
+(struct sieve_message_context *msgctx)
+{
+	msgctx->edit_snapshot = TRUE;
+	msgctx->substitute_snapshot = TRUE;
+}
+
+/*
+ * Message header list
+ */
+
+/* Forward declarations */
+
+static int sieve_message_header_list_next_item
+	(struct sieve_header_list *_hdrlist, const char **name_r,
+		string_t **value_r);
+static int sieve_message_header_list_next_value
+	(struct sieve_stringlist *_strlist, string_t **value_r);
+static void sieve_message_header_list_reset
+	(struct sieve_stringlist *_strlist);
+
+/* String list object */
+
+struct sieve_message_header_list {
+	struct sieve_header_list hdrlist;
+
+	struct sieve_stringlist *field_names;
+
+	const char *header_name;
+	const char *const *headers;
+	int headers_index;
+
+	bool mime_decode:1;
+};
+
+struct sieve_header_list *sieve_message_header_list_create
+(const struct sieve_runtime_env *renv,
+	struct sieve_stringlist *field_names,
+	bool mime_decode)
+{
+	struct sieve_message_header_list *hdrlist;
+
+	hdrlist = t_new(struct sieve_message_header_list, 1);
+	hdrlist->hdrlist.strlist.runenv = renv;
+	hdrlist->hdrlist.strlist.exec_status = SIEVE_EXEC_OK;
+	hdrlist->hdrlist.strlist.next_item = sieve_message_header_list_next_value;
+	hdrlist->hdrlist.strlist.reset = sieve_message_header_list_reset;
+	hdrlist->hdrlist.next_item = sieve_message_header_list_next_item;
+	hdrlist->field_names = field_names;
+	hdrlist->mime_decode = mime_decode;
+
+	return &hdrlist->hdrlist;
+}
+
+// NOTE: get rid of this once we have a proper Sieve string type
+static inline string_t *_header_right_trim(const char *raw)
+{
+	string_t *result;
+	const char *p, *pend;
+
+	pend = raw + strlen(raw);
+	if (raw == pend) {
+		result = t_str_new(1);
+	} else {
+		for ( p = pend-1; p >= raw; p-- ) {
+			if ( *p != ' ' && *p != '\t' ) break;
+		}
+		result = t_str_new(p - raw + 1);
+		str_append_data(result, raw, p - raw + 1);
+	}
+	return result;
+}
+
+/* String list implementation */
+
+static int sieve_message_header_list_next_item
+(struct sieve_header_list *_hdrlist, const char **name_r,
+	string_t **value_r)
+{
+	struct sieve_message_header_list *hdrlist =
+		(struct sieve_message_header_list *) _hdrlist;
+	const struct sieve_runtime_env *renv = _hdrlist->strlist.runenv;
+	struct mail *mail = sieve_message_get_mail(renv->msgctx);
+
+	if ( name_r != NULL )
+		*name_r = NULL;
+	*value_r = NULL;
+
+	/* Check for end of current header list */
+	if ( hdrlist->headers == NULL ) {
+		hdrlist->headers_index = 0;
+ 	} else if ( hdrlist->headers[hdrlist->headers_index] == NULL ) {
+		hdrlist->headers = NULL;
+		hdrlist->headers_index = 0;
+	}
+
+	/* Fetch next header */
+	while ( hdrlist->headers == NULL ) {
+		string_t *hdr_item = NULL;
+		int ret;
+
+		/* Read next header name from source list */
+		if ( (ret=sieve_stringlist_next_item
+			(hdrlist->field_names, &hdr_item)) <= 0 )
+			return ret;
+
+		hdrlist->header_name = str_c(hdr_item);
+
+		if ( _hdrlist->strlist.trace ) {
+			sieve_runtime_trace(renv, 0,
+				"extracting `%s' headers from message",
+				str_sanitize(str_c(hdr_item), 80));
+		}
+
+		/* Fetch all matching headers from the e-mail */
+		if ( hdrlist->mime_decode ) {
+			ret = mail_get_headers_utf8(mail,
+				str_c(hdr_item), &hdrlist->headers);
+		} else {
+			ret = mail_get_headers(mail,
+				str_c(hdr_item), &hdrlist->headers);
+		}
+
+		if (ret < 0) {
+			_hdrlist->strlist.exec_status =
+				sieve_runtime_mail_error(renv, mail,
+					"failed to read header field `%s'", str_c(hdr_item));
+			return -1;
+		}
+
+		if ( ret == 0 || hdrlist->headers[0] == NULL ) {
+			/* Try next item when no headers found */
+			hdrlist->headers = NULL;
+		}
+	}
+
+	/* Return next item */
+	if ( name_r != NULL )
+		*name_r = hdrlist->header_name;
+	*value_r = _header_right_trim(hdrlist->headers[hdrlist->headers_index++]);
+	return 1;
+}
+
+static int sieve_message_header_list_next_value
+(struct sieve_stringlist *_strlist, string_t **value_r)
+{
+	struct sieve_header_list *hdrlist =
+		(struct sieve_header_list *) _strlist;
+
+	return sieve_message_header_list_next_item
+		(hdrlist, NULL, value_r);
+}
+
+static void sieve_message_header_list_reset
+(struct sieve_stringlist *strlist)
+{
+	struct sieve_message_header_list *hdrlist =
+		(struct sieve_message_header_list *) strlist;
+
+	hdrlist->headers = NULL;
+	hdrlist->headers_index = 0;
+	sieve_stringlist_reset(hdrlist->field_names);
+}
+
+/*
+ * Header override operand
+ */
+
+const struct sieve_operand_class sieve_message_override_operand_class =
+	{ "header-override" };
+
+bool sieve_opr_message_override_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	struct sieve_message_override svmo;
+	const struct sieve_message_override_def *hodef;
+
+	if ( !sieve_opr_object_dump
+		(denv, &sieve_message_override_operand_class, address, &svmo.object) )
+		return FALSE;
+
+	hodef = svmo.def =
+		(const struct sieve_message_override_def *) svmo.object.def;
+
+	if ( hodef->dump_context != NULL ) {
+		sieve_code_descend(denv);
+		if ( !hodef->dump_context(&svmo, denv, address) ) {
+			return FALSE;
+		}
+		sieve_code_ascend(denv);
+	}
+
+	return TRUE;
+}
+
+int sieve_opr_message_override_read
+(const struct sieve_runtime_env *renv, sieve_size_t *address,
+	struct sieve_message_override *svmo)
+{
+	const struct sieve_message_override_def *hodef;
+	int ret;
+
+	svmo->context = NULL;
+
+	if ( !sieve_opr_object_read
+		(renv, &sieve_message_override_operand_class, address, &svmo->object) )
+		return SIEVE_EXEC_BIN_CORRUPT;
+
+	hodef = svmo->def =
+		(const struct sieve_message_override_def *) svmo->object.def;
+
+	if ( hodef->read_context != NULL &&
+		(ret=hodef->read_context(svmo, renv, address, &svmo->context)) <= 0 )
+		return ret;
+
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Optional operands
+ */
+
+int sieve_message_opr_optional_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address,
+	signed int *opt_code)
+{
+	signed int _opt_code = 0;
+	bool final = FALSE, opok = TRUE;
+
+	if ( opt_code == NULL ) {
+		opt_code = &_opt_code;
+		final = TRUE;
+	}
+
+	while ( opok ) {
+		int opt;
+
+		if ( (opt=sieve_addrmatch_opr_optional_dump
+			(denv, address, opt_code)) <= 0 )
+			return opt;
+
+		if ( *opt_code == SIEVE_OPT_MESSAGE_OVERRIDE ) {
+			opok = sieve_opr_message_override_dump(denv, address);
+		} else {
+			return ( final ? -1 : 1 );
+		}
+	}
+
+	return -1;
+}
+
+int sieve_message_opr_optional_read
+(const struct sieve_runtime_env *renv, sieve_size_t *address,
+	signed int *opt_code, int *exec_status,
+	struct sieve_address_part *addrp, struct sieve_match_type *mcht,
+	struct sieve_comparator *cmp, 
+	ARRAY_TYPE(sieve_message_override) *svmos)
+{
+	signed int _opt_code = 0;
+	bool final = FALSE;
+	int ret;
+
+	if ( opt_code == NULL ) {
+		opt_code = &_opt_code;
+		final = TRUE;
+	}
+
+	if ( exec_status != NULL )
+		*exec_status = SIEVE_EXEC_OK;
+
+	for ( ;; ) {
+		int opt;
+
+		if ( (opt=sieve_addrmatch_opr_optional_read
+			(renv, address, opt_code, exec_status, addrp, mcht, cmp)) <= 0 )
+			return opt;
+
+		if ( *opt_code == SIEVE_OPT_MESSAGE_OVERRIDE ) {
+			struct sieve_message_override svmo;
+			const struct sieve_message_override *svmo_idx;
+			unsigned int count, i;
+
+			if ( (ret=sieve_opr_message_override_read
+				(renv, address, &svmo)) <= 0 ) {
+				if ( exec_status != NULL )
+					*exec_status = ret;
+				return -1;
+			}
+
+			if ( !array_is_created(svmos) )
+				t_array_init(svmos, 8);
+			/* insert in sorted sequence */
+			svmo_idx = array_get(svmos, &count);
+			for (i = 0; i < count; i++) {
+				if (svmo.def->sequence < svmo_idx[i].def->sequence) {
+					array_insert(svmos, i, &svmo, 1);
+					break;
+				}
+			}
+			if (count == i)
+				array_append(svmos, &svmo, 1);
+		} else {
+			if ( final ) {
+				sieve_runtime_trace_error(renv, "invalid optional operand");
+				if ( exec_status != NULL )
+					*exec_status = SIEVE_EXEC_BIN_CORRUPT;
+				return -1;
+			}
+			return 1;
+		}
+	}
+
+	i_unreached();
+	return -1;
+}
+
+/*
+ * Message header
+ */
+
+int sieve_message_get_header_fields
+(const struct sieve_runtime_env *renv,
+	struct sieve_stringlist *field_names,
+	ARRAY_TYPE(sieve_message_override) *svmos,
+	bool mime_decode, struct sieve_stringlist **fields_r)
+{
+	const struct sieve_message_override *svmo;
+	unsigned int count, i;
+	int ret;
+
+	if ( svmos == NULL || !array_is_created(svmos) ||
+		array_count(svmos) == 0 ) {
+		struct sieve_header_list *headers;
+		headers = sieve_message_header_list_create
+			(renv, field_names, mime_decode);
+		*fields_r = &headers->strlist;
+		return SIEVE_EXEC_OK;
+	}
+
+	svmo = array_get(svmos, &count);
+	if ( svmo[0].def->sequence == 0 &&
+		svmo[0].def->header_override != NULL ) {
+		*fields_r = field_names;
+	} else {
+		struct sieve_header_list *headers;
+		headers = sieve_message_header_list_create
+			(renv, field_names, mime_decode);
+		*fields_r = &headers->strlist;
+	}
+
+	for ( i = 0; i < count; i++ ) {
+		if ( svmo[i].def->header_override != NULL &&
+			(ret=svmo[i].def->header_override
+				(&svmo[i], renv, mime_decode, fields_r)) <= 0 )
+			return ret;
+	}
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Message part
+ */
+
+struct sieve_message_part *sieve_message_part_parent
+(struct sieve_message_part *mpart)
+{
+	return mpart->parent;
+}
+
+struct sieve_message_part *sieve_message_part_next
+(struct sieve_message_part *mpart)
+{
+	return mpart->next;
+}
+
+struct sieve_message_part *sieve_message_part_children
+(struct sieve_message_part *mpart)
+{
+	return mpart->children;
+}
+
+const char *sieve_message_part_content_type
+(struct sieve_message_part *mpart)
+{
+	return mpart->content_type;
+}
+
+const char *sieve_message_part_content_disposition
+(struct sieve_message_part *mpart)
+{
+	return mpart->content_disposition;
+}
+
+int sieve_message_part_get_first_header
+(struct sieve_message_part *mpart, const char *field,
+	const char **value_r)
+{
+	const struct sieve_message_header *headers;
+	unsigned int i, count;
+
+	headers = array_get(&mpart->headers, &count);
+	for ( i = 0; i < count; i++ ) {
+		if ( strcasecmp( headers[i].name, field) == 0 ) {
+			i_assert( headers[i].value[headers[i].value_len] == '\0' );
+			*value_r = (const char *)headers[i].value;
+			return 1;
+		}
+	}
+
+	*value_r = NULL;
+	return 0;
+}
+
+void sieve_message_part_get_data
+(struct sieve_message_part *mpart,
+	struct sieve_message_part_data *data, bool text)
+{
+	i_zero(data);
+	data->content_type = mpart->content_type;
+	data->content_disposition = mpart->content_disposition;
+
+	if ( !text ) {
+		data->content = mpart->decoded_body;
+		data->size = mpart->decoded_body_size;
+	} else if ( mpart->children != NULL ) {
+		data->content = "";
+		data->size = 0;
+	} else {
+		data->content = mpart->text_body;
+		data->size = mpart->text_body_size;
+	}
+}
+
+/*
+ * Message body
+ */
+
+static void str_replace_nuls(string_t *str)
+{
+	char *data = str_c_modifiable(str);
+	unsigned int i, len = str_len(str);
+
+	for (i = 0; i < len; i++) {
+		if (data[i] == '\0')
+			data[i] = ' ';
+	}
+}
+
+static bool _is_wanted_content_type
+(const char * const *wanted_types, const char *content_type)
+ATTR_NULL(1)
+{
+	const char *subtype;
+	size_t type_len;
+
+	if ( wanted_types == NULL )
+		return TRUE;
+
+	subtype = strchr(content_type, '/');
+	type_len = ( subtype == NULL ? strlen(content_type) :
+		(size_t)(subtype - content_type) );
+
+	i_assert( wanted_types != NULL );
+
+	for (; *wanted_types != NULL; wanted_types++) {
+		const char *wanted_subtype;
+
+		if (**wanted_types == '\0') {
+			/* empty string matches everything */
+			return TRUE;
+		}
+
+		wanted_subtype = strchr(*wanted_types, '/');
+		if (wanted_subtype == NULL) {
+			/* match only main type */
+			if (strlen(*wanted_types) == type_len &&
+			  strncasecmp(*wanted_types, content_type, type_len) == 0)
+				return TRUE;
+		} else {
+			/* match whole type/subtype */
+			if (strcasecmp(*wanted_types, content_type) == 0)
+				return TRUE;
+		}
+	}
+	return FALSE;
+}
+
+static bool sieve_message_body_get_return_parts
+(const struct sieve_runtime_env *renv,
+	const char * const *wanted_types,
+	bool extract_text)
+{
+	struct sieve_message_context *msgctx = renv->msgctx;
+	struct sieve_message_part *const *body_parts;
+	unsigned int i, count;
+	struct sieve_message_part_data *return_part;
+
+	/* Check whether any body parts are cached already */
+	body_parts = array_get(&msgctx->cached_body_parts, &count);
+	if ( count == 0 )
+		return FALSE;
+
+	/* Clear result array */
+	array_clear(&msgctx->return_body_parts);
+
+	/* Fill result array with requested content_types */
+	for (i = 0; i < count; i++) {
+		if (!body_parts[i]->have_body) {
+			/* Part has no body; according to RFC this MUST not match to anything and
+			 * therefore it is not included in the result.
+			 */
+			continue;
+		}
+
+		/* Skip content types that are not requested */
+		if (!_is_wanted_content_type
+			(wanted_types, body_parts[i]->content_type))
+			continue;
+
+		/* Add new item to the result */
+		return_part = array_append_space(&msgctx->return_body_parts);
+		return_part->content_type = body_parts[i]->content_type;
+		return_part->content_disposition = body_parts[i]->content_disposition;
+
+		/* Depending on whether a decoded body part is requested, the appropriate
+		 * cache item is read. If it is missing, this function fails and the cache
+		 * needs to be completed by sieve_message_parts_add_missing().
+		 */
+		if (extract_text) {
+			if (body_parts[i]->text_body == NULL)
+				return FALSE;
+			return_part->content = body_parts[i]->text_body;
+			return_part->size = body_parts[i]->text_body_size;
+		} else {
+			if (body_parts[i]->decoded_body == NULL)
+				return FALSE;
+			return_part->content = body_parts[i]->decoded_body;
+			return_part->size = body_parts[i]->decoded_body_size;				
+		}
+	}
+
+	return TRUE;
+}
+
+static void sieve_message_part_save
+(const struct sieve_runtime_env *renv, buffer_t *buf,
+	struct sieve_message_part *body_part,
+	bool extract_text)
+{
+	struct sieve_message_context *msgctx = renv->msgctx;
+	pool_t pool = msgctx->context_pool;
+	buffer_t *result_buf, *text_buf = NULL;
+	char *part_data;
+	size_t part_size;
+
+	/* Extract text if requested */
+	result_buf = buf;
+	if ( extract_text && body_part->children == NULL &&
+		!body_part->epilogue ) {
+
+		if ( buf->used > 0 && mail_html2text_content_type_match
+			(body_part->content_type) ) {
+			struct mail_html2text *html2text;
+
+			text_buf = buffer_create_dynamic(default_pool, 4096);
+
+			/* Remove HTML markup */
+			html2text = mail_html2text_init(0);
+			mail_html2text_more(html2text, buf->data, buf->used, text_buf);
+			mail_html2text_deinit(&html2text);
+
+			result_buf = text_buf;
+		}
+	}
+
+	/* Add terminating NUL to the body part buffer */
+	buffer_append_c(result_buf, '\0');
+
+	/* Make copy of the buffer */
+	part_data = p_malloc(pool, result_buf->used);
+	memcpy(part_data, result_buf->data, result_buf->used);
+	part_size = result_buf->used - 1;
+
+	/* Free text buffer if used */
+	if ( text_buf != NULL)
+		buffer_free(&text_buf);
+
+	/* Depending on whether the part is processed into text, store message
+	 * body in the appropriate cache location.
+	 */
+	if ( !extract_text ) {
+		body_part->decoded_body = part_data;
+		body_part->decoded_body_size = part_size;
+	} else {
+		body_part->text_body = part_data;
+		body_part->text_body_size = part_size;
+	}
+
+	/* Clear buffer */
+	buffer_set_used_size(buf, 0);
+}
+
+static const char *
+_parse_content_type(const struct message_header_line *hdr)
+{
+	struct rfc822_parser_context parser;
+	string_t *content_type;
+
+	/* Initialize parsing */
+	rfc822_parser_init(&parser, hdr->full_value, hdr->full_value_len, NULL);
+	(void)rfc822_skip_lwsp(&parser);
+
+	/* Parse content type */
+	content_type = t_str_new(64);
+	if (rfc822_parse_content_type(&parser, content_type) < 0)
+		return "";
+
+	/* Content-type value must end here, otherwise it is invalid after all */
+	(void)rfc822_skip_lwsp(&parser);
+	if ( parser.data != parser.end && *parser.data != ';' )
+		return "";
+
+	/* Success */
+	return str_c(content_type);
+}
+
+static const char *
+_parse_content_disposition(const struct message_header_line *hdr)
+{
+	struct rfc822_parser_context parser;
+	string_t *content_disp;
+
+	/* Initialize parsing */
+	rfc822_parser_init(&parser, hdr->full_value, hdr->full_value_len, NULL);
+	(void)rfc822_skip_lwsp(&parser);
+
+	/* Parse content type */
+	content_disp = t_str_new(64);
+	if (rfc822_parse_mime_token(&parser, content_disp) < 0)
+		return "";
+
+	/* Content-type value must end here, otherwise it is invalid after all */
+	(void)rfc822_skip_lwsp(&parser);
+	if ( parser.data != parser.end && *parser.data != ';' )
+		return "";
+
+	/* Success */
+	return str_c(content_disp);
+}
+
+/* sieve_message_parts_add_missing():
+ *   Add requested message body parts to the cache that are missing.
+ */
+static int sieve_message_parts_add_missing
+(const struct sieve_runtime_env *renv,
+	const char *const *content_types,
+	bool extract_text, bool iter_all)
+	ATTR_NULL(2)
+{
+	struct sieve_message_context *msgctx = renv->msgctx;
+	pool_t pool = msgctx->context_pool;
+	struct mail *mail = sieve_message_get_mail(renv->msgctx);
+	struct message_parser_settings mparser_set = {
+		.hdr_flags = MESSAGE_HEADER_PARSER_FLAG_SKIP_INITIAL_LWSP,
+		.flags = MESSAGE_PARSER_FLAG_INCLUDE_MULTIPART_BLOCKS,
+	};
+	ARRAY(struct sieve_message_header) headers;
+	struct sieve_message_part *body_part, *header_part, *last_part;
+	struct message_parser_ctx *parser;
+	struct message_decoder_context *decoder;
+	struct message_block block, decoded;
+	struct message_part *mparts, *prev_mpart = NULL;
+	buffer_t *buf;
+	struct istream *input;
+	unsigned int idx = 0;
+	bool save_body = FALSE, have_all;
+	string_t *hdr_content = NULL;
+
+	/* First check whether any are missing */
+	if ( !iter_all && sieve_message_body_get_return_parts
+		(renv, content_types, extract_text) ) {
+		/* Cache hit; all are present */
+		return SIEVE_EXEC_OK;
+	}
+
+	/* Get the message stream */
+	if ( mail_get_stream(mail, NULL, NULL, &input) < 0 ) {
+		return sieve_runtime_mail_error(renv, mail,
+			"failed to open input message");
+	}
+	if (mail_get_parts(mail, &mparts) < 0) {
+		return sieve_runtime_mail_error(renv, mail,
+			"failed to parse input message parts");
+	}
+
+	buf = buffer_create_dynamic(default_pool, 4096);
+	body_part = header_part = last_part = NULL;
+
+	if (iter_all) {
+		t_array_init(&headers, 64);
+		hdr_content = t_str_new(512);
+		mparser_set.hdr_flags |= MESSAGE_HEADER_PARSER_FLAG_CLEAN_ONELINE;
+	} else {
+		i_zero(&headers);
+	}
+
+	/* Initialize body decoder */
+	decoder = message_decoder_init(NULL, 0);
+
+	// FIXME: currently not tested with edit-mail.
+		//parser = message_parser_init_from_parts(parts, input,
+		// hparser_flags, mparser_flags);
+	parser = message_parser_init(pool_datastack_create(),
+		input, &mparser_set);
+	while ( message_parser_parse_next_block(parser, &block) > 0 ) {
+		struct sieve_message_part **body_part_idx;
+		struct message_header_line *hdr = block.hdr;
+		struct sieve_message_header *header;
+		unsigned char *data;
+
+		if ( block.part != prev_mpart ) {
+			bool message_rfc822 = FALSE;
+
+			/* Save previous body part */
+			if ( body_part != NULL ) {
+				/* Treat message/rfc822 separately; headers become content */
+				if ( block.part->parent == prev_mpart &&
+					strcmp(body_part->content_type, "message/rfc822") == 0 ) {
+					message_rfc822 = TRUE;
+				} else {
+					if ( save_body ) {
+						sieve_message_part_save
+							(renv, buf, body_part, extract_text);
+					}
+				}
+				if ( iter_all && !array_is_created(&body_part->headers) &&
+					array_count(&headers) > 0 ) {
+					p_array_init(&body_part->headers, pool, array_count(&headers));
+					array_copy(&body_part->headers.arr, 0,
+						&headers.arr, 0, array_count(&headers));
+				}
+			}
+
+			/* Start processing next part */
+			body_part_idx = array_idx_get_space
+				(&msgctx->cached_body_parts, idx);
+			if ( *body_part_idx == NULL )
+				*body_part_idx = p_new(pool, struct sieve_message_part, 1);
+			body_part = *body_part_idx;
+			body_part->content_type = "text/plain";
+			if ( iter_all )
+				array_clear(&headers);
+
+			/* Copy tree structure */
+			if ( block.part->context != NULL ) {
+				struct sieve_message_part *epipart =
+					(struct sieve_message_part *)block.part->context;
+				i_assert(epipart != NULL);
+
+				/* multipart epilogue */
+				body_part->content_type = epipart->content_type;
+				body_part->have_body = TRUE;
+				body_part->epilogue = TRUE;
+				save_body = iter_all || _is_wanted_content_type
+					(content_types, body_part->content_type);
+
+			} else {
+				struct sieve_message_part *parent = NULL;
+
+				if ( block.part->parent != NULL ) {
+					body_part->parent = parent =
+						(struct sieve_message_part *)
+							block.part->parent->context;
+				}
+
+				/* new part */
+				block.part->context = (void*)body_part;
+
+				if ( last_part != NULL ) {
+					i_assert( parent != NULL );
+					if ( last_part->parent == parent ) {
+						last_part->next = body_part;
+					}	else if (parent->children == NULL) {
+						parent->children = body_part;
+					} else {
+						struct sieve_message_part *child = parent->children;
+						while (child->next != NULL && child != body_part)
+							child = child->next;
+						if (child != body_part)
+							child->next = body_part;
+					}
+				}
+			}
+			last_part = body_part;
+
+			/* If this is message/rfc822 content, retain the enveloping part for
+			 * storing headers as content.
+			 */
+			if ( message_rfc822 ) {
+				i_assert(idx > 0);
+				body_part_idx = array_idx_modifiable
+					(&msgctx->cached_body_parts, idx-1);
+				header_part = *body_part_idx;
+			} else {
+				header_part = NULL;
+			}
+
+			prev_mpart = block.part;
+			idx++;
+		}
+
+		if ( hdr != NULL || block.size == 0 ) {
+			enum {
+				_HDR_CONTENT_TYPE,
+				_HDR_CONTENT_DISPOSITION,
+				_HDR_OTHER
+			} hdr_field;
+
+			/* Reading headers */
+			i_assert( body_part != NULL );
+
+			/* Decode block */
+			(void)message_decoder_decode_next_block
+				(decoder, &block, &decoded);
+
+			/* Check for end of headers */
+			if ( hdr == NULL ) {
+				/* Save headers for message/rfc822 part */
+				if ( header_part != NULL ) {
+					sieve_message_part_save
+						(renv, buf, header_part, FALSE);
+					header_part = NULL;
+				}
+
+				/* Save bodies only if we have a wanted content-type */
+				save_body = iter_all || _is_wanted_content_type
+					(content_types, body_part->content_type);
+				continue;
+			}
+
+			/* Encountered the empty line that indicates the end of the headers and
+			 * the start of the body
+			 */
+			if ( hdr->eoh ) {
+				body_part->have_body = TRUE;
+				continue;
+			} else if ( header_part != NULL ) {
+				/* Save message/rfc822 header as part content */
+				if ( hdr->continued ) {
+					buffer_append(buf, hdr->value, hdr->value_len);
+				} else {
+					buffer_append(buf, hdr->name, hdr->name_len);
+					buffer_append(buf, hdr->middle, hdr->middle_len);
+					buffer_append(buf, hdr->value, hdr->value_len);
+				}
+				if ( !hdr->no_newline ) {
+					buffer_append(buf, "\r\n", 2);
+				}
+			}
+
+			if ( strcasecmp(hdr->name, "Content-Type" ) == 0 )
+				hdr_field = _HDR_CONTENT_TYPE;
+			else if ( strcasecmp(hdr->name, "Content-Disposition" ) == 0 )
+				hdr_field = _HDR_CONTENT_DISPOSITION;
+			else if ( iter_all && !array_is_created(&body_part->headers) )
+				hdr_field = _HDR_OTHER;
+			else {
+				/* Not interested in this header */
+				continue;
+			}
+
+			/* Header can have folding whitespace. Acquire the full value before
+			 * continuing
+			 */
+			if ( hdr->continues ) {
+				hdr->use_full_value = TRUE;
+				continue;
+			}
+
+			if ( iter_all && !array_is_created(&body_part->headers) ) {
+				const unsigned char *value, *vp;
+				size_t vlen;
+
+				/* Add header */
+				header = array_append_space(&headers);
+				header->name = p_strdup(pool, hdr->name);
+
+				/* Trim end of field value (not done by parser) */
+				value = hdr->full_value;
+				vp = value + hdr->full_value_len;
+				while ( vp > value &&
+					(vp[-1] == '\t' || vp[-1] == ' ') )
+					vp--;
+				vlen = (size_t)(vp - value);
+	
+				/* Decode MIME encoded-words. */
+				str_truncate(hdr_content, 0);
+				message_header_decode_utf8
+					(value, vlen, hdr_content, NULL);
+				if ( vlen != str_len(hdr_content) ||
+					strncmp(str_c(hdr_content), (const char *)value,
+						vlen) != 0 ) {
+					if ( strlen(str_c(hdr_content)) != str_len(hdr_content) ) {
+						/* replace NULs with spaces */
+						str_replace_nuls(hdr_content);
+					}
+					/* store raw */
+					data = p_malloc(pool, vlen + 1);
+					data[vlen] = '\0';
+					header->value = memcpy(data, value, vlen);
+					header->value_len = vlen;
+					/* store decoded */
+					data = p_malloc(pool, str_len(hdr_content) + 1);
+					data[str_len(hdr_content)] = '\0';
+					header->utf8_value = memcpy(data,
+						str_data(hdr_content), str_len(hdr_content));
+					header->utf8_value_len = str_len(hdr_content);
+				} else {
+					/* raw == decoded */
+					data = p_malloc(pool, vlen + 1);
+					data[vlen] = '\0';
+					header->value = header->utf8_value =
+						memcpy(data, value, vlen);
+					header->value_len = header->utf8_value_len = vlen;
+				}
+
+				if ( hdr_field == _HDR_OTHER )
+					continue;
+			}
+
+			/* Parse the content type from the Content-type header */
+			T_BEGIN {
+				switch ( hdr_field ) {
+				case _HDR_CONTENT_TYPE:
+					body_part->content_type =
+						p_strdup(pool, _parse_content_type(block.hdr));
+					break;
+				case _HDR_CONTENT_DISPOSITION:
+					body_part->content_disposition =
+						p_strdup(pool, _parse_content_disposition(block.hdr));
+					break;
+				default:
+					i_unreached();
+				}
+			} T_END;
+
+			continue;
+		}
+
+		/* Reading body */
+		if ( save_body ) {
+			(void)message_decoder_decode_next_block
+					(decoder, &block, &decoded);
+			buffer_append(buf, decoded.data, decoded.size);
+		}
+	}
+
+	/* even with an empty message there was at least the "end of headers"
+	   block, which set the body_part. */
+	i_assert( body_part != NULL );
+
+	/* Save last body part if necessary */
+	if ( header_part != NULL ) {
+		sieve_message_part_save
+			(renv, buf, header_part, FALSE);
+	} else if ( save_body ) {
+		sieve_message_part_save
+			(renv, buf, body_part, extract_text);
+	}
+	if ( iter_all && !array_is_created(&body_part->headers) &&
+		array_count(&headers) > 0 ) {
+		p_array_init(&body_part->headers, pool, array_count(&headers));
+		array_copy(&body_part->headers.arr, 0,
+			&headers.arr, 0, array_count(&headers));
+	}
+
+	/* Try to fill the return_body_parts array once more */
+	have_all = iter_all || sieve_message_body_get_return_parts
+		(renv, content_types, extract_text);
+
+	/* This time, failure is a bug */
+	i_assert(have_all);
+
+	/* Cleanup */
+	(void)message_parser_deinit(&parser, &mparts);
+	message_decoder_deinit(&decoder);
+	buffer_free(&buf);
+
+	/* Return status */
+	if ( input->stream_errno != 0 ) {
+		sieve_runtime_critical(renv, NULL,
+			"failed to read input message",
+			"read(%s) failed: %s",
+			i_stream_get_name(input),
+			i_stream_get_error(input));
+		return SIEVE_EXEC_TEMP_FAILURE;
+	}
+	return SIEVE_EXEC_OK;
+}
+
+int sieve_message_body_get_content
+(const struct sieve_runtime_env *renv,
+	const char * const *content_types,
+	struct sieve_message_part_data **parts_r)
+{
+	struct sieve_message_context *msgctx = renv->msgctx;
+	int status;
+
+	T_BEGIN {
+		/* Fill the return_body_parts array */
+		status = sieve_message_parts_add_missing
+			(renv, content_types, FALSE, FALSE);
+	} T_END;
+
+	/* Check status */
+	if ( status <= 0 )
+		return status;
+
+	/* Return the array of body items */
+	(void) array_append_space(&msgctx->return_body_parts); /* NULL-terminate */
+	*parts_r = array_idx_modifiable(&msgctx->return_body_parts, 0);
+
+	return status;
+}
+
+int sieve_message_body_get_text
+(const struct sieve_runtime_env *renv,
+	struct sieve_message_part_data **parts_r)
+{
+	static const char * const _text_content_types[] =
+		{ "application/xhtml+xml", "text", NULL };
+	struct sieve_message_context *msgctx = renv->msgctx;
+	int status;
+
+	/* We currently only support extracting plain text from:
+
+	    - text/html -> HTML
+	    - application/xhtml+xml -> XHTML
+
+	   Other text types are read as is. Any non-text types are skipped.
+	 */
+
+	T_BEGIN {
+		/* Fill the return_body_parts array */
+		status = sieve_message_parts_add_missing
+			(renv, _text_content_types, TRUE, FALSE);
+	} T_END;
+
+	/* Check status */
+	if ( status <= 0 )
+		return status;
+
+	/* Return the array of body items */
+	(void) array_append_space(&msgctx->return_body_parts); /* NULL-terminate */
+	*parts_r = array_idx_modifiable(&msgctx->return_body_parts, 0);
+
+	return status;
+}
+
+int sieve_message_body_get_raw
+(const struct sieve_runtime_env *renv,
+	struct sieve_message_part_data **parts_r)
+{
+	struct sieve_message_context *msgctx = renv->msgctx;
+	struct sieve_message_part_data *return_part;
+	buffer_t *buf;
+
+	if ( msgctx->raw_body == NULL ) {
+		struct mail *mail = sieve_message_get_mail(renv->msgctx);
+		struct istream *input;
+		struct message_size hdr_size, body_size;
+		const unsigned char *data;
+		size_t size;
+		int ret;
+
+		msgctx->raw_body = buf = buffer_create_dynamic
+			(msgctx->context_pool, 1024*64);
+
+		/* Get stream for message */
+ 		if ( mail_get_stream(mail, &hdr_size, &body_size, &input) < 0 ) {
+			return sieve_runtime_mail_error(renv, mail,
+				"failed to open input message");
+		}
+
+		/* Skip stream to beginning of body */
+		i_stream_skip(input, hdr_size.physical_size);
+
+		/* Read raw message body */
+		while ( (ret=i_stream_read_more(input, &data, &size)) > 0 ) {
+			buffer_append(buf, data, size);
+
+			i_stream_skip(input, size);
+		}
+
+		if ( ret < 0 && input->stream_errno != 0 ) {
+			sieve_runtime_critical(renv, NULL,
+				"failed to read input message",
+				"read(%s) failed: %s",
+				i_stream_get_name(input),
+				i_stream_get_error(input));
+			return SIEVE_EXEC_TEMP_FAILURE;
+		}
+
+		/* Add terminating NUL to the body part buffer */
+		buffer_append_c(buf, '\0');
+
+	} else {
+		buf = msgctx->raw_body;
+	}
+
+	/* Clear result array */
+	array_clear(&msgctx->return_body_parts);
+
+	if ( buf->used > 1  ) {
+		const char *data = (const char *)buf->data;
+		size_t size = buf->used - 1;
+
+		i_assert( data[size] == '\0' );
+
+		/* Add single item to the result */
+		return_part = array_append_space(&msgctx->return_body_parts);
+		return_part->content = data;
+		return_part->size = size;
+	}
+
+	/* Return the array of body items */
+	(void) array_append_space(&msgctx->return_body_parts); /* NULL-terminate */
+	*parts_r = array_idx_modifiable(&msgctx->return_body_parts, 0);
+
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Message part iterator
+ */
+
+int sieve_message_part_iter_init
+(struct sieve_message_part_iter *iter,
+	const struct sieve_runtime_env *renv)
+{
+	struct sieve_message_context *msgctx = renv->msgctx;
+	struct sieve_message_part *const *parts;
+	unsigned int count;
+	int status;
+
+	T_BEGIN {
+		/* Fill the return_body_parts array */
+		status = sieve_message_parts_add_missing
+			(renv, NULL, TRUE, TRUE);
+	} T_END;
+
+	/* Check status */
+	if ( status <= 0 )
+		return status;
+
+	i_zero(iter);
+	iter->renv = renv;
+	iter->index = 0;
+	iter->offset = 0;
+
+	parts = array_get(&msgctx->cached_body_parts, &count);
+	if (count == 0)
+		iter->root = NULL;
+	else
+		iter->root = parts[0];
+
+	return SIEVE_EXEC_OK;
+}
+
+void sieve_message_part_iter_subtree(struct sieve_message_part_iter *iter,
+	struct sieve_message_part_iter *subtree)
+{
+	const struct sieve_runtime_env *renv = iter->renv;
+	struct sieve_message_context *msgctx = renv->msgctx;
+	struct sieve_message_part *const *parts;
+	unsigned int count;
+
+	*subtree = *iter;
+
+	parts = array_get(&msgctx->cached_body_parts, &count);
+	if ( subtree->index >= count)
+		subtree->root = NULL;
+	else
+		subtree->root = parts[subtree->index];
+	subtree->offset = subtree->index;
+}
+
+void sieve_message_part_iter_children(struct sieve_message_part_iter *iter,
+	struct sieve_message_part_iter *child)
+{
+	const struct sieve_runtime_env *renv = iter->renv;
+	struct sieve_message_context *msgctx = renv->msgctx;
+	struct sieve_message_part *const *parts;
+	unsigned int count;
+
+	*child = *iter;
+
+	parts = array_get(&msgctx->cached_body_parts, &count);	
+	if ( (child->index+1) >= count || parts[child->index]->children == NULL)
+		child->root = NULL;
+	else
+		child->root = parts[child->index++];
+	child->offset = child->index;
+}
+
+struct sieve_message_part *sieve_message_part_iter_current
+(struct sieve_message_part_iter *iter)
+{
+	const struct sieve_runtime_env *renv = iter->renv;
+	struct sieve_message_context *msgctx = renv->msgctx;
+	struct sieve_message_part *const *parts;
+	unsigned int count;
+
+	if ( iter->root == NULL )
+		return NULL;
+
+	parts = array_get(&msgctx->cached_body_parts, &count);
+	if ( iter->index >= count )
+		return NULL;
+	do {
+		if ( parts[iter->index] == iter->root->next )
+			return NULL;
+		if ( parts[iter->index] == iter->root->parent )
+			return NULL;
+	} while ( parts[iter->index]->epilogue && ++iter->index < count );
+	if ( iter->index >= count )
+		return NULL;
+	return parts[iter->index];
+}
+
+struct sieve_message_part *sieve_message_part_iter_next
+(struct sieve_message_part_iter *iter)
+{
+	const struct sieve_runtime_env *renv = iter->renv;
+	struct sieve_message_context *msgctx = renv->msgctx;
+
+	if ( iter->index >= array_count(&msgctx->cached_body_parts) )
+		return NULL;
+	iter->index++;
+
+	return sieve_message_part_iter_current(iter);
+}
+
+void sieve_message_part_iter_reset
+(struct sieve_message_part_iter *iter)
+{
+	iter->index = iter->offset;
+}
+
+/*
+ * MIME header list
+ */
+
+/* Forward declarations */
+
+static int sieve_mime_header_list_next_item
+	(struct sieve_header_list *_hdrlist, const char **name_r,
+		string_t **value_r);
+static int sieve_mime_header_list_next_value
+	(struct sieve_stringlist *_strlist, string_t **value_r);
+static void sieve_mime_header_list_reset
+	(struct sieve_stringlist *_strlist);
+
+/* Header list object */
+
+struct sieve_mime_header_list {
+	struct sieve_header_list hdrlist;
+
+	struct sieve_stringlist *field_names;
+
+	struct sieve_message_part_iter part_iter;
+
+	const char *header_name;
+	const struct sieve_message_header *headers;
+	unsigned int headers_index, headers_count;
+
+	bool mime_decode:1;
+	bool children:1;
+};
+
+struct sieve_header_list *sieve_mime_header_list_create
+(const struct sieve_runtime_env *renv,
+	struct sieve_stringlist *field_names,
+	struct sieve_message_part_iter *part_iter,
+	bool mime_decode, bool children)
+{
+	struct sieve_mime_header_list *hdrlist;
+
+	hdrlist = t_new(struct sieve_mime_header_list, 1);
+	hdrlist->hdrlist.strlist.runenv = renv;
+	hdrlist->hdrlist.strlist.exec_status = SIEVE_EXEC_OK;
+	hdrlist->hdrlist.strlist.next_item = sieve_mime_header_list_next_value;
+	hdrlist->hdrlist.strlist.reset = sieve_mime_header_list_reset;
+	hdrlist->hdrlist.next_item = sieve_mime_header_list_next_item;
+	hdrlist->field_names = field_names;
+	hdrlist->mime_decode = mime_decode;
+	hdrlist->children = children;
+
+	sieve_message_part_iter_subtree(part_iter, &hdrlist->part_iter);
+
+	return &hdrlist->hdrlist;
+}
+
+/* MIME list implementation */
+
+static void sieve_mime_header_list_next_name
+(struct sieve_mime_header_list *hdrlist)
+{
+	struct sieve_message_part *mpart;
+
+	sieve_message_part_iter_reset(&hdrlist->part_iter);
+	mpart = sieve_message_part_iter_current(&hdrlist->part_iter);
+
+	if ( mpart != NULL && array_is_created(&mpart->headers) ) {
+		hdrlist->headers = array_get
+			(&mpart->headers, &hdrlist->headers_count);
+		hdrlist->headers_index = 0;
+	}
+}
+
+static int sieve_mime_header_list_next_item
+(struct sieve_header_list *_hdrlist, const char **name_r,
+	string_t **value_r)
+{
+	struct sieve_mime_header_list *hdrlist =
+		(struct sieve_mime_header_list *) _hdrlist;
+	const struct sieve_runtime_env *renv = _hdrlist->strlist.runenv;
+
+	if ( name_r != NULL )
+		*name_r = NULL;
+	*value_r = NULL;
+
+	for (;;) {
+		/* Check for end of current header list */
+		if ( hdrlist->headers_count == 0 ||
+			hdrlist->headers_index >= hdrlist->headers_count ) {
+			hdrlist->headers_count = 0;
+			hdrlist->headers_index = 0;
+			hdrlist->headers = NULL;
+		}
+
+		/* Fetch more headers */
+		while ( hdrlist->headers_count == 0 ) {
+			string_t *hdr_item = NULL;
+			int ret;
+
+			if ( hdrlist->header_name != NULL && hdrlist->children ) {
+				struct sieve_message_part *mpart;
+
+				mpart = sieve_message_part_iter_next(&hdrlist->part_iter);
+				if ( mpart != NULL && array_is_created(&mpart->headers) ) {
+					hdrlist->headers = array_get
+						(&mpart->headers, &hdrlist->headers_count);
+					hdrlist->headers_index = 0;
+				}
+				if ( hdrlist->headers_count > 0 ) {
+					if ( _hdrlist->strlist.trace ) {
+						sieve_runtime_trace(renv, 0,
+							"moving to next message part");
+					}
+					break;
+				}
+			}
+
+			/* Read next header name from source list */
+			if ( (ret=sieve_stringlist_next_item
+				(hdrlist->field_names, &hdr_item)) <= 0 )
+				return ret;
+
+			hdrlist->header_name = str_c(hdr_item);
+
+			if ( _hdrlist->strlist.trace ) {
+				sieve_runtime_trace(renv, 0,
+					"extracting `%s' headers from message part",
+					str_sanitize(str_c(hdr_item), 80));
+			}
+
+			sieve_mime_header_list_next_name(hdrlist);
+		}
+
+		for ( ; hdrlist->headers_index < hdrlist->headers_count;
+			hdrlist->headers_index++ ) {
+			const struct sieve_message_header *header =
+				&hdrlist->headers[hdrlist->headers_index];
+
+			if ( strcasecmp(header->name, hdrlist->header_name) == 0 ) {
+				if ( name_r != NULL )
+					*name_r = hdrlist->header_name;
+				if ( hdrlist->mime_decode ) {
+					*value_r = t_str_new_const
+						((const char *)header->utf8_value, header->utf8_value_len);
+				} else {
+					*value_r = t_str_new_const
+						((const char *)header->value, header->value_len);
+				}
+				hdrlist->headers_index++;
+				return 1;
+			}
+		}
+	}
+	
+	i_unreached();	
+	return -1;
+}
+
+static int sieve_mime_header_list_next_value
+(struct sieve_stringlist *_strlist, string_t **value_r)
+{
+	struct sieve_header_list *hdrlist =
+		(struct sieve_header_list *) _strlist;
+
+	return sieve_mime_header_list_next_item
+		(hdrlist, NULL, value_r);
+}
+
+static void sieve_mime_header_list_reset
+(struct sieve_stringlist *strlist)
+{
+	struct sieve_mime_header_list *hdrlist =
+		(struct sieve_mime_header_list *) strlist;
+
+	sieve_stringlist_reset(hdrlist->field_names);
+	hdrlist->header_name = NULL;
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-message.h b/pigeonhole/src/lib-sieve/sieve-message.h
new file mode 100644
index 0000000..4cb77cc
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-message.h
@@ -0,0 +1,280 @@
+#ifndef SIEVE_MESSAGE_H
+#define SIEVE_MESSAGE_H
+
+#include "sieve-common.h"
+#include "sieve-stringlist.h"
+#include "sieve-objects.h"
+
+/*
+ * Message transmission
+ */
+
+const char *sieve_message_get_new_id(const struct sieve_instance *svinst);
+
+/*
+ * Message context
+ */
+
+struct sieve_message_context;
+
+struct sieve_message_context *sieve_message_context_create
+	(struct sieve_instance *svinst, struct mail_user *mail_user,
+		const struct sieve_message_data *msgdata);
+void sieve_message_context_ref(struct sieve_message_context *msgctx);
+void sieve_message_context_unref(struct sieve_message_context **msgctx);
+
+void sieve_message_context_reset(struct sieve_message_context *msgctx);
+
+pool_t sieve_message_context_pool
+	(struct sieve_message_context *msgctx) ATTR_PURE;
+void sieve_message_context_time(struct sieve_message_context *msgctx,
+	struct timeval *time);
+
+/* Extension support */
+
+void sieve_message_context_extension_set
+	(struct sieve_message_context *msgctx, const struct sieve_extension *ext,
+		void *context);
+const void *sieve_message_context_extension_get
+	(struct sieve_message_context *msgctx, const struct sieve_extension *ext);
+
+/* Envelope */
+
+const struct smtp_address *sieve_message_get_final_recipient
+	(struct sieve_message_context *msgctx);
+const struct smtp_address *sieve_message_get_orig_recipient
+	(struct sieve_message_context *msgctx);
+
+const struct smtp_address *sieve_message_get_sender
+	(struct sieve_message_context *msgctx);
+
+/* Mail */
+
+struct mail *sieve_message_get_mail
+	(struct sieve_message_context *msgctx);
+
+int sieve_message_substitute
+	(struct sieve_message_context *msgctx, struct istream *input);
+struct edit_mail *sieve_message_edit
+	(struct sieve_message_context *msgctx);
+void sieve_message_snapshot
+	(struct sieve_message_context *msgctx);
+
+/*
+ * Header stringlist
+ */
+
+struct sieve_header_list {
+	struct sieve_stringlist strlist;
+
+	int (*next_item)
+		(struct sieve_header_list *_hdrlist, const char **name_r,
+			string_t **value_r) ATTR_NULL(2);
+};
+
+static inline int sieve_header_list_next_item
+(struct sieve_header_list *hdrlist, const char **name_r,
+	string_t **value_r) ATTR_NULL(2)
+{
+	return hdrlist->next_item(hdrlist, name_r, value_r);
+}
+
+static inline void sieve_header_list_reset
+(struct sieve_header_list *hdrlist)
+{
+	sieve_stringlist_reset(&hdrlist->strlist);
+}
+
+static inline int sieve_header_list_get_length
+(struct sieve_header_list *hdrlist)
+{
+	return sieve_stringlist_get_length(&hdrlist->strlist);
+}
+
+static inline void sieve_header_list_set_trace
+(struct sieve_header_list *hdrlist, bool trace)
+{
+	sieve_stringlist_set_trace(&hdrlist->strlist, trace);
+}
+
+struct sieve_header_list *sieve_message_header_list_create
+	(const struct sieve_runtime_env *renv,
+		struct sieve_stringlist *field_names,
+		bool mime_decode);
+
+/*
+ * Message override
+ */
+
+/* Header override object */
+
+struct sieve_message_override_def {
+	struct sieve_object_def obj_def;
+
+	unsigned int sequence;
+
+	/* Context coding */
+
+	bool (*dump_context)
+		(const struct sieve_message_override *svmo,
+			const struct sieve_dumptime_env *denv, sieve_size_t *address);
+	int (*read_context)
+		(const struct sieve_message_override *svmo,
+			const struct sieve_runtime_env *renv, sieve_size_t *address,
+			void **se_context);
+
+	/* Override */
+
+	int (*header_override)
+		(const struct sieve_message_override *svmo,
+			const struct sieve_runtime_env *renv,
+			bool mime_decode, struct sieve_stringlist **headers);
+};
+
+struct sieve_message_override {
+	struct sieve_object object;
+
+	const struct sieve_message_override_def *def;
+
+	void *context;
+};
+
+ARRAY_DEFINE_TYPE(sieve_message_override,
+	struct sieve_message_override);
+
+/*
+ * Message override operand
+ */
+
+#define SIEVE_EXT_DEFINE_MESSAGE_OVERRIDE(SVMO) SIEVE_EXT_DEFINE_OBJECT(SVMO)
+#define SIEVE_EXT_DEFINE_MESSAGE_OVERRIDES(SVMOS) SIEVE_EXT_DEFINE_OBJECTS(SMOS)
+
+#define SIEVE_OPT_MESSAGE_OVERRIDE (-2)
+
+extern const struct sieve_operand_class
+	sieve_message_override_operand_class;
+
+static inline void sieve_opr_message_override_emit
+(struct sieve_binary_block *sblock, const struct sieve_extension *ext,
+	const struct sieve_message_override_def *seff)
+{
+	sieve_opr_object_emit(sblock, ext, &seff->obj_def);
+}
+
+bool sieve_opr_message_override_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+int sieve_opr_message_override_read
+	(const struct sieve_runtime_env *renv, sieve_size_t *address,
+		struct sieve_message_override *svmo);
+
+/*
+ * Optional operands
+ */
+
+int sieve_message_opr_optional_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address,
+		signed int *opt_code);
+
+int sieve_message_opr_optional_read
+	(const struct sieve_runtime_env *renv, sieve_size_t *address,
+		signed int *opt_code, int *exec_status,
+		struct sieve_address_part *addrp, struct sieve_match_type *mcht,
+		struct sieve_comparator *cmp, 
+		ARRAY_TYPE(sieve_message_override) *svmos);
+
+/*
+ * Message header
+ */
+
+int sieve_message_get_header_fields
+	(const struct sieve_runtime_env *renv,
+		struct sieve_stringlist *field_names,
+		ARRAY_TYPE(sieve_message_override) *svmos,
+		bool mime_decode, struct sieve_stringlist **fields_r);
+
+/*
+ * Message part
+ */
+
+struct sieve_message_part;
+
+struct sieve_message_part_data {
+	const char *content_type;
+	const char *content_disposition;
+
+	const char *content;
+	unsigned long size;
+};
+
+struct sieve_message_part *sieve_message_part_parent
+	(struct sieve_message_part *mpart) ATTR_PURE;
+struct sieve_message_part *sieve_message_part_next
+	(struct sieve_message_part *mpart) ATTR_PURE;
+struct sieve_message_part *sieve_message_part_children
+	(struct sieve_message_part *mpart) ATTR_PURE;
+
+const char *sieve_message_part_content_type
+	(struct sieve_message_part *mpart) ATTR_PURE;
+const char *sieve_message_part_content_disposition
+	(struct sieve_message_part *mpart) ATTR_PURE;
+
+int sieve_message_part_get_first_header
+	(struct sieve_message_part *mpart, const char *field,
+		const char **value_r);
+
+void sieve_message_part_get_data
+	(struct sieve_message_part *mpart,
+		struct sieve_message_part_data *data, bool text);
+
+/*
+ * Message body
+ */
+
+int sieve_message_body_get_content
+	(const struct sieve_runtime_env *renv,
+		const char * const *content_types,
+		struct sieve_message_part_data **parts_r);
+int sieve_message_body_get_text
+	(const struct sieve_runtime_env *renv,
+		struct sieve_message_part_data **parts_r);
+int sieve_message_body_get_raw
+	(const struct sieve_runtime_env *renv,
+		struct sieve_message_part_data **parts_r);
+
+/*
+ * Message part iterator
+ */
+
+struct sieve_message_part_iter {
+	const struct sieve_runtime_env *renv;
+	struct sieve_message_part *root;
+	unsigned int index, offset;
+};
+
+int sieve_message_part_iter_init
+(struct sieve_message_part_iter *iter,
+	const struct sieve_runtime_env *renv);
+void sieve_message_part_iter_subtree(struct sieve_message_part_iter *iter,
+	struct sieve_message_part_iter *subtree);
+void sieve_message_part_iter_children(struct sieve_message_part_iter *iter,
+	struct sieve_message_part_iter *child);
+
+struct sieve_message_part *sieve_message_part_iter_current
+(struct sieve_message_part_iter *iter);
+struct sieve_message_part *sieve_message_part_iter_next
+(struct sieve_message_part_iter *iter);
+
+void sieve_message_part_iter_reset
+(struct sieve_message_part_iter *iter);
+
+/*
+ * MIME header list
+ */
+
+struct sieve_header_list *sieve_mime_header_list_create
+(const struct sieve_runtime_env *renv,
+	struct sieve_stringlist *field_names,
+	struct sieve_message_part_iter *part_iter,
+	bool mime_decode, bool children);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-objects.c b/pigeonhole/src/lib-sieve/sieve-objects.c
new file mode 100644
index 0000000..66fc969
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-objects.c
@@ -0,0 +1,111 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-extensions.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+#include "sieve-dump.h"
+#include "sieve-interpreter.h"
+
+#include "sieve-objects.h"
+
+/*
+ * Object coding
+ */
+
+void sieve_opr_object_emit
+(struct sieve_binary_block *sblock, const struct sieve_extension *ext,
+	const struct sieve_object_def *obj_def)
+{
+	struct sieve_extension_objects *objs =
+		(struct sieve_extension_objects *) obj_def->operand->interface;
+
+	(void) sieve_operand_emit(sblock, ext, obj_def->operand);
+
+	if ( objs->count > 1 ) {
+		(void) sieve_binary_emit_byte(sblock, obj_def->code);
+	}
+}
+
+bool sieve_opr_object_read_data
+(struct sieve_binary_block *sblock, const struct sieve_operand *operand,
+	const struct sieve_operand_class *opclass, sieve_size_t *address,
+	struct sieve_object *obj)
+{
+	const struct sieve_extension_objects *objs;
+	unsigned int obj_code;
+
+	if ( operand == NULL || operand->def->class != opclass )
+		return FALSE;
+
+	objs = (struct sieve_extension_objects *) operand->def->interface;
+	if ( objs == NULL )
+		return FALSE;
+
+	if ( objs->count > 1 ) {
+		if ( !sieve_binary_read_byte(sblock, address, &obj_code) )
+			return FALSE;
+
+		if ( obj_code < objs->count ) {
+			const struct sieve_object_def *const *objects =
+				(const struct sieve_object_def *const *) objs->objects;
+
+			obj->def = objects[obj_code];
+			obj->ext = operand->ext;
+			return TRUE;
+		}
+	}
+
+	obj->def = (const struct sieve_object_def *) objs->objects;
+	obj->ext = operand->ext;
+	return TRUE;
+}
+
+bool sieve_opr_object_read
+(const struct sieve_runtime_env *renv,
+	const struct sieve_operand_class *opclass, sieve_size_t *address,
+	struct sieve_object *obj)
+{
+	struct sieve_operand operand;
+
+	if ( !sieve_operand_read(renv->sblock, address, NULL, &operand) ) {
+		return FALSE;
+	}
+
+	return sieve_opr_object_read_data
+		(renv->sblock, &operand, opclass, address, obj);
+}
+
+bool sieve_opr_object_dump
+(const struct sieve_dumptime_env *denv,
+	const struct sieve_operand_class *opclass, sieve_size_t *address,
+	struct sieve_object *obj)
+{
+	struct sieve_operand operand;
+	struct sieve_object obj_i;
+	const char *class;
+
+	if ( obj == NULL )
+		obj = &obj_i;
+
+	sieve_code_mark(denv);
+
+	if ( !sieve_operand_read(denv->sblock, address, NULL, &operand) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_opr_object_read_data
+		(denv->sblock, &operand, opclass, address, obj) )
+		return FALSE;
+
+	if ( operand.def->class == NULL )
+		class = "OBJECT";
+	else
+		class = operand.def->class->name;
+
+	sieve_code_dumpf(denv, "%s: %s", class, obj->def->identifier);
+
+	return TRUE;
+}
+
diff --git a/pigeonhole/src/lib-sieve/sieve-objects.h b/pigeonhole/src/lib-sieve/sieve-objects.h
new file mode 100644
index 0000000..e3f300f
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-objects.h
@@ -0,0 +1,67 @@
+#ifndef SIEVE_OBJECTS_H
+#define SIEVE_OBJECTS_H
+
+/*
+ * Object definition
+ */
+
+struct sieve_object_def {
+	const char *identifier;
+	const struct sieve_operand_def *operand;
+	unsigned int code;
+};
+
+#define SIEVE_OBJECT(_identifier, _operand, _code) \
+	.obj_def = { \
+		.identifier = (_identifier), \
+		.operand = (_operand), \
+		.code = (_code) \
+	}
+
+/*
+ * Object instance
+ */
+
+struct sieve_object {
+	const struct sieve_object_def *def;
+	const struct sieve_extension *ext;
+};
+
+#define SIEVE_OBJECT_DEFAULT(_obj) \
+	{ &((_obj).obj_def), NULL }
+
+#define SIEVE_OBJECT_EXTENSION(_obj) \
+	(_obj->object.ext)
+
+#define SIEVE_OBJECT_SET_DEF(_obj, def_value) \
+	STMT_START { \
+			(_obj)->def = def_value;	\
+			(_obj)->object.def = &(_obj)->def->obj_def; \
+	} STMT_END
+
+
+/*
+ * Object coding
+ */
+
+void sieve_opr_object_emit
+	(struct sieve_binary_block *sblock, const struct sieve_extension *ext,
+		const struct sieve_object_def *obj_def);
+
+bool sieve_opr_object_read_data
+	(struct sieve_binary_block *sblock, const struct sieve_operand *operand,
+		const struct sieve_operand_class *opclass, sieve_size_t *address,
+		struct sieve_object *obj);
+
+bool sieve_opr_object_read
+	(const struct sieve_runtime_env *renv,
+		const struct sieve_operand_class *opclass, sieve_size_t *address,
+		struct sieve_object *obj);
+
+bool sieve_opr_object_dump
+	(const struct sieve_dumptime_env *denv,
+		const struct sieve_operand_class *opclass, sieve_size_t *address,
+		struct sieve_object *obj);
+
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-parser.c b/pigeonhole/src/lib-sieve/sieve-parser.c
new file mode 100644
index 0000000..ee54994
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-parser.c
@@ -0,0 +1,670 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "istream.h"
+#include "failures.h"
+
+#include "sieve-common.h"
+#include "sieve-limits.h"
+#include "sieve-script.h"
+#include "sieve-lexer.h"
+#include "sieve-parser.h"
+#include "sieve-error.h"
+#include "sieve-ast.h"
+
+/*
+ * Forward declarations
+ */
+
+static int
+sieve_parser_recover(struct sieve_parser *parser,
+		     enum sieve_token_type end_token);
+
+/*
+ * Parser object
+ */
+
+struct sieve_parser {
+	pool_t pool;
+
+	bool valid;
+
+	struct sieve_script *script;
+
+	struct sieve_error_handler *ehandler;
+
+	const struct sieve_lexer *lexer;
+	struct sieve_ast *ast;
+};
+
+struct sieve_parser *
+sieve_parser_create(struct sieve_script *script,
+		    struct sieve_error_handler *ehandler,
+		    enum sieve_error *error_r)
+{
+	struct sieve_parser *parser;
+	const struct sieve_lexer *lexer;
+
+	lexer = sieve_lexer_create(script, ehandler, error_r);
+	if (lexer != NULL) {
+		pool_t pool = pool_alloconly_create("sieve_parser", 4096);
+
+		parser = p_new(pool, struct sieve_parser, 1);
+		parser->pool = pool;
+		parser->valid = TRUE;
+
+		parser->ehandler = ehandler;
+		sieve_error_handler_ref(ehandler);
+
+		parser->script = script;
+		sieve_script_ref(script);
+
+		parser->lexer = lexer;
+		parser->ast = NULL;
+
+		return parser;
+	}
+
+	return NULL;
+}
+
+void sieve_parser_free(struct sieve_parser **parser)
+{
+	if ((*parser)->ast != NULL)
+		sieve_ast_unref(&(*parser)->ast);
+
+	sieve_lexer_free(&(*parser)->lexer);
+	sieve_script_unref(&(*parser)->script);
+
+	sieve_error_handler_unref(&(*parser)->ehandler);
+
+	pool_unref(&(*parser)->pool);
+
+	*parser = NULL;
+}
+
+/*
+ * Internal error handling
+ */
+
+inline static void ATTR_FORMAT(4, 5)
+sieve_parser_error(struct sieve_parser *parser,
+		   const char *csrc_filename, unsigned int csrc_linenum,
+		   const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_ERROR,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+	};
+	va_list args;
+
+	va_start(args, fmt);
+
+	/* Don't report a parse error if the lexer complained already */
+	if (sieve_lexer_token_type(parser->lexer) != STT_ERROR) {
+		T_BEGIN {
+			params.location = sieve_error_script_location(
+				parser->script,
+				sieve_lexer_token_line(parser->lexer));
+			sieve_logv(parser->ehandler, &params, fmt, args);
+		} T_END;
+	}
+
+	parser->valid = FALSE;
+
+	va_end(args);
+}
+#define sieve_parser_error(parser, ...) \
+	sieve_parser_error(parser, __FILE__, __LINE__, __VA_ARGS__)
+
+/*
+ * Sieve grammar parsing
+ */
+
+/* sieve_parse_arguments():
+
+   Parses both command arguments and sub-tests:
+     arguments = *argument [test / test-list]
+     argument = string-list / number / tag
+     string = quoted-string / multi-line   [[implicitly handled in lexer]]
+     string-list = "[" string *("," string) "]" / string         ;; if
+       there is only a single string, the brackets are optional
+     test-list = "(" test *("," test) ")"
+     test = identifier arguments
+ */
+static int
+sieve_parse_arguments(struct sieve_parser *parser, struct sieve_ast_node *node,
+		      unsigned int depth)
+{
+	const struct sieve_lexer *lexer = parser->lexer;
+	struct sieve_ast_node *test = NULL;
+	bool test_present = TRUE;
+	bool arg_present = TRUE;
+	int result = 1; /* Indicates whether the parser is in a defined, not
+	                    necessarily error-free state */
+
+	/* Parse arguments */
+	while (arg_present && result > 0) {
+		struct sieve_ast_argument *arg;
+
+		if (!parser->valid &&
+		    !sieve_errors_more_allowed(parser->ehandler)) {
+			result = 0;
+			break;
+		}
+
+		switch (sieve_lexer_token_type(lexer)) {
+		/* String list */
+		case STT_LSQUARE:
+			/* Create stinglist object */
+			arg = sieve_ast_argument_stringlist_create(
+				node, sieve_lexer_token_line(parser->lexer));
+			if (arg == NULL) break;
+			sieve_lexer_skip_token(lexer);
+
+			if (sieve_lexer_token_type(lexer) == STT_STRING) {
+				bool add_failed = FALSE;
+
+				/* Add the string to the list */
+				if (!sieve_ast_stringlist_add(
+					arg, sieve_lexer_token_str(lexer),
+					sieve_lexer_token_line(parser->lexer)))
+					add_failed = TRUE;
+				sieve_lexer_skip_token(lexer);
+
+				while (!add_failed &&
+				       sieve_lexer_token_type(lexer) == STT_COMMA) {
+					sieve_lexer_skip_token(lexer);
+
+					/* Check parser status */
+					if (!parser->valid &&
+					    !sieve_errors_more_allowed(parser->ehandler)) {
+						result = sieve_parser_recover(parser, STT_RSQUARE);
+						break;
+					}
+
+					if (sieve_lexer_token_type(lexer) == STT_STRING) {
+						/* Add the string to the list */
+						if (!sieve_ast_stringlist_add(
+							arg, sieve_lexer_token_str(lexer),
+							sieve_lexer_token_line(parser->lexer)))
+							add_failed = TRUE;
+
+						sieve_lexer_skip_token(lexer);
+					} else {
+						sieve_parser_error(parser,
+							"expecting string after ',' in string list, "
+							"but found %s",
+							sieve_lexer_token_description(lexer));
+						result = sieve_parser_recover(parser, STT_RSQUARE);
+						break;
+					}
+				}
+
+				if (add_failed) {
+					sieve_parser_error(parser,
+						"failed to accept more items in string list");
+					return -1;
+				}
+			} else {
+				sieve_parser_error(parser,
+					"expecting string after '[' in string list, "
+					"but found %s",
+					sieve_lexer_token_description(lexer));
+				result = sieve_parser_recover(parser, STT_RSQUARE);
+			}
+
+			/* Finish the string list */
+			if (sieve_lexer_token_type(lexer) == STT_RSQUARE) {
+				sieve_lexer_skip_token(lexer);
+			} else {
+				sieve_parser_error(parser,
+					"expecting ',' or end of string list ']', "
+					"but found %s",
+					sieve_lexer_token_description(lexer));
+
+				if ((result = sieve_parser_recover(parser, STT_RSQUARE)) > 0)
+					sieve_lexer_skip_token(lexer);
+			}
+			break;
+		/* Single string */
+		case STT_STRING:
+			arg = sieve_ast_argument_string_create(
+				node, sieve_lexer_token_str(lexer),
+				sieve_lexer_token_line(parser->lexer));
+			sieve_lexer_skip_token(lexer);
+			break;
+		/* Number */
+		case STT_NUMBER:
+			arg = sieve_ast_argument_number_create(
+				node, sieve_lexer_token_int(lexer),
+				sieve_lexer_token_line(parser->lexer));
+			sieve_lexer_skip_token(lexer);
+			break;
+		/* Tag */
+		case STT_TAG:
+			arg = sieve_ast_argument_tag_create(
+				node, sieve_lexer_token_ident(lexer),
+				sieve_lexer_token_line(parser->lexer));
+			sieve_lexer_skip_token(lexer);
+			break;
+		/* End of argument list, continue with tests */
+		default:
+			arg_present = FALSE;
+			break;
+		}
+
+		if (arg_present && arg == NULL) {
+			sieve_parser_error(parser,
+				"failed to accept more arguments for command '%s'",
+				node->identifier);
+			return -1;
+		}
+
+		if (sieve_ast_argument_count(node) > SIEVE_MAX_COMMAND_ARGUMENTS) {
+			sieve_parser_error(parser,
+				"too many arguments for command '%s'",
+				node->identifier);
+			return 0;
+		}
+	}
+
+	if (result <= 0)
+		return result; /* Defer recovery to caller */
+
+	/* --> [ test / test-list ]
+ 	   test-list = "(" test *("," test) ")"
+	   test = identifier arguments
+	 */
+	switch (sieve_lexer_token_type(lexer)) {
+	/* Single test */
+	case STT_IDENTIFIER:
+		if ((depth + 1) > SIEVE_MAX_TEST_NESTING) {
+			sieve_parser_error(parser,
+				"cannot nest tests deeper than %u levels",
+				SIEVE_MAX_TEST_NESTING);
+			return 0;
+		}
+
+		test = sieve_ast_test_create(
+			node, sieve_lexer_token_ident(lexer),
+			sieve_lexer_token_line(parser->lexer));
+		sieve_lexer_skip_token(lexer);
+
+		/* Theoretically, test can be NULL */
+		if (test == NULL)
+			break;
+
+		/* Parse test arguments, which may include more tests (recurse) */
+		if (sieve_parse_arguments(parser, test, depth + 1) <= 0) {
+			return 0; /* Defer recovery to caller */
+		}
+
+		break;
+
+	/* Test list */
+	case STT_LBRACKET:
+		sieve_lexer_skip_token(lexer);
+
+		if (depth+1 > SIEVE_MAX_TEST_NESTING) {
+			sieve_parser_error(parser,
+				"cannot nest tests deeper than %u levels",
+				SIEVE_MAX_TEST_NESTING);
+			result = sieve_parser_recover(parser, STT_RBRACKET);
+
+			if (result > 0)
+				sieve_lexer_skip_token(lexer);
+			return result;
+		}
+
+		node->test_list = TRUE;
+
+		/* Test starts with identifier */
+		if (sieve_lexer_token_type(lexer) == STT_IDENTIFIER) {
+			test = sieve_ast_test_create(
+				node, sieve_lexer_token_ident(lexer),
+				sieve_lexer_token_line(parser->lexer));
+			sieve_lexer_skip_token(lexer);
+
+			if (test == NULL)
+				break;
+
+			/* Parse test arguments, which may include more tests (recurse) */
+			if ((result = sieve_parse_arguments(parser, test, depth+1)) > 0) {
+
+				/* More tests ? */
+				while (sieve_lexer_token_type(lexer) == STT_COMMA) {
+					sieve_lexer_skip_token(lexer);
+
+					/* Check parser status */
+					if (!parser->valid &&
+					    !sieve_errors_more_allowed(parser->ehandler)) {
+						result = sieve_parser_recover(parser, STT_RBRACKET);
+						break;
+					}
+
+					/* Test starts with identifier */
+					if (sieve_lexer_token_type(lexer) == STT_IDENTIFIER) {
+						test = sieve_ast_test_create(
+							node, sieve_lexer_token_ident(lexer),
+							sieve_lexer_token_line(parser->lexer));
+						sieve_lexer_skip_token(lexer);
+
+						if (test == NULL)
+							break;
+
+						/* Parse test arguments, which may include more tests (recurse) */
+						if ((result = sieve_parse_arguments(parser, test, depth+1)) <= 0) {
+							if (result < 0)
+								return result;
+							result = sieve_parser_recover(parser, STT_RBRACKET);
+							break;
+						}
+					} else {
+						sieve_parser_error(parser,
+							"expecting test identifier after ',' in test list, "
+							"but found %s",
+							sieve_lexer_token_description(lexer));
+						result = sieve_parser_recover(parser, STT_RBRACKET);
+						break;
+					}
+				}
+				if (test == NULL)
+					break;
+			} else {
+				if (result < 0)
+					return result;
+
+				result = sieve_parser_recover(parser, STT_RBRACKET);
+			}
+		} else {
+			sieve_parser_error(parser,
+				"expecting test identifier after '(' in test list, "
+				"but found %s",
+				sieve_lexer_token_description(lexer));
+
+			result = sieve_parser_recover(parser, STT_RBRACKET);
+		}
+
+		/* The next token should be a ')', indicating the end of the
+		   test list
+		     --> previous sieve_parser_recover calls try to restore this
+			 situation after parse errors.
+		 */
+ 		if (sieve_lexer_token_type(lexer) == STT_RBRACKET) {
+			sieve_lexer_skip_token(lexer);
+		} else {
+			sieve_parser_error(parser,
+				"expecting ',' or end of test list ')', "
+				"but found %s",
+				sieve_lexer_token_description(lexer));
+
+			/* Recover function tries to make next token equal to
+			   ')'. If it succeeds we need to skip it.
+			 */
+			if ((result = sieve_parser_recover(parser, STT_RBRACKET)) > 0)
+				sieve_lexer_skip_token(lexer);
+		}
+		break;
+
+	default:
+		/* Not an error: test / test-list is optional
+		     --> any errors are detected by the caller
+		 */
+		test_present = FALSE;
+		break;
+	}
+
+	if (test_present && test == NULL) {
+		sieve_parser_error(parser,
+			"failed to accept more tests for command '%s'",
+			node->identifier);
+		return -1;
+	}
+
+	return result;
+}
+
+/* commands = *command
+   command = identifier arguments ( ";" / block )
+   block = "{" commands "}"
+ */
+static int
+sieve_parse_commands(struct sieve_parser *parser, struct sieve_ast_node *block,
+		     unsigned int depth)
+{
+	const struct sieve_lexer *lexer = parser->lexer;
+	int result = 1;
+
+	while (result > 0 &&
+	       sieve_lexer_token_type(lexer) == STT_IDENTIFIER) {
+		struct sieve_ast_node *command;
+
+		/* Check parser status */
+		if (!parser->valid &&
+		    !sieve_errors_more_allowed(parser->ehandler)) {
+			result = sieve_parser_recover(parser, STT_SEMICOLON);
+			break;
+		}
+
+		/* Create command node */
+		command = sieve_ast_command_create(
+			block, sieve_lexer_token_ident(lexer),
+			sieve_lexer_token_line(parser->lexer));
+		sieve_lexer_skip_token(lexer);
+
+		if (command == NULL) {
+			sieve_parser_error(parser,
+				"failed to accept more commands inside the block of command '%s'",
+				block->identifier);
+			return -1;
+		}
+
+		result = sieve_parse_arguments(parser, command, 1);
+
+		/* Check whether the command is properly terminated
+		   (i.e. with ; or a new block)
+		 */
+		if (result > 0 &&
+		    sieve_lexer_token_type(lexer) != STT_SEMICOLON &&
+		    sieve_lexer_token_type(lexer) != STT_LCURLY) {
+
+			sieve_parser_error(parser,
+				"expected end of command ';' or the beginning of a compound block '{', "
+				"but found %s",
+				sieve_lexer_token_description(lexer));
+			result = 0;
+		}
+
+		/* Try to recover from parse errors to reacquire a defined state
+		 */
+		if (result == 0)
+			result = sieve_parser_recover(parser, STT_SEMICOLON);
+
+		/* Don't bother to continue if we are not in a defined state */
+		if (result <= 0)
+			return result;
+
+		switch (sieve_lexer_token_type(lexer)) {
+		/* End of the command */
+		case STT_SEMICOLON:
+			sieve_lexer_skip_token(lexer);
+			break;
+		/* Command has a block {...} */
+		case STT_LCURLY:
+			sieve_lexer_skip_token(lexer);
+
+			/* Check current depth first */
+			if ((depth + 1) > SIEVE_MAX_BLOCK_NESTING) {
+				sieve_parser_error(parser,
+					"cannot nest command blocks deeper than %u levels",
+					SIEVE_MAX_BLOCK_NESTING);
+				result = sieve_parser_recover(parser, STT_RCURLY);
+
+				if (result > 0)
+					sieve_lexer_skip_token(lexer);
+				break;
+			}
+
+			command->block = TRUE;
+
+			if ((result = sieve_parse_commands(parser, command, depth + 1)) > 0) {
+				if (sieve_lexer_token_type(lexer) != STT_RCURLY) {
+					sieve_parser_error(parser,
+						"expected end of compound block '}', "
+						"but found %s",
+						sieve_lexer_token_description(lexer));
+					result = sieve_parser_recover(parser, STT_RCURLY);
+				} else {
+					sieve_lexer_skip_token(lexer);
+				}
+			} else {
+				if (result < 0)
+					return result;
+
+				if ((result = sieve_parser_recover(parser, STT_RCURLY)) > 0)
+					sieve_lexer_skip_token(lexer);
+			}
+
+			break;
+
+		default:
+			/* Recovered previously, so this cannot happen */
+			i_unreached();
+		}
+	}
+
+	return result;
+}
+
+bool sieve_parser_run(struct sieve_parser *parser, struct sieve_ast **ast)
+{
+	if (parser->ast != NULL)
+		sieve_ast_unref(&parser->ast);
+
+	/* Create AST object if none is provided */
+	if (*ast == NULL)
+		*ast = sieve_ast_create(parser->script);
+	else
+		sieve_ast_ref(*ast);
+
+	parser->ast = *ast;
+
+	/* Scan first token */
+	sieve_lexer_skip_token(parser->lexer);
+
+	/* Parse */
+	if (sieve_parse_commands(parser, sieve_ast_root(parser->ast), 1) > 0 &&
+	    parser->valid) {
+		/* Parsed right to EOF ? */
+		if (sieve_lexer_token_type(parser->lexer) != STT_EOF) {
+			sieve_parser_error(parser,
+				"unexpected %s found at (the presumed) end of file",
+				sieve_lexer_token_description(parser->lexer));
+			parser->valid = FALSE;
+		}
+	} else {
+		parser->valid = FALSE;
+	}
+
+	/* Clean up AST if parse failed */
+	if (!parser->valid) {
+		parser->ast = NULL;
+		sieve_ast_unref(ast);
+	}
+
+	return parser->valid;
+}
+
+/* Error recovery:
+     To continue parsing after an error it is important to find the next
+     parsible item in the stream. The recover function skips over the remaining
+     garbage after an error. It tries  to find the end of the failed syntax
+     structure and takes nesting of structures into account.
+ */
+
+/* Assign useful names to priorities for readability */
+enum sieve_grammatical_prio {
+	SGP_BLOCK = 3,
+	SGP_COMMAND = 2,
+	SGP_TEST_LIST = 1,
+	SGP_STRING_LIST = 0,
+
+	SGP_OTHER = -1
+};
+
+static inline enum sieve_grammatical_prio
+__get_token_priority(enum sieve_token_type token)
+{
+	switch (token) {
+	case STT_LCURLY:
+	case STT_RCURLY:
+		return SGP_BLOCK;
+	case STT_SEMICOLON:
+		return SGP_COMMAND;
+	case STT_LBRACKET:
+	case STT_RBRACKET:
+		return SGP_TEST_LIST;
+	case STT_LSQUARE:
+	case STT_RSQUARE:
+		return SGP_STRING_LIST;
+	default:
+		break;
+	}
+
+	return SGP_OTHER;
+}
+
+static int
+sieve_parser_recover(struct sieve_parser *parser,
+		     enum sieve_token_type end_token)
+{
+	/* The tokens that begin/end a specific block/command/list in order
+ 	   of ascending grammatical priority.
+ 	 */
+ 	static const enum sieve_token_type begin_tokens[4] = {
+		STT_LSQUARE, STT_LBRACKET, STT_NONE, STT_LCURLY };
+	static const enum sieve_token_type end_tokens[4] = {
+		STT_RSQUARE, STT_RBRACKET, STT_SEMICOLON, STT_RCURLY};
+	const struct sieve_lexer *lexer = parser->lexer;
+	int nesting = 1;
+	enum sieve_grammatical_prio end_priority =
+		__get_token_priority(end_token);
+
+	i_assert(end_priority != SGP_OTHER);
+
+	while (sieve_lexer_token_type(lexer) != STT_EOF &&
+	       __get_token_priority(sieve_lexer_token_type(lexer))
+		<= end_priority) {
+		if (sieve_lexer_token_type(lexer) ==
+			begin_tokens[end_priority]) {
+			nesting++;
+			sieve_lexer_skip_token(lexer);
+			continue;
+		}
+		if (sieve_lexer_token_type(lexer) ==
+			end_tokens[end_priority]) {
+			nesting--;
+
+			if (nesting == 0) {
+				/* Next character is the end */
+				return 1;
+			}
+		}
+		sieve_lexer_skip_token(lexer);
+	}
+
+	/* Special case: COMMAND */
+	if (end_token == STT_SEMICOLON &&
+	    sieve_lexer_token_type(lexer) == STT_LCURLY) {
+		return 1;
+	}
+
+	/* End not found before eof or end of surrounding grammatical structure
+	 */
+	return 0;
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-parser.h b/pigeonhole/src/lib-sieve/sieve-parser.h
new file mode 100644
index 0000000..dfcb63c
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-parser.h
@@ -0,0 +1,17 @@
+#ifndef SIEVE_PARSER_H
+#define SIEVE_PARSER_H
+
+#include "lib.h"
+
+#include "sieve-common.h"
+
+struct sieve_parser;
+
+struct sieve_parser *
+sieve_parser_create(struct sieve_script *script,
+		    struct sieve_error_handler *ehandler,
+		    enum sieve_error *error_r);
+void sieve_parser_free(struct sieve_parser **parser);
+bool sieve_parser_run(struct sieve_parser *parser, struct sieve_ast **ast);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-plugins.c b/pigeonhole/src/lib-sieve/sieve-plugins.c
new file mode 100644
index 0000000..c0f32b1
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-plugins.c
@@ -0,0 +1,181 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "module-dir.h"
+
+#include "sieve-settings.h"
+#include "sieve-extensions.h"
+
+#include "sieve-common.h"
+#include "sieve-plugins.h"
+
+/*
+ * Types
+ */
+
+typedef void (*sieve_plugin_load_func_t)
+	(struct sieve_instance *svinst, void **context);
+typedef void (*sieve_plugin_unload_func_t)
+	(struct sieve_instance *svinst, void *context);
+
+struct sieve_plugin {
+	struct module *module;
+
+	void *context;
+
+	struct sieve_plugin *next;
+};
+
+/*
+ * Plugin support
+ */
+
+static struct module *sieve_modules = NULL;
+static int sieve_modules_refcount = 0;
+
+static struct module *sieve_plugin_module_find(const char *name)
+{
+	struct module *module;
+
+	module = sieve_modules;
+	while ( module != NULL ) {
+		const char *mod_name;
+
+		/* Strip module names */
+		mod_name = module_get_plugin_name(module);
+
+		if ( strcmp(mod_name, name) == 0 )
+			return module;
+
+		module = module->next;
+	}
+
+	return NULL;
+}
+
+void sieve_plugins_load
+(struct sieve_instance *svinst, const char *path, const char *plugins)
+{
+	struct module *module;
+	struct module_dir_load_settings mod_set;
+	const char **module_names;
+	unsigned int i;
+
+	/* Determine what to load */
+
+	if ( path == NULL && plugins == NULL ) {
+		path = sieve_setting_get(svinst, "sieve_plugin_dir");
+		plugins = sieve_setting_get(svinst, "sieve_plugins");
+	}
+
+	if ( plugins == NULL || *plugins == '\0' )
+		return;
+
+	if ( path == NULL || *path == '\0' )
+		path = MODULEDIR"/sieve";
+
+	i_zero(&mod_set);
+	mod_set.abi_version = PIGEONHOLE_ABI_VERSION;
+	mod_set.require_init_funcs = TRUE;
+	mod_set.debug = FALSE;
+
+	/* Load missing plugin modules */
+
+	sieve_modules = module_dir_load_missing
+		(sieve_modules, path, plugins, &mod_set);
+
+	/* Call plugin load functions for this Sieve instance */
+
+	if ( svinst->plugins == NULL ) {
+		sieve_modules_refcount++;
+	}
+
+	module_names = t_strsplit_spaces(plugins, ", ");
+
+	for (i = 0; module_names[i] != NULL; i++) {
+		/* Allow giving the module names also in non-base form. */
+		module_names[i] = module_file_get_name(module_names[i]);
+	}
+
+ 	for (i = 0; module_names[i] != NULL; i++) {
+		struct sieve_plugin *plugin;
+		const char *name = module_names[i];
+		sieve_plugin_load_func_t load_func;
+
+		/* Find the module */
+		module = sieve_plugin_module_find(name);
+		i_assert(module != NULL);
+
+		/* Check whether the plugin is already loaded in this instance */
+		plugin = svinst->plugins;
+		while ( plugin != NULL ) {
+			if ( plugin->module == module )
+				break;
+			plugin = plugin->next;
+		}
+
+		/* Skip it if it is loaded already */
+		if ( plugin != NULL )
+			continue;
+
+		/* Create plugin list item */
+		plugin = p_new(svinst->pool, struct sieve_plugin, 1);
+		plugin->module = module;
+
+		/* Call load function */
+		load_func = (sieve_plugin_load_func_t) module_get_symbol
+			(module, t_strdup_printf("%s_load", module->name));
+		if ( load_func != NULL ) {
+			load_func(svinst, &plugin->context);
+		}
+
+		/* Add plugin to the instance */
+		if ( svinst->plugins == NULL )
+			svinst->plugins = plugin;
+		else {
+			struct sieve_plugin *plugin_last;
+
+			plugin_last = svinst->plugins;
+			while ( plugin_last->next != NULL )
+				plugin_last = plugin_last->next;
+
+			plugin_last->next = plugin;
+		}
+	}
+}
+
+void sieve_plugins_unload(struct sieve_instance *svinst)
+{
+	struct sieve_plugin *plugin;
+
+	if ( svinst->plugins == NULL )
+		return;
+
+	/* Call plugin unload functions for this instance */
+
+	plugin = svinst->plugins;
+	while ( plugin != NULL ) {
+		struct module *module = plugin->module;
+		sieve_plugin_unload_func_t unload_func;
+
+		unload_func = (sieve_plugin_unload_func_t)module_get_symbol
+			(module, t_strdup_printf("%s_unload", module->name));
+		if ( unload_func != NULL ) {
+			unload_func(svinst, plugin->context);
+		}
+
+		plugin = plugin->next;
+	}
+
+	/* Physically unload modules */
+
+	i_assert(sieve_modules_refcount > 0);
+
+	if ( --sieve_modules_refcount != 0 )
+		return;
+
+	module_dir_unload(&sieve_modules);
+}
+
diff --git a/pigeonhole/src/lib-sieve/sieve-plugins.h b/pigeonhole/src/lib-sieve/sieve-plugins.h
new file mode 100644
index 0000000..996af41
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-plugins.h
@@ -0,0 +1,9 @@
+#ifndef SIEVE_PLUGINS_H
+#define SIEVE_PLUGINS_H
+
+#include "sieve-common.h"
+
+void sieve_plugins_load(struct sieve_instance *svinst, const char *path, const char *plugins);
+void sieve_plugins_unload(struct sieve_instance *svinst);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-result.c b/pigeonhole/src/lib-sieve/sieve-result.c
new file mode 100644
index 0000000..89d249e
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-result.c
@@ -0,0 +1,2445 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "mempool.h"
+#include "ostream.h"
+#include "hash.h"
+#include "str.h"
+#include "llist.h"
+#include "strfuncs.h"
+#include "str-sanitize.h"
+#include "var-expand.h"
+#include "message-address.h"
+#include "mail-storage.h"
+
+#include "sieve-common.h"
+#include "sieve-limits.h"
+#include "sieve-script.h"
+#include "sieve-error.h"
+#include "sieve-interpreter.h"
+#include "sieve-actions.h"
+#include "sieve-message.h"
+
+#include "sieve-result.h"
+
+#include <stdio.h>
+
+struct event_category event_category_sieve_action = {
+	.parent = &event_category_sieve,
+	.name = "sieve-action",
+};
+
+/*
+ * Types
+ */
+
+enum sieve_action_execution_state {
+	SIEVE_ACTION_EXECUTION_STATE_INIT = 0,
+	SIEVE_ACTION_EXECUTION_STATE_STARTED,
+	SIEVE_ACTION_EXECUTION_STATE_EXECUTED,
+	SIEVE_ACTION_EXECUTION_STATE_FINALIZED,
+};
+
+struct sieve_result_action {
+	struct sieve_action action;
+
+	struct sieve_side_effects_list *seffects;
+
+	struct sieve_result_action *prev, *next;
+};
+
+struct sieve_side_effects_list {
+	struct sieve_result *result;
+
+	struct sieve_result_side_effect *first_effect;
+	struct sieve_result_side_effect *last_effect;
+};
+
+struct sieve_result_side_effect {
+	struct sieve_side_effect seffect;
+
+	struct sieve_result_side_effect *prev, *next;
+};
+
+struct sieve_result_action_context {
+	const struct sieve_action_def *action;
+	struct sieve_side_effects_list *seffects;
+};
+
+/*
+ * Result object
+ */
+
+struct sieve_result {
+	pool_t pool;
+	int refcount;
+
+	struct sieve_instance *svinst;
+	struct event *event;
+
+	/* Context data for extensions */
+	ARRAY(void *) ext_contexts;
+
+	const struct sieve_execute_env *exec_env;
+	struct sieve_error_handler *ehandler;
+	struct sieve_message_context *msgctx;
+
+	unsigned int exec_seq;
+	struct sieve_result_execution *exec;
+
+	struct sieve_action keep_action;
+	struct sieve_action failure_action;
+
+	unsigned int action_count;
+	struct sieve_result_action *actions_head, *actions_tail;
+
+	HASH_TABLE(const struct sieve_action_def *,
+		   struct sieve_result_action_context *) action_contexts;
+};
+
+static const char *
+sieve_result_event_log_message(struct sieve_result *result,
+			       enum log_type log_type, const char *message)
+{
+	const struct sieve_script_env *senv = result->exec_env->scriptenv;
+
+	i_assert(senv->result_amend_log_message != NULL);
+	return senv->result_amend_log_message(senv, log_type, message);
+}
+
+struct sieve_result *
+sieve_result_create(struct sieve_instance *svinst, pool_t pool,
+		    const struct sieve_execute_env *eenv)
+{
+	const struct sieve_script_env *senv = eenv->scriptenv;
+	const struct sieve_message_data *msgdata = eenv->msgdata;
+	struct sieve_result *result;
+
+	pool_ref(pool);
+
+	result = p_new(pool, struct sieve_result, 1);
+	result->refcount = 1;
+	result->pool = pool;
+	result->svinst = svinst;
+
+	result->event = event_create(eenv->event);
+	event_add_category(result->event, &event_category_sieve_action);
+	if (senv->result_amend_log_message != NULL) {
+		event_set_log_message_callback(
+			result->event, sieve_result_event_log_message, result);
+	}
+
+	p_array_init(&result->ext_contexts, pool, 4);
+
+	result->exec_env = eenv;
+	result->msgctx =
+		sieve_message_context_create(svinst, senv->user, msgdata);
+
+	result->keep_action.def = &act_store;
+	result->keep_action.ext = NULL;
+	result->failure_action.def = &act_store;
+	result->failure_action.ext = NULL;
+
+	result->action_count = 0;
+	result->actions_head = NULL;
+	result->actions_tail = NULL;
+
+	return result;
+}
+
+void sieve_result_ref(struct sieve_result *result)
+{
+	result->refcount++;
+}
+
+static void
+sieve_result_action_deinit(struct sieve_result_action *ract)
+{
+	event_unref(&ract->action.event);
+}
+
+void sieve_result_unref(struct sieve_result **_result)
+{
+	struct sieve_result *result = *_result;
+	struct sieve_result_action *ract;
+
+	i_assert(result->refcount > 0);
+
+	if (--result->refcount != 0)
+		return;
+
+	sieve_message_context_unref(&result->msgctx);
+
+	hash_table_destroy(&result->action_contexts);
+
+	ract = result->actions_head;
+	while (ract != NULL) {
+		sieve_result_action_deinit(ract);
+		ract = ract->next;
+	}
+	event_unref(&result->event);
+
+	pool_unref(&result->pool);
+	*_result = NULL;
+}
+
+pool_t sieve_result_pool(struct sieve_result *result)
+{
+	return result->pool;
+}
+
+/*
+ * Getters/Setters
+ */
+
+const struct sieve_script_env *
+sieve_result_get_script_env(struct sieve_result *result)
+{
+	return result->exec_env->scriptenv;
+}
+
+const struct sieve_message_data *
+sieve_result_get_message_data(struct sieve_result *result)
+{
+	return result->exec_env->msgdata;
+}
+
+struct sieve_message_context *
+sieve_result_get_message_context(struct sieve_result *result)
+{
+	return result->msgctx;
+}
+
+unsigned int sieve_result_get_exec_seq(struct sieve_result *result)
+{
+	return result->exec_seq;
+}
+
+/*
+ * Extension support
+ */
+
+void sieve_result_extension_set_context(struct sieve_result *result,
+					const struct sieve_extension *ext,
+					void *context)
+{
+	if (ext->id < 0)
+		return;
+
+	array_idx_set(&result->ext_contexts, (unsigned int) ext->id, &context);
+}
+
+const void *
+sieve_result_extension_get_context(struct sieve_result *result,
+				   const struct sieve_extension *ext)
+{
+	void * const *ctx;
+
+	if (ext->id < 0 || ext->id >= (int) array_count(&result->ext_contexts))
+		return NULL;
+
+	ctx = array_idx(&result->ext_contexts, (unsigned int) ext->id);
+
+	return *ctx;
+}
+
+/*
+ * Result composition
+ */
+
+static void
+sieve_result_init_action_event(struct sieve_result *result,
+			       struct sieve_action *action, bool add_prefix)
+{
+	const char *name = sieve_action_name(action);
+
+	if (action->event != NULL)
+		return;
+
+	action->event = event_create(result->event);
+	if (add_prefix && name != NULL) {
+		event_set_append_log_prefix(
+			action->event, t_strconcat(name, " action: ", NULL));
+	}
+	event_add_str(action->event, "action_name", name);
+	event_add_str(action->event, "script_location", action->location);
+}
+
+void sieve_result_add_implicit_side_effect(
+	struct sieve_result *result, const struct sieve_action_def *to_action,
+	bool to_keep, const struct sieve_extension *ext,
+	const struct sieve_side_effect_def *seff_def, void *context)
+{
+	struct sieve_result_action_context *actctx = NULL;
+	struct sieve_side_effect seffect;
+
+	to_action = to_keep ? &act_store : to_action;
+
+	if (!hash_table_is_created(result->action_contexts)) {
+		hash_table_create_direct(&result->action_contexts,
+					 result->pool, 0);
+	} else {
+		actctx = hash_table_lookup(result->action_contexts, to_action);
+	}
+
+	if (actctx == NULL) {
+		actctx = p_new(result->pool,
+			       struct sieve_result_action_context, 1);
+		actctx->action = to_action;
+		actctx->seffects = sieve_side_effects_list_create(result);
+
+		hash_table_insert(result->action_contexts, to_action, actctx);
+	}
+
+	seffect.object.def = &seff_def->obj_def;
+	seffect.object.ext = ext;
+	seffect.def = seff_def;
+	seffect.context = context;
+
+	sieve_side_effects_list_add(actctx->seffects, &seffect);
+}
+
+static int
+sieve_result_side_effects_merge(const struct sieve_runtime_env *renv,
+				const struct sieve_action *action,
+				struct sieve_result_action *old_action,
+				struct sieve_side_effects_list *new_seffects)
+{
+	struct sieve_side_effects_list *old_seffects = old_action->seffects;
+	int ret;
+	struct sieve_result_side_effect *rsef, *nrsef;
+
+	/* Allow side-effects to merge with existing copy */
+
+	/* Merge existing side effects */
+	rsef = old_seffects != NULL ? old_seffects->first_effect : NULL;
+	while (rsef != NULL) {
+		struct sieve_side_effect *seffect = &rsef->seffect;
+		bool found = FALSE;
+
+		i_assert(seffect->def != NULL);
+		if (seffect->def->merge != NULL) {
+			/* Try to find it among the new */
+			nrsef = (new_seffects != NULL ?
+				 new_seffects->first_effect : NULL);
+			while (nrsef != NULL) {
+				struct sieve_side_effect *nseffect = &nrsef->seffect;
+
+				if (nseffect->def == seffect->def) {
+					if (seffect->def->merge(
+						renv, action, seffect, nseffect,
+						&seffect->context) < 0)
+						return -1;
+
+					found = TRUE;
+					break;
+				}
+				nrsef = nrsef->next;
+			}
+
+			/* Not found? */
+			if (!found && seffect->def->merge(
+				renv, action, seffect, NULL,
+				&rsef->seffect.context) < 0)
+				return -1;
+		}
+		rsef = rsef->next;
+	}
+
+	/* Merge new Side effects */
+	nrsef = new_seffects != NULL ? new_seffects->first_effect : NULL;
+	while (nrsef != NULL) {
+		struct sieve_side_effect *nseffect = &nrsef->seffect;
+		bool found = FALSE;
+
+		i_assert(nseffect->def != NULL);
+		if (nseffect->def->merge != NULL) {
+			/* Try to find it among the exising */
+			rsef = (old_seffects != NULL ?
+				old_seffects->first_effect : NULL);
+			while (rsef != NULL) {
+				if (rsef->seffect.def == nseffect->def) {
+					found = TRUE;
+					break;
+				}
+				rsef = rsef->next;
+			}
+
+			/* Not found? */
+			if (!found) {
+				void *new_context = NULL;
+
+				if ((ret = nseffect->def->merge(
+					renv, action, nseffect, nseffect,
+					&new_context)) < 0)
+					return -1;
+
+				if (ret != 0) {
+					if (old_action->seffects == NULL) {
+						old_action->seffects = old_seffects =
+							sieve_side_effects_list_create(renv->result);
+					}
+
+					nseffect->context = new_context;
+
+					/* Add side effect */
+					sieve_side_effects_list_add(old_seffects,
+								    nseffect);
+				}
+			}
+		}
+		nrsef = nrsef->next;
+	}
+
+	return 1;
+}
+
+static void
+sieve_result_action_detach(struct sieve_result *result,
+			   struct sieve_result_action *raction)
+{
+	if (result->actions_head == raction)
+		result->actions_head = raction->next;
+
+	if (result->actions_tail == raction)
+		result->actions_tail = raction->prev;
+
+	if (raction->next != NULL)
+		raction->next->prev = raction->prev;
+	if (raction->prev != NULL)
+		raction->prev->next = raction->next;
+
+	raction->next = NULL;
+	raction->prev = NULL;
+
+	if (result->action_count > 0)
+		result->action_count--;
+}
+
+static int
+_sieve_result_add_action(const struct sieve_runtime_env *renv,
+			 const struct sieve_extension *ext, const char *name,
+			 const struct sieve_action_def *act_def,
+			 struct sieve_side_effects_list *seffects,
+			 void *context, unsigned int instance_limit,
+			 bool preserve_mail, bool keep)
+{
+	int ret = 0;
+	unsigned int instance_count = 0;
+	struct sieve_instance *svinst = renv->exec_env->svinst;
+	struct sieve_result *result = renv->result;
+	struct sieve_result_action *raction = NULL, *kaction = NULL;
+	struct sieve_action action;
+
+	i_assert(name != NULL || act_def != NULL);
+	action.name = name;
+	action.def = act_def;
+	action.ext = ext;
+	action.location = sieve_runtime_get_full_command_location(renv);
+	action.context = context;
+	action.exec_seq = result->exec_seq;
+
+	/* First, check for duplicates or conflicts */
+	raction = result->actions_head;
+	while (raction != NULL) {
+		const struct sieve_action *oact = &raction->action;
+		bool oact_new = (oact->exec_seq == result->exec_seq);
+
+		if (keep && raction->action.keep) {
+			/* Duplicate keep */
+			if (oact->def == NULL || !oact_new) {
+				/* Keep action from preceeding execution */
+
+				/* Detach existing keep action */
+				sieve_result_action_detach(result, raction);
+
+				/* Merge existing side-effects with new keep action */
+				if (kaction == NULL)
+					kaction = raction;
+
+				if ((ret = sieve_result_side_effects_merge(
+					renv, &action, kaction, seffects)) <= 0)
+					return ret;
+			} else {
+				/* True duplicate */
+				return sieve_result_side_effects_merge(
+					renv, &action, raction, seffects);
+			}
+		} else if ( act_def != NULL && raction->action.def == act_def ) {
+			instance_count++;
+
+			/* Possible duplicate */
+			if (act_def->check_duplicate != NULL) {
+				if ((ret = act_def->check_duplicate(
+					renv, &action, &raction->action)) < 0)
+					return ret;
+
+				/* Duplicate */
+				if (ret == 1) {
+					if (keep && !oact->keep) {
+						/* New keep has higher precedence than
+						   existing duplicate non-keep action.
+						   So, take over the result action object
+						   and transform it into a keep.
+						 */
+						if ((ret = sieve_result_side_effects_merge(
+							renv, &action, raction, seffects)) < 0)
+							return ret;
+
+						if (kaction == NULL) {
+							raction->action.context = NULL;
+							raction->action.location =
+								p_strdup(result->pool, action.location);
+
+							/* Note that existing execution
+							   status is retained, making sure
+							   that keep is not executed
+							   multiple times.
+							 */
+							kaction = raction;
+						} else {
+							sieve_result_action_detach(result, raction);
+
+							if ((ret = sieve_result_side_effects_merge(
+								renv, &action, kaction,
+								raction->seffects)) < 0)
+								return ret;
+						}
+					} else {
+						/* Merge side-effects, but don't add new action
+						 */
+						return sieve_result_side_effects_merge(
+							renv, &action, raction, seffects);
+					}
+				}
+			}
+		} else {
+			if (act_def != NULL && oact->def != NULL) {
+				/* Check conflict */
+				if (act_def->check_conflict != NULL &&
+				    (ret = act_def->check_conflict(
+					renv, &action, &raction->action)) != 0)
+					return ret;
+
+				if (oact_new &&
+				    oact->def->check_conflict != NULL &&
+				    (ret = oact->def->check_conflict(
+					renv, &raction->action, &action)) != 0)
+					return ret;
+			}
+		}
+		raction = raction->next;
+	}
+
+	if (kaction != NULL) {
+		/* Use existing keep action to define new one */
+		raction = kaction;
+	} else {
+		/* Check policy limit on total number of actions */
+		if (svinst->max_actions > 0 &&
+		    result->action_count >= svinst->max_actions)
+		{
+			sieve_runtime_error(
+				renv, action.location,
+				"total number of actions exceeds policy limit "
+				"(%u > %u)",
+				result->action_count+1, svinst->max_actions);
+			return -1;
+		}
+
+		/* Check policy limit on number of this class of actions */
+		if (instance_limit > 0 && instance_count >= instance_limit) {
+			sieve_runtime_error(
+				renv, action.location,
+				"number of %s actions exceeds policy limit "
+				"(%u > %u)",
+				act_def->name, instance_count+1,
+				instance_limit);
+			return -1;
+		}
+
+		/* Create new action object */
+		raction = p_new(result->pool, struct sieve_result_action, 1);
+		raction->seffects = seffects;
+	}
+
+	raction->action.name = (action.name == NULL ?
+				act_def->name :
+				p_strdup(result->pool, action.name));
+	raction->action.context = context;
+	raction->action.def = act_def;
+	raction->action.ext = ext;
+	raction->action.location = p_strdup(result->pool, action.location);
+	raction->action.keep = keep;
+	raction->action.exec_seq = result->exec_seq;
+
+	if (raction->prev == NULL && raction != result->actions_head) {
+		/* Add */
+		if (result->actions_head == NULL) {
+			result->actions_head = raction;
+			result->actions_tail = raction;
+			raction->prev = NULL;
+			raction->next = NULL;
+		} else {
+			result->actions_tail->next = raction;
+			raction->prev = result->actions_tail;
+			result->actions_tail = raction;
+			raction->next = NULL;
+		}
+		result->action_count++;
+
+		/* Apply any implicit side effects */
+		if (hash_table_is_created(result->action_contexts)) {
+			struct sieve_result_action_context *actctx;
+
+			/* Check for implicit side effects to this particular
+			   action */
+			actctx = hash_table_lookup(
+				result->action_contexts,
+				(keep ? &act_store : act_def));
+
+			if (actctx != NULL) {
+				struct sieve_result_side_effect *iseff;
+
+				/* Iterate through all implicit side effects and
+				   add those that are missing.
+				 */
+				iseff = actctx->seffects->first_effect;
+				while (iseff != NULL) {
+					struct sieve_result_side_effect *seff;
+					bool exists = FALSE;
+
+					/* Scan for presence */
+					if (seffects != NULL) {
+						seff = seffects->first_effect;
+						while (seff != NULL) {
+							if (seff->seffect.def == iseff->seffect.def) {
+								exists = TRUE;
+								break;
+							}
+
+							seff = seff->next;
+						}
+					} else {
+						raction->seffects = seffects =
+							sieve_side_effects_list_create(result);
+					}
+
+					/* If not present, add it */
+					if (!exists) {
+						sieve_side_effects_list_add(seffects, &iseff->seffect);
+					}
+
+					iseff = iseff->next;
+				}
+			}
+		}
+	}
+
+	if (preserve_mail) {
+		raction->action.mail = sieve_message_get_mail(renv->msgctx);
+		sieve_message_snapshot(renv->msgctx);
+	} else {
+		raction->action.mail = NULL;
+	}
+
+	sieve_result_init_action_event(result, &raction->action, !keep);
+	return 0;
+}
+
+int sieve_result_add_action(const struct sieve_runtime_env *renv,
+			    const struct sieve_extension *ext, const char *name,
+			    const struct sieve_action_def *act_def,
+			    struct sieve_side_effects_list *seffects,
+			    void *context, unsigned int instance_limit,
+			    bool preserve_mail)
+{
+	return _sieve_result_add_action(renv, ext, name, act_def, seffects,
+					context, instance_limit, preserve_mail,
+					FALSE);
+}
+
+int sieve_result_add_keep(const struct sieve_runtime_env *renv,
+			  struct sieve_side_effects_list *seffects)
+{
+	return _sieve_result_add_action(renv, renv->result->keep_action.ext,
+					"keep", renv->result->keep_action.def,
+					seffects, NULL, 0, TRUE, TRUE);
+}
+
+void sieve_result_set_keep_action(struct sieve_result *result,
+				  const struct sieve_extension *ext,
+				  const struct sieve_action_def *act_def)
+{
+	result->keep_action.def = act_def;
+	result->keep_action.ext = ext;
+}
+
+void sieve_result_set_failure_action(struct sieve_result *result,
+				     const struct sieve_extension *ext,
+				     const struct sieve_action_def *act_def)
+{
+	result->failure_action.def = act_def;
+	result->failure_action.ext = ext;
+}
+
+/*
+ * Result printing
+ */
+
+void sieve_result_vprintf(const struct sieve_result_print_env *penv,
+			  const char *fmt, va_list args)
+{
+	string_t *outbuf = t_str_new(128);
+
+	str_vprintfa(outbuf, fmt, args);
+
+	o_stream_nsend(penv->stream, str_data(outbuf), str_len(outbuf));
+}
+
+void sieve_result_printf(const struct sieve_result_print_env *penv,
+			 const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	sieve_result_vprintf(penv, fmt, args);
+	va_end(args);
+}
+
+void sieve_result_action_printf(const struct sieve_result_print_env *penv,
+				const char *fmt, ...)
+{
+	string_t *outbuf = t_str_new(128);
+	va_list args;
+
+	va_start(args, fmt);
+	str_append(outbuf, " * ");
+	str_vprintfa(outbuf, fmt, args);
+	str_append_c(outbuf, '\n');
+	va_end(args);
+
+	o_stream_nsend(penv->stream, str_data(outbuf), str_len(outbuf));
+}
+
+void sieve_result_seffect_printf(const struct sieve_result_print_env *penv,
+				 const char *fmt, ...)
+{
+	string_t *outbuf = t_str_new(128);
+	va_list args;
+
+	va_start(args, fmt);
+	str_append(outbuf, "        + ");
+	str_vprintfa(outbuf, fmt, args);
+	str_append_c(outbuf, '\n');
+	va_end(args);
+
+	o_stream_nsend(penv->stream, str_data(outbuf), str_len(outbuf));
+}
+
+static void
+sieve_result_print_side_effects(struct sieve_result_print_env *rpenv,
+				const struct sieve_action *action,
+				struct sieve_side_effects_list *slist,
+				bool *implicit_keep)
+{
+	struct sieve_result_side_effect *rsef;
+
+	/* Print side effects */
+	rsef = (slist != NULL ? slist->first_effect : NULL);
+	while (rsef != NULL) {
+		const struct sieve_side_effect *sef = &rsef->seffect;
+
+		i_assert(sef->def != NULL);
+
+		if (sef->def->print != NULL) {
+			sef->def->print(sef, action, rpenv,
+					implicit_keep);
+		}
+		rsef = rsef->next;
+	}
+}
+
+static void
+sieve_result_print_implicit_side_effects(struct sieve_result_print_env *rpenv)
+{
+	struct sieve_result *result = rpenv->result;
+	bool dummy = TRUE;
+
+	/* Print any implicit side effects if applicable */
+	if (hash_table_is_created(result->action_contexts)) {
+		struct sieve_result_action_context *actctx;
+
+		/* Check for implicit side effects to keep action */
+		actctx = hash_table_lookup(rpenv->result->action_contexts,
+					   &act_store);
+
+		if (actctx != NULL && actctx->seffects != NULL) {
+			sieve_result_print_side_effects(
+				rpenv, &result->keep_action,
+				actctx->seffects, &dummy);
+		}
+	}
+}
+
+bool sieve_result_print(struct sieve_result *result,
+			const struct sieve_script_env *senv,
+			struct ostream *stream, bool *keep)
+{
+	struct sieve_action act_keep = result->keep_action;
+	struct sieve_result_print_env penv;
+	bool implicit_keep = TRUE, printed_any = FALSE;
+	struct sieve_result_action *rac;
+
+	if (keep != NULL)
+		*keep = FALSE;
+
+	/* Prepare environment */
+
+	penv.result = result;
+	penv.stream = stream;
+	penv.scriptenv = senv;
+
+	sieve_result_printf(&penv, "\nPerformed actions:\n\n");
+
+	rac = result->actions_head;
+	while (rac != NULL) {
+		bool impl_keep = TRUE;
+		const struct sieve_action *act = &rac->action;
+
+		if (act->exec_seq < result->exec_seq) {
+			rac = rac->next;
+			continue;
+		}
+
+		if (rac->action.keep && keep != NULL)
+			*keep = TRUE;
+
+		if (act->def != NULL) {
+			if (act->def->print != NULL)
+				act->def->print(act, &penv, &impl_keep);
+			else {
+				sieve_result_action_printf(
+					&penv, "%s", act->def->name);
+			}
+		} else {
+			if (act->keep) {
+				sieve_result_action_printf(&penv, "keep");
+				impl_keep = FALSE;
+			} else {
+				sieve_result_action_printf(&penv, "[NULL]");
+			}
+		}
+		printed_any = TRUE;
+
+		/* Print side effects */
+		sieve_result_print_side_effects(
+			&penv, &rac->action, rac->seffects, &impl_keep);
+
+		implicit_keep = implicit_keep && impl_keep;
+
+		rac = rac->next;
+	}
+	if (!printed_any)
+		sieve_result_printf(&penv, "  (none)\n");
+
+	if (implicit_keep && keep != NULL)
+		*keep = TRUE;
+
+	sieve_result_printf(&penv, "\nImplicit keep:\n\n");
+
+	if (implicit_keep) {
+		bool dummy = TRUE;
+
+		if (act_keep.def == NULL) {
+			sieve_result_action_printf(&penv, "keep");
+
+			sieve_result_print_implicit_side_effects(&penv);
+		} else {
+			/* Scan for execution of keep-equal actions */
+			rac = result->actions_head;
+			while (act_keep.def != NULL && rac != NULL) {
+				if (rac->action.def == act_keep.def &&
+				    act_keep.def->equals != NULL &&
+				    act_keep.def->equals(senv, NULL, &rac->action) &&
+				    sieve_action_is_executed(&rac->action,
+							     result))
+					act_keep.def = NULL;
+
+				rac = rac->next;
+			}
+
+			if (act_keep.def == NULL) {
+				sieve_result_printf(&penv,
+					"  (none; keep or equivalent action executed earlier)\n");
+			} else {
+				act_keep.def->print(&act_keep, &penv, &dummy);
+
+				sieve_result_print_implicit_side_effects(&penv);
+			}
+		}
+	} else {
+		sieve_result_printf(&penv, "  (none)\n");
+	}
+
+	sieve_result_printf(&penv, "\n");
+
+	return TRUE;
+}
+
+/*
+ * Result execution
+ */
+
+struct sieve_side_effect_execution {
+	struct sieve_result_side_effect *seffect;
+
+	void *tr_context;
+
+	struct sieve_side_effect_execution *prev, *next;
+};
+
+struct sieve_action_execution {
+	struct sieve_result_action *action;
+	unsigned int exec_seq;
+	struct sieve_action_execution *prev, *next;
+
+	struct sieve_side_effect_execution *seffects_head, *seffects_tail;
+
+	struct sieve_error_handler *ehandler;
+	void *tr_context;
+	enum sieve_action_execution_state state;
+	int status;
+
+	bool commit:1;
+};
+
+struct sieve_result_execution {
+	pool_t pool;
+	struct sieve_action_exec_env action_env;
+	struct sieve_error_handler *ehandler;
+	struct event *event;
+
+	int status;
+
+	struct sieve_action_execution *actions_head, *actions_tail;
+
+	struct sieve_result_action keep_action;
+	struct sieve_action_execution keep;
+	struct sieve_action_execution *keep_equiv_action;
+	int keep_status;
+
+	bool keep_success:1;
+	bool keep_explicit:1;
+	bool keep_implicit:1;
+	bool keep_finalizing:1;
+	bool seen_delivery:1;
+	bool executed:1;
+	bool executed_delivery:1;
+	bool committed:1;
+};
+
+void sieve_result_mark_executed(struct sieve_result *result)
+{
+	result->exec_seq++;
+}
+
+/* Side effect */
+
+static int
+sieve_result_side_effect_pre_execute(struct sieve_result_execution *rexec,
+				     struct sieve_action_execution *aexec,
+				     struct sieve_side_effect_execution *seexec)
+{
+	struct sieve_result_side_effect *rsef = seexec->seffect;
+	struct sieve_side_effect *sef = &rsef->seffect;
+
+	i_assert(sef->def != NULL);
+	if (sef->def->pre_execute == NULL)
+		return SIEVE_EXEC_OK;
+
+	return sef->def->pre_execute(sef, &rexec->action_env,
+				     aexec->tr_context, &seexec->tr_context);
+}
+
+static int
+sieve_result_side_effect_post_execute(
+	struct sieve_result_execution *rexec,
+	struct sieve_action_execution *aexec,
+	struct sieve_side_effect_execution *seexec, bool *impl_keep)
+{
+	struct sieve_result_side_effect *rsef = seexec->seffect;
+	struct sieve_side_effect *sef = &rsef->seffect;
+
+	i_assert(sef->def != NULL);
+	if (sef->def->post_execute == NULL)
+		return SIEVE_EXEC_OK;
+
+	return sef->def->post_execute(sef, &rexec->action_env,
+				      aexec->tr_context, seexec->tr_context,
+				      impl_keep);
+}
+
+static void
+sieve_result_side_effect_post_commit(struct sieve_result_execution *rexec,
+				     struct sieve_action_execution *aexec,
+				     struct sieve_side_effect_execution *seexec,
+				     int commit_status)
+{
+	struct sieve_result_side_effect *rsef = seexec->seffect;
+	struct sieve_side_effect *sef = &rsef->seffect;
+
+	i_assert(sef->def != NULL);
+	if (sef->def->post_commit == NULL)
+		return;
+
+	sef->def->post_commit(sef, &rexec->action_env,
+			      aexec->tr_context, seexec->tr_context,
+			      commit_status);
+}
+
+static void
+sieve_result_side_effect_rollback(struct sieve_result_execution *rexec,
+				  struct sieve_action_execution *aexec,
+				  struct sieve_side_effect_execution *seexec)
+{
+	struct sieve_result_side_effect *rsef = seexec->seffect;
+	struct sieve_side_effect *sef = &rsef->seffect;
+
+	i_assert(sef->def != NULL);
+	if (sef->def->rollback == NULL)
+		return;
+
+	sef->def->rollback(sef, &rexec->action_env,
+			   aexec->tr_context, seexec->tr_context,
+			   (aexec->status == SIEVE_EXEC_OK));
+}
+
+static void
+sieve_action_execution_add_side_effect(struct sieve_result_execution *rexec,
+				       struct sieve_action_execution *aexec,
+				       struct sieve_result_side_effect *seffect)
+{
+	struct sieve_side_effect_execution *seexec;
+
+	seexec = aexec->seffects_head;
+	while (seexec != NULL) {
+		if (seexec->seffect == seffect)
+			return;
+		seexec = seexec->next;
+	}
+
+	seexec = p_new(rexec->pool, struct sieve_side_effect_execution, 1);
+	seexec->seffect = seffect;
+
+	DLLIST2_APPEND(&aexec->seffects_head, &aexec->seffects_tail, seexec);
+}
+
+static void
+sieve_action_execution_add_side_effects(struct sieve_result_execution *rexec,
+				        struct sieve_action_execution *aexec,
+					struct sieve_result_action *rac)
+{
+	struct sieve_result_side_effect *rsef;
+
+	rsef = (rac->seffects == NULL ? NULL : rac->seffects->first_effect);
+	while (rsef != NULL) {
+		sieve_action_execution_add_side_effect(rexec, aexec, rsef);
+		rsef = rsef->next;
+	}
+}
+
+/* Action */
+
+static void
+sieve_action_execution_pre(struct sieve_result_execution *rexec,
+			   struct sieve_action_execution *aexec)
+{
+	if (aexec->ehandler == NULL)
+		aexec->ehandler = rexec->ehandler;
+	rexec->action_env.action = &aexec->action->action;
+	rexec->action_env.event = aexec->action->action.event;
+	rexec->action_env.ehandler = aexec->ehandler;
+}
+
+static void
+sieve_action_execution_post(struct sieve_result_execution *rexec)
+{
+	rexec->action_env.action = NULL;
+	rexec->action_env.event = rexec->action_env.result->event;
+	rexec->action_env.ehandler = NULL;
+}
+
+static int
+sieve_result_action_start(struct sieve_result_execution *rexec,
+			  struct sieve_action_execution *aexec)
+{
+	struct sieve_result_action *rac = aexec->action;
+	struct sieve_action *act = &rac->action;
+	int status = SIEVE_EXEC_OK;
+
+	/* Skip actions that are already started. */
+	if (aexec->state >= SIEVE_ACTION_EXECUTION_STATE_STARTED)
+		return status;
+	aexec->state = SIEVE_ACTION_EXECUTION_STATE_STARTED;
+	aexec->status = status;
+
+	/* Skip non-actions (inactive keep). */
+	if (act->def == NULL)
+		return status;
+
+	if (act->def->start != NULL) {
+		sieve_action_execution_pre(rexec, aexec);
+		status = act->def->start(&rexec->action_env,
+					 &aexec->tr_context);
+		aexec->status = status;
+		sieve_action_execution_post(rexec);
+	}
+	return status;
+}
+
+static int
+sieve_result_action_execute(struct sieve_result_execution *rexec,
+			    struct sieve_action_execution *aexec,
+			    int start_status)
+{
+	struct sieve_result_action *rac = aexec->action;
+	struct sieve_action *act = &rac->action;
+	struct sieve_side_effect_execution *seexec;
+	int status = start_status;
+	bool impl_keep = TRUE;
+
+	/* Skip actions that are already executed. */
+	if (aexec->state >= SIEVE_ACTION_EXECUTION_STATE_EXECUTED)
+		return status;
+	aexec->state = SIEVE_ACTION_EXECUTION_STATE_EXECUTED;
+
+	/* Record explicit keep when it is not the final implicit keep */
+	if (act->keep && aexec != &rexec->keep)
+		rexec->keep_explicit = TRUE;
+
+	/* Skip non-actions (inactive keep) */
+	if (act->def == NULL) {
+		i_assert(aexec != &rexec->keep);
+		if (act->keep)
+			e_debug(rexec->event, "Executed explicit keep");
+		return status;
+	}
+
+	/* Don't execute if others already failed */
+	if (status != SIEVE_EXEC_OK)
+		return status;
+
+	if (aexec == &rexec->keep)
+		e_debug(rexec->event, "Executing implicit keep action");
+	else {
+		e_debug(rexec->event, "Executing %s action%s",
+			sieve_action_name(act),
+			(act->keep ? " (explicit keep)" : ""));
+	}
+
+	sieve_action_execution_pre(rexec, aexec);
+
+	/* Execute pre-execute event of side effects */
+	seexec = aexec->seffects_head;
+	while (status == SIEVE_EXEC_OK && seexec != NULL) {
+		status = sieve_result_side_effect_pre_execute(
+			rexec, aexec, seexec);
+		seexec = seexec->next;
+	}
+
+	/* Execute the action itself */
+	if (status == SIEVE_EXEC_OK && act->def != NULL &&
+	    act->def->execute != NULL) {
+		status = act->def->execute(&rexec->action_env,
+					   aexec->tr_context,
+					   &impl_keep);
+		if (status == SIEVE_EXEC_OK)
+			rexec->executed = TRUE;
+	}
+
+	/* Execute post-execute event of side effects */
+	seexec = aexec->seffects_head;
+	while (status == SIEVE_EXEC_OK && seexec != NULL) {
+		status = sieve_result_side_effect_post_execute(
+			rexec, aexec, seexec, &impl_keep);
+		seexec = seexec->next;
+	}
+
+	if (aexec == &rexec->keep) {
+		e_debug(rexec->event,
+			"Finished executing implicit keep action (status=%s)",
+			sieve_execution_exitcode_to_str(status));
+	} else {
+		e_debug(rexec->event, "Finished executing %s action "
+			"(status=%s, keep=%s)", sieve_action_name(act),
+			sieve_execution_exitcode_to_str(status),
+			(act->keep ? "explicit" :
+			 (impl_keep && rexec->keep_implicit ?
+			  "implicit" : "canceled")));
+	}
+
+	if (status == SIEVE_EXEC_OK &&
+	    (act->def->flags & SIEVE_ACTFLAG_TRIES_DELIVER) != 0)
+		rexec->seen_delivery = TRUE;
+
+	/* Update implicit keep status (but only when we're not running the
+	   implicit keep right now). */
+	if (aexec != &rexec->keep)
+		rexec->keep_implicit = rexec->keep_implicit && impl_keep;
+
+	sieve_action_execution_post(rexec);
+
+	aexec->status = status;
+	return status;
+}
+
+static int
+sieve_result_action_commit(struct sieve_result_execution *rexec,
+			   struct sieve_action_execution *aexec)
+{
+	struct sieve_result_action *rac = aexec->action;
+	struct sieve_action *act = &rac->action;
+	struct sieve_side_effect_execution *seexec;
+	int cstatus = SIEVE_EXEC_OK;
+
+	if (aexec == &rexec->keep) {
+		e_debug(rexec->event, "Commit implicit keep action");
+	} else {
+		e_debug(rexec->event, "Commit %s action%s",
+			sieve_action_name(act),
+			(act->keep ? " (explicit keep)" : ""));
+	}
+
+	sieve_action_execution_pre(rexec, aexec);
+
+	if (act->def->commit != NULL) {
+		cstatus = act->def->commit(&rexec->action_env,
+					   aexec->tr_context);
+		if (cstatus == SIEVE_EXEC_OK)
+			rexec->committed = TRUE;
+	}
+
+	/* Execute post_commit event of side effects */
+	seexec = aexec->seffects_head;
+	while (seexec != NULL) {
+		sieve_result_side_effect_post_commit(
+			rexec, aexec, seexec, cstatus);
+		seexec = seexec->next;
+	}
+
+	sieve_action_execution_post(rexec);
+
+	return cstatus;
+}
+
+static void
+sieve_result_action_rollback(struct sieve_result_execution *rexec,
+			     struct sieve_action_execution *aexec)
+{
+	struct sieve_result_action *rac = aexec->action;
+	struct sieve_action *act = &rac->action;
+	struct sieve_side_effect_execution *seexec;
+
+	if (aexec == &rexec->keep) {
+		e_debug(rexec->event, "Roll back implicit keep action");
+	} else {
+		e_debug(rexec->event, "Roll back %s action%s",
+			sieve_action_name(act),
+			(act->keep ? " (explicit keep)" : ""));
+	}
+
+	sieve_action_execution_pre(rexec, aexec);
+
+	if (act->def->rollback != NULL) {
+		act->def->rollback(&rexec->action_env, aexec->tr_context,
+				   (aexec->status == SIEVE_EXEC_OK));
+	}
+
+	/* Rollback side effects */
+	seexec = aexec->seffects_head;
+	while (seexec != NULL) {
+		sieve_result_side_effect_rollback(rexec, aexec, seexec);
+		seexec = seexec->next;
+	}
+
+	sieve_action_execution_post(rexec);
+}
+
+static int
+sieve_result_action_commit_or_rollback(struct sieve_result_execution *rexec,
+				       struct sieve_action_execution *aexec,
+				       int status, int *commit_status)
+{
+	struct sieve_result_action *rac = aexec->action;
+	struct sieve_action *act = &rac->action;
+
+	/* Skip actions that are already finalized. */
+	if (aexec->state >= SIEVE_ACTION_EXECUTION_STATE_FINALIZED)
+		return status;
+	aexec->state = SIEVE_ACTION_EXECUTION_STATE_FINALIZED;
+
+	if (aexec == &rexec->keep) {
+		e_debug(rexec->event, "Finalize implicit keep action"
+			"(status=%s, action_status=%s, commit_status=%s)",
+			sieve_execution_exitcode_to_str(status),
+			sieve_execution_exitcode_to_str(aexec->status),
+			sieve_execution_exitcode_to_str(*commit_status));
+	} else {
+		e_debug(rexec->event, "Finalize %s action "
+			"(%sstatus=%s, action_status=%s, commit_status=%s, "
+			 "pre-commit=%s)",
+			sieve_action_name(act),
+			(act->keep ? "explicit keep, " : ""),
+			sieve_execution_exitcode_to_str(status),
+			sieve_execution_exitcode_to_str(aexec->status),
+			sieve_execution_exitcode_to_str(*commit_status),
+			(aexec->commit ? "yes" : "no"));
+	}
+
+	/* Skip non-actions (inactive keep) */
+	if (act->def == NULL)
+		return status;
+
+	if (aexec->status == SIEVE_EXEC_OK &&
+	    (status == SIEVE_EXEC_OK ||
+	     (aexec->commit && *commit_status == SIEVE_EXEC_OK))) {
+		int cstatus = SIEVE_EXEC_OK;
+
+		cstatus = sieve_result_action_commit(rexec, aexec);
+		if (cstatus != SIEVE_EXEC_OK) {
+			/* This is bad; try to salvage as much as possible */
+			if (*commit_status == SIEVE_EXEC_OK) {
+				*commit_status = cstatus;
+				if (!rexec->committed) {
+					/* We haven't executed anything yet;
+					   continue as rollback */
+					status = cstatus;
+				}
+			}
+		}
+	} else {
+		sieve_result_action_rollback(rexec, aexec);
+	}
+
+	if (act->keep) {
+		if (status == SIEVE_EXEC_FAILURE)
+			status = SIEVE_EXEC_KEEP_FAILED;
+		if (*commit_status == SIEVE_EXEC_FAILURE)
+			*commit_status = SIEVE_EXEC_KEEP_FAILED;
+	}
+
+	return status;
+}
+
+static void
+sieve_result_action_finish(struct sieve_result_execution *rexec,
+			   struct sieve_action_execution *aexec, int status)
+{
+	struct sieve_result_action *rac = aexec->action;
+	struct sieve_action *act = &rac->action;
+
+	/* Skip non-actions (inactive keep) */
+	if (act->def == NULL)
+		return;
+
+	if (aexec == &rexec->keep) {
+		e_debug(rexec->event, "Finish implicit keep action");
+	} else {
+		e_debug(rexec->event, "Finish %s action%s",
+			sieve_action_name(act),
+			(act->keep ? " (explicit keep)" : ""));
+	}
+
+	if (act->def->finish != NULL) {
+		sieve_action_execution_pre(rexec, aexec);
+		act->def->finish(&rexec->action_env, aexec->tr_context, status);
+		sieve_action_execution_post(rexec);
+	}
+}
+
+static void
+sieve_result_action_abort(struct sieve_result_execution *rexec,
+			  struct sieve_action_execution *aexec)
+{
+	if (aexec->state > SIEVE_ACTION_EXECUTION_STATE_INIT &&
+	    aexec->state < SIEVE_ACTION_EXECUTION_STATE_FINALIZED)
+		sieve_result_action_rollback(rexec, aexec);
+	DLLIST2_REMOVE(&rexec->actions_head, &rexec->actions_tail, aexec);
+}
+
+static void
+sieve_action_execution_update(struct sieve_result_execution *rexec,
+			      struct sieve_action_execution *aexec)
+{
+	const struct sieve_action_exec_env *aenv = &rexec->action_env;
+	struct sieve_result *result = aenv->result;
+	struct sieve_result_action *rac;
+
+	rac = result->actions_head;
+	while (rac != NULL) {
+		if (aexec->action == rac)
+			break;
+		rac = rac->next;
+	}
+
+	if (rac == NULL) {
+		/* Action was removed; abort it. */
+		sieve_result_action_abort(rexec, aexec);
+		return;
+	}
+
+	if (aexec->exec_seq != rac->action.exec_seq) {
+		i_assert(rac->action.keep);
+
+		/* Recycled keep */
+		aexec->exec_seq = rac->action.exec_seq;
+		aexec->state = SIEVE_ACTION_EXECUTION_STATE_INIT;
+	}
+
+	sieve_action_execution_add_side_effects(rexec, aexec, rac);
+}
+
+static void
+sieve_result_execution_add_action(struct sieve_result_execution *rexec,
+				  struct sieve_result_action *rac)
+{
+	struct sieve_action_execution *aexec;
+
+	aexec = rexec->actions_head;
+	while (aexec != NULL) {
+		if (aexec->action == rac)
+			return;
+		aexec = aexec->next;
+	}
+
+	aexec = p_new(rexec->pool, struct sieve_action_execution, 1);
+	aexec->action = rac;
+	aexec->exec_seq = rac->action.exec_seq;
+	aexec->ehandler = rexec->ehandler;
+
+	DLLIST2_APPEND(&rexec->actions_head, &rexec->actions_tail, aexec);
+
+	sieve_action_execution_add_side_effects(rexec, aexec, rac);
+}
+
+/* Result */
+
+struct sieve_result_execution *
+sieve_result_execution_create(struct sieve_result *result, pool_t pool)
+{
+	struct sieve_result_execution *rexec;
+
+	pool_ref(pool);
+	rexec = p_new(pool, struct sieve_result_execution, 1);
+	rexec->pool = pool;
+	rexec->event = result->event;
+	rexec->action_env.result = result;
+	rexec->action_env.event = result->event;
+	rexec->action_env.exec_env = result->exec_env;
+	rexec->action_env.msgctx = result->msgctx;
+	rexec->status = SIEVE_EXEC_OK;
+	rexec->keep_success = TRUE;
+	rexec->keep_status = SIEVE_EXEC_OK;
+	rexec->keep_explicit = FALSE;
+	rexec->keep_implicit = TRUE;
+
+	sieve_result_ref(result);
+	result->exec = rexec;
+
+	return rexec;
+}
+
+void sieve_result_execution_destroy(struct sieve_result_execution **_rexec)
+{
+	struct sieve_result_execution *rexec = *_rexec;
+
+	*_rexec = NULL;
+
+	if (rexec == NULL)
+		return;
+
+	rexec->action_env.result->exec = NULL;
+	sieve_result_unref(&rexec->action_env.result);
+	pool_unref(&rexec->pool);
+}
+
+static void
+sieve_result_implicit_keep_execute(struct sieve_result_execution *rexec)
+{
+	const struct sieve_action_exec_env *aenv = &rexec->action_env;
+	struct sieve_result *result = aenv->result;
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct sieve_action_execution *aexec;
+	int status = SIEVE_EXEC_OK;
+	struct sieve_action_execution *aexec_keep = &rexec->keep;
+	struct sieve_result_action *ract_keep = &rexec->keep_action;
+	struct sieve_action *act_keep = &ract_keep->action;
+	bool success = FALSE;
+
+	switch (rexec->status) {
+	case SIEVE_EXEC_OK:
+		success = TRUE;
+		break;
+	case SIEVE_EXEC_TEMP_FAILURE:
+	case SIEVE_EXEC_RESOURCE_LIMIT:
+		if (rexec->committed) {
+			e_debug(rexec->event,
+				"Temporary failure occurred (status=%s), "
+				"but other actions were already committed: "
+				"execute failure implicit keep",
+				sieve_execution_exitcode_to_str(rexec->status));
+			break;
+		}
+		if (rexec->keep_finalizing)
+			break;
+
+		e_debug(rexec->event,
+			"Skip implicit keep for temporary failure "
+			"(state=execute, status=%s)",
+			sieve_execution_exitcode_to_str(rexec->status));
+		return;
+	default:
+		break;
+	}
+
+	if (rexec->keep_equiv_action != NULL) {
+		e_debug(rexec->event, "No implicit keep needed "
+			"(equivalent action already executed)");
+		return;
+	}
+
+	rexec->keep.action = &rexec->keep_action;
+	rexec->keep.ehandler = rexec->ehandler;
+	rexec->keep_success = success;
+	rexec->keep_status = status;
+
+	if ((eenv->flags & SIEVE_EXECUTE_FLAG_DEFER_KEEP) != 0) {
+		e_debug(rexec->event, "Execution of implicit keep is deferred");
+		return;
+	}
+
+	if (!success)
+		*act_keep = result->failure_action;
+	else
+		*act_keep = result->keep_action;
+	act_keep->name = "keep";
+	act_keep->mail = NULL;
+	act_keep->keep = TRUE;
+
+	/* If keep is a non-action, return right away */
+	if (act_keep->def == NULL) {
+		e_debug(rexec->event, "Keep is not defined yet");
+		return;
+	}
+
+	/* Scan for execution of keep-equal actions */
+	aexec = rexec->actions_head;
+	while (aexec != NULL) {
+		struct sieve_result_action *rac = aexec->action;
+
+		if (rac->action.def == act_keep->def &&
+		    act_keep->def->equals != NULL &&
+		    act_keep->def->equals(eenv->scriptenv, NULL,
+					  &rac->action) &&
+		    aexec->state >= SIEVE_ACTION_EXECUTION_STATE_EXECUTED) {
+			e_debug(rexec->event, "No implicit keep needed "
+				"(equivalent %s action already executed)",
+				sieve_action_name(&rac->action));
+			rexec->keep_equiv_action = aexec;
+			return;
+		}
+
+		aexec = aexec->next;
+	}
+
+	/* Scan for deferred keep */
+	aexec = rexec->actions_tail;
+	while (aexec != NULL) {
+		struct sieve_result_action *rac = aexec->action;
+
+		if (aexec->state < SIEVE_ACTION_EXECUTION_STATE_EXECUTED) {
+			aexec = NULL;
+			break;
+		}
+		if (rac->action.keep && rac->action.def == NULL)
+			break;
+		aexec = aexec->prev;
+	}
+
+	if (aexec == NULL) {
+		if (success)
+			act_keep->mail = sieve_message_get_mail(aenv->msgctx);
+	} else {
+		e_debug(rexec->event, "Found deferred keep action");
+
+		if (success) {
+			act_keep->location = aexec->action->action.location;
+			act_keep->mail = aexec->action->action.mail;
+			ract_keep->seffects = aexec->action->seffects;
+		}
+		aexec->state = SIEVE_ACTION_EXECUTION_STATE_FINALIZED;
+	}
+
+	if (ract_keep->seffects == NULL) {
+		/* Apply any implicit side effects if applicable */
+		if (success && hash_table_is_created(result->action_contexts)) {
+			struct sieve_result_action_context *actctx;
+
+			/* Check for implicit side effects to keep action */
+			actctx = hash_table_lookup(result->action_contexts,
+						   act_keep->def);
+
+			if (actctx != NULL)
+				ract_keep->seffects = actctx->seffects;
+		}
+	}
+
+	e_debug(rexec->event, "Execute implicit keep (status=%s)",
+		sieve_execution_exitcode_to_str(rexec->status));
+
+	/* Initialize side effects */
+	sieve_action_execution_add_side_effects(rexec, aexec_keep, ract_keep);
+
+	/* Initialize keep action event */
+	sieve_result_init_action_event(result, act_keep, FALSE);
+
+	/* Start keep action */
+	status = sieve_result_action_start(rexec, aexec_keep);
+
+	/* Execute keep action */
+	if (status == SIEVE_EXEC_OK)
+		status = sieve_result_action_execute(rexec, aexec_keep, status);
+	if (status == SIEVE_EXEC_OK)
+		aexec_keep->commit = TRUE;
+
+	rexec->executed_delivery = rexec->seen_delivery;
+	rexec->keep_status = status;
+	sieve_action_execution_post(rexec);
+}
+
+static int
+sieve_result_implicit_keep_finalize(struct sieve_result_execution *rexec)
+{
+	const struct sieve_action_exec_env *aenv = &rexec->action_env;
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct sieve_action_execution *aexec_keep = &rexec->keep;
+	struct sieve_result_action *ract_keep = &rexec->keep_action;
+	struct sieve_action *act_keep = &ract_keep->action;
+	int commit_status = SIEVE_EXEC_OK;
+	bool success = FALSE, temp_failure = FALSE;
+
+	switch (rexec->status) {
+	case SIEVE_EXEC_OK:
+		success = TRUE;
+		break;
+	case SIEVE_EXEC_TEMP_FAILURE:
+	case SIEVE_EXEC_RESOURCE_LIMIT:
+		if (rexec->committed) {
+			e_debug(rexec->event,
+				"Temporary failure occurred (status=%s), "
+				"but other actions were already committed: "
+				"commit failure implicit keep",
+				sieve_execution_exitcode_to_str(rexec->status));
+			break;
+		}
+
+		if (aexec_keep->state !=
+		    SIEVE_ACTION_EXECUTION_STATE_EXECUTED) {
+			e_debug(rexec->event,
+				"Skip implicit keep for temporary failure "
+				"(state=commit, status=%s)",
+				sieve_execution_exitcode_to_str(rexec->status));
+			return rexec->status;
+		}
+		/* Roll back for temporary failure when no other action
+		   is committed. */
+		commit_status = rexec->status;
+		temp_failure = TRUE;
+		break;
+	default:
+		break;
+	}
+
+	if ((eenv->flags & SIEVE_EXECUTE_FLAG_DEFER_KEEP) != 0) {
+		e_debug(rexec->event, "Execution of implicit keep is deferred");
+		return rexec->keep_status;
+	}
+
+	rexec->keep_finalizing = TRUE;
+
+	/* Start keep if necessary */
+	if (temp_failure) {
+		rexec->keep_status = rexec->status;
+	} else if (act_keep->def == NULL ||
+		   aexec_keep->state != SIEVE_ACTION_EXECUTION_STATE_EXECUTED) {
+		sieve_result_implicit_keep_execute(rexec);
+	/* Switch to failure keep if necessary. */
+	} else if (rexec->keep_success && !success){
+		e_debug(rexec->event, "Switch to failure implicit keep");
+
+		/* Failed transaction, rollback success keep action. */
+		sieve_result_action_rollback(rexec, aexec_keep);
+
+		event_unref(&act_keep->event);
+		i_zero(aexec_keep);
+
+		/* Start failure keep action. */
+		sieve_result_implicit_keep_execute(rexec);
+	}
+	if (act_keep->def == NULL)
+		return rexec->keep_status;
+
+	if (rexec->keep_equiv_action != NULL) {
+		struct sieve_action_execution *ke_aexec =
+			rexec->keep_equiv_action;
+
+		i_assert(ke_aexec->state >=
+			 SIEVE_ACTION_EXECUTION_STATE_FINALIZED);
+
+		e_debug(rexec->event, "No implicit keep needed "
+			"(equivalent %s action already finalized)",
+			sieve_action_name(&ke_aexec->action->action));
+		return ke_aexec->status;
+	}
+
+	e_debug(rexec->event, "Finalize implicit keep (status=%s)",
+		sieve_execution_exitcode_to_str(rexec->status));
+
+	i_assert(aexec_keep->state == SIEVE_ACTION_EXECUTION_STATE_EXECUTED);
+
+	/* Finalize keep action */
+	rexec->keep_status = sieve_result_action_commit_or_rollback(
+		rexec, aexec_keep, rexec->keep_status, &commit_status);
+
+	/* Finish keep action */
+	sieve_result_action_finish(rexec, aexec_keep,
+				   rexec->keep_status);
+
+	sieve_action_execution_post(rexec);
+	event_unref(&act_keep->event);
+
+	if (rexec->keep_status == SIEVE_EXEC_FAILURE)
+		rexec->keep_status = SIEVE_EXEC_KEEP_FAILED;
+	return rexec->keep_status;
+}
+
+bool sieve_result_executed(struct sieve_result_execution *rexec)
+{
+	return rexec->executed;
+}
+
+bool sieve_result_committed(struct sieve_result_execution *rexec)
+{
+	return rexec->committed;
+}
+
+bool sieve_result_executed_delivery(struct sieve_result_execution *rexec)
+{
+	return rexec->executed_delivery;
+}
+
+static int sieve_result_transaction_start(struct sieve_result_execution *rexec)
+{
+	struct sieve_action_execution *aexec;
+	int status = SIEVE_EXEC_OK;
+
+	e_debug(rexec->event, "Starting execution of actions");
+
+	aexec = rexec->actions_head;
+	while (status == SIEVE_EXEC_OK && aexec != NULL) {
+		status = sieve_result_action_start(rexec, aexec);
+		aexec = aexec->next;
+	}
+	sieve_action_execution_post(rexec);
+
+	return status;
+}
+
+static int
+sieve_result_transaction_execute(struct sieve_result_execution *rexec,
+				 int start_status)
+{
+	struct sieve_action_execution *aexec;
+	int status = SIEVE_EXEC_OK;
+
+	e_debug(rexec->event, "Executing actions");
+
+	rexec->seen_delivery = FALSE;
+	aexec = rexec->actions_head;
+	while (status == SIEVE_EXEC_OK && aexec != NULL) {
+		status = sieve_result_action_execute(rexec, aexec,
+						     start_status);
+		aexec = aexec->next;
+	}
+	sieve_action_execution_post(rexec);
+
+	if (status == SIEVE_EXEC_OK) {
+		/* Since this execution series is successful so far, mark all
+		   actions in it to be committed. */
+		aexec = rexec->actions_head;
+		while (aexec != NULL) {
+			aexec->commit = TRUE;
+			aexec = aexec->next;
+		}
+
+		rexec->executed_delivery =
+			rexec->executed_delivery || rexec->seen_delivery;
+	}
+
+	e_debug(rexec->event, "Finished executing actions "
+		"(status=%s, keep=%s, executed=%s)",
+		sieve_execution_exitcode_to_str(status),
+		(rexec->keep_explicit ? "explicit" :
+		 (rexec->keep_implicit ? "implicit" : "none")),
+		(rexec->executed ? "yes" : "no"));
+	return status;
+}
+
+static int
+sieve_result_transaction_commit_or_rollback(
+	struct sieve_result_execution *rexec, int status)
+{
+	struct sieve_action_execution *aexec;
+	int commit_status = SIEVE_EXEC_OK;
+
+	switch (status) {
+	case SIEVE_EXEC_TEMP_FAILURE:
+		/* Roll back all actions */
+		commit_status = status;
+		break;
+	default:
+		break;
+	}
+
+	e_debug(rexec->event, "Finalizing actions");
+
+	/* First commit/rollback all storage actions */
+	aexec = rexec->actions_head;
+	while (aexec != NULL) {
+		struct sieve_result_action *rac = aexec->action;
+		struct sieve_action *act = &rac->action;
+
+		if (act->def == NULL ||
+		    (act->def->flags & SIEVE_ACTFLAG_MAIL_STORAGE) == 0) {
+			aexec = aexec->next;
+			continue;
+		}
+
+		status = sieve_result_action_commit_or_rollback(
+			rexec, aexec, status, &commit_status);
+
+		aexec = aexec->next;
+	}
+
+	/* Then commit/rollback all other actions */
+	aexec = rexec->actions_head;
+	while (aexec != NULL) {
+		struct sieve_result_action *rac = aexec->action;
+		struct sieve_action *act = &rac->action;
+
+		if (act->def != NULL &&
+		    (act->def->flags & SIEVE_ACTFLAG_MAIL_STORAGE) != 0) {
+			aexec = aexec->next;
+			continue;
+		}
+
+		status = sieve_result_action_commit_or_rollback(
+			rexec, aexec, status, &commit_status);
+
+		aexec = aexec->next;
+	}
+
+	e_debug(rexec->event, "Finished finalizing actions "
+		"(status=%s, keep=%s, committed=%s)",
+		sieve_execution_exitcode_to_str(status),
+		(rexec->keep_explicit ? "explicit" :
+		 (rexec->keep_implicit ? "implicit" : "none")),
+		(rexec->committed ? "yes" : "no"));
+
+	return commit_status;
+}
+
+static void
+sieve_result_transaction_finish(struct sieve_result_execution *rexec,
+				int status)
+{
+	struct sieve_action_execution *aexec;
+
+	e_debug(rexec->event, "Finishing actions");
+
+	aexec = rexec->actions_head;
+	while (aexec != NULL) {
+		sieve_result_action_finish(rexec, aexec, status);
+		aexec = aexec->next;
+	}
+	sieve_action_execution_post(rexec);
+}
+
+static void
+sieve_result_execute_update_status(struct sieve_result_execution *rexec,
+				   int status)
+{
+	switch (status) {
+	case SIEVE_EXEC_OK:
+		break;
+	case SIEVE_EXEC_TEMP_FAILURE:
+		rexec->status = status;
+		break;
+	case SIEVE_EXEC_BIN_CORRUPT:
+		i_unreached();
+	case SIEVE_EXEC_FAILURE:
+	case SIEVE_EXEC_KEEP_FAILED:
+		if (rexec->status == SIEVE_EXEC_OK)
+			rexec->status = status;
+		break;
+	case SIEVE_EXEC_RESOURCE_LIMIT:
+		if (rexec->status != SIEVE_EXEC_TEMP_FAILURE)
+			rexec->status = status;
+		break;
+	}
+}
+
+static void
+sieve_result_execution_update(struct sieve_result_execution *rexec)
+{
+	const struct sieve_action_exec_env *aenv = &rexec->action_env;
+	struct sieve_result *result = aenv->result;
+	struct sieve_action_execution *aexec;
+	struct sieve_result_action *rac;
+
+	aexec = rexec->actions_head;
+	while (aexec != NULL) {
+		struct sieve_action_execution *aexec_next = aexec->next;
+
+		sieve_action_execution_update(rexec, aexec);
+		aexec = aexec_next;
+	}
+
+	rac = result->actions_head;
+	while (rac != NULL) {
+		sieve_result_execution_add_action(rexec, rac);
+		rac = rac->next;
+	}
+}
+
+int sieve_result_execute(struct sieve_result_execution *rexec, int status,
+			 bool commit, struct sieve_error_handler *ehandler,
+			 bool *keep_r)
+{
+	const struct sieve_action_exec_env *aenv = &rexec->action_env;
+	struct sieve_result *result = aenv->result;
+	int result_status, ret;
+
+	e_debug(rexec->event, "Executing result (status=%s, commit=%s)",
+		sieve_execution_exitcode_to_str(status),
+		(commit ? "yes" : "no"));
+
+	if (keep_r != NULL)
+		*keep_r = FALSE;
+	sieve_result_mark_executed(result);
+
+	/* Prepare environment */
+
+	rexec->ehandler = ehandler;
+
+	/* Update actions in execution from result */
+
+	sieve_result_execution_update(rexec);
+
+	/* Transaction start and execute */
+
+	if (status != SIEVE_EXEC_OK) {
+		sieve_result_execute_update_status(rexec, status);
+	} else if (rexec->status == SIEVE_EXEC_OK) {
+		/* Transaction start */
+
+		status = sieve_result_transaction_start(rexec);
+
+		/* Transaction execute */
+
+		status = sieve_result_transaction_execute(rexec, status);
+		sieve_result_execute_update_status(rexec, status);
+	}
+
+	if (!commit) {
+		sieve_action_execution_post(rexec);
+		rexec->ehandler = NULL;
+
+		/* Merge explicit keep status into implicit keep for the next
+		   execution round. */
+		rexec->keep_implicit = (rexec->keep_explicit ||
+					rexec->keep_implicit);
+		rexec->keep_explicit = FALSE;
+
+		e_debug(rexec->event, "Finished executing result "
+			"(no commit, status=%s, keep=%s)",
+			sieve_execution_exitcode_to_str(rexec->status),
+			(rexec->keep_implicit ? "yes" : "no"));
+
+		if (keep_r != NULL)
+			*keep_r = rexec->keep_implicit;
+		return rexec->status;
+	}
+
+	/* Execute implicit keep if the transaction failed or when the
+	   implicit keep was not canceled during transaction.
+	 */
+	if (rexec->status != SIEVE_EXEC_OK || rexec->keep_implicit)
+		sieve_result_implicit_keep_execute(rexec);
+
+	/* Transaction commit/rollback */
+
+	status = sieve_result_transaction_commit_or_rollback(rexec, status);
+	sieve_result_execute_update_status(rexec, status);
+
+	/* Commit implicit keep if necessary */
+
+	result_status = rexec->status;
+
+	/* Commit implicit keep if the transaction failed or when the
+	   implicit keep was not canceled during transaction.
+	 */
+	if (rexec->status != SIEVE_EXEC_OK || rexec->keep_implicit) {
+		ret = sieve_result_implicit_keep_finalize(rexec);
+		switch (ret) {
+		case SIEVE_EXEC_OK:
+			if (result_status == SIEVE_EXEC_TEMP_FAILURE)
+				result_status = SIEVE_EXEC_FAILURE;
+			break;
+		case SIEVE_EXEC_TEMP_FAILURE:
+		case SIEVE_EXEC_RESOURCE_LIMIT:
+			if (!rexec->committed) {
+				result_status = ret;
+				break;
+			}
+			/* fall through */
+		default:
+			result_status = SIEVE_EXEC_KEEP_FAILED;
+		}
+	}
+	if (rexec->status == SIEVE_EXEC_OK)
+		rexec->status = result_status;
+
+	/* Finish execution */
+
+	sieve_result_transaction_finish(rexec, rexec->status);
+
+	sieve_action_execution_post(rexec);
+	rexec->ehandler = NULL;
+
+	rexec->status = result_status;
+
+	/* Merge explicit keep status into implicit keep (in this case only for
+	   completeness).
+	 */
+	rexec->keep_implicit = (rexec->keep_explicit ||
+				rexec->keep_implicit);
+	rexec->keep_explicit = FALSE;
+
+	e_debug(rexec->event, "Finished executing result "
+		"(final, status=%s, keep=%s)",
+		sieve_execution_exitcode_to_str(result_status),
+		(rexec->keep_implicit ? "yes" : "no"));
+
+	if (keep_r != NULL)
+		*keep_r = rexec->keep_implicit;
+	return result_status;
+}
+
+/*
+ * Result evaluation
+ */
+
+struct sieve_result_iterate_context {
+	struct sieve_result *result;
+	struct sieve_result_action *current_action;
+	struct sieve_result_action *next_action;
+};
+
+struct sieve_result_iterate_context *
+sieve_result_iterate_init(struct sieve_result *result)
+{
+	struct sieve_result_iterate_context *rictx =
+		t_new(struct sieve_result_iterate_context, 1);
+
+	rictx->result = result;
+	rictx->current_action = NULL;
+	rictx->next_action = result->actions_head;
+
+	return rictx;
+}
+
+const struct sieve_action *
+sieve_result_iterate_next(struct sieve_result_iterate_context *rictx,
+			  bool *keep)
+{
+	struct sieve_result_action *rac;
+
+	if (rictx == NULL)
+		return  NULL;
+
+	rac = rictx->current_action = rictx->next_action;
+	if (rac != NULL) {
+		rictx->next_action = rac->next;
+
+		if (keep != NULL)
+			*keep = rac->action.keep;
+
+		return &rac->action;
+	}
+
+	return NULL;
+}
+
+void sieve_result_iterate_delete(struct sieve_result_iterate_context *rictx)
+{
+	struct sieve_result *result;
+	struct sieve_result_action *rac;
+
+	if (rictx == NULL || rictx->current_action == NULL)
+		return;
+
+	result = rictx->result;
+	rac = rictx->current_action;
+
+	/* Delete action */
+
+	if (rac->prev == NULL)
+		result->actions_head = rac->next;
+	else
+		rac->prev->next = rac->next;
+
+	if (rac->next == NULL)
+		result->actions_tail = rac->prev;
+	else
+		rac->next->prev = rac->prev;
+
+	sieve_result_action_deinit(rac);
+
+	/* Skip to next action in iteration */
+
+	rictx->current_action = NULL;
+}
+
+/*
+ * Side effects list
+ */
+
+struct sieve_side_effects_list *
+sieve_side_effects_list_create(struct sieve_result *result)
+{
+	struct sieve_side_effects_list *list =
+		p_new(result->pool, struct sieve_side_effects_list, 1);
+
+	list->result = result;
+	list->first_effect = NULL;
+	list->last_effect = NULL;
+
+	return list;
+}
+
+void sieve_side_effects_list_add(struct sieve_side_effects_list *list,
+				 const struct sieve_side_effect *seffect)
+{
+	struct sieve_result_side_effect *reffect, *reffect_pos;
+
+	/* Prevent duplicates */
+	reffect = list->first_effect;
+	reffect_pos = NULL;
+	while (reffect != NULL) {
+		const struct sieve_side_effect_def *ref_def = reffect->seffect.def;
+		const struct sieve_side_effect_def *sef_def = seffect->def;
+
+		i_assert(ref_def != NULL);
+		i_assert(sef_def != NULL);
+
+		if (sef_def == ref_def) {
+			/* already listed */
+			i_assert(reffect_pos == NULL);
+			return;
+		}
+		if (sef_def->precedence > ref_def->precedence) {
+			/* insert it before this position */
+			reffect_pos = reffect;
+		}
+
+		reffect = reffect->next;
+	}
+
+	/* Create new side effect object */
+	reffect = p_new(list->result->pool, struct sieve_result_side_effect, 1);
+	reffect->seffect = *seffect;
+
+	if (reffect_pos != NULL) {
+		/* Insert */
+		reffect->next = reffect_pos;
+		reffect_pos->prev = reffect;
+		if (list->first_effect == reffect_pos)
+			list->first_effect = reffect;
+	} else {
+		/* Add */
+		if ( list->first_effect == NULL ) {
+			list->first_effect = reffect;
+			list->last_effect = reffect;
+			reffect->prev = NULL;
+			reffect->next = NULL;
+		} else {
+			list->last_effect->next = reffect;
+			reffect->prev = list->last_effect;
+			list->last_effect = reffect;
+			reffect->next = NULL;
+		}
+	}
+}
+
+/*
+ * Error handling
+ */
+
+#undef sieve_result_error
+void sieve_result_error(const struct sieve_action_exec_env *aenv,
+			const char *csrc_filename, unsigned int csrc_linenum,
+			const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_ERROR,
+		.event = aenv->event,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+	};
+	va_list args;
+
+	va_start(args, fmt);
+	sieve_logv(aenv->ehandler, &params, fmt, args);
+	va_end(args);
+}
+
+#undef sieve_result_global_error
+void sieve_result_global_error(const struct sieve_action_exec_env *aenv,
+			       const char *csrc_filename,
+			       unsigned int csrc_linenum, const char *fmt, ...)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_ERROR,
+		.event = aenv->event,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+	};
+	va_list args;
+
+	va_start(args, fmt);
+	sieve_global_logv(eenv->svinst, aenv->ehandler, &params, fmt, args);
+	va_end(args);
+}
+
+#undef sieve_result_warning
+void sieve_result_warning(const struct sieve_action_exec_env *aenv,
+			  const char *csrc_filename, unsigned int csrc_linenum,
+			  const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_WARNING,
+		.event = aenv->event,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+	};
+	va_list args;
+
+	va_start(args, fmt);
+	sieve_logv(aenv->ehandler, &params, fmt, args);
+	va_end(args);
+}
+
+#undef sieve_result_global_warning
+void sieve_result_global_warning(const struct sieve_action_exec_env *aenv,
+				 const char *csrc_filename,
+				 unsigned int csrc_linenum,
+				 const char *fmt, ...)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_WARNING,
+		.event = aenv->event,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+	};
+	va_list args;
+
+	va_start(args, fmt);
+	sieve_global_logv(eenv->svinst, aenv->ehandler, &params, fmt, args);
+	va_end(args);
+}
+
+#undef sieve_result_log
+void sieve_result_log(const struct sieve_action_exec_env *aenv,
+		      const char *csrc_filename, unsigned int csrc_linenum,
+		      const char *fmt, ...)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct sieve_error_params params = {
+		.log_type = (HAS_ALL_BITS(eenv->flags,
+					  SIEVE_EXECUTE_FLAG_LOG_RESULT) ?
+			     LOG_TYPE_INFO : LOG_TYPE_DEBUG),
+		.event = aenv->event,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+	};
+	va_list args;
+
+	va_start(args, fmt);
+	sieve_logv(aenv->ehandler, &params, fmt, args);
+	va_end(args);
+}
+
+#undef sieve_result_global_log
+void sieve_result_global_log(const struct sieve_action_exec_env *aenv,
+			     const char *csrc_filename,
+			     unsigned int csrc_linenum, const char *fmt, ...)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct sieve_error_params params = {
+		.log_type = (HAS_ALL_BITS(eenv->flags,
+					  SIEVE_EXECUTE_FLAG_LOG_RESULT) ?
+			     LOG_TYPE_INFO : LOG_TYPE_DEBUG),
+		.event = aenv->event,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+	};
+	va_list args;
+
+	va_start(args, fmt);
+	sieve_global_logv(eenv->svinst, aenv->ehandler, &params, fmt, args);
+	va_end(args);
+}
+
+#undef sieve_result_global_log_error
+void sieve_result_global_log_error(const struct sieve_action_exec_env *aenv,
+				   const char *csrc_filename,
+				   unsigned int csrc_linenum,
+				   const char *fmt, ...)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_ERROR,
+		.event = aenv->event,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+	};
+	va_list args;
+
+	va_start(args, fmt);
+	sieve_global_info_logv(eenv->svinst, aenv->ehandler, &params,
+			       fmt, args);
+	va_end(args);
+}
+
+#undef sieve_result_global_log_warning
+void sieve_result_global_log_warning(const struct sieve_action_exec_env *aenv,
+				     const char *csrc_filename,
+				     unsigned int csrc_linenum,
+				     const char *fmt, ...)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_WARNING,
+		.event = aenv->event,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+	};
+	va_list args;
+
+	va_start(args, fmt);
+	sieve_global_info_logv(eenv->svinst, aenv->ehandler, &params,
+			       fmt, args);
+	va_end(args);
+}
+
+#undef sieve_result_event_log
+void sieve_result_event_log(const struct sieve_action_exec_env *aenv,
+			    const char *csrc_filename,
+			    unsigned int csrc_linenum, struct event *event,
+			    const char *fmt, ...)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct sieve_error_params params = {
+		.log_type = (HAS_ALL_BITS(eenv->flags,
+					  SIEVE_EXECUTE_FLAG_LOG_RESULT) ?
+			     LOG_TYPE_INFO : LOG_TYPE_DEBUG),
+		.event = event,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+	};
+	va_list args;
+
+	va_start(args, fmt);
+	sieve_global_logv(eenv->svinst, aenv->ehandler, &params, fmt, args);
+	va_end(args);
+}
+
+
+#undef sieve_result_critical
+void sieve_result_critical(const struct sieve_action_exec_env *aenv,
+			   const char *csrc_filename, unsigned int csrc_linenum,
+			   const char *user_prefix, const char *fmt, ...)
+{
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_ERROR,
+		.event = aenv->event,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+	};
+	va_list args;
+
+	va_start(args, fmt);
+
+	T_BEGIN {
+		sieve_criticalv(eenv->svinst, aenv->ehandler, &params,
+				user_prefix, fmt, args);
+	} T_END;
+
+	va_end(args);
+}
+
+#undef sieve_result_mail_error
+int sieve_result_mail_error(const struct sieve_action_exec_env *aenv,
+			    struct mail *mail,
+			    const char *csrc_filename,
+			    unsigned int csrc_linenum, const char *fmt, ...)
+{
+	const char *error_msg, *user_prefix;
+	va_list args;
+
+	error_msg = mailbox_get_last_internal_error(mail->box, NULL);
+
+	va_start(args, fmt);
+	user_prefix = t_strdup_vprintf(fmt, args);
+	sieve_result_critical(aenv, csrc_filename, csrc_linenum,
+			      user_prefix, "%s: %s", user_prefix, error_msg);
+	va_end(args);
+
+	return 	SIEVE_EXEC_TEMP_FAILURE;
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-result.h b/pigeonhole/src/lib-sieve/sieve-result.h
new file mode 100644
index 0000000..a9fcadc
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-result.h
@@ -0,0 +1,224 @@
+#ifndef SIEVE_RESULT_H
+#define SIEVE_RESULT_H
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+#include "sieve-execute.h"
+
+/*
+ * Types
+ */
+
+struct sieve_side_effects_list;
+
+/*
+ * Result object
+ */
+
+struct sieve_result;
+
+struct sieve_result *
+sieve_result_create(struct sieve_instance *svinst, pool_t pool,
+		    const struct sieve_execute_env *eenv);
+
+void sieve_result_ref(struct sieve_result *result);
+
+void sieve_result_unref(struct sieve_result **result);
+
+pool_t sieve_result_pool(struct sieve_result *result);
+
+/*
+ * Getters/Setters
+ */
+
+const struct sieve_script_env *
+sieve_result_get_script_env(struct sieve_result *result);
+const struct sieve_message_data *
+sieve_result_get_message_data(struct sieve_result *result);
+struct sieve_message_context *
+sieve_result_get_message_context(struct sieve_result *result);
+unsigned int sieve_result_get_exec_seq(struct sieve_result *result);
+
+/*
+ * Extension support
+ */
+
+void sieve_result_extension_set_context(struct sieve_result *result,
+					const struct sieve_extension *ext,
+					void *context);
+const void *
+sieve_result_extension_get_context(struct sieve_result *result,
+				   const struct sieve_extension *ext);
+
+/*
+ * Result printing
+ */
+
+struct sieve_result_print_env {
+	struct sieve_result *result;
+	const struct sieve_script_env *scriptenv;
+	struct ostream *stream;
+};
+
+void sieve_result_vprintf(const struct sieve_result_print_env *penv,
+			  const char *fmt, va_list args) ATTR_FORMAT(2, 0);
+void sieve_result_printf(const struct sieve_result_print_env *penv,
+			 const char *fmt, ...) ATTR_FORMAT(2, 3);
+void sieve_result_action_printf(const struct sieve_result_print_env *penv,
+				const char *fmt, ...) ATTR_FORMAT(2, 3);
+void sieve_result_seffect_printf(const struct sieve_result_print_env *penv,
+				 const char *fmt, ...) ATTR_FORMAT(2, 3);
+
+bool sieve_result_print(struct sieve_result *result,
+			const struct sieve_script_env *senv,
+			struct ostream *stream, bool *keep);
+
+/*
+ * Result composition
+ */
+
+void sieve_result_add_implicit_side_effect(
+	struct sieve_result *result, const struct sieve_action_def *to_action,
+	bool to_keep, const struct sieve_extension *ext,
+	const struct sieve_side_effect_def *seffect, void *context);
+
+int sieve_result_add_action(const struct sieve_runtime_env *renv,
+			    const struct sieve_extension *ext, const char *name,
+			    const struct sieve_action_def *act_def,
+			    struct sieve_side_effects_list *seffects,
+			    void *context, unsigned int instance_limit,
+			    bool preserve_mail);
+int sieve_result_add_keep(const struct sieve_runtime_env *renv,
+			  struct sieve_side_effects_list *seffects);
+
+void sieve_result_set_keep_action(struct sieve_result *result,
+				  const struct sieve_extension *ext,
+				  const struct sieve_action_def *act_def);
+void sieve_result_set_failure_action(struct sieve_result *result,
+				     const struct sieve_extension *ext,
+				     const struct sieve_action_def *act_def);
+
+/*
+ * Result execution
+ */
+
+struct sieve_result_execution;
+
+void sieve_result_mark_executed(struct sieve_result *result);
+
+struct sieve_result_execution *
+sieve_result_execution_create(struct sieve_result *result, pool_t pool);
+void sieve_result_execution_destroy(struct sieve_result_execution **_rexec);
+
+void *sieve_result_execution_get_dup_transaction(
+	struct sieve_result_execution *rexec);
+
+int sieve_result_execute(struct sieve_result_execution *rexec, int status,
+			 bool commit, struct sieve_error_handler *ehandler,
+			 bool *keep_r);
+
+bool sieve_result_executed(struct sieve_result_execution *rexec);
+bool sieve_result_committed(struct sieve_result_execution *rexec);
+
+bool sieve_result_executed_delivery(struct sieve_result_execution *rexec);
+
+/*
+ * Result evaluation
+ */
+
+struct sieve_result_iterate_context;
+
+struct sieve_result_iterate_context *
+sieve_result_iterate_init(struct sieve_result *result);
+const struct sieve_action *
+sieve_result_iterate_next(struct sieve_result_iterate_context *rictx,
+			  bool *keep);
+void sieve_result_iterate_delete(struct sieve_result_iterate_context *rictx);
+
+/*
+ * Side effects list
+ */
+
+struct sieve_side_effects_list *
+sieve_side_effects_list_create(struct sieve_result *result);
+void sieve_side_effects_list_add(struct sieve_side_effects_list *list,
+				 const struct sieve_side_effect *seffect);
+
+/*
+ * Error handling
+ */
+
+void sieve_result_error(const struct sieve_action_exec_env *aenv,
+			const char *csrc_filename, unsigned int csrc_linenum,
+			const char *fmt, ...)
+			ATTR_FORMAT(4, 5);
+#define sieve_result_error(aenv, ...) \
+	sieve_result_error(aenv, __FILE__, __LINE__, __VA_ARGS__)
+void sieve_result_global_error(const struct sieve_action_exec_env *aenv,
+			       const char *csrc_filename,
+			       unsigned int csrc_linenum, const char *fmt, ...)
+			       ATTR_FORMAT(4, 5);
+#define sieve_result_global_error(aenv, ...) \
+	sieve_result_global_error(aenv, __FILE__, __LINE__, __VA_ARGS__)
+void sieve_result_warning(const struct sieve_action_exec_env *aenv,
+			  const char *csrc_filename, unsigned int csrc_linenum,
+			  const char *fmt, ...)
+			  ATTR_FORMAT(4, 5);
+#define sieve_result_warning(aenv, ...) \
+	sieve_result_warning(aenv, __FILE__, __LINE__, __VA_ARGS__)
+void sieve_result_global_warning(const struct sieve_action_exec_env *aenv,
+				 const char *csrc_filename,
+				 unsigned int csrc_linenum,
+				 const char *fmt, ...)
+				 ATTR_FORMAT(4, 5);
+#define sieve_result_global_warning(aenv, ...) \
+	sieve_result_global_warning(aenv, __FILE__, __LINE__, __VA_ARGS__)
+void sieve_result_log(const struct sieve_action_exec_env *aenv,
+		      const char *csrc_filename, unsigned int csrc_linenum,
+		      const char *fmt, ...)
+		      ATTR_FORMAT(4, 5);
+#define sieve_result_log(aenv, ...) \
+	sieve_result_log(aenv, __FILE__, __LINE__, __VA_ARGS__)
+void sieve_result_global_log(const struct sieve_action_exec_env *aenv,
+			     const char *csrc_filename,
+			     unsigned int csrc_linenum, const char *fmt, ...)
+			     ATTR_FORMAT(4, 5);
+#define sieve_result_global_log(aenv, ...) \
+	sieve_result_global_log(aenv, __FILE__, __LINE__, __VA_ARGS__)
+void sieve_result_global_log_error(const struct sieve_action_exec_env *aenv,
+				   const char *csrc_filename,
+				   unsigned int csrc_linenum,
+				   const char *fmt, ...)
+				   ATTR_FORMAT(4, 5);
+#define sieve_result_global_log_error(aenv, ...) \
+	sieve_result_global_log_error(aenv, __FILE__, __LINE__, __VA_ARGS__)
+void sieve_result_global_log_warning(const struct sieve_action_exec_env *aenv,
+				     const char *csrc_filename,
+				     unsigned int csrc_linenum,
+				     const char *fmt, ...)
+				     ATTR_FORMAT(4, 5);
+#define sieve_result_global_log_warning(aenv, ...) \
+	sieve_result_global_log_warning(aenv, __FILE__, __LINE__, __VA_ARGS__)
+
+void sieve_result_event_log(const struct sieve_action_exec_env *aenv,
+			    const char *csrc_filename,
+			    unsigned int csrc_linenum, struct event *event,
+			    const char *fmt, ...) ATTR_FORMAT(5, 0);
+#define sieve_result_event_log(aenv, event, ...) \
+	sieve_result_event_log(aenv, __FILE__, __LINE__, event, __VA_ARGS__)
+
+void sieve_result_critical(const struct sieve_action_exec_env *aenv,
+			   const char *csrc_filename, unsigned int csrc_linenum,
+			   const char *user_prefix, const char *fmt, ...)
+			   ATTR_FORMAT(5, 6);
+#define sieve_result_critical(aenv, ...) \
+	sieve_result_critical(aenv, __FILE__, __LINE__, __VA_ARGS__)
+int sieve_result_mail_error(const struct sieve_action_exec_env *aenv,
+			    struct mail *mail,
+			    const char *csrc_filename,
+			    unsigned int csrc_linenum, const char *fmt, ...)
+			    ATTR_FORMAT(5, 6);
+#define sieve_result_mail_error(aenv, mail, ...) \
+	sieve_result_mail_error(aenv, mail, __FILE__, __LINE__, __VA_ARGS__)
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-runtime-trace.c b/pigeonhole/src/lib-sieve/sieve-runtime-trace.c
new file mode 100644
index 0000000..a9351a3
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-runtime-trace.c
@@ -0,0 +1,151 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "ostream.h"
+
+#include "sieve-common.h"
+#include "sieve-script.h"
+#include "sieve-binary.h"
+#include "sieve-code.h"
+#include "sieve-interpreter.h"
+#include "sieve-runtime.h"
+#include "sieve-runtime-trace.h"
+
+static inline string_t *_trace_line_new
+(const struct sieve_runtime_env *renv, sieve_size_t address, unsigned int cmd_line)
+{
+	string_t *trline;
+	unsigned int i;
+
+	trline = t_str_new(128);
+	if ( (renv->trace->config.flags & SIEVE_TRFLG_ADDRESSES) > 0 )
+		str_printfa(trline, "%08llx: ", (unsigned long long) address);
+	if ( cmd_line > 0 )
+		str_printfa(trline, "%4d: ", cmd_line);
+	else
+		str_append(trline, "      ");
+
+	for ( i = 0; i < renv->trace->indent; i++ )
+		str_append(trline, "  ");
+
+	return trline;
+}
+
+static inline void _trace_line_print
+(string_t *trline, const struct sieve_runtime_env *renv)
+{
+	sieve_trace_log_write_line(renv->trace->log, trline);
+}
+
+static inline void _trace_line_print_empty
+(const struct sieve_runtime_env *renv)
+{
+	sieve_trace_log_write_line(renv->trace->log, NULL);
+}
+
+/*
+ * Trace errors
+ */
+
+void _sieve_runtime_trace_error
+(const struct sieve_runtime_env *renv, const char *fmt, va_list args)
+{
+	string_t *trline = _trace_line_new(renv, renv->pc, 0);
+
+	str_printfa(trline, "%s: #ERROR#: ", sieve_operation_mnemonic(renv->oprtn));
+	str_vprintfa(trline, fmt, args);
+
+	_trace_line_print(trline, renv);
+}
+
+void _sieve_runtime_trace_operand_error
+(const struct sieve_runtime_env *renv, const struct sieve_operand *oprnd,
+	const char *fmt, va_list args)
+{
+	string_t *trline = _trace_line_new(renv, oprnd->address,
+		sieve_runtime_get_source_location(renv, oprnd->address));
+
+	str_printfa(trline, "%s: #ERROR#: ", sieve_operation_mnemonic(renv->oprtn));
+
+	if ( oprnd->field_name != NULL )
+		str_printfa(trline, "%s: ", oprnd->field_name);
+
+	str_vprintfa(trline, fmt, args);
+
+	_trace_line_print(trline, renv);
+}
+
+/*
+ * Trace info
+ */
+
+static inline void ATTR_FORMAT(4, 0) _sieve_runtime_trace_vprintf
+(const struct sieve_runtime_env *renv, sieve_size_t address,
+	unsigned int cmd_line, const char *fmt, va_list args)
+{
+	string_t *trline = _trace_line_new(renv, address, cmd_line);
+
+	str_vprintfa(trline, fmt, args);
+
+	_trace_line_print(trline, renv);
+}
+
+static inline void ATTR_FORMAT(4, 5) _sieve_runtime_trace_printf
+(const struct sieve_runtime_env *renv, sieve_size_t address,
+	unsigned int cmd_line, const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	_sieve_runtime_trace_vprintf(renv, address, cmd_line, fmt, args);
+	va_end(args);
+}
+
+void ATTR_FORMAT(2, 0) _sieve_runtime_trace
+(const struct sieve_runtime_env *renv, const char *fmt, va_list args)
+{
+	_sieve_runtime_trace_vprintf
+		(renv, renv->oprtn->address, sieve_runtime_get_command_location(renv),
+			fmt, args);
+}
+
+void _sieve_runtime_trace_address
+(const struct sieve_runtime_env *renv, sieve_size_t address,
+	const char *fmt, va_list args)
+{
+	_sieve_runtime_trace_vprintf
+		(renv, address, sieve_runtime_get_source_location(renv, address), fmt,
+			args);
+}
+
+/*
+ * Trace boundaries
+ */
+
+void _sieve_runtime_trace_begin(const struct sieve_runtime_env *renv)
+{
+	const char *script_name = ( renv->script != NULL ?
+		sieve_script_name(renv->script) : sieve_binary_path(renv->sbin) );
+
+	_trace_line_print_empty(renv);
+	_sieve_runtime_trace_printf(renv, renv->pc, 0,
+		"## Started executing script '%s'", script_name);
+}
+
+void _sieve_runtime_trace_end(const struct sieve_runtime_env *renv)
+{
+	const char *script_name = ( renv->script != NULL ?
+		sieve_script_name(renv->script) : sieve_binary_path(renv->sbin) );
+
+	_sieve_runtime_trace_printf(renv, renv->pc, 0,
+		"## Finished executing script '%s'", script_name);
+	_trace_line_print_empty(renv);
+}
+
+void _sieve_runtime_trace_sep(const struct sieve_runtime_env *renv)
+{
+	_trace_line_print_empty(renv);
+}
+
diff --git a/pigeonhole/src/lib-sieve/sieve-runtime-trace.h b/pigeonhole/src/lib-sieve/sieve-runtime-trace.h
new file mode 100644
index 0000000..b165586
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-runtime-trace.h
@@ -0,0 +1,182 @@
+#ifndef SIEVE_RUNTIME_TRACE_H
+#define SIEVE_RUNTIME_TRACE_H
+
+#include "sieve-common.h"
+#include "sieve-runtime.h"
+
+/*
+ * Runtime trace
+ */
+
+struct sieve_runtime_trace {
+	struct sieve_trace_config config;
+	struct sieve_trace_log *log;
+	unsigned int indent;
+};
+
+/* Trace configuration */
+
+static inline bool sieve_runtime_trace_active
+(const struct sieve_runtime_env *renv, sieve_trace_level_t trace_level)
+{
+	return ( renv->trace != NULL && trace_level <= renv->trace->config.level );
+}
+
+static inline bool sieve_runtime_trace_hasflag
+(const struct sieve_runtime_env *renv, unsigned int flag)
+{
+	return ( renv->trace != NULL && (renv->trace->config.flags & flag) != 0 );
+}
+
+/* Trace indent */
+
+static inline void sieve_runtime_trace_descend
+(const struct sieve_runtime_env *renv)
+{
+	if ( renv->trace != NULL ) renv->trace->indent++;
+}
+
+static inline void sieve_runtime_trace_ascend
+(const struct sieve_runtime_env *renv)
+{
+	if ( renv->trace != NULL ) renv->trace->indent--;
+}
+
+static inline void sieve_runtime_trace_toplevel
+(const struct sieve_runtime_env *renv)
+{
+	if ( renv->trace != NULL ) renv->trace->indent = 0;
+}
+
+/* Trace errors */
+
+void _sieve_runtime_trace_error
+	(const struct sieve_runtime_env *renv, const char *fmt, va_list args)
+		ATTR_FORMAT(2, 0);
+
+void _sieve_runtime_trace_operand_error
+	(const struct sieve_runtime_env *renv, const struct sieve_operand *oprnd,
+		const char *fmt, va_list args) ATTR_FORMAT(3, 0);
+
+static inline void sieve_runtime_trace_error
+	(const struct sieve_runtime_env *renv, const char *fmt, ...)
+		ATTR_FORMAT(2, 3);
+
+static inline void sieve_runtime_trace_operand_error
+	(const struct sieve_runtime_env *renv, const struct sieve_operand *oprnd,
+		const char *fmt, ...) ATTR_FORMAT(3, 4);
+
+static inline void ATTR_FORMAT(2, 3) sieve_runtime_trace_error
+	(const struct sieve_runtime_env *renv, const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	if ( renv->trace != NULL )
+		_sieve_runtime_trace_error(renv, fmt, args);
+	va_end(args);
+}
+
+static inline void ATTR_FORMAT(3, 4) sieve_runtime_trace_operand_error
+	(const struct sieve_runtime_env *renv, const struct sieve_operand *oprnd,
+		const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	if ( renv->trace != NULL )
+		_sieve_runtime_trace_operand_error(renv, oprnd, fmt, args);
+	va_end(args);
+}
+
+/* Trace info */
+
+void _sieve_runtime_trace
+	(const struct sieve_runtime_env *renv, const char *fmt, va_list args)
+		ATTR_FORMAT(2, 0);
+
+static inline void sieve_runtime_trace
+	(const struct sieve_runtime_env *renv, sieve_trace_level_t trace_level,
+		const char *fmt, ...) ATTR_FORMAT(3, 4);
+
+static inline void ATTR_FORMAT(3, 4) sieve_runtime_trace
+(const struct sieve_runtime_env *renv, sieve_trace_level_t trace_level,
+	const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+
+	if ( renv->trace != NULL && trace_level <= renv->trace->config.level ) {
+		_sieve_runtime_trace(renv, fmt, args);
+	}
+
+	va_end(args);
+}
+
+void _sieve_runtime_trace_address
+	(const struct sieve_runtime_env *renv, sieve_size_t address,
+		const char *fmt, va_list args) ATTR_FORMAT(3, 0);
+
+static inline void sieve_runtime_trace_address
+	(const struct sieve_runtime_env *renv, sieve_trace_level_t trace_level,
+		sieve_size_t address, const char *fmt, ...) ATTR_FORMAT(4, 5);
+
+static inline void ATTR_FORMAT(4, 5) sieve_runtime_trace_address
+(const struct sieve_runtime_env *renv, sieve_trace_level_t trace_level,
+	sieve_size_t address, const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+
+	if ( renv->trace != NULL && trace_level <= renv->trace->config.level ) {
+		_sieve_runtime_trace_address(renv, address, fmt, args);
+	}
+
+	va_end(args);
+}
+
+static inline void ATTR_FORMAT(3, 4) sieve_runtime_trace_here
+(const struct sieve_runtime_env *renv, sieve_trace_level_t trace_level,
+	const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+
+	if ( renv->trace != NULL && trace_level <= renv->trace->config.level ) {
+		_sieve_runtime_trace_address(renv, renv->pc, fmt, args);
+	}
+
+	va_end(args);
+}
+
+/* Trace boundaries */
+
+void _sieve_runtime_trace_begin(const struct sieve_runtime_env *renv);
+void _sieve_runtime_trace_end(const struct sieve_runtime_env *renv);
+void _sieve_runtime_trace_sep(const struct sieve_runtime_env *renv);
+
+static inline void sieve_runtime_trace_begin
+(const struct sieve_runtime_env *renv)
+{
+	if ( renv->trace != NULL )
+		_sieve_runtime_trace_begin(renv);
+}
+
+static inline void sieve_runtime_trace_end
+(const struct sieve_runtime_env *renv)
+{
+	if ( renv->trace != NULL )
+		_sieve_runtime_trace_end(renv);
+}
+
+static inline void sieve_runtime_trace_sep
+(const struct sieve_runtime_env *renv)
+{
+	if ( renv->trace != NULL )
+		_sieve_runtime_trace_sep(renv);
+}
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-runtime.h b/pigeonhole/src/lib-sieve/sieve-runtime.h
new file mode 100644
index 0000000..fa50602
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-runtime.h
@@ -0,0 +1,40 @@
+#ifndef SIEVE_RUNTIME_H
+#define SIEVE_RUNTIME_H
+
+#include "sieve-common.h"
+#include "sieve-execute.h"
+
+/*
+ * Runtime environment
+ */
+
+struct sieve_runtime_env {
+	const struct sieve_execute_env *exec_env;
+	struct event *event;
+
+	/* Interpreter */
+	struct sieve_interpreter *interp;
+	struct sieve_error_handler *ehandler;
+
+	/* Executing script */
+	struct sieve_script *script;
+
+	/* Executing binary */
+	struct sieve_binary *sbin;
+	struct sieve_binary_block *sblock;
+
+	/* Current code */
+	sieve_size_t pc;
+	const struct sieve_operation *oprtn;
+
+	/* Tested message */
+	struct sieve_message_context *msgctx;
+
+	/* Filter result */
+	struct sieve_result *result;
+
+	/* Runtime tracing */
+	struct sieve_runtime_trace *trace;
+};
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-script-private.h b/pigeonhole/src/lib-sieve/sieve-script-private.h
new file mode 100644
index 0000000..7f23c19
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-script-private.h
@@ -0,0 +1,100 @@
+#ifndef SIEVE_SCRIPT_PRIVATE_H
+#define SIEVE_SCRIPT_PRIVATE_H
+
+#include "sieve-common.h"
+#include "sieve-script.h"
+
+/*
+ * Script object
+ */
+
+struct sieve_script_vfuncs {
+	void (*destroy)(struct sieve_script *script);
+
+	int (*open)(struct sieve_script *script, enum sieve_error *error_r);
+
+	int (*get_stream)(struct sieve_script *script,
+			  struct istream **stream_r, enum sieve_error *error_r);
+
+	/* binary */
+	int (*binary_read_metadata)(struct sieve_script *_script,
+				    struct sieve_binary_block *sblock,
+				    sieve_size_t *offset);
+	void (*binary_write_metadata)(struct sieve_script *script,
+				      struct sieve_binary_block *sblock);
+	bool (*binary_dump_metadata)(struct sieve_script *script,
+				     struct sieve_dumptime_env *denv,
+				     struct sieve_binary_block *sblock,
+				     sieve_size_t *offset);
+	struct sieve_binary *(*binary_load)(struct sieve_script *script,
+					    enum sieve_error *error_r);
+	int (*binary_save)(struct sieve_script *script,
+			   struct sieve_binary *sbin, bool update,
+			   enum sieve_error *error_r);
+	const char *(*binary_get_prefix)(struct sieve_script *script);
+
+	/* management */
+	int (*rename)(struct sieve_script *script, const char *newname);
+	int (*delete)(struct sieve_script *script);
+	int (*is_active)(struct sieve_script *script);
+	int (*activate)(struct sieve_script *script);
+
+	/* properties */
+	int (*get_size)(const struct sieve_script *script, uoff_t *size_r);
+
+	/* matching */
+	bool (*equals)(const struct sieve_script *script,
+		       const struct sieve_script *other);
+};
+
+struct sieve_script {
+	pool_t pool;
+	unsigned int refcount;
+	struct sieve_storage *storage;
+	struct event *event;
+
+	const char *driver_name;
+	const struct sieve_script *script_class;
+	struct sieve_script_vfuncs v;
+
+	const char *name;
+	const char *location;
+
+	/* Stream */
+	struct istream *stream;
+
+	bool open:1;
+};
+
+void sieve_script_init(struct sieve_script *script,
+		       struct sieve_storage *storage,
+		       const struct sieve_script *script_class,
+		       const char *location, const char *name);
+
+/*
+ * Built-in script drivers
+ */
+
+extern const struct sieve_script sieve_data_script;
+extern const struct sieve_script sieve_file_script;
+extern const struct sieve_script sieve_dict_script;
+extern const struct sieve_script sieve_ldap_script;
+
+/*
+ * Error handling
+ */
+
+void sieve_script_set_error(struct sieve_script *script, enum sieve_error error,
+			    const char *fmt, ...) ATTR_FORMAT(3, 4);
+void sieve_script_set_internal_error(struct sieve_script *script);
+void sieve_script_set_critical(struct sieve_script *script,
+			       const char *fmt, ...) ATTR_FORMAT(2, 3);
+
+/*
+ * Script sequence
+ */
+
+void sieve_script_sequence_init(struct sieve_script_sequence *seq,
+				struct sieve_storage *storage);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-script.c b/pigeonhole/src/lib-sieve/sieve-script.c
new file mode 100644
index 0000000..32963a0
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-script.c
@@ -0,0 +1,906 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "compat.h"
+#include "unichar.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "hash.h"
+#include "array.h"
+#include "eacces-error.h"
+#include "istream.h"
+
+#include "sieve-common.h"
+#include "sieve-limits.h"
+#include "sieve-settings.h"
+#include "sieve-error.h"
+#include "sieve-dump.h"
+#include "sieve-binary.h"
+
+#include "sieve-storage-private.h"
+#include "sieve-script-private.h"
+
+/*
+ * Script name
+ */
+
+bool sieve_script_name_is_valid(const char *scriptname)
+{
+	ARRAY_TYPE(unichars) uni_name;
+	unsigned int count, i;
+	const unichar_t *name_chars;
+	size_t namelen = strlen(scriptname);
+
+	/* Check minimum length */
+	if (namelen == 0)
+		return FALSE;
+
+	/* Check worst-case maximum length */
+	if (namelen > SIEVE_MAX_SCRIPT_NAME_LEN * 4)
+		return FALSE;
+
+	/* Intialize array for unicode characters */
+	t_array_init(&uni_name, namelen * 4);
+
+	/* Convert UTF-8 to UCS4/UTF-32 */
+	if (uni_utf8_to_ucs4(scriptname, &uni_name) < 0)
+		return FALSE;
+	name_chars = array_get(&uni_name, &count);
+
+	/* Check true maximum length */
+	if (count > SIEVE_MAX_SCRIPT_NAME_LEN)
+		return FALSE;
+
+	/* Scan name for invalid characters
+	 *   FIXME: compliance with Net-Unicode Definition (Section 2 of
+	 *          RFC 5198) is not checked fully and no normalization
+	 *          is performed.
+	 */
+	for (i = 0; i < count; i++) {
+		/* 0000-001F; [CONTROL CHARACTERS] */
+		if (name_chars[i] <= 0x001f)
+			return FALSE;
+		/* 002F; SLASH (not RFC-prohibited, but '/' is dangerous) */
+		if (name_chars[i] == 0x002f)
+			return FALSE;
+		/* 007F; DELETE */
+		if (name_chars[i] == 0x007f)
+			return FALSE;
+		/* 0080-009F; [CONTROL CHARACTERS] */
+		if (name_chars[i] >= 0x0080 && name_chars[i] <= 0x009f)
+			return FALSE;
+		/* 00FF */
+		if (name_chars[i] == 0x00ff)
+			return FALSE;
+		/* 2028; LINE SEPARATOR */
+		/* 2029; PARAGRAPH SEPARATOR */
+		if (name_chars[i] == 0x2028 || name_chars[i] == 0x2029)
+			return FALSE;
+	}
+
+	return TRUE;
+}
+
+/*
+ * Script instance
+ */
+
+void sieve_script_init(struct sieve_script *script,
+		       struct sieve_storage *storage,
+		       const struct sieve_script *script_class,
+		       const char *location, const char *name)
+{
+	i_assert(storage != NULL);
+
+	script->script_class = script_class;
+	script->refcount = 1;
+	script->storage = storage;
+	script->location = p_strdup_empty(script->pool, location);
+	script->name = p_strdup(script->pool, name);
+
+	script->event = event_create(storage->event);
+	event_add_str(script->event, "script_name", name);
+	event_add_str(script->event, "script_location", location);
+	if (name == NULL)
+		event_set_append_log_prefix(script->event, "script: ");
+	else {
+		event_set_append_log_prefix(
+			script->event, t_strdup_printf("script `%s': ", name));
+	}
+
+	sieve_storage_ref(storage);
+}
+
+struct sieve_script *
+sieve_script_create(struct sieve_instance *svinst, const char *location,
+		    const char *name, enum sieve_error *error_r)
+{
+	struct sieve_storage *storage;
+	struct sieve_script *script;
+	enum sieve_error error;
+
+	if (error_r != NULL)
+		*error_r = SIEVE_ERROR_NONE;
+	else
+		error_r = &error;
+
+	storage = sieve_storage_create(svinst, location, 0, error_r);
+	if (storage == NULL)
+		return NULL;
+
+	script = sieve_storage_get_script(storage, name, error_r);
+
+	sieve_storage_unref(&storage);
+	return script;
+}
+
+void sieve_script_ref(struct sieve_script *script)
+{
+	script->refcount++;
+}
+
+void sieve_script_unref(struct sieve_script **_script)
+{
+	struct sieve_script *script = *_script;
+
+	*_script = NULL;
+
+	if (script == NULL)
+		return;
+
+	i_assert(script->refcount > 0);
+	if (--script->refcount != 0)
+		return;
+
+	if (script->stream != NULL) {
+		struct event_passthrough *e =
+			event_create_passthrough(script->event)->
+			set_name("sieve_script_closed");
+		e_debug(e->event(), "Closed script");
+	}
+	i_stream_unref(&script->stream);
+
+	if (script->v.destroy != NULL)
+		script->v.destroy(script);
+
+	sieve_storage_unref(&script->storage);
+	event_unref(&script->event);
+	pool_unref(&script->pool);
+}
+
+int sieve_script_open(struct sieve_script *script, enum sieve_error *error_r)
+{
+	enum sieve_error error;
+
+	if (error_r != NULL)
+		*error_r = SIEVE_ERROR_NONE;
+	else
+		error_r = &error;
+
+	if (script->open)
+		return 0;
+
+	if (script->v.open(script, error_r) < 0)
+		return -1;
+
+	i_assert(script->location != NULL);
+	i_assert(script->name != NULL);
+	script->open = TRUE;
+
+	if (*script->name != '\0') {
+		e_debug(script->event, "Opened script `%s' from `%s'",
+			script->name, script->location);
+	} else {
+		e_debug(script->event, "Opened nameless script from `%s'",
+			script->location);
+	}
+	return 0;
+}
+
+int sieve_script_open_as(struct sieve_script *script, const char *name,
+			 enum sieve_error *error_r)
+{
+	if (sieve_script_open(script, error_r) < 0)
+		return -1;
+
+	/* override name */
+	script->name = p_strdup(script->pool, name);
+	event_add_str(script->event, "script_name", name);
+	return 0;
+}
+
+struct sieve_script *
+sieve_script_create_open(struct sieve_instance *svinst, const char *location,
+			 const char *name, enum sieve_error *error_r)
+{
+	struct sieve_script *script;
+
+	script = sieve_script_create(svinst, location, name, error_r);
+	if (script == NULL)
+		return NULL;
+
+	if (sieve_script_open(script, error_r) < 0) {
+		sieve_script_unref(&script);
+		return NULL;
+	}
+
+	return script;
+}
+
+int sieve_script_check(struct sieve_instance *svinst, const char *location,
+		       const char *name, enum sieve_error *error_r)
+{
+	struct sieve_script *script;
+	enum sieve_error error;
+
+	if (error_r == NULL)
+		error_r = &error;
+
+	script = sieve_script_create_open(svinst, location, name, error_r);
+	if (script == NULL)
+		return (*error_r == SIEVE_ERROR_NOT_FOUND ? 0 : -1);
+
+	sieve_script_unref(&script);
+	return 1;
+}
+
+/*
+ * Properties
+ */
+
+const char *sieve_script_name(const struct sieve_script *script)
+{
+	return script->name;
+}
+
+const char *sieve_script_location(const struct sieve_script *script)
+{
+	return script->location;
+}
+
+struct sieve_instance *sieve_script_svinst(const struct sieve_script *script)
+{
+	return script->storage->svinst;
+}
+
+int sieve_script_get_size(struct sieve_script *script, uoff_t *size_r)
+{
+	struct istream *stream;
+	int ret;
+
+	if (script->v.get_size != NULL) {
+		if ((ret = script->v.get_size(script, size_r)) != 0)
+			return ret;
+	}
+
+	/* Try getting size from the stream */
+	if (script->stream == NULL &&
+	    sieve_script_get_stream(script, &stream, NULL) < 0)
+		return -1;
+
+	if (i_stream_get_size(script->stream, TRUE, size_r) < 0) {
+		sieve_storage_set_critical(script->storage,
+			"i_stream_get_size(%s) failed: %s",
+			i_stream_get_name(script->stream),
+			i_stream_get_error(script->stream));
+		return -1;
+	}
+	return 0;
+}
+
+bool sieve_script_is_open(const struct sieve_script *script)
+{
+	return script->open;
+}
+
+bool sieve_script_is_default(const struct sieve_script *script)
+{
+	return script->storage->is_default;
+}
+
+/*
+ * Stream management
+ */
+
+int sieve_script_get_stream(struct sieve_script *script,
+			    struct istream **stream_r,
+			    enum sieve_error *error_r)
+{
+	struct sieve_storage *storage = script->storage;
+	enum sieve_error error;
+	int ret;
+
+	if (error_r != NULL)
+		*error_r = SIEVE_ERROR_NONE;
+	else
+		error_r = &error;
+
+	if (script->stream != NULL) {
+		*stream_r = script->stream;
+		return 0;
+	}
+
+	// FIXME: necessary?
+	i_assert(script->open);
+
+	T_BEGIN {
+		ret = script->v.get_stream(script, &script->stream, error_r);
+	} T_END;
+
+	if (ret < 0) {
+		struct event_passthrough *e =
+			event_create_passthrough(script->event)->
+			add_str("error", storage->error)->
+			set_name("sieve_script_opened");
+		e_debug(e->event(), "Failed to open script for reading: %s",
+			storage->error);
+		return -1;
+	}
+
+	struct event_passthrough *e =
+		event_create_passthrough(script->event)->
+		set_name("sieve_script_opened");
+	e_debug(e->event(), "Opened script for reading");
+
+	*stream_r = script->stream;
+	return 0;
+}
+
+/*
+ * Comparison
+ */
+
+bool sieve_script_equals(const struct sieve_script *script,
+			 const struct sieve_script *other)
+{
+	if (script == other)
+		return TRUE;
+	if (script == NULL || other == NULL)
+		return FALSE;
+	if (script->script_class != other->script_class)
+		return FALSE;
+
+	if (script->v.equals == NULL) {
+		i_assert (script->location != NULL && other->location != NULL);
+
+		return (strcmp(script->location, other->location) == 0);
+	}
+
+	return script->v.equals(script, other);
+}
+
+unsigned int sieve_script_hash(const struct sieve_script *script)
+{
+	i_assert(script->name != NULL);
+
+	return str_hash(script->name);
+}
+
+/*
+ * Binary
+ */
+
+int sieve_script_binary_read_metadata(struct sieve_script *script,
+				      struct sieve_binary_block *sblock,
+				      sieve_size_t *offset)
+{
+	struct sieve_binary *sbin = sieve_binary_block_get_binary(sblock);
+	string_t *storage_class, *location;
+	unsigned int version;
+
+	if ((sieve_binary_block_get_size(sblock) - *offset) == 0)
+		return 0;
+
+	/* storage class */
+	if (!sieve_binary_read_string(sblock, offset, &storage_class)) {
+		e_error(script->event,
+			"Binary `%s' has invalid metadata for script `%s': "
+			"Invalid storage class",
+			sieve_binary_path(sbin), script->location);
+		return -1;
+	}
+	if (strcmp(str_c(storage_class), script->driver_name) != 0) {
+		e_debug(script->event,
+			"Binary `%s' reports unexpected driver name for script `%s' "
+			"(`%s' rather than `%s')",
+			sieve_binary_path(sbin), script->location,
+			str_c(storage_class), script->driver_name);
+		return 0;
+	}
+
+	/* version */
+	if (!sieve_binary_read_unsigned(sblock, offset, &version)) {
+		e_error(script->event,
+			"Binary `%s' has invalid metadata for script `%s': "
+			"Invalid version",
+			sieve_binary_path(sbin), script->location);
+		return -1;
+	}
+	if (script->storage->version != version) {
+		e_debug(script->event,
+			"Binary `%s' was compiled with "
+			"a different version of the `%s' script storage class "
+			"(compiled v%d, expected v%d; "
+				"automatically fixed when re-compiled)",
+			sieve_binary_path(sbin), script->driver_name,
+		 	version, script->storage->version);
+		return 0;
+	}
+
+	/* location */
+	if (!sieve_binary_read_string(sblock, offset, &location)) {
+		e_error(script->event,
+			"Binary `%s' has invalid metadata for script `%s': "
+			"Invalid location",
+			sieve_binary_path(sbin), script->location);
+		return -1;
+	}
+	i_assert(script->location != NULL);
+	if (strcmp(str_c(location), script->location) != 0) {
+		e_debug(script->event,
+			"Binary `%s' reports different location "
+			"for script `%s' (binary points to `%s')",
+			sieve_binary_path(sbin), script->location,
+			str_c(location));
+		return 0;
+	}
+
+	if (script->v.binary_read_metadata == NULL)
+		return 1;
+
+	return script->v.binary_read_metadata(script, sblock, offset);
+}
+
+void sieve_script_binary_write_metadata(struct sieve_script *script,
+					struct sieve_binary_block *sblock)
+{
+	sieve_binary_emit_cstring(sblock, script->driver_name);
+	sieve_binary_emit_unsigned(sblock, script->storage->version);
+	sieve_binary_emit_cstring(sblock, (script->location == NULL ?
+					   "" : script->location));
+
+	if (script->v.binary_write_metadata == NULL)
+		return;
+
+	script->v.binary_write_metadata(script, sblock);
+}
+
+bool sieve_script_binary_dump_metadata(struct sieve_script *script,
+				       struct sieve_dumptime_env *denv,
+				       struct sieve_binary_block *sblock,
+				       sieve_size_t *offset)
+{
+	struct sieve_binary *sbin = sieve_binary_block_get_binary(sblock);
+	struct sieve_instance *svinst = sieve_binary_svinst(sbin);
+	string_t *storage_class, *location;
+	struct sieve_script *adhoc_script = NULL;
+	unsigned int version;
+	bool result = TRUE;
+
+	/* storage class */
+	if (!sieve_binary_read_string(sblock, offset, &storage_class))
+		return FALSE;
+	sieve_binary_dumpf(denv, "class = %s\n", str_c(storage_class));
+
+	/* version */
+	if (!sieve_binary_read_unsigned(sblock, offset, &version))
+		return FALSE;
+	sieve_binary_dumpf(denv, "class.version = %d\n", version);
+
+	/* location */
+	if (!sieve_binary_read_string(sblock, offset, &location))
+		return FALSE;
+	sieve_binary_dumpf(denv, "location = %s\n", str_c(location));
+
+	if (script == NULL) {
+		script = adhoc_script =
+			sieve_script_create(svinst, str_c(location),
+					    NULL, NULL);
+	}
+
+	if (script != NULL && script->v.binary_dump_metadata != NULL) {
+		result = script->v.binary_dump_metadata(
+			script, denv, sblock, offset);
+	}
+
+	if (adhoc_script != NULL)
+		sieve_script_unref(&adhoc_script);
+	return result;
+}
+
+struct sieve_binary *
+sieve_script_binary_load(struct sieve_script *script, enum sieve_error *error_r)
+{
+	if (script->v.binary_load == NULL) {
+		*error_r = SIEVE_ERROR_NOT_POSSIBLE;
+		return NULL;
+	}
+
+	return script->v.binary_load(script, error_r);
+}
+
+int sieve_script_binary_save(struct sieve_script *script,
+			     struct sieve_binary *sbin, bool update,
+			     enum sieve_error *error_r)
+{
+	struct sieve_script *bin_script = sieve_binary_script(sbin);
+	enum sieve_error error;
+
+	if (error_r != NULL)
+		*error_r = SIEVE_ERROR_NONE;
+	else
+		error_r = &error;
+
+	i_assert(bin_script == NULL || sieve_script_equals(bin_script, script));
+
+	if (script->v.binary_save == NULL) {
+		*error_r = SIEVE_ERROR_NOT_POSSIBLE;
+		return -1;
+	}
+
+	return script->v.binary_save(script, sbin, update, error_r);
+}
+
+const char *sieve_script_binary_get_prefix(struct sieve_script *script)
+{
+	struct sieve_storage *storage = script->storage;
+
+	if (storage->bin_dir != NULL &&
+	    sieve_storage_setup_bindir(storage, 0700) >= 0) {
+		return t_strconcat(storage->bin_dir, "/", script->name, NULL);
+	}
+
+	if (script->v.binary_get_prefix == NULL)
+		return NULL;
+
+	return script->v.binary_get_prefix(script);
+}
+
+/*
+ * Management
+ */
+
+static int
+sieve_script_copy_from_default(struct sieve_script *script, const char *newname)
+{
+	struct sieve_storage *storage = script->storage;
+	struct istream *input;
+	int ret;
+
+	/* copy from default */
+	if ((ret = sieve_script_open(script, NULL)) < 0 ||
+	    (ret = sieve_script_get_stream(script, &input, NULL)) < 0) {
+		sieve_storage_copy_error(storage->default_for, storage);
+		return ret;
+	}
+
+	ret = sieve_storage_save_as(storage->default_for, input, newname);
+	if (ret < 0) {
+		sieve_storage_copy_error(storage, storage->default_for);
+	} else if (sieve_script_is_active(script) > 0) {
+		struct sieve_script *newscript;
+		enum sieve_error error;
+
+		newscript = sieve_storage_open_script(storage->default_for,
+						      newname, &error);
+		if (newscript == NULL) {
+			/* Somehow not actually saved */
+			ret = (error == SIEVE_ERROR_NOT_FOUND ? 0 : -1);
+		} else if (sieve_script_activate(newscript, (time_t)-1) < 0) {
+			/* Failed to activate; roll back */
+			ret = -1;
+			(void)sieve_script_delete(newscript, TRUE);
+		}
+		if (newscript != NULL)
+			sieve_script_unref(&newscript);
+
+		if (ret < 0) {
+			e_error(storage->event,
+				"Failed to implicitly activate script `%s' "
+				"after rename",	newname);
+			sieve_storage_copy_error(storage->default_for, storage);
+		}
+	}
+
+	return ret;
+}
+
+int sieve_script_rename(struct sieve_script *script, const char *newname)
+{
+	struct sieve_storage *storage = script->storage;
+	const char *oldname = script->name;
+	struct event_passthrough *event;
+	int ret;
+
+	i_assert(newname != NULL);
+
+	/* Check script name */
+	if (!sieve_script_name_is_valid(newname)) {
+		sieve_script_set_error(script,
+			SIEVE_ERROR_BAD_PARAMS,
+			"Invalid new Sieve script name `%s'.",
+			str_sanitize(newname, 80));
+		return -1;
+	}
+
+	i_assert(script->open); // FIXME: auto-open?
+
+	if (storage->default_for == NULL) {
+		i_assert((storage->flags & SIEVE_STORAGE_FLAG_READWRITE) != 0);
+
+		/* rename script */
+		i_assert(script->v.rename != NULL);
+		ret = script->v.rename(script, newname);
+
+		/* rename INBOX mailbox attribute */
+		if (ret >= 0 && oldname != NULL) {
+			(void)sieve_storage_sync_script_rename(storage, oldname,
+							       newname);
+		}
+	} else if (sieve_storage_check_script(storage->default_for,
+					      newname, NULL) > 0) {
+		sieve_script_set_error(script, SIEVE_ERROR_EXISTS,
+			"A sieve script with that name already exists.");
+		sieve_storage_copy_error(storage->default_for, storage);
+		ret = -1;
+	} else {
+		ret = sieve_script_copy_from_default(script, newname);
+	}
+
+	event = event_create_passthrough(script->event)->
+		clear_field("script_name")->
+		add_str("old_script_name", script->name)->
+		add_str("new_script_name", newname)->
+		set_name("sieve_script_renamed");
+
+	if (ret >= 0) {
+		e_debug(event->event(), "Script renamed to `%s'", newname);
+	} else {
+		event = event->add_str("error", storage->error);
+
+		e_debug(event->event(), "Failed to rename script: %s",
+			storage->error);
+	}
+
+	return ret;
+}
+
+int sieve_script_delete(struct sieve_script *script, bool ignore_active)
+{
+	struct sieve_storage *storage = script->storage;
+	bool is_active = FALSE;
+	int ret = 0;
+
+	i_assert(script->open); // FIXME: auto-open?
+
+	/* Is the requested script active? */
+	if (sieve_script_is_active(script) > 0) {
+		is_active = TRUE;
+		if (!ignore_active) {
+			sieve_script_set_error(script, SIEVE_ERROR_ACTIVE,
+				"Cannot delete the active Sieve script.");
+			if (storage->default_for != NULL) {
+				sieve_storage_copy_error(storage->default_for,
+							 storage);
+			}
+			return -1;
+		}
+	}
+
+	/* Trying to delete the default script? */
+	if (storage->is_default) {
+		/* ignore */
+		return 0;
+	}
+
+	i_assert((script->storage->flags & SIEVE_STORAGE_FLAG_READWRITE) != 0);
+
+	/* Deactivate it explicity */
+	if (ignore_active && is_active)
+		(void)sieve_storage_deactivate(storage, (time_t)-1);
+
+	i_assert(script->v.delete != NULL);
+	ret = script->v.delete(script);
+
+	if (ret >= 0) {
+		struct event_passthrough *e =
+			event_create_passthrough(script->event)->
+			set_name("sieve_script_deleted");
+		e_debug(e->event(), "Script deleted");
+
+		/* unset INBOX mailbox attribute */
+		(void)sieve_storage_sync_script_delete(storage, script->name);
+	} else {
+		struct event_passthrough *e =
+			event_create_passthrough(script->event)->
+			add_str("error", storage->error)->
+			set_name("sieve_script_deleted");
+		e_debug(e->event(), "Failed to delete script: %s",
+			storage->error);
+	}
+	return ret;
+}
+
+int sieve_script_is_active(struct sieve_script *script)
+{
+	struct sieve_storage *storage = script->storage;
+
+	/* Special handling if this is a default script */
+	if (storage->default_for != NULL) {
+		int ret = sieve_storage_active_script_is_default(
+			storage->default_for);
+		if (ret < 0)
+			sieve_storage_copy_error(storage, storage->default_for);
+		return ret;
+	}
+
+	if (script->v.is_active == NULL)
+		return 0;
+	return script->v.is_active(script);
+}
+
+int sieve_script_activate(struct sieve_script *script, time_t mtime)
+{
+	struct sieve_storage *storage = script->storage;
+	int ret = 0;
+
+	i_assert(script->open); // FIXME: auto-open?
+
+	if (storage->default_for == NULL) {
+		i_assert((storage->flags & SIEVE_STORAGE_FLAG_READWRITE) != 0);
+
+		i_assert(script->v.activate != NULL);
+		ret = script->v.activate(script);
+
+		if (ret >= 0) {
+			struct event_passthrough *e =
+				event_create_passthrough(script->event)->
+				set_name("sieve_script_activated");
+			e_debug(e->event(), "Script activated");
+
+			sieve_storage_set_modified(storage, mtime);
+			(void)sieve_storage_sync_script_activate(storage);
+		} else {
+			struct event_passthrough *e =
+				event_create_passthrough(script->event)->
+				add_str("error", storage->error)->
+				set_name("sieve_script_activated");
+			e_debug(e->event(), "Failed to activate script: %s",
+				storage->error);
+		}
+
+	} else {
+		/* Activating the default script is equal to deactivating
+		   the storage */
+		ret = sieve_storage_deactivate(storage->default_for,
+					       (time_t)-1);
+		if (ret < 0)
+			sieve_storage_copy_error(storage, storage->default_for);
+	}
+
+	return ret;
+}
+
+/*
+ * Error handling
+ */
+
+void sieve_script_set_error(struct sieve_script *script, enum sieve_error error,
+			    const char *fmt, ...)
+{
+	struct sieve_storage *storage = script->storage;
+	va_list va;
+
+	sieve_storage_clear_error(storage);
+
+	if (fmt != NULL) {
+		va_start(va, fmt);
+		storage->error = i_strdup_vprintf(fmt, va);
+		va_end(va);
+	}
+	storage->error_code = error;
+}
+
+void sieve_script_set_internal_error(struct sieve_script *script)
+{
+	sieve_storage_set_internal_error(script->storage);
+}
+
+void sieve_script_set_critical(struct sieve_script *script,
+			       const char *fmt, ...)
+{
+	struct sieve_storage *storage = script->storage;
+
+	va_list va;
+
+	if (fmt != NULL) {
+		if ((storage->flags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) == 0) {
+			va_start(va, fmt);
+			e_error(script->event, "%s", t_strdup_vprintf(fmt, va));
+			va_end(va);
+
+			sieve_storage_set_internal_error(storage);
+
+		} else {
+			sieve_storage_clear_error(storage);
+
+			/* no user is involved while synchronizing, so do it the
+			   normal way */
+			va_start(va, fmt);
+			storage->error = i_strdup_vprintf(fmt, va);
+			va_end(va);
+
+			storage->error_code = SIEVE_ERROR_TEMP_FAILURE;
+		}
+	}
+}
+
+const char *
+sieve_script_get_last_error(struct sieve_script *script,
+			    enum sieve_error *error_r)
+{
+	return sieve_storage_get_last_error(script->storage, error_r);
+}
+
+const char *sieve_script_get_last_error_lcase(struct sieve_script *script)
+{
+	return sieve_error_from_external(script->storage->error);
+}
+
+/*
+ * Script sequence
+ */
+
+void sieve_script_sequence_init(struct sieve_script_sequence *seq,
+				struct sieve_storage *storage)
+{
+	seq->storage = storage;
+	sieve_storage_ref(storage);
+}
+
+struct sieve_script_sequence *
+sieve_script_sequence_create(struct sieve_instance *svinst,
+			     const char *location, enum sieve_error *error_r)
+{
+	struct sieve_storage *storage;
+	struct sieve_script_sequence *seq;
+	enum sieve_error error;
+
+	if (error_r != NULL)
+		*error_r = SIEVE_ERROR_NONE;
+	else
+		error_r = &error;
+
+	storage = sieve_storage_create(svinst, location, 0, error_r);
+	if (storage == NULL)
+		return NULL;
+
+	seq = sieve_storage_get_script_sequence(storage, error_r);
+
+	sieve_storage_unref(&storage);
+	return seq;
+}
+
+struct sieve_script *
+sieve_script_sequence_next(struct sieve_script_sequence *seq,
+			   enum sieve_error *error_r)
+{
+	struct sieve_storage *storage = seq->storage;
+
+	i_assert(storage->v.script_sequence_next != NULL);
+	return storage->v.script_sequence_next(seq, error_r);
+}
+
+void sieve_script_sequence_free(struct sieve_script_sequence **_seq)
+{
+	struct sieve_script_sequence *seq = *_seq;
+	struct sieve_storage *storage = seq->storage;
+
+	if (storage->v.script_sequence_destroy != NULL)
+		storage->v.script_sequence_destroy(seq);
+
+	sieve_storage_unref(&storage);
+	*_seq = NULL;
+}
+
diff --git a/pigeonhole/src/lib-sieve/sieve-script.h b/pigeonhole/src/lib-sieve/sieve-script.h
new file mode 100644
index 0000000..8ee53f4
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-script.h
@@ -0,0 +1,163 @@
+#ifndef SIEVE_SCRIPT_H
+#define SIEVE_SCRIPT_H
+
+#include "sieve-common.h"
+
+#include <sys/types.h>
+
+
+/*
+ * Sieve script name
+ */
+
+bool sieve_script_name_is_valid(const char *scriptname);
+
+/*
+ * Sieve script file
+ */
+
+bool sieve_script_file_has_extension(const char *filename);
+
+/*
+ * Sieve script class
+ */
+
+void sieve_script_class_register(struct sieve_instance *svinst,
+				 const struct sieve_script *script_class);
+void sieve_script_class_unregister(struct sieve_instance *svinst,
+				   const struct sieve_script *script_class);
+
+/*
+ * Sieve script instance
+ */
+
+struct sieve_script;
+
+ARRAY_DEFINE_TYPE(sieve_script, struct sieve_script *);
+
+struct sieve_script *
+sieve_script_create(struct sieve_instance *svinst, const char *location,
+		    const char *name, enum sieve_error *error_r) ATTR_NULL(3,4);
+
+void sieve_script_ref(struct sieve_script *script);
+void sieve_script_unref(struct sieve_script **script);
+
+int sieve_script_open(struct sieve_script *script, enum sieve_error *error_r)
+		      ATTR_NULL(2);
+int sieve_script_open_as(struct sieve_script *script, const char *name,
+			 enum sieve_error *error_r) ATTR_NULL(3);
+
+struct sieve_script *
+sieve_script_create_open(struct sieve_instance *svinst, const char *location,
+			 const char *name, enum sieve_error *error_r)
+			 ATTR_NULL(3, 4);
+int sieve_script_check(struct sieve_instance *svinst, const char *location,
+		       const char *name, enum sieve_error *error_r)
+		       ATTR_NULL(3, 4);
+
+/*
+ * Data script
+ */
+
+struct sieve_script *
+sieve_data_script_create_from_input(struct sieve_instance *svinst,
+				    const char *name, struct istream *input);
+
+/*
+ * Binary
+ */
+
+int sieve_script_binary_read_metadata(struct sieve_script *script,
+				      struct sieve_binary_block *sblock,
+				      sieve_size_t *offset);
+void sieve_script_binary_write_metadata(struct sieve_script *script,
+					struct sieve_binary_block *sblock);
+bool sieve_script_binary_dump_metadata(struct sieve_script *script,
+				       struct sieve_dumptime_env *denv,
+				       struct sieve_binary_block *sblock,
+				       sieve_size_t *offset) ATTR_NULL(1);
+
+struct sieve_binary *
+sieve_script_binary_load(struct sieve_script *script,
+			 enum sieve_error *error_r);
+int sieve_script_binary_save(struct sieve_script *script,
+			     struct sieve_binary *sbin, bool update,
+			     enum sieve_error *error_r) ATTR_NULL(4);
+
+const char *sieve_script_binary_get_prefix(struct sieve_script *script);
+
+/*
+ * Stream management
+ */
+
+int sieve_script_get_stream(struct sieve_script *script,
+			    struct istream **stream_r,
+			    enum sieve_error *error_r) ATTR_NULL(3);
+
+/*
+ * Management
+ */
+
+// FIXME: check read/write flag!
+
+int sieve_script_rename(struct sieve_script *script, const char *newname);
+int sieve_script_is_active(struct sieve_script *script);
+int sieve_script_activate(struct sieve_script *script, time_t mtime);
+int sieve_script_delete(struct sieve_script *script, bool ignore_active);
+
+/*
+ * Properties
+ */
+
+const char *sieve_script_name(const struct sieve_script *script) ATTR_PURE;
+const char *sieve_script_location(const struct sieve_script *script) ATTR_PURE;
+struct sieve_instance *
+sieve_script_svinst(const struct sieve_script *script) ATTR_PURE;
+
+int sieve_script_get_size(struct sieve_script *script, uoff_t *size_r);
+bool sieve_script_is_open(const struct sieve_script *script) ATTR_PURE;
+bool sieve_script_is_default(const struct sieve_script *script) ATTR_PURE;
+
+const char *
+sieve_file_script_get_dirpath(const struct sieve_script *script) ATTR_PURE;
+const char *
+sieve_file_script_get_path(const struct sieve_script *script) ATTR_PURE;
+
+/*
+ * Comparison
+ */
+
+bool sieve_script_equals(const struct sieve_script *script,
+			 const struct sieve_script *other);
+
+unsigned int sieve_script_hash(const struct sieve_script *script);
+static inline int
+sieve_script_cmp(const struct sieve_script *script,
+		 const struct sieve_script *other)
+{
+	return ( sieve_script_equals(script, other) ? 0 : -1 );
+}
+
+/*
+ * Error handling
+ */
+
+const char *sieve_script_get_last_error(struct sieve_script *script,
+					enum sieve_error *error_r) ATTR_NULL(2);
+const char *sieve_script_get_last_error_lcase(struct sieve_script *script);
+
+/*
+ * Script sequence
+ */
+
+struct sieve_script_sequence;
+
+struct sieve_script_sequence *
+sieve_script_sequence_create(struct sieve_instance *svinst,
+			     const char *location, enum sieve_error *error_r);
+struct sieve_script *
+sieve_script_sequence_next(struct sieve_script_sequence *seq,
+			   enum sieve_error *error_r);
+void sieve_script_sequence_free(struct sieve_script_sequence **_seq);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-settings.c b/pigeonhole/src/lib-sieve/sieve-settings.c
new file mode 100644
index 0000000..47f70da
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-settings.c
@@ -0,0 +1,270 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+
+#include "sieve-common.h"
+#include "sieve-limits.h"
+#include "sieve-error.h"
+#include "sieve-address.h"
+#include "sieve-address-source.h"
+#include "sieve-settings.h"
+
+#include <ctype.h>
+
+/*
+ * Access to settings
+ */
+
+bool sieve_setting_get_uint_value(struct sieve_instance *svinst,
+				  const char *setting,
+				  unsigned long long int *value_r)
+{
+	const char *str_value;
+
+	str_value = sieve_setting_get(svinst, setting);
+
+	if (str_value == NULL || *str_value == '\0')
+		return FALSE;
+
+	if (str_to_ullong(str_value, value_r) < 0) {
+		e_warning(svinst->event,
+			  "invalid unsigned integer value for setting '%s': "
+			  "'%s'", setting, str_value);
+		return FALSE;
+	}
+	return TRUE;
+}
+
+bool sieve_setting_get_int_value(struct sieve_instance *svinst,
+				 const char *setting, long long int *value_r)
+{
+	const char *str_value;
+
+	str_value = sieve_setting_get(svinst, setting);
+	if (str_value == NULL || *str_value == '\0')
+		return FALSE;
+
+	if (str_to_llong(str_value, value_r) < 0) {
+		e_warning(svinst->event,
+			  "invalid integer value for setting '%s': '%s'",
+			  setting, str_value);
+		return FALSE;
+	}
+	return TRUE;
+}
+
+bool sieve_setting_get_size_value(struct sieve_instance *svinst,
+				  const char *setting, size_t *value_r)
+{
+	const char *str_value;
+	uintmax_t value, multiply = 1;
+	const char *endp;
+
+	str_value = sieve_setting_get(svinst, setting);
+	if (str_value == NULL || *str_value == '\0')
+		return FALSE;
+
+	if (str_parse_uintmax(str_value, &value, &endp) < 0) {
+		e_warning(svinst->event,
+			  "invalid size value for setting '%s': '%s'",
+			  setting, str_value);
+		return FALSE;
+	}
+	switch (i_toupper(*endp)) {
+	case '\0': /* default */
+	case 'B': /* byte (useless) */
+		multiply = 1;
+		break;
+	case 'K': /* kilobyte */
+		multiply = 1024;
+		break;
+	case 'M': /* megabyte */
+		multiply = 1024*1024;
+		break;
+	case 'G': /* gigabyte */
+		multiply = 1024*1024*1024;
+		break;
+	case 'T': /* terabyte */
+		multiply = 1024ULL*1024*1024*1024;
+		break;
+	default:
+		e_warning(svinst->event,
+			  "invalid size value for setting '%s': '%s'",
+			  setting, str_value);
+		return FALSE;
+	}
+
+	if (value > SSIZE_T_MAX / multiply) {
+		e_warning(svinst->event,
+			  "overflowing size value for setting '%s': '%s'",
+			  setting, str_value);
+		return FALSE;
+	}
+
+	*value_r = (size_t)(value * multiply);
+	return TRUE;
+}
+
+bool sieve_setting_get_bool_value(struct sieve_instance *svinst,
+				  const char *setting, bool *value_r)
+{
+	const char *str_value;
+
+	str_value = sieve_setting_get(svinst, setting);
+	if (str_value == NULL)
+		return FALSE;
+
+	str_value = t_str_trim(str_value, "\t ");
+	if (*str_value == '\0')
+		return FALSE;
+
+ 	if (strcasecmp(str_value, "yes") == 0) {
+		*value_r = TRUE;
+		return TRUE;
+	}
+
+ 	if (strcasecmp(str_value, "no") == 0) {
+		*value_r = FALSE;
+		return TRUE;
+	}
+
+	e_warning(svinst->event,
+		  "invalid boolean value for setting '%s': '%s'",
+		  setting, str_value);
+	return FALSE;
+}
+
+bool sieve_setting_get_duration_value(struct sieve_instance *svinst,
+				      const char *setting,
+				      sieve_number_t *value_r)
+{
+	const char *str_value;
+	uintmax_t value, multiply = 1;
+	const char *endp;
+
+	str_value = sieve_setting_get(svinst, setting);
+	if (str_value == NULL)
+		return FALSE;
+
+	str_value = t_str_trim(str_value, "\t ");
+	if (*str_value == '\0')
+		return FALSE;
+
+	if (str_parse_uintmax(str_value, &value, &endp) < 0) {
+		e_warning(svinst->event,
+			  "invalid duration value for setting '%s': '%s'",
+			  setting, str_value);
+		return FALSE;
+	}
+
+	switch (i_tolower(*endp)) {
+	case '\0': /* default */
+	case 's': /* seconds */
+		multiply = 1;
+		break;
+	case 'm': /* minutes */
+		multiply = 60;
+		break;
+	case 'h': /* hours */
+		multiply = 60*60;
+		break;
+	case 'd': /* days */
+		multiply = 24*60*60;
+		break;
+	default:
+		e_warning(svinst->event,
+			  "invalid duration value for setting '%s': '%s'",
+			  setting, str_value);
+		return FALSE;
+	}
+
+	if (value > SIEVE_MAX_NUMBER / multiply) {
+		e_warning(svinst->event,
+			  "overflowing duration value for setting '%s': '%s'",
+			  setting, str_value);
+		return FALSE;
+	}
+
+	*value_r = (unsigned int)(value * multiply);
+	return TRUE;
+}
+
+/*
+ * Main Sieve engine settings
+ */
+
+void sieve_settings_load(struct sieve_instance *svinst)
+{
+	const char *str_setting, *error;
+	unsigned long long int uint_setting;
+	size_t size_setting;
+	sieve_number_t period;
+
+	svinst->max_script_size = SIEVE_DEFAULT_MAX_SCRIPT_SIZE;
+	if (sieve_setting_get_size_value(svinst, "sieve_max_script_size",
+					 &size_setting))
+		svinst->max_script_size = size_setting;
+
+	svinst->max_actions = SIEVE_DEFAULT_MAX_ACTIONS;
+	if (sieve_setting_get_uint_value(svinst, "sieve_max_actions",
+					 &uint_setting))
+		svinst->max_actions = (unsigned int)uint_setting;
+
+	svinst->max_redirects = SIEVE_DEFAULT_MAX_REDIRECTS;
+	if (sieve_setting_get_uint_value(svinst, "sieve_max_redirects",
+					 &uint_setting))
+		svinst->max_redirects = (unsigned int)uint_setting;
+
+	svinst->max_cpu_time_secs =
+		(svinst->env_location == SIEVE_ENV_LOCATION_MS ?
+		 0 : SIEVE_DEFAULT_MAX_CPU_TIME_SECS);
+	if (sieve_setting_get_duration_value(svinst, "sieve_max_cpu_time",
+					     &period)) {
+		if (period > (UINT_MAX / 1000))
+			svinst->max_cpu_time_secs = (UINT_MAX / 1000);
+		else
+			svinst->max_cpu_time_secs = (unsigned int)period;
+	}
+	svinst->resource_usage_timeout_secs =
+		SIEVE_DEFAULT_RESOURCE_USAGE_TIMEOUT_SECS;
+	if (sieve_setting_get_duration_value(
+		svinst, "sieve_resource_usage_timeout", &period)) {
+		if (period > UINT_MAX)
+			svinst->resource_usage_timeout_secs = UINT_MAX;
+		else {
+			svinst->resource_usage_timeout_secs =
+				(unsigned int)period;
+		}
+	}
+
+	(void)sieve_address_source_parse_from_setting(
+		svinst,	svinst->pool, "sieve_redirect_envelope_from",
+		&svinst->redirect_from);
+
+	svinst->redirect_duplicate_period = DEFAULT_REDIRECT_DUPLICATE_PERIOD;
+	if (sieve_setting_get_duration_value(
+		svinst, "sieve_redirect_duplicate_period", &period)) {
+		if (period > UINT_MAX)
+			svinst->redirect_duplicate_period = UINT_MAX;
+		else {
+			svinst->redirect_duplicate_period =
+				(unsigned int)period;
+		}
+	}
+
+	str_setting = sieve_setting_get(svinst, "sieve_user_email");
+	if (str_setting != NULL && *str_setting != '\0') {
+		struct smtp_address *address;
+		if (smtp_address_parse_path(
+			svinst->pool, str_setting,
+			SMTP_ADDRESS_PARSE_FLAG_BRACKETS_OPTIONAL,
+			&address, &error) < 0) {
+			e_warning(svinst->event,
+				  "Invalid address value for setting "
+				  "`sieve_user_email': %s", error);
+		} else {
+			svinst->user_email = address;
+		}
+	}
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-settings.h b/pigeonhole/src/lib-sieve/sieve-settings.h
new file mode 100644
index 0000000..f2dfca2
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-settings.h
@@ -0,0 +1,57 @@
+#ifndef SIEVE_SETTINGS_H
+#define SIEVE_SETTINGS_H
+
+#include "sieve-common.h"
+
+/*
+ * Access to settings
+ */
+
+static inline const char *
+sieve_setting_get(struct sieve_instance *svinst, const char *identifier)
+{
+	const struct sieve_callbacks *callbacks = svinst->callbacks;
+
+	if (callbacks == NULL || callbacks->get_setting == NULL)
+		return NULL;
+
+	return callbacks->get_setting(svinst->context, identifier);
+}
+
+bool sieve_setting_get_uint_value(struct sieve_instance *svinst,
+				  const char *setting,
+				  unsigned long long int *value_r);
+bool sieve_setting_get_int_value(struct sieve_instance *svinst,
+				 const char *setting, long long int *value_r);
+bool sieve_setting_get_size_value(struct sieve_instance *svinst,
+				  const char *setting, size_t *value_r);
+bool sieve_setting_get_bool_value(struct sieve_instance *svinst,
+				  const char *setting, bool *value_r);
+bool sieve_setting_get_duration_value(struct sieve_instance *svinst,
+				      const char *setting,
+				      sieve_number_t *value_r);
+
+/*
+ * Main Sieve engine settings
+ */
+
+void sieve_settings_load(struct sieve_instance *svinst);
+
+/*
+ * Home directory
+ */
+
+static inline const char *
+sieve_environment_get_homedir(struct sieve_instance *svinst)
+{
+	const struct sieve_callbacks *callbacks = svinst->callbacks;
+
+	if (svinst->home_dir != NULL)
+		return svinst->home_dir;
+	if (callbacks == NULL || callbacks->get_homedir == NULL)
+		return NULL;
+
+	return callbacks->get_homedir(svinst->context);
+}
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-smtp.c b/pigeonhole/src/lib-sieve/sieve-smtp.c
new file mode 100644
index 0000000..40b40ea
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-smtp.c
@@ -0,0 +1,95 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+#include "lib.h"
+#include "smtp-address.h"
+
+#include "sieve-common.h"
+#include "sieve-smtp.h"
+
+struct sieve_smtp_context {
+	const struct sieve_script_env *senv;
+	void *handle;
+	
+	bool sent:1;
+};
+
+bool sieve_smtp_available
+(const struct sieve_script_env *senv)
+{
+	return ( senv->smtp_start != NULL && senv->smtp_add_rcpt != NULL &&
+		senv->smtp_send != NULL && senv->smtp_finish != NULL );
+}
+
+struct sieve_smtp_context *sieve_smtp_start
+(const struct sieve_script_env *senv,
+	const struct smtp_address *mail_from)
+{
+	struct sieve_smtp_context *sctx;
+	void *handle;
+
+	if ( !sieve_smtp_available(senv) )
+		return NULL;
+
+	handle = senv->smtp_start(senv, mail_from);
+	i_assert( handle != NULL );
+	
+	sctx = i_new(struct sieve_smtp_context, 1);
+	sctx->senv = senv;
+	sctx->handle = handle;
+
+	return sctx;
+}
+
+void sieve_smtp_add_rcpt
+(struct sieve_smtp_context *sctx,
+	const struct smtp_address *rcpt_to)
+{
+	i_assert(!sctx->sent);
+	sctx->senv->smtp_add_rcpt(sctx->senv, sctx->handle, rcpt_to);
+}
+
+struct ostream *sieve_smtp_send
+(struct sieve_smtp_context *sctx)
+{
+	i_assert(!sctx->sent);
+	sctx->sent = TRUE;
+
+	return sctx->senv->smtp_send(sctx->senv, sctx->handle);
+}
+
+struct sieve_smtp_context *sieve_smtp_start_single
+(const struct sieve_script_env *senv,
+	const struct smtp_address *rcpt_to,
+		const struct smtp_address *mail_from,
+	struct ostream **output_r)
+{
+	struct sieve_smtp_context *sctx;
+
+	sctx = sieve_smtp_start(senv, mail_from);
+	sieve_smtp_add_rcpt(sctx, rcpt_to);
+	*output_r = sieve_smtp_send(sctx);
+
+	return sctx;
+}
+
+void sieve_smtp_abort
+(struct sieve_smtp_context *sctx)
+{
+	const struct sieve_script_env *senv = sctx->senv;
+	void *handle = sctx->handle;
+
+	i_free(sctx);
+	i_assert(senv->smtp_abort != NULL);
+	senv->smtp_abort(senv, handle);
+}
+
+int sieve_smtp_finish
+(struct sieve_smtp_context *sctx, const char **error_r)
+{
+	const struct sieve_script_env *senv = sctx->senv;
+	void *handle = sctx->handle;
+
+	i_free(sctx);
+	return senv->smtp_finish(senv, handle, error_r);
+}
+
diff --git a/pigeonhole/src/lib-sieve/sieve-smtp.h b/pigeonhole/src/lib-sieve/sieve-smtp.h
new file mode 100644
index 0000000..f7b9c84
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-smtp.h
@@ -0,0 +1,31 @@
+#ifndef SIEVE_SMTP_H
+#define SIEVE_SMTP_H
+
+#include "sieve-common.h"
+
+bool sieve_smtp_available
+	(const struct sieve_script_env *senv);
+
+struct sieve_smtp_context;
+
+struct sieve_smtp_context *sieve_smtp_start
+	(const struct sieve_script_env *senv,
+		const struct smtp_address *mail_from);
+void sieve_smtp_add_rcpt
+	(struct sieve_smtp_context *sctx,
+		const struct smtp_address *rcpt_to);
+struct ostream *sieve_smtp_send
+	(struct sieve_smtp_context *sctx);
+
+struct sieve_smtp_context *sieve_smtp_start_single
+	(const struct sieve_script_env *senv,
+		const struct smtp_address *rcpt_to,
+		const struct smtp_address *mail_from,
+		struct ostream **output_r);
+
+void sieve_smtp_abort
+	(struct sieve_smtp_context *sctx);
+int sieve_smtp_finish
+	(struct sieve_smtp_context *sctx, const char **error_r);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-storage-private.h b/pigeonhole/src/lib-sieve/sieve-storage-private.h
new file mode 100644
index 0000000..16af3d4
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-storage-private.h
@@ -0,0 +1,256 @@
+#ifndef SIEVE_STORAGE_PRIVATE_H
+#define SIEVE_STORAGE_PRIVATE_H
+
+#include "sieve.h"
+#include "sieve-error-private.h"
+
+#include "sieve-storage.h"
+
+#define MAILBOX_ATTRIBUTE_PREFIX_SIEVE \
+	MAILBOX_ATTRIBUTE_PREFIX_DOVECOT_PVT_SERVER"sieve/"
+#define MAILBOX_ATTRIBUTE_PREFIX_SIEVE_FILES \
+	MAILBOX_ATTRIBUTE_PREFIX_SIEVE"files/"
+#define MAILBOX_ATTRIBUTE_SIEVE_DEFAULT \
+	MAILBOX_ATTRIBUTE_PREFIX_SIEVE"default"
+
+#define MAILBOX_ATTRIBUTE_SIEVE_DEFAULT_LINK 'L'
+#define MAILBOX_ATTRIBUTE_SIEVE_DEFAULT_SCRIPT 'S'
+
+struct sieve_storage;
+
+ARRAY_DEFINE_TYPE(sieve_storage_class, const struct sieve_storage *);
+
+struct sieve_storage_vfuncs {
+	struct sieve_storage *(*alloc)(void);
+	void (*destroy)(struct sieve_storage *storage);
+	int (*init)(struct sieve_storage *storage, const char *const *options,
+		    enum sieve_error *error_r);
+
+	int (*get_last_change)(struct sieve_storage *storage,
+			       time_t *last_change_r);
+	void (*set_modified)(struct sieve_storage *storage, time_t mtime);
+
+	int (*is_singular)(struct sieve_storage *storage);
+
+	/* script access */
+	struct sieve_script *(*get_script)(struct sieve_storage *storage,
+					   const char *name);
+
+	/* script sequence */
+	struct sieve_script_sequence *(*get_script_sequence)(
+		struct sieve_storage *storage, enum sieve_error *error_r);
+	struct sieve_script *(*script_sequence_next)(
+		struct sieve_script_sequence *seq, enum sieve_error *error_r);
+	void (*script_sequence_destroy)(struct sieve_script_sequence *seq);
+
+	/* active script */
+	int (*active_script_get_name)(struct sieve_storage *storage,
+				      const char **name_r);
+	struct sieve_script *(*active_script_open)(
+		struct sieve_storage *storage);
+	int (*deactivate)(struct sieve_storage *storage);
+	int (*active_script_get_last_change)(struct sieve_storage *storage,
+					     time_t *last_change_r);
+
+	/* listing scripts */
+	struct sieve_storage_list_context *(*list_init)(
+		struct sieve_storage *storage);
+	const char *(*list_next)(struct sieve_storage_list_context *lctx,
+				 bool *active_r);
+	int (*list_deinit)(struct sieve_storage_list_context *lctx);
+
+	/* saving scripts */
+	// FIXME: simplify this API; reduce this mostly to a single save function
+	struct sieve_storage_save_context *(*save_alloc)(
+		struct sieve_storage *storage);
+	int (*save_init)(struct sieve_storage_save_context *sctx,
+			 const char *scriptname, struct istream *input);
+	int (*save_continue)(struct sieve_storage_save_context *sctx);
+	int (*save_finish)(struct sieve_storage_save_context *sctx);
+	struct sieve_script *(*save_get_tempscript)(
+		struct sieve_storage_save_context *sctx);
+	void (*save_cancel)(struct sieve_storage_save_context *sctx);
+	int (*save_commit)(struct sieve_storage_save_context *sctx);
+	int (*save_as)(struct sieve_storage *storage, struct istream *input,
+		       const char *name);
+	int (*save_as_active)(struct sieve_storage *storage,
+			      struct istream *input, time_t mtime);
+
+	/* checking quota */
+	int (*quota_havespace)(struct sieve_storage *storage,
+			       const char *scriptname, size_t size,
+			       enum sieve_storage_quota *quota_r,
+			       uint64_t *limit_r);
+};
+
+struct sieve_storage {
+	pool_t pool;
+	unsigned int refcount;
+	struct sieve_instance *svinst;
+	struct event *event;
+
+	const char *driver_name;
+	unsigned int version;
+
+	const struct sieve_storage *storage_class;
+	struct sieve_storage_vfuncs v;
+
+	uint64_t max_scripts;
+	uint64_t max_storage;
+
+	char *error;
+	enum sieve_error error_code;
+
+	const char *data;
+	const char *location;
+	const char *script_name;
+	const char *bin_dir;
+
+	const char *default_name;
+	const char *default_location;
+	struct sieve_storage *default_for;
+
+	struct mail_namespace *sync_inbox_ns;
+
+	enum sieve_storage_flags flags;
+
+	/* this is the main personal storage */
+	bool main_storage:1;
+	bool allows_synchronization:1;
+	bool is_default:1;
+};
+
+struct event *
+sieve_storage_event_create(struct sieve_instance *svinst,
+			   const struct sieve_storage *storage_class);
+struct sieve_storage *
+sieve_storage_alloc(struct sieve_instance *svinst, struct event *event,
+		    const struct sieve_storage *storage_class, const char *data,
+		    enum sieve_storage_flags flags, bool main) ATTR_NULL(2, 4);
+
+int sieve_storage_setup_bindir(struct sieve_storage *storage, mode_t mode);
+
+/*
+ * Active script
+ */
+
+int sieve_storage_active_script_is_default(struct sieve_storage *storage);
+
+/*
+ * Listing scripts
+ */
+
+struct sieve_storage_list_context {
+	struct sieve_storage *storage;
+
+	bool seen_active:1; // Just present for assertions
+	bool seen_default:1;
+};
+
+/*
+ * Script sequence
+ */
+
+struct sieve_script_sequence {
+	struct sieve_storage *storage;
+};
+
+/*
+ * Saving scripts
+ */
+
+struct sieve_storage_save_context {
+	pool_t pool;
+	struct sieve_storage *storage;
+	struct event *event;
+
+	const char *scriptname, *active_scriptname;
+	struct sieve_script *scriptobject;
+
+	struct istream *input;
+
+	time_t mtime;
+
+	bool failed:1;
+	bool finished:1;
+};
+
+/*
+ * Storage class
+ */
+
+struct sieve_storage_class_registry;
+
+void sieve_storages_init(struct sieve_instance *svinst);
+void sieve_storages_deinit(struct sieve_instance *svinst);
+
+void sieve_storage_class_register(struct sieve_instance *svinst,
+				  const struct sieve_storage *storage_class);
+void sieve_storage_class_unregister(struct sieve_instance *svinst,
+				    const struct sieve_storage *storage_class);
+const struct sieve_storage *
+sieve_storage_find_class(struct sieve_instance *svinst, const char *name);
+
+/*
+ * Built-in storage drivers
+ */
+
+/* data (currently only for internal use) */
+
+#define SIEVE_DATA_STORAGE_DRIVER_NAME "data"
+
+extern const struct sieve_storage sieve_data_storage;
+
+/* file */
+
+#define SIEVE_FILE_STORAGE_DRIVER_NAME "file"
+
+extern const struct sieve_storage sieve_file_storage;
+
+struct sieve_storage *
+sieve_file_storage_init_legacy(struct sieve_instance *svinst,
+			       const char *active_path,
+			       const char *storage_path,
+			       enum sieve_storage_flags flags,
+			       enum sieve_error *error_r) ATTR_NULL(6);
+
+/* dict */
+
+#define SIEVE_DICT_STORAGE_DRIVER_NAME "dict"
+
+extern const struct sieve_storage sieve_dict_storage;
+
+/* ldap */
+
+#define SIEVE_LDAP_STORAGE_DRIVER_NAME "ldap"
+
+extern const struct sieve_storage sieve_ldap_storage;
+
+/*
+ * Error handling
+ */
+
+void sieve_storage_set_internal_error(struct sieve_storage *storage);
+
+void sieve_storage_copy_error(struct sieve_storage *storage,
+			      const struct sieve_storage *source);
+
+/*
+ * Synchronization
+ */
+
+int sieve_storage_sync_init(struct sieve_storage *storage,
+			    struct mail_user *user);
+void sieve_storage_sync_deinit(struct sieve_storage *storage);
+
+int sieve_storage_sync_script_save(struct sieve_storage *storage,
+				   const char *name);
+int sieve_storage_sync_script_rename(struct sieve_storage *storage,
+				     const char *oldname, const char *newname);
+int sieve_storage_sync_script_delete(struct sieve_storage *storage,
+				     const char *name);
+
+int sieve_storage_sync_script_activate(struct sieve_storage *storage);
+int sieve_storage_sync_deactivate(struct sieve_storage *storage);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-storage-sync.c b/pigeonhole/src/lib-sieve/sieve-storage-sync.c
new file mode 100644
index 0000000..b1abfcc
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-storage-sync.c
@@ -0,0 +1,195 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "array.h"
+#include "str-sanitize.h"
+#include "home-expand.h"
+#include "eacces-error.h"
+#include "mkdir-parents.h"
+#include "ioloop.h"
+#include "mail-storage-private.h"
+
+#include "sieve-common.h"
+#include "sieve-settings.h"
+#include "sieve-error-private.h"
+
+#include "sieve-script-private.h"
+#include "sieve-storage-private.h"
+
+/*
+ * Synchronization
+ */
+
+int sieve_storage_sync_init
+(struct sieve_storage *storage, struct mail_user *user)
+{
+	enum sieve_storage_flags sflags = storage->flags;
+
+	if ( (sflags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) == 0 &&
+		(sflags & SIEVE_STORAGE_FLAG_READWRITE) == 0 )
+		return 0;
+
+	if ( !storage->allows_synchronization ) {
+		if ( (sflags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) != 0 )
+			return -1;
+		return 0;
+	}
+
+	e_debug(storage->event, "sync: Synchronization active");
+
+	storage->sync_inbox_ns = mail_namespace_find_inbox(user->namespaces);
+	return 0;
+}
+
+void sieve_storage_sync_deinit
+(struct sieve_storage *storage ATTR_UNUSED)
+{
+	/* nothing */
+}
+
+/*
+ * Sync attributes
+ */
+
+static int sieve_storage_sync_transaction_begin
+(struct sieve_storage *storage, struct mailbox_transaction_context **trans_r)
+{
+	enum mailbox_flags mflags = MAILBOX_FLAG_IGNORE_ACLS;
+	struct mail_namespace *ns = storage->sync_inbox_ns;
+	struct mailbox *inbox;
+	enum mail_error error;
+
+	if (ns == NULL)
+		return 0;
+
+	inbox = mailbox_alloc(ns->list, "INBOX", mflags);
+	if (mailbox_open(inbox) < 0) {
+		e_warning(storage->event, "sync: "
+			  "Failed to open user INBOX for attribute modifications: %s",
+			  mailbox_get_last_internal_error(inbox, &error));
+		mailbox_free(&inbox);
+		return -1;
+	}
+
+	*trans_r = mailbox_transaction_begin(inbox,
+					     MAILBOX_TRANSACTION_FLAG_EXTERNAL,
+					     __func__);
+	return 1;
+}
+
+static int sieve_storage_sync_transaction_finish
+(struct sieve_storage *storage, struct mailbox_transaction_context **trans)
+{
+	struct mailbox *inbox;
+	int ret;
+
+	inbox = mailbox_transaction_get_mailbox(*trans);
+
+	if ((ret=mailbox_transaction_commit(trans)) < 0) {
+		enum mail_error error;
+		
+		e_warning(storage->event, "sync: "
+			  "Failed to update INBOX attributes: %s",
+			   mail_storage_get_last_error(
+				mailbox_get_storage(inbox), &error));
+	}
+
+	mailbox_free(&inbox);
+	return ret;
+}
+
+int sieve_storage_sync_script_save
+(struct sieve_storage *storage, const char *name)
+{
+	struct mailbox_transaction_context *trans;
+	const char *key;
+	int ret;
+
+	if ((ret=sieve_storage_sync_transaction_begin
+		(storage, &trans)) <= 0)
+		return ret;
+
+	key = t_strconcat
+		(MAILBOX_ATTRIBUTE_PREFIX_SIEVE_FILES, name, NULL);
+
+	mail_index_attribute_set(trans->itrans, TRUE, key, ioloop_time, 0);
+
+	return sieve_storage_sync_transaction_finish(storage, &trans);
+}
+
+int sieve_storage_sync_script_rename
+(struct sieve_storage *storage, const char *oldname,
+	const char *newname)
+{
+	struct mailbox_transaction_context *trans;
+	const char *oldkey, *newkey;
+	int ret;
+
+	if ((ret=sieve_storage_sync_transaction_begin
+		(storage, &trans)) <= 0)
+		return ret;
+
+	oldkey = t_strconcat
+		(MAILBOX_ATTRIBUTE_PREFIX_SIEVE_FILES, oldname, NULL);
+	newkey = t_strconcat
+		(MAILBOX_ATTRIBUTE_PREFIX_SIEVE_FILES, newname, NULL);
+
+	mail_index_attribute_unset(trans->itrans, TRUE, oldkey, ioloop_time);
+	mail_index_attribute_set(trans->itrans, TRUE, newkey, ioloop_time, 0);
+
+	return sieve_storage_sync_transaction_finish(storage, &trans);
+}
+
+int sieve_storage_sync_script_delete
+(struct sieve_storage *storage, const char *name)
+{
+	struct mailbox_transaction_context *trans;
+	const char *key;
+	int ret;
+
+	if ((ret=sieve_storage_sync_transaction_begin
+		(storage, &trans)) <= 0)
+		return ret;
+
+	key = t_strconcat
+		(MAILBOX_ATTRIBUTE_PREFIX_SIEVE_FILES, name, NULL);
+
+	mail_index_attribute_unset(trans->itrans, TRUE, key, ioloop_time);
+
+	return sieve_storage_sync_transaction_finish(storage, &trans);
+}
+
+int sieve_storage_sync_script_activate
+(struct sieve_storage *storage)
+{
+	struct mailbox_transaction_context *trans;
+	int ret;
+
+	if ((ret=sieve_storage_sync_transaction_begin
+		(storage, &trans)) <= 0)
+		return ret;
+
+	mail_index_attribute_set(trans->itrans,
+		TRUE, MAILBOX_ATTRIBUTE_SIEVE_DEFAULT, ioloop_time, 0);
+
+	return sieve_storage_sync_transaction_finish(storage, &trans);
+}
+
+int sieve_storage_sync_deactivate
+(struct sieve_storage *storage)
+{
+	struct mailbox_transaction_context *trans;
+	int ret;
+
+	if ((ret=sieve_storage_sync_transaction_begin
+		(storage, &trans)) <= 0)
+		return ret;
+	
+	mail_index_attribute_unset(trans->itrans,
+		TRUE, MAILBOX_ATTRIBUTE_SIEVE_DEFAULT, ioloop_time);
+
+	return sieve_storage_sync_transaction_finish(storage, &trans);
+}
+
+
diff --git a/pigeonhole/src/lib-sieve/sieve-storage.c b/pigeonhole/src/lib-sieve/sieve-storage.c
new file mode 100644
index 0000000..1e2aa34
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-storage.c
@@ -0,0 +1,1590 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "array.h"
+#include "str-sanitize.h"
+#include "home-expand.h"
+#include "eacces-error.h"
+#include "mkdir-parents.h"
+#include "ioloop.h"
+
+#include "sieve-common.h"
+#include "sieve-settings.h"
+#include "sieve-error-private.h"
+
+#include "sieve-script-private.h"
+#include "sieve-storage-private.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <time.h>
+#include <utime.h>
+
+#define CRITICAL_MSG \
+  "Internal error occurred. Refer to server log for more information."
+#define CRITICAL_MSG_STAMP CRITICAL_MSG " [%Y-%m-%d %H:%M:%S]"
+
+struct event_category event_category_sieve_storage = {
+	.parent = &event_category_sieve,
+	.name = "sieve-storage",
+};
+
+/*
+ * Storage class
+ */
+
+struct sieve_storage_class_registry {
+	ARRAY_TYPE(sieve_storage_class) storage_classes;
+};
+
+void sieve_storages_init(struct sieve_instance *svinst)
+{
+	svinst->storage_reg = p_new(svinst->pool,
+				    struct sieve_storage_class_registry, 1);
+	p_array_init(&svinst->storage_reg->storage_classes, svinst->pool, 8);
+
+	sieve_storage_class_register(svinst, &sieve_file_storage);
+	sieve_storage_class_register(svinst, &sieve_dict_storage);
+	sieve_storage_class_register(svinst, &sieve_ldap_storage);
+}
+
+void sieve_storages_deinit(struct sieve_instance *svinst ATTR_UNUSED)
+{
+	/* nothing yet */
+}
+
+void sieve_storage_class_register(struct sieve_instance *svinst,
+				  const struct sieve_storage *storage_class)
+{
+	struct sieve_storage_class_registry *reg = svinst->storage_reg;
+	const struct sieve_storage *old_class;
+
+	old_class = sieve_storage_find_class(svinst,
+					     storage_class->driver_name);
+	if (old_class != NULL) {
+		if (old_class->v.alloc == NULL) {
+			/* replacing a "support not compiled in" storage class
+			 */
+			sieve_storage_class_unregister(svinst, old_class);
+		} else {
+			i_panic("sieve_storage_class_register(%s): "
+				"Already registered",
+				storage_class->driver_name);
+		}
+	}
+
+	array_append(&reg->storage_classes, &storage_class, 1);
+}
+
+void sieve_storage_class_unregister(struct sieve_instance *svinst,
+				    const struct sieve_storage *storage_class)
+{
+	struct sieve_storage_class_registry *reg = svinst->storage_reg;
+	const struct sieve_storage *const *classes;
+	unsigned int i, count;
+
+	classes = array_get(&reg->storage_classes, &count);
+	for (i = 0; i < count; i++) {
+		if (classes[i] == storage_class) {
+			array_delete(&reg->storage_classes, i, 1);
+			break;
+		}
+	}
+}
+
+const struct sieve_storage *
+sieve_storage_find_class(struct sieve_instance *svinst, const char *name)
+{
+	struct sieve_storage_class_registry *reg = svinst->storage_reg;
+	const struct sieve_storage *const *classes;
+	unsigned int i, count;
+
+	i_assert(name != NULL);
+
+	classes = array_get(&reg->storage_classes, &count);
+	for (i = 0; i < count; i++) {
+		if (strcasecmp(classes[i]->driver_name, name) == 0)
+			return classes[i];
+	}
+	return NULL;
+}
+
+/*
+ * Storage instance
+ */
+
+static const char *split_next_arg(const char *const **_args)
+{
+	const char *const *args = *_args;
+	const char *str = args[0];
+
+	/* join arguments for escaped ";" separator */
+
+	args++;
+	while (*args != NULL && **args == '\0') {
+		args++;
+		if (*args == NULL) {
+			/* string ends with ";", just ignore it. */
+			break;
+		}
+		str = t_strconcat(str, ";", *args, NULL);
+		args++;
+	}
+	*_args = args;
+	return str;
+}
+
+static int
+sieve_storage_driver_parse(struct sieve_instance *svinst, const char **data,
+			   const struct sieve_storage **driver_r)
+{
+	const struct sieve_storage *storage_class = NULL;
+	const char *p;
+
+	p = strchr(*data, ':');
+	if (p == NULL)
+		return 0;
+
+	/* Lookup storage driver */
+	T_BEGIN {
+		const char *driver;
+
+		driver = t_strdup_until(*data, p);
+		*data = p+1;
+
+		storage_class = sieve_storage_find_class(svinst, driver);
+		if (storage_class == NULL) {
+			e_error(svinst->event,
+				"Unknown storage driver module `%s'",
+				driver);
+		} else if (storage_class->v.alloc == NULL) {
+			e_error(svinst->event,
+				"Support not compiled in for storage driver `%s'",
+				driver);
+			storage_class = NULL;
+		}
+	} T_END;
+
+	*driver_r = storage_class;
+	return (storage_class == NULL ? -1 : 1);
+}
+
+static int
+sieve_storage_data_parse(struct sieve_storage *storage, const char *data,
+			 const char **location_r, const char *const **options_r)
+{
+	ARRAY_TYPE(const_string) options;
+	const char *const *tmp;
+
+	if (*data == '\0') {
+		*options_r = NULL;
+		*location_r = data;
+		return 0;
+	}
+
+	/* <location> */
+	tmp = t_strsplit(data, ";");
+	*location_r = split_next_arg(&tmp);
+
+	if (options_r != NULL) {
+		t_array_init(&options, 8);
+
+		/* [<option> *(';' <option>)] */
+		while (*tmp != NULL) {
+			const char *option = split_next_arg(&tmp);
+
+			if (strncasecmp(option, "name=", 5) == 0) {
+				if (option[5] == '\0') {
+					e_error(storage->event,
+						"Failed to parse storage location: "
+						"Empty name not allowed");
+					return -1;
+				}
+
+				if (storage->script_name == NULL) {
+					if (!sieve_script_name_is_valid(option+5)) {
+						e_error(storage->event,
+							"Failed to parse storage location: "
+							"Invalid script name `%s'.",
+							str_sanitize(option+5, 80));
+						return -1;
+					}
+					storage->script_name = p_strdup(storage->pool, option+5);
+				}
+
+			} else if (strncasecmp(option, "bindir=", 7) == 0) {
+				const char *bin_dir = option+7;
+
+				if (bin_dir[0] == '\0') {
+					e_error(storage->event,
+						"Failed to parse storage location: "
+						"Empty bindir not allowed");
+					return -1;
+				}
+
+				if (bin_dir[0] == '~') {
+					/* home-relative path. change to absolute. */
+					const char *home = sieve_environment_get_homedir(storage->svinst);
+
+					if (home != NULL) {
+						bin_dir = home_expand_tilde(bin_dir, home);
+					} else if (bin_dir[1] == '/' || bin_dir[1] == '\0') {
+						e_error(storage->event,
+							"Failed to parse storage location: "
+							"bindir is relative to home directory (~/), "
+							"but home directory cannot be determined");
+						return -1;
+					}
+				}
+
+				storage->bin_dir = p_strdup(storage->pool, bin_dir);
+			} else {
+				array_append(&options, &option, 1);
+			}
+		}
+
+		(void)array_append_space(&options);
+		*options_r = array_idx(&options, 0);
+	}
+
+	return 0;
+}
+
+struct event *
+sieve_storage_event_create(struct sieve_instance *svinst,
+			   const struct sieve_storage *storage_class)
+{
+	struct event *event;
+
+	event = event_create(svinst->event);
+	event_add_category(event, &event_category_sieve_storage);
+	event_add_str(event, "driver", storage_class->driver_name);
+	event_set_append_log_prefix(
+		event, t_strdup_printf("%s storage: ",
+				       storage_class->driver_name));
+
+	return event;
+}
+
+struct sieve_storage *
+sieve_storage_alloc(struct sieve_instance *svinst, struct event *event,
+		    const struct sieve_storage *storage_class, const char *data,
+		    enum sieve_storage_flags flags, bool main)
+{
+	struct sieve_storage *storage;
+
+	i_assert(storage_class->v.alloc != NULL);
+	storage = storage_class->v.alloc();
+
+	storage->storage_class = storage_class;
+	storage->refcount = 1;
+	storage->svinst = svinst;
+	storage->flags = flags;
+	storage->data = p_strdup_empty(storage->pool, data);
+	storage->main_storage = main;
+
+	if (event != NULL) {
+		storage->event = event;
+		event_ref(storage->event);
+	} else {
+		storage->event =
+			sieve_storage_event_create(svinst, storage_class);
+	}
+
+	return storage;
+}
+
+static struct sieve_storage *
+sieve_storage_init(struct sieve_instance *svinst,
+		   const struct sieve_storage *storage_class, const char *data,
+		   enum sieve_storage_flags flags, bool main,
+		   enum sieve_error *error_r)
+{
+	struct sieve_storage *storage;
+	const char *const *options;
+	const char *location;
+	struct event *event;
+	enum sieve_error error;
+
+	if (error_r != NULL)
+		*error_r = SIEVE_ERROR_NONE;
+	else
+		error_r = &error;
+
+	i_assert(storage_class->v.init != NULL);
+
+	event = sieve_storage_event_create(svinst, storage_class);
+
+	if ((flags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) != 0 &&
+	    !storage_class->allows_synchronization) {
+		e_debug(event, "Storage does not support synchronization");
+		*error_r = SIEVE_ERROR_NOT_POSSIBLE;
+		event_unref(&event);
+		return NULL;
+	}
+
+	if ((flags & SIEVE_STORAGE_FLAG_READWRITE) != 0 &&
+	    storage_class->v.save_init == NULL) {
+		e_error(event, "Storage does not support write access");
+		*error_r = SIEVE_ERROR_TEMP_FAILURE;
+		event_unref(&event);
+		return NULL;
+	}
+
+	T_BEGIN {	
+		storage = sieve_storage_alloc(svinst, event, storage_class,
+					      data, flags, main);
+
+		if (sieve_storage_data_parse(storage, data,
+					     &location, &options) < 0) {
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+			sieve_storage_unref(&storage);
+			storage = NULL;
+		} else {
+			storage->location = p_strdup(storage->pool, location);
+
+			event_add_str(event, "script_location",
+				      storage->location);
+
+			if (storage_class->v.init(storage, options,
+						  error_r) < 0) {
+				sieve_storage_unref(&storage);
+				storage = NULL;
+			}
+		}
+	} T_END;
+
+	event_unref(&event);
+	return storage;
+}
+
+struct sieve_storage *
+sieve_storage_create(struct sieve_instance *svinst, const char *location,
+		     enum sieve_storage_flags flags, enum sieve_error *error_r)
+{
+	const struct sieve_storage *storage_class;
+	enum sieve_error error;
+	const char *data;
+	int ret;
+
+	/* Dont use this function for creating a synchronizing storage */
+	i_assert((flags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) == 0);
+
+	if (error_r != NULL)
+		*error_r = SIEVE_ERROR_NONE;
+	else
+		error_r = &error;
+
+	data = location;
+	if ((ret = sieve_storage_driver_parse(svinst, &data,
+					      &storage_class)) < 0) {
+		*error_r = SIEVE_ERROR_TEMP_FAILURE;
+		return NULL;
+	}
+
+	if (ret == 0)
+		storage_class = &sieve_file_storage;
+
+	return sieve_storage_init(svinst, storage_class, data, flags,
+				  FALSE, error_r);
+}
+
+static struct sieve_storage *
+sieve_storage_do_create_main(struct sieve_instance *svinst,
+			     struct mail_user *user,
+			     enum sieve_storage_flags flags,
+			     enum sieve_error *error_r)
+{
+	struct sieve_storage *storage = NULL;
+	const struct sieve_storage
+		*sieve_class = NULL,
+		*sieve_dir_class = NULL;
+	const char *set_sieve, *set_sieve_dir;
+	const char *data, *storage_path;
+	unsigned long long int uint_setting;
+	size_t size_setting;
+	int ret;
+
+	/* Sieve storage location */
+
+	set_sieve = sieve_setting_get(svinst, "sieve");
+
+	if (set_sieve != NULL) {
+		if (*set_sieve == '\0') {
+			/* disabled */
+			e_debug(svinst->event, "storage: "
+				"Personal storage is disabled (sieve=\"\")");
+			*error_r = SIEVE_ERROR_NOT_FOUND;
+			return NULL;
+		}
+
+		data = set_sieve;
+		if ((ret = sieve_storage_driver_parse(svinst, &data,
+						      &sieve_class)) < 0) {
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+			return NULL;
+		}
+
+		if (ret > 0) {
+			/* The normal case: explicit driver name */
+			storage = sieve_storage_init(svinst, sieve_class, data,
+						     flags, TRUE, error_r);
+			if (storage == NULL)
+				return NULL;
+		}
+
+		/* No driver name */
+	}
+
+	if (storage == NULL) {
+		/* Script storage directory configuration (deprecated) */
+
+		set_sieve_dir = sieve_setting_get(svinst, "sieve_dir");
+		if (set_sieve_dir == NULL) {
+			set_sieve_dir = sieve_setting_get(svinst,
+							  "sieve_storage");
+		}
+
+		if (set_sieve_dir == NULL || *set_sieve_dir == '\0') {
+			storage_path = "";
+		} else {
+			const char *p;
+
+			/* Parse and check driver */
+			storage_path = set_sieve_dir;
+			if ((ret = sieve_storage_driver_parse(
+				svinst, &storage_path, &sieve_dir_class)) < 0) {
+				*error_r = SIEVE_ERROR_TEMP_FAILURE;
+				return NULL;
+			}
+
+			if (ret > 0 && sieve_dir_class != &sieve_file_storage) {
+				e_error(svinst->event, "storage: "
+					"Cannot use deprecated sieve_dir= setting "
+					"with `%s' driver for main Sieve storage",
+					sieve_dir_class->driver_name);
+			}
+
+			/* Ignore any options */
+			p = strchr(storage_path, ';');
+			if (p != NULL)
+				storage_path = t_strdup_until(storage_path, p);
+		}
+
+		storage = sieve_file_storage_init_legacy(svinst, set_sieve,
+							 storage_path, flags,
+							 error_r);
+	}
+
+	if (storage == NULL)
+		return NULL;
+
+	(void)sieve_storage_sync_init(storage, user);
+
+	/* Get quota settings if storage driver provides none */
+
+	if (storage->max_storage == 0 &&
+	    sieve_setting_get_size_value(svinst, "sieve_quota_max_storage",
+					 &size_setting)) {
+		storage->max_storage = size_setting;
+	}
+
+	if (storage->max_scripts == 0 &&
+	    sieve_setting_get_uint_value(svinst, "sieve_quota_max_scripts",
+					 &uint_setting)) {
+		storage->max_scripts = uint_setting;
+	}
+
+	if (storage->max_storage > 0) {
+		e_debug(storage->event, "quota: "
+			"Storage limit: %llu bytes",
+			(unsigned long long int) storage->max_storage);
+	}
+	if (storage->max_scripts > 0) {
+		e_debug(storage->event, "quota: "
+			"Script count limit: %llu scripts",
+			(unsigned long long int) storage->max_scripts);
+	}
+	return storage;
+}
+
+struct sieve_storage *
+sieve_storage_create_main(struct sieve_instance *svinst, struct mail_user *user,
+			  enum sieve_storage_flags flags,
+			  enum sieve_error *error_r)
+{
+	struct sieve_storage *storage;
+	const char *set_enabled, *set_default, *set_default_name;
+	enum sieve_error error;
+
+	if (error_r != NULL)
+		*error_r = SIEVE_ERROR_NONE;
+	else
+		error_r = &error;
+
+	/* Check whether Sieve is disabled for this user */
+	if ((set_enabled = sieve_setting_get(svinst, "sieve_enabled")) != NULL &&
+	    strcasecmp(set_enabled, "no") == 0) {
+		e_debug(svinst->event,
+			"Sieve is disabled for this user");
+		*error_r = SIEVE_ERROR_NOT_POSSIBLE;
+		return NULL;
+	}
+
+	/* Determine location for default script */
+	set_default = sieve_setting_get(svinst, "sieve_default");
+	if (set_default == NULL) {
+		/* For backwards compatibility */
+		set_default = sieve_setting_get(svinst, "sieve_global_path");
+	}
+
+	/* Attempt to locate user's main storage */
+	storage = sieve_storage_do_create_main(svinst, user, flags, error_r);
+	if (storage != NULL) {
+		/* Success; record default script location for later use */
+		storage->default_location =
+			p_strdup_empty(storage->pool, set_default);
+
+		set_default_name =
+			sieve_setting_get(svinst, "sieve_default_name");
+		if (set_default_name != NULL && *set_default_name != '\0' &&
+		    !sieve_script_name_is_valid(set_default_name)) {
+			e_error(storage->event,
+				"Invalid script name `%s' for `sieve_default_name' setting.",
+				str_sanitize(set_default_name, 80));
+			set_default_name = NULL;
+		}
+		storage->default_name =
+			p_strdup_empty(storage->pool, set_default_name);
+
+		if (storage->default_location != NULL &&
+			storage->default_name != NULL) {
+			e_debug(storage->event,
+				"Default script at `%s' is visible by name `%s'",
+				storage->default_location, storage->default_name);
+		}
+	} else if (*error_r != SIEVE_ERROR_TEMP_FAILURE &&
+		   (flags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) == 0 &&
+		   (flags & SIEVE_STORAGE_FLAG_READWRITE) == 0) {
+
+		/* Failed; try using default script location
+		   (not for temporary failures, read/write access, or dsync) */
+		if (set_default == NULL) {
+			e_debug(svinst->event, "storage: "
+				"No default script location configured");
+		} else {
+			e_debug(svinst->event, "storage: "
+				"Trying default script location `%s'",
+				set_default);
+
+			storage = sieve_storage_create(svinst, set_default, 0,
+						       error_r);
+			if (storage == NULL) {
+				switch (*error_r) {
+				case SIEVE_ERROR_NOT_FOUND:
+					e_debug(svinst->event, "storage: "
+						"Default script location `%s' not found",
+						set_default);
+					break;
+				case SIEVE_ERROR_TEMP_FAILURE:
+					e_error(svinst->event, "storage: "
+						"Failed to access default script location `%s' "
+						"(temporary failure)",
+						set_default);
+					break;
+				default:
+					e_error(svinst->event, "storage: "
+						"Failed to access default script location `%s'",
+						set_default);
+					break;
+				}
+			}
+		}
+		if (storage != NULL)
+			storage->is_default = TRUE;
+	}
+	return storage;
+}
+
+void sieve_storage_ref(struct sieve_storage *storage)
+{
+	storage->refcount++;
+}
+
+void sieve_storage_unref(struct sieve_storage **_storage)
+{
+	struct sieve_storage *storage = *_storage;
+
+	i_assert(storage->refcount > 0);
+
+	if (--storage->refcount != 0)
+		return;
+
+	if (storage->default_for != NULL) {
+		i_assert(storage->is_default);
+		sieve_storage_unref(&storage->default_for);
+	}
+
+	sieve_storage_sync_deinit(storage);
+
+	if (storage->v.destroy != NULL)
+		storage->v.destroy(storage);
+
+	i_free(storage->error);
+	event_unref(&storage->event);
+	pool_unref(&storage->pool);
+	*_storage = NULL;
+}
+
+int sieve_storage_setup_bindir(struct sieve_storage *storage, mode_t mode)
+{
+	const char *bin_dir = storage->bin_dir;
+	struct stat st;
+
+	if (bin_dir == NULL)
+		return -1;
+
+	if (stat(bin_dir, &st) == 0)
+		return 0;
+
+	if (errno == EACCES) {
+		e_error(storage->event,
+			"Failed to setup directory for binaries: "
+			"%s",	eacces_error_get("stat", bin_dir));
+		return -1;
+	} else if (errno != ENOENT) {
+		e_error(storage->event,
+			"Failed to setup directory for binaries: "
+			"stat(%s) failed: %m",
+			bin_dir);
+		return -1;
+	}
+
+	if (mkdir_parents(bin_dir, mode) == 0) {
+		e_debug(storage->event,
+			"Created directory for binaries: %s", bin_dir);
+		return 1;
+	}
+
+	switch (errno) {
+	case EEXIST:
+		return 0;
+	case ENOENT:
+		e_error(storage->event,
+			"Directory for binaries was deleted while it was being created");
+		break;
+	case EACCES:
+		e_error(storage->event,
+			"%s",	eacces_error_get_creating("mkdir_parents_chgrp", bin_dir));
+		break;
+	default:
+		e_error(storage->event,
+			"mkdir_parents_chgrp(%s) failed: %m", bin_dir);
+		break;
+	}
+
+	return -1;
+}
+
+int sieve_storage_is_singular(struct sieve_storage *storage)
+{
+	if (storage->v.is_singular == NULL)
+		return 1;
+	return storage->v.is_singular(storage);
+}
+
+int sieve_storage_get_last_change(struct sieve_storage *storage,
+				  time_t *last_change_r)
+{
+	i_assert(storage->v.get_last_change != NULL);
+	return storage->v.get_last_change(storage, last_change_r);
+}
+
+void sieve_storage_set_modified(struct sieve_storage *storage, time_t mtime)
+{
+	if (storage->v.set_modified == NULL)
+		return;
+
+	storage->v.set_modified(storage, mtime);
+}
+
+/*
+ * Script access
+ */
+
+static struct sieve_script *
+sieve_storage_get_script_direct(struct sieve_storage *storage, const char *name,
+				enum sieve_error *error_r)
+{
+	struct sieve_script *script;
+
+	if (error_r != NULL)
+		*error_r = SIEVE_ERROR_NONE;
+	sieve_storage_clear_error(storage);
+
+	/* Validate script name */
+	if (name != NULL && !sieve_script_name_is_valid(name)) {
+		sieve_storage_set_error(storage,
+			SIEVE_ERROR_BAD_PARAMS,
+			"Invalid script name `%s'.",
+			str_sanitize(name, 80));
+		if (error_r != NULL)
+			*error_r = storage->error_code;
+		return NULL;
+	}
+
+	i_assert(storage->v.get_script != NULL);
+	script = storage->v.get_script(storage, name);
+	return script;
+}
+
+struct sieve_script *
+sieve_storage_get_script(struct sieve_storage *storage, const char *name,
+			 enum sieve_error *error_r)
+{
+	struct sieve_instance *svinst = storage->svinst;
+	struct sieve_script *script;
+
+	script = sieve_storage_get_script_direct(storage, name, error_r);
+	if (script == NULL) {
+		/* Error */
+		if (storage->error_code == SIEVE_ERROR_NOT_FOUND &&
+		    (storage->flags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) == 0 &&
+		    storage->default_name != NULL &&
+		    storage->default_location != NULL &&
+		    strcmp(storage->default_name, name) == 0) {
+			/* Not found; if this name maps to the default script,
+			   try to access that instead */
+			i_assert(*storage->default_location != '\0');
+
+			e_debug(storage->event,
+				"Trying default script instead");
+
+			script = sieve_script_create(
+				svinst,	storage->default_location, NULL,
+				error_r);
+			if (script != NULL) {
+				script->storage->is_default = TRUE;
+				script->storage->default_for = storage;
+				sieve_storage_ref(storage);
+			}
+
+		} else if (error_r != NULL) {
+			*error_r = storage->error_code;
+		}
+	}
+	return script;
+}
+
+struct sieve_script *
+sieve_storage_open_script(struct sieve_storage *storage, const char *name,
+			  enum sieve_error *error_r)
+{
+	struct sieve_instance *svinst = storage->svinst;
+	struct sieve_script *script;
+
+	script = sieve_storage_get_script(storage, name, error_r);
+	if (script == NULL)
+		return NULL;
+
+	if (sieve_script_open(script, error_r) >= 0)
+		return script;
+
+	/* Error */
+	sieve_script_unref(&script);
+	script = NULL;
+
+	if (storage->error_code == SIEVE_ERROR_NOT_FOUND &&
+	    (storage->flags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) == 0 &&
+	    storage->default_name != NULL &&
+	    storage->default_location != NULL &&
+	    strcmp(storage->default_name, name) == 0) {
+		/* Not found; if this name maps to the default script,
+		   try to open that instead */
+		i_assert(*storage->default_location != '\0');
+
+		e_debug(storage->event, "Trying default script instead");
+
+		script = sieve_script_create_open(
+			svinst, storage->default_location, NULL, error_r);
+		if (script != NULL) {
+			script->storage->is_default = TRUE;
+			script->storage->default_for = storage;
+			sieve_storage_ref(storage);
+		}
+	}
+	return script;
+}
+
+static int
+sieve_storage_check_script_direct(struct sieve_storage *storage,
+				  const char *name, enum sieve_error *error_r)
+				  ATTR_NULL(3)
+{
+	struct sieve_script *script;
+	enum sieve_error error;
+	int ret;
+
+	if (error_r == NULL)
+		error_r = &error;
+
+	script = sieve_storage_get_script_direct(storage, name, error_r);
+	if (script == NULL)
+		return (*error_r == SIEVE_ERROR_NOT_FOUND ? 0 : -1);
+
+	ret = sieve_script_open(script, error_r);
+	sieve_script_unref(&script);
+	return (ret >= 0 ? 1 : (*error_r == SIEVE_ERROR_NOT_FOUND ? 0 : -1));
+}
+
+int sieve_storage_check_script(struct sieve_storage *storage, const char *name,
+			       enum sieve_error *error_r)
+{
+	struct sieve_script *script;
+	enum sieve_error error;
+
+	if (error_r == NULL)
+		error_r = &error;
+
+	script = sieve_storage_open_script(storage, name, error_r);
+	if (script == NULL)
+		return (*error_r == SIEVE_ERROR_NOT_FOUND ? 0 : -1);
+
+	sieve_script_unref(&script);
+	return 1;
+}
+
+/*
+ * Script sequence
+ */
+
+struct sieve_script_sequence *
+sieve_storage_get_script_sequence(struct sieve_storage *storage,
+				  enum sieve_error *error_r)
+{
+	enum sieve_error error;
+
+	if (error_r != NULL)
+		*error_r = SIEVE_ERROR_NONE;
+	else
+		error_r = &error;
+
+	i_assert(storage->v.get_script_sequence != NULL);
+	return storage->v.get_script_sequence(storage, error_r);
+}
+
+/*
+ * Active script
+ */
+
+static int
+sieve_storage_active_script_do_get_name(struct sieve_storage *storage,
+					const char **name_r, bool *default_r)
+					ATTR_NULL(3)
+{
+	struct sieve_instance *svinst = storage->svinst;
+	enum sieve_error error;
+	int ret;
+
+	if (default_r != NULL)
+		*default_r = FALSE;
+
+	i_assert(storage->v.active_script_get_name != NULL);
+	ret = storage->v.active_script_get_name(storage, name_r);
+
+	if (ret != 0 ||
+	    (storage->flags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) != 0 ||
+	    storage->default_location == NULL ||
+	    storage->default_name == NULL) {
+		return ret;
+	}
+
+	*name_r = storage->default_name;
+
+	ret = sieve_script_check(svinst, storage->default_location,
+				 NULL, &error);
+	if (ret <= 0)
+		return ret;
+
+	if (default_r != NULL)
+		*default_r = TRUE;
+	return 1;
+}
+
+int sieve_storage_active_script_get_name(struct sieve_storage *storage,
+					 const char **name_r)
+{
+	return sieve_storage_active_script_do_get_name(storage, name_r, NULL);
+}
+
+int sieve_storage_active_script_is_default(struct sieve_storage *storage)
+{
+	const char *name;
+	bool is_default = FALSE;
+	int ret;
+
+	ret = sieve_storage_active_script_do_get_name(storage, &name,
+						      &is_default);
+	return (ret < 0 ? -1 : (is_default ? 1 : 0));
+}
+
+struct sieve_script *
+sieve_storage_active_script_open(struct sieve_storage *storage,
+				 enum sieve_error *error_r)
+{
+	struct sieve_instance *svinst = storage->svinst;
+	struct sieve_script *script;
+
+	i_assert(storage->v.active_script_open != NULL);
+	script = storage->v.active_script_open(storage);
+
+	if (script != NULL ||
+	    (storage->flags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) != 0 ||
+	    storage->default_location == NULL) {
+		if (error_r != NULL)
+			*error_r = storage->error_code;
+		return script;
+	}
+
+	/* Try default script location */
+	script = sieve_script_create_open(svinst, storage->default_location,
+					  NULL, error_r);
+	if (script != NULL) {
+		script->storage->is_default = TRUE;
+		script->storage->default_for = storage;
+		sieve_storage_ref(storage);
+	}
+	return script;
+}
+
+int sieve_storage_deactivate(struct sieve_storage *storage, time_t mtime)
+{
+	int ret;
+
+	i_assert((storage->flags & SIEVE_STORAGE_FLAG_READWRITE) != 0);
+
+	i_assert(storage->v.deactivate != NULL);
+	ret = storage->v.deactivate(storage);
+
+	if (ret >= 0) {
+		struct event_passthrough *e =
+			event_create_passthrough(storage->event)->
+			set_name("sieve_storage_deactivated");
+		e_debug(e->event(), "Storage activated");
+
+		sieve_storage_set_modified(storage, mtime);
+		(void)sieve_storage_sync_deactivate(storage);
+	} else {
+		struct event_passthrough *e =
+			event_create_passthrough(storage->event)->
+			add_str("error", storage->error)->
+			set_name("sieve_storage_deactivated");
+		e_debug(e->event(), "Failed to deactivate storage: %s",
+			storage->error);
+	}
+
+	return ret;
+}
+
+int sieve_storage_active_script_get_last_change(struct sieve_storage *storage,
+						time_t *last_change_r)
+{
+	i_assert(storage->v.active_script_get_last_change != NULL);
+
+	return storage->v.active_script_get_last_change(storage, last_change_r);
+}
+
+/*
+ * Listing scripts
+ */
+
+struct sieve_storage_list_context *
+sieve_storage_list_init(struct sieve_storage *storage)
+{
+	struct sieve_storage_list_context *lctx;
+
+	i_assert(storage->v.list_init != NULL);
+	lctx = storage->v.list_init(storage);
+
+	if (lctx != NULL)
+		lctx->storage = storage;
+
+	return lctx;
+}
+
+const char *
+sieve_storage_list_next(struct sieve_storage_list_context *lctx, bool *active_r)
+{
+	struct sieve_storage *storage = lctx->storage;
+	struct sieve_instance *svinst = storage->svinst;
+	const char *scriptname;
+	bool have_default, script_active = FALSE;
+
+	have_default = (storage->default_name != NULL &&
+			storage->default_location != NULL &&
+			(storage->flags &
+			 SIEVE_STORAGE_FLAG_SYNCHRONIZING) == 0);
+
+	i_assert(storage->v.list_next != NULL);
+	scriptname = storage->v.list_next(lctx, &script_active);
+
+	i_assert(!script_active || !lctx->seen_active);
+	if (script_active)
+		lctx->seen_active = TRUE;
+
+	if (scriptname != NULL) {
+		/* Remember when we see that the storage has its own script for
+		   default */
+		if (have_default &&
+		    strcmp(scriptname, storage->default_name) == 0)
+			lctx->seen_default = TRUE;
+
+	} else if (have_default && !lctx->seen_default &&
+		sieve_script_check(svinst, storage->default_location,
+				   NULL, NULL) > 0) {
+
+		/* Return default script at the end if it was not listed
+		   thus far (storage backend has no script under default
+		   name) */
+		scriptname = storage->default_name;
+		lctx->seen_default = TRUE;
+
+		/* Mark default as active if no normal script is active */
+		if (!lctx->seen_active) {
+			script_active = TRUE;
+			lctx->seen_active = TRUE;
+		}
+	}
+
+	if (active_r != NULL)
+		*active_r = script_active;
+	return scriptname;
+}
+
+int sieve_storage_list_deinit(struct sieve_storage_list_context **_lctx)
+{
+	struct sieve_storage_list_context *lctx = *_lctx;
+	struct sieve_storage *storage = lctx->storage;
+	int ret;
+
+	i_assert(storage->v.list_deinit != NULL);
+	ret = storage->v.list_deinit(lctx);
+
+	*_lctx = NULL;
+	return ret;
+}
+
+/*
+ * Saving scripts
+ */
+
+static struct event *
+sieve_storage_save_create_event(struct sieve_storage *storage,
+				const char *scriptname) ATTR_NULL(2)
+{
+	struct event *event;
+
+	event = event_create(storage->event);
+	event_add_str(event, "script_name", scriptname);
+	if (scriptname == NULL) {
+		event_set_append_log_prefix(event, "save: ");
+	} else {
+		event_set_append_log_prefix(
+			event, t_strdup_printf("script `%s': save: ",
+					       scriptname));
+	}
+
+	return event;
+}
+
+static void sieve_storage_save_cleanup(struct sieve_storage_save_context *sctx)
+{
+	if (sctx->scriptobject != NULL)
+		sieve_script_unref(&sctx->scriptobject);
+}
+
+static void sieve_storage_save_deinit(struct sieve_storage_save_context **_sctx)
+{
+	struct sieve_storage_save_context *sctx = *_sctx;
+
+	*_sctx = NULL;
+	if (sctx == NULL)
+		return;
+
+	sieve_storage_save_cleanup(sctx);
+	event_unref(&sctx->event);
+	pool_unref(&sctx->pool);
+}
+
+struct sieve_storage_save_context *
+sieve_storage_save_init(struct sieve_storage *storage, const char *scriptname,
+			struct istream *input)
+{
+	struct sieve_storage_save_context *sctx;
+
+	if (scriptname != NULL) {
+		/* Validate script name */
+		if (!sieve_script_name_is_valid(scriptname)) {
+			sieve_storage_set_error(storage,
+				SIEVE_ERROR_BAD_PARAMS,
+				"Invalid Sieve script name `%s'.",
+				str_sanitize(scriptname, 80));
+			return NULL;
+		}
+	}
+
+	i_assert((storage->flags & SIEVE_STORAGE_FLAG_READWRITE) != 0);
+
+	i_assert(storage->v.save_alloc != NULL);
+	sctx = storage->v.save_alloc(storage);
+	sctx->storage = storage;
+
+	sctx->event = sieve_storage_save_create_event(storage, scriptname);
+
+	struct event_passthrough *e =
+		event_create_passthrough(sctx->event)->
+		set_name("sieve_storage_save_started");
+	e_debug(e->event(), "Started saving script");
+
+	i_assert(storage->v.save_init != NULL);
+	if ((storage->v.save_init(sctx, scriptname, input)) < 0) {
+		struct event_passthrough *e =
+			event_create_passthrough(sctx->event)->
+			add_str("error", storage->error)->
+			set_name("sieve_storage_save_finished");
+		e_debug(e->event(), "Failed to save script: %s",
+			storage->error);
+
+		sieve_storage_save_deinit(&sctx);
+		return NULL;
+	}
+
+	sctx->mtime = (time_t)-1;
+
+	i_assert(sctx->input != NULL);
+
+	return sctx;
+}
+
+int sieve_storage_save_continue(struct sieve_storage_save_context *sctx)
+{
+	struct sieve_storage *storage = sctx->storage;
+	int ret;
+
+	i_assert(storage->v.save_continue != NULL);
+	ret = storage->v.save_continue(sctx);
+	if (ret < 0)
+		sctx->failed = TRUE;
+	return ret;
+}
+
+int sieve_storage_save_finish(struct sieve_storage_save_context *sctx)
+{
+	struct sieve_storage *storage = sctx->storage;
+	int ret;
+
+	i_assert(!sctx->finished);
+	sctx->finished = TRUE;
+
+	i_assert(storage->v.save_finish != NULL);
+	ret = storage->v.save_finish(sctx);
+	if (ret < 0) {
+		struct event_passthrough *e =
+			event_create_passthrough(sctx->event)->
+			add_str("error", storage->error)->
+			set_name("sieve_storage_save_finished");
+		e_debug(e->event(), "Failed to upload script: %s",
+			storage->error);
+
+		sctx->failed = TRUE;
+	}
+	return ret;
+}
+
+void sieve_storage_save_set_mtime(struct sieve_storage_save_context *sctx,
+				  time_t mtime)
+{
+	sctx->mtime = mtime;
+}
+
+struct sieve_script *
+sieve_storage_save_get_tempscript(struct sieve_storage_save_context *sctx)
+{
+	struct sieve_storage *storage = sctx->storage;
+
+	if (sctx->failed)
+		return NULL;
+
+	if (sctx->scriptobject != NULL)
+		return sctx->scriptobject;
+
+	i_assert(storage->v.save_get_tempscript != NULL);
+	sctx->scriptobject = storage->v.save_get_tempscript(sctx);
+
+	i_assert(sctx->scriptobject != NULL ||
+		 storage->error_code != SIEVE_ERROR_NONE);
+	return sctx->scriptobject;
+}
+
+bool sieve_storage_save_will_activate(struct sieve_storage_save_context *sctx)
+{
+	if (sctx->scriptname == NULL)
+		return FALSE;
+
+	if (sctx->active_scriptname == NULL) {
+		const char *scriptname;
+
+		if (sieve_storage_active_script_get_name(sctx->storage,
+							 &scriptname) > 0) {
+			sctx->active_scriptname =
+				p_strdup(sctx->pool, scriptname);
+		}
+	}
+
+ 	/* Is the requested script active? */
+	return (sctx->active_scriptname != NULL &&
+		strcmp(sctx->scriptname, sctx->active_scriptname) == 0);
+}
+
+int sieve_storage_save_commit(struct sieve_storage_save_context **_sctx)
+{
+	struct sieve_storage_save_context *sctx = *_sctx;
+	struct sieve_storage *storage;
+	const char *scriptname;
+	bool default_activate = FALSE;
+	int ret;
+
+	*_sctx = NULL;
+	if (sctx == NULL)
+		return 0;
+
+	storage = sctx->storage;
+	scriptname = sctx->scriptname;
+
+	i_assert(!sctx->failed);
+	i_assert(sctx->finished);
+	i_assert(sctx->scriptname != NULL);
+
+	/* Check whether we're replacing the default active script */
+	if (storage->default_name != NULL &&
+	    storage->default_location != NULL &&
+	    (storage->flags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) == 0 &&
+	    strcmp(sctx->scriptname, storage->default_name) == 0 &&
+	    sieve_storage_save_will_activate(sctx) &&
+	    sieve_storage_check_script_direct(storage, storage->default_name,
+					      NULL) <= 0)
+		default_activate = TRUE;
+
+	sieve_storage_save_cleanup(sctx);
+
+	i_assert(storage->v.save_commit != NULL);
+	ret = storage->v.save_commit(sctx);
+
+	/* Implicitly activate it when we're replacing the default
+	   active script */
+	if (ret >= 0 && default_activate) {
+		struct sieve_script *script;
+		enum sieve_error error;
+
+		script = sieve_storage_open_script(storage, scriptname, &error);
+		if (script == NULL) {
+			/* Somehow not actually saved */
+			ret = (error == SIEVE_ERROR_NOT_FOUND ? 0 : -1);
+		} else if (sieve_script_activate(script, (time_t)-1) < 0) {
+			/* Failed to activate; roll back */
+			ret = -1;
+			(void)sieve_script_delete(script, TRUE);
+		}
+		if (script != NULL)
+			sieve_script_unref(&script);
+
+		if (ret < 0) {
+			e_error(sctx->event,
+				"Failed to implicitly activate script `%s' "
+				"while replacing the default active script",
+				scriptname);
+		}
+	}
+
+	if (ret >= 0) {
+		struct event_passthrough *e =
+			event_create_passthrough(sctx->event)->
+			set_name("sieve_storage_save_finished");
+		e_debug(e->event(), "Finished saving script");
+
+		/* set INBOX mailbox attribute */
+		(void)sieve_storage_sync_script_save(storage, scriptname);
+	} else {
+		struct event_passthrough *e =
+			event_create_passthrough(sctx->event)->
+			add_str("error", storage->error)->
+			set_name("sieve_storage_save_finished");
+
+		e_debug(e->event(), "Failed to save script: %s",
+			storage->error);
+	}
+
+	sieve_storage_save_deinit(&sctx);
+	return ret;
+}
+
+void sieve_storage_save_cancel(struct sieve_storage_save_context **_sctx)
+{
+	struct sieve_storage_save_context *sctx = *_sctx;
+	struct sieve_storage *storage;
+
+	*_sctx = NULL;
+	if (sctx == NULL)
+		return;
+
+	storage = sctx->storage;
+
+	sctx->failed = TRUE;
+
+	sieve_storage_save_cleanup(sctx);
+
+	if (!sctx->finished)
+		(void)sieve_storage_save_finish(sctx);
+
+	struct event_passthrough *e =
+		event_create_passthrough(sctx->event)->
+		add_str("error", "Canceled")->
+		set_name("sieve_storage_save_finished");
+	e_debug(e->event(), "Canceled saving script");
+
+	i_assert(storage->v.save_cancel != NULL);
+	storage->v.save_cancel(sctx);
+
+	sieve_storage_save_deinit(&sctx);
+}
+
+int sieve_storage_save_as_active(struct sieve_storage *storage,
+				 struct istream *input, time_t mtime)
+{
+	struct event *event;
+	int ret;
+
+	event = event_create(storage->event);
+	event_set_append_log_prefix(event, "active script: save: ");
+
+	struct event_passthrough *e =
+		event_create_passthrough(event)->
+		set_name("sieve_storage_save_started");
+	e_debug(e->event(), "Started saving active script");
+
+	i_assert(storage->v.save_as_active != NULL);
+	ret = storage->v.save_as_active(storage, input, mtime);
+
+	if (ret >= 0) {
+		struct event_passthrough *e =
+			event_create_passthrough(event)->
+			set_name("sieve_storage_save_finished");
+		e_debug(e->event(), "Finished saving active script");
+	} else {
+		struct event_passthrough *e =
+			event_create_passthrough(event)->
+			add_str("error", storage->error)->
+			set_name("sieve_storage_save_finished");
+		e_debug(e->event(), "Failed to save active script: %s",
+			storage->error);
+	}
+
+	event_unref(&event);
+	return ret;
+}
+
+int sieve_storage_save_as(struct sieve_storage *storage, struct istream *input,
+			  const char *name)
+{
+	struct event *event;
+	int ret;
+
+	event = sieve_storage_save_create_event(storage, name);
+
+	struct event_passthrough *e =
+		event_create_passthrough(event)->
+		set_name("sieve_storage_save_started");
+	e_debug(e->event(), "Started saving script");
+
+	i_assert(storage->v.save_as != NULL);
+	ret = storage->v.save_as(storage, input, name);
+
+	if (ret >= 0) {
+		struct event_passthrough *e =
+			event_create_passthrough(event)->
+			set_name("sieve_storage_save_finished");
+		e_debug(e->event(), "Finished saving sieve script");
+	} else {
+		struct event_passthrough *e =
+			event_create_passthrough(event)->
+			add_str("error", storage->error)->
+			set_name("sieve_storage_save_finished");
+		e_debug(e->event(), "Failed to save script: %s",
+			storage->error);
+	}
+
+	event_unref(&event);
+	return ret;
+}
+
+/*
+ * Checking quota
+ */
+
+bool sieve_storage_quota_validsize(struct sieve_storage *storage, size_t size,
+				   uint64_t *limit_r)
+{
+	uint64_t max_size;
+
+	max_size = sieve_max_script_size(storage->svinst);
+	if (max_size > 0 && size > max_size) {
+		*limit_r = max_size;
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+uint64_t sieve_storage_quota_max_script_size(struct sieve_storage *storage)
+{
+	return sieve_max_script_size(storage->svinst);
+}
+
+int sieve_storage_quota_havespace(struct sieve_storage *storage,
+				  const char *scriptname, size_t size,
+				  enum sieve_storage_quota *quota_r,
+				  uint64_t *limit_r)
+{
+	*quota_r = SIEVE_STORAGE_QUOTA_NONE;
+	*limit_r = 0;
+
+	/* Check the script size */
+	if (!sieve_storage_quota_validsize(storage, size, limit_r)) {
+		*quota_r = SIEVE_STORAGE_QUOTA_MAXSIZE;
+		return 0;
+	}
+
+	/* Do we need to scan the storage (quota enabled) ? */
+	if (storage->max_scripts == 0 && storage->max_storage == 0)
+		return 1;
+
+	if (storage->v.quota_havespace == NULL)
+		return 1;
+
+	return storage->v.quota_havespace(storage, scriptname, size,
+					  quota_r, limit_r);
+}
+
+/*
+ * Properties
+ */
+
+const char *sieve_storage_location(const struct sieve_storage *storage)
+{
+	return storage->location;
+}
+
+bool sieve_storage_is_default(const struct sieve_storage *storage)
+{
+	return storage->is_default;
+}
+
+/*
+ * Error handling
+ */
+
+void sieve_storage_clear_error(struct sieve_storage *storage)
+{
+	i_free(storage->error);
+	storage->error_code = SIEVE_ERROR_NONE;
+	storage->error = NULL;
+}
+
+void sieve_storage_set_error(struct sieve_storage *storage,
+			     enum sieve_error error, const char *fmt, ...)
+{
+	va_list va;
+
+	sieve_storage_clear_error(storage);
+
+	if (fmt != NULL) {
+		va_start(va, fmt);
+		storage->error = i_strdup_vprintf(fmt, va);
+		va_end(va);
+	}
+
+	storage->error_code = error;
+}
+
+void sieve_storage_copy_error(struct sieve_storage *storage,
+			      const struct sieve_storage *source)
+{
+	sieve_storage_clear_error(storage);
+	storage->error = i_strdup(source->error);
+	storage->error_code = source->error_code;
+}
+
+void sieve_storage_set_internal_error(struct sieve_storage *storage)
+{
+	struct tm *tm;
+	char str[256];
+
+	sieve_storage_clear_error(storage);
+
+	/* critical errors may contain sensitive data, so let user
+	   see only "Internal error" with a timestamp to make it
+	   easier to look from log files the actual error message. */
+	tm = localtime(&ioloop_time);
+
+	storage->error =
+		(strftime(str, sizeof(str), CRITICAL_MSG_STAMP, tm) > 0 ?
+		 i_strdup(str) : i_strdup(CRITICAL_MSG));
+
+	storage->error_code = SIEVE_ERROR_TEMP_FAILURE;
+}
+
+void sieve_storage_set_critical(struct sieve_storage *storage,
+				const char *fmt, ...)
+{
+	va_list va;
+
+	if (fmt != NULL) {
+		if ((storage->flags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) == 0) {
+			va_start(va, fmt);
+			e_error(storage->svinst->event, "%s storage: %s",
+				storage->driver_name,
+				t_strdup_vprintf(fmt, va));
+			va_end(va);
+
+			sieve_storage_set_internal_error(storage);
+
+		} else {
+			sieve_storage_clear_error(storage);
+
+			/* no user is involved while synchronizing, so do it the
+			   normal way */
+			va_start(va, fmt);
+			storage->error = i_strdup_vprintf(fmt, va);
+			va_end(va);
+
+			storage->error_code = SIEVE_ERROR_TEMP_FAILURE;
+		}
+	}
+}
+
+const char *
+sieve_storage_get_last_error(struct sieve_storage *storage,
+			     enum sieve_error *error_r)
+{
+	/* We get here only in error situations, so we have to return some
+	   error. If storage->error is NULL, it means we forgot to set it at
+	   some point..
+	 */
+
+	if (error_r != NULL)
+		*error_r = storage->error_code;
+
+	return storage->error != NULL ? storage->error : "Unknown error";
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-storage.h b/pigeonhole/src/lib-sieve/sieve-storage.h
new file mode 100644
index 0000000..125a86e
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-storage.h
@@ -0,0 +1,187 @@
+#ifndef SIEVE_STORAGE_H
+#define SIEVE_STORAGE_H
+
+#define MAILBOX_ATTRIBUTE_PREFIX_SIEVE \
+	MAILBOX_ATTRIBUTE_PREFIX_DOVECOT_PVT_SERVER"sieve/"
+#define MAILBOX_ATTRIBUTE_PREFIX_SIEVE_FILES \
+	MAILBOX_ATTRIBUTE_PREFIX_SIEVE"files/"
+#define MAILBOX_ATTRIBUTE_SIEVE_DEFAULT \
+	MAILBOX_ATTRIBUTE_PREFIX_SIEVE"default"
+
+#define MAILBOX_ATTRIBUTE_SIEVE_DEFAULT_LINK 'L'
+#define MAILBOX_ATTRIBUTE_SIEVE_DEFAULT_SCRIPT 'S'
+
+/*
+ * Storage object
+ */
+
+enum sieve_storage_flags {
+	/* Storage is opened for read/write access (e.g. ManageSieve) */
+	SIEVE_STORAGE_FLAG_READWRITE         = 0x01,
+	/* This storage is used for synchronization (and not normal ManageSieve)
+	 */
+	SIEVE_STORAGE_FLAG_SYNCHRONIZING     = 0x02
+};
+
+struct sieve_storage;
+
+struct sieve_storage *
+sieve_storage_create(struct sieve_instance *svinst, const char *location,
+		     enum sieve_storage_flags flags, enum sieve_error *error_r)
+		     ATTR_NULL(4);
+struct sieve_storage *
+sieve_storage_create_main(struct sieve_instance *svinst, struct mail_user *user,
+			  enum sieve_storage_flags flags,
+			  enum sieve_error *error_r) ATTR_NULL(4);
+
+void sieve_storage_ref(struct sieve_storage *storage);
+void sieve_storage_unref(struct sieve_storage **_storage);
+
+/*
+ * Script access
+ */
+
+struct sieve_script *
+sieve_storage_get_script(struct sieve_storage *storage, const char *name,
+			 enum sieve_error *error_r) ATTR_NULL(3);
+struct sieve_script *
+sieve_storage_open_script(struct sieve_storage *storage, const char *name,
+			  enum sieve_error *error_r) ATTR_NULL(3);
+int sieve_storage_check_script(struct sieve_storage *storage, const char *name,
+			       enum sieve_error *error_r) ATTR_NULL(3);
+
+/*
+ * Script sequence
+ */
+
+struct sieve_script_sequence *
+sieve_storage_get_script_sequence(struct sieve_storage *storage,
+				  enum sieve_error *error_r);
+
+/*
+ * Active script
+ */
+
+int sieve_storage_active_script_get_name(struct sieve_storage *storage,
+					 const char **name_r);
+
+struct sieve_script *
+sieve_storage_active_script_open(struct sieve_storage *storage,
+				 enum sieve_error *error_r) ATTR_NULL(2);
+
+int sieve_storage_active_script_get_last_change(struct sieve_storage *storage,
+						time_t *last_change_r);
+
+/*
+ * Listing scripts in storage
+ */
+
+struct sieve_storage_list_context;
+
+/* Create a context for listing the scripts in the storage */
+struct sieve_storage_list_context *
+sieve_storage_list_init(struct sieve_storage *storage);
+/* Get the next script in the storage. */
+const char *sieve_storage_list_next(struct sieve_storage_list_context *lctx,
+				    bool *active_r) ATTR_NULL(2);
+/* Destroy the listing context */
+int sieve_storage_list_deinit(struct sieve_storage_list_context **lctx);
+
+/*
+ * Saving scripts in storage
+ */
+
+struct sieve_storage_save_context;
+
+struct sieve_storage_save_context *
+sieve_storage_save_init(struct sieve_storage *storage, const char *scriptname,
+			struct istream *input);
+
+int sieve_storage_save_continue(struct sieve_storage_save_context *sctx);
+
+int sieve_storage_save_finish(struct sieve_storage_save_context *sctx);
+
+struct sieve_script *
+sieve_storage_save_get_tempscript(struct sieve_storage_save_context *sctx);
+
+bool sieve_storage_save_will_activate(struct sieve_storage_save_context *sctx);
+
+void sieve_storage_save_set_mtime(struct sieve_storage_save_context *sctx,
+				  time_t mtime);
+
+void sieve_storage_save_cancel(struct sieve_storage_save_context **sctx);
+
+int sieve_storage_save_commit(struct sieve_storage_save_context **sctx);
+
+int sieve_storage_save_as(struct sieve_storage *storage, struct istream *input,
+			  const char *name);
+
+/* Saves input directly as a regular file at the active script path.
+ * This is needed for the doveadm-sieve plugin.
+ */
+int sieve_storage_save_as_active(struct sieve_storage *storage,
+				 struct istream *input, time_t mtime);
+
+/*
+ * Management
+ */
+
+int sieve_storage_deactivate(struct sieve_storage *storage, time_t mtime);
+
+/*
+ * Storage quota
+ */
+
+enum sieve_storage_quota {
+	SIEVE_STORAGE_QUOTA_NONE,
+	SIEVE_STORAGE_QUOTA_MAXSIZE,
+	SIEVE_STORAGE_QUOTA_MAXSCRIPTS,
+	SIEVE_STORAGE_QUOTA_MAXSTORAGE
+};
+
+bool sieve_storage_quota_validsize(struct sieve_storage *storage, size_t size,
+				   uint64_t *limit_r);
+
+uint64_t sieve_storage_quota_max_script_size(struct sieve_storage *storage);
+
+int sieve_storage_quota_havespace(struct sieve_storage *storage,
+				  const char *scriptname, size_t size,
+				  enum sieve_storage_quota *quota_r,
+				  uint64_t *limit_r);
+
+/*
+ * Properties
+ */
+
+const char *sieve_storage_location(const struct sieve_storage *storage)
+	ATTR_PURE;
+bool sieve_storage_is_default(const struct sieve_storage *storage) ATTR_PURE;
+
+int sieve_storage_is_singular(struct sieve_storage *storage);
+
+/*
+ * Error handling
+ */
+
+void sieve_storage_clear_error(struct sieve_storage *storage);
+
+void sieve_storage_set_error(struct sieve_storage *storage,
+			     enum sieve_error error, const char *fmt, ...)
+			     ATTR_FORMAT(3, 4);
+void sieve_storage_set_critical(struct sieve_storage *storage,
+				const char *fmt, ...) ATTR_FORMAT(2, 3);
+
+const char *sieve_storage_get_last_error(struct sieve_storage *storage,
+					 enum sieve_error *error_r)
+					 ATTR_NULL(2);
+
+/*
+ *
+ */
+
+int sieve_storage_get_last_change(struct sieve_storage *storage,
+				  time_t *last_change_r);
+void sieve_storage_set_modified(struct sieve_storage *storage,
+				time_t mtime);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-stringlist.c b/pigeonhole/src/lib-sieve/sieve-stringlist.c
new file mode 100644
index 0000000..17b7d5c
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-stringlist.c
@@ -0,0 +1,276 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "array.h"
+#include "str.h"
+
+#include "sieve-common.h"
+#include "sieve-stringlist.h"
+
+/*
+ * Default implementation
+ */
+
+int sieve_stringlist_read_all
+(struct sieve_stringlist *strlist, pool_t pool,
+	const char * const **list_r)
+{
+	if ( strlist->read_all == NULL ) {
+		ARRAY(const char *) items;
+		string_t *item;
+		int ret;
+
+		sieve_stringlist_reset(strlist);
+
+		p_array_init(&items, pool, 4);
+
+		item = NULL;
+		while ( (ret=sieve_stringlist_next_item(strlist, &item)) > 0 ) {
+			const char *stritem = p_strdup(pool, str_c(item));
+
+			array_append(&items, &stritem, 1);
+		}
+
+		(void)array_append_space(&items);
+		*list_r = array_idx(&items, 0);
+
+		return ( ret < 0 ? -1 : 1 );
+	}
+
+	return strlist->read_all(strlist, pool, list_r);
+}
+
+int sieve_stringlist_get_length
+(struct sieve_stringlist *strlist)
+{
+	if ( strlist->get_length == NULL ) {
+		string_t *item;
+		int count = 0;
+		int ret;
+
+		sieve_stringlist_reset(strlist);
+		while ( (ret=sieve_stringlist_next_item(strlist, &item)) > 0 ) {
+			count++;
+		}
+		sieve_stringlist_reset(strlist);
+
+		return ( ret < 0 ? -1 : count );
+	}
+
+	return strlist->get_length(strlist);
+}
+
+/*
+ * Single Stringlist
+ */
+
+/* Object */
+
+static int sieve_single_stringlist_next_item
+	(struct sieve_stringlist *_strlist, string_t **str_r);
+static void sieve_single_stringlist_reset
+	(struct sieve_stringlist *_strlist);
+static int sieve_single_stringlist_get_length
+	(struct sieve_stringlist *_strlist);
+
+struct sieve_single_stringlist {
+	struct sieve_stringlist strlist;
+
+	string_t *value;
+
+	bool end:1;
+	bool count_empty:1;
+};
+
+struct sieve_stringlist *sieve_single_stringlist_create
+(const struct sieve_runtime_env *renv, string_t *str, bool count_empty)
+{
+	struct sieve_single_stringlist *strlist;
+
+	strlist = t_new(struct sieve_single_stringlist, 1);
+	strlist->strlist.runenv = renv;
+	strlist->strlist.exec_status = SIEVE_EXEC_OK;
+	strlist->strlist.next_item = sieve_single_stringlist_next_item;
+	strlist->strlist.reset = sieve_single_stringlist_reset;
+	strlist->strlist.get_length = sieve_single_stringlist_get_length;
+	strlist->count_empty = count_empty;
+	strlist->value = str;
+
+	return &strlist->strlist;
+}
+
+struct sieve_stringlist *sieve_single_stringlist_create_cstr
+(const struct sieve_runtime_env *renv, const char *cstr, bool count_empty)
+{
+	string_t *str = t_str_new_const(cstr, strlen(cstr));
+
+	return sieve_single_stringlist_create(renv, str, count_empty);
+}
+
+/* Implementation */
+
+static int sieve_single_stringlist_next_item
+(struct sieve_stringlist *_strlist, string_t **str_r)
+{
+	struct sieve_single_stringlist *strlist =
+		(struct sieve_single_stringlist *)_strlist;
+
+	if ( strlist->end ) {
+		*str_r = NULL;
+		return 0;
+	}
+
+	*str_r = strlist->value;
+	strlist->end = TRUE;
+	return 1;
+}
+
+static void sieve_single_stringlist_reset
+(struct sieve_stringlist *_strlist)
+{
+	struct sieve_single_stringlist *strlist =
+		(struct sieve_single_stringlist *)_strlist;
+
+	strlist->end = FALSE;
+}
+
+static int sieve_single_stringlist_get_length
+(struct sieve_stringlist *_strlist)
+{
+	struct sieve_single_stringlist *strlist =
+		(struct sieve_single_stringlist *)_strlist;
+
+	return ( strlist->count_empty || str_len(strlist->value) > 0 ? 1 : 0 );
+}
+
+/*
+ * Index Stringlist
+ */
+
+/* Object */
+
+static int sieve_index_stringlist_next_item
+	(struct sieve_stringlist *_strlist, string_t **str_r);
+static void sieve_index_stringlist_reset
+	(struct sieve_stringlist *_strlist);
+static int sieve_index_stringlist_get_length
+	(struct sieve_stringlist *_strlist);
+static void sieve_index_stringlist_set_trace
+	(struct sieve_stringlist *strlist, bool trace);
+
+struct sieve_index_stringlist {
+	struct sieve_stringlist strlist;
+
+	struct sieve_stringlist *source;
+
+	int index;
+	bool end:1;
+};
+
+struct sieve_stringlist *sieve_index_stringlist_create
+(const struct sieve_runtime_env *renv, struct sieve_stringlist *source,
+	int index)
+{
+	struct sieve_index_stringlist *strlist;
+
+	strlist = t_new(struct sieve_index_stringlist, 1);
+	strlist->strlist.runenv = renv;
+	strlist->strlist.exec_status = SIEVE_EXEC_OK;
+	strlist->strlist.next_item = sieve_index_stringlist_next_item;
+	strlist->strlist.reset = sieve_index_stringlist_reset;
+	strlist->strlist.get_length = sieve_index_stringlist_get_length;
+	strlist->strlist.set_trace = sieve_index_stringlist_set_trace;
+	strlist->source = source;
+	strlist->index = index;
+
+	return &strlist->strlist;
+}
+
+/* Implementation */
+
+static int sieve_index_stringlist_next_item
+(struct sieve_stringlist *_strlist, string_t **str_r)
+{
+	struct sieve_index_stringlist *strlist =
+		(struct sieve_index_stringlist *)_strlist;
+	int index, ret;
+
+	if ( strlist->end ) {
+		*str_r = NULL;
+		return 0;
+	}
+
+	if ( strlist->index < 0 ) {
+		int len = sieve_stringlist_get_length(strlist->source);
+		if (len < 0) {
+			_strlist->exec_status = strlist->source->exec_status;
+			return -1;
+		}
+
+		if (len < -strlist->index) {
+			*str_r = NULL;
+			strlist->end = TRUE;
+			return 0;
+		}
+		index = len + 1 + strlist->index;
+	} else {
+		index = strlist->index;
+	}
+
+	i_assert(index > 0);
+	while ( index > 0 ) {
+		if ( (ret=sieve_stringlist_next_item(strlist->source, str_r)) <= 0 ) {
+			if (ret < 0)
+				_strlist->exec_status = strlist->source->exec_status;
+			return ret;
+		}
+	
+		index--;
+	}
+		
+	strlist->end = TRUE;
+	return 1;
+}
+
+static void sieve_index_stringlist_reset
+(struct sieve_stringlist *_strlist)
+{
+	struct sieve_index_stringlist *strlist =
+		(struct sieve_index_stringlist *)_strlist;
+
+	sieve_stringlist_reset(strlist->source);
+	strlist->end = FALSE;
+}
+
+static int sieve_index_stringlist_get_length
+(struct sieve_stringlist *_strlist)
+{
+	struct sieve_index_stringlist *strlist =
+		(struct sieve_index_stringlist *)_strlist;
+	int len;
+
+	len = sieve_stringlist_get_length(strlist->source);
+	if (len < 0) {
+		_strlist->exec_status = strlist->source->exec_status;
+		return -1;
+	}
+
+	if ( strlist->index < 0 ) {
+		if ( -strlist->index >= len )
+			return 0;
+	} else if ( strlist->index >= len ) {
+			return 0;
+	}
+
+	return 1;
+}
+
+static void sieve_index_stringlist_set_trace
+(struct sieve_stringlist *_strlist, bool trace)
+{
+	struct sieve_index_stringlist *strlist =
+		(struct sieve_index_stringlist *)_strlist;
+
+	sieve_stringlist_set_trace(strlist->source, trace);
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-stringlist.h b/pigeonhole/src/lib-sieve/sieve-stringlist.h
new file mode 100644
index 0000000..1909b7a
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-stringlist.h
@@ -0,0 +1,74 @@
+#ifndef SIEVE_STRINGLIST_H
+#define SIEVE_STRINGLIST_H
+
+/*
+ * Stringlist API
+ */
+
+struct sieve_stringlist {
+	int (*next_item)
+		(struct sieve_stringlist *strlist, string_t **str_r);
+	void (*reset)
+		(struct sieve_stringlist *strlist);
+	int (*get_length)
+		(struct sieve_stringlist *strlist);
+
+	int (*read_all)
+		(struct sieve_stringlist *strlist, pool_t pool,
+			const char * const **list_r);
+
+	void (*set_trace)
+		(struct sieve_stringlist *strlist, bool trace);
+
+	const struct sieve_runtime_env *runenv;
+	int exec_status;
+
+	bool trace:1;
+};
+
+static inline void sieve_stringlist_set_trace
+(struct sieve_stringlist *strlist, bool trace)
+{
+	strlist->trace = trace;
+
+	if ( strlist->set_trace != NULL )
+		strlist->set_trace(strlist, trace);
+}
+
+static inline int sieve_stringlist_next_item
+(struct sieve_stringlist *strlist, string_t **str_r)
+{
+	return strlist->next_item(strlist, str_r);
+}
+
+static inline void sieve_stringlist_reset
+(struct sieve_stringlist *strlist)
+{
+	strlist->reset(strlist);
+}
+
+int sieve_stringlist_get_length
+	(struct sieve_stringlist *strlist);
+
+int sieve_stringlist_read_all
+	(struct sieve_stringlist *strlist, pool_t pool,
+		const char * const **list_r);
+
+/*
+ * Single Stringlist
+ */
+
+struct sieve_stringlist *sieve_single_stringlist_create
+	(const struct sieve_runtime_env *renv, string_t *str, bool count_empty);
+struct sieve_stringlist *sieve_single_stringlist_create_cstr
+(const struct sieve_runtime_env *renv, const char *cstr, bool count_empty);
+
+/*
+ * Index Stringlist
+ */
+
+struct sieve_stringlist *sieve_index_stringlist_create
+	(const struct sieve_runtime_env *renv, struct sieve_stringlist *source,
+		int index);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-types.h b/pigeonhole/src/lib-sieve/sieve-types.h
new file mode 100644
index 0000000..439b26e
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-types.h
@@ -0,0 +1,316 @@
+#ifndef SIEVE_TYPES_H
+#define SIEVE_TYPES_H
+
+#include "lib.h"
+#include "smtp-address.h"
+
+#include <stdio.h>
+
+/*
+ * Forward declarations
+ */
+
+struct smtp_params_mail;
+struct smtp_params_rcpt;
+
+struct sieve_instance;
+struct sieve_callbacks;
+
+struct sieve_script;
+struct sieve_binary;
+
+struct sieve_message_data;
+struct sieve_script_env;
+struct sieve_exec_status;
+struct sieve_trace_log;
+
+/*
+ * System environment
+ */
+
+enum sieve_flag {
+	/* Relative paths are resolved to HOME */
+	SIEVE_FLAG_HOME_RELATIVE = (1 << 0)
+};
+
+/* Sieve evaluation can be performed at various different points as messages
+   are processed. */
+enum sieve_env_location {
+	/* Unknown */
+	SIEVE_ENV_LOCATION_UNKNOWN = 0,
+	/* "MDA" - evaluation is being performed by a Mail Delivery Agent */
+	SIEVE_ENV_LOCATION_MDA,
+	/* "MTA" - the Sieve script is being evaluated by a Message Transfer Agent */
+	SIEVE_ENV_LOCATION_MTA,
+	/* "MS"  - evaluation is being performed by a Message Store */
+	SIEVE_ENV_LOCATION_MS
+};
+
+/* The point relative to final delivery where the Sieve script is being
+   evaluated. */
+enum sieve_delivery_phase {
+	SIEVE_DELIVERY_PHASE_UNKNOWN = 0,
+	SIEVE_DELIVERY_PHASE_PRE,
+	SIEVE_DELIVERY_PHASE_DURING,
+	SIEVE_DELIVERY_PHASE_POST,
+};
+
+struct sieve_environment {
+	const char *hostname;
+	const char *domainname;
+
+	const char *base_dir;
+	const char *username;
+	const char *home_dir;
+	const char *temp_dir;
+
+	struct event *event_parent;
+
+	enum sieve_flag flags;
+	enum sieve_env_location location;
+	enum sieve_delivery_phase delivery_phase;
+};
+
+/*
+ * Callbacks
+ */
+
+struct sieve_callbacks {
+	const char *(*get_homedir)(void *context);
+	const char *(*get_setting)(void *context, const char *identifier);
+};
+
+/*
+ * Errors
+ */
+
+enum sieve_error {
+	SIEVE_ERROR_NONE = 0,
+
+	/* Temporary internal error */
+	SIEVE_ERROR_TEMP_FAILURE,
+	/* It's not possible to do the wanted operation */
+	SIEVE_ERROR_NOT_POSSIBLE,
+	/* Invalid parameters (eg. script name not valid) */
+	SIEVE_ERROR_BAD_PARAMS,
+	/* No permission to do the request */
+	SIEVE_ERROR_NO_PERMISSION,
+	/* Out of disk space */
+	SIEVE_ERROR_NO_QUOTA,
+	/* Item (e.g. script or binary) cannot be found */
+	SIEVE_ERROR_NOT_FOUND,
+	/* Item (e.g. script or binary) already exists */
+	SIEVE_ERROR_EXISTS,
+	/* Referenced item (e.g. script or binary) is not valid or currupt */
+	SIEVE_ERROR_NOT_VALID,
+	/* Not allowed to perform the operation because the item is in active use */
+	SIEVE_ERROR_ACTIVE,
+	/* Operation exceeds resource limit */
+	SIEVE_ERROR_RESOURCE_LIMIT,
+};
+
+/*
+ * Compile flags
+ */
+
+enum sieve_compile_flags {
+	/* No global extensions are allowed
+	 *  (as marked by sieve_global_extensions setting)
+	 */
+	SIEVE_COMPILE_FLAG_NOGLOBAL = (1<<0),
+	/* Script is being uploaded (usually through ManageSieve) */
+	SIEVE_COMPILE_FLAG_UPLOADED = (1<<1),
+	/* Script is being activated (usually through ManageSieve) */
+	SIEVE_COMPILE_FLAG_ACTIVATED = (1<<2),
+	/* Compiled for environment with no access to envelope */
+	SIEVE_COMPILE_FLAG_NO_ENVELOPE = (1<<3)
+};
+
+/*
+ * Message data
+ *
+ * - The mail message + envelope data
+ */
+
+struct sieve_message_data {
+	struct mail *mail;
+
+	const char *auth_user;
+	const char *id;
+
+	struct {
+		const struct smtp_address *mail_from;
+		const struct smtp_params_mail *mail_params;
+
+		const struct smtp_address *rcpt_to;
+		const struct smtp_params_rcpt *rcpt_params;
+	} envelope;
+};
+
+/*
+ * Runtime flags
+ */
+
+enum sieve_execute_flags {
+	/* No global extensions are allowed
+	 *  (as marked by sieve_global_extensions setting)
+	 */
+	SIEVE_EXECUTE_FLAG_NOGLOBAL = (1<<0),
+	/* Do not execute (implicit keep) at the end */
+	SIEVE_EXECUTE_FLAG_DEFER_KEEP = (1<<1),
+	/* There is no envelope */
+	SIEVE_EXECUTE_FLAG_NO_ENVELOPE = (1<<2),
+	/* Skip sending responses */
+	SIEVE_EXECUTE_FLAG_SKIP_RESPONSES = (1<<3),
+	/* Log result as info (when absent, only debug logging is performed) */
+	SIEVE_EXECUTE_FLAG_LOG_RESULT = (1<<4),
+};
+
+/*
+ * Runtime trace settings
+ */
+
+typedef enum {
+	SIEVE_TRLVL_NONE = 0,
+	SIEVE_TRLVL_ACTIONS,
+	SIEVE_TRLVL_COMMANDS,
+	SIEVE_TRLVL_TESTS,
+	SIEVE_TRLVL_MATCHING
+} sieve_trace_level_t;
+
+enum {
+	SIEVE_TRFLG_DEBUG = (1 << 0),
+	SIEVE_TRFLG_ADDRESSES = (1 << 1)
+};
+
+struct sieve_trace_config {
+	sieve_trace_level_t level;
+	unsigned int flags;
+};
+
+/*
+ * Duplicate checking
+ */
+
+enum sieve_duplicate_check_result {
+	SIEVE_DUPLICATE_CHECK_RESULT_EXISTS = 1,
+	SIEVE_DUPLICATE_CHECK_RESULT_NOT_FOUND = 0,
+	SIEVE_DUPLICATE_CHECK_RESULT_FAILURE = -1,
+	SIEVE_DUPLICATE_CHECK_RESULT_TEMP_FAILURE = -2,
+};
+
+/*
+ * Script environment
+ *
+ * - Environment for currently executing script
+ */
+
+struct sieve_script_env {
+	/* Mail-related */
+	struct mail_user *user;
+	const struct message_address *postmaster_address;
+	const char *default_mailbox;
+	bool mailbox_autocreate;
+	bool mailbox_autosubscribe;
+
+	/* External context data */
+
+	void *script_context;
+
+	/* Callbacks */
+
+	/* Interface for sending mail */
+	void *(*smtp_start)
+		(const struct sieve_script_env *senv,
+			const struct smtp_address *mail_from);
+	/* Add a new recipient */
+	void (*smtp_add_rcpt)	
+		(const struct sieve_script_env *senv, void *handle,
+			const struct smtp_address *rcpt_to);
+	/* Get an output stream where the message can be written to. The recipients
+	   must already be added before calling this. */
+	struct ostream *(*smtp_send)
+		(const struct sieve_script_env *senv, void *handle);
+	/* Abort the SMTP transaction after smtp_send() is already issued */
+	void (*smtp_abort)
+		(const struct sieve_script_env *senv, void *handle);
+	/* Returns 1 on success, 0 on permanent failure, -1 on temporary failure. */
+	int (*smtp_finish)
+		(const struct sieve_script_env *senv, void *handle,
+			const char **error_r);
+
+	/* Interface for marking and checking duplicates */
+	void *(*duplicate_transaction_begin)(
+		const struct sieve_script_env *senv);
+	void (*duplicate_transaction_commit)(void **_dup_trans);
+	void (*duplicate_transaction_rollback)(void **_dup_trans);
+
+	enum sieve_duplicate_check_result
+	(*duplicate_check)(void *dup_trans, const struct sieve_script_env *senv,
+			   const void *id, size_t id_size);
+	void (*duplicate_mark)(void *dup_trans,
+			       const struct sieve_script_env *senv,
+			       const void *id, size_t id_size, time_t time);
+
+	/* Interface for rejecting mail */
+	int (*reject_mail)(const struct sieve_script_env *senv,
+		const struct smtp_address *recipient, const char *reason);
+
+	/* Interface for amending result messages */
+	const char *
+	(*result_amend_log_message)(const struct sieve_script_env *senv,
+				    enum log_type log_type,
+				    const char *message);
+
+	/* Execution status record */
+	struct sieve_exec_status *exec_status;
+
+	/* Runtime trace*/
+	struct sieve_trace_log *trace_log;
+	struct sieve_trace_config trace_config;
+};
+
+#define SIEVE_SCRIPT_DEFAULT_MAILBOX(senv) \
+	(senv->default_mailbox == NULL ? "INBOX" : senv->default_mailbox )
+
+/*
+ * Resource usage
+ */
+
+struct sieve_resource_usage {
+	/* The total amount of system + user CPU time consumed while executing
+	   the Sieve script. */
+	unsigned int cpu_time_msecs;
+};
+
+/*
+ * Script execution status
+ */
+
+struct sieve_exec_status {
+	struct mail_storage *last_storage;
+
+	struct sieve_resource_usage resource_usage;
+
+	bool message_saved:1;
+	bool message_forwarded:1;
+	bool tried_default_save:1;
+	bool keep_original:1;
+	bool store_failed:1;
+	bool significant_action_executed:1;
+};
+
+/*
+ * Execution exit codes
+ */
+
+enum sieve_execution_exitcode {
+	SIEVE_EXEC_OK         	        = 1,
+	SIEVE_EXEC_FAILURE              = 0,
+	SIEVE_EXEC_TEMP_FAILURE         = -1,
+	SIEVE_EXEC_BIN_CORRUPT          = -2,
+	SIEVE_EXEC_KEEP_FAILED          = -3,
+	SIEVE_EXEC_RESOURCE_LIMIT       = -4,
+};
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve-validator.c b/pigeonhole/src/lib-sieve/sieve-validator.c
new file mode 100644
index 0000000..bef4a7d
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-validator.c
@@ -0,0 +1,1706 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "array.h"
+#include "buffer.h"
+#include "mempool.h"
+#include "hash.h"
+
+#include "sieve-common.h"
+#include "sieve-extensions.h"
+#include "sieve-script.h"
+#include "sieve-ast.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+
+#include "sieve-comparators.h"
+#include "sieve-address-parts.h"
+
+/*
+ * Forward declarations
+ */
+
+static void
+sieve_validator_register_core_commands(struct sieve_validator *valdtr);
+static void
+sieve_validator_register_core_tests(struct sieve_validator *valdtr);
+
+/*
+ * Types
+ */
+
+/* Tag registration */
+
+struct sieve_tag_registration {
+	const struct sieve_argument_def *tag_def;
+	const struct sieve_extension *ext;
+
+	const char *identifier;
+	int id_code;
+};
+
+/* Command registration */
+
+struct sieve_command_registration {
+	const struct sieve_command_def *cmd_def;
+	const struct sieve_extension *ext;
+
+	ARRAY(struct sieve_tag_registration *) normal_tags;
+	ARRAY(struct sieve_tag_registration *) instanced_tags;
+	ARRAY(struct sieve_tag_registration *) persistent_tags;
+};
+
+/* Default (literal) arguments */
+
+struct sieve_default_argument {
+	const struct sieve_argument_def *arg_def;
+	const struct sieve_extension *ext;
+
+	struct sieve_default_argument *overrides;
+};
+
+/*
+ * Validator extension
+ */
+
+struct sieve_validator_extension_reg {
+	const struct sieve_validator_extension *valext;
+	const struct sieve_extension *ext;
+	struct sieve_ast_argument *arg;
+	void *context;
+
+	bool loaded:1;
+	bool required:1;
+};
+
+/*
+ * Validator
+ */
+
+struct sieve_validator {
+	pool_t pool;
+
+	struct sieve_instance *svinst;
+	struct sieve_ast *ast;
+	struct sieve_script *script;
+	enum sieve_compile_flags flags;
+
+	struct sieve_error_handler *ehandler;
+
+	bool finished_require;
+
+	/* Registries */
+
+	HASH_TABLE(const char *, struct sieve_command_registration *) commands;
+
+	ARRAY(struct sieve_validator_extension_reg) extensions;
+
+	/* This is currently a wee bit ugly and needs more thought */
+	struct sieve_default_argument default_arguments[SAT_COUNT];
+
+	/* Default argument processing state (FIXME: ugly) */
+	struct sieve_default_argument *current_defarg;
+	enum sieve_argument_type current_defarg_type;
+	bool current_defarg_constant;
+};
+
+/*
+ * Validator object
+ */
+
+struct sieve_validator *
+sieve_validator_create(struct sieve_ast *ast,
+		       struct sieve_error_handler *ehandler,
+		       enum sieve_compile_flags flags)
+{
+	pool_t pool;
+	struct sieve_validator *valdtr;
+	const struct sieve_extension *const *ext_preloaded;
+	unsigned int i, ext_count;
+
+	pool = pool_alloconly_create("sieve_validator", 16384);
+	valdtr = p_new(pool, struct sieve_validator, 1);
+	valdtr->pool = pool;
+
+	valdtr->ehandler = ehandler;
+	sieve_error_handler_ref(ehandler);
+
+	valdtr->ast = ast;
+	sieve_ast_ref(ast);
+
+	valdtr->script = sieve_ast_script(ast);
+	valdtr->svinst = sieve_script_svinst(valdtr->script);
+	valdtr->flags = flags;
+
+	/* Setup default arguments */
+	valdtr->default_arguments[SAT_NUMBER].arg_def = &number_argument;
+	valdtr->default_arguments[SAT_NUMBER].ext = NULL;
+	valdtr->default_arguments[SAT_VAR_STRING].arg_def = &string_argument;
+	valdtr->default_arguments[SAT_VAR_STRING].ext = NULL;
+	valdtr->default_arguments[SAT_CONST_STRING].arg_def = &string_argument;
+	valdtr->default_arguments[SAT_CONST_STRING].ext = NULL;
+	valdtr->default_arguments[SAT_STRING_LIST].arg_def = &string_list_argument;
+	valdtr->default_arguments[SAT_STRING_LIST].ext = NULL;
+
+	/* Setup storage for extension contexts */
+	p_array_init(&valdtr->extensions, pool,
+		     sieve_extensions_get_count(valdtr->svinst));
+
+	/* Setup command registry */
+	hash_table_create(&valdtr->commands, pool, 0, strcase_hash, strcasecmp);
+	sieve_validator_register_core_commands(valdtr);
+	sieve_validator_register_core_tests(valdtr);
+
+	/* Pre-load core language features implemented as 'extensions' */
+	ext_preloaded =
+		sieve_extensions_get_preloaded(valdtr->svinst, &ext_count);
+	for (i = 0; i < ext_count; i++) {
+		const struct sieve_extension_def *ext_def =
+			ext_preloaded[i]->def;
+
+		if (ext_def != NULL && ext_def->validator_load != NULL)
+			(void)ext_def->validator_load(ext_preloaded[i], valdtr);
+	}
+
+	return valdtr;
+}
+
+void sieve_validator_free(struct sieve_validator **valdtr)
+{
+	const struct sieve_validator_extension_reg *extrs;
+	unsigned int ext_count, i;
+
+	hash_table_destroy(&(*valdtr)->commands);
+	sieve_ast_unref(&(*valdtr)->ast);
+
+	sieve_error_handler_unref(&(*valdtr)->ehandler);
+
+	/* Signal registered extensions that the validator is being destroyed */
+	extrs = array_get(&(*valdtr)->extensions, &ext_count);
+	for (i = 0; i < ext_count; i++) {
+		if (extrs[i].valext != NULL && extrs[i].valext->free != NULL)
+			extrs[i].valext->free(extrs[i].ext, *valdtr,
+					      extrs[i].context);
+	}
+
+	pool_unref(&(*valdtr)->pool);
+
+	*valdtr = NULL;
+}
+
+/*
+ * Accessors
+ */
+
+// FIXME: build validate environment
+
+pool_t sieve_validator_pool(struct sieve_validator *valdtr)
+{
+	return valdtr->pool;
+}
+
+struct sieve_error_handler *
+sieve_validator_error_handler(struct sieve_validator *valdtr)
+{
+	return valdtr->ehandler;
+}
+
+struct sieve_ast *sieve_validator_ast(struct sieve_validator *valdtr)
+{
+	return valdtr->ast;
+}
+
+struct sieve_script *sieve_validator_script(struct sieve_validator *valdtr)
+{
+	return valdtr->script;
+}
+
+struct sieve_instance *sieve_validator_svinst(struct sieve_validator *valdtr)
+{
+	return valdtr->svinst;
+}
+
+enum sieve_compile_flags
+sieve_validator_compile_flags(struct sieve_validator *valdtr)
+{
+	return valdtr->flags;
+}
+
+/*
+ * Command registry
+ */
+
+/* Dummy command object to mark unknown commands in the registry */
+
+static bool _cmd_unknown_validate(struct sieve_validator *valdtr ATTR_UNUSED,
+				  struct sieve_command *cmd ATTR_UNUSED)
+{
+	i_unreached();
+	return FALSE;
+}
+
+static const struct sieve_command_def unknown_command = {
+	.identifier = "",
+	.type = SCT_NONE,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = _cmd_unknown_validate
+};
+
+/* Registration of the core commands of the language */
+
+static void
+sieve_validator_register_core_tests(struct sieve_validator *valdtr)
+{
+	unsigned int i;
+
+	for (i = 0; i < sieve_core_tests_count; i++) {
+		sieve_validator_register_command(valdtr, NULL,
+						 sieve_core_tests[i]);
+	}
+}
+
+static void
+sieve_validator_register_core_commands(struct sieve_validator *valdtr)
+{
+	unsigned int i;
+
+	for (i = 0; i < sieve_core_commands_count; i++) {
+		sieve_validator_register_command(valdtr, NULL,
+						 sieve_core_commands[i]);
+	}
+}
+
+/* Registry functions */
+
+static struct sieve_command_registration *
+sieve_validator_find_command_registration(struct sieve_validator *valdtr,
+					  const char *command)
+{
+	return hash_table_lookup(valdtr->commands, command);
+}
+
+static struct sieve_command_registration *
+_sieve_validator_register_command(struct sieve_validator *valdtr,
+				  const struct sieve_extension *ext,
+				  const struct sieve_command_def *cmd_def,
+				  const char *identifier)
+{
+	struct sieve_command_registration *cmd_reg =
+		p_new(valdtr->pool, struct sieve_command_registration, 1);
+
+	cmd_reg->cmd_def = cmd_def;
+	cmd_reg->ext = ext;
+
+	hash_table_insert(valdtr->commands, identifier, cmd_reg);
+
+	return cmd_reg;
+}
+
+void sieve_validator_register_command(struct sieve_validator *valdtr,
+				      const struct sieve_extension *ext,
+				      const struct sieve_command_def *cmd_def)
+{
+	struct sieve_command_registration *cmd_reg =
+		sieve_validator_find_command_registration(
+			valdtr, cmd_def->identifier);
+
+	if (cmd_reg == NULL) {
+		cmd_reg = _sieve_validator_register_command(
+			valdtr, ext, cmd_def, cmd_def->identifier);
+	} else {
+		cmd_reg->cmd_def = cmd_def;
+		cmd_reg->ext = ext;
+	}
+
+	if (cmd_def->registered != NULL)
+		cmd_def->registered(valdtr, ext, cmd_reg);
+}
+
+static void
+sieve_validator_register_unknown_command(struct sieve_validator *valdtr,
+					 const char *command)
+{
+	struct sieve_command_registration *cmd_reg =
+		sieve_validator_find_command_registration(valdtr, command);
+
+	if (cmd_reg == NULL) {
+		(void)_sieve_validator_register_command(
+			valdtr, NULL, &unknown_command, command);
+	} else {
+		i_assert(cmd_reg->cmd_def == NULL);
+		cmd_reg->cmd_def = &unknown_command;
+	}
+}
+
+/*const struct sieve_command *sieve_validator_find_command
+(struct sieve_validator *valdtr, const char *command)
+{
+  struct sieve_command_registration *cmd_reg =
+  	sieve_validator_find_command_registration(valdtr, command);
+
+  return ( record == NULL ? NULL : record->command );
+}*/
+
+/*
+ * Per-command tagged argument registry
+ */
+
+/* Dummy argument object to mark unknown arguments in the registry */
+
+static bool
+_unknown_tag_validate(struct sieve_validator *valdtr ATTR_UNUSED,
+		      struct sieve_ast_argument **arg ATTR_UNUSED,
+		      struct sieve_command *tst ATTR_UNUSED)
+{
+	i_unreached();
+	return FALSE;
+}
+
+static const struct sieve_argument_def _unknown_tag = {
+	.identifier = "",
+	.validate = _unknown_tag_validate,
+};
+
+static inline bool
+_tag_registration_is_unknown(struct sieve_tag_registration *tag_reg)
+{
+	return (tag_reg != NULL && tag_reg->tag_def == &_unknown_tag);
+}
+
+/* Registry functions */
+
+static void
+_sieve_validator_register_tag(struct sieve_validator *valdtr,
+			      struct sieve_command_registration *cmd_reg,
+			      const struct sieve_extension *ext,
+			      const struct sieve_argument_def *tag_def,
+			      const char *identifier, int id_code)
+{
+	struct sieve_tag_registration *reg;
+
+	reg = p_new(valdtr->pool, struct sieve_tag_registration, 1);
+	reg->ext = ext;
+	reg->tag_def = tag_def;
+	reg->id_code = id_code;
+	if (identifier == NULL)
+		reg->identifier = tag_def->identifier;
+	else
+		reg->identifier = p_strdup(valdtr->pool, identifier);
+
+	if (!array_is_created(&cmd_reg->normal_tags))
+		p_array_init(&cmd_reg->normal_tags, valdtr->pool, 4);
+
+	array_append(&cmd_reg->normal_tags, &reg, 1);
+}
+
+void sieve_validator_register_persistent_tag(
+	struct sieve_validator *valdtr, const char *command,
+	const struct sieve_extension *ext,
+	const struct sieve_argument_def *tag_def)
+{
+	/* Add the tag to the persistent tags list if necessary */
+	if (tag_def->validate_persistent != NULL) {
+		struct sieve_command_registration *cmd_reg =
+			sieve_validator_find_command_registration(
+				valdtr, command);
+
+		if (cmd_reg == NULL) {
+			cmd_reg = _sieve_validator_register_command(
+				valdtr, NULL, NULL, command);
+		}
+
+		struct sieve_tag_registration *reg;
+
+		if (!array_is_created(&cmd_reg->persistent_tags)) {
+			p_array_init(&cmd_reg->persistent_tags,
+				     valdtr->pool, 4);
+		} else {
+			struct sieve_tag_registration *reg_idx;
+
+			/* Avoid dupplicate registration */
+			array_foreach_elem(&cmd_reg->persistent_tags, reg_idx) {
+				if (reg_idx->tag_def == tag_def)
+					return;
+			}
+		}
+
+		reg = p_new(valdtr->pool, struct sieve_tag_registration, 1);
+		reg->ext = ext;
+		reg->tag_def = tag_def;
+		reg->id_code = -1;
+
+		array_append(&cmd_reg->persistent_tags, &reg, 1);
+	}
+}
+
+void sieve_validator_register_external_tag(
+	struct sieve_validator *valdtr, const char *command,
+	const struct sieve_extension *ext,
+	const struct sieve_argument_def *tag_def, int id_code)
+{
+	struct sieve_command_registration *cmd_reg =
+		sieve_validator_find_command_registration(valdtr, command);
+
+	if (cmd_reg == NULL) {
+		cmd_reg = _sieve_validator_register_command(
+			valdtr, NULL, NULL, command);
+	}
+
+	_sieve_validator_register_tag(valdtr, cmd_reg, ext, tag_def,
+				      NULL, id_code);
+}
+
+void sieve_validator_register_tag(
+	struct sieve_validator *valdtr,
+	struct sieve_command_registration *cmd_reg,
+	const struct sieve_extension *ext,
+	const struct sieve_argument_def *tag_def, int id_code)
+{
+	if (tag_def->is_instance_of == NULL) {
+		_sieve_validator_register_tag(valdtr, cmd_reg, ext, tag_def,
+					      NULL, id_code);
+	} else {
+		struct sieve_tag_registration *reg =
+			p_new(valdtr->pool, struct sieve_tag_registration, 1);
+		reg->ext = ext;
+		reg->tag_def = tag_def;
+		reg->id_code = id_code;
+
+		if (!array_is_created(&cmd_reg->instanced_tags))
+			p_array_init(&cmd_reg->instanced_tags, valdtr->pool, 4);
+
+		array_append(&cmd_reg->instanced_tags, &reg, 1);
+	}
+}
+
+static void
+sieve_validator_register_unknown_tag(struct sieve_validator *valdtr,
+				     struct sieve_command_registration *cmd_reg,
+				     const char *tag)
+{
+	_sieve_validator_register_tag(valdtr, cmd_reg, NULL,
+				      &_unknown_tag, tag, 0);
+}
+
+static struct sieve_tag_registration *
+_sieve_validator_command_tag_get(struct sieve_validator *valdtr,
+				 struct sieve_command *cmd,
+				 const char *tag, void **data)
+{
+	struct sieve_command_registration *cmd_reg = cmd->reg;
+	struct sieve_tag_registration * const *regs;
+	unsigned int i, reg_count;
+
+	/* First check normal tags */
+	if (array_is_created(&cmd_reg->normal_tags)) {
+		regs = array_get(&cmd_reg->normal_tags, &reg_count);
+
+		for (i = 0; i < reg_count; i++) {
+			if (regs[i]->tag_def != NULL &&
+			    strcasecmp(regs[i]->identifier, tag) == 0) {
+
+				return regs[i];
+			}
+		}
+	}
+
+	/* Not found so far, try the instanced tags */
+	if (array_is_created(&cmd_reg->instanced_tags)) {
+		regs = array_get(&cmd_reg->instanced_tags, &reg_count);
+
+		for (i = 0; i < reg_count; i++) {
+			if (regs[i]->tag_def != NULL) {
+				if (regs[i]->tag_def->is_instance_of(
+					valdtr, cmd, regs[i]->ext, tag, data))
+					return regs[i];
+			}
+		}
+	}
+
+	return NULL;
+}
+
+static bool
+sieve_validator_command_tag_exists(struct sieve_validator *valdtr,
+				   struct sieve_command *cmd, const char *tag)
+{
+	return (_sieve_validator_command_tag_get(valdtr, cmd,
+						 tag, NULL) != NULL);
+}
+
+static struct sieve_tag_registration *
+sieve_validator_command_tag_get(struct sieve_validator *valdtr,
+				struct sieve_command *cmd,
+				struct sieve_ast_argument *arg, void **data)
+{
+	const char *tag = sieve_ast_argument_tag(arg);
+
+	return _sieve_validator_command_tag_get(valdtr, cmd, tag, data);
+}
+
+/*
+ * Extension support
+ */
+
+static bool
+sieve_validator_extensions_check_conficts(struct sieve_validator *valdtr,
+					  struct sieve_ast_argument *ext_arg,
+					  const struct sieve_extension *ext)
+{
+	struct sieve_validator_extension_reg *ext_reg;
+	struct sieve_validator_extension_reg *regs;
+	unsigned int count, i;
+
+	if (ext->id < 0)
+		return TRUE;
+
+	ext_reg = array_idx_get_space(&valdtr->extensions,
+				      (unsigned int) ext->id);
+
+	regs = array_get_modifiable(&valdtr->extensions, &count);
+	for (i = 0; i < count; i++) {
+		bool required = ext_reg->required && regs[i].required;
+
+		if (regs[i].ext == NULL)
+			continue;
+		if (regs[i].ext == ext)
+			continue;
+		if (!regs[i].loaded)
+			continue;
+
+		/* Check this extension vs other extension */
+		if (ext_reg->valext != NULL &&
+		    ext_reg->valext->check_conflict != NULL) {
+			struct sieve_ast_argument *this_ext_arg =
+				(ext_arg == NULL ? regs[i].arg : ext_arg);
+
+			if (!ext_reg->valext->check_conflict(
+				ext, valdtr, ext_reg->context, this_ext_arg,
+				regs[i].ext, required))
+				return FALSE;
+		}
+
+		/* Check other extension vs this extension */
+		if (regs[i].valext != NULL &&
+		    regs[i].valext->check_conflict != NULL) {
+			if (!regs[i].valext->check_conflict(
+				regs[i].ext, valdtr, regs[i].context,
+				regs[i].arg, ext, required))
+				return FALSE;
+		}
+	}
+	return TRUE;
+}
+
+bool sieve_validator_extension_load(struct sieve_validator *valdtr,
+				    struct sieve_command *cmd,
+				    struct sieve_ast_argument *ext_arg,
+				    const struct sieve_extension *ext,
+				    bool required)
+{
+	const struct sieve_extension_def *extdef = ext->def;
+	struct sieve_validator_extension_reg *reg = NULL;
+
+	if (ext->global &&
+	    (valdtr->flags & SIEVE_COMPILE_FLAG_NOGLOBAL) != 0) {
+		const char *cmd_prefix = (cmd == NULL ? "" :
+			t_strdup_printf("%s %s: ",
+					sieve_command_identifier(cmd),
+					sieve_command_type_name(cmd)));
+		sieve_argument_validate_error(
+			valdtr, ext_arg,
+			"%sfailed to load Sieve capability `%s': "
+			"its use is restricted to global scripts",
+			cmd_prefix, sieve_extension_name(ext));
+		return FALSE;
+	}
+
+	/* Register extension no matter what and store the
+	 * AST argument registering it */
+	if (ext->id >= 0) {
+		reg = array_idx_get_space(&valdtr->extensions,
+					  (unsigned int)ext->id);
+		i_assert(reg->ext == NULL || reg->ext == ext);
+		reg->ext = ext;
+		reg->required = reg->required || required;
+		if (reg->arg == NULL)
+			reg->arg = ext_arg;
+	}
+
+	if (extdef->validator_load != NULL &&
+	    !extdef->validator_load(ext, valdtr)) {
+		const char *cmd_prefix = (cmd == NULL ? "" :
+			t_strdup_printf("%s %s: ",
+					sieve_command_identifier(cmd),
+					sieve_command_type_name(cmd)));
+		sieve_argument_validate_error(
+			valdtr, ext_arg,
+			"%sfailed to load Sieve capability `%s'",
+			cmd_prefix, sieve_extension_name(ext));
+		return FALSE;
+	}
+
+	/* Check conflicts with other extensions */
+	if (!sieve_validator_extensions_check_conficts(valdtr, ext_arg, ext))
+		return FALSE;
+
+	/* Link extension to AST for use at code generation */
+	if (reg != NULL) {
+		sieve_ast_extension_link(valdtr->ast, ext, reg->required);
+		reg->loaded = TRUE;
+	}
+
+	return TRUE;
+}
+
+const struct sieve_extension *
+sieve_validator_extension_load_by_name(struct sieve_validator *valdtr,
+				       struct sieve_command *cmd,
+				       struct sieve_ast_argument *ext_arg,
+				       const char *ext_name)
+{
+	const struct sieve_extension *ext;
+
+	ext = sieve_extension_get_by_name(valdtr->svinst, ext_name);
+
+	if (ext == NULL || ext->def == NULL || !ext->enabled) {
+		unsigned int i;
+		bool core_test = FALSE;
+		bool core_command = FALSE;
+
+		for (i = 0; !core_command && i < sieve_core_commands_count;
+		     i++) {
+			if (strcasecmp(sieve_core_commands[i]->identifier,
+				       ext_name) == 0)
+				core_command = TRUE;
+		}
+
+		for (i = 0; !core_test && i < sieve_core_tests_count; i++) {
+			if (strcasecmp(sieve_core_tests[i]->identifier,
+				       ext_name) == 0)
+				core_test = TRUE;
+		}
+
+		if (core_test || core_command) {
+			sieve_argument_validate_error(
+				valdtr, ext_arg,
+				"%s %s: `%s' is not known as a Sieve capability, "
+				"but it is known as a Sieve %s that is always available",
+				sieve_command_identifier(cmd),
+				sieve_command_type_name(cmd),
+				str_sanitize(ext_name, 128),
+				(core_test ? "test" : "command"));
+		} else {
+			sieve_argument_validate_error(
+				valdtr, ext_arg,
+				"%s %s: unknown Sieve capability `%s'",
+				sieve_command_identifier(cmd),
+				sieve_command_type_name(cmd),
+				str_sanitize(ext_name, 128));
+		}
+		return NULL;
+	}
+
+	if (!sieve_validator_extension_load(valdtr, cmd, ext_arg, ext, TRUE))
+		return NULL;
+
+	return ext;
+}
+
+const struct sieve_extension *
+sieve_validator_extension_load_implicit(struct sieve_validator *valdtr,
+					const char *ext_name)
+{
+	const struct sieve_extension *ext;
+
+	ext = sieve_extension_get_by_name(valdtr->svinst, ext_name);
+
+	if (ext == NULL || ext->def == NULL)
+		return NULL;
+
+	if (!sieve_validator_extension_load(valdtr, NULL, NULL, ext, TRUE))
+		return NULL;
+
+	return ext;
+}
+
+void sieve_validator_extension_register(
+	struct sieve_validator *valdtr,	const struct sieve_extension *ext,
+	const struct sieve_validator_extension *valext, void *context)
+{
+	struct sieve_validator_extension_reg *reg;
+
+	if (ext->id < 0)
+		return;
+
+	reg = array_idx_get_space(&valdtr->extensions, (unsigned int) ext->id);
+	i_assert(reg->ext == NULL || reg->ext == ext);
+	reg->ext = ext;
+	reg->valext = valext;
+	reg->context = context;
+}
+
+bool sieve_validator_extension_loaded(struct sieve_validator *valdtr,
+				      const struct sieve_extension *ext)
+{
+	const struct sieve_validator_extension_reg *reg;
+
+	if (ext->id < 0 || ext->id >= (int) array_count(&valdtr->extensions))
+		return FALSE;
+
+	reg = array_idx(&valdtr->extensions, (unsigned int) ext->id);
+
+	return (reg->loaded);
+}
+
+void sieve_validator_extension_set_context(struct sieve_validator *valdtr,
+					   const struct sieve_extension *ext,
+					   void *context)
+{
+	struct sieve_validator_extension_reg *reg;
+
+	if (ext->id < 0)
+		return;
+
+	reg = array_idx_get_space(&valdtr->extensions, (unsigned int) ext->id);
+	reg->context = context;
+}
+
+void *sieve_validator_extension_get_context(struct sieve_validator *valdtr,
+					    const struct sieve_extension *ext)
+{
+	const struct sieve_validator_extension_reg *reg;
+
+	if (ext->id < 0 || ext->id >= (int) array_count(&valdtr->extensions))
+		return NULL;
+
+	reg = array_idx(&valdtr->extensions, (unsigned int) ext->id);
+
+	return reg->context;
+}
+
+/*
+ * Overriding the default literal arguments
+ */
+
+void sieve_validator_argument_override(struct sieve_validator *valdtr,
+				       enum sieve_argument_type type,
+				       const struct sieve_extension *ext,
+				       const struct sieve_argument_def *arg_def)
+{
+	struct sieve_default_argument *arg;
+
+	if (valdtr->default_arguments[type].arg_def != NULL) {
+		arg = p_new(valdtr->pool, struct sieve_default_argument, 1);
+		*arg = valdtr->default_arguments[type];
+
+		valdtr->default_arguments[type].overrides = arg;
+	}
+
+	valdtr->default_arguments[type].arg_def = arg_def;
+	valdtr->default_arguments[type].ext = ext;
+}
+
+static bool
+sieve_validator_argument_default_activate(struct sieve_validator *valdtr,
+					  struct sieve_command *cmd,
+					  struct sieve_default_argument *defarg,
+					  struct sieve_ast_argument *arg)
+{
+	bool result = TRUE;
+	struct sieve_default_argument *prev_defarg;
+
+	prev_defarg = valdtr->current_defarg;
+	valdtr->current_defarg = defarg;
+
+	if (arg->argument == NULL) {
+		arg->argument = sieve_argument_create(arg->ast, defarg->arg_def,
+						      defarg->ext, 0);
+	} else {
+		arg->argument->def = defarg->arg_def;
+		arg->argument->ext = defarg->ext;
+	}
+
+	if (defarg->arg_def != NULL && defarg->arg_def->validate != NULL)
+		result = defarg->arg_def->validate(valdtr, &arg, cmd);
+
+	valdtr->current_defarg = prev_defarg;
+
+	return result;
+}
+
+bool sieve_validator_argument_activate_super(struct sieve_validator *valdtr,
+					     struct sieve_command *cmd,
+					     struct sieve_ast_argument *arg,
+					     bool constant ATTR_UNUSED)
+{
+	struct sieve_default_argument *defarg;
+
+	if (valdtr->current_defarg == NULL ||
+	    valdtr->current_defarg->overrides == NULL)
+		return FALSE;
+
+	if (valdtr->current_defarg->overrides->arg_def == &string_argument) {
+		switch (valdtr->current_defarg_type) {
+		case SAT_CONST_STRING:
+			if (!valdtr->current_defarg_constant) {
+				valdtr->current_defarg_type = SAT_VAR_STRING;
+				defarg = &valdtr->default_arguments[SAT_VAR_STRING];
+			} else {
+				defarg = valdtr->current_defarg->overrides;
+			}
+			break;
+		case SAT_VAR_STRING:
+			defarg = valdtr->current_defarg->overrides;
+			break;
+		default:
+			return FALSE;
+		}
+	} else {
+		defarg = valdtr->current_defarg->overrides;
+	}
+
+	return sieve_validator_argument_default_activate(valdtr, cmd,
+							 defarg, arg);
+}
+
+/*
+ * Argument Validation API
+ */
+
+bool sieve_validator_argument_activate(struct sieve_validator *valdtr,
+				       struct sieve_command *cmd,
+				       struct sieve_ast_argument *arg,
+				       bool constant)
+{
+	struct sieve_default_argument *defarg;
+
+	switch (sieve_ast_argument_type(arg)) {
+	case SAAT_NUMBER:
+		valdtr->current_defarg_type = SAT_NUMBER;
+		break;
+	case SAAT_STRING:
+		valdtr->current_defarg_type = SAT_CONST_STRING;
+		break;
+	case SAAT_STRING_LIST:
+		valdtr->current_defarg_type = SAT_STRING_LIST;
+		break;
+	default:
+		return FALSE;
+	}
+
+	valdtr->current_defarg_constant = constant;
+	defarg = &valdtr->default_arguments[valdtr->current_defarg_type];
+
+	if (!constant && defarg->arg_def == &string_argument) {
+		valdtr->current_defarg_type = SAT_VAR_STRING;
+		defarg = &valdtr->default_arguments[SAT_VAR_STRING];
+	}
+
+	return sieve_validator_argument_default_activate(valdtr, cmd,
+							 defarg, arg);
+}
+
+bool sieve_validate_positional_argument(struct sieve_validator *valdtr,
+					struct sieve_command *cmd,
+					struct sieve_ast_argument *arg,
+					const char *arg_name,
+					unsigned int arg_pos,
+					enum sieve_ast_argument_type req_type)
+{
+	i_assert(arg != NULL);
+
+	if (sieve_ast_argument_type(arg) != req_type &&
+	    (sieve_ast_argument_type(arg) != SAAT_STRING ||
+	     req_type != SAAT_STRING_LIST))
+	{
+		sieve_argument_validate_error(
+			valdtr, arg,
+			"the %s %s expects %s as argument %d (%s), "
+			"but %s was found",
+			sieve_command_identifier(cmd),
+			sieve_command_type_name(cmd),
+			sieve_ast_argument_type_name(req_type),
+			arg_pos, arg_name, sieve_ast_argument_name(arg));
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+bool sieve_validate_tag_parameter(struct sieve_validator *valdtr,
+				  struct sieve_command *cmd,
+				  struct sieve_ast_argument *tag,
+				  struct sieve_ast_argument *param,
+				  const char *arg_name, unsigned int arg_pos,
+				  enum sieve_ast_argument_type req_type,
+				  bool constant)
+{
+	i_assert(tag != NULL);
+
+	if (param == NULL) {
+		const char *position = (arg_pos == 0 ? "" :
+			t_strdup_printf(" %d (%s)", arg_pos, arg_name));
+
+		sieve_argument_validate_error(
+			valdtr, tag,
+			"the :%s tag for the %s %s requires %s as parameter%s, "
+			"but no parameters were found",
+			sieve_ast_argument_tag(tag),
+			sieve_command_identifier(cmd),
+			sieve_command_type_name(cmd),
+			sieve_ast_argument_type_name(req_type), position);
+		return FALSE;
+	}
+
+	if (sieve_ast_argument_type(param) != req_type &&
+	    (sieve_ast_argument_type(param) != SAAT_STRING ||
+	     req_type != SAAT_STRING_LIST))
+	{
+		const char *position = (arg_pos == 0 ? "" :
+			t_strdup_printf(" %d (%s)", arg_pos, arg_name));
+
+		sieve_argument_validate_error(
+			valdtr, param,
+			"the :%s tag for the %s %s requires %s as parameter%s, "
+			"but %s was found",
+			sieve_ast_argument_tag(tag),
+			sieve_command_identifier(cmd),
+			sieve_command_type_name(cmd),
+			sieve_ast_argument_type_name(req_type),	position,
+			sieve_ast_argument_name(param));
+		return FALSE;
+	}
+
+	if (!sieve_validator_argument_activate(valdtr, cmd, param, constant))
+		return FALSE;
+
+	param->argument->id_code = tag->argument->id_code;
+
+	return TRUE;
+}
+
+/*
+ * Command argument validation
+ */
+
+static bool
+sieve_validate_command_arguments(struct sieve_validator *valdtr,
+				 struct sieve_command *cmd)
+{
+	int arg_count = cmd->def->positional_args;
+	int real_count = 0;
+	struct sieve_ast_argument *arg;
+	struct sieve_command_registration *cmd_reg = cmd->reg;
+
+	/* Resolve tagged arguments */
+	arg = sieve_ast_argument_first(cmd->ast_node);
+	while (arg != NULL) {
+		void *arg_data = NULL;
+		struct sieve_tag_registration *tag_reg;
+		const struct sieve_argument_def *tag_def;
+
+		if (sieve_ast_argument_type(arg) != SAAT_TAG) {
+			arg = sieve_ast_argument_next(arg);
+			continue;
+		}
+
+		tag_reg = sieve_validator_command_tag_get(valdtr, cmd,
+							  arg, &arg_data);
+
+		if (tag_reg == NULL) {
+			sieve_argument_validate_error(
+				valdtr, arg,
+				"unknown tagged argument ':%s' for the %s %s "
+				"(reported only once at first occurrence)",
+				sieve_ast_argument_tag(arg),
+				sieve_command_identifier(cmd),
+				sieve_command_type_name(cmd));
+			sieve_validator_register_unknown_tag(
+				valdtr, cmd_reg, sieve_ast_argument_tag(arg));
+			return FALSE;
+		}
+
+		/* Check whether previously tagged as unknown */
+		if (_tag_registration_is_unknown(tag_reg))
+			return FALSE;
+
+		tag_def = tag_reg->tag_def;
+
+		/* Assign the tagged argument type to the ast for later
+		   reference */
+		arg->argument = sieve_argument_create(
+			arg->ast, tag_def, tag_reg->ext, tag_reg->id_code);
+		arg->argument->data = arg_data;
+
+		arg = sieve_ast_argument_next(arg);
+	}
+
+	/* Validate tagged arguments */
+	arg = sieve_ast_argument_first(cmd->ast_node);
+	while (arg != NULL && sieve_ast_argument_type(arg) == SAAT_TAG) {
+		const struct sieve_argument_def *tag_def = arg->argument->def;
+		struct sieve_ast_argument *parg;
+
+		/* Scan backwards for any duplicates */
+		if ((tag_def->flags & SIEVE_ARGUMENT_FLAG_MULTIPLE) == 0) {
+			parg = sieve_ast_argument_prev(arg);
+			while (parg != NULL) {
+				if ((sieve_ast_argument_type(parg) == SAAT_TAG &&
+				     parg->argument->def == tag_def) ||
+				    (arg->argument->id_code > 0 &&
+				     parg->argument != NULL &&
+				     parg->argument->id_code == arg->argument->id_code))
+				{
+					const char *tag_id = sieve_ast_argument_tag(arg);
+					const char *tag_desc =
+						strcmp(tag_def->identifier, tag_id) != 0 ?
+						t_strdup_printf("%s argument (:%s)",
+							        tag_def->identifier, tag_id) :
+						t_strdup_printf(":%s argument",
+								tag_def->identifier);
+
+					sieve_argument_validate_error(
+						valdtr, arg,
+						"encountered duplicate %s for the %s %s",
+						tag_desc, sieve_command_identifier(cmd),
+						sieve_command_type_name(cmd));
+
+					return FALSE;
+				}
+
+				parg = sieve_ast_argument_prev(parg);
+			}
+		}
+
+		/* Call the validation function for the tag (if present)
+		     Fail if the validation fails:
+		       Let's not whine multiple	times about a single command
+		       having multiple bad arguments...
+		 */
+		if (tag_def->validate != NULL) {
+			if (!tag_def->validate(valdtr, &arg, cmd))
+				return FALSE;
+		} else {
+			arg = sieve_ast_argument_next(arg);
+		}
+	}
+
+	/* Remaining arguments should be positional (tags are not allowed
+	   here) */
+	cmd->first_positional = arg;
+
+	while (arg != NULL) {
+		if (sieve_ast_argument_type(arg) == SAAT_TAG) {
+			sieve_argument_validate_error(
+				valdtr, arg,
+				"encountered an unexpected tagged argument ':%s' "
+				"while validating positional arguments for the %s %s",
+				sieve_ast_argument_tag(arg),
+				sieve_command_identifier(cmd),
+				sieve_command_type_name(cmd));
+			return FALSE;
+		}
+
+		real_count++;
+
+		arg = sieve_ast_argument_next(arg);
+	}
+
+	/* Check the required count versus the real number of arguments */
+	if (arg_count >= 0 && real_count != arg_count) {
+		sieve_command_validate_error(
+			valdtr, cmd,
+			"the %s %s requires %d positional argument(s), "
+			"but %d is/are specified",
+			sieve_command_identifier(cmd),
+			sieve_command_type_name(cmd),
+			arg_count, real_count);
+		return FALSE;
+	}
+
+	/* Call initial validation for persistent arguments */
+	if (array_is_created(&cmd_reg->persistent_tags)) {
+		struct sieve_tag_registration * const *regs;
+		unsigned int i, reg_count;
+
+		regs = array_get(&cmd_reg->persistent_tags, &reg_count);
+		for (i = 0; i < reg_count; i++) {
+			const struct sieve_argument_def *tag_def =
+				regs[i]->tag_def;
+
+			if (tag_def != NULL &&
+			    tag_def->validate_persistent != NULL) {
+				/* To be sure */
+				if (!tag_def->validate_persistent(
+					valdtr, cmd, regs[i]->ext))
+	  				return FALSE;
+			}
+		}
+	}
+
+	return TRUE;
+}
+
+static bool
+sieve_validate_arguments_context(struct sieve_validator *valdtr,
+				 struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg =
+		sieve_command_first_argument(cmd);
+
+	while (arg != NULL) {
+		const struct sieve_argument *argument = arg->argument;
+
+		if (argument != NULL && argument->def != NULL &&
+		    argument->def->validate_context != NULL) {
+
+			if (!argument->def->validate_context(valdtr, arg, cmd))
+				return FALSE;
+		}
+
+		arg = sieve_ast_argument_next(arg);
+	}
+
+	return TRUE;
+}
+
+/*
+ * Command Validation API
+ */
+
+static bool
+sieve_validate_command_subtests(struct sieve_validator *valdtr,
+				struct sieve_command *cmd,
+				const unsigned int count)
+{
+	switch (count) {
+	case 0:
+	 	if (sieve_ast_test_count(cmd->ast_node) > 0) {
+			/* Unexpected command specified */
+			enum sieve_command_type ctype = SCT_NONE;
+			struct sieve_command_registration *cmd_reg;
+			struct sieve_ast_node *test =
+				sieve_ast_test_first(cmd->ast_node);
+
+			cmd_reg = sieve_validator_find_command_registration(
+				valdtr, test->identifier);
+
+			/* First check what we are dealing with */
+			if (cmd_reg != NULL && cmd_reg->cmd_def != NULL)
+				ctype = cmd_reg->cmd_def->type;
+
+			switch (ctype) {
+			case SCT_TEST: /* Spurious test */
+			case SCT_HYBRID:
+				sieve_command_validate_error(
+					valdtr, cmd,
+					"the %s %s accepts no sub-tests, "
+					"but tests are specified",
+					sieve_command_identifier(cmd),
+					sieve_command_type_name(cmd));
+				break;
+			case SCT_NONE: /* Unknown command */
+				/* Is it perhaps a tag for which the ':' was
+				   omitted ? */
+				if (sieve_validator_command_tag_exists(
+					valdtr, cmd, test->identifier)) {
+					sieve_command_validate_error(
+						valdtr, cmd,
+						"missing colon ':' before ':%s' tag in %s %s",
+						test->identifier,
+						sieve_command_identifier(cmd),
+						sieve_command_type_name(cmd));
+					break;
+				}
+				/* Fall through */
+			case SCT_COMMAND:
+				sieve_command_validate_error(
+					valdtr, cmd,
+					"missing semicolon ';' after %s %s",
+					sieve_command_identifier(cmd),
+					sieve_command_type_name(cmd));
+				break;
+			}
+			return FALSE;
+		}
+		break;
+	case 1:
+		if (sieve_ast_test_count(cmd->ast_node) == 0) {
+			sieve_command_validate_error(
+				valdtr, cmd,
+				"the %s %s requires one sub-test, "
+				"but none is specified",
+				sieve_command_identifier(cmd),
+				sieve_command_type_name(cmd));
+			return FALSE;
+
+		} else if (sieve_ast_test_count(cmd->ast_node) > 1 ||
+			   cmd->ast_node->test_list) {
+			sieve_command_validate_error(
+				valdtr, cmd,
+				"the %s %s requires one sub-test, "
+				"but a list of tests is specified",
+				sieve_command_identifier(cmd),
+				sieve_command_type_name(cmd));
+			return FALSE;
+		}
+		break;
+	default:
+		if (sieve_ast_test_count(cmd->ast_node) == 0) {
+			sieve_command_validate_error(
+				valdtr, cmd,
+				"the %s %s requires a list of sub-tests, "
+				"but none is specified",
+				sieve_command_identifier(cmd),
+				sieve_command_type_name(cmd));
+			return FALSE;
+		} else if (sieve_ast_test_count(cmd->ast_node) == 1 &&
+			   !cmd->ast_node->test_list) {
+			sieve_command_validate_error(
+				valdtr, cmd,
+				"the %s %s requires a list of sub-tests, "
+				"but a single test is specified",
+				sieve_command_identifier(cmd),
+				sieve_command_type_name(cmd));
+			return FALSE;
+		}
+		break;
+	}
+
+	return TRUE;
+}
+
+static bool
+sieve_validate_command_block(struct sieve_validator *valdtr,
+			     struct sieve_command *cmd, bool block_allowed,
+			     bool block_required)
+{
+	i_assert(cmd->ast_node->type == SAT_COMMAND);
+
+	if (block_required) {
+		if (!cmd->ast_node->block) {
+			sieve_command_validate_error(
+				valdtr, cmd,
+				"the %s command requires a command block, "
+				"but it is missing",
+				sieve_command_identifier(cmd));
+			return FALSE;
+		}
+	} else if (!block_allowed && cmd->ast_node->block) {
+		sieve_command_validate_error(
+			valdtr, cmd,
+			"the %s command does not accept a command block, "
+			"but one is specified anyway",
+			sieve_command_identifier(cmd));
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+/*
+ * AST Validation
+ */
+
+static bool
+sieve_validate_test_list(struct sieve_validator *valdtr,
+			 struct sieve_ast_node *test_list, int *const_r);
+static bool
+sieve_validate_block(struct sieve_validator *valdtr,
+		     struct sieve_ast_node *block);
+static bool
+sieve_validate_command(struct sieve_validator *valdtr,
+		       struct sieve_ast_node *cmd_node, int *const_r);
+
+static bool
+sieve_validate_command_context(struct sieve_validator *valdtr,
+			       struct sieve_ast_node *cmd_node)
+{
+	enum sieve_ast_type ast_type = sieve_ast_node_type(cmd_node);
+	struct sieve_command_registration *cmd_reg;
+
+	i_assert(ast_type == SAT_TEST || ast_type == SAT_COMMAND);
+
+	/* Verify the command specified by this node */
+	cmd_reg = sieve_validator_find_command_registration(
+		valdtr, cmd_node->identifier);
+
+	if (cmd_reg != NULL && cmd_reg->cmd_def != NULL) {
+		const struct sieve_command_def *cmd_def = cmd_reg->cmd_def;
+
+		/* Identifier = "" when the command was previously marked as
+		   unknown */
+		if (*(cmd_def->identifier) != '\0') {
+			if ((cmd_def->type == SCT_COMMAND && ast_type == SAT_TEST) ||
+			    (cmd_def->type == SCT_TEST && ast_type == SAT_COMMAND)) {
+				sieve_validator_error(
+					valdtr, cmd_node->source_line,
+					"attempted to use %s '%s' as %s",
+					sieve_command_def_type_name(cmd_def),
+					cmd_node->identifier,
+					sieve_ast_type_name(ast_type));
+			 	return FALSE;
+			}
+
+			cmd_node->command = sieve_command_create(
+				cmd_node, cmd_reg->ext, cmd_def, cmd_reg);
+		} else {
+			return FALSE;
+		}
+	} else {
+		sieve_validator_error(
+			valdtr, cmd_node->source_line,
+			"unknown %s '%s' (only reported once at first occurrence)",
+			sieve_ast_type_name(ast_type), cmd_node->identifier);
+
+		sieve_validator_register_unknown_command(
+			valdtr, cmd_node->identifier);
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+static bool
+sieve_validate_command(struct sieve_validator *valdtr,
+		       struct sieve_ast_node *cmd_node, int *const_r)
+{
+	enum sieve_ast_type ast_type = sieve_ast_node_type(cmd_node);
+	struct sieve_command *cmd =
+		(cmd_node == NULL ? NULL : cmd_node->command);
+	const struct sieve_command_def *cmd_def =
+		(cmd != NULL ? cmd->def : NULL);
+	bool result = TRUE;
+
+	i_assert(ast_type == SAT_TEST || ast_type == SAT_COMMAND);
+
+	if (cmd_def != NULL && *(cmd_def->identifier) != '\0') {
+		if (cmd_def->pre_validate == NULL ||
+		    cmd_def->pre_validate(valdtr, cmd)) {
+			/* Check argument syntax */
+			if (!sieve_validate_command_arguments(valdtr, cmd)) {
+				result = FALSE;
+
+				/* A missing ':' causes a tag to become a test.
+				   This can be the cause of the arguments
+				   validation failing. Therefore we must produce
+				   an error for the sub-tests as well if
+				   appropriate. */
+				(void)sieve_validate_command_subtests(
+					valdtr, cmd, cmd_def->subtests);
+			} else if (!sieve_validate_command_subtests(
+				valdtr, cmd, cmd_def->subtests) ||
+				(ast_type == SAT_COMMAND &&
+				 !sieve_validate_command_block(
+					valdtr, cmd, cmd_def->block_allowed,
+					cmd_def->block_required))) {
+				result = FALSE;
+			} else {
+				/* Call command validation function if specified
+				 */
+				if (cmd_def->validate != NULL) {
+					result = cmd_def->validate(valdtr, cmd) &&
+						result;
+				}
+			}
+		} else {
+			/* If pre-validation fails, don't bother to validate
+			   further as context might be missing and doing so is
+			   not very useful for further error reporting anyway */
+			return FALSE;
+		}
+
+		result = result && sieve_validate_arguments_context(valdtr, cmd);
+	}
+
+	/*
+	 * Descend further into the AST
+	 */
+
+	if (cmd_def != NULL) {
+		/* Tests */
+		if (cmd_def->subtests > 0) {
+			if (result ||
+			    sieve_errors_more_allowed(valdtr->ehandler)) {
+				result = sieve_validate_test_list(
+					valdtr, cmd_node, const_r) && result;
+			}
+		} else if (result) {
+			if (cmd_def->validate_const != NULL) {
+				(void)cmd_def->validate_const(
+					valdtr, cmd, const_r, -1);
+			} else {
+				*const_r = -1;
+			}
+		}
+
+		/* Skip block if result of test is const FALSE */
+		if (result && *const_r == 0)
+			return TRUE;
+
+		/* Command block */
+		if (cmd_def->block_allowed && ast_type == SAT_COMMAND &&
+		    (result || sieve_errors_more_allowed(valdtr->ehandler))) {
+			result = sieve_validate_block(valdtr, cmd_node) &&
+				result;
+		}
+	}
+
+	return result;
+}
+
+static bool
+sieve_validate_test_list(struct sieve_validator *valdtr,
+			 struct sieve_ast_node *test_node, int *const_r)
+{
+	struct sieve_command *tst = test_node->command;
+	const struct sieve_command_def *tst_def =
+		(tst != NULL ? tst->def : NULL);
+	struct sieve_ast_node *test;
+	bool result = TRUE;
+
+	if (tst_def != NULL && tst_def->validate_const != NULL) {
+		if (!tst_def->validate_const(valdtr, tst, const_r, -2))
+			return TRUE;
+	}
+
+	test = sieve_ast_test_first(test_node);
+	while (test != NULL &&
+	       (result || sieve_errors_more_allowed(valdtr->ehandler))) {
+		int const_value = -2;
+
+		result = sieve_validate_command_context(valdtr, test) &&
+			sieve_validate_command(valdtr, test, &const_value) &&
+			result;
+
+		if (result) {
+			if (tst_def != NULL &&
+			    tst_def->validate_const != NULL) {
+				if (!tst_def->validate_const(
+					valdtr, tst, const_r, const_value))
+					return TRUE;
+			} else {
+				*const_r = -1;
+			}
+		}
+
+		if (result && const_value >= 0)
+			test = sieve_ast_node_detach(test);
+		else
+			test = sieve_ast_test_next(test);
+	}
+
+	return result;
+}
+
+static bool
+sieve_validate_block(struct sieve_validator *valdtr,
+		     struct sieve_ast_node *block)
+{
+	bool result = TRUE, fatal = FALSE;
+	struct sieve_ast_node *cmd_node, *next;
+
+	T_BEGIN {
+		cmd_node = sieve_ast_command_first(block);
+		while (!fatal && cmd_node != NULL &&
+		       (result ||
+			sieve_errors_more_allowed(valdtr->ehandler))) {
+			bool command_success;
+			int const_value = -2;
+
+			next = sieve_ast_command_next(cmd_node);
+
+	 		/* Check if this is the first non-require command */
+			if (sieve_ast_node_type(block) == SAT_ROOT &&
+			    !valdtr->finished_require &&
+			    strcasecmp(cmd_node->identifier,
+				       cmd_require.identifier) != 0) {
+				const struct sieve_validator_extension_reg *extrs;
+				const struct sieve_extension *const *exts;
+				unsigned int ext_count, i;
+
+				valdtr->finished_require = TRUE;
+
+				/* Load implicit extensions */
+				exts = sieve_extensions_get_all(valdtr->svinst, &ext_count);
+				for (i = 0; i < ext_count; i++) {
+					if (exts[i]->implicit) {
+						(void)sieve_validator_extension_load(
+							valdtr, NULL, NULL, exts[i], TRUE);
+					}
+				}
+
+				/* Validate all 'require'd extensions */
+				extrs = array_get(&valdtr->extensions, &ext_count);
+				for (i = 0; i < ext_count; i++) {
+					if (extrs[i].loaded && extrs[i].valext != NULL &&
+					    extrs[i].valext->validate != NULL) {
+						if (!extrs[i].valext->validate(
+							extrs[i].ext, valdtr,
+							extrs[i].context, extrs[i].arg,
+							extrs[i].required)) {
+							fatal = TRUE;
+							break;
+						}
+					}
+				}
+			}
+
+			command_success =
+				sieve_validate_command_context(valdtr, cmd_node);
+			result = command_success && result;
+
+			result = !fatal &&
+				sieve_validate_command(valdtr, cmd_node,
+						       &const_value) && result;
+
+			cmd_node = next;
+		}
+	} T_END;
+
+	return result && !fatal;
+}
+
+bool sieve_validator_run(struct sieve_validator *valdtr)
+{
+	return sieve_validate_block(valdtr, sieve_ast_root(valdtr->ast));
+}
+
+/*
+ * Validator object registry
+ */
+
+struct sieve_validator_object_reg {
+	const struct sieve_object_def *obj_def;
+	const struct sieve_extension *ext;
+};
+
+struct sieve_validator_object_registry {
+	struct sieve_validator *valdtr;
+	ARRAY(struct sieve_validator_object_reg) registrations;
+};
+
+struct sieve_validator_object_registry *
+sieve_validator_object_registry_get(struct sieve_validator *valdtr,
+				    const struct sieve_extension *ext)
+{
+	return (struct sieve_validator_object_registry *)
+		sieve_validator_extension_get_context(valdtr, ext);
+}
+
+void sieve_validator_object_registry_add(
+	struct sieve_validator_object_registry *regs,
+	const struct sieve_extension *ext,
+	const struct sieve_object_def *obj_def)
+{
+	struct sieve_validator_object_reg *reg;
+
+	reg = array_append_space(&regs->registrations);
+	reg->ext = ext;
+	reg->obj_def = obj_def;
+}
+
+bool sieve_validator_object_registry_find(
+	struct sieve_validator_object_registry *regs, const char *identifier,
+	struct sieve_object *obj)
+{
+	unsigned int i;
+
+	for (i = 0; i < array_count(&regs->registrations); i++) {
+		const struct sieve_validator_object_reg *reg =
+			array_idx(&regs->registrations, i);
+
+		if (strcasecmp(reg->obj_def->identifier, identifier) == 0) {
+			if (obj != NULL) {
+				obj->def = reg->obj_def;
+				obj->ext = reg->ext;
+			}
+			return TRUE;
+		}
+	}
+
+	return FALSE;
+}
+
+struct sieve_validator_object_registry *
+sieve_validator_object_registry_create(struct sieve_validator *valdtr)
+{
+	pool_t pool = valdtr->pool;
+	struct sieve_validator_object_registry *regs =
+		p_new(pool, struct sieve_validator_object_registry, 1);
+
+	/* Setup registry */
+	p_array_init(&regs->registrations, valdtr->pool, 4);
+
+	regs->valdtr = valdtr;
+
+	return regs;
+}
+
+struct sieve_validator_object_registry *
+sieve_validator_object_registry_init(struct sieve_validator *valdtr,
+				     const struct sieve_extension *ext)
+{
+	struct sieve_validator_object_registry *regs =
+		sieve_validator_object_registry_create(valdtr);
+
+	sieve_validator_extension_set_context(valdtr, ext, regs);
+	return regs;
+}
+
+/*
+ * Error handling
+ */
+
+#undef sieve_validator_error
+void sieve_validator_error(struct sieve_validator *valdtr,
+			   const char *csrc_filename, unsigned int csrc_linenum,
+			   unsigned int source_line, const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_ERROR,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+	};
+	va_list args;
+
+	params.location =
+		sieve_error_script_location(valdtr->script, source_line);
+
+	va_start(args, fmt);
+	sieve_logv(valdtr->ehandler, &params, fmt, args);
+	va_end(args);
+}
+
+#undef sieve_validator_warning
+void sieve_validator_warning(struct sieve_validator *valdtr,
+			     const char *csrc_filename,
+			     unsigned int csrc_linenum,
+			     unsigned int source_line, const char *fmt, ...)
+{
+	struct sieve_error_params params = {
+		.log_type = LOG_TYPE_WARNING,
+		.csrc = {
+			.filename = csrc_filename,
+			.linenum = csrc_linenum,
+		},
+	};
+	va_list args;
+
+	params.location =
+		sieve_error_script_location(valdtr->script, source_line);
+
+	va_start(args, fmt);
+	sieve_logv(valdtr->ehandler, &params, fmt, args);
+	va_end(args);
+
+}
diff --git a/pigeonhole/src/lib-sieve/sieve-validator.h b/pigeonhole/src/lib-sieve/sieve-validator.h
new file mode 100644
index 0000000..21b41cc
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve-validator.h
@@ -0,0 +1,197 @@
+#ifndef SIEVE_VALIDATOR_H
+#define SIEVE_VALIDATOR_H
+
+#include "lib.h"
+
+#include "sieve-common.h"
+
+/*
+ * Types
+ */
+
+enum sieve_argument_type {
+	SAT_NUMBER,
+	SAT_CONST_STRING,
+	SAT_VAR_STRING,
+	SAT_STRING_LIST,
+
+	SAT_COUNT
+};
+
+struct sieve_command_registration;
+
+/*
+ * Validator
+ */
+
+struct sieve_validator;
+
+struct sieve_validator *
+sieve_validator_create(struct sieve_ast *ast,
+		       struct sieve_error_handler *ehandler,
+		       enum sieve_compile_flags flags);
+void sieve_validator_free(struct sieve_validator **valdtr);
+pool_t sieve_validator_pool(struct sieve_validator *valdtr);
+
+bool sieve_validator_run(struct sieve_validator *valdtr);
+
+/*
+ * Accessors
+ */
+
+struct sieve_error_handler *
+sieve_validator_error_handler(struct sieve_validator *valdtr);
+struct sieve_ast *sieve_validator_ast(struct sieve_validator *valdtr);
+struct sieve_script *sieve_validator_script(struct sieve_validator *valdtr);
+struct sieve_instance *sieve_validator_svinst(struct sieve_validator *valdtr);
+enum sieve_compile_flags
+sieve_validator_compile_flags(struct sieve_validator *valdtr);
+
+/*
+ * Command/Test registry
+ */
+
+void sieve_validator_register_command(struct sieve_validator *valdtr,
+				      const struct sieve_extension *ext,
+				      const struct sieve_command_def *command);
+
+/*
+ * Per-command tagged argument registry
+ */
+
+void sieve_validator_register_tag(struct sieve_validator *valdtr,
+				  struct sieve_command_registration *cmd_reg,
+				  const struct sieve_extension *ext,
+				  const struct sieve_argument_def *tag_def,
+				  int id_code);
+void sieve_validator_register_external_tag(
+	struct sieve_validator *valdtr, const char *command,
+	const struct sieve_extension *ext,
+	const struct sieve_argument_def *tag_def, int id_code);
+void sieve_validator_register_persistent_tag(
+	struct sieve_validator *valdtr, const char *command,
+	const struct sieve_extension *ext,
+	const struct sieve_argument_def *tag_def);
+
+/*
+ * Overriding the default literal arguments
+ */
+
+void sieve_validator_argument_override(
+	struct sieve_validator *valdtr, enum sieve_argument_type type,
+	const struct sieve_extension *ext,
+	const struct sieve_argument_def *arg_def);
+bool sieve_validator_argument_activate_super(
+	struct sieve_validator *valdtr, struct sieve_command *cmd,
+	struct sieve_ast_argument *arg, bool constant);
+
+/*
+ * Argument validation API
+ */
+
+bool sieve_validate_positional_argument(struct sieve_validator *valdtr,
+					struct sieve_command *cmd,
+					struct sieve_ast_argument *arg,
+					const char *arg_name,
+					unsigned int arg_pos,
+					enum sieve_ast_argument_type req_type);
+bool sieve_validator_argument_activate(struct sieve_validator *valdtr,
+				       struct sieve_command *cmd,
+				       struct sieve_ast_argument *arg,
+				       bool constant);
+
+bool sieve_validate_tag_parameter(struct sieve_validator *valdtr,
+				  struct sieve_command *cmd,
+				  struct sieve_ast_argument *tag,
+				  struct sieve_ast_argument *param,
+				  const char *arg_name, unsigned int arg_pos,
+				  enum sieve_ast_argument_type req_type,
+				  bool constant);
+
+/*
+ * Extension support
+ */
+
+struct sieve_validator_extension {
+	const struct sieve_extension_def *ext;
+
+	bool (*check_conflict)(const struct sieve_extension *ext,
+			       struct sieve_validator *valdtr, void *context,
+			       struct sieve_ast_argument *require_arg,
+			       const struct sieve_extension *ext_other,
+			       bool required);
+	bool (*validate)(const struct sieve_extension *ext,
+			 struct sieve_validator *valdtr, void *context,
+			 struct sieve_ast_argument *require_arg, bool required);
+
+	void (*free)(const struct sieve_extension *ext,
+		     struct sieve_validator *valdtr, void *context);
+};
+
+bool sieve_validator_extension_load(struct sieve_validator *valdtr,
+				    struct sieve_command *cmd,
+				    struct sieve_ast_argument *ext_arg,
+				    const struct sieve_extension *ext,
+				    bool required) ATTR_NULL(2, 3);
+const struct sieve_extension *
+sieve_validator_extension_load_by_name(struct sieve_validator *valdtr,
+				       struct sieve_command *cmd,
+				       struct sieve_ast_argument *ext_arg,
+				       const char *ext_name);
+const struct sieve_extension *
+sieve_validator_extension_load_implicit(struct sieve_validator *valdtr,
+					const char *ext_name);
+
+void sieve_validator_extension_register(
+	struct sieve_validator *valdtr, const struct sieve_extension *ext,
+	const struct sieve_validator_extension *valext, void *context);
+bool sieve_validator_extension_loaded(struct sieve_validator *valdtr,
+				      const struct sieve_extension *ext);
+
+void sieve_validator_extension_set_context(struct sieve_validator *valdtr,
+					   const struct sieve_extension *ext,
+					   void *context);
+void *sieve_validator_extension_get_context(struct sieve_validator *valdtr,
+					    const struct sieve_extension *ext);
+
+/*
+ * Validator object registry
+ */
+
+struct sieve_validator_object_registry;
+
+struct sieve_validator_object_registry *
+sieve_validator_object_registry_get(struct sieve_validator *valdtr,
+				    const struct sieve_extension *ext);
+void sieve_validator_object_registry_add(
+	struct sieve_validator_object_registry *regs,
+	const struct sieve_extension *ext,
+	const struct sieve_object_def *obj_def);
+bool sieve_validator_object_registry_find(
+	struct sieve_validator_object_registry *regs, const char *identifier,
+	struct sieve_object *obj);
+struct sieve_validator_object_registry *
+sieve_validator_object_registry_create(struct sieve_validator *valdtr);
+struct sieve_validator_object_registry *
+sieve_validator_object_registry_init(struct sieve_validator *valdtr,
+				     const struct sieve_extension *ext);
+
+/*
+ * Error handling
+ */
+
+void sieve_validator_error(struct sieve_validator *valdtr,
+			   const char *csrc_filename, unsigned int csrc_linenum,
+			   unsigned int source_line, const char *fmt, ...)
+			   ATTR_FORMAT(5, 6);
+#define sieve_validator_error(valdtr, ...) \
+	sieve_validator_error(valdtr, __FILE__, __LINE__, __VA_ARGS__)
+void sieve_validator_warning(struct sieve_validator *valdtr,
+			     const char *csrc_filename,
+			     unsigned int csrc_linenum,
+			     unsigned int source_line, const char *fmt, ...)
+			     ATTR_FORMAT(5, 6);
+#define sieve_validator_warning(valdtr, ...) \
+	sieve_validator_warning(valdtr, __FILE__, __LINE__, __VA_ARGS__)
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/sieve.c b/pigeonhole/src/lib-sieve/sieve.c
new file mode 100644
index 0000000..69827a9
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve.c
@@ -0,0 +1,1303 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "istream.h"
+#include "ostream.h"
+#include "buffer.h"
+#include "time-util.h"
+#include "eacces-error.h"
+#include "home-expand.h"
+#include "hostpid.h"
+#include "message-address.h"
+#include "mail-user.h"
+
+#include "sieve-settings.h"
+#include "sieve-extensions.h"
+#include "sieve-plugins.h"
+
+#include "sieve-address.h"
+#include "sieve-script.h"
+#include "sieve-storage-private.h"
+#include "sieve-ast.h"
+#include "sieve-binary.h"
+#include "sieve-actions.h"
+#include "sieve-result.h"
+
+#include "sieve-parser.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-binary-dumper.h"
+
+#include "sieve.h"
+#include "sieve-common.h"
+#include "sieve-limits.h"
+#include "sieve-error-private.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <dirent.h>
+
+struct event_category event_category_sieve = {
+	.name = "sieve",
+};
+
+/*
+ * Main Sieve library interface
+ */
+
+struct sieve_instance *
+sieve_init(const struct sieve_environment *env,
+	   const struct sieve_callbacks *callbacks, void *context, bool debug)
+{
+	struct sieve_instance *svinst;
+	const char *domain;
+	pool_t pool;
+
+	/* Create Sieve engine instance */
+	pool = pool_alloconly_create("sieve", 8192);
+	svinst = p_new(pool, struct sieve_instance, 1);
+	svinst->pool = pool;
+	svinst->callbacks = callbacks;
+	svinst->context = context;
+	svinst->debug = debug;
+	svinst->base_dir = p_strdup_empty(pool, env->base_dir);
+	svinst->username = p_strdup_empty(pool, env->username);
+	svinst->home_dir = p_strdup_empty(pool, env->home_dir);
+	svinst->temp_dir = p_strdup_empty(pool, env->temp_dir);
+	svinst->flags = env->flags;
+	svinst->env_location = env->location;
+	svinst->delivery_phase = env->delivery_phase;
+
+	svinst->event = event_create(env->event_parent);
+	event_add_category(svinst->event, &event_category_sieve);
+	event_set_forced_debug(svinst->event, debug);
+	event_set_append_log_prefix(svinst->event, "sieve: ");
+	event_add_str(svinst->event, "user", env->username);
+
+	/* Determine domain */
+	if (env->domainname != NULL && *(env->domainname) != '\0')
+		domain = env->domainname;
+	else {
+		/* Fall back to parsing username localpart@domain */
+		domain = svinst->username == NULL ? NULL :
+			strchr(svinst->username, '@');
+		if (domain == NULL || *(domain+1) == '\0') {
+			/* Fall back to parsing hostname host.domain */
+			domain = (env->hostname != NULL ?
+				  strchr(env->hostname, '.') : NULL);
+			if (domain == NULL || *(domain+1) == '\0' ||
+			    strchr(domain+1, '.') == NULL) {
+				/* Fall back to bare hostname */
+				domain = env->hostname;
+			} else {
+				domain++;
+			}
+		} else {
+			domain++;
+		}
+	}
+	svinst->hostname = p_strdup_empty(pool, env->hostname);
+	svinst->domainname = p_strdup(pool, domain);
+
+	sieve_errors_init(svinst);
+
+	e_debug(svinst->event, "%s version %s initializing",
+		PIGEONHOLE_NAME, PIGEONHOLE_VERSION_FULL);
+
+	/* Read configuration */
+
+	sieve_settings_load(svinst);
+
+	/* Initialize extensions */
+	if (!sieve_extensions_init(svinst)) {
+		sieve_deinit(&svinst);
+		return NULL;
+	}
+
+	/* Initialize storage classes */
+	sieve_storages_init(svinst);
+
+	/* Initialize plugins */
+	sieve_plugins_load(svinst, NULL, NULL);
+
+	/* Configure extensions */
+	sieve_extensions_configure(svinst);
+
+	return svinst;
+}
+
+void sieve_deinit(struct sieve_instance **_svinst)
+{
+	struct sieve_instance *svinst = *_svinst;
+
+	sieve_plugins_unload(svinst);
+	sieve_storages_deinit(svinst);
+	sieve_extensions_deinit(svinst);
+	sieve_errors_deinit(svinst);
+
+	event_unref(&svinst->event);
+
+	pool_unref(&(svinst)->pool);
+	*_svinst = NULL;
+}
+
+void sieve_set_extensions(struct sieve_instance *svinst, const char *extensions)
+{
+	sieve_extensions_set_string(svinst, extensions, FALSE, FALSE);
+}
+
+const char *
+sieve_get_capabilities(struct sieve_instance *svinst, const char *name)
+{
+	if (name == NULL || *name == '\0')
+		return sieve_extensions_get_string(svinst);
+
+	return sieve_extension_capabilities_get_string(svinst, name);
+}
+
+struct event *sieve_get_event(struct sieve_instance *svinst)
+{
+	return svinst->event;
+}
+
+/*
+ * Low-level compiler functions
+ */
+
+struct sieve_ast *
+sieve_parse(struct sieve_script *script, struct sieve_error_handler *ehandler,
+	    enum sieve_error *error_r)
+{
+	struct sieve_parser *parser;
+	struct sieve_ast *ast = NULL;
+
+	/* Parse */
+	parser = sieve_parser_create(script, ehandler, error_r);
+	if (parser == NULL)
+		return NULL;
+
+ 	if (!sieve_parser_run(parser, &ast))
+ 		ast = NULL;
+ 	else
+		sieve_ast_ref(ast);
+
+	sieve_parser_free(&parser);
+
+	if (error_r != NULL) {
+		if (ast == NULL)
+			*error_r = SIEVE_ERROR_NOT_VALID;
+		else
+			*error_r = SIEVE_ERROR_NONE;
+	}
+	return ast;
+}
+
+bool sieve_validate(struct sieve_ast *ast, struct sieve_error_handler *ehandler,
+		    enum sieve_compile_flags flags, enum sieve_error *error_r)
+{
+	bool result = TRUE;
+	struct sieve_validator *validator =
+		sieve_validator_create(ast, ehandler, flags);
+
+	if (!sieve_validator_run(validator))
+		result = FALSE;
+
+	sieve_validator_free(&validator);
+
+	if (error_r != NULL) {
+		if (!result)
+			*error_r = SIEVE_ERROR_NOT_VALID;
+		else
+			*error_r = SIEVE_ERROR_NONE;
+	}
+	return result;
+}
+
+static struct sieve_binary *
+sieve_generate(struct sieve_ast *ast, struct sieve_error_handler *ehandler,
+	       enum sieve_compile_flags flags, enum sieve_error *error_r)
+{
+	struct sieve_generator *generator =
+		sieve_generator_create(ast, ehandler, flags);
+	struct sieve_binary *sbin = NULL;
+
+	sbin = sieve_generator_run(generator, NULL);
+
+	sieve_generator_free(&generator);
+
+	if (error_r != NULL) {
+		if (sbin == NULL)
+			*error_r = SIEVE_ERROR_NOT_VALID;
+		else
+			*error_r = SIEVE_ERROR_NONE;
+	}
+	return sbin;
+}
+
+/*
+ * Sieve compilation
+ */
+
+struct sieve_binary *
+sieve_compile_script(struct sieve_script *script,
+		     struct sieve_error_handler *ehandler,
+		     enum sieve_compile_flags flags,
+		     enum sieve_error *error_r)
+{
+	struct sieve_ast *ast;
+	struct sieve_binary *sbin;
+	enum sieve_error error, *errorp;
+
+	if (error_r != NULL)
+		errorp = error_r;
+	else
+		errorp = &error;
+	*errorp = SIEVE_ERROR_NONE;
+
+	/* Parse */
+	ast = sieve_parse(script, ehandler, errorp);
+	if (ast == NULL) {
+		switch (*errorp) {
+		case SIEVE_ERROR_NOT_FOUND:
+			if (error_r == NULL) {
+				sieve_error(ehandler, sieve_script_name(script),
+					    "script not found");
+			}
+			break;
+		default:
+			sieve_error(ehandler, sieve_script_name(script),
+				    "parse failed");
+		}
+		return NULL;
+	}
+
+	/* Validate */
+	if (!sieve_validate(ast, ehandler, flags, errorp)) {
+		sieve_error(ehandler, sieve_script_name(script),
+			    "validation failed");
+
+ 		sieve_ast_unref(&ast);
+ 		return NULL;
+ 	}
+
+	/* Generate */
+	sbin = sieve_generate(ast, ehandler, flags, errorp);
+	if (sbin == NULL) {
+		sieve_error(ehandler, sieve_script_name(script),
+			    "code generation failed");
+		sieve_ast_unref(&ast);
+		return NULL;
+	}
+
+	/* Cleanup */
+	sieve_ast_unref(&ast);
+	return sbin;
+}
+
+struct sieve_binary *
+sieve_compile(struct sieve_instance *svinst, const char *script_location,
+	      const char *script_name, struct sieve_error_handler *ehandler,
+	      enum sieve_compile_flags flags, enum sieve_error *error_r)
+{
+	struct sieve_script *script;
+	struct sieve_binary *sbin;
+	enum sieve_error error;
+
+	script = sieve_script_create_open(svinst, script_location,
+					  script_name, &error);
+	if (script == NULL) {
+		if (error_r != NULL)
+			*error_r = error;
+		switch (error) {
+		case SIEVE_ERROR_NOT_FOUND:
+			sieve_error(ehandler, script_name, "script not found");
+			break;
+		default:
+			sieve_internal_error(ehandler, script_name,
+					     "failed to open script");
+		}
+		return NULL;
+	}
+
+	sbin = sieve_compile_script(script, ehandler, flags, error_r);
+	if (sbin != NULL) {
+		e_debug(svinst->event,
+			"Script `%s' from %s successfully compiled",
+			sieve_script_name(script),
+			sieve_script_location(script));
+	}
+
+	sieve_script_unref(&script);
+	return sbin;
+}
+
+/*
+ * Sieve runtime
+ */
+
+static int
+sieve_run(struct sieve_binary *sbin, struct sieve_result *result,
+	  struct sieve_execute_env *eenv, struct sieve_error_handler *ehandler)
+{
+	struct sieve_interpreter *interp;
+	int ret = 0;
+
+	/* Create the interpreter */
+	interp = sieve_interpreter_create(sbin, NULL, eenv, ehandler);
+	if (interp == NULL)
+		return SIEVE_EXEC_BIN_CORRUPT;
+
+	/* Run the interpreter */
+	ret = sieve_interpreter_run(interp, result);
+
+	/* Free the interpreter */
+	sieve_interpreter_free(&interp);
+
+	return ret;
+}
+
+/*
+ * Reading/writing sieve binaries
+ */
+
+struct sieve_binary *
+sieve_load(struct sieve_instance *svinst, const char *bin_path,
+	   enum sieve_error *error_r)
+{
+	return sieve_binary_open(svinst, bin_path, NULL, error_r);
+}
+
+static struct sieve_binary *
+sieve_open_script_real(struct sieve_script *script,
+		       struct sieve_error_handler *ehandler,
+		       enum sieve_compile_flags flags,
+		       enum sieve_error *error_r)
+{
+	struct sieve_instance *svinst = sieve_script_svinst(script);
+	struct sieve_resource_usage rusage;
+	struct sieve_binary *sbin;
+	enum sieve_error error;
+	const char *errorstr = NULL;
+	int ret;
+
+	if (error_r == NULL)
+		error_r = &error;
+
+	sieve_resource_usage_init(&rusage);
+
+	/* Try to open the matching binary */
+	sbin = sieve_script_binary_load(script, error_r);
+	if (sbin != NULL) {
+		sieve_binary_get_resource_usage(sbin, &rusage);
+
+		/* Ok, it exists; now let's see if it is up to date */
+		if (!sieve_resource_usage_is_excessive(svinst, &rusage) &&
+		    !sieve_binary_up_to_date(sbin, flags)) {
+			/* Not up to date */
+			e_debug(svinst->event,
+				"Script binary %s is not up-to-date",
+				sieve_binary_path(sbin));
+			sieve_binary_close(&sbin);
+		}
+	}
+
+	/* If the binary does not exist or is not up-to-date, we need
+	 * to (re-)compile.
+	 */
+	if (sbin != NULL) {
+		e_debug(svinst->event,
+			"Script binary %s successfully loaded",
+			sieve_binary_path(sbin));
+	} else {
+		sbin = sieve_compile_script(script, ehandler, flags, error_r);
+		if (sbin == NULL)
+			return NULL;
+
+		e_debug(svinst->event,
+			"Script `%s' from %s successfully compiled",
+			sieve_script_name(script),
+			sieve_script_location(script));
+
+		sieve_binary_set_resource_usage(sbin, &rusage);
+	}
+
+	/* Check whether binary can be executed. */
+	ret = sieve_binary_check_executable(sbin, error_r, &errorstr);
+	if (ret <= 0) {
+		const char *path = sieve_binary_path(sbin);
+
+		if (path != NULL) {
+			e_debug(svinst->event,
+				"Script binary %s cannot be executed",
+				path);
+		} else {
+			e_debug(svinst->event,
+				"Script binary from %s cannot be executed",
+				sieve_binary_source(sbin));
+		}
+		if (ret < 0) {
+			sieve_internal_error(ehandler,
+					     sieve_script_name(script),
+					     "failed to open script");
+		} else {
+			sieve_error(ehandler, sieve_script_name(script),
+				    "%s", errorstr);
+		}
+		sieve_binary_close(&sbin);
+	}
+
+	return sbin;
+}
+
+struct sieve_binary *
+sieve_open_script(struct sieve_script *script,
+		  struct sieve_error_handler *ehandler,
+		  enum sieve_compile_flags flags, enum sieve_error *error_r)
+{
+	struct sieve_binary *sbin;
+
+	T_BEGIN {
+		sbin = sieve_open_script_real(script, ehandler, flags, error_r);
+	} T_END;
+
+	return sbin;
+}
+
+struct sieve_binary *
+sieve_open(struct sieve_instance *svinst, const char *script_location,
+	   const char *script_name, struct sieve_error_handler *ehandler,
+	   enum sieve_compile_flags flags, enum sieve_error *error_r)
+{
+	struct sieve_script *script;
+	struct sieve_binary *sbin;
+	enum sieve_error error;
+
+	/* First open the scriptfile itself */
+	script = sieve_script_create_open(svinst, script_location,
+					  script_name, &error);
+	if (script == NULL) {
+		/* Failed */
+		if (error_r != NULL)
+			*error_r = error;
+		switch (error) {
+		case SIEVE_ERROR_NOT_FOUND:
+			sieve_error(ehandler, script_name, "script not found");
+			break;
+		default:
+			sieve_internal_error(ehandler, script_name,
+					     "failed to open script");
+		}
+		return NULL;
+	}
+
+	sbin = sieve_open_script(script, ehandler, flags, error_r);
+
+	/* Drop script reference, if sbin != NULL it holds a reference of its own.
+	 * Otherwise the script object is freed here.
+	 */
+	sieve_script_unref(&script);
+
+	return sbin;
+}
+
+const char *sieve_get_source(struct sieve_binary *sbin)
+{
+	return sieve_binary_source(sbin);
+}
+
+bool sieve_is_loaded(struct sieve_binary *sbin)
+{
+	return sieve_binary_loaded(sbin);
+}
+
+int sieve_save_as(struct sieve_binary *sbin, const char *bin_path, bool update,
+		  mode_t save_mode, enum sieve_error *error_r)
+{
+	if (bin_path == NULL)
+		return sieve_save(sbin, update, error_r);
+
+	return sieve_binary_save(sbin, bin_path, update, save_mode, error_r);
+}
+
+int sieve_save(struct sieve_binary *sbin, bool update,
+	       enum sieve_error *error_r)
+{
+	struct sieve_script *script = sieve_binary_script(sbin);
+
+	if (script == NULL)
+		return sieve_binary_save(sbin, NULL, update, 0600, error_r);
+
+	return sieve_script_binary_save(script, sbin, update, error_r);
+}
+
+bool sieve_record_resource_usage(struct sieve_binary *sbin,
+				 const struct sieve_resource_usage *rusage)
+{
+	return sieve_binary_record_resource_usage(sbin, rusage);
+}
+
+int sieve_check_executable(struct sieve_binary *sbin,
+			   enum sieve_error *error_r,
+			   const char **client_error_r)
+{
+	return sieve_binary_check_executable(sbin, error_r, client_error_r);
+}
+
+void sieve_close(struct sieve_binary **_sbin)
+{
+	sieve_binary_close(_sbin);
+}
+
+/*
+ * Debugging
+ */
+
+void sieve_dump(struct sieve_binary *sbin, struct ostream *stream, bool verbose)
+{
+	struct sieve_binary_dumper *dumpr = sieve_binary_dumper_create(sbin);
+
+	sieve_binary_dumper_run(dumpr, stream, verbose);
+
+	sieve_binary_dumper_free(&dumpr);
+}
+
+void sieve_hexdump(struct sieve_binary *sbin, struct ostream *stream)
+{
+	struct sieve_binary_dumper *dumpr = sieve_binary_dumper_create(sbin);
+
+	sieve_binary_dumper_hexdump(dumpr, stream);
+
+	sieve_binary_dumper_free(&dumpr);
+}
+
+int sieve_test(struct sieve_binary *sbin,
+	       const struct sieve_message_data *msgdata,
+	       const struct sieve_script_env *senv,
+	       struct sieve_error_handler *ehandler, struct ostream *stream,
+	       enum sieve_execute_flags flags)
+{
+	struct sieve_instance *svinst = sieve_binary_svinst(sbin);
+	struct sieve_result *result;
+	struct sieve_execute_env eenv;
+	pool_t pool;
+	int ret;
+
+	pool = pool_alloconly_create("sieve execution", 4096);
+	sieve_execute_init(&eenv, svinst, pool, msgdata, senv, flags);
+
+	/* Create result object */
+	result = sieve_result_create(svinst, pool, &eenv);
+
+	/* Run the script */
+	ret = sieve_run(sbin, result, &eenv, ehandler);
+
+	/* Print result if successful */
+	if (ret > 0) {
+		ret = (sieve_result_print(result, senv, stream, NULL) ?
+		       SIEVE_EXEC_OK : SIEVE_EXEC_FAILURE);
+	}
+
+	/* Cleanup */
+	if (result != NULL)
+		sieve_result_unref(&result);
+	sieve_execute_deinit(&eenv);
+	pool_unref(&pool);
+
+	return ret;
+}
+
+/*
+ * Script execution
+ */
+
+int sieve_script_env_init(struct sieve_script_env *senv, struct mail_user *user,
+			  const char **error_r)
+{
+	const struct message_address *postmaster;
+	const char *error;
+
+	if (!mail_user_get_postmaster_address(user, &postmaster, &error)) {
+		*error_r = t_strdup_printf(
+			"Invalid postmaster_address: %s", error);
+		return -1;
+	}
+
+	i_zero(senv);
+	senv->user = user;
+	senv->postmaster_address = postmaster;
+	return 0;
+}
+
+int sieve_execute(struct sieve_binary *sbin,
+		  const struct sieve_message_data *msgdata,
+		  const struct sieve_script_env *senv,
+		  struct sieve_error_handler *exec_ehandler,
+		  struct sieve_error_handler *action_ehandler,
+		  enum sieve_execute_flags flags)
+{
+	struct sieve_instance *svinst = sieve_binary_svinst(sbin);
+	struct sieve_result *result = NULL;
+	struct sieve_result_execution *rexec;
+	struct sieve_execute_env eenv;
+	pool_t pool;
+	int ret;
+
+	pool = pool_alloconly_create("sieve execution", 4096);
+	sieve_execute_init(&eenv, svinst, pool, msgdata, senv, flags);
+
+	/* Create result object */
+	result = sieve_result_create(svinst, pool, &eenv);
+
+	/* Run the script */
+	ret = sieve_run(sbin, result, &eenv, exec_ehandler);
+
+	rexec = sieve_result_execution_create(result, pool);
+
+	/* Evaluate status and execute the result:
+	   Strange situations, e.g. currupt binaries, must be handled by the
+	   caller. In that case no implicit keep is attempted, because the
+	   situation may be resolved.
+	 */
+	ret = sieve_result_execute(rexec, ret, TRUE, action_ehandler, NULL);
+
+	sieve_result_execution_destroy(&rexec);
+
+	/* Cleanup */
+	if (result != NULL)
+		sieve_result_unref(&result);
+	sieve_execute_finish(&eenv, ret);
+	sieve_execute_deinit(&eenv);
+	pool_unref(&pool);
+
+	return ret;
+}
+
+/*
+ * Multiscript support
+ */
+
+struct sieve_multiscript {
+	pool_t pool;
+	struct sieve_execute_env exec_env;
+	struct sieve_result *result;
+	struct sieve_result_execution *rexec;
+	struct event *event;
+
+	int status;
+	bool keep;
+
+	struct ostream *teststream;
+
+	bool active:1;
+	bool discard_handled:1;
+};
+
+struct sieve_multiscript *
+sieve_multiscript_start_execute(struct sieve_instance *svinst,
+				const struct sieve_message_data *msgdata,
+				const struct sieve_script_env *senv)
+{
+	pool_t pool;
+	struct sieve_result *result;
+	struct sieve_multiscript *mscript;
+
+	pool = pool_alloconly_create("sieve execution", 4096);
+	mscript = p_new(pool, struct sieve_multiscript, 1);
+	mscript->pool = pool;
+	sieve_execute_init(&mscript->exec_env, svinst, pool, msgdata, senv, 0);
+
+	mscript->event = event_create(mscript->exec_env.event);
+	event_set_append_log_prefix(mscript->event, "multi-script: ");
+
+	result = sieve_result_create(svinst, pool, &mscript->exec_env);
+	sieve_result_set_keep_action(result, NULL, NULL);
+	mscript->result = result;
+
+	mscript->rexec = sieve_result_execution_create(result, pool);
+
+	mscript->status = SIEVE_EXEC_OK;
+	mscript->active = TRUE;
+	mscript->keep = TRUE;
+
+	e_debug(mscript->event, "Start execute sequence");
+
+	return mscript;
+}
+
+static void sieve_multiscript_destroy(struct sieve_multiscript **_mscript)
+{
+	struct sieve_multiscript *mscript = *_mscript;
+
+	if (mscript == NULL)
+		return;
+	*_mscript = NULL;
+
+	e_debug(mscript->event, "Destroy");
+
+	event_unref(&mscript->event);
+
+	sieve_result_execution_destroy(&mscript->rexec);
+	sieve_result_unref(&mscript->result);
+	sieve_execute_deinit(&mscript->exec_env);
+	pool_unref(&mscript->pool);
+}
+
+struct sieve_multiscript *
+sieve_multiscript_start_test(struct sieve_instance *svinst,
+			     const struct sieve_message_data *msgdata,
+			     const struct sieve_script_env *senv,
+			     struct ostream *stream)
+{
+	struct sieve_multiscript *mscript =
+		sieve_multiscript_start_execute(svinst, msgdata, senv);
+
+	mscript->teststream = stream;
+
+	return mscript;
+}
+
+static void
+sieve_multiscript_test(struct sieve_multiscript *mscript)
+{
+	const struct sieve_script_env *senv = mscript->exec_env.scriptenv;
+
+	e_debug(mscript->event, "Test result");
+
+	if (mscript->status > 0) {
+		mscript->status =
+			(sieve_result_print(mscript->result, senv,
+					    mscript->teststream,
+					    &mscript->keep) ?
+			 SIEVE_EXEC_OK : SIEVE_EXEC_FAILURE);
+	} else {
+		mscript->keep = TRUE;
+	}
+
+	sieve_result_mark_executed(mscript->result);
+}
+
+static void
+sieve_multiscript_execute(struct sieve_multiscript *mscript,
+			  struct sieve_error_handler *ehandler,
+			  enum sieve_execute_flags flags)
+{
+	e_debug(mscript->event, "Execute result");
+
+	mscript->exec_env.flags = flags;
+
+	if (mscript->status > 0) {
+		mscript->status = sieve_result_execute(mscript->rexec,
+						       SIEVE_EXEC_OK, FALSE,
+						       ehandler,
+						       &mscript->keep);
+	}
+}
+
+bool sieve_multiscript_run(struct sieve_multiscript *mscript,
+			   struct sieve_binary *sbin,
+			   struct sieve_error_handler *exec_ehandler,
+			   struct sieve_error_handler *action_ehandler,
+			   enum sieve_execute_flags flags)
+{
+	if (!mscript->active) {
+		e_debug(mscript->event, "Sequence ended");
+		return FALSE;
+	}
+
+	e_debug(mscript->event, "Run script `%s'", sieve_binary_source(sbin));
+
+	/* Run the script */
+	mscript->exec_env.flags = flags;
+	mscript->status = sieve_run(sbin, mscript->result, &mscript->exec_env,
+				    exec_ehandler);
+
+	if (mscript->status >= 0) {
+		mscript->keep = FALSE;
+
+		if (mscript->teststream != NULL)
+			sieve_multiscript_test(mscript);
+		else {
+			sieve_multiscript_execute(mscript, action_ehandler,
+						  flags);
+		}
+		if (!mscript->keep)
+			mscript->active = FALSE;
+	}
+
+	if (!mscript->active || mscript->status <= 0) {
+		e_debug(mscript->event, "Sequence ended");
+		mscript->active = FALSE;
+		return FALSE;
+	}
+
+	e_debug(mscript->event, "Sequence active");
+	return TRUE;
+}
+
+bool sieve_multiscript_will_discard(struct sieve_multiscript *mscript)
+{
+	return (!mscript->active && mscript->status == SIEVE_EXEC_OK &&
+		!sieve_result_executed_delivery(mscript->rexec));
+}
+
+void sieve_multiscript_run_discard(struct sieve_multiscript *mscript,
+				   struct sieve_binary *sbin,
+				   struct sieve_error_handler *exec_ehandler,
+				   struct sieve_error_handler *action_ehandler,
+				   enum sieve_execute_flags flags)
+{
+	if (!sieve_multiscript_will_discard(mscript)) {
+		e_debug(mscript->event, "Not running discard script");
+		return;
+	}
+	i_assert(!mscript->discard_handled);
+
+	e_debug(mscript->event, "Run discard script `%s'",
+		sieve_binary_source(sbin));
+
+	sieve_result_set_keep_action(mscript->result, NULL, &act_store);
+
+	/* Run the discard script */
+	flags |= SIEVE_EXECUTE_FLAG_DEFER_KEEP;
+	mscript->exec_env.flags = flags;
+	mscript->status = sieve_run(sbin, mscript->result, &mscript->exec_env,
+				    exec_ehandler);
+
+	if (mscript->status >= 0) {
+		mscript->keep = FALSE;
+
+		if (mscript->teststream != NULL)
+			sieve_multiscript_test(mscript);
+		else {
+			sieve_multiscript_execute(mscript, action_ehandler,
+						  flags);
+		}
+		if (mscript->status == SIEVE_EXEC_FAILURE)
+			mscript->status = SIEVE_EXEC_KEEP_FAILED;
+		mscript->active = FALSE;
+	}
+
+	mscript->discard_handled = TRUE;
+}
+
+int sieve_multiscript_status(struct sieve_multiscript *mscript)
+{
+	return mscript->status;
+}
+
+int sieve_multiscript_finish(struct sieve_multiscript **_mscript,
+			     struct sieve_error_handler *action_ehandler,
+			     enum sieve_execute_flags flags, int status)
+{
+	struct sieve_multiscript *mscript = *_mscript;
+
+	if (mscript == NULL)
+		return SIEVE_EXEC_OK;
+	*_mscript = NULL;
+
+	switch (status) {
+	case SIEVE_EXEC_OK:
+		status = mscript->status;
+		break;
+	case SIEVE_EXEC_TEMP_FAILURE:
+		break;
+	case SIEVE_EXEC_BIN_CORRUPT:
+	case SIEVE_EXEC_FAILURE:
+	case SIEVE_EXEC_KEEP_FAILED:
+	case SIEVE_EXEC_RESOURCE_LIMIT:
+		if (mscript->status == SIEVE_EXEC_TEMP_FAILURE)
+			status = mscript->status;
+		break;
+	}
+
+	e_debug(mscript->event, "Finishing sequence (status=%s)",
+		sieve_execution_exitcode_to_str(status));
+
+	mscript->exec_env.flags = flags;
+	sieve_result_set_keep_action(mscript->result, NULL, &act_store);
+
+	mscript->keep = FALSE;
+	if (mscript->teststream != NULL)
+		mscript->keep = TRUE;
+	else {
+		status = sieve_result_execute(
+			mscript->rexec, status, TRUE, action_ehandler,
+			&mscript->keep);
+	}
+
+	e_debug(mscript->event, "Sequence finished (status=%s, keep=%s)",
+		sieve_execution_exitcode_to_str(status),
+		(mscript->keep ? "yes" : "no"));
+
+	sieve_execute_finish(&mscript->exec_env, status);
+
+	/* Cleanup */
+	sieve_multiscript_destroy(&mscript);
+
+	return status;
+}
+
+/*
+ * Configured Limits
+ */
+
+unsigned int sieve_max_redirects(struct sieve_instance *svinst)
+{
+	return svinst->max_redirects;
+}
+
+unsigned int sieve_max_actions(struct sieve_instance *svinst)
+{
+	return svinst->max_actions;
+}
+
+size_t sieve_max_script_size(struct sieve_instance *svinst)
+{
+	return svinst->max_script_size;
+}
+
+/*
+ * User log
+ */
+
+const char *
+sieve_user_get_log_path(struct sieve_instance *svinst,
+			struct sieve_script *user_script)
+{
+	const char *log_path = NULL;
+
+	/* Determine user log file path */
+	log_path = sieve_setting_get(svinst, "sieve_user_log");
+	if (log_path == NULL) {
+		const char *path;
+
+		if (user_script == NULL ||
+		    (path = sieve_file_script_get_path(user_script)) == NULL) {
+			/* Default */
+			if (svinst->home_dir != NULL) {
+				log_path = t_strconcat(
+					svinst->home_dir, "/.dovecot.sieve.log",
+					NULL);
+			}
+		} else {
+			/* Use script file as a base (legacy behavior) */
+			log_path = t_strconcat(path, ".log", NULL);
+		}
+	} else if (svinst->home_dir != NULL) {
+		/* Expand home dir if necessary */
+		if (log_path[0] == '~') {
+			log_path = home_expand_tilde(log_path,
+						     svinst->home_dir);
+		} else if (log_path[0] != '/') {
+			log_path = t_strconcat(svinst->home_dir, "/",
+					       log_path, NULL);
+		}
+	}
+	return log_path;
+}
+
+/*
+ * Script trace log
+ */
+
+struct sieve_trace_log {
+	struct ostream *output;
+};
+
+int sieve_trace_log_create(struct sieve_instance *svinst, const char *path,
+			   struct sieve_trace_log **trace_log_r)
+{
+	struct sieve_trace_log *trace_log;
+	struct ostream *output;
+	int fd;
+
+	*trace_log_r = NULL;
+
+	if (path == NULL)
+		output = o_stream_create_fd(1, 0);
+	else {
+		fd = open(path, O_CREAT | O_APPEND | O_WRONLY, 0600);
+		if (fd == -1) {
+			e_error(svinst->event, "trace: "
+				"creat(%s) failed: %m", path);
+			return -1;
+		}
+		output = o_stream_create_fd_autoclose(&fd, 0);
+		o_stream_set_name(output, path);
+	}
+
+	trace_log = i_new(struct sieve_trace_log, 1);
+	trace_log->output = output;
+
+	*trace_log_r = trace_log;
+	return 0;
+}
+
+int sieve_trace_log_create_dir(struct sieve_instance *svinst, const char *dir,
+			       struct sieve_trace_log **trace_log_r)
+{
+	static unsigned int counter = 0;
+	const char *timestamp, *prefix;
+	struct stat st;
+
+	*trace_log_r = NULL;
+
+	if (stat(dir, &st) < 0) {
+		if (errno != ENOENT && errno != EACCES) {
+			e_error(svinst->event, "trace: "
+				"stat(%s) failed: %m", dir);
+		}
+		return -1;
+	}
+
+	timestamp = t_strflocaltime("%Y%m%d-%H%M%S", ioloop_time);
+
+	counter++;
+
+	prefix = t_strdup_printf("%s/%s.%s.%u.trace",
+				 dir, timestamp, my_pid, counter);
+	return sieve_trace_log_create(svinst, prefix, trace_log_r);
+}
+
+int sieve_trace_log_open(struct sieve_instance *svinst,
+			 struct sieve_trace_log **trace_log_r)
+{
+	const char *trace_dir =
+		sieve_setting_get(svinst, "sieve_trace_dir");
+
+	*trace_log_r = NULL;
+	if (trace_dir == NULL)
+		return -1;
+
+	if (svinst->home_dir != NULL) {
+		/* Expand home dir if necessary */
+		if (trace_dir[0] == '~') {
+			trace_dir = home_expand_tilde(trace_dir,
+						      svinst->home_dir);
+		} else if (trace_dir[0] != '/') {
+			trace_dir = t_strconcat(svinst->home_dir, "/",
+						trace_dir, NULL);
+		}
+	}
+
+	return sieve_trace_log_create_dir(svinst, trace_dir, trace_log_r);
+}
+
+void sieve_trace_log_write_line(struct sieve_trace_log *trace_log,
+				const string_t *line)
+{
+	struct const_iovec iov[2];
+
+	if (line == NULL) {
+		o_stream_nsend_str(trace_log->output, "\n");
+		return;
+	}
+
+	memset(iov, 0, sizeof(iov));
+	iov[0].iov_base = str_data(line);
+	iov[0].iov_len = str_len(line);
+	iov[1].iov_base = "\n";
+	iov[1].iov_len = 1;
+	o_stream_nsendv(trace_log->output, iov, 2);
+}
+
+void sieve_trace_log_printf(struct sieve_trace_log *trace_log,
+			    const char *fmt, ...)
+{
+	va_list args;
+
+	va_start(args, fmt);
+	T_BEGIN {
+		o_stream_nsend_str(trace_log->output,
+				   t_strdup_vprintf(fmt, args));
+	} T_END;
+	va_end(args);
+}
+
+void sieve_trace_log_free(struct sieve_trace_log **_trace_log)
+{
+	struct sieve_trace_log *trace_log = *_trace_log;
+
+	*_trace_log = NULL;
+
+	if (o_stream_finish(trace_log->output) < 0) {
+		i_error("write(%s) failed: %s",
+			o_stream_get_name(trace_log->output),
+			o_stream_get_error(trace_log->output));
+	}
+	o_stream_destroy(&trace_log->output);
+	i_free(trace_log);
+}
+
+int sieve_trace_config_get(struct sieve_instance *svinst,
+			   struct sieve_trace_config *tr_config)
+{
+	const char *tr_level =
+		sieve_setting_get(svinst, "sieve_trace_level");
+	bool tr_debug, tr_addresses;
+
+	i_zero(tr_config);
+
+	if (tr_level == NULL || *tr_level == '\0' ||
+	    strcasecmp(tr_level, "none") == 0)
+		return -1;
+
+	if (strcasecmp(tr_level, "actions") == 0)
+		tr_config->level = SIEVE_TRLVL_ACTIONS;
+	else if (strcasecmp(tr_level, "commands") == 0)
+		tr_config->level = SIEVE_TRLVL_COMMANDS;
+	else if (strcasecmp(tr_level, "tests") == 0)
+		tr_config->level = SIEVE_TRLVL_TESTS;
+	else if (strcasecmp(tr_level, "matching") == 0)
+		tr_config->level = SIEVE_TRLVL_MATCHING;
+	else {
+		e_error(svinst->event, "Unknown trace level: %s", tr_level);
+		return -1;
+	}
+
+	tr_debug = FALSE;
+	(void)sieve_setting_get_bool_value(svinst, "sieve_trace_debug",
+					   &tr_debug);
+	tr_addresses = FALSE;
+	(void)sieve_setting_get_bool_value(svinst, "sieve_trace_addresses",
+					   &tr_addresses);
+
+	if (tr_debug)
+		tr_config->flags |= SIEVE_TRFLG_DEBUG;
+	if (tr_addresses)
+		tr_config->flags |= SIEVE_TRFLG_ADDRESSES;
+	return 0;
+}
+
+/*
+ * Execution exit codes
+ */
+
+const char *sieve_execution_exitcode_to_str(int code)
+{
+	switch (code) {
+	case SIEVE_EXEC_OK:
+		return "ok";
+	case SIEVE_EXEC_FAILURE:
+		return "failure";
+	case SIEVE_EXEC_TEMP_FAILURE:
+		return "temporary_failure";
+	case SIEVE_EXEC_BIN_CORRUPT:
+		return "binary_corrupt";
+	case SIEVE_EXEC_KEEP_FAILED:
+		return "keep_failed";
+	case SIEVE_EXEC_RESOURCE_LIMIT:
+		return "resource_limit";
+	}
+	i_unreached();
+}
+
+/*
+ * User e-mail address
+ */
+
+const struct smtp_address *sieve_get_user_email(struct sieve_instance *svinst)
+{
+	struct smtp_address *address;
+	const char *username = svinst->username;
+
+	if (svinst->user_email_implicit != NULL)
+		return svinst->user_email_implicit;
+	if (svinst->user_email != NULL)
+		return svinst->user_email;
+
+	if (smtp_address_parse_mailbox(svinst->pool, username, 0,
+				       &address, NULL) >= 0) {
+		svinst->user_email_implicit = address;
+		return svinst->user_email_implicit;
+	}
+
+	if (svinst->domainname != NULL) {
+		svinst->user_email_implicit = smtp_address_create(
+			svinst->pool, username, svinst->domainname);
+		return svinst->user_email_implicit;
+	}
+	return NULL;
+}
+
+/*
+ * Postmaster address
+ */
+
+const struct message_address *
+sieve_get_postmaster(const struct sieve_script_env *senv)
+{
+	i_assert(senv->postmaster_address != NULL);
+	return senv->postmaster_address;
+}
+
+const struct smtp_address *
+sieve_get_postmaster_smtp(const struct sieve_script_env *senv)
+{
+	struct smtp_address *addr;
+	int ret;
+
+	ret = smtp_address_create_from_msg_temp(
+		sieve_get_postmaster(senv), &addr);
+	i_assert(ret >= 0);
+	return addr;
+}
+
+const char *sieve_get_postmaster_address(const struct sieve_script_env *senv)
+{
+	const struct message_address *postmaster =
+		sieve_get_postmaster(senv);
+	string_t *addr = t_str_new(256);
+
+	message_address_write(addr, postmaster);
+	return str_c(addr);
+}
+
+/*
+ * Resource usage
+ */
+
+void sieve_resource_usage_init(struct sieve_resource_usage *rusage_r)
+{
+	i_zero(rusage_r);
+}
+
+void sieve_resource_usage_add(struct sieve_resource_usage *dst,
+			      const struct sieve_resource_usage *src)
+{
+	if ((UINT_MAX - dst->cpu_time_msecs) < src->cpu_time_msecs)
+		dst->cpu_time_msecs = UINT_MAX;
+	else
+		dst->cpu_time_msecs += src->cpu_time_msecs;
+}
+
+bool sieve_resource_usage_is_high(struct sieve_instance *svinst ATTR_UNUSED,
+				  const struct sieve_resource_usage *rusage)
+{
+	return (rusage->cpu_time_msecs > SIEVE_HIGH_CPU_TIME_MSECS);
+}
+
+bool sieve_resource_usage_is_excessive(
+	struct sieve_instance *svinst,
+	const struct sieve_resource_usage *rusage)
+{
+	i_assert(svinst->max_cpu_time_secs <= (UINT_MAX / 1000));
+	if (svinst->max_cpu_time_secs == 0)
+		return FALSE;
+	return (rusage->cpu_time_msecs > (svinst->max_cpu_time_secs * 1000));
+}
+
+const char *
+sieve_resource_usage_get_summary(const struct sieve_resource_usage *rusage)
+{
+	if (rusage->cpu_time_msecs == 0)
+		return "no usage recorded";
+
+	return t_strdup_printf("cpu time = %u ms", rusage->cpu_time_msecs);
+}
diff --git a/pigeonhole/src/lib-sieve/sieve.h b/pigeonhole/src/lib-sieve/sieve.h
new file mode 100644
index 0000000..66a6d12
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/sieve.h
@@ -0,0 +1,261 @@
+#ifndef SIEVE_H
+#define SIEVE_H
+
+struct sieve_script;
+struct sieve_binary;
+
+#include "sieve-config.h"
+#include "sieve-types.h"
+#include "sieve-error.h"
+
+/*
+ * Main Sieve library interface
+ */
+
+/* Initialize the sieve engine. Must be called before any sieve functionality is
+   used. */
+struct sieve_instance *
+sieve_init(const struct sieve_environment *env,
+	   const struct sieve_callbacks *callbacks, void *context, bool debug);
+
+/* Free all memory allocated by the sieve engine. */
+void sieve_deinit(struct sieve_instance **_svinst);
+
+/* Get capability string for a particular extension. */
+const char *
+sieve_get_capabilities(struct sieve_instance *svinst, const char *name);
+
+/* Set the supported extensions. The provided string is parsed into a list
+   of extensions that are to be enabled/disabled. */
+void sieve_set_extensions(struct sieve_instance *svinst,
+			  const char *extensions);
+
+
+/* Get top-level event for this Sieve instance. */
+struct event *sieve_get_event(struct sieve_instance *svinst) ATTR_PURE;
+
+/*
+ * Script compilation
+ */
+
+/* Compile a Sieve script from a Sieve script object. Returns Sieve binary upon
+   success and NULL upon failure. */
+struct sieve_binary *
+sieve_compile_script(struct sieve_script *script,
+		     struct sieve_error_handler *ehandler,
+		     enum sieve_compile_flags flags, enum sieve_error *error_r)
+		     ATTR_NULL(2, 4);
+
+/* Compile a Sieve script from a Sieve script location string. Returns Sieve
+   binary upon success and NULL upon failure. The provided script_name is used
+   for the internally created Sieve script object. */
+struct sieve_binary *
+sieve_compile(struct sieve_instance *svinst, const char *script_location,
+	      const char *script_name, struct sieve_error_handler *ehandler,
+	      enum sieve_compile_flags flags, enum sieve_error *error_r)
+	      ATTR_NULL(3, 4, 6);
+
+/*
+ * Reading/writing Sieve binaries
+ */
+
+/* Loads the sieve binary indicated by the provided path. */
+struct sieve_binary *
+sieve_load(struct sieve_instance *svinst, const char *bin_path,
+	   enum sieve_error *error_r);
+/* First tries to open the binary version of the specified script and if it does
+   not exist or if it contains errors, the script is (re-)compiled. Note that
+   errors in the bytecode are caught only at runtime.
+ */
+struct sieve_binary *
+sieve_open_script(struct sieve_script *script,
+		  struct sieve_error_handler *ehandler,
+		  enum sieve_compile_flags flags, enum sieve_error *error_r);
+/* First tries to open the binary version of the specified script and if it does
+   not exist or if it contains errors, the script is (re-)compiled. Note that
+   errors in the bytecode are caught only at runtime.
+ */
+struct sieve_binary *
+sieve_open(struct sieve_instance *svinst, const char *script_location,
+	   const char *script_name, struct sieve_error_handler *ehandler,
+	   enum sieve_compile_flags flags, enum sieve_error *error_r);
+
+/* Record resource usage in the binary cumulatively. The binary is disabled when
+   resource limits are exceeded within a configured timeout. Returns FALSE when
+   resource limits are exceeded. */
+bool ATTR_NOWARN_UNUSED_RESULT
+sieve_record_resource_usage(struct sieve_binary *sbin,
+			    const struct sieve_resource_usage *rusage)
+			    ATTR_NULL(1);
+
+/* Check whether Sieve binary is (still) executable. Returns 1 if all is OK,
+   0 when an error occurred, and -1 when the error is internal. Sets the Sieve
+   error code in error_r and a user error message in client_error_r when the
+   error is not internal. */
+int sieve_check_executable(struct sieve_binary *sbin,
+			   enum sieve_error *error_r,
+			   const char **client_error_r);
+
+/* Saves the binary as the file indicated by the path parameter. This function
+   will not write the binary to disk when the provided binary object was loaded
+   earlier from the indicated bin_path, unless update is TRUE.
+ */
+int sieve_save_as(struct sieve_binary *sbin, const char *bin_path, bool update,
+		  mode_t save_mode, enum sieve_error *error_r);
+
+/* Saves the binary to the default location. This function will not overwrite
+   the binary on disk when the provided binary object was loaded earlier from
+   the default location, unless update is TRUE.
+ */
+int sieve_save(struct sieve_binary *sbin, bool update,
+	       enum sieve_error *error_r);
+
+/* Closes a compiled/opened sieve binary. */
+void sieve_close(struct sieve_binary **_sbin);
+
+/* Obtains the path the binary was compiled or loaded from. */
+const char *sieve_get_source(struct sieve_binary *sbin);
+/* Indicates whether the binary was loaded from a pre-compiled file. */
+bool sieve_is_loaded(struct sieve_binary *sbin);
+
+/*
+ * Debugging
+ */
+
+/* Dumps the byte code in human-readable form to the specified ostream. */
+void sieve_dump(struct sieve_binary *sbin,
+		struct ostream *stream, bool verbose);
+/* Dumps the byte code in hexdump form to the specified ostream. */
+void sieve_hexdump(struct sieve_binary *sbin, struct ostream *stream);
+
+/* Executes the bytecode, but only prints the result to the given stream. */
+int sieve_test(struct sieve_binary *sbin,
+	       const struct sieve_message_data *msgdata,
+	       const struct sieve_script_env *senv,
+	       struct sieve_error_handler *ehandler, struct ostream *stream,
+	       enum sieve_execute_flags flags);
+
+/*
+ * Script execution
+ */
+
+/* Initializes the scirpt environment from the given mail_user. */
+int sieve_script_env_init(struct sieve_script_env *senv, struct mail_user *user,
+			  const char **error_r);
+
+/* Executes the binary, including the result. */
+int sieve_execute(struct sieve_binary *sbin,
+		  const struct sieve_message_data *msgdata,
+		  const struct sieve_script_env *senv,
+		  struct sieve_error_handler *exec_ehandler,
+		  struct sieve_error_handler *action_ehandler,
+		  enum sieve_execute_flags flags);
+
+/*
+ * Multiscript support
+ */
+
+struct sieve_multiscript;
+
+struct sieve_multiscript *
+sieve_multiscript_start_execute(struct sieve_instance *svinst,
+				const struct sieve_message_data *msgdata,
+				const struct sieve_script_env *senv);
+struct sieve_multiscript *
+sieve_multiscript_start_test(struct sieve_instance *svinst,
+			     const struct sieve_message_data *msgdata,
+			     const struct sieve_script_env *senv,
+			     struct ostream *stream);
+
+bool sieve_multiscript_run(struct sieve_multiscript *mscript,
+			   struct sieve_binary *sbin,
+			   struct sieve_error_handler *exec_ehandler,
+			   struct sieve_error_handler *action_ehandler,
+			   enum sieve_execute_flags flags);
+
+bool sieve_multiscript_will_discard(struct sieve_multiscript *mscript);
+void sieve_multiscript_run_discard(struct sieve_multiscript *mscript,
+				   struct sieve_binary *sbin,
+				   struct sieve_error_handler *exec_ehandler,
+				   struct sieve_error_handler *action_ehandler,
+				   enum sieve_execute_flags flags);
+
+int sieve_multiscript_status(struct sieve_multiscript *mscript);
+
+int sieve_multiscript_finish(struct sieve_multiscript **_mscript,
+			     struct sieve_error_handler *action_ehandler,
+			     enum sieve_execute_flags flags, int status);
+
+/*
+ * Configured limits
+ */
+
+unsigned int sieve_max_redirects(struct sieve_instance *svinst);
+unsigned int sieve_max_actions(struct sieve_instance *svinst);
+size_t sieve_max_script_size(struct sieve_instance *svinst);
+
+/*
+ * User log
+ */
+
+const char *sieve_user_get_log_path(struct sieve_instance *svinst,
+				    struct sieve_script *user_script)
+				    ATTR_NULL(2);
+
+/*
+ * Script trace log
+ */
+
+struct sieve_trace_log;
+
+int sieve_trace_log_create(struct sieve_instance *svinst, const char *path,
+			   struct sieve_trace_log **trace_log_r) ATTR_NULL(2);
+int sieve_trace_log_create_dir(struct sieve_instance *svinst, const char *dir,
+			       struct sieve_trace_log **trace_log_r)
+			       ATTR_NULL(3);
+
+int sieve_trace_log_open(struct sieve_instance *svinst,
+			 struct sieve_trace_log **trace_log_r) ATTR_NULL(2);
+
+void sieve_trace_log_printf(struct sieve_trace_log *trace_log,
+			    const char *fmt, ...) ATTR_FORMAT(2, 3);
+
+void sieve_trace_log_free(struct sieve_trace_log **_trace_log);
+
+int sieve_trace_config_get(struct sieve_instance *svinst,
+			   struct sieve_trace_config *tr_config);
+
+/*
+ * Execution exit codes
+ */
+
+const char *sieve_execution_exitcode_to_str(int code);
+
+/*
+ * Resource usage
+ */
+
+/* Initialize the resource usage struct, clearing all usage statistics. */
+void sieve_resource_usage_init(struct sieve_resource_usage *rusage_r);
+
+/* Calculate the sum of the provided resource usage statistics, writing the
+   result to the first. */
+void sieve_resource_usage_add(struct sieve_resource_usage *dst,
+			      const struct sieve_resource_usage *src);
+
+/* Returns TRUE if the resource usage is sufficiently high to warrant recording
+   for checking cumulative resource limits (across several different script
+   executions). */
+bool sieve_resource_usage_is_high(struct sieve_instance *svinst,
+				  const struct sieve_resource_usage *rusage);
+/* Returns TRUE when the provided resource usage statistics exceed a configured
+   policy limit. */
+bool sieve_resource_usage_is_excessive(
+	struct sieve_instance *svinst,
+	const struct sieve_resource_usage *rusage);
+/* Returns a string containing a description of the resource usage (to be used
+   log messages). */
+const char *
+sieve_resource_usage_get_summary(const struct sieve_resource_usage *rusage);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/storage/Makefile.am b/pigeonhole/src/lib-sieve/storage/Makefile.am
new file mode 100644
index 0000000..ba39e4a
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/Makefile.am
@@ -0,0 +1,5 @@
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diff --git a/pigeonhole/src/lib-sieve/storage/Makefile.in b/pigeonhole/src/lib-sieve/storage/Makefile.in
new file mode 100644
index 0000000..d81c0c5
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/Makefile.in
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+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/lib-sieve/storage/data/Makefile
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+	  *config.status*) \
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+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
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+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4): @MAINTAINER_MODE_TRUE@ $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
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+clean-noinstLTLIBRARIES:
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+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+libsieve_storage_data.la: $(libsieve_storage_data_la_OBJECTS) $(libsieve_storage_data_la_DEPENDENCIES) $(EXTRA_libsieve_storage_data_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(LINK)  $(libsieve_storage_data_la_OBJECTS) $(libsieve_storage_data_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/sieve-data-script.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/sieve-data-storage.Plo@am__quote@ # am--include-marker
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+	-rm -f *.lo
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+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
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+
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+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
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+	    || cp -p $$d/$$file "$(distdir)/$$file" \
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+	-rm -f ./$(DEPDIR)/sieve-data-storage.Plo
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+	distclean-tags
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+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/storage/data/sieve-data-script.c b/pigeonhole/src/lib-sieve/storage/data/sieve-data-script.c
new file mode 100644
index 0000000..2241bc5
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/data/sieve-data-script.c
@@ -0,0 +1,95 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "strfuncs.h"
+#include "istream.h"
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+#include "sieve-dump.h"
+#include "sieve-binary.h"
+
+#include "sieve-data-storage.h"
+
+/*
+ * Script data implementation
+ */
+
+static struct sieve_data_script *sieve_data_script_alloc(void)
+{
+	struct sieve_data_script *dscript;
+	pool_t pool;
+
+	pool = pool_alloconly_create("sieve_data_script", 1024);
+	dscript = p_new(pool, struct sieve_data_script, 1);
+	dscript->script = sieve_data_script;
+	dscript->script.pool = pool;
+
+	return dscript;
+}
+
+struct sieve_script *sieve_data_script_create_from_input
+(struct sieve_instance *svinst, const char *name, struct istream *input)
+{
+	struct sieve_storage *storage;
+	struct sieve_data_script *dscript = NULL;
+
+	storage = sieve_storage_alloc(svinst, NULL, &sieve_data_storage,
+				      "", 0, FALSE);
+
+	dscript = sieve_data_script_alloc();
+	sieve_script_init(&dscript->script,
+		storage, &sieve_data_script, "data:", name);
+
+	dscript->data = input;
+	i_stream_ref(dscript->data);
+
+	sieve_storage_unref(&storage);
+
+	dscript->script.open = TRUE;
+
+	return &dscript->script;
+}
+
+static void sieve_data_script_destroy(struct sieve_script *script)
+{
+	struct sieve_data_script *dscript =
+		(struct sieve_data_script *)script;
+
+	i_stream_unref(&dscript->data);
+}
+
+static int sieve_data_script_get_stream
+(struct sieve_script *script, struct istream **stream_r,
+	enum sieve_error *error_r)
+{
+	struct sieve_data_script *dscript =
+		(struct sieve_data_script *)script;
+
+	i_stream_ref(dscript->data);
+	i_stream_seek(dscript->data, 0);
+
+	*stream_r = dscript->data;
+	*error_r = SIEVE_ERROR_NONE;
+	return 0;
+}
+
+static bool sieve_data_script_equals
+(const struct sieve_script *script ATTR_UNUSED,
+	const struct sieve_script *other ATTR_UNUSED)
+{
+	return ( script == other );
+}
+
+const struct sieve_script sieve_data_script = {
+	.driver_name = SIEVE_DATA_STORAGE_DRIVER_NAME,
+	.v = {
+		.destroy = sieve_data_script_destroy,
+
+		.get_stream = sieve_data_script_get_stream,
+
+		.equals = sieve_data_script_equals
+	}
+};
diff --git a/pigeonhole/src/lib-sieve/storage/data/sieve-data-storage.c b/pigeonhole/src/lib-sieve/storage/data/sieve-data-storage.c
new file mode 100644
index 0000000..21b4f35
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/data/sieve-data-storage.c
@@ -0,0 +1,47 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+
+#include "sieve-data-storage.h"
+
+/*
+ * Storage class
+ */
+
+static struct sieve_storage *sieve_data_storage_alloc(void)
+{
+	struct sieve_data_storage *dstorage;
+	pool_t pool;
+
+	pool = pool_alloconly_create("sieve_data_storage", 1024);
+	dstorage = p_new(pool, struct sieve_data_storage, 1);
+	dstorage->storage = sieve_data_storage;
+	dstorage->storage.pool = pool;
+
+	return &dstorage->storage;
+}
+
+static int sieve_data_storage_init
+(struct sieve_storage *storage ATTR_UNUSED,
+	const char *const *options ATTR_UNUSED,
+	enum sieve_error *error_r ATTR_UNUSED)
+{
+	return 0;
+}
+
+/*
+ * Driver definition
+ */
+
+const struct sieve_storage sieve_data_storage = {
+	.driver_name = SIEVE_DATA_STORAGE_DRIVER_NAME,
+	.version = 0,
+	.v = {
+		.alloc = sieve_data_storage_alloc,
+		.init = sieve_data_storage_init,
+	}
+};
diff --git a/pigeonhole/src/lib-sieve/storage/data/sieve-data-storage.h b/pigeonhole/src/lib-sieve/storage/data/sieve-data-storage.h
new file mode 100644
index 0000000..a200e25
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/data/sieve-data-storage.h
@@ -0,0 +1,30 @@
+#ifndef SIEVE_DATA_STORAGE_H
+#define SIEVE_DATA_STORAGE_H
+
+#include "sieve.h"
+#include "sieve-script-private.h"
+#include "sieve-storage-private.h"
+
+/*
+ * Storage class
+ */
+
+struct sieve_data_storage {
+	struct sieve_storage storage;
+};
+
+/*
+ * Script class
+ */
+
+struct sieve_data_script {
+	struct sieve_script script;
+
+	struct istream *data;
+};
+
+struct sieve_script *sieve_data_script_create_from_input
+	(struct sieve_instance *svinst, const char *name,
+		struct istream *input);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/storage/dict/Makefile.am b/pigeonhole/src/lib-sieve/storage/dict/Makefile.am
new file mode 100644
index 0000000..2a73f43
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/dict/Makefile.am
@@ -0,0 +1,13 @@
+noinst_LTLIBRARIES = libsieve_storage_dict.la
+
+AM_CPPFLAGS = \
+	$(LIBDOVECOT_INCLUDE) \
+	-I$(top_srcdir) \
+	-I$(top_srcdir)/src/lib-sieve
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+	fi
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+	     $$unique
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+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
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+distdir: $(BUILT_SOURCES)
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+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
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+	esac; \
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+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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+	fi
+mostlyclean-generic:
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+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
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+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/sieve-dict-script.Plo
+	-rm -f ./$(DEPDIR)/sieve-dict-storage.Plo
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+		-rm -f ./$(DEPDIR)/sieve-dict-script.Plo
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+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/storage/dict/sieve-dict-script.c b/pigeonhole/src/lib-sieve/storage/dict/sieve-dict-script.c
new file mode 100644
index 0000000..eb28f7d
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/dict/sieve-dict-script.c
@@ -0,0 +1,343 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "strfuncs.h"
+#include "istream.h"
+#include "dict.h"
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+#include "sieve-dump.h"
+#include "sieve-binary.h"
+
+#include "sieve-dict-storage.h"
+
+/*
+ * Script dict implementation
+ */
+
+static struct sieve_dict_script *sieve_dict_script_alloc(void)
+{
+	struct sieve_dict_script *dscript;
+	pool_t pool;
+
+	pool = pool_alloconly_create("sieve_dict_script", 1024);
+	dscript = p_new(pool, struct sieve_dict_script, 1);
+	dscript->script = sieve_dict_script;
+	dscript->script.pool = pool;
+
+	return dscript;
+}
+
+struct sieve_dict_script *sieve_dict_script_init
+(struct sieve_dict_storage *dstorage, const char *name)
+{
+	struct sieve_storage *storage = &dstorage->storage;
+	struct sieve_dict_script *dscript = NULL;
+	const char *location;
+
+	if ( name == NULL ) {
+		name = SIEVE_DICT_SCRIPT_DEFAULT;
+		location = storage->location;
+    } else {
+		location = t_strconcat
+			(storage->location, ";name=", name, NULL);
+    }
+
+	dscript = sieve_dict_script_alloc();
+	sieve_script_init(&dscript->script,
+		storage, &sieve_dict_script, location, name);
+
+	return dscript;
+}
+
+static void sieve_dict_script_destroy(struct sieve_script *script)
+{
+	struct sieve_dict_script *dscript =
+		(struct sieve_dict_script *)script;
+
+	if ( dscript->data_pool != NULL )
+		pool_unref(&dscript->data_pool);
+}
+
+static int sieve_dict_script_open
+(struct sieve_script *script, enum sieve_error *error_r)
+{
+	struct sieve_dict_script *dscript =
+		(struct sieve_dict_script *)script;
+	struct sieve_storage *storage = script->storage;
+	struct sieve_dict_storage *dstorage =
+		(struct sieve_dict_storage *)storage;
+	const char *name = script->name;
+	const char *path, *data_id, *error;
+	int ret;
+
+	if ( sieve_dict_storage_get_dict
+		(dstorage, &dscript->dict, error_r) < 0 )
+		return -1;
+
+	path = t_strconcat
+		(DICT_SIEVE_NAME_PATH, dict_escape_string(name), NULL);
+
+	struct dict_op_settings set = {
+		.username = dstorage->username,
+	};
+	ret = dict_lookup
+		(dscript->dict, &set, script->pool, path, &data_id, &error);
+	if ( ret <= 0 ) {
+		if ( ret < 0 ) {
+			sieve_script_set_critical(script,
+				"Failed to lookup script id from path %s: %s", path, error);
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+		} else {
+			e_debug(script->event,
+				"Script `%s' not found at path %s", name, path);
+			sieve_script_set_error(script,
+				SIEVE_ERROR_NOT_FOUND,
+				"Sieve script `%s' not found", name);
+			*error_r = SIEVE_ERROR_NOT_FOUND;
+		}
+		return -1;
+	}
+
+	dscript->data_id = p_strdup(script->pool, data_id);
+	return 0;
+}
+
+static int sieve_dict_script_get_stream
+(struct sieve_script *script, struct istream **stream_r,
+	enum sieve_error *error_r)
+{
+	struct sieve_dict_script *dscript =
+		(struct sieve_dict_script *)script;
+	struct sieve_dict_storage *dstorage =
+		(struct sieve_dict_storage *)script->storage;
+	const char *path, *name = script->name, *data, *error;
+	int ret;
+
+	dscript->data_pool =
+		pool_alloconly_create("sieve_dict_script data pool", 1024);
+
+	path = t_strconcat
+		(DICT_SIEVE_DATA_PATH, dict_escape_string(dscript->data_id), NULL);
+
+	struct dict_op_settings set = {
+		.username = dstorage->username,
+	};
+	ret = dict_lookup
+		(dscript->dict, &set, dscript->data_pool, path, &data, &error);
+	if ( ret <= 0 ) {
+		if ( ret < 0 ) {
+			sieve_script_set_critical(script,
+				"Failed to lookup data with id `%s' "
+				"for script `%s' from path %s: %s",
+				dscript->data_id, name, path, error);
+		} else {
+			sieve_script_set_critical(script,
+				"Data with id `%s' for script `%s' "
+				"not found at path %s",
+				dscript->data_id, name, path);
+		}
+		*error_r = SIEVE_ERROR_TEMP_FAILURE;
+		return -1;
+	}
+	
+	dscript->data = p_strdup(script->pool, data);
+	*stream_r = i_stream_create_from_data(dscript->data, strlen(dscript->data));
+	return 0;
+}
+
+static int sieve_dict_script_binary_read_metadata
+(struct sieve_script *script, struct sieve_binary_block *sblock,
+	sieve_size_t *offset)
+{
+	struct sieve_dict_script *dscript =
+		(struct sieve_dict_script *)script;
+	struct sieve_binary *sbin =
+		sieve_binary_block_get_binary(sblock);
+	string_t *data_id;
+
+	if ( dscript->data_id == NULL &&
+		sieve_script_open(script, NULL) < 0 )
+		return 0;
+
+	if ( !sieve_binary_read_string(sblock, offset, &data_id) ) {
+		e_error(script->event,
+			"Binary `%s' has invalid metadata for script `%s'",
+			sieve_binary_path(sbin), sieve_script_location(script));
+		return -1;
+	}
+	i_assert( dscript->data_id != NULL );
+	if ( strcmp(str_c(data_id), dscript->data_id) != 0 ) {
+		e_debug(script->event,
+			"Binary `%s' reports different data ID for script `%s' "
+			"(`%s' rather than `%s')",
+			sieve_binary_path(sbin), sieve_script_location(script),
+			str_c(data_id), dscript->data_id);
+		return 0;
+	}
+	return 1;
+}
+
+static void sieve_dict_script_binary_write_metadata
+(struct sieve_script *script, struct sieve_binary_block *sblock)
+{
+	struct sieve_dict_script *dscript =
+		(struct sieve_dict_script *)script;
+
+	sieve_binary_emit_cstring(sblock, dscript->data_id);
+}
+
+static bool sieve_dict_script_binary_dump_metadata
+(struct sieve_script *script ATTR_UNUSED, struct sieve_dumptime_env *denv,
+	struct sieve_binary_block *sblock, sieve_size_t *offset)
+{
+	string_t *data_id;
+
+	if ( !sieve_binary_read_string(sblock, offset, &data_id) )
+		return FALSE;
+	sieve_binary_dumpf(denv, "dict.data_id = %s\n", str_c(data_id));
+
+	return TRUE;
+}
+
+static const char * sieve_dict_script_get_binpath
+(struct sieve_dict_script *dscript)
+{
+	struct sieve_script *script = &dscript->script;
+	struct sieve_storage *storage = script->storage;
+
+	if ( dscript->binpath == NULL ) {
+		if ( storage->bin_dir == NULL )
+			return NULL;
+		dscript->binpath = p_strconcat(script->pool,
+			storage->bin_dir, "/",
+			sieve_binfile_from_name(script->name), NULL);
+	}
+
+	return dscript->binpath;
+}
+
+static struct sieve_binary *sieve_dict_script_binary_load
+(struct sieve_script *script, enum sieve_error *error_r)
+{
+	struct sieve_dict_script *dscript =
+		(struct sieve_dict_script *)script;
+
+	if ( sieve_dict_script_get_binpath(dscript) == NULL )
+		return NULL;
+
+	return sieve_binary_open(script->storage->svinst,
+		dscript->binpath, script, error_r);
+}
+
+static int sieve_dict_script_binary_save
+(struct sieve_script *script, struct sieve_binary *sbin, bool update,
+	enum sieve_error *error_r)
+{
+	struct sieve_dict_script *dscript =
+		(struct sieve_dict_script *)script;
+
+	if ( sieve_dict_script_get_binpath(dscript) == NULL )
+		return 0;
+	if ( sieve_storage_setup_bindir(script->storage, 0700) < 0 )
+		return -1;
+
+	return sieve_binary_save(sbin,
+		dscript->binpath, update, 0600, error_r);
+}
+
+static bool sieve_dict_script_equals
+(const struct sieve_script *script, const struct sieve_script *other)
+{
+	struct sieve_storage *storage = script->storage;
+	struct sieve_storage *sother = other->storage;
+
+	if ( strcmp(storage->location, sother->location) != 0 )
+		return FALSE;
+
+	i_assert( script->name != NULL && other->name != NULL );
+
+	return ( strcmp(script->name, other->name) == 0 );
+}
+
+const struct sieve_script sieve_dict_script = {
+	.driver_name = SIEVE_DICT_STORAGE_DRIVER_NAME,
+	.v = {
+		.destroy = sieve_dict_script_destroy,
+
+		.open = sieve_dict_script_open,
+
+		.get_stream = sieve_dict_script_get_stream,
+
+		.binary_read_metadata =sieve_dict_script_binary_read_metadata,
+		.binary_write_metadata = sieve_dict_script_binary_write_metadata,
+		.binary_dump_metadata = sieve_dict_script_binary_dump_metadata,
+		.binary_load = sieve_dict_script_binary_load,
+		.binary_save = sieve_dict_script_binary_save,
+
+		.equals = sieve_dict_script_equals
+	}
+};
+
+/*
+ * Script sequence
+ */
+
+struct sieve_dict_script_sequence {
+	struct sieve_script_sequence seq;
+
+	bool done:1;
+};
+
+struct sieve_script_sequence *sieve_dict_storage_get_script_sequence
+(struct sieve_storage *storage, enum sieve_error *error_r)
+{
+	struct sieve_dict_script_sequence *dseq = NULL;
+
+	if ( error_r != NULL )
+		*error_r = SIEVE_ERROR_NONE;
+
+	/* Create sequence object */
+	dseq = i_new(struct sieve_dict_script_sequence, 1);
+	sieve_script_sequence_init(&dseq->seq, storage);
+
+	return &dseq->seq;
+}
+
+struct sieve_script *sieve_dict_script_sequence_next
+(struct sieve_script_sequence *seq, enum sieve_error *error_r)
+{
+	struct sieve_dict_script_sequence *dseq =
+		(struct sieve_dict_script_sequence *)seq;
+	struct sieve_dict_storage *dstorage =
+		(struct sieve_dict_storage *)seq->storage;
+	struct sieve_dict_script *dscript;
+
+	if ( error_r != NULL )
+		*error_r = SIEVE_ERROR_NONE;
+
+	if ( dseq->done )
+		return NULL;
+	dseq->done = TRUE;
+
+	dscript = sieve_dict_script_init
+		(dstorage, seq->storage->script_name);
+	if ( sieve_script_open(&dscript->script, error_r) < 0 ) {
+		struct sieve_script *script = &dscript->script;
+		sieve_script_unref(&script);
+		return NULL;
+	}
+
+	return &dscript->script;
+}
+
+void sieve_dict_script_sequence_destroy(struct sieve_script_sequence *seq)
+{
+	struct sieve_dict_script_sequence *dseq =
+		(struct sieve_dict_script_sequence *)seq;
+	i_free(dseq);
+}
+
diff --git a/pigeonhole/src/lib-sieve/storage/dict/sieve-dict-storage.c b/pigeonhole/src/lib-sieve/storage/dict/sieve-dict-storage.c
new file mode 100644
index 0000000..7f50816
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/dict/sieve-dict-storage.c
@@ -0,0 +1,193 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "dict.h"
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+
+#include "sieve-dict-storage.h"
+
+/*
+ * Storage class
+ */
+
+static struct sieve_storage *sieve_dict_storage_alloc(void)
+{
+	struct sieve_dict_storage *dstorage;
+	pool_t pool;
+
+	pool = pool_alloconly_create("sieve_dict_storage", 1024);
+	dstorage = p_new(pool, struct sieve_dict_storage, 1);
+	dstorage->storage = sieve_dict_storage;
+	dstorage->storage.pool = pool;
+
+	return &dstorage->storage;
+}
+
+static int sieve_dict_storage_init
+(struct sieve_storage *storage, const char *const *options,
+	enum sieve_error *error_r)
+{
+	struct sieve_dict_storage *dstorage =
+		(struct sieve_dict_storage *)storage;
+	struct sieve_instance *svinst = storage->svinst;
+	const char *uri = storage->location, *username = NULL;
+
+	if ( options != NULL ) {
+		while ( *options != NULL ) {
+			const char *option = *options;
+
+			if ( strncasecmp(option, "user=", 5) == 0 && option[5] != '\0' ) {
+				username = option+5;
+			} else {
+				sieve_storage_set_critical(storage,
+					"Invalid option `%s'", option);
+				*error_r = SIEVE_ERROR_TEMP_FAILURE;
+				return -1;
+			}
+
+			options++;
+		}
+	}
+
+	if ( username == NULL ) {
+		if ( svinst->username == NULL ) {
+			sieve_storage_set_critical(storage,
+				"No username specified");
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+			return -1;
+		}
+		username = svinst->username;
+	}
+
+	if ( svinst->base_dir == NULL ) {
+		sieve_storage_set_critical(storage,
+			"BUG: Sieve interpreter is initialized without a base_dir");
+		*error_r = SIEVE_ERROR_TEMP_FAILURE;
+		return -1;
+	}
+
+	e_debug(storage->event, "user=%s, uri=%s", username, uri);
+
+	dstorage->uri = p_strdup(storage->pool, uri);
+	dstorage->username = p_strdup(storage->pool, username);
+
+	storage->location = p_strconcat(storage->pool,
+		SIEVE_DICT_STORAGE_DRIVER_NAME, ":", storage->location,
+		";user=", username, NULL);
+
+	return 0;
+}
+
+int sieve_dict_storage_get_dict
+(struct sieve_dict_storage *dstorage, struct dict **dict_r,
+	enum sieve_error *error_r)
+{
+	struct sieve_storage *storage = &dstorage->storage;
+	struct sieve_instance *svinst = storage->svinst;
+	struct dict_settings dict_set;
+	const char *error;
+	int ret;
+
+	if ( dstorage->dict == NULL ) {
+		i_zero(&dict_set);
+		dict_set.base_dir = svinst->base_dir;
+		ret = dict_init(dstorage->uri, &dict_set, &dstorage->dict, &error);
+		if ( ret < 0 ) {
+			sieve_storage_set_critical(storage,
+				"Failed to initialize dict with data `%s' for user `%s': %s",
+				dstorage->uri, dstorage->username, error);
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+			return -1;
+		}
+	}
+
+	*dict_r = dstorage->dict;
+	return 0;
+}
+
+static void sieve_dict_storage_destroy(struct sieve_storage *storage)
+{
+	struct sieve_dict_storage *dstorage =
+		(struct sieve_dict_storage *)storage;
+
+	if ( dstorage->dict != NULL )
+		dict_deinit(&dstorage->dict);
+}
+
+/*
+ * Script access
+ */
+
+static struct sieve_script *sieve_dict_storage_get_script
+(struct sieve_storage *storage, const char *name)
+{
+	struct sieve_dict_storage *dstorage =
+		(struct sieve_dict_storage *)storage;
+	struct sieve_dict_script *dscript;
+
+	T_BEGIN {
+		dscript = sieve_dict_script_init(dstorage, name);
+	} T_END;
+
+	return &dscript->script;
+}
+
+/*
+ * Active script
+ */
+
+struct sieve_script *sieve_dict_storage_active_script_open
+(struct sieve_storage *storage)
+{
+	struct sieve_dict_storage *dstorage =
+		(struct sieve_dict_storage *)storage;
+	struct sieve_dict_script *dscript;
+
+	dscript = sieve_dict_script_init
+		(dstorage, storage->script_name);
+	if ( sieve_script_open(&dscript->script, NULL) < 0 ) {
+		struct sieve_script *script = &dscript->script;
+		sieve_script_unref(&script);
+		return NULL;
+	}
+
+	return &dscript->script;
+}
+
+int sieve_dict_storage_active_script_get_name
+(struct sieve_storage *storage, const char **name_r)
+{
+	if ( storage->script_name != NULL )
+		*name_r = storage->script_name;
+	else
+		*name_r = SIEVE_DICT_SCRIPT_DEFAULT;
+	return 0;
+}
+
+/*
+ * Driver definition
+ */
+
+const struct sieve_storage sieve_dict_storage = {
+	.driver_name = SIEVE_DICT_STORAGE_DRIVER_NAME,
+	.version = 0,
+	.v = {
+		.alloc = sieve_dict_storage_alloc,
+		.destroy = sieve_dict_storage_destroy,
+		.init = sieve_dict_storage_init,
+
+		.get_script = sieve_dict_storage_get_script,
+
+		.get_script_sequence = sieve_dict_storage_get_script_sequence,
+		.script_sequence_next = sieve_dict_script_sequence_next,
+		.script_sequence_destroy = sieve_dict_script_sequence_destroy,
+
+		.active_script_get_name = sieve_dict_storage_active_script_get_name,
+		.active_script_open = sieve_dict_storage_active_script_open,
+
+		// FIXME: impement management interface
+	}
+};
diff --git a/pigeonhole/src/lib-sieve/storage/dict/sieve-dict-storage.h b/pigeonhole/src/lib-sieve/storage/dict/sieve-dict-storage.h
new file mode 100644
index 0000000..1f92221
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/dict/sieve-dict-storage.h
@@ -0,0 +1,66 @@
+#ifndef SIEVE_DICT_STORAGE_H
+#define SIEVE_DICT_STORAGE_H
+
+#include "sieve.h"
+#include "sieve-script-private.h"
+#include "sieve-storage-private.h"
+
+#define DICT_SIEVE_PATH DICT_PATH_PRIVATE"sieve/"
+#define DICT_SIEVE_NAME_PATH DICT_SIEVE_PATH"name/"
+#define DICT_SIEVE_DATA_PATH DICT_SIEVE_PATH"data/"
+
+#define SIEVE_DICT_SCRIPT_DEFAULT "default"
+
+/*
+ * Storage class
+ */
+
+struct sieve_dict_storage {
+	struct sieve_storage storage;
+
+	const char *username;
+	const char *uri;
+
+	struct dict *dict;
+};
+
+int sieve_dict_storage_get_dict
+	(struct sieve_dict_storage *dstorage, struct dict **dict_r,
+		enum sieve_error *error_r);
+
+struct sieve_script *sieve_dict_storage_active_script_open
+	(struct sieve_storage *storage);
+int sieve_dict_storage_active_script_get_name
+	(struct sieve_storage *storage, const char **name_r);
+
+/*
+ * Script class
+ */
+
+struct sieve_dict_script {
+	struct sieve_script script;
+
+	struct dict *dict;
+
+	pool_t data_pool;
+	const char *data_id;
+	const char *data;
+
+	const char *binpath;
+};
+
+struct sieve_dict_script *sieve_dict_script_init
+	(struct sieve_dict_storage *dstorage, const char *name);
+
+/*
+ * Script sequence
+ */
+
+struct sieve_script_sequence *sieve_dict_storage_get_script_sequence
+	(struct sieve_storage *storage, enum sieve_error *error_r);
+
+struct sieve_script *sieve_dict_script_sequence_next
+    (struct sieve_script_sequence *seq, enum sieve_error *error_r);
+void sieve_dict_script_sequence_destroy(struct sieve_script_sequence *seq);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/storage/file/Makefile.am b/pigeonhole/src/lib-sieve/storage/file/Makefile.am
new file mode 100644
index 0000000..b401fa8
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/file/Makefile.am
@@ -0,0 +1,19 @@
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+
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+
+libsieve_storage_file_la_SOURCES = \
+	sieve-file-script.c \
+	sieve-file-script-sequence.c \
+	sieve-file-storage-active.c \
+	sieve-file-storage-save.c \
+	sieve-file-storage-list.c \
+	sieve-file-storage-quota.c \
+	sieve-file-storage.c
+
+noinst_HEADERS = \
+	sieve-file-storage.h
diff --git a/pigeonhole/src/lib-sieve/storage/file/Makefile.in b/pigeonhole/src/lib-sieve/storage/file/Makefile.in
new file mode 100644
index 0000000..8432831
--- /dev/null
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+	sieve-file-storage-list.c \
+	sieve-file-storage-quota.c \
+	sieve-file-storage.c
+
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+	sieve-file-storage.h
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+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
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+	$(AM_V_CCLD)$(LINK)  $(libsieve_storage_file_la_OBJECTS) $(libsieve_storage_file_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
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+distclean-compile:
+	-rm -f *.tab.c
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+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/sieve-file-storage.Plo@am__quote@ # am--include-marker
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+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
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+	fi
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+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
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+		-rm -f ./$(DEPDIR)/sieve-file-script-sequence.Plo
+	-rm -f ./$(DEPDIR)/sieve-file-script.Plo
+	-rm -f ./$(DEPDIR)/sieve-file-storage-active.Plo
+	-rm -f ./$(DEPDIR)/sieve-file-storage-list.Plo
+	-rm -f ./$(DEPDIR)/sieve-file-storage-quota.Plo
+	-rm -f ./$(DEPDIR)/sieve-file-storage-save.Plo
+	-rm -f ./$(DEPDIR)/sieve-file-storage.Plo
+	-rm -f Makefile
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+	-rm -f ./$(DEPDIR)/sieve-file-storage-list.Plo
+	-rm -f ./$(DEPDIR)/sieve-file-storage-quota.Plo
+	-rm -f ./$(DEPDIR)/sieve-file-storage-save.Plo
+	-rm -f ./$(DEPDIR)/sieve-file-storage.Plo
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+	clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
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+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/storage/file/sieve-file-script-sequence.c b/pigeonhole/src/lib-sieve/storage/file/sieve-file-script-sequence.c
new file mode 100644
index 0000000..a1ae75d
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/file/sieve-file-script-sequence.c
@@ -0,0 +1,244 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "array.h"
+#include "eacces-error.h"
+
+#include "sieve-common.h"
+#include "sieve-script-private.h"
+
+#include "sieve-file-storage.h"
+
+#include <stdio.h>
+#include <dirent.h>
+
+/*
+ * Script sequence
+ */
+
+struct sieve_file_script_sequence {
+	struct sieve_script_sequence seq;
+	pool_t pool;
+
+	ARRAY_TYPE(const_string) script_files;
+	unsigned int index;
+
+	bool storage_is_file:1;
+};
+
+static int sieve_file_script_sequence_read_dir
+(struct sieve_file_script_sequence *fseq, const char *path)
+{
+	struct sieve_storage *storage = fseq->seq.storage;
+	DIR *dirp;
+	int ret = 0;
+
+	/* Open the directory */
+	if ( (dirp = opendir(path)) == NULL ) {
+		switch ( errno ) {
+		case ENOENT:
+			sieve_storage_set_error(storage,
+				SIEVE_ERROR_NOT_FOUND,
+				"Script sequence location not found");
+			break;
+		case EACCES:
+			sieve_storage_set_error(storage,
+				SIEVE_ERROR_NO_PERMISSION,
+				"Script sequence location not accessible");
+			e_error(storage->event,
+				"Failed to open sieve sequence: %s",
+				eacces_error_get("stat", path));
+			break;
+		default:
+			sieve_storage_set_critical(storage,
+				"Failed to open sieve sequence: "
+				"opendir(%s) failed: %m", path);
+			break;
+		}
+		return -1;
+	}
+
+	/* Read and sort script files */
+	for (;;) {
+		const char *const *files;
+		unsigned int count, i;
+		const char *file;
+		struct dirent *dp;
+		struct stat st;
+
+		errno = 0;
+		if ( (dp=readdir(dirp)) == NULL )
+			break;
+
+		if ( !sieve_script_file_has_extension(dp->d_name) )
+			continue;
+
+		file = NULL;
+		T_BEGIN {
+			if ( path[strlen(path)-1] == '/' )
+				file = t_strconcat(path, dp->d_name, NULL);
+			else
+				file = t_strconcat(path, "/", dp->d_name, NULL);
+
+			if ( stat(file, &st) == 0 && S_ISREG(st.st_mode) )
+				file = p_strdup(fseq->pool, dp->d_name);
+			else
+				file = NULL;
+		} T_END;
+
+		if (file == NULL)
+			continue;
+		
+		/* Insert into sorted array */
+		files = array_get(&fseq->script_files, &count);
+		for ( i = 0; i < count; i++ ) {
+			if ( strcmp(file, files[i]) < 0 )
+				break;
+		}
+
+		if ( i == count )
+			array_append(&fseq->script_files, &file, 1);
+		else
+			array_insert(&fseq->script_files, i, &file, 1);
+	} 
+
+	if ( errno != 0 ) {
+		sieve_storage_set_critical(storage,
+			"Failed to read sequence directory: "
+			"readdir(%s) failed: %m", path);
+		ret = -1;
+	}
+
+	/* Close the directory */
+	if ( dirp != NULL && closedir(dirp) < 0 ) {
+		e_error(storage->event,
+			"Failed to close sequence directory: "
+			"closedir(%s) failed: %m", path);
+	}
+	return ret;
+}
+
+struct sieve_script_sequence *sieve_file_storage_get_script_sequence
+(struct sieve_storage *storage, enum sieve_error *error_r)
+{
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)storage;
+	struct sieve_file_script_sequence *fseq = NULL;
+	const char *name = storage->script_name;
+	const char *file;
+	pool_t pool;
+	struct stat st;
+
+	/* Specified path can either be a regular file or a directory */
+	if ( stat(fstorage->path, &st) != 0 ) {
+		switch ( errno ) {
+		case ENOENT:
+			sieve_storage_set_error(storage,
+				SIEVE_ERROR_NOT_FOUND,
+				"Script sequence location not found");
+			break;
+		case EACCES:
+			sieve_storage_set_error(storage,
+				SIEVE_ERROR_NO_PERMISSION,
+				"Script sequence location not accessible");
+			e_error(storage->event,
+				"Failed to open sieve sequence: %s",
+				eacces_error_get("stat", fstorage->path));
+			break;
+		default:
+			sieve_storage_set_critical(storage,
+				"Failed to open sieve sequence: "
+				"stat(%s) failed: %m", fstorage->path);
+			break;
+		}
+		*error_r = storage->error_code;
+		return NULL;
+	}
+
+	/* Create sequence object */
+	pool = pool_alloconly_create("sieve_file_script_sequence", 1024);
+	fseq = p_new(pool, struct sieve_file_script_sequence, 1);
+	fseq->pool = pool;
+	sieve_script_sequence_init(&fseq->seq, storage);
+
+	if ( S_ISDIR(st.st_mode) ) {
+		i_array_init(&fseq->script_files, 16);
+
+		/* Path is directory */
+		if (name == 0 || *name == '\0') {
+			/* Read all '.sieve' files in directory */
+			if (sieve_file_script_sequence_read_dir
+				(fseq, fstorage->path) < 0) {
+				*error_r = storage->error_code;
+				sieve_file_script_sequence_destroy(&fseq->seq);
+				return NULL;
+			}
+
+		}	else {
+			/* Read specific script file */
+			file = sieve_script_file_from_name(name);
+			file = p_strdup(pool, file);
+			array_append(&fseq->script_files, &file, 1);
+		}
+
+	} else {
+		/* Path is a file
+		   (apparently; we'll see about that once it is opened) */
+		fseq->storage_is_file = TRUE;
+	}
+		
+	return &fseq->seq;
+}
+
+struct sieve_script *sieve_file_script_sequence_next
+(struct sieve_script_sequence *seq, enum sieve_error *error_r)
+{
+	struct sieve_file_script_sequence *fseq =
+		(struct sieve_file_script_sequence *)seq;
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)seq->storage;
+	struct sieve_file_script *fscript;
+	const char *const *files;
+	unsigned int count;
+
+	if ( error_r != NULL )
+		*error_r = SIEVE_ERROR_NONE;
+
+	fscript = NULL;
+	if ( fseq->storage_is_file ) {
+		if ( fseq->index++ < 1 )
+			fscript = sieve_file_script_open_from_name(fstorage, NULL);
+
+	} else {
+		files = array_get(&fseq->script_files, &count);
+
+		while ( fseq->index < count ) {
+			fscript = sieve_file_script_open_from_filename
+				(fstorage, files[fseq->index++], NULL);
+			if (fscript != NULL)
+				break;
+			if (seq->storage->error_code != SIEVE_ERROR_NOT_FOUND)
+				break;
+			sieve_storage_clear_error(seq->storage);
+		}
+	}
+
+	if (fscript == NULL ) {
+		if ( error_r != NULL ) 
+			*error_r = seq->storage->error_code;
+		return NULL;
+	}
+	return &fscript->script;
+}
+
+void sieve_file_script_sequence_destroy(struct sieve_script_sequence *seq)
+{
+	struct sieve_file_script_sequence *fseq =
+		(struct sieve_file_script_sequence *)seq;
+
+	if ( array_is_created(&fseq->script_files) )
+		array_free(&fseq->script_files);
+	pool_unref(&fseq->pool);
+}
diff --git a/pigeonhole/src/lib-sieve/storage/file/sieve-file-script.c b/pigeonhole/src/lib-sieve/storage/file/sieve-file-script.c
new file mode 100644
index 0000000..3c4ec60
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/file/sieve-file-script.c
@@ -0,0 +1,832 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "mempool.h"
+#include "path-util.h"
+#include "istream.h"
+#include "time-util.h"
+#include "eacces-error.h"
+
+#include "sieve-binary.h"
+#include "sieve-script-private.h"
+
+#include "sieve-file-storage.h"
+
+#include <stdio.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <time.h>
+#include <fcntl.h>
+
+/*
+ * Filename to name/name to filename
+ */
+
+const char *sieve_script_file_get_scriptname(const char *filename)
+{
+	const char *ext;
+
+	/* Extract the script name */
+	ext = strrchr(filename, '.');
+	if ( ext == NULL || ext == filename ||
+		strcmp(ext, "."SIEVE_SCRIPT_FILEEXT) != 0 )
+		return NULL;
+
+	return t_strdup_until(filename, ext);
+}
+
+bool sieve_script_file_has_extension(const char *filename)
+{
+	return ( sieve_script_file_get_scriptname(filename) != NULL );
+}
+
+const char *sieve_script_file_from_name(const char *name)
+{
+	return t_strconcat(name, "."SIEVE_SCRIPT_FILEEXT, NULL);
+}
+
+/*
+ * Common error handling
+ */
+
+static void sieve_file_script_handle_error
+(struct sieve_file_script *fscript, const char *op, const char *path,
+	const char *name, enum sieve_error *error_r)
+{
+	struct sieve_script *script = &fscript->script;
+	const char *abspath, *error;
+
+	switch ( errno ) {
+	case ENOENT:
+		if (t_abspath(path, &abspath, &error) < 0) {
+			sieve_script_set_error(script,
+				SIEVE_ERROR_TEMP_FAILURE,
+				"t_abspath(%s) failed: %s",
+				path, error);
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+			break;
+		}
+		e_debug(script->event, "File `%s' not found", abspath);
+		sieve_script_set_error(script,
+			SIEVE_ERROR_NOT_FOUND,
+			"Sieve script `%s' not found", name);
+		*error_r = SIEVE_ERROR_NOT_FOUND;
+		break;
+	case EACCES:
+		sieve_script_set_critical(script,
+			"Failed to %s sieve script: %s",
+			op, eacces_error_get(op, path));
+		*error_r = SIEVE_ERROR_NO_PERMISSION;
+		break;
+	default:
+		sieve_script_set_critical(script,
+			"Failed to %s sieve script: %s(%s) failed: %m",
+			op, op, path);
+		*error_r = SIEVE_ERROR_TEMP_FAILURE;
+		break;
+	}
+}
+
+/*
+ *
+ */
+
+static struct sieve_file_script *sieve_file_script_alloc(void)
+{
+	struct sieve_file_script *fscript;
+	pool_t pool;
+
+	pool = pool_alloconly_create("sieve_file_script", 2048);
+	fscript = p_new(pool, struct sieve_file_script, 1);
+	fscript->script = sieve_file_script;
+	fscript->script.pool = pool;
+
+	return fscript;
+}
+
+struct sieve_file_script *sieve_file_script_init_from_filename
+(struct sieve_file_storage *fstorage, const char *filename,
+	const char *scriptname)
+{
+	struct sieve_storage *storage = &fstorage->storage;
+	struct sieve_file_script *fscript = NULL;
+
+	/* Prevent initializing the active script link as a script when it
+	 * resides in the sieve storage directory.
+	 */
+	if ( scriptname != NULL && fstorage->link_path != NULL &&
+		*(fstorage->link_path) == '\0' ) {
+		if ( strcmp(filename, fstorage->active_fname) == 0 ) {
+			sieve_storage_set_error(storage,
+				SIEVE_ERROR_NOT_FOUND,
+				"Script `%s' does not exist.", scriptname);
+			return NULL;
+		}
+	}
+
+	fscript = sieve_file_script_alloc();
+	sieve_script_init
+		(&fscript->script, storage, &sieve_file_script,
+			sieve_file_storage_path_extend(fstorage, filename), scriptname);
+	fscript->filename = p_strdup(fscript->script.pool, filename);
+	return fscript;
+}
+
+struct sieve_file_script *sieve_file_script_open_from_filename
+(struct sieve_file_storage *fstorage, const char *filename,
+	const char *scriptname)
+{
+	struct sieve_file_script *fscript;
+	enum sieve_error error;
+
+	fscript = sieve_file_script_init_from_filename
+		(fstorage, filename, scriptname);
+	if ( fscript == NULL )
+		return NULL;
+
+	if ( sieve_script_open(&fscript->script, &error) < 0 ) {
+		struct sieve_script *script = &fscript->script;
+		sieve_script_unref(&script);
+		return NULL;
+	}
+
+	return fscript;
+}
+
+struct sieve_file_script *sieve_file_script_init_from_name
+(struct sieve_file_storage *fstorage, const char *name)
+{
+	struct sieve_storage *storage = &fstorage->storage;
+	struct sieve_file_script *fscript;
+
+	if (name != NULL && S_ISDIR(fstorage->st.st_mode)) {
+		return sieve_file_script_init_from_filename
+			(fstorage, sieve_script_file_from_name(name), name);
+	}
+
+	fscript = sieve_file_script_alloc();
+	sieve_script_init
+		(&fscript->script, storage, &sieve_file_script,
+			fstorage->active_path, name);
+	return fscript;
+}
+
+struct sieve_file_script *sieve_file_script_open_from_name
+(struct sieve_file_storage *fstorage, const char *name)
+{
+	struct sieve_file_script *fscript;
+	enum sieve_error error;
+
+	fscript = sieve_file_script_init_from_name(fstorage, name);
+	if ( fscript == NULL )
+		return NULL;
+
+	if ( sieve_script_open(&fscript->script, &error) < 0 ) {
+		struct sieve_script *script = &fscript->script;
+		sieve_script_unref(&script);
+		return NULL;
+	}
+
+	return fscript;
+}
+
+struct sieve_file_script *sieve_file_script_init_from_path
+(struct sieve_file_storage *fstorage, const char *path,
+	const char *scriptname, enum sieve_error *error_r)
+{
+	struct sieve_instance *svinst = fstorage->storage.svinst;
+	struct sieve_file_storage *fsubstorage;
+	struct sieve_file_script *fscript;
+	struct sieve_storage *substorage;
+	enum sieve_error error;
+
+	if ( error_r != NULL )
+		*error_r = SIEVE_ERROR_NONE;
+	else
+		error_r = &error;
+
+	fsubstorage = sieve_file_storage_init_from_path
+		(svinst, path, 0, error_r);
+	if (fsubstorage == NULL)
+		return NULL;
+	substorage = &fsubstorage->storage;
+
+	fscript = sieve_file_script_alloc();
+	sieve_script_init(&fscript->script,
+		substorage, &sieve_file_script, path, scriptname);
+	sieve_storage_unref(&substorage);
+
+	return fscript;
+}
+
+struct sieve_file_script *sieve_file_script_open_from_path
+(struct sieve_file_storage *fstorage, const char *path,
+	const char *scriptname, enum sieve_error *error_r)
+{
+	struct sieve_storage *storage = &fstorage->storage;
+	struct sieve_file_script *fscript;
+	enum sieve_error error;
+
+	if ( error_r != NULL )
+		*error_r = SIEVE_ERROR_NONE;
+	else
+		error_r = &error;
+
+	fscript = sieve_file_script_init_from_path
+		(fstorage, path, scriptname, error_r);
+	if (fscript == NULL) {
+		sieve_storage_set_error(storage,
+			*error_r, "Failed to open script");
+		return NULL;
+	}
+
+	if ( sieve_script_open(&fscript->script, error_r) < 0 ) {
+		struct sieve_script *script = &fscript->script;
+		const char *errormsg;
+
+		errormsg = sieve_script_get_last_error(&fscript->script, error_r);
+		sieve_storage_set_error(storage,
+			*error_r, "%s", errormsg);
+		sieve_script_unref(&script);
+		return NULL;
+	}
+
+	return fscript;
+}
+
+/*
+ * Open
+ */
+
+static int sieve_file_script_stat
+(const char *path, struct stat *st, struct stat *lnk_st)
+{
+	if ( lstat(path, st) < 0 )
+		return -1;
+
+	*lnk_st = *st;
+
+	if ( S_ISLNK(st->st_mode) && stat(path, st) < 0 )
+		return -1;
+
+	return 0;
+}
+
+static const char *
+path_split_filename(const char *path, const char **dirpath_r)
+{
+	const char *filename;
+
+	filename = strrchr(path, '/');
+	if ( filename == NULL ) {
+		*dirpath_r = "";
+		filename = path;
+	} else {
+		*dirpath_r = t_strdup_until(path, filename);
+		filename++;
+	}
+	return filename;
+}
+
+static int sieve_file_script_open
+(struct sieve_script *script, enum sieve_error *error_r)
+{
+	struct sieve_file_script *fscript =
+		(struct sieve_file_script *)script;
+	struct sieve_storage *storage = script->storage;
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)storage;
+	pool_t pool = script->pool;
+	const char *filename, *name, *path;
+	const char *dirpath, *basename, *binpath, *binprefix;
+	struct stat st, lnk_st;
+	bool success = TRUE;
+	int ret = 0;
+
+	filename = fscript->filename;
+	basename = NULL;
+	name = script->name;
+	st = fstorage->st;
+	lnk_st = fstorage->lnk_st;
+
+	if (name == NULL)
+		name = storage->script_name;
+
+	T_BEGIN {
+		if ( S_ISDIR(st.st_mode) ) {
+			/* Storage is a directory */
+			path = fstorage->path;
+
+			if ( (filename == NULL || *filename == '\0') &&
+				name != NULL && *name != '\0' ) {
+				/* Name is used to find actual filename */
+				filename = sieve_script_file_from_name(name);
+				basename = name;
+			}
+			if ( filename == NULL || *filename == '\0' ) {
+				sieve_script_set_critical(script,
+					"Sieve script file path '%s' is a directory.", path);
+				*error_r = SIEVE_ERROR_TEMP_FAILURE;
+				success = FALSE;
+			}	else {
+				/* Extend storage path with filename */
+				if (name == NULL) {
+					if ( basename == NULL &&
+						(basename=sieve_script_file_get_scriptname(filename)) == NULL )
+						basename = filename;
+					name = basename;
+				} else if (basename == NULL) {
+					basename = name;
+				}
+				dirpath = path;
+
+				path = sieve_file_storage_path_extend(fstorage, filename);
+				ret = sieve_file_script_stat(path, &st, &lnk_st);
+			}
+
+		} else {
+			/* Storage is a single file */
+			path = fstorage->active_path;
+
+			/* Extract filename from path */
+			filename = path_split_filename(path, &dirpath);
+
+			if ( (basename=sieve_script_file_get_scriptname(filename)) == NULL )
+				basename = filename;
+
+			if ( name == NULL )
+				name = basename;
+		}
+
+		if ( success ) {
+			if ( ret < 0 ) {
+				/* Make sure we have a script name for the error */
+				if ( name == NULL ) {
+					i_assert( basename != NULL );
+					name = basename;
+				}
+				sieve_file_script_handle_error
+					(fscript, "stat", path, name, error_r);
+				success = FALSE;
+
+			} else if ( !S_ISREG(st.st_mode) ) {
+				sieve_script_set_critical(script,
+					"Sieve script file '%s' is not a regular file.", path);
+				*error_r = SIEVE_ERROR_TEMP_FAILURE;
+				success = FALSE;
+			}
+		}
+
+		if ( success ) {
+			const char *bpath, *bfile, *bprefix;
+
+			if ( storage->bin_dir != NULL ) {
+				bpath = storage->bin_dir;
+				bfile = sieve_binfile_from_name(name);
+				bprefix = name;
+
+			} else {
+				bpath = dirpath;
+				bfile = sieve_binfile_from_name(basename);
+				bprefix = basename;
+			}
+
+			if ( *bpath == '\0' ) {
+				binpath = bfile;
+				binprefix = bprefix;
+			} else 	if ( bpath[strlen(bpath)-1] == '/' ) {
+				binpath = t_strconcat(bpath, bfile, NULL);
+				binprefix = t_strconcat(bpath, bprefix, NULL);
+			} else {
+				binpath = t_strconcat(bpath, "/", bfile, NULL);
+				binprefix = t_strconcat(bpath, "/", bprefix, NULL);
+			}
+
+			fscript->st = st;
+			fscript->lnk_st = lnk_st;
+			fscript->path = p_strdup(pool, path);
+			fscript->filename = p_strdup(pool, filename);
+			fscript->dirpath = p_strdup(pool, dirpath);
+			fscript->binpath = p_strdup(pool, binpath);
+			fscript->binprefix = p_strdup(pool, binprefix);
+
+			fscript->script.location = fscript->path;
+
+			if ( fscript->script.name == NULL )
+				fscript->script.name = p_strdup(pool, basename);
+		}
+	} T_END;
+
+	return ( success ? 0 : -1 );
+}
+
+static int sieve_file_script_get_stream
+(struct sieve_script *script, struct istream **stream_r,
+	enum sieve_error *error_r)
+{
+	struct sieve_file_script *fscript = (struct sieve_file_script *)script;
+	struct stat st;
+	struct istream *result;
+	int fd;
+
+	if ( (fd=open(fscript->path, O_RDONLY)) < 0 ) {
+		sieve_file_script_handle_error
+			(fscript, "open", fscript->path, fscript->script.name, error_r);
+		return -1;
+	}
+
+	if ( fstat(fd, &st) != 0 ) {
+		sieve_script_set_critical(script,
+			"Failed to open sieve script: fstat(fd=%s) failed: %m",
+			fscript->path);
+		*error_r = SIEVE_ERROR_TEMP_FAILURE;
+		result = NULL;
+	} else {
+		/* Re-check the file type just to be sure */
+		if ( !S_ISREG(st.st_mode) ) {
+			sieve_script_set_critical(script,
+				"Sieve script file `%s' is not a regular file", fscript->path);
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+			result = NULL;
+		} else {
+			result = i_stream_create_fd_autoclose(&fd, SIEVE_FILE_READ_BLOCK_SIZE);
+			fscript->st = fscript->lnk_st = st;
+		}
+	}
+
+	if ( result == NULL ) {
+		/* Something went wrong, close the fd */
+		if ( fd >= 0 && close(fd) != 0 ) {
+			e_error(script->event,
+				"Failed to close sieve script: "
+				"close(fd=%s) failed: %m", fscript->path);
+		}
+		return -1;
+	}
+
+	*stream_r = result;
+	return 0;
+}
+
+/*
+ * Binary
+ */
+
+static int sieve_file_script_binary_read_metadata
+(struct sieve_script *script, struct sieve_binary_block *sblock,
+	sieve_size_t *offset ATTR_UNUSED)
+{
+	struct sieve_file_script *fscript = (struct sieve_file_script *)script;
+	struct sieve_instance *svinst = script->storage->svinst;
+	struct sieve_binary *sbin = sieve_binary_block_get_binary(sblock);
+	const struct stat *sstat, *bstat;
+
+	bstat = sieve_binary_stat(sbin);
+	if ( fscript->st.st_mtime > fscript->lnk_st.st_mtime ||
+		(fscript->st.st_mtime == fscript->lnk_st.st_mtime &&
+		 ST_MTIME_NSEC(fscript->st) >= ST_MTIME_NSEC(fscript->lnk_st)) ) {
+		sstat = &fscript->st;
+	} else {
+		sstat = &fscript->lnk_st;
+	}
+
+	if ( bstat->st_mtime < sstat->st_mtime ||
+		(bstat->st_mtime == sstat->st_mtime &&
+			ST_MTIME_NSEC(*bstat) <= ST_MTIME_NSEC(*sstat)) ) {
+		if ( svinst->debug ) {
+			e_debug(script->event,
+				"Sieve binary `%s' is not newer "
+				"than the Sieve script `%s' (%s.%lu <= %s.%lu)",
+				sieve_binary_path(sbin), sieve_script_location(script),
+				t_strflocaltime("%Y-%m-%d %H:%M:%S", bstat->st_mtime),
+				ST_MTIME_NSEC(*bstat),
+				t_strflocaltime("%Y-%m-%d %H:%M:%S", sstat->st_mtime),
+				ST_MTIME_NSEC(*sstat));
+		}
+		return 0;
+	}
+
+	return 1;
+}
+
+static struct sieve_binary *sieve_file_script_binary_load
+(struct sieve_script *script, enum sieve_error *error_r)
+{
+	struct sieve_file_script *fscript = (struct sieve_file_script *)script;
+	struct sieve_instance *svinst = script->storage->svinst;
+
+	return sieve_binary_open(svinst, fscript->binpath, script, error_r);
+}
+
+static int sieve_file_script_binary_save
+(struct sieve_script *script, struct sieve_binary *sbin, bool update,
+	enum sieve_error *error_r)
+{
+	struct sieve_storage *storage = script->storage;
+	struct sieve_file_script *fscript = (struct sieve_file_script *)script;
+
+	if ( storage->bin_dir != NULL &&
+		sieve_storage_setup_bindir(storage, 0700) < 0 )
+		return -1;
+
+	return sieve_binary_save(sbin, fscript->binpath, update,
+		fscript->st.st_mode & (S_IRWXU | S_IRWXG | S_IRWXO), error_r);
+}
+
+static const char *sieve_file_script_binary_get_prefix
+(struct sieve_script *script)
+{
+	struct sieve_file_script *fscript = (struct sieve_file_script *)script;
+	
+	return fscript->binprefix;
+}
+
+/*
+ * Management
+ */
+
+static int sieve_file_storage_script_is_active(struct sieve_script *script)
+{
+	struct sieve_file_script *fscript =
+		(struct sieve_file_script *) script;
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)script->storage;
+	const char *afile;
+	int ret = 0;
+
+	T_BEGIN {
+		ret = sieve_file_storage_active_script_get_file(fstorage, &afile);
+
+		if ( ret > 0 ) {
+		 	/* Is the requested script active? */
+			ret = ( strcmp(fscript->filename, afile) == 0 ? 1 : 0 );
+		}
+	} T_END;
+
+	return ret;
+}
+
+static int sieve_file_storage_script_delete(struct sieve_script *script)
+{
+	struct sieve_file_script *fscript =
+		(struct sieve_file_script *)script;
+	int ret = 0;
+
+	if ( sieve_file_storage_pre_modify(script->storage) < 0 )
+		return -1;
+
+	ret = unlink(fscript->path);
+	if ( ret < 0 ) {
+		if ( errno == ENOENT ) {
+			sieve_script_set_error(script,
+				SIEVE_ERROR_NOT_FOUND,
+				"Sieve script does not exist.");
+		} else {
+			sieve_script_set_critical(script,
+				"Performing unlink() failed on sieve file `%s': %m",
+				fscript->path);
+		}
+	}
+	return ret;
+}
+
+static int _sieve_file_storage_script_activate
+(struct sieve_file_script *fscript)
+{
+	struct sieve_script *script = &fscript->script;
+	struct sieve_storage *storage = script->storage;
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)storage;
+	struct stat st;
+	const char *link_path, *afile;
+	int activated = 0;
+	int ret;
+
+	/* Find out whether there is an active script, but recreate
+	 * the symlink either way. This way, any possible error in the symlink
+	 * resolves automatically. This step is only necessary to provide a
+	 * proper return value indicating whether the script was already active.
+	 */
+	ret = sieve_file_storage_active_script_get_file(fstorage, &afile);
+
+	/* Is the requested script already active? */
+	if ( ret <= 0 || strcmp(fscript->filename, afile) != 0 )
+		activated = 1;
+
+	i_assert( fstorage->link_path != NULL );
+
+	/* Check the scriptfile we are trying to activate */
+	if ( lstat(fscript->path, &st) != 0 ) {
+		sieve_script_set_critical(script,
+		  "Failed to activate Sieve script: lstat(%s) failed: %m.",
+			fscript->path);
+		return -1;
+	}
+
+	/* Rescue a possible .dovecot.sieve regular file remaining from old
+	 * installations.
+	 */
+	if ( !sieve_file_storage_active_rescue_regular(fstorage) ) {
+		/* Rescue failed, manual intervention is necessary */
+		return -1;
+	}
+
+	/* Just try to create the symlink first */
+	link_path = t_strconcat
+	  ( fstorage->link_path, fscript->filename, NULL );
+
+ 	ret = symlink(link_path, fstorage->active_path);
+	if ( ret < 0 ) {
+		if ( errno == EEXIST ) {
+			ret = sieve_file_storage_active_replace_link(fstorage, link_path);
+			if ( ret < 0 ) {
+				return ret;
+			}
+		} else {
+			/* Other error, critical */
+			sieve_script_set_critical(script,
+				"Failed to activate Sieve script: "
+				"symlink(%s, %s) failed: %m",
+					link_path, fstorage->active_path);
+			return -1;
+		}
+	}
+	return activated;
+}
+
+static int sieve_file_storage_script_activate
+(struct sieve_script *script)
+{
+	struct sieve_file_script *fscript =
+		(struct sieve_file_script *)script;
+	int ret;
+
+	if ( sieve_file_storage_pre_modify(script->storage) < 0 )
+		return -1;
+
+	T_BEGIN {
+		ret = _sieve_file_storage_script_activate(fscript);
+	} T_END;
+
+	return ret;
+}
+
+static int sieve_file_storage_script_rename
+(struct sieve_script *script, const char *newname)
+{
+	struct sieve_file_script *fscript =
+		(struct sieve_file_script *)script;
+	struct sieve_storage *storage = script->storage;
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)storage;
+	const char *newpath, *newfile, *link_path;
+	int ret = 0;
+
+	if ( sieve_file_storage_pre_modify(storage) < 0 )
+		return -1;
+
+	T_BEGIN {
+		newfile = sieve_script_file_from_name(newname);
+		newpath = t_strconcat( fstorage->path, "/", newfile, NULL );
+
+		/* The normal rename() system call overwrites the existing file without
+		 * notice. Also, active scripts must not be disrupted by renaming a script.
+		 * That is why we use a link(newpath) [activate newpath] unlink(oldpath)
+		 */
+
+		/* Link to the new path */
+		ret = link(fscript->path, newpath);
+		if ( ret >= 0 ) {
+			/* Is the requested script active? */
+			if ( sieve_script_is_active(script) > 0 ) {
+				/* Active; make active link point to the new copy */
+				i_assert( fstorage->link_path != NULL );
+				link_path = t_strconcat
+					( fstorage->link_path, newfile, NULL );
+
+				ret = sieve_file_storage_active_replace_link(fstorage, link_path);
+			}
+
+			if ( ret >= 0 ) {
+				/* If all is good, remove the old link */
+				if ( unlink(fscript->path) < 0 ) {
+					e_error(script->event,
+						"Failed to clean up after rename: "
+						"unlink(%s) failed: %m", fscript->path);
+				}
+
+				if ( script->name != NULL && *script->name != '\0' )
+					script->name = p_strdup(script->pool, newname);
+				fscript->path = p_strdup(script->pool, newpath);
+				fscript->filename = p_strdup(script->pool, newfile);
+			} else {
+				/* If something went wrong, remove the new link to restore previous
+				 * state
+				 */
+				if ( unlink(newpath) < 0 ) {
+					e_error(script->event,
+						"Failed to clean up after failed rename: "
+						"unlink(%s) failed: %m", newpath);
+				}
+			}
+		} else {
+			/* Our efforts failed right away */
+			switch ( errno ) {
+			case ENOENT:
+				sieve_script_set_error(script, SIEVE_ERROR_NOT_FOUND,
+					"Sieve script does not exist.");
+				break;
+			case EEXIST:
+				sieve_script_set_error(script, SIEVE_ERROR_EXISTS,
+					"A sieve script with that name already exists.");
+				break;
+			default:
+				sieve_script_set_critical(script,
+					"Failed to rename Sieve script: "
+					"link(%s, %s) failed: %m", fscript->path, newpath);
+			}
+		}
+	} T_END;
+
+	return ret;
+}
+
+/*
+ * Properties
+ */
+
+static int sieve_file_script_get_size
+(const struct sieve_script *script, uoff_t *size_r)
+{
+	struct sieve_file_script *fscript = (struct sieve_file_script *)script;
+
+	*size_r = fscript->st.st_size;
+	return 1;
+}
+
+const char *sieve_file_script_get_dirpath
+(const struct sieve_script *script)
+{
+	struct sieve_file_script *fscript = (struct sieve_file_script *)script;
+
+	if ( script->driver_name != sieve_file_script.driver_name )
+		return NULL;
+
+	return fscript->dirpath;
+}
+
+const char *sieve_file_script_get_path
+(const struct sieve_script *script)
+{
+	struct sieve_file_script *fscript = (struct sieve_file_script *)script;
+
+	if ( script->driver_name != sieve_file_script.driver_name )
+		return NULL;
+
+	return fscript->path;
+}
+
+/*
+ * Matching
+ */
+
+static bool sieve_file_script_equals
+(const struct sieve_script *script, const struct sieve_script *other)
+{
+	struct sieve_file_script *fscript =
+		(struct sieve_file_script *)script;
+	struct sieve_file_script *fother =
+		(struct sieve_file_script *)other;
+
+	return ( CMP_DEV_T(fscript->st.st_dev, fother->st.st_dev) &&
+		fscript->st.st_ino == fother->st.st_ino );
+}
+
+/*
+ * Driver definition
+ */
+
+const struct sieve_script sieve_file_script = {
+	.driver_name = SIEVE_FILE_STORAGE_DRIVER_NAME,
+	.v = {
+		.open = sieve_file_script_open,
+
+		.get_stream = sieve_file_script_get_stream,
+
+		.binary_read_metadata = sieve_file_script_binary_read_metadata,
+		.binary_load = sieve_file_script_binary_load,
+		.binary_save = sieve_file_script_binary_save,
+		.binary_get_prefix = sieve_file_script_binary_get_prefix,
+
+		.rename = sieve_file_storage_script_rename,
+		.delete = sieve_file_storage_script_delete,
+		.is_active = sieve_file_storage_script_is_active,
+		.activate = sieve_file_storage_script_activate,
+
+		.get_size = sieve_file_script_get_size,
+
+		.equals = sieve_file_script_equals
+	}
+};
+
diff --git a/pigeonhole/src/lib-sieve/storage/file/sieve-file-storage-active.c b/pigeonhole/src/lib-sieve/storage/file/sieve-file-storage-active.c
new file mode 100644
index 0000000..28bc9eb
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/file/sieve-file-storage-active.c
@@ -0,0 +1,403 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "path-util.h"
+#include "ioloop.h"
+#include "hostpid.h"
+#include "file-copy.h"
+#include "time-util.h"
+
+#include "sieve-file-storage.h"
+
+#include <unistd.h>
+
+/*
+ * Symlink manipulation
+ */
+
+static int sieve_file_storage_active_read_link
+(struct sieve_file_storage *fstorage, const char **link_r)
+{
+	struct sieve_storage *storage = &fstorage->storage;
+	const char *error = NULL;
+	int ret;
+
+	ret = t_readlink(fstorage->active_path, link_r, &error);
+
+	if ( ret < 0 ) {
+		*link_r = NULL;
+
+		if ( errno == EINVAL ) {
+			/* Our symlink is no symlink. Report 'no active script'.
+			 * Activating a script will automatically resolve this, so
+			 * there is no need to panic on this one.
+			 */
+			if ( (storage->flags & SIEVE_STORAGE_FLAG_READWRITE) != 0 &&
+				(storage->flags & SIEVE_STORAGE_FLAG_SYNCHRONIZING) == 0 ) {
+				e_warning(storage->event,
+					  "Active sieve script symlink %s is no symlink.",
+					  fstorage->active_path);
+			}
+			return 0;
+		}
+
+		if ( errno == ENOENT ) {
+			/* Symlink not found */
+			return 0;
+		}
+
+		/* We do need to panic otherwise */
+		sieve_storage_set_critical(storage,
+			"Performing t_readlink() on active sieve symlink '%s' failed: %s",
+			fstorage->active_path, error);
+		return -1;
+	}
+
+	/* ret is now assured to be valid, i.e. > 0 */
+	return 1;
+}
+
+static const char *sieve_file_storage_active_parse_link
+(struct sieve_file_storage *fstorage, const char *link,
+	const char **scriptname_r)
+{
+	struct sieve_storage *storage = &fstorage->storage;
+	const char *fname, *scriptname, *scriptpath, *link_dir;
+
+	/* Split off directory from link path */
+	fname = strrchr(fstorage->active_path, '/');
+	if (fname == NULL)
+		link_dir = "";
+	else
+		link_dir = t_strdup_until(fstorage->active_path, fname+1);
+
+	/* Split link into path and filename */
+	fname = strrchr(link, '/');
+	if ( fname != NULL ) {
+		scriptpath = t_strdup_until(link, fname+1);
+		fname++;
+	} else {
+		scriptpath = "";
+		fname = link;
+	}
+
+	/* Check the script name */
+	scriptname = sieve_script_file_get_scriptname(fname);
+
+	/* Warn if link is deemed to be invalid */
+	if ( scriptname == NULL ) {
+		e_warning(storage->event,
+			  "Active Sieve script symlink %s is broken: "
+			  "Invalid scriptname (points to %s).",
+			  fstorage->active_path, link);
+		return NULL;
+	}
+
+	/* Check whether the path is any good */
+	const char *error = NULL;
+	if ( t_normpath_to(scriptpath, link_dir, &scriptpath, &error) < 0 ) {
+		e_warning(storage->event,
+			  "Failed to check active Sieve script symlink %s: "
+			  "Failed to normalize path (points to %s): %s",
+			  fstorage->active_path, scriptpath, error);
+		return NULL;
+	}
+	if ( strcmp(scriptpath, fstorage->path) != 0 ) {
+		e_warning(storage->event,
+			  "Active sieve script symlink %s is broken: "
+			  "Invalid/unknown path to storage (points to %s).",
+			  fstorage->active_path, scriptpath);
+		return NULL;
+	}
+
+	if ( scriptname_r != NULL )
+		*scriptname_r = scriptname;
+
+	return fname;
+}
+
+int sieve_file_storage_active_replace_link
+(struct sieve_file_storage *fstorage, const char *link_path)
+{
+	struct sieve_storage *storage = &fstorage->storage;
+	const char *active_path_new;
+	struct timeval *tv, tv_now;
+	int ret = 0;
+
+	tv = &ioloop_timeval;
+
+	for (;;) {
+		/* First the new symlink is created with a different filename */
+		active_path_new = t_strdup_printf
+			("%s-new.%s.P%sM%s.%s",
+				fstorage->active_path,
+				dec2str(tv->tv_sec), my_pid,
+				dec2str(tv->tv_usec), my_hostname);
+
+		ret = symlink(link_path, active_path_new);
+
+		if ( ret < 0 ) {
+			/* If link exists we try again later */
+			if ( errno == EEXIST ) {
+				/* Wait and try again - very unlikely */
+				sleep(2);
+				tv = &tv_now;
+				i_gettimeofday(&tv_now);
+				continue;
+			}
+
+			/* Other error, critical */
+			sieve_storage_set_critical(storage,
+				"Creating symlink() %s to %s failed: %m",
+				active_path_new, link_path);
+			return -1;
+		}
+
+		/* Link created */
+		break;
+	}
+
+	/* Replace the existing link. This activates the new script */
+	ret = rename(active_path_new, fstorage->active_path);
+
+	if ( ret < 0 ) {
+		/* Failed; created symlink must be deleted */
+		i_unlink(active_path_new);
+		sieve_storage_set_critical(storage,
+			"Performing rename() %s to %s failed: %m",
+			active_path_new, fstorage->active_path);
+		return -1;
+	}
+
+	return 1;
+}
+
+/*
+ * Active script properties
+ */
+
+int sieve_file_storage_active_script_get_file
+(struct sieve_file_storage *fstorage, const char **file_r)
+{
+	const char *link, *scriptfile;
+	int ret;
+
+	*file_r = NULL;
+
+	/* Read the active link */
+	if ( (ret=sieve_file_storage_active_read_link(fstorage, &link)) <= 0 )
+		return ret;
+
+	/* Parse the link */
+	scriptfile = sieve_file_storage_active_parse_link(fstorage, link, NULL);
+
+	if (scriptfile == NULL) {
+		/* Obviously, someone has been playing with our symlink:
+		 * ignore this situation and report 'no active script'.
+		 * Activation should fix this situation.
+		 */
+		return 0;
+	}
+
+	*file_r = scriptfile;
+	return 1;
+}
+
+int sieve_file_storage_active_script_get_name
+(struct sieve_storage *storage, const char **name_r)
+{
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)storage;
+	const char *link;
+	int ret;
+
+	*name_r = NULL;
+
+	/* Read the active link */
+	if ( (ret=sieve_file_storage_active_read_link
+		(fstorage, &link)) <= 0 )
+		return ret;
+
+	if ( sieve_file_storage_active_parse_link
+		(fstorage, link, name_r) == NULL ) {
+		/* Obviously, someone has been playing with our symlink:
+		 * ignore this situation and report 'no active script'.
+		 * Activation should fix this situation.
+		 */
+		return 0;
+	}
+
+	return 1;
+}
+
+/*
+ * Active script
+ */ 
+
+struct sieve_script *sieve_file_storage_active_script_open
+(struct sieve_storage *storage)
+{
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)storage;
+	struct sieve_file_script *fscript;
+	const char *scriptfile, *link;
+	int ret;
+
+	sieve_storage_clear_error(storage);
+
+	/* Read the active link */
+	if ( (ret=sieve_file_storage_active_read_link(fstorage, &link)) <= 0 ) {
+		if ( ret < 0 )
+			return NULL;
+
+		/* Try to open the active_path as a regular file */
+		if ( S_ISDIR(fstorage->st.st_mode) ) {
+			fscript = sieve_file_script_open_from_path(fstorage,
+				fstorage->active_path, NULL, NULL);			
+		} else {
+			fscript = sieve_file_script_open_from_name(fstorage, NULL);
+		}
+		if ( fscript == NULL ) {
+			if ( storage->error_code != SIEVE_ERROR_NOT_FOUND ) {
+				sieve_storage_set_critical(storage,
+					"Failed to open active path `%s' as regular file: %s",
+					fstorage->active_path, storage->error);
+			}
+			return NULL;
+		}
+
+		return &fscript->script;
+	} 
+
+	/* Parse the link */
+	scriptfile = sieve_file_storage_active_parse_link(fstorage, link, NULL);
+	if (scriptfile == NULL) {
+		/* Obviously someone has been playing with our symlink,
+		 * ignore this situation and report 'no active script'.
+		 * Activation should fix this situation.
+		 */
+		sieve_storage_set_error(storage, SIEVE_ERROR_NOT_FOUND,
+			"Active script is invalid");
+		return NULL;
+	}
+
+	fscript = sieve_file_script_open_from_path(fstorage,
+		fstorage->active_path,
+		sieve_script_file_get_scriptname(scriptfile),
+		NULL);
+	if ( fscript == NULL && storage->error_code == SIEVE_ERROR_NOT_FOUND ) {
+		e_warning(storage->event,
+			  "Active sieve script symlink %s points to non-existent script "
+			  "(points to %s).", fstorage->active_path, link);
+	}
+	return (fscript != NULL ? &fscript->script : NULL);
+}
+
+int sieve_file_storage_active_script_get_last_change
+(struct sieve_storage *storage, time_t *last_change_r)
+{
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)storage;
+	struct stat st;
+
+	/* Try direct lstat first */
+	if ( lstat(fstorage->active_path, &st) == 0 ) {
+		if ( !S_ISLNK(st.st_mode) ) {
+			*last_change_r = st.st_mtime;
+			return 0;
+		}
+	}
+	/* Check error */
+	else if ( errno != ENOENT ) {
+		sieve_storage_set_critical(storage,
+			"lstat(%s) failed: %m", fstorage->active_path);
+	}
+
+	/* Fall back to statting storage directory */
+	return sieve_storage_get_last_change(storage, last_change_r);
+}
+
+bool sieve_file_storage_active_rescue_regular
+(struct sieve_file_storage *fstorage)
+{
+	struct sieve_storage *storage = &fstorage->storage;
+	struct stat st;
+
+	/* Stat the file */
+	if ( lstat(fstorage->active_path, &st) != 0 ) {
+		if ( errno != ENOENT ) {
+			sieve_storage_set_critical(storage,
+				"Failed to stat active sieve script symlink (%s): %m.",
+				fstorage->active_path);
+			return FALSE;
+		}
+		return TRUE;
+	}
+
+	if ( S_ISLNK( st.st_mode ) ) {
+		e_debug(storage->event,
+			"Nothing to rescue %s.", fstorage->active_path);
+		return TRUE; /* Nothing to rescue */
+	}
+
+	/* Only regular files can be rescued */
+	if ( S_ISREG( st.st_mode ) ) {
+		const char *dstpath;
+		bool result = TRUE;
+
+ 		T_BEGIN {
+
+			dstpath = t_strconcat( fstorage->path, "/",
+				sieve_script_file_from_name("dovecot.orig"), NULL );
+			if ( file_copy(fstorage->active_path, dstpath, TRUE) < 1 ) {
+				sieve_storage_set_critical(storage,
+					"Active sieve script file '%s' is a regular file "
+					"and copying it to the script storage as '%s' failed. "
+					"This needs to be fixed manually.",
+					fstorage->active_path, dstpath);
+				result = FALSE;
+			} else {
+				e_info(storage->event,
+				       "Moved active sieve script file '%s' "
+				       "to script storage as '%s'.",
+				       fstorage->active_path, dstpath);
+			}
+		} T_END;
+
+		return result;
+	}
+
+	sieve_storage_set_critical(storage,
+		"Active sieve script file '%s' is no symlink nor a regular file. "
+		"This needs to be fixed manually.", fstorage->active_path);
+	return FALSE;
+}
+
+int sieve_file_storage_deactivate(struct sieve_storage *storage)
+{
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)storage;
+	int ret;
+
+	if ( sieve_file_storage_pre_modify(storage) < 0 )
+		return -1;
+
+	if ( !sieve_file_storage_active_rescue_regular(fstorage) )
+		return -1;
+
+	/* Delete the symlink, so no script is active */
+	ret = unlink(fstorage->active_path);
+
+	if ( ret < 0 ) {
+		if ( errno != ENOENT ) {
+			sieve_storage_set_critical(storage,
+				"Failed to deactivate Sieve: "
+				"unlink(%s) failed: %m", fstorage->active_path);
+			return -1;
+		} else {
+			return 0;
+		}
+	}
+	return 1;
+}
diff --git a/pigeonhole/src/lib-sieve/storage/file/sieve-file-storage-list.c b/pigeonhole/src/lib-sieve/storage/file/sieve-file-storage-list.c
new file mode 100644
index 0000000..75a34c9
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/file/sieve-file-storage-list.c
@@ -0,0 +1,140 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "eacces-error.h"
+
+#include "sieve-common.h"
+#include "sieve-script-private.h"
+
+#include "sieve-file-storage.h"
+
+#include <stdio.h>
+#include <dirent.h>
+
+struct sieve_file_list_context {
+	struct sieve_storage_list_context context;
+	pool_t pool;
+
+	const char *active;
+	const char *dir;
+	DIR *dirp;
+};
+
+struct sieve_storage_list_context *sieve_file_storage_list_init
+(struct sieve_storage *storage)
+{
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)storage;
+	struct sieve_file_list_context *flctx;
+	const char *active = NULL;
+	pool_t pool;
+	DIR *dirp;
+
+	/* Open the directory */
+	if ( (dirp = opendir(fstorage->path)) == NULL ) {
+		switch ( errno ) {
+		case ENOENT:
+			sieve_storage_set_error(storage,
+				SIEVE_ERROR_NOT_FOUND,
+				"Script storage not found");
+			break;
+		case EACCES:
+			sieve_storage_set_error(storage,
+				SIEVE_ERROR_NO_PERMISSION,
+				"Script storage not accessible");
+			e_error(storage->event, "Failed to list scripts: %s",
+				eacces_error_get("opendir", fstorage->path));
+			break;
+		default:
+			sieve_storage_set_critical(storage,
+				"Failed to list scripts: "
+				"opendir(%s) failed: %m", fstorage->path);
+			break;
+		}
+		return NULL;
+	}
+
+	T_BEGIN {
+		/* Get the name of the active script */
+		if ( sieve_file_storage_active_script_get_file(fstorage, &active) < 0) {
+			flctx = NULL;
+		} else {
+			pool = pool_alloconly_create("sieve_file_list_context", 1024);
+			flctx = p_new(pool, struct sieve_file_list_context, 1);
+			flctx->pool = pool;
+			flctx->dirp = dirp;
+			flctx->active = ( active != NULL ? p_strdup(pool, active) : NULL );
+		}
+	} T_END;
+
+	if ( flctx == NULL ) {
+		if ( closedir(dirp) < 0) {
+			e_error(storage->event,
+				"closedir(%s) failed: %m", fstorage->path);	
+		}
+		return NULL;
+	}
+	return &flctx->context;
+}
+
+const char *sieve_file_storage_list_next
+(struct sieve_storage_list_context *ctx, bool *active)
+{
+	struct sieve_file_list_context *flctx =
+		(struct sieve_file_list_context *)ctx;
+	const struct sieve_file_storage *fstorage =
+		(const struct sieve_file_storage *)ctx->storage;
+	struct dirent *dp;
+	const char *scriptname;
+
+	*active = FALSE;
+
+	for (;;) {
+		if ( (dp = readdir(flctx->dirp)) == NULL )
+			return NULL;
+
+		scriptname = sieve_script_file_get_scriptname(dp->d_name);
+		if (scriptname != NULL ) {
+			/* Don't list our active sieve script link if the link
+			 * resides in the script dir (generally a bad idea).
+			 */
+			i_assert( fstorage->link_path != NULL );
+			if ( *(fstorage->link_path) == '\0' &&
+				strcmp(fstorage->active_fname, dp->d_name) == 0 )
+				continue;
+
+			break;
+		}
+	}
+
+	if ( flctx->active != NULL && strcmp(dp->d_name, flctx->active) == 0 ) {
+		*active = TRUE;
+		flctx->active = NULL;
+	}
+
+	return scriptname;
+}
+
+int sieve_file_storage_list_deinit(struct sieve_storage_list_context *lctx)
+{
+	struct sieve_file_list_context *flctx =
+		(struct sieve_file_list_context *)lctx;
+	const struct sieve_file_storage *fstorage =
+		(const struct sieve_file_storage *)lctx->storage;
+
+	if (closedir(flctx->dirp) < 0) {
+		e_error(lctx->storage->event,
+			"closedir(%s) failed: %m", fstorage->path);
+	}
+
+	pool_unref(&flctx->pool);
+
+	// FIXME: return error here if something went wrong during listing
+	return 0;
+}
+
+
+
+
diff --git a/pigeonhole/src/lib-sieve/storage/file/sieve-file-storage-quota.c b/pigeonhole/src/lib-sieve/storage/file/sieve-file-storage-quota.c
new file mode 100644
index 0000000..65e075d
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/file/sieve-file-storage-quota.c
@@ -0,0 +1,120 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+
+#include "sieve.h"
+#include "sieve-script.h"
+
+#include "sieve-file-storage.h"
+
+#include <stdio.h>
+#include <dirent.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+int sieve_file_storage_quota_havespace
+(struct sieve_storage *storage, const char *scriptname, size_t size,
+	enum sieve_storage_quota *quota_r, uint64_t *limit_r)
+{
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)storage;
+	struct dirent *dp;
+	DIR *dirp;
+	uint64_t script_count = 1;
+	uint64_t script_storage = size;
+	int result = 1;
+
+	/* Open the directory */
+	if ( (dirp = opendir(fstorage->path)) == NULL ) {
+		sieve_storage_set_critical(storage,
+			"quota: opendir(%s) failed: %m", fstorage->path);
+		return -1;
+	}
+
+	/* Scan all files */
+	for (;;) {
+		const char *name;
+		bool replaced = FALSE;
+
+		/* Read next entry */
+		errno = 0;
+		if ( (dp = readdir(dirp)) == NULL ) {
+			if ( errno != 0 ) {
+				sieve_storage_set_critical(storage,
+					"quota: readdir(%s) failed: %m", fstorage->path);
+				result = -1;
+			}
+			break;
+		}
+
+		/* Parse filename */
+		name = sieve_script_file_get_scriptname(dp->d_name);
+
+		/* Ignore non-script files */
+		if ( name == NULL )
+			continue;
+
+		/* Don't list our active sieve script link if the link
+		 * resides in the script dir (generally a bad idea).
+		 */
+		i_assert( fstorage->link_path != NULL );
+		if ( *(fstorage->link_path) == '\0' &&
+			strcmp(fstorage->active_fname, dp->d_name) == 0 )
+			continue;
+
+		if ( strcmp(name, scriptname) == 0 )
+			replaced = TRUE;
+
+		/* Check count quota if necessary */
+		if ( storage->max_scripts > 0 ) {
+			if ( !replaced ) {
+				script_count++;
+
+				if ( script_count > storage->max_scripts ) {
+					*quota_r = SIEVE_STORAGE_QUOTA_MAXSCRIPTS;
+					*limit_r = storage->max_scripts;
+					result = 0;
+					break;
+				}
+			}
+		}
+
+		/* Check storage quota if necessary */
+		if ( storage->max_storage > 0 ) {
+			const char *path;
+			struct stat st;
+
+			path = t_strconcat(fstorage->path, "/", dp->d_name, NULL);
+
+			if ( stat(path, &st) < 0 ) {
+				e_warning(storage->event,
+					  "quota: stat(%s) failed: %m", path);
+				continue;
+			}
+
+			if ( !replaced ) {
+				script_storage += st.st_size;
+
+				if ( script_storage > storage->max_storage ) {
+					*quota_r = SIEVE_STORAGE_QUOTA_MAXSTORAGE;
+					*limit_r = storage->max_storage;
+					result = 0;
+					break;
+				}
+			}
+		}
+	}
+
+	/* Close directory */
+	if ( closedir(dirp) < 0 ) {
+		sieve_storage_set_critical(storage,
+			"quota: closedir(%s) failed: %m", fstorage->path);
+	}
+	return result;
+}
+
+
+
+
diff --git a/pigeonhole/src/lib-sieve/storage/file/sieve-file-storage-save.c b/pigeonhole/src/lib-sieve/storage/file/sieve-file-storage-save.c
new file mode 100644
index 0000000..bfbe380
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/file/sieve-file-storage-save.c
@@ -0,0 +1,544 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "hostpid.h"
+#include "ioloop.h"
+#include "array.h"
+#include "buffer.h"
+#include "istream.h"
+#include "ostream.h"
+#include "str.h"
+#include "eacces-error.h"
+#include "safe-mkstemp.h"
+
+#include "sieve-file-storage.h"
+
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <utime.h>
+
+struct sieve_file_save_context {
+	struct sieve_storage_save_context context;
+
+	pool_t pool;
+
+	struct ostream *output;
+	int fd;
+	const char *tmp_path;
+
+	time_t mtime;
+
+	bool failed:1;
+	bool finished:1;
+};
+
+static const char *sieve_generate_tmp_filename(const char *scriptname)
+{
+	static struct timeval last_tv = { 0, 0 };
+	struct timeval tv;
+
+	/* use secs + usecs to guarantee uniqueness within this process. */
+	if (ioloop_timeval.tv_sec > last_tv.tv_sec ||
+		(ioloop_timeval.tv_sec == last_tv.tv_sec &&
+		ioloop_timeval.tv_usec > last_tv.tv_usec)) {
+		tv = ioloop_timeval;
+	} else {
+		tv = last_tv;
+		if (++tv.tv_usec == 1000000) {
+			tv.tv_sec++;
+			tv.tv_usec = 0;
+		}
+	}
+	last_tv = tv;
+
+	if ( scriptname == NULL ) {
+		return t_strdup_printf("%s.M%sP%s.%s.tmp",
+			dec2str(tv.tv_sec), dec2str(tv.tv_usec),
+			my_pid, my_hostname);
+	}
+
+	scriptname = t_strdup_printf("%s_%s.M%sP%s.%s",
+		scriptname,	dec2str(tv.tv_sec), dec2str(tv.tv_usec),
+		my_pid, my_hostname);
+	return sieve_script_file_from_name(scriptname);
+}
+
+static int sieve_file_storage_create_tmp
+(struct sieve_file_storage *fstorage, const char *scriptname,
+	const char **fpath_r)
+{
+	struct sieve_storage *storage = &fstorage->storage;
+	struct stat st;
+	unsigned int prefix_len;
+	const char *tmp_fname = NULL;
+	string_t *path;
+	int fd;
+
+	path = t_str_new(256);
+	str_append(path, fstorage->path);
+	str_append(path, "/tmp/");
+	prefix_len = str_len(path);
+
+	for (;;) {
+		tmp_fname = sieve_generate_tmp_filename(scriptname);
+		str_truncate(path, prefix_len);
+		str_append(path, tmp_fname);
+
+		/* stat() first to see if it exists. pretty much the only
+		   possibility of that happening is if time had moved
+		   backwards, but even then it's highly unlikely. */
+		if (stat(str_c(path), &st) == 0) {
+			/* try another file name */
+		} else if (errno != ENOENT) {
+			switch ( errno ) {
+			case EACCES:
+				sieve_storage_set_critical(storage, "save: %s",
+					eacces_error_get("stat", fstorage->path));
+				break;
+			default:
+				sieve_storage_set_critical(storage, "save: "
+					"stat(%s) failed: %m", str_c(path));
+				break;
+			}
+			return -1;
+		} else {
+			/* doesn't exist */
+			mode_t old_mask = umask(0777 & ~(fstorage->file_create_mode));
+			fd = open(str_c(path),
+				O_WRONLY | O_CREAT | O_TRUNC | O_EXCL, 0777);
+			umask(old_mask);
+
+			if (fd != -1 || errno != EEXIST)
+				break;
+			/* race condition between stat() and open().
+				highly unlikely. */
+		}
+	}
+
+	*fpath_r = str_c(path);
+	if (fd == -1) {
+		if (ENOQUOTA(errno)) {
+			sieve_storage_set_error(storage,
+				SIEVE_ERROR_NO_QUOTA,
+				"Not enough disk quota");
+		} else {
+			switch ( errno ) {
+			case EACCES:
+				sieve_storage_set_critical(storage, "save: %s",
+					eacces_error_get("open", fstorage->path));
+				break;
+			default:
+				sieve_storage_set_critical(storage, "save: "
+					"open(%s) failed: %m", str_c(path));
+				break;
+			}
+		}
+	}
+
+	return fd;
+}
+
+static int sieve_file_storage_script_move
+(struct sieve_file_save_context *fsctx, const char *dst)
+{
+	struct sieve_storage_save_context *sctx = &fsctx->context;
+	struct sieve_storage *storage = sctx->storage;
+	int result = 0;
+
+	T_BEGIN {
+
+		/* Using rename() to ensure existing files are replaced
+		 * without conflicts with other processes using the same
+		 * file. The kernel wont fully delete the original until
+		 * all processes have closed the file.
+		 */
+		if (rename(fsctx->tmp_path, dst) == 0)
+			result = 0;
+		else {
+			result = -1;
+			if ( ENOQUOTA(errno) ) {
+				sieve_storage_set_error(storage,
+					SIEVE_ERROR_NO_QUOTA,
+					"Not enough disk quota");
+			} else if ( errno == EACCES ) {
+				sieve_storage_set_critical(storage, "save: "
+					"Failed to save Sieve script: "
+					"%s", eacces_error_get("rename", dst));
+			} else {
+				sieve_storage_set_critical(storage, "save: "
+					"rename(%s, %s) failed: %m", fsctx->tmp_path, dst);
+			}
+		}
+
+		/* Always destroy temp file */
+		if (unlink(fsctx->tmp_path) < 0 && errno != ENOENT) {
+			e_warning(storage->event, "save: "
+				  "unlink(%s) failed: %m", fsctx->tmp_path);
+		}
+	} T_END;
+
+	return result;
+}
+
+struct sieve_storage_save_context *
+sieve_file_storage_save_alloc(struct sieve_storage *storage)
+{
+	struct sieve_file_save_context *fsctx;
+	pool_t pool;
+
+	pool = pool_alloconly_create("sieve_file_save_context", 1024);
+	fsctx = p_new(pool, struct sieve_file_save_context, 1);
+	fsctx->context.pool = pool;
+	fsctx->context.storage = storage;
+
+	return &fsctx->context;
+}
+
+int sieve_file_storage_save_init(struct sieve_storage_save_context *sctx,
+				 const char *scriptname, struct istream *input)
+{
+	struct sieve_storage *storage = sctx->storage;
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)storage;
+	struct sieve_file_save_context *fsctx =
+		(struct sieve_file_save_context *)sctx;
+	pool_t pool = sctx->pool;
+	const char *path;
+	int fd, ret = 0;
+
+	if ( sieve_file_storage_pre_modify(storage) < 0 )
+		return -1;
+
+	if ( scriptname != NULL ) {
+		/* Prevent overwriting the active script link when it resides in the
+		 * sieve storage directory.
+		 */
+		i_assert( fstorage->link_path != NULL );
+		if ( *(fstorage->link_path) == '\0' ) {
+			const char *svext;
+			size_t namelen;
+
+			svext = strrchr(fstorage->active_fname, '.');
+			namelen = svext - fstorage->active_fname;
+			if ( svext != NULL && str_begins(svext+1, "sieve") &&
+			     strlen(scriptname) == namelen &&
+			     str_begins(fstorage->active_fname, scriptname) )
+			{
+				sieve_storage_set_error(storage,
+					SIEVE_ERROR_BAD_PARAMS,
+					"Script name `%s' is reserved for internal use.",
+					scriptname);
+				return -1;
+			}
+		}
+	}
+
+	T_BEGIN {
+		fd = sieve_file_storage_create_tmp(fstorage, scriptname, &path);
+		if (fd == -1) {
+			ret = -1;
+		} else {
+			fsctx->context.scriptname = p_strdup(pool, scriptname);
+			fsctx->context.input = input;
+			fsctx->fd = fd;
+			fsctx->output = o_stream_create_fd(fsctx->fd, 0);
+			fsctx->tmp_path = p_strdup(pool, path);
+		}
+	} T_END;
+
+	return ret;
+}
+
+int sieve_file_storage_save_continue
+(struct sieve_storage_save_context *sctx)
+{
+	struct sieve_file_save_context *fsctx =
+		(struct sieve_file_save_context *)sctx;
+
+	switch (o_stream_send_istream(fsctx->output, sctx->input)) {
+	case OSTREAM_SEND_ISTREAM_RESULT_FINISHED:
+	case OSTREAM_SEND_ISTREAM_RESULT_WAIT_INPUT:
+		return 0;
+	case OSTREAM_SEND_ISTREAM_RESULT_WAIT_OUTPUT:
+		i_unreached();
+	case OSTREAM_SEND_ISTREAM_RESULT_ERROR_INPUT:
+		sieve_storage_set_critical(sctx->storage,
+			"save: read(%s) failed: %s",
+			i_stream_get_name(sctx->input),
+			i_stream_get_error(sctx->input));
+		return -1;
+	case OSTREAM_SEND_ISTREAM_RESULT_ERROR_OUTPUT:
+		sieve_storage_set_critical(sctx->storage,
+			"save: write(%s) failed: %s", fsctx->tmp_path,
+			o_stream_get_error(fsctx->output));
+		return -1;
+	}
+	return 0;
+}
+
+int sieve_file_storage_save_finish
+(struct sieve_storage_save_context *sctx)
+{
+	struct sieve_file_save_context *fsctx =
+		(struct sieve_file_save_context *)sctx;
+	struct sieve_storage *storage = sctx->storage;
+	int output_errno;
+
+	if ( sctx->failed && fsctx->fd == -1 ) {
+		/* tmp file creation failed */
+		return -1;
+	}
+
+	T_BEGIN {
+		output_errno = fsctx->output->stream_errno;
+		o_stream_destroy(&fsctx->output);
+
+		if ( fsync(fsctx->fd) < 0 ) {
+			sieve_storage_set_critical(storage, "save: "
+				"fsync(%s) failed: %m", fsctx->tmp_path);
+			sctx->failed = TRUE;
+		}
+		if ( close(fsctx->fd) < 0 ) {
+			sieve_storage_set_critical(storage, "save: "
+				"close(%s) failed: %m", fsctx->tmp_path);
+			sctx->failed = TRUE;
+		}
+		fsctx->fd = -1;
+
+		if ( sctx->failed ) {
+			/* delete the tmp file */
+			if (unlink(fsctx->tmp_path) < 0 && errno != ENOENT) {
+				e_warning(storage->event, "save: "
+					  "unlink(%s) failed: %m",
+					  fsctx->tmp_path);
+			}
+
+			errno = output_errno;
+			if ( ENOQUOTA(errno) ) {
+				sieve_storage_set_error(storage,
+					SIEVE_ERROR_NO_QUOTA,
+					"Not enough disk quota");
+			} else if ( errno != 0 ) {
+				sieve_storage_set_critical(storage, "save: "
+					"write(%s) failed: %m", fsctx->tmp_path);
+			}
+			fsctx->tmp_path = NULL;
+		}
+	} T_END;
+
+	return ( sctx->failed ? -1 : 0 );
+}
+
+struct sieve_script *sieve_file_storage_save_get_tempscript
+(struct sieve_storage_save_context *sctx)
+{
+	struct sieve_file_save_context *fsctx =
+		(struct sieve_file_save_context *)sctx;
+	struct sieve_file_storage *fstorage = 
+		(struct sieve_file_storage *)sctx->storage;
+	struct sieve_file_script *tmpscript;
+	enum sieve_error error;
+	const char *scriptname;
+
+	if (sctx->failed)
+		return NULL;
+
+	if ( sctx->scriptobject != NULL )
+		return sctx->scriptobject;
+
+	scriptname =
+		( sctx->scriptname == NULL ? "" : sctx->scriptname );
+	tmpscript = sieve_file_script_open_from_path
+		(fstorage, fsctx->tmp_path, scriptname, &error);
+
+	if ( tmpscript == NULL ) {
+		if ( error == SIEVE_ERROR_NOT_FOUND ) {
+			sieve_storage_set_critical(sctx->storage, "save: "
+				"Temporary script file `%s' got lost, "
+				"which should not happen (possibly deleted externally).",
+				fsctx->tmp_path);
+		} else {
+			sieve_storage_set_critical(sctx->storage, "save: "
+				"Failed to open temporary script file `%s'",
+				fsctx->tmp_path);
+		}
+		return NULL;
+	}
+
+	return &tmpscript->script;
+}
+
+static void sieve_file_storage_update_mtime
+(struct sieve_storage *storage, const char *path, time_t mtime)
+{
+	struct utimbuf times = { .actime = mtime, .modtime = mtime };
+
+	if ( utime(path, &times) < 0 ) {
+		switch ( errno ) {	
+		case ENOENT:
+			break;
+		case EACCES:
+			e_error(storage->event, "save: %s",
+				eacces_error_get("utime", path));
+			break;
+		default:
+			e_error(storage->event,
+				"save: utime(%s) failed: %m", path);
+		}
+	}
+}
+
+int sieve_file_storage_save_commit
+(struct sieve_storage_save_context *sctx)
+{
+	struct sieve_file_save_context *fsctx =
+		(struct sieve_file_save_context *)sctx;
+	struct sieve_storage *storage = sctx->storage;
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)sctx->storage;
+	const char *dest_path;
+	bool failed = FALSE;
+
+	i_assert(fsctx->output == NULL);
+
+	T_BEGIN {
+		dest_path = t_strconcat(fstorage->path, "/",
+			sieve_script_file_from_name(sctx->scriptname), NULL);
+
+		failed = ( sieve_file_storage_script_move(fsctx, dest_path) < 0 );
+		if ( sctx->mtime != (time_t)-1 )
+			sieve_file_storage_update_mtime(storage, dest_path, sctx->mtime);
+	} T_END;
+	
+	return ( failed ? -1 : 0 );
+}
+
+void sieve_file_storage_save_cancel(struct sieve_storage_save_context *sctx)
+{
+	struct sieve_file_save_context *fsctx =
+		(struct sieve_file_save_context *)sctx;
+	struct sieve_storage *storage = sctx->storage;
+
+	if (fsctx->tmp_path != NULL &&
+		unlink(fsctx->tmp_path) < 0 && errno != ENOENT) {
+		e_warning(storage->event, "save: unlink(%s) failed: %m",
+			  fsctx->tmp_path);
+	}
+
+	i_assert(fsctx->output == NULL);
+}
+
+static int
+sieve_file_storage_save_to(struct sieve_file_storage *fstorage,
+	string_t *temp_path, struct istream *input,
+	const char *target)
+{
+	struct sieve_storage *storage = &fstorage->storage;
+	struct ostream *output;
+	int fd;
+
+	// FIXME: move this to base class
+	// FIXME: use io_stream_temp
+
+	fd = safe_mkstemp_hostpid
+		(temp_path, fstorage->file_create_mode, (uid_t)-1, (gid_t)-1);
+	if ( fd < 0 ) {
+		if ( errno == EACCES ) {
+			sieve_storage_set_critical(storage,
+				"Failed to create temporary file: %s",
+				eacces_error_get_creating("open", str_c(temp_path)));
+		} else {
+			sieve_storage_set_critical(storage,
+				"Failed to create temporary file: open(%s) failed: %m",
+				str_c(temp_path));
+		}
+		return -1;
+	}
+
+	output = o_stream_create_fd(fd, 0);
+	switch ( o_stream_send_istream(output, input) ) {
+	case OSTREAM_SEND_ISTREAM_RESULT_FINISHED:
+		break;
+	case OSTREAM_SEND_ISTREAM_RESULT_WAIT_INPUT:
+	case OSTREAM_SEND_ISTREAM_RESULT_WAIT_OUTPUT:
+		i_unreached();
+	case OSTREAM_SEND_ISTREAM_RESULT_ERROR_INPUT:
+		sieve_storage_set_critical(storage,
+			"read(%s) failed: %s", i_stream_get_name(input),
+			i_stream_get_error(input));
+		o_stream_destroy(&output);
+		i_unlink(str_c(temp_path));
+		return -1;
+	case OSTREAM_SEND_ISTREAM_RESULT_ERROR_OUTPUT:
+		sieve_storage_set_critical(storage,
+			"write(%s) failed: %s", str_c(temp_path),
+			o_stream_get_error(output));
+		o_stream_destroy(&output);
+		i_unlink(str_c(temp_path));
+		return -1;
+	}
+	o_stream_destroy(&output);
+
+	if ( rename(str_c(temp_path), target) < 0 ) {
+		if ( ENOQUOTA(errno) ) {
+			sieve_storage_set_error(storage,
+				SIEVE_ERROR_NO_QUOTA,
+				"Not enough disk quota");
+		} else if ( errno == EACCES ) {
+			sieve_storage_set_critical(storage,
+				"%s", eacces_error_get("rename", target));
+		} else {
+			sieve_storage_set_critical(storage,
+				"rename(%s, %s) failed: %m",
+				str_c(temp_path), target);
+		}
+		i_unlink(str_c(temp_path));
+	}
+	return 0;
+}
+
+int sieve_file_storage_save_as
+(struct sieve_storage *storage, struct istream *input,
+	const char *name)
+{
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)storage;
+	string_t *temp_path;
+	const char *dest_path;
+
+	temp_path = t_str_new(256);
+	str_append(temp_path, fstorage->path);
+	str_append(temp_path, "/tmp/");
+	str_append(temp_path, sieve_script_file_from_name(name));
+	str_append_c(temp_path, '.');
+
+	dest_path = t_strconcat(fstorage->path, "/",
+		sieve_script_file_from_name(name), NULL);
+
+	return sieve_file_storage_save_to
+		(fstorage, temp_path, input, dest_path);
+}
+
+int sieve_file_storage_save_as_active
+(struct sieve_storage *storage, struct istream *input,
+	time_t mtime)
+{
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)storage;
+	string_t *temp_path;
+
+	temp_path = t_str_new(256);
+	str_append(temp_path, fstorage->active_path);
+	str_append_c(temp_path, '.');
+
+	if ( sieve_file_storage_save_to
+		(fstorage, temp_path, input, fstorage->active_path) < 0 )
+		return -1;
+
+	sieve_file_storage_update_mtime
+		(storage, fstorage->active_path, mtime);
+	return 0;
+}
+
diff --git a/pigeonhole/src/lib-sieve/storage/file/sieve-file-storage.c b/pigeonhole/src/lib-sieve/storage/file/sieve-file-storage.c
new file mode 100644
index 0000000..76b3ebf
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/file/sieve-file-storage.c
@@ -0,0 +1,918 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "path-util.h"
+#include "home-expand.h"
+#include "ioloop.h"
+#include "mkdir-parents.h"
+#include "eacces-error.h"
+#include "unlink-old-files.h"
+#include "mail-storage-private.h"
+
+#include "sieve.h"
+#include "sieve-common.h"
+#include "sieve-settings.h"
+#include "sieve-error-private.h"
+#include "sieve-settings.h"
+
+#include "sieve-file-storage.h"
+
+#include <stdio.h>
+#include <unistd.h>
+#include <ctype.h>
+#include <utime.h>
+#include <sys/time.h>
+
+
+#define MAX_DIR_CREATE_MODE 0770
+
+/*
+ * Utility
+ */
+
+const char *sieve_file_storage_path_extend
+(struct sieve_file_storage *fstorage, const char *filename)
+{
+	const char *path = fstorage->path;
+
+	if ( path[strlen(path)-1] == '/' )
+		return t_strconcat(path, filename, NULL);
+
+	return t_strconcat(path, "/", filename , NULL);
+}
+
+/*
+ *
+ */
+
+static int sieve_file_storage_stat
+(struct sieve_file_storage *fstorage, const char *path,
+	enum sieve_error *error_r)
+{
+	struct sieve_storage *storage = &fstorage->storage;
+	struct stat st;
+	const char *abspath, *error;
+
+	if ( lstat(path, &st) == 0 ) {
+		fstorage->lnk_st = st;
+
+		if ( !S_ISLNK(st.st_mode) || stat(path, &st) == 0 ) {
+			fstorage->st = st;
+			return 0;
+		}
+	}
+
+	switch ( errno ) {
+	case ENOENT:
+		if (t_abspath(path, &abspath, &error) < 0) {
+			sieve_storage_set_critical(storage,
+				"t_abspath(%s) failed: %s", path, error);
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+			break;
+		}
+		e_debug(storage->event, "Storage path `%s' not found", abspath);
+		sieve_storage_set_internal_error(storage); // should be overriden
+		*error_r = SIEVE_ERROR_NOT_FOUND;
+		break;
+	case EACCES:
+		sieve_storage_set_critical(storage,
+			"Failed to stat sieve storage path: %s",
+			eacces_error_get("stat", path));
+		*error_r = SIEVE_ERROR_NO_PERMISSION;
+		break;
+	default:
+		sieve_storage_set_critical(storage,
+			"Failed to stat sieve storage path: "
+			"stat(%s) failed: %m", path);
+		*error_r = SIEVE_ERROR_TEMP_FAILURE;
+		break;
+	}
+
+	return -1;
+}
+
+static const char *sieve_storage_get_relative_link_path
+	(const char *active_path, const char *storage_dir)
+{
+	const char *link_path, *p;
+	size_t pathlen;
+
+	/* Determine to what extent the sieve storage and active script
+	 * paths match up. This enables the managed symlink to be short and the
+	 * sieve storages can be moved around without trouble (if the active
+	 * script path is common to the script storage).
+	 */
+	p = strrchr(active_path, '/');
+	if ( p == NULL ) {
+		link_path = storage_dir;
+	} else {
+		pathlen = p - active_path;
+
+		if ( strncmp( storage_dir, active_path, pathlen ) == 0 &&
+			(storage_dir[pathlen] == '/' || storage_dir[pathlen] == '\0') )
+		{
+			if ( storage_dir[pathlen] == '\0' )
+				link_path = "";
+			else
+				link_path = storage_dir + pathlen + 1;
+		} else
+			link_path = storage_dir;
+	}
+
+	/* Add trailing '/' when link path is not empty
+	 */
+	pathlen = strlen(link_path);
+	if ( pathlen != 0 && link_path[pathlen-1] != '/')
+		return t_strconcat(link_path, "/", NULL);
+
+	return t_strdup(link_path);
+}
+
+static mode_t get_dir_mode(mode_t mode)
+{
+	/* Add the execute bit if either read or write bit is set */
+
+	if ((mode & 0600) != 0) mode |= 0100;
+	if ((mode & 0060) != 0) mode |= 0010;
+	if ((mode & 0006) != 0) mode |= 0001;
+
+	return mode;
+}
+
+static int mkdir_verify
+(struct sieve_storage *storage, const char *dir,
+	mode_t mode, gid_t gid, const char *gid_origin)
+{
+	struct stat st;
+
+	if ( stat(dir, &st) == 0 )
+		return 0;
+
+	if ( errno == EACCES ) {
+		e_error(storage->event,	"mkdir_verify: %s",
+			eacces_error_get("stat", dir));
+		return -1;
+	} else if ( errno != ENOENT ) {
+		e_error(storage->event, "mkdir_verify: "
+			"stat(%s) failed: %m", dir);
+		return -1;
+	}
+
+	if ( mkdir_parents_chgrp(dir, mode, gid, gid_origin) == 0 ) {
+		e_debug(storage->event, "Created storage directory %s", dir);
+		return 0;
+	}
+
+	switch ( errno ) {
+	case EEXIST:
+		return 0;
+	case ENOENT:
+		e_error(storage->event,
+			"Storage was deleted while it was being created");
+		break;
+	case EACCES:
+		e_error(storage->event, "%s",
+			eacces_error_get_creating("mkdir_parents_chgrp", dir));
+		break;
+	default:
+		e_error(storage->event,
+			"mkdir_parents_chgrp(%s) failed: %m", dir);
+		break;
+	}
+
+	return -1;
+}
+
+static int check_tmp(struct sieve_storage *storage, const char *path)
+{
+	struct stat st;
+
+	/* If tmp/ directory exists, we need to clean it up once in a while */
+	if ( stat(path, &st) < 0 ) {
+		if ( errno == ENOENT )
+			return 0;
+		if ( errno == EACCES ) {
+			e_error(storage->event, "check_tmp: %s",
+				eacces_error_get("stat", path));
+			return -1;
+		}
+		e_error(storage->event, "check_tmp: stat(%s) failed: %m", path);
+		return -1;
+	}
+
+	if ( st.st_atime > st.st_ctime + SIEVE_FILE_STORAGE_TMP_DELETE_SECS ) {
+		/* The directory should be empty. we won't do anything
+		   until ctime changes. */
+	} else if ( st.st_atime < ioloop_time - SIEVE_FILE_STORAGE_TMP_SCAN_SECS ) {
+		/* Time to scan */
+		(void)unlink_old_files(path, "",
+			ioloop_time - SIEVE_FILE_STORAGE_TMP_DELETE_SECS);
+	}
+	return 1;
+}
+
+static struct sieve_storage *sieve_file_storage_alloc(void)
+{
+	struct sieve_file_storage *fstorage;
+	pool_t pool;
+
+	pool = pool_alloconly_create("sieve_file_storage", 2048);
+	fstorage = p_new(pool, struct sieve_file_storage, 1);
+	fstorage->storage = sieve_file_storage;
+	fstorage->storage.pool = pool;
+
+	return &fstorage->storage;
+}
+
+static int sieve_file_storage_get_full_path
+(struct sieve_file_storage *fstorage, const char **storage_path,
+	enum sieve_error *error_r)
+{
+	struct sieve_storage *storage = &fstorage->storage;
+	struct sieve_instance *svinst = storage->svinst;
+	const char *path = *storage_path;
+
+	/* Get full storage path */
+
+	if ( path != NULL &&
+		((path[0] == '~' && (path[1] == '/' || path[1] == '\0')) ||
+		(((svinst->flags & SIEVE_FLAG_HOME_RELATIVE) != 0 ) && path[0] != '/')) ) {
+		/* home-relative path. change to absolute. */
+		const char *home = sieve_environment_get_homedir(svinst);
+
+		if ( home != NULL ) {
+			if ( path[0] == '~' && (path[1] == '/' || path[1] == '\0') )
+				path = home_expand_tilde(path, home);
+			else
+				path = t_strconcat(home, "/", path, NULL);
+		} else {
+			sieve_storage_set_critical(storage,
+				"Sieve storage path `%s' is relative to home directory, "
+				"but home directory is not available.", path);
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+			return -1;
+		}
+	}
+	*storage_path = path;
+	return 0;
+}
+
+static int sieve_file_storage_get_full_active_path
+(struct sieve_file_storage *fstorage, const char **active_path,
+	enum sieve_error *error_r)
+{
+	struct sieve_storage *storage = &fstorage->storage;
+	struct sieve_instance *svinst = storage->svinst;
+	const char *path = *active_path;
+
+	if ( path != NULL && *path != '\0' &&
+		((path[0] == '~' && (path[1] == '/' || path[1] == '\0')) ||
+		(((svinst->flags & SIEVE_FLAG_HOME_RELATIVE) != 0 ) && path[0] != '/'))
+		)	{
+		/* home-relative path. change to absolute. */
+		const char *home = sieve_environment_get_homedir(svinst);
+
+		if ( home != NULL ) {
+			if ( path[0] == '~' && (path[1] == '/' || path[1] == '\0') )
+				path = home_expand_tilde(path, home);
+			else
+				path = t_strconcat(home, "/", path, NULL);
+		} else {
+			sieve_storage_set_critical(storage,
+				"Sieve storage active script path `%s' is relative to home directory, "
+				"but home directory is not available.", path);
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+			return -1;
+		}
+	}
+	*active_path = path;
+	return 0;
+}
+
+static int sieve_file_storage_init_common
+(struct sieve_file_storage *fstorage, const char *active_path,
+	const char *storage_path, bool exists, enum sieve_error *error_r)
+	ATTR_NULL(2, 3)
+{
+	struct sieve_storage *storage = &fstorage->storage;
+	const char *tmp_dir, *link_path, *active_fname, *storage_dir, *error;
+	bool have_link = FALSE;
+	int ret;
+
+	i_assert( storage_path != NULL || active_path != NULL );
+
+	fstorage->prev_mtime = (time_t)-1;
+
+	/* Get active script path */
+
+	if ( sieve_file_storage_get_full_active_path
+		(fstorage, &active_path, error_r) < 0 )
+		return -1;
+
+	/* Get the filename for the active script link */
+
+	active_fname = NULL;
+	if ( active_path != NULL && *active_path != '\0' ) {
+		const char *active_dir;
+
+		active_fname = strrchr(active_path, '/');
+		if ( active_fname == NULL ) {
+			active_fname = active_path;
+			active_dir = "";
+		} else {
+			active_dir = t_strdup_until(active_path, active_fname);
+			active_fname++;
+		}
+
+		if ( *active_fname == '\0' ) {
+			/* Link cannot be just a path ending in '/' */
+			sieve_storage_set_critical(storage,
+				"Path to %sscript must include the filename (path=%s)",
+				( storage_path != NULL ? "active link/" : "" ),
+				active_path);
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+			return -1;
+		}
+
+		if (t_realpath(active_dir, &active_dir, &error) < 0) {
+			if (errno != ENOENT) {
+				e_error(storage->event,
+					"Failed to normalize active script directory "
+					"(path=%s): %s", active_dir, error);
+				*error_r = SIEVE_ERROR_TEMP_FAILURE;
+				return -1;
+			} 
+			e_debug(storage->event,
+				"Failed to normalize active script directory "
+				"(path=%s): "
+				"Part of the path does not exist (yet)",
+				active_dir);			
+		} else {
+			active_path = t_abspath_to(active_fname, active_dir);
+		}
+
+		e_debug(storage->event, "Using %sSieve script path: %s",
+			(storage_path != NULL ? "active " : ""), active_path);
+
+		fstorage->active_path = p_strdup(storage->pool, active_path);
+		fstorage->active_fname = p_strdup(storage->pool, active_fname);
+	}
+
+	/* Determine storage path */
+
+	storage_dir = storage_path;
+	if ( storage_path != NULL && *storage_path != '\0' ) {
+		e_debug(storage->event, "Using script storage path: %s",
+			storage_path);
+		have_link = TRUE;
+
+	} else {
+		if ((storage->flags & SIEVE_STORAGE_FLAG_READWRITE) != 0 ) {
+			sieve_storage_set_critical(storage,
+				"Storage path cannot be empty for write access");
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+			return -1;
+		}
+
+		storage_path = active_path;
+	}
+
+	i_assert(storage_path != NULL);
+
+	/* Prepare for write access */
+
+	if ( (storage->flags & SIEVE_STORAGE_FLAG_READWRITE) != 0 ) {
+		mode_t dir_create_mode, file_create_mode;
+		gid_t file_create_gid;
+		const char *file_create_gid_origin;
+
+		/* Use safe permission defaults */
+		file_create_mode = 0600;
+		dir_create_mode = 0700;
+		file_create_gid = (gid_t)-1;
+		file_create_gid_origin = "defaults";
+
+		/* Get actual permissions */
+		if ( exists ) {
+			file_create_mode = (fstorage->st.st_mode & 0666) | 0600;
+			dir_create_mode = (fstorage->st.st_mode & 0777) | 0700;
+			file_create_gid_origin = storage_dir;
+
+			if ( !S_ISDIR(fstorage->st.st_mode) ) {
+				/* We're getting permissions from a file.
+				   Apply +x modes as necessary. */
+				dir_create_mode = get_dir_mode(dir_create_mode);
+			}
+
+			if (S_ISDIR(fstorage->st.st_mode) &&
+				(fstorage->st.st_mode & S_ISGID) != 0) {
+				/* Directory's GID is used automatically for new files */
+				file_create_gid = (gid_t)-1;
+			} else if ((fstorage->st.st_mode & 0070) >> 3 ==
+				(fstorage->st.st_mode & 0007)) {
+				/* Group has same permissions as world, so don't bother changing it */
+				file_create_gid = (gid_t)-1;
+			} else if (getegid() == fstorage->st.st_gid) {
+				/* Using our own gid, no need to change it */
+				file_create_gid = (gid_t)-1;
+			} else {
+				file_create_gid = fstorage->st.st_gid;
+			}
+		}
+
+		e_debug(storage->event,
+			"Using permissions from %s: mode=0%o gid=%ld",
+			file_create_gid_origin, (int)dir_create_mode,
+			file_create_gid == (gid_t)-1 ?
+				-1L : (long)file_create_gid);
+
+		/*
+		 * Ensure sieve local directory structure exists (full autocreate):
+		 *  This currently only consists of a ./tmp direcory
+		 */
+
+		tmp_dir = t_strconcat(storage_path, "/tmp", NULL);
+
+		/* Try to find and clean up tmp dir */
+		if ( (ret=check_tmp(storage, tmp_dir)) < 0 ) {
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+			return -1;
+		}
+
+		/* Auto-create if necessary */
+		if ( ret == 0 && mkdir_verify(storage, tmp_dir,
+			dir_create_mode, file_create_gid, file_create_gid_origin) < 0 ) {
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+			return -1;
+		}
+
+		fstorage->dir_create_mode = dir_create_mode;
+		fstorage->file_create_mode = file_create_mode;
+		fstorage->file_create_gid = file_create_gid;
+	}
+
+	if ( !exists && sieve_file_storage_stat
+		(fstorage, storage_path, error_r) < 0 )
+		return -1;
+
+	if ( have_link ) {
+		if ( t_realpath(storage_path, &storage_path, &error) < 0 ) {
+			e_error(storage->event,
+				"Failed to normalize storage path (path=%s): %s",
+				storage_path, error);
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+			return -1;
+		}
+		if ( active_path != NULL && *active_path != '\0' ) {
+			/* Get the path to be prefixed to the script name in the symlink
+			 * pointing to the active script.
+			 */
+			link_path = sieve_storage_get_relative_link_path
+				(fstorage->active_path, storage_path);
+
+			e_debug(storage->event,
+				"Relative path to sieve storage in active link: %s",
+				link_path);
+
+			fstorage->link_path = p_strdup(storage->pool, link_path);
+		}
+	}
+
+	fstorage->path = p_strdup(storage->pool, storage_path);
+	storage->location = fstorage->path;
+
+	return 0;
+}
+
+static int sieve_file_storage_init
+(struct sieve_storage *storage, const char *const *options,
+	enum sieve_error *error_r)
+{
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)storage;
+	const char *storage_path = storage->location;
+	const char *active_path = "";
+	bool exists = FALSE;
+
+	if ( options != NULL ) {
+		while ( *options != NULL ) {
+			const char *option = *options;
+
+			if ( strncasecmp(option, "active=", 7) == 0 && option[7] != '\0' ) {
+				active_path = option+7;
+			} else {
+				sieve_storage_set_critical(storage,
+					"Invalid option `%s'", option);
+				*error_r = SIEVE_ERROR_TEMP_FAILURE;
+				return -1;
+			}
+
+			options++;
+		}
+	}
+
+	/* Get full storage path */
+
+	if ( sieve_file_storage_get_full_path
+		(fstorage, &storage_path, error_r) < 0 )
+		return -1;
+
+	/* Stat storage directory */
+
+	if ( storage_path != NULL && *storage_path != '\0' ) {
+		if ( sieve_file_storage_stat(fstorage, storage_path, error_r) < 0 ) {
+			if ( *error_r != SIEVE_ERROR_NOT_FOUND )
+				return -1;
+			if ( (storage->flags & SIEVE_STORAGE_FLAG_READWRITE) == 0 ) {
+				/* For backwards compatibility, recognize when storage directory
+				   does not exist while active script exists and is a regular
+				   file. */
+				if ( active_path == NULL || *active_path == '\0' )
+					return -1;
+				if ( sieve_file_storage_get_full_active_path
+					(fstorage, &active_path, error_r) < 0 )
+					return -1;
+				if ( sieve_file_storage_stat
+					(fstorage, active_path, error_r) < 0 )
+					return -1;
+				if ( !S_ISREG(fstorage->lnk_st.st_mode) )
+					return -1;
+				e_debug(storage->event,
+					"Sieve storage path `%s' not found, "
+					"but the active script `%s' is a regular file, "
+					"so this is used for backwards compatibility.",
+					storage_path, active_path);
+				storage_path = NULL;
+			}
+		} else {
+			exists = TRUE;
+
+			if ( !S_ISDIR(fstorage->st.st_mode) ) {
+				if ( (storage->flags & SIEVE_STORAGE_FLAG_READWRITE) != 0 ) {
+					sieve_storage_set_critical(storage,
+						"Sieve storage path `%s' is not a directory, "
+						"but it is to be opened for write access", storage_path);
+					*error_r = SIEVE_ERROR_TEMP_FAILURE;
+					return -1;
+				}
+				if ( active_path != NULL && *active_path != '\0' ) {
+					e_warning(storage->event,
+						  "Explicitly specified active script path `%s' is ignored; "
+						  "storage path `%s' is not a directory",
+						  active_path, storage_path);
+				}
+				active_path = storage_path;
+				storage_path = NULL;
+			} 
+		}
+	}
+
+	if ( active_path == NULL || *active_path == '\0' ) {
+		if ( storage->main_storage ||
+			(storage->flags & SIEVE_STORAGE_FLAG_READWRITE) != 0) {
+			e_debug(storage->event,
+				"Active script path is unconfigured; "
+				"using default (path=%s)",
+				SIEVE_FILE_DEFAULT_PATH);
+			active_path = SIEVE_FILE_DEFAULT_PATH;
+		}
+	}
+
+	return sieve_file_storage_init_common
+		(fstorage, active_path, storage_path, exists, error_r);
+}
+
+static void sieve_file_storage_autodetect
+(struct sieve_file_storage *fstorage, const char **storage_path_r)
+{
+	struct sieve_storage *storage = &fstorage->storage;
+	struct sieve_instance *svinst = storage->svinst;
+	const char *home = sieve_environment_get_homedir(svinst);
+	int mode = ( (storage->flags & SIEVE_STORAGE_FLAG_READWRITE) != 0 ?
+		R_OK|W_OK|X_OK : R_OK|X_OK );
+
+	e_debug(storage->event, "Performing auto-detection");
+
+	/* We'll need to figure out the storage location ourself.
+	 *
+	 * It's $HOME/sieve or /sieve when (presumed to be) chrooted.
+	 */
+	if ( home != NULL && *home != '\0' ) {
+		/* Use default ~/sieve */
+		e_debug(storage->event, "Use home (%s)", home);
+		*storage_path_r = t_strconcat(home, "/sieve", NULL);
+	} else {
+		e_debug(storage->event, "HOME is not set");
+
+		if (access("/sieve", mode) == 0) {
+			*storage_path_r = "/sieve";
+			e_debug(storage->event,
+				"Directory `/sieve' exists, assuming chroot");
+		}
+	}
+}
+
+static int sieve_file_storage_do_init_legacy
+(struct sieve_file_storage *fstorage, const char *active_path,
+	const char *storage_path, enum sieve_error *error_r)
+{
+	struct sieve_storage *storage = &fstorage->storage;
+	bool explicit = FALSE, exists = FALSE;
+
+	if ( storage_path == NULL || *storage_path == '\0' ) {
+		/* Try autodectection */	
+		sieve_file_storage_autodetect(fstorage, &storage_path);
+
+		if ( storage_path != NULL && *storage_path != '\0') {
+			/* Got something: stat it */
+			if (sieve_file_storage_stat
+				(fstorage, storage_path, error_r) < 0 ) {
+				if (*error_r != SIEVE_ERROR_NOT_FOUND) {
+					/* Error */
+					return -1;
+				}
+			} else 	if ( S_ISDIR(fstorage->st.st_mode) ) {
+				/* Success */
+				exists = TRUE;
+			}
+		}
+
+		if ( (storage_path == NULL || *storage_path == '\0') &&
+			(storage->flags & SIEVE_STORAGE_FLAG_READWRITE) != 0 ) {
+			sieve_storage_set_critical(storage,
+				"Could not find storage root directory for write access; "
+				"path was left unconfigured and autodetection failed");
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+			return -1;
+		}
+
+	} else { 
+		/* Get full storage path */
+		if ( sieve_file_storage_get_full_path
+			(fstorage, &storage_path, error_r) < 0 )
+			return -1;
+
+		/* Stat storage directory */
+		if ( sieve_file_storage_stat(fstorage, storage_path, error_r) < 0 ) {
+			if ( (*error_r != SIEVE_ERROR_NOT_FOUND) )
+				return -1;
+			if ( (storage->flags & SIEVE_STORAGE_FLAG_READWRITE) == 0 )
+				storage_path = NULL;
+		} else {
+			exists = TRUE;
+		}
+	
+		/* Storage path must be a directory */
+		if ( exists && !S_ISDIR(fstorage->st.st_mode) ) {
+			sieve_storage_set_critical(storage,
+				"Sieve storage path `%s' configured using sieve_dir "
+				"is not a directory", storage_path);
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+			return -1;
+		}
+
+		explicit = TRUE;
+	}
+
+	if ( (active_path == NULL || *active_path == '\0') ) {
+		if ( storage->main_storage ||
+		(storage->flags & SIEVE_STORAGE_FLAG_READWRITE) != 0) {
+			e_debug(storage->event,
+				"Active script path is unconfigured; "
+				"using default (path=%s)",
+				SIEVE_FILE_DEFAULT_PATH);
+			active_path = SIEVE_FILE_DEFAULT_PATH;
+		} else {
+			return -1;
+		}
+	}
+
+	if ( !explicit && !exists &&
+		active_path != NULL && *active_path != '\0' &&
+		(storage->flags & SIEVE_STORAGE_FLAG_READWRITE) == 0 )
+		storage_path = NULL;
+	
+	if ( sieve_file_storage_init_common
+		(fstorage, active_path, storage_path, exists, error_r) < 0 )
+		return -1;
+	return 0;
+}
+
+struct sieve_storage *sieve_file_storage_init_legacy
+(struct sieve_instance *svinst, const char *active_path,
+	const char *storage_path, enum sieve_storage_flags flags,
+	enum sieve_error *error_r)
+{
+	struct sieve_storage *storage;
+	struct sieve_file_storage *fstorage;
+
+	storage = sieve_storage_alloc(svinst, NULL, &sieve_file_storage,
+				      "", flags, TRUE);
+	fstorage = (struct sieve_file_storage *)storage;
+
+	T_BEGIN {
+		if ( sieve_file_storage_do_init_legacy
+			(fstorage, active_path, storage_path, error_r) < 0 ) {
+			sieve_storage_unref(&storage);
+			storage = NULL;
+		}
+	} T_END;
+
+	return storage;
+}
+
+struct sieve_file_storage *sieve_file_storage_init_from_path
+(struct sieve_instance *svinst, const char *path,
+	enum sieve_storage_flags flags, enum sieve_error *error_r)
+{
+	struct sieve_storage *storage;
+	struct sieve_file_storage *fstorage;
+
+	i_assert( path != NULL );
+
+	storage = sieve_storage_alloc(svinst, NULL, &sieve_file_storage,
+				      "", flags, FALSE);
+	fstorage = (struct sieve_file_storage *)storage;
+	
+	T_BEGIN {
+		if ( sieve_file_storage_init_common
+			(fstorage, path, NULL, FALSE, error_r) < 0 ) {
+			sieve_storage_unref(&storage);
+			fstorage = NULL;
+		}
+	} T_END;
+
+	return fstorage;
+}
+
+static int sieve_file_storage_is_singular
+(struct sieve_storage *storage)
+{
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)storage;
+	struct stat st;
+
+	if ( fstorage->active_path == NULL )
+		return 1;
+
+	/* Stat the file */
+	if ( lstat(fstorage->active_path, &st) != 0 ) {
+		if ( errno != ENOENT ) {
+			sieve_storage_set_critical(storage,
+				"Failed to stat active sieve script symlink (%s): %m.",
+				fstorage->active_path);
+			return -1;
+		}
+		return 0;
+	}
+
+	if ( S_ISLNK( st.st_mode ) )
+		return 0;
+	if ( !S_ISREG( st.st_mode ) ) {
+		sieve_storage_set_critical(storage,
+			"Active sieve script file '%s' is no symlink nor a regular file.",
+			fstorage->active_path);
+		return -1;
+	}
+	return 1;
+}
+
+/*
+ *
+ */
+
+static int sieve_file_storage_get_last_change
+(struct sieve_storage *storage, time_t *last_change_r)
+{
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)storage;
+	struct stat st;
+
+	if ( fstorage->prev_mtime == (time_t)-1 ) {
+		/* Get the storage mtime before we modify it ourself */
+		if ( stat(fstorage->path, &st) < 0 ) {
+			if ( errno != ENOENT ) {
+				e_error(storage->event,
+					"stat(%s) failed: %m",
+					fstorage->path);
+				return -1;
+			}
+			st.st_mtime = 0;
+		}
+
+		fstorage->prev_mtime = st.st_mtime;
+	}
+		
+	if ( last_change_r != NULL )
+		*last_change_r = fstorage->prev_mtime;
+	return 0;
+}
+
+int sieve_file_storage_pre_modify
+(struct sieve_storage *storage)
+{
+	i_assert( (storage->flags & SIEVE_STORAGE_FLAG_READWRITE) != 0 );
+
+	return sieve_storage_get_last_change(storage, NULL);
+}
+
+static void sieve_file_storage_set_modified
+(struct sieve_storage *storage, time_t mtime)
+{
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)storage;
+	struct utimbuf times;
+	time_t cur_mtime;
+
+	if ( mtime != (time_t)-1 ) {
+		if ( sieve_storage_get_last_change(storage, &cur_mtime) >= 0 &&
+			cur_mtime > mtime )
+			return;
+	} else {
+		mtime = ioloop_time;
+	}
+
+	times.actime = mtime;
+	times.modtime = mtime;
+	if ( utime(fstorage->path, &times) < 0 ) {
+		switch ( errno ) {
+		case ENOENT:
+			break;
+		case EACCES:
+			e_error(storage->event, "%s",
+				eacces_error_get("utime", fstorage->path));
+			break;
+		default:
+			e_error(storage->event,
+				"utime(%s) failed: %m", fstorage->path);
+		}
+	} else {
+		fstorage->prev_mtime = mtime;
+	}
+}
+
+/*
+ * Script access
+ */
+
+static struct sieve_script *sieve_file_storage_get_script
+(struct sieve_storage *storage, const char *name)
+{
+	struct sieve_file_storage *fstorage =
+		(struct sieve_file_storage *)storage;
+	struct sieve_file_script *fscript;
+
+	T_BEGIN {
+		fscript = sieve_file_script_init_from_name(fstorage, name);
+	} T_END;
+
+	return &fscript->script;
+}
+
+/*
+ * Driver definition
+ */
+
+const struct sieve_storage sieve_file_storage = {
+	.driver_name = SIEVE_FILE_STORAGE_DRIVER_NAME,
+	.version = 0,
+	.allows_synchronization = TRUE,
+	.v = {
+		.alloc = sieve_file_storage_alloc,
+		.init = sieve_file_storage_init,
+
+		.get_last_change = sieve_file_storage_get_last_change,
+		.set_modified = sieve_file_storage_set_modified,
+
+		.is_singular = sieve_file_storage_is_singular,
+
+		.get_script = sieve_file_storage_get_script,
+
+		.get_script_sequence = sieve_file_storage_get_script_sequence,
+		.script_sequence_next = sieve_file_script_sequence_next,
+		.script_sequence_destroy = sieve_file_script_sequence_destroy,
+
+		.active_script_get_name = sieve_file_storage_active_script_get_name,
+		.active_script_open = sieve_file_storage_active_script_open,
+		.deactivate = sieve_file_storage_deactivate,
+		.active_script_get_last_change =
+			sieve_file_storage_active_script_get_last_change,
+
+		.list_init = sieve_file_storage_list_init,
+		.list_next = sieve_file_storage_list_next,
+		.list_deinit = sieve_file_storage_list_deinit,
+
+		.save_alloc = sieve_file_storage_save_alloc,
+		.save_init = sieve_file_storage_save_init,
+		.save_continue = sieve_file_storage_save_continue,
+		.save_finish = sieve_file_storage_save_finish,
+		.save_get_tempscript = sieve_file_storage_save_get_tempscript,
+		.save_cancel = sieve_file_storage_save_cancel,
+		.save_commit = sieve_file_storage_save_commit,
+		.save_as = sieve_file_storage_save_as,
+		.save_as_active = sieve_file_storage_save_as_active,
+
+		.quota_havespace = sieve_file_storage_quota_havespace
+	}
+};
diff --git a/pigeonhole/src/lib-sieve/storage/file/sieve-file-storage.h b/pigeonhole/src/lib-sieve/storage/file/sieve-file-storage.h
new file mode 100644
index 0000000..ea7b92f
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/file/sieve-file-storage.h
@@ -0,0 +1,186 @@
+#ifndef SIEVE_FILE_STORAGE_H
+#define SIEVE_FILE_STORAGE_H
+
+#include "lib.h"
+#include "mail-user.h"
+
+#include "sieve.h"
+#include "sieve-script-private.h"
+#include "sieve-storage-private.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#define SIEVE_FILE_READ_BLOCK_SIZE (1024*8)
+
+#define SIEVE_FILE_DEFAULT_PATH "~/.dovecot."SIEVE_SCRIPT_FILEEXT
+
+/* How often to scan tmp/ directory for old files (based on dir's atime) */
+#define SIEVE_FILE_STORAGE_TMP_SCAN_SECS (8*60*60)
+/* Delete files having ctime older than this from tmp/. 36h is standard. */
+#define SIEVE_FILE_STORAGE_TMP_DELETE_SECS (36*60*60)
+
+/*
+ * Storage class
+ */
+
+struct sieve_file_storage {
+	struct sieve_storage storage;
+
+	const char *path;
+	const char *active_path;
+	const char *active_fname;
+	const char *link_path;
+
+	struct stat st;
+	struct stat lnk_st;
+
+	mode_t dir_create_mode;
+	mode_t file_create_mode;
+	gid_t file_create_gid;
+
+	time_t prev_mtime;
+};
+
+const char *sieve_file_storage_path_extend
+	(struct sieve_file_storage *fstorage, const char *filename);
+
+struct sieve_file_storage *sieve_file_storage_init_from_path
+(struct sieve_instance *svinst, const char *path,
+	enum sieve_storage_flags flags, enum sieve_error *error_r)
+	ATTR_NULL(4);
+
+int sieve_file_storage_pre_modify
+	(struct sieve_storage *storage);
+
+/* Active script */
+
+int sieve_file_storage_active_replace_link
+	(struct sieve_file_storage *fstorage, const char *link_path);
+bool sieve_file_storage_active_rescue_regular
+	(struct sieve_file_storage *fstorage);
+
+int sieve_file_storage_active_script_get_name
+	(struct sieve_storage *storage, const char **name_r);
+struct sieve_script *sieve_file_storage_active_script_open
+	(struct sieve_storage *storage);
+
+int sieve_file_storage_active_script_get_file
+	(struct sieve_file_storage *fstorage, const char **file_r);
+int sieve_file_storage_active_script_is_no_link
+	(struct sieve_file_storage *fstorage);
+
+int sieve_file_storage_deactivate
+	(struct sieve_storage *storage);
+
+int sieve_file_storage_active_script_get_last_change
+	(struct sieve_storage *storage, time_t *last_change_r);
+
+/* Listing */
+
+struct sieve_storage_list_context *sieve_file_storage_list_init
+	(struct sieve_storage *storage);
+const char *sieve_file_storage_list_next
+	(struct sieve_storage_list_context *ctx, bool *active);
+int sieve_file_storage_list_deinit
+	(struct sieve_storage_list_context *lctx);
+
+/* Saving */
+
+struct sieve_storage_save_context *
+sieve_file_storage_save_alloc(struct sieve_storage *storage);
+int sieve_file_storage_save_init(struct sieve_storage_save_context *sctx,
+				 const char *scriptname, struct istream *input);
+int sieve_file_storage_save_continue
+	(struct sieve_storage_save_context *sctx);
+int sieve_file_storage_save_finish
+	(struct sieve_storage_save_context *sctx);
+struct sieve_script *sieve_file_storage_save_get_tempscript
+	(struct sieve_storage_save_context *sctx);
+int sieve_file_storage_save_commit
+	(struct sieve_storage_save_context *sctx);
+void sieve_file_storage_save_cancel
+	(struct sieve_storage_save_context *sctx);
+
+int sieve_file_storage_save_as
+	(struct sieve_storage *storage, struct istream *input,
+		const char *name);
+int sieve_file_storage_save_as_active
+	(struct sieve_storage *storage, struct istream *input,
+		time_t mtime);
+
+/* Quota */
+
+int sieve_file_storage_quota_havespace
+(struct sieve_storage *storage, const char *scriptname, size_t size,
+	enum sieve_storage_quota *quota_r, uint64_t *limit_r);
+
+/*
+ * Sieve script filenames
+ */
+
+const char *sieve_script_file_get_scriptname(const char *filename);
+const char *sieve_script_file_from_name(const char *name);
+
+/*
+ * Script class
+ */
+
+struct sieve_file_script {
+	struct sieve_script script;
+
+	struct stat st;
+	struct stat lnk_st;
+
+	const char *path;
+	const char *dirpath;
+	const char *filename;
+	const char *binpath;
+	const char *binprefix;
+
+	time_t prev_mtime;
+};
+
+struct sieve_file_script *sieve_file_script_init_from_filename
+	(struct sieve_file_storage *fstorage, const char *filename,
+		const char *scriptname);
+struct sieve_file_script *sieve_file_script_open_from_filename
+	(struct sieve_file_storage *fstorage, const char *filename,
+		const char *scriptname);
+struct sieve_file_script *sieve_file_script_init_from_name
+	(struct sieve_file_storage *fstorage, const char *name);
+struct sieve_file_script *sieve_file_script_open_from_name
+	(struct sieve_file_storage *fstorage, const char *name);
+
+struct sieve_file_script *sieve_file_script_init_from_path
+	(struct sieve_file_storage *fstorage, const char *path,
+		const char *scriptname, enum sieve_error *error_r)
+		ATTR_NULL(4);
+struct sieve_file_script *sieve_file_script_open_from_path
+	(struct sieve_file_storage *fstorage, const char *path,
+		const char *scriptname, enum sieve_error *error_r)
+		ATTR_NULL(4);
+
+/* Return directory where script resides in. Returns NULL if this is not a file
+ * script.
+ */
+const char *sieve_file_script_get_dirpath
+	(const struct sieve_script *script);
+
+/* Return full path to file script. Returns NULL if this is not a file script.
+ */
+const char *sieve_file_script_get_path
+	(const struct sieve_script *script);
+
+/*
+ * Script sequence
+ */
+
+struct sieve_script_sequence *sieve_file_storage_get_script_sequence
+	(struct sieve_storage *storage, enum sieve_error *error_r);
+
+struct sieve_script *sieve_file_script_sequence_next
+	(struct sieve_script_sequence *seq, enum sieve_error *error_r);
+void sieve_file_script_sequence_destroy(struct sieve_script_sequence *seq);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/storage/ldap/Makefile.am b/pigeonhole/src/lib-sieve/storage/ldap/Makefile.am
new file mode 100644
index 0000000..86df92c
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/ldap/Makefile.am
@@ -0,0 +1,32 @@
+noinst_LTLIBRARIES = libsieve_storage_ldap.la
+
+sieve_plugindir = $(dovecot_moduledir)/sieve
+sieve_plugin_LTLIBRARIES =
+
+AM_CPPFLAGS = \
+	$(LIBDOVECOT_INCLUDE) \
+	-I$(top_srcdir) \
+	-I$(top_srcdir)/src/lib-sieve
+
+ldap_sources = \
+	sieve-ldap-db.c \
+	sieve-ldap-script.c \
+	sieve-ldap-storage.c \
+	sieve-ldap-storage-settings.c
+
+libsieve_storage_ldap_la_SOURCES = $(ldap_sources)
+libsieve_storage_ldap_la_LIBADD = $(LDAP_LIBS)
+
+noinst_HEADERS = \
+	sieve-ldap-db.h \
+	sieve-ldap-storage.h
+
+if LDAP_PLUGIN
+sieve_plugin_LTLIBRARIES += lib10_sieve_storage_ldap_plugin.la
+
+lib10_sieve_storage_ldap_plugin_la_LDFLAGS = -module -avoid-version
+lib10_sieve_storage_ldap_plugin_la_LIBADD = $(LDAP_LIBS)
+lib10_sieve_storage_ldap_plugin_la_DEPENDENCIES = $(LDAP_LIBS)
+lib10_sieve_storage_ldap_plugin_la_CPPFLAGS = $(AM_CPPFLAGS) -DPLUGIN_BUILD
+lib10_sieve_storage_ldap_plugin_la_SOURCES = $(ldap_sources)
+endif
diff --git a/pigeonhole/src/lib-sieve/storage/ldap/Makefile.in b/pigeonhole/src/lib-sieve/storage/ldap/Makefile.in
new file mode 100644
index 0000000..232f781
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/ldap/Makefile.in
@@ -0,0 +1,843 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
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+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	clean-sieve_pluginLTLIBRARIES cscopelist-am ctags ctags-am \
+	distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-sieve_pluginLTLIBRARIES \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
+	pdf pdf-am ps ps-am tags tags-am uninstall uninstall-am \
+	uninstall-sieve_pluginLTLIBRARIES
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/lib-sieve/storage/ldap/sieve-ldap-db.c b/pigeonhole/src/lib-sieve/storage/ldap/sieve-ldap-db.c
new file mode 100644
index 0000000..0a7b440
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/ldap/sieve-ldap-db.c
@@ -0,0 +1,1378 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+
+#include "sieve-common.h"
+
+#include "sieve-ldap-storage.h"
+
+/* FIXME: Imported this from Dovecot auth for now. We're working on a proper
+   lib-ldap, but, until then, some code is duplicated here. */
+
+#if defined(SIEVE_BUILTIN_LDAP) || defined(PLUGIN_BUILD)
+
+#include "net.h"
+#include "ioloop.h"
+#include "array.h"
+#include "hash.h"
+#include "aqueue.h"
+#include "str.h"
+#include "time-util.h"
+#include "env-util.h"
+#include "var-expand.h"
+#include "istream.h"
+
+#include <stddef.h>
+#include <unistd.h>
+
+struct db_ldap_result {
+	int refcount;
+	LDAPMessage *msg;
+};
+
+struct db_ldap_result_iterate_context {
+	pool_t pool;
+
+	struct auth_request *auth_request;
+	const ARRAY_TYPE(ldap_field) *attr_map;
+	unsigned int attr_idx;
+
+	/* attribute name => value */
+	HASH_TABLE(char *, struct db_ldap_value *) ldap_attrs;
+
+	const char *val_1_arr[2];
+	string_t *var, *debug;
+
+	bool skip_null_values;
+	bool iter_dn_values;
+};
+
+struct db_ldap_sasl_bind_context {
+	const char *authcid;
+	const char *passwd;
+	const char *realm;
+	const char *authzid;
+};
+
+static struct ldap_connection *ldap_connections = NULL;
+
+static int db_ldap_bind(struct ldap_connection *conn);
+static void db_ldap_conn_close(struct ldap_connection *conn);
+
+int ldap_deref_from_str(const char *str, int *deref_r)
+{
+	if (strcasecmp(str, "never") == 0)
+		*deref_r = LDAP_DEREF_NEVER;
+	else if (strcasecmp(str, "searching") == 0)
+		*deref_r = LDAP_DEREF_SEARCHING;
+	else if (strcasecmp(str, "finding") == 0)
+		*deref_r = LDAP_DEREF_FINDING;
+	else if (strcasecmp(str, "always") == 0)
+		*deref_r = LDAP_DEREF_ALWAYS;
+	else 
+		return -1;
+	return 0;
+}
+
+int ldap_scope_from_str(const char *str, int *scope_r)
+{
+	if (strcasecmp(str, "base") == 0)
+		*scope_r = LDAP_SCOPE_BASE;
+	else if (strcasecmp(str, "onelevel") == 0)
+		*scope_r = LDAP_SCOPE_ONELEVEL;
+	else if (strcasecmp(str, "subtree") == 0)
+		*scope_r = LDAP_SCOPE_SUBTREE;
+	else
+		return -1;
+	return 0;
+}
+
+#ifdef OPENLDAP_TLS_OPTIONS
+int ldap_tls_require_cert_from_str(const char *str, int *opt_x_tls_r)
+{
+	if (strcasecmp(str, "never") == 0)
+		*opt_x_tls_r = LDAP_OPT_X_TLS_NEVER;
+	else if (strcasecmp(str, "hard") == 0)
+		*opt_x_tls_r = LDAP_OPT_X_TLS_HARD;
+	else if (strcasecmp(str, "demand") == 0)
+		*opt_x_tls_r = LDAP_OPT_X_TLS_DEMAND;
+	else if (strcasecmp(str, "allow") == 0)
+		*opt_x_tls_r = LDAP_OPT_X_TLS_ALLOW;
+	else if (strcasecmp(str, "try") == 0)
+		*opt_x_tls_r = LDAP_OPT_X_TLS_TRY;
+	else
+		return -1;
+	return 0;
+}
+#endif
+
+
+static int ldap_get_errno(struct ldap_connection *conn)
+{
+	struct sieve_storage *storage = &conn->lstorage->storage;
+	int ret, err;
+
+	ret = ldap_get_option(conn->ld, LDAP_OPT_ERROR_NUMBER, (void *) &err);
+	if (ret != LDAP_SUCCESS) {
+		e_error(storage->event, "db: "
+			"Can't get error number: %s",
+			ldap_err2string(ret));
+		return LDAP_UNAVAILABLE;
+	}
+
+	return err;
+}
+
+const char *ldap_get_error(struct ldap_connection *conn)
+{
+	const char *ret;
+	char *str = NULL;
+
+	ret = ldap_err2string(ldap_get_errno(conn));
+
+	ldap_get_option(conn->ld, LDAP_OPT_ERROR_STRING, (void *)&str);
+	if (str != NULL) {
+		ret = t_strconcat(ret, ", ", str, NULL);
+		ldap_memfree(str);
+	}
+	ldap_set_option(conn->ld, LDAP_OPT_ERROR_STRING, NULL);
+	return ret;
+}
+
+static void ldap_conn_reconnect(struct ldap_connection *conn)
+{
+	db_ldap_conn_close(conn);
+	if (sieve_ldap_db_connect(conn) < 0)
+		db_ldap_conn_close(conn);
+}
+
+static int ldap_handle_error(struct ldap_connection *conn)
+{
+	int err = ldap_get_errno(conn);
+
+	switch (err) {
+	case LDAP_SUCCESS:
+		i_unreached();
+	case LDAP_SIZELIMIT_EXCEEDED:
+	case LDAP_TIMELIMIT_EXCEEDED:
+	case LDAP_NO_SUCH_ATTRIBUTE:
+	case LDAP_UNDEFINED_TYPE:
+	case LDAP_INAPPROPRIATE_MATCHING:
+	case LDAP_CONSTRAINT_VIOLATION:
+	case LDAP_TYPE_OR_VALUE_EXISTS:
+	case LDAP_INVALID_SYNTAX:
+	case LDAP_NO_SUCH_OBJECT:
+	case LDAP_ALIAS_PROBLEM:
+	case LDAP_INVALID_DN_SYNTAX:
+	case LDAP_IS_LEAF:
+	case LDAP_ALIAS_DEREF_PROBLEM:
+	case LDAP_FILTER_ERROR:
+		/* invalid input */
+		return -1;
+	case LDAP_SERVER_DOWN:
+	case LDAP_TIMEOUT:
+	case LDAP_UNAVAILABLE:
+	case LDAP_BUSY:
+#ifdef LDAP_CONNECT_ERROR
+	case LDAP_CONNECT_ERROR:
+#endif
+	case LDAP_LOCAL_ERROR:
+	case LDAP_INVALID_CREDENTIALS:
+	case LDAP_OPERATIONS_ERROR:
+	default:
+		/* connection problems */
+		ldap_conn_reconnect(conn);
+		return 0;
+	}
+}
+
+static int db_ldap_request_search(struct ldap_connection *conn,
+				  struct ldap_request *request)
+{
+	struct sieve_storage *storage = &conn->lstorage->storage;
+
+	i_assert(conn->conn_state == LDAP_CONN_STATE_BOUND);
+	i_assert(request->msgid == -1);
+
+	request->msgid =
+		ldap_search(conn->ld, *request->base == '\0' ? NULL :
+			    request->base, request->scope,
+			    request->filter, request->attributes, 0);
+	if (request->msgid == -1) {
+		e_error(storage->event, "db: "
+			"ldap_search(%s) parsing failed: %s",
+			request->filter, ldap_get_error(conn));
+		if (ldap_handle_error(conn) < 0) {
+			/* broken request, remove it */
+			return 0;
+		}
+		return -1;
+	}
+	return 1;
+}
+
+static bool db_ldap_request_queue_next(struct ldap_connection *conn)
+{
+	struct ldap_request *const *requestp, *request;
+	int ret = -1;
+
+	/* connecting may call db_ldap_connect_finish(), which gets us back
+	   here. so do the connection before checking the request queue. */
+	if (sieve_ldap_db_connect(conn) < 0)
+		return FALSE;
+
+	if (conn->pending_count == aqueue_count(conn->request_queue)) {
+		/* no non-pending requests */
+		return FALSE;
+	}
+	if (conn->pending_count > DB_LDAP_MAX_PENDING_REQUESTS) {
+		/* wait until server has replied to some requests */
+		return FALSE;
+	}
+
+	requestp = array_idx(&conn->request_array,
+			     aqueue_idx(conn->request_queue,
+					conn->pending_count));
+	request = *requestp;
+
+	switch (conn->conn_state) {
+	case LDAP_CONN_STATE_DISCONNECTED:
+	case LDAP_CONN_STATE_BINDING:
+		/* wait until we're in bound state */
+		return FALSE;
+	case LDAP_CONN_STATE_BOUND:
+		/* we can do anything in this state */
+		break;
+	}
+
+	ret = db_ldap_request_search(conn, request);
+	if (ret > 0) {
+		/* success */
+		i_assert(request->msgid != -1);
+		conn->pending_count++;
+		return TRUE;
+	} else if (ret < 0) {
+		/* disconnected */
+		return FALSE;
+	} else {
+		/* broken request, remove from queue */
+		aqueue_delete_tail(conn->request_queue);
+		request->callback(conn, request, NULL);
+		return TRUE;
+	}
+}
+
+static bool
+db_ldap_check_limits(struct ldap_connection *conn)
+{
+	struct sieve_storage *storage = &conn->lstorage->storage;
+	struct ldap_request *const *first_requestp;
+	unsigned int count;
+	time_t secs_diff;
+
+	count = aqueue_count(conn->request_queue);
+	if (count == 0)
+		return TRUE;
+
+	first_requestp = array_idx(&conn->request_array,
+				   aqueue_idx(conn->request_queue, 0));
+	secs_diff = ioloop_time - (*first_requestp)->create_time;
+	if (secs_diff > DB_LDAP_REQUEST_LOST_TIMEOUT_SECS) {
+		e_error(storage->event, "db: "
+			"Connection appears to be hanging, reconnecting");
+		ldap_conn_reconnect(conn);
+		return TRUE;
+	}
+	return TRUE;
+}
+
+void db_ldap_request(struct ldap_connection *conn,
+		     struct ldap_request *request)
+{
+	request->msgid = -1;
+	request->create_time = ioloop_time;
+
+	if (!db_ldap_check_limits(conn)) {
+		request->callback(conn, request, NULL);
+		return;
+	}
+
+	aqueue_append(conn->request_queue, &request);
+	(void)db_ldap_request_queue_next(conn);
+}
+
+static int db_ldap_connect_finish(struct ldap_connection *conn, int ret)
+{
+	struct sieve_storage *storage = &conn->lstorage->storage;
+	const struct sieve_ldap_storage_settings *set = &conn->lstorage->set;
+
+	if (ret == LDAP_SERVER_DOWN) {
+		e_error(storage->event, "db: "
+			"Can't connect to server: %s",
+			set->uris != NULL ?
+			set->uris : set->hosts);
+		return -1;
+	}
+	if (ret != LDAP_SUCCESS) {
+		e_error(storage->event, "db: "
+			"binding failed (dn %s): %s",
+			set->dn == NULL ? "(none)" : set->dn,
+			ldap_get_error(conn));
+		return -1;
+	}
+
+	timeout_remove(&conn->to);
+	conn->conn_state = LDAP_CONN_STATE_BOUND;
+	e_debug(storage->event, "db: "
+		"Successfully bound (dn %s)",
+		set->dn == NULL ? "(none)" : set->dn);
+	while (db_ldap_request_queue_next(conn))
+		;
+	return 0;
+}
+
+static void db_ldap_default_bind_finished(struct ldap_connection *conn,
+					  struct db_ldap_result *res)
+{
+	int ret;
+
+	i_assert(conn->pending_count == 0);
+	conn->default_bind_msgid = -1;
+
+	ret = ldap_result2error(conn->ld, res->msg, FALSE);
+	if (db_ldap_connect_finish(conn, ret) < 0) {
+		/* lost connection, close it */
+		db_ldap_conn_close(conn);
+	}
+}
+
+static void db_ldap_abort_requests(struct ldap_connection *conn,
+				   unsigned int max_count,
+				   unsigned int timeout_secs,
+				   bool error, const char *reason)
+{
+	struct sieve_storage *storage = &conn->lstorage->storage;
+	struct ldap_request *const *requestp, *request;
+	time_t diff;
+
+	while (aqueue_count(conn->request_queue) > 0 && max_count > 0) {
+		requestp = array_idx(&conn->request_array,
+				     aqueue_idx(conn->request_queue, 0));
+		request = *requestp;
+
+		diff = ioloop_time - request->create_time;
+		if (diff < (time_t)timeout_secs)
+			break;
+
+		/* timed out, abort */
+		aqueue_delete_tail(conn->request_queue);
+
+		if (request->msgid != -1) {
+			i_assert(conn->pending_count > 0);
+			conn->pending_count--;
+		}
+		if (error)
+			e_error(storage->event, "db: %s", reason);
+		else
+			e_debug(storage->event, "db: %s", reason);
+		request->callback(conn, request, NULL);
+		max_count--;
+	}
+}
+
+static struct ldap_request *
+db_ldap_find_request(struct ldap_connection *conn, int msgid,
+		     unsigned int *idx_r)
+{
+	struct ldap_request *const *requests, *request = NULL;
+	unsigned int i, count;
+
+	count = aqueue_count(conn->request_queue);
+	if (count == 0)
+		return NULL;
+
+	requests = array_idx(&conn->request_array, 0);
+	for (i = 0; i < count; i++) {
+		request = requests[aqueue_idx(conn->request_queue, i)];
+		if (request->msgid == msgid) {
+			*idx_r = i;
+			return request;
+		}
+		if (request->msgid == -1)
+			break;
+	}
+	return NULL;
+}
+
+static bool
+db_ldap_handle_request_result(struct ldap_connection *conn,
+			      struct ldap_request *request, unsigned int idx,
+			      struct db_ldap_result *res)
+{
+	struct sieve_storage *storage = &conn->lstorage->storage;
+	int ret;
+	bool final_result;
+
+	i_assert(conn->pending_count > 0);
+
+	switch (ldap_msgtype(res->msg)) {
+	case LDAP_RES_SEARCH_ENTRY:
+	case LDAP_RES_SEARCH_RESULT:
+		break;
+	case LDAP_RES_SEARCH_REFERENCE:
+		/* we're going to ignore this */
+		return FALSE;
+	default:
+		e_error(storage->event, "db: Reply with unexpected type %d",
+			ldap_msgtype(res->msg));
+		return TRUE;
+	}
+
+	if (ldap_msgtype(res->msg) == LDAP_RES_SEARCH_ENTRY) {
+		ret = LDAP_SUCCESS;
+		final_result = FALSE;
+	} else {
+		final_result = TRUE;
+		ret = ldap_result2error(conn->ld, res->msg, 0);
+	}
+	if (ret != LDAP_SUCCESS) {
+		/* handle search failures here */
+		e_error(storage->event, "db: "
+			"ldap_search(base=%s filter=%s) failed: %s",
+			request->base, request->filter,
+			ldap_err2string(ret));
+		res = NULL;
+	} else {
+		if (!final_result && storage->svinst->debug) {
+			e_debug(storage->event,
+				"db: ldap_search(base=%s filter=%s) returned entry: %s",
+				request->base, request->filter,
+				ldap_get_dn(conn->ld, res->msg));
+		}
+	}
+	if (res == NULL && !final_result) {
+		/* wait for the final reply */
+		request->failed = TRUE;
+		return TRUE;
+	}
+	if (request->failed)
+		res = NULL;
+	if (final_result) {
+		conn->pending_count--;
+		aqueue_delete(conn->request_queue, idx);
+	}
+
+	T_BEGIN {
+		request->callback(conn, request, res == NULL ? NULL : res->msg);
+	} T_END;
+
+	if (idx > 0) {
+		/* see if there are timed out requests */
+		db_ldap_abort_requests(conn, idx,
+				       DB_LDAP_REQUEST_LOST_TIMEOUT_SECS,
+				       TRUE, "Request lost");
+	}
+	return TRUE;
+}
+
+static void db_ldap_result_unref(struct db_ldap_result **_res)
+{
+	struct db_ldap_result *res = *_res;
+
+	*_res = NULL;
+	i_assert(res->refcount > 0);
+	if (--res->refcount == 0) {
+		ldap_msgfree(res->msg);
+		i_free(res);
+	}
+}
+
+static void
+db_ldap_request_free(struct ldap_request *request)
+{
+	if (request->result != NULL)
+		db_ldap_result_unref(&request->result);
+}
+
+static void
+db_ldap_handle_result(struct ldap_connection *conn, struct db_ldap_result *res)
+{
+	struct sieve_storage *storage = &conn->lstorage->storage;
+	struct ldap_request *request;
+	unsigned int idx;
+	int msgid;
+
+	msgid = ldap_msgid(res->msg);
+	if (msgid == conn->default_bind_msgid) {
+		db_ldap_default_bind_finished(conn, res);
+		return;
+	}
+
+	request = db_ldap_find_request(conn, msgid, &idx);
+	if (request == NULL) {
+		e_error(storage->event,
+			"db: Reply with unknown msgid %d", msgid);
+		return;
+	}
+
+	if (db_ldap_handle_request_result(conn, request, idx, res))
+		db_ldap_request_free(request);
+}
+
+static void ldap_input(struct ldap_connection *conn)
+{
+	struct sieve_storage *storage = &conn->lstorage->storage;
+	struct timeval timeout;
+	struct db_ldap_result *res;
+	LDAPMessage *msg;
+	time_t prev_reply_diff;
+	int ret;
+
+	do {
+		if (conn->ld == NULL)
+			return;
+
+		i_zero(&timeout);
+		ret = ldap_result(conn->ld, LDAP_RES_ANY, 0, &timeout, &msg);
+#ifdef OPENLDAP_ASYNC_WORKAROUND
+		if (ret == 0) {
+			/* try again, there may be another in buffer */
+			ret = ldap_result(conn->ld, LDAP_RES_ANY, 0,
+					  &timeout, &msg);
+		}
+#endif
+		if (ret <= 0)
+			break;
+
+		res = i_new(struct db_ldap_result, 1);
+		res->refcount = 1;
+		res->msg = msg;
+		db_ldap_handle_result(conn, res);
+		db_ldap_result_unref(&res);
+	} while (conn->io != NULL);
+
+	prev_reply_diff = ioloop_time - conn->last_reply_stamp;
+	conn->last_reply_stamp = ioloop_time;
+
+	if (ret > 0) {
+		/* input disabled, continue once it's enabled */
+		i_assert(conn->io == NULL);
+	} else if (ret == 0) {
+		/* send more requests */
+		while (db_ldap_request_queue_next(conn))
+			;
+	} else if (ldap_get_errno(conn) != LDAP_SERVER_DOWN) {
+		e_error(storage->event, "db: ldap_result() failed: %s",
+			ldap_get_error(conn));
+		ldap_conn_reconnect(conn);
+	} else if (aqueue_count(conn->request_queue) > 0 ||
+		   prev_reply_diff < DB_LDAP_IDLE_RECONNECT_SECS) {
+		e_error(storage->event,
+			"db: Connection lost to LDAP server, reconnecting");
+		ldap_conn_reconnect(conn);
+	} else {
+		/* server probably disconnected an idle connection. don't
+		   reconnect until the next request comes. */
+		db_ldap_conn_close(conn);
+	}
+}
+
+#ifdef HAVE_LDAP_SASL
+static int
+sasl_interact(LDAP *ld ATTR_UNUSED, unsigned flags ATTR_UNUSED,
+	      void *defaults, void *interact)
+{
+	struct db_ldap_sasl_bind_context *context = defaults;
+	sasl_interact_t *in;
+	const char *str;
+
+	for (in = interact; in->id != SASL_CB_LIST_END; in++) {
+		switch (in->id) {
+		case SASL_CB_GETREALM:
+			str = context->realm;
+			break;
+		case SASL_CB_AUTHNAME:
+			str = context->authcid;
+			break;
+		case SASL_CB_USER:
+			str = context->authzid;
+			break;
+		case SASL_CB_PASS:
+			str = context->passwd;
+			break;
+		default:
+			str = NULL;
+			break;
+		}
+		if (str != NULL) {
+			in->len = strlen(str);
+			in->result = str;
+		}
+		
+	}
+	return LDAP_SUCCESS;
+}
+#endif
+
+static void ldap_connection_timeout(struct ldap_connection *conn)
+{
+	struct sieve_storage *storage = &conn->lstorage->storage;
+	i_assert(conn->conn_state == LDAP_CONN_STATE_BINDING);
+
+	e_error(storage->event, "db: Initial binding to LDAP server timed out");
+	db_ldap_conn_close(conn);
+}
+
+static int db_ldap_bind(struct ldap_connection *conn)
+{
+	const struct sieve_ldap_storage_settings *set = &conn->lstorage->set;
+	int msgid;
+
+	i_assert(conn->conn_state != LDAP_CONN_STATE_BINDING);
+	i_assert(conn->default_bind_msgid == -1);
+	i_assert(conn->pending_count == 0);
+
+	msgid = ldap_bind(conn->ld, set->dn, set->dnpass,
+			  LDAP_AUTH_SIMPLE);
+	if (msgid == -1) {
+		i_assert(ldap_get_errno(conn) != LDAP_SUCCESS);
+		if (db_ldap_connect_finish(conn, ldap_get_errno(conn)) < 0) {
+			/* lost connection, close it */
+			db_ldap_conn_close(conn);
+		}
+		return -1;
+	}
+
+	conn->conn_state = LDAP_CONN_STATE_BINDING;
+	conn->default_bind_msgid = msgid;
+
+	timeout_remove(&conn->to);
+	conn->to = timeout_add(DB_LDAP_REQUEST_LOST_TIMEOUT_SECS*1000,
+			       ldap_connection_timeout, conn);
+	return 0;
+}
+
+static int db_ldap_get_fd(struct ldap_connection *conn)
+{
+	struct sieve_storage *storage = &conn->lstorage->storage;
+	int ret;
+
+	/* get the connection's fd */
+	ret = ldap_get_option(conn->ld, LDAP_OPT_DESC, (void *)&conn->fd);
+	if (ret != LDAP_SUCCESS) {
+		e_error(storage->event, "db: Can't get connection fd: %s",
+			ldap_err2string(ret));
+		return -1;
+	}
+	if (conn->fd <= STDERR_FILENO) {
+		/* Solaris LDAP library seems to be broken */
+		e_error(storage->event,
+			"db: Buggy LDAP library returned wrong fd: %d",
+			conn->fd);
+		return -1;
+	}
+	i_assert(conn->fd != -1);
+	net_set_nonblock(conn->fd, TRUE);
+	return 0;
+}
+
+static int
+db_ldap_set_opt(struct ldap_connection *conn, int opt, const void *value,
+		const char *optname, const char *value_str)
+{
+	struct sieve_storage *storage = &conn->lstorage->storage;
+	int ret;
+
+	ret = ldap_set_option(conn->ld, opt, value);
+	if (ret != LDAP_SUCCESS) {
+		e_error(storage->event, "db: Can't set option %s to %s: %s",
+			optname, value_str, ldap_err2string(ret));
+		return -1;
+	}
+	return 0;
+}
+
+static int
+db_ldap_set_opt_str(struct ldap_connection *conn, int opt, const char *value,
+		    const char *optname)
+{
+	if (value != NULL)
+		return db_ldap_set_opt(conn, opt, value, optname, value);
+	return 0;
+}
+
+static int db_ldap_set_tls_options(struct ldap_connection *conn)
+{
+	const struct sieve_ldap_storage_settings *set = &conn->lstorage->set;
+
+	if (!set->tls)
+		return 0;
+
+#ifdef OPENLDAP_TLS_OPTIONS
+	if (db_ldap_set_opt_str(conn, LDAP_OPT_X_TLS_CACERTFILE,
+			    set->tls_ca_cert_file, "tls_ca_cert_file") < 0)
+		return -1;
+	if (db_ldap_set_opt_str(conn, LDAP_OPT_X_TLS_CACERTDIR,
+			    set->tls_ca_cert_dir, "tls_ca_cert_dir") < 0)
+		return -1;
+	if (db_ldap_set_opt_str(conn, LDAP_OPT_X_TLS_CERTFILE,
+			    set->tls_cert_file, "tls_cert_file") < 0)
+		return -1;
+	if (db_ldap_set_opt_str(conn, LDAP_OPT_X_TLS_KEYFILE,
+			    set->tls_key_file, "tls_key_file") < 0)
+		return -1;
+	if (db_ldap_set_opt_str(conn, LDAP_OPT_X_TLS_CIPHER_SUITE,
+			    set->tls_cipher_suite, "tls_cipher_suite") < 0)
+		return -1;
+	if (set->tls_require_cert != NULL) {
+		if (db_ldap_set_opt(conn, LDAP_OPT_X_TLS_REQUIRE_CERT,
+				&set->ldap_tls_require_cert,
+				"tls_require_cert", set->tls_require_cert) < 0)
+			return -1;
+	}
+#else
+	if (set->tls_ca_cert_file != NULL ||
+	    set->tls_ca_cert_dir != NULL ||
+	    set->tls_cert_file != NULL ||
+	    set->tls_key_file != NULL ||
+	    set->tls_cipher_suite != NULL) {
+		e_warning(&conn->lstorage->storage, "db: "
+			  "tls_* settings ignored, "
+			  "your LDAP library doesn't seem to support them");
+	}
+#endif
+	return 0;
+}
+
+static int db_ldap_set_options(struct ldap_connection *conn)
+{
+	const struct sieve_ldap_storage_settings *set = &conn->lstorage->set;
+	struct sieve_storage *storage = &conn->lstorage->storage;
+	unsigned int ldap_version;
+	int value;
+
+	if (db_ldap_set_opt(conn, LDAP_OPT_DEREF, &set->ldap_deref,
+			"deref", set->deref) < 0)
+		return -1;
+#ifdef LDAP_OPT_DEBUG_LEVEL
+	if (str_to_int(set->debug_level, &value) >= 0 && value != 0) {
+		if (db_ldap_set_opt(conn, LDAP_OPT_DEBUG_LEVEL, &value,
+				"debug_level", set->debug_level) < 0)
+			return -1;
+	}
+#endif
+
+	if (set->ldap_version < 3) {
+		if (set->sasl_bind) {
+			e_error(storage->event,
+				"db: sasl_bind=yes requires ldap_version=3");
+			return -1;
+		}
+		if (set->tls) {
+			e_error(storage->event,
+				"db: tls=yes requires ldap_version=3");
+			return -1;
+		}
+	}
+
+	ldap_version = set->ldap_version;
+	if (db_ldap_set_opt(conn, LDAP_OPT_PROTOCOL_VERSION, &ldap_version,
+			"protocol_version", dec2str(ldap_version)) < 0)
+		return -1;
+	if (db_ldap_set_tls_options(conn) < 0)
+		return -1;
+	return 0;
+}
+
+int sieve_ldap_db_connect(struct ldap_connection *conn)
+{
+	const struct sieve_ldap_storage_settings *set = &conn->lstorage->set;
+	struct sieve_storage *storage = &conn->lstorage->storage;
+	struct timeval start, end;
+	int debug_level;
+	bool debug;
+#if defined(HAVE_LDAP_SASL) || defined(LDAP_HAVE_START_TLS_S)
+	int ret;
+#endif
+
+	if (conn->conn_state != LDAP_CONN_STATE_DISCONNECTED)
+		return 0;
+
+	debug = FALSE;
+	if (str_to_int(set->debug_level, &debug_level) >= 0)
+		debug = debug_level > 0;
+
+	if (debug)
+		i_gettimeofday(&start);
+	i_assert(conn->pending_count == 0);
+	if (conn->ld == NULL) {
+		if (set->uris != NULL) {
+#ifdef LDAP_HAVE_INITIALIZE
+			if (ldap_initialize(&conn->ld, set->uris) != LDAP_SUCCESS)
+				conn->ld = NULL;
+#else
+			e_error(storage->event, "db: "
+				"Your LDAP library doesn't support "
+				"'uris' setting, use 'hosts' instead.");
+			return -1;
+#endif
+		} else
+			conn->ld = ldap_init(set->hosts, LDAP_PORT);
+
+		if (conn->ld == NULL) {
+			e_error(storage->event, "db: "
+				"ldap_init() failed with hosts: %s",	set->hosts);
+			return -1;
+		}
+
+		if (db_ldap_set_options(conn) < 0)
+			return -1;
+	}
+
+	if (set->tls) {
+#ifdef LDAP_HAVE_START_TLS_S
+		ret = ldap_start_tls_s(conn->ld, NULL, NULL);
+		if (ret != LDAP_SUCCESS) {
+			if (ret == LDAP_OPERATIONS_ERROR &&
+			    set->uris != NULL &&
+			    str_begins(set->uris, "ldaps:")) {
+				e_error(storage->event, "db: "
+					"Don't use both tls=yes and ldaps URI");
+			}
+			e_error(storage->event, "db: "
+				"ldap_start_tls_s() failed: %s",
+				ldap_err2string(ret));
+			return -1;
+		}
+#else
+		e_error(storage->event, "db: "
+			"Your LDAP library doesn't support TLS");
+		return -1;
+#endif
+	}
+
+	if (set->sasl_bind) {
+#ifdef HAVE_LDAP_SASL
+		struct db_ldap_sasl_bind_context context;
+
+		i_zero(&context);
+		context.authcid = set->dn;
+		context.passwd = set->dnpass;
+		context.realm = set->sasl_realm;
+		context.authzid = set->sasl_authz_id;
+
+		/* There doesn't seem to be a way to do SASL binding
+		   asynchronously.. */
+		ret = ldap_sasl_interactive_bind_s(conn->ld, NULL,
+						   set->sasl_mech,
+						   NULL, NULL, LDAP_SASL_QUIET,
+						   sasl_interact, &context);
+		if (db_ldap_connect_finish(conn, ret) < 0)
+			return -1;
+#else
+		e_error(storage->event, "db: "
+			"sasl_bind=yes but no SASL support compiled in");
+		return -1;
+#endif
+		conn->conn_state = LDAP_CONN_STATE_BOUND;
+	} else {
+		if (db_ldap_bind(conn) < 0)
+			return -1;
+	}
+	if (debug) {
+		i_gettimeofday(&end);
+		int msecs = timeval_diff_msecs(&end, &start);
+		e_debug(storage->event, "db: "
+			"Initialization took %d msecs", msecs);
+	}
+
+	if (db_ldap_get_fd(conn) < 0)
+		return -1;
+	conn->io = io_add(conn->fd, IO_READ, ldap_input, conn);
+	return 0;
+}
+
+void db_ldap_enable_input(struct ldap_connection *conn, bool enable)
+{
+	if (!enable) {
+		io_remove(&conn->io);
+	} else {
+		if (conn->io == NULL && conn->fd != -1) {
+			conn->io = io_add(conn->fd, IO_READ, ldap_input, conn);
+			ldap_input(conn);
+		}
+	}
+}
+
+static void db_ldap_disconnect_timeout(struct ldap_connection *conn)
+{
+	db_ldap_abort_requests(conn, UINT_MAX,
+		DB_LDAP_REQUEST_DISCONNECT_TIMEOUT_SECS, FALSE,
+		"Aborting (timeout), we're not connected to LDAP server");
+
+	if (aqueue_count(conn->request_queue) == 0) {
+		/* no requests left, remove this timeout handler */
+		timeout_remove(&conn->to);
+	}
+}
+
+static void db_ldap_conn_close(struct ldap_connection *conn)
+{
+	struct ldap_request *const *requests, *request;
+	unsigned int i;
+
+	conn->conn_state = LDAP_CONN_STATE_DISCONNECTED;
+	conn->default_bind_msgid = -1;
+
+	timeout_remove(&conn->to);
+
+	if (conn->pending_count != 0) {
+		requests = array_idx(&conn->request_array, 0);
+		for (i = 0; i < conn->pending_count; i++) {
+			request = requests[aqueue_idx(conn->request_queue, i)];
+
+			i_assert(request->msgid != -1);
+			request->msgid = -1;
+		}
+		conn->pending_count = 0;
+	}
+
+	if (conn->ld != NULL) {
+		ldap_unbind(conn->ld);
+		conn->ld = NULL;
+	}
+	conn->fd = -1;
+
+	/* the fd may have already been closed before ldap_unbind(),
+	   so we'll have to use io_remove_closed(). */
+	io_remove_closed(&conn->io);
+
+	if (aqueue_count(conn->request_queue) > 0) {
+		conn->to = timeout_add(DB_LDAP_REQUEST_DISCONNECT_TIMEOUT_SECS *
+				       1000/2, db_ldap_disconnect_timeout, conn);
+	}
+}
+
+struct ldap_field_find_context {
+	ARRAY_TYPE(string) attr_names;
+	pool_t pool;
+};
+
+#define IS_LDAP_ESCAPED_CHAR(c) \
+	((c) == '*' || (c) == '(' || (c) == ')' || (c) == '\\')
+
+const char *ldap_escape(const char *str)
+{
+	const char *p;
+	string_t *ret;
+
+	for (p = str; *p != '\0'; p++) {
+		if (IS_LDAP_ESCAPED_CHAR(*p))
+			break;
+	}
+
+	if (*p == '\0')
+		return str;
+
+	ret = t_str_new((size_t) (p - str) + 64);
+	str_append_data(ret, str, (size_t) (p - str));
+
+	for (; *p != '\0'; p++) {
+		if (IS_LDAP_ESCAPED_CHAR(*p))
+			str_append_c(ret, '\\');
+		str_append_c(ret, *p);
+	}
+	return str_c(ret);
+}
+
+struct ldap_connection *
+sieve_ldap_db_init(struct sieve_ldap_storage *lstorage)
+{
+	struct ldap_connection *conn;
+	pool_t pool;
+
+	pool = pool_alloconly_create("ldap_connection", 1024);
+	conn = p_new(pool, struct ldap_connection, 1);
+	conn->pool = pool;
+	conn->refcount = 1;
+	conn->lstorage = lstorage;
+
+	conn->conn_state = LDAP_CONN_STATE_DISCONNECTED;
+	conn->default_bind_msgid = -1;
+	conn->fd = -1;
+
+	i_array_init(&conn->request_array, 512);
+	conn->request_queue = aqueue_init(&conn->request_array.arr);
+
+	conn->next = ldap_connections;
+	ldap_connections = conn;
+	return conn;
+}
+
+void sieve_ldap_db_unref(struct ldap_connection **_conn)
+{
+	struct ldap_connection *conn = *_conn;
+	struct ldap_connection **p;
+
+	*_conn = NULL;
+	i_assert(conn->refcount >= 0);
+	if (--conn->refcount > 0)
+		return;
+
+	for (p = &ldap_connections; *p != NULL; p = &(*p)->next) {
+		if (*p == conn) {
+			*p = conn->next;
+			break;
+		}
+	}
+
+	db_ldap_abort_requests(conn, UINT_MAX, 0, FALSE, "Shutting down");
+	i_assert(conn->pending_count == 0);
+	db_ldap_conn_close(conn);
+	i_assert(conn->to == NULL);
+
+	array_free(&conn->request_array);
+	aqueue_deinit(&conn->request_queue);
+
+	pool_unref(&conn->pool);
+}
+
+static void db_ldap_switch_ioloop(struct ldap_connection *conn)
+{
+	if (conn->to != NULL)
+		conn->to = io_loop_move_timeout(&conn->to);
+	if (conn->io != NULL)
+		conn->io = io_loop_move_io(&conn->io);
+}
+
+static void db_ldap_wait(struct ldap_connection *conn)
+{
+	struct sieve_storage *storage = &conn->lstorage->storage;
+	struct ioloop *prev_ioloop = current_ioloop;
+
+	i_assert(conn->ioloop == NULL);
+
+	if (aqueue_count(conn->request_queue) == 0)
+		return;
+
+	conn->ioloop = io_loop_create();
+	db_ldap_switch_ioloop(conn);
+	/* either we're waiting for network I/O or we're getting out of a
+	   callback using timeout_add_short(0) */
+	i_assert(io_loop_have_ios(conn->ioloop) ||
+		 io_loop_have_immediate_timeouts(conn->ioloop));
+
+	do {
+		e_debug(storage->event, "db: "
+			"Waiting for %d requests to finish",
+			aqueue_count(conn->request_queue) );
+		io_loop_run(conn->ioloop);
+	} while (aqueue_count(conn->request_queue) > 0);
+
+	e_debug(storage->event, "db: All requests finished");
+
+	current_ioloop = prev_ioloop;
+	db_ldap_switch_ioloop(conn);
+	current_ioloop = conn->ioloop;
+	io_loop_destroy(&conn->ioloop);
+}
+
+static void sieve_ldap_db_script_free(unsigned char *script)
+{
+	i_free(script);
+}
+
+static int
+sieve_ldap_db_get_script_modattr(struct ldap_connection *conn,
+	LDAPMessage *entry, pool_t pool, const char **modattr_r)
+{
+	const struct sieve_ldap_storage_settings *set = &conn->lstorage->set;
+	struct sieve_storage *storage = &conn->lstorage->storage;
+	char *attr, **vals;
+	BerElement *ber;
+
+	*modattr_r = NULL;
+
+	attr = ldap_first_attribute(conn->ld, entry, &ber);
+	while (attr != NULL) {
+		if (strcmp(attr, set->sieve_ldap_mod_attr) == 0) {
+			vals = ldap_get_values(conn->ld, entry, attr);
+			if (vals == NULL || vals[0] == NULL)
+				return 0;
+
+			if (vals[1] != NULL) {
+				e_warning(storage->event, "db: "
+					  "Search returned more than one Sieve modified attribute `%s'; "
+					  "using only the first one.", set->sieve_ldap_mod_attr);
+			} 
+
+			*modattr_r = p_strdup(pool, vals[0]);
+		
+			ldap_value_free(vals);
+			ldap_memfree(attr);
+			return 1;
+		}
+		ldap_memfree(attr);
+		attr = ldap_next_attribute(conn->ld, entry, ber);
+	}
+	ber_free(ber, 0);
+
+	return 0;
+}
+
+static int
+sieve_ldap_db_get_script(struct ldap_connection *conn,
+	LDAPMessage *entry, struct istream **script_r)
+{
+	const struct sieve_ldap_storage_settings *set = &conn->lstorage->set;
+	struct sieve_storage *storage = &conn->lstorage->storage;
+	char *attr;
+	unsigned char *data;
+	size_t size;
+	struct berval **vals;
+	BerElement *ber;
+
+	attr = ldap_first_attribute(conn->ld, entry, &ber);
+	while (attr != NULL) {
+		if (strcmp(attr, set->sieve_ldap_script_attr) == 0) {
+			vals = ldap_get_values_len(conn->ld, entry, attr);
+			if (vals == NULL || vals[0] == NULL)
+				return 0;
+
+			if (vals[1] != NULL) {
+				e_warning(storage->event, "db: "
+					  "Search returned more than one Sieve script attribute `%s'; "
+					  "using only the first one.", set->sieve_ldap_script_attr);
+			} 
+
+			size = vals[0]->bv_len;
+			data = i_malloc(size);
+
+			e_debug(storage->event, "db: "
+				"Found script with length %zu", size);
+
+			memcpy(data, vals[0]->bv_val, size);
+		
+			ldap_value_free_len(vals);
+			ldap_memfree(attr);
+
+			*script_r = i_stream_create_from_data(data, size);
+			i_stream_add_destroy_callback
+				(*script_r,	sieve_ldap_db_script_free, data);
+			return 1;
+		}
+		ldap_memfree(attr);
+		attr = ldap_next_attribute(conn->ld, entry, ber);
+	}
+	ber_free(ber, 0);
+
+	return 0;
+}
+
+const struct var_expand_table
+auth_request_var_expand_static_tab[] = {
+	{ 'u', NULL, "user" },
+	{ 'n', NULL, "username" },
+	{ 'd', NULL, "domain" },
+	{ 'h', NULL, "home" },
+	{ '\0', NULL, "name" },
+	{ '\0', NULL, NULL }
+};
+
+static const struct var_expand_table *
+db_ldap_get_var_expand_table(struct ldap_connection *conn,
+	const char *name)
+{
+	struct sieve_ldap_storage *lstorage = conn->lstorage;
+	struct sieve_instance *svinst = lstorage->storage.svinst;
+	const unsigned int auth_count =
+		N_ELEMENTS(auth_request_var_expand_static_tab);
+	struct var_expand_table *tab;
+
+	/* keep the extra fields at the beginning. the last static_tab field
+	   contains the ending NULL-fields. */
+	tab = t_malloc_no0((auth_count) * sizeof(*tab));
+
+	memcpy(tab, auth_request_var_expand_static_tab,
+	       auth_count * sizeof(*tab));
+
+	tab[0].value = ldap_escape(lstorage->username);
+	tab[1].value = ldap_escape(t_strcut(lstorage->username, '@'));
+	tab[2].value = strchr(lstorage->username, '@');
+	if (tab[2].value != NULL)
+		tab[2].value = ldap_escape(tab[2].value+1);
+	tab[3].value = ldap_escape(svinst->home_dir);
+	tab[4].value = ldap_escape(name);
+	return tab;
+}
+
+struct sieve_ldap_script_lookup_request {
+	struct ldap_request request;
+
+	unsigned int entries;
+	const char *result_dn;
+	const char *result_modattr;
+};
+
+static void
+sieve_ldap_lookup_script_callback(struct ldap_connection *conn,
+			  struct ldap_request *request, LDAPMessage *res)
+{
+	struct sieve_storage *storage = &conn->lstorage->storage;
+	struct sieve_ldap_script_lookup_request *srequest =
+		(struct sieve_ldap_script_lookup_request *)request;
+
+	if (res == NULL) {
+		io_loop_stop(conn->ioloop);
+		return;
+	}
+
+	if (ldap_msgtype(res) != LDAP_RES_SEARCH_RESULT) {
+		if (srequest->result_dn == NULL) {
+			srequest->result_dn = p_strdup
+				(request->pool, ldap_get_dn(conn->ld, res));
+			(void)sieve_ldap_db_get_script_modattr
+				(conn, res, request->pool, &srequest->result_modattr);
+		} else if (srequest->entries++ == 0) {
+			e_warning(storage->event, "db: "
+				  "Search returned more than one entry for Sieve script; "
+				  "using only the first one.");
+		}
+	} else {
+		io_loop_stop(conn->ioloop);
+		return;
+	}
+}
+
+int sieve_ldap_db_lookup_script(struct ldap_connection *conn,
+	const char *name, const char **dn_r, const char **modattr_r)
+{
+	struct sieve_ldap_storage *lstorage = conn->lstorage;
+	struct sieve_storage *storage = &lstorage->storage;
+	const struct sieve_ldap_storage_settings *set = &lstorage->set;
+	struct sieve_ldap_script_lookup_request *request;
+	const struct var_expand_table *tab;
+	char **attr_names;
+	const char *error;
+	string_t *str;
+
+	pool_t pool = pool_alloconly_create
+		("sieve_ldap_script_lookup_request", 512);
+	request = p_new(pool, struct sieve_ldap_script_lookup_request, 1);
+	request->request.pool = pool;
+
+	tab = db_ldap_get_var_expand_table(conn, name);
+
+	str = t_str_new(512);
+	if (var_expand(str, set->base, tab, &error) <= 0) {
+		e_error(storage->event, "db: "
+			"Failed to expand base=%s: %s",
+			set->base, error);
+		return -1;
+	}
+	request->request.base = p_strdup(pool, str_c(str));
+
+	attr_names = p_new(pool, char *, 3);
+	attr_names[0] = p_strdup(pool, set->sieve_ldap_mod_attr);
+
+	str_truncate(str, 0);
+	if (var_expand(str, set->sieve_ldap_filter, tab, &error) <= 0) {
+		e_error(storage->event, "db: "
+			"Failed to expand sieve_ldap_filter=%s: %s",
+			set->sieve_ldap_filter, error);
+		return -1;
+	}
+
+	request->request.scope = lstorage->set.ldap_scope;
+	request->request.filter = p_strdup(pool, str_c(str));
+	request->request.attributes = attr_names;
+
+	e_debug(storage->event, "base=%s scope=%s filter=%s fields=%s",
+		request->request.base, lstorage->set.scope,
+		request->request.filter,
+		t_strarray_join((const char **)attr_names, ","));
+
+	request->request.callback = sieve_ldap_lookup_script_callback;
+	db_ldap_request(conn, &request->request);
+	db_ldap_wait(conn);
+
+	*dn_r = t_strdup(request->result_dn);
+	*modattr_r = t_strdup(request->result_modattr);
+	pool_unref(&request->request.pool);
+	return (*dn_r == NULL ? 0 : 1);
+}
+
+struct sieve_ldap_script_read_request {
+	struct ldap_request request;
+
+	unsigned int entries;
+	struct istream *result;
+};
+
+static void
+sieve_ldap_read_script_callback(struct ldap_connection *conn,
+			  struct ldap_request *request, LDAPMessage *res)
+{
+	struct sieve_storage *storage = &conn->lstorage->storage;
+	struct sieve_ldap_script_read_request *srequest =
+		(struct sieve_ldap_script_read_request *)request;
+
+	if (res == NULL) {
+		io_loop_stop(conn->ioloop);
+		return;
+	}
+
+	if (ldap_msgtype(res) != LDAP_RES_SEARCH_RESULT) {
+
+		if (srequest->result == NULL) {
+			(void)sieve_ldap_db_get_script(conn, res, &srequest->result);
+		} else {
+			e_error(storage->event, "db: "
+				"Search returned more than one entry for Sieve script DN");
+			i_stream_unref(&srequest->result);
+		}
+
+	} else {
+		io_loop_stop(conn->ioloop);
+		return;
+	}
+}
+
+int sieve_ldap_db_read_script(struct ldap_connection *conn,
+	const char *dn, struct istream **script_r)
+{
+	struct sieve_ldap_storage *lstorage = conn->lstorage;
+	struct sieve_storage *storage = &lstorage->storage;
+	const struct sieve_ldap_storage_settings *set = &lstorage->set;
+	struct sieve_ldap_script_read_request *request;
+	char **attr_names;
+
+	pool_t pool = pool_alloconly_create
+		("sieve_ldap_script_read_request", 512);
+	request = p_new(pool, struct sieve_ldap_script_read_request, 1);
+	request->request.pool = pool;
+	request->request.base = p_strdup(pool, dn);
+
+	attr_names = p_new(pool, char *, 3);
+	attr_names[0] = p_strdup(pool, set->sieve_ldap_script_attr);
+
+	request->request.scope = LDAP_SCOPE_BASE;
+	request->request.filter = "(objectClass=*)";
+	request->request.attributes = attr_names;
+
+	e_debug(storage->event, "base=%s scope=base filter=%s fields=%s",
+		request->request.base, request->request.filter,
+		t_strarray_join((const char **)attr_names, ","));
+
+	request->request.callback = sieve_ldap_read_script_callback;
+	db_ldap_request(conn, &request->request);
+	db_ldap_wait(conn);
+
+	*script_r = request->result;
+	pool_unref(&request->request.pool);
+	return (*script_r == NULL ? 0 : 1);
+}
+
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/storage/ldap/sieve-ldap-db.h b/pigeonhole/src/lib-sieve/storage/ldap/sieve-ldap-db.h
new file mode 100644
index 0000000..d213026
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/ldap/sieve-ldap-db.h
@@ -0,0 +1,140 @@
+#ifndef DB_LDAP_H
+#define DB_LDAP_H
+
+/* Functions like ldap_bind() have been deprecated in OpenLDAP 2.3
+   This define enables them until the code here can be refactored */
+#define LDAP_DEPRECATED 1
+
+/* Maximum number of pending requests before delaying new requests. */
+#define DB_LDAP_MAX_PENDING_REQUESTS 8
+/* If LDAP connection is down, fail requests after waiting for this long. */
+#define DB_LDAP_REQUEST_DISCONNECT_TIMEOUT_SECS 4
+/* If request is still in queue after this many seconds and other requests
+   have been replied, assume the request was lost and abort it. */
+#define DB_LDAP_REQUEST_LOST_TIMEOUT_SECS 60
+/* If server disconnects us, don't reconnect if no requests have been sent
+   for this many seconds. */
+#define DB_LDAP_IDLE_RECONNECT_SECS 60
+
+#include <ldap.h>
+
+#define HAVE_LDAP_SASL
+#ifdef HAVE_SASL_SASL_H
+#  include <sasl/sasl.h>
+#elif defined (HAVE_SASL_H)
+#  include <sasl.h>
+#else
+#  undef HAVE_LDAP_SASL
+#endif
+#ifdef LDAP_OPT_X_TLS
+#  define OPENLDAP_TLS_OPTIONS
+#endif
+#if !defined(SASL_VERSION_MAJOR) || SASL_VERSION_MAJOR < 2
+#  undef HAVE_LDAP_SASL
+#endif
+
+#ifndef LDAP_SASL_QUIET
+#  define LDAP_SASL_QUIET 0 /* Doesn't exist in Solaris LDAP */
+#endif
+
+/* Older versions may require calling ldap_result() twice */
+#if LDAP_VENDOR_VERSION <= 20112
+#  define OPENLDAP_ASYNC_WORKAROUND
+#endif
+
+/* Solaris LDAP library doesn't have LDAP_OPT_SUCCESS */
+#ifndef LDAP_OPT_SUCCESS
+#  define LDAP_OPT_SUCCESS LDAP_SUCCESS
+#endif
+
+struct ldap_connection;
+struct ldap_request;
+
+typedef void db_search_callback_t(struct ldap_connection *conn,
+				  struct ldap_request *request,
+				  LDAPMessage *res);
+struct ldap_request {
+	pool_t pool;
+
+	/* msgid for sent requests, -1 if not sent */
+	int msgid;
+	/* timestamp when request was created */
+	time_t create_time;
+
+	bool failed;
+
+	db_search_callback_t *callback;
+
+	const char *base;
+	const char *filter;
+	int scope;
+	char **attributes;
+
+	struct db_ldap_result *result;
+};
+
+enum ldap_connection_state {
+	/* Not connected */
+	LDAP_CONN_STATE_DISCONNECTED,
+	/* Binding - either to default dn or doing auth bind */
+	LDAP_CONN_STATE_BINDING,
+	/* Bound */
+	LDAP_CONN_STATE_BOUND
+};
+
+struct ldap_connection {
+	struct ldap_connection *next;
+
+	struct sieve_ldap_storage *lstorage;
+
+	pool_t pool;
+	int refcount;
+
+	LDAP *ld;
+	enum ldap_connection_state conn_state;
+	int default_bind_msgid;
+
+	int fd;
+	struct io *io;
+	struct timeout *to;
+	struct ioloop *ioloop;
+
+	/* Request queue contains sent requests at tail (msgid != -1) and
+	   queued requests at head (msgid == -1). */
+	struct aqueue *request_queue;
+	ARRAY(struct ldap_request *) request_array;
+	/* Number of messages in queue with msgid != -1 */
+	unsigned int pending_count;
+
+	/* Timestamp when we last received a reply */
+	time_t last_reply_stamp;
+};
+
+
+int ldap_deref_from_str(const char *str, int *deref_r);
+int ldap_scope_from_str(const char *str, int *scope_r);
+#ifdef OPENLDAP_TLS_OPTIONS
+int ldap_tls_require_cert_from_str(const char *str, int *opt_x_tls_r);
+#endif
+
+/* Send/queue request */
+void db_ldap_request(struct ldap_connection *conn,
+		     struct ldap_request *request);
+
+void db_ldap_enable_input(struct ldap_connection *conn, bool enable);
+
+const char *ldap_escape(const char *str);
+const char *ldap_get_error(struct ldap_connection *conn);
+
+int sieve_ldap_db_connect(struct ldap_connection *conn);
+
+struct ldap_connection *
+sieve_ldap_db_init(struct sieve_ldap_storage *lstorage);
+void sieve_ldap_db_unref(struct ldap_connection **conn);
+
+int sieve_ldap_db_lookup_script(struct ldap_connection *conn,
+	const char *name, const char **dn_r, const char **modattr_r);
+int sieve_ldap_db_read_script(struct ldap_connection *conn,
+	const char *dn, struct istream **script_r);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/storage/ldap/sieve-ldap-script.c b/pigeonhole/src/lib-sieve/storage/ldap/sieve-ldap-script.c
new file mode 100644
index 0000000..1c732db
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/ldap/sieve-ldap-script.c
@@ -0,0 +1,369 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "time-util.h"
+#include "istream.h"
+
+#include "sieve-ldap-storage.h"
+
+#if defined(SIEVE_BUILTIN_LDAP) || defined(PLUGIN_BUILD)
+
+#include "str.h"
+#include "strfuncs.h"
+
+#include "sieve-error.h"
+#include "sieve-dump.h"
+#include "sieve-binary.h"
+
+/*
+ * Script file implementation
+ */
+
+static struct sieve_ldap_script *sieve_ldap_script_alloc(void)
+{
+	struct sieve_ldap_script *lscript;
+	pool_t pool;
+
+	pool = pool_alloconly_create("sieve_ldap_script", 1024);
+	lscript = p_new(pool, struct sieve_ldap_script, 1);
+	lscript->script = sieve_ldap_script;
+	lscript->script.pool = pool;
+
+	return lscript;
+}
+
+struct sieve_ldap_script *sieve_ldap_script_init
+(struct sieve_ldap_storage *lstorage, const char *name)
+{
+	struct sieve_storage *storage = &lstorage->storage;
+	struct sieve_ldap_script *lscript = NULL;
+	const char *location;
+
+	if ( name == NULL ) {
+		name = SIEVE_LDAP_SCRIPT_DEFAULT;
+		location = storage->location;
+	} else {
+		location = t_strconcat
+			(storage->location, ";name=", name, NULL);
+	}
+
+	lscript = sieve_ldap_script_alloc();
+	sieve_script_init(&lscript->script,
+		storage, &sieve_ldap_script, location, name);
+	return lscript;
+}
+
+static int sieve_ldap_script_open
+(struct sieve_script *script, enum sieve_error *error_r)
+{
+	struct sieve_ldap_script *lscript =
+		(struct sieve_ldap_script *)script;
+	struct sieve_storage *storage = script->storage;
+	struct sieve_ldap_storage *lstorage =
+		(struct sieve_ldap_storage *)storage;
+	int ret;
+
+	if ( sieve_ldap_db_connect(lstorage->conn) < 0 ) {
+		sieve_storage_set_critical(storage,
+			"Failed to connect to LDAP database");
+		*error_r = storage->error_code;
+		return -1;
+	}
+
+	if ( (ret=sieve_ldap_db_lookup_script(lstorage->conn,
+		script->name, &lscript->dn, &lscript->modattr)) <= 0 ) {
+		if ( ret == 0 ) {
+			e_debug(script->event, "Script entry not found");
+			sieve_script_set_error(script,
+				SIEVE_ERROR_NOT_FOUND,
+				"Sieve script not found");
+		} else {
+			sieve_script_set_internal_error(script);
+		}
+		*error_r = script->storage->error_code;
+		return -1;
+	}
+
+	return 0;
+}
+
+static int sieve_ldap_script_get_stream
+(struct sieve_script *script, struct istream **stream_r,
+	enum sieve_error *error_r)
+{	
+	struct sieve_ldap_script *lscript =
+		(struct sieve_ldap_script *)script;
+	struct sieve_storage *storage = script->storage;
+	struct sieve_ldap_storage *lstorage =
+		(struct sieve_ldap_storage *)storage;
+	int ret;
+
+	i_assert(lscript->dn != NULL);
+
+	if ( (ret=sieve_ldap_db_read_script(
+		lstorage->conn, lscript->dn, stream_r)) <= 0 ) {
+		if ( ret == 0 ) {
+			e_debug(script->event, "Script attribute not found");
+			sieve_script_set_error(script,
+				SIEVE_ERROR_NOT_FOUND,
+				"Sieve script not found");
+		} else {
+			sieve_script_set_internal_error(script);
+		}
+		*error_r = script->storage->error_code;
+		return -1;
+	}
+	return 0;
+}
+
+static int sieve_ldap_script_binary_read_metadata
+(struct sieve_script *script, struct sieve_binary_block *sblock,
+	sieve_size_t *offset)
+{
+	struct sieve_ldap_script *lscript =
+		(struct sieve_ldap_script *)script;
+	struct sieve_instance *svinst = script->storage->svinst;
+	struct sieve_ldap_storage *lstorage =
+		(struct sieve_ldap_storage *)script->storage;		
+	struct sieve_binary *sbin =
+		sieve_binary_block_get_binary(sblock);
+	time_t bmtime = sieve_binary_mtime(sbin);
+	string_t *dn, *modattr;
+
+	/* config file changed? */
+	if ( bmtime <= lstorage->set_mtime ) {
+		if ( svinst->debug ) {
+			e_debug(script->event,
+				"Sieve binary `%s' is not newer "
+				"than the LDAP configuration `%s' (%s <= %s)",
+				sieve_binary_path(sbin), lstorage->config_file,
+				t_strflocaltime("%Y-%m-%d %H:%M:%S", bmtime),
+				t_strflocaltime("%Y-%m-%d %H:%M:%S", lstorage->set_mtime));
+		}
+		return 0;
+	}
+
+	/* open script if not open already */
+	if ( lscript->dn == NULL &&
+		sieve_script_open(script, NULL) < 0 )
+		return 0;
+
+	/* if modattr not found, recompile always */
+	if ( lscript->modattr == NULL || *lscript->modattr == '\0' ) {
+		e_error(script->event,
+			"LDAP entry for script `%s' "
+			"has no modified attribute `%s'",
+			sieve_script_location(script),
+			lstorage->set.sieve_ldap_mod_attr);
+		return 0;
+	}
+
+	/* compare DN in binary and from search result */
+	if ( !sieve_binary_read_string(sblock, offset, &dn) ) {
+		e_error(script->event,
+			"Binary `%s' has invalid metadata for script `%s': "
+			"Invalid DN",
+			sieve_binary_path(sbin), sieve_script_location(script));
+		return -1;
+	}
+	i_assert( lscript->dn != NULL );
+	if ( strcmp(str_c(dn), lscript->dn) != 0 ) {
+		e_debug(script->event,
+			"Binary `%s' reports different LDAP DN for script `%s' "
+			"(`%s' rather than `%s')",
+			sieve_binary_path(sbin), sieve_script_location(script),
+			str_c(dn), lscript->dn);
+		return 0;
+	}
+
+	/* compare modattr in binary and from search result */
+	if ( !sieve_binary_read_string(sblock, offset, &modattr) ) {
+		e_error(script->event,
+			"Binary `%s' has invalid metadata for script `%s': "
+			"Invalid modified attribute",
+			sieve_binary_path(sbin), sieve_script_location(script));
+		return -1;
+	}
+	if ( strcmp(str_c(modattr), lscript->modattr) != 0 ) {
+		e_debug(script->event,
+			"Binary `%s' reports different modified attribute content "
+			"for script `%s' (`%s' rather than `%s')",
+			sieve_binary_path(sbin), sieve_script_location(script),
+			str_c(modattr), lscript->modattr);
+		return 0;
+	}
+	return 1;
+}
+
+static void sieve_ldap_script_binary_write_metadata
+(struct sieve_script *script, struct sieve_binary_block *sblock)
+{
+	struct sieve_ldap_script *lscript =
+		(struct sieve_ldap_script *)script;
+
+	sieve_binary_emit_cstring(sblock, lscript->dn);
+	if (lscript->modattr == NULL)
+		sieve_binary_emit_cstring(sblock, "");
+	else
+		sieve_binary_emit_cstring(sblock, lscript->modattr);
+}
+
+static bool sieve_ldap_script_binary_dump_metadata
+(struct sieve_script *script ATTR_UNUSED, struct sieve_dumptime_env *denv,
+	struct sieve_binary_block *sblock, sieve_size_t *offset)
+{
+	string_t *dn, *modattr;
+
+	if ( !sieve_binary_read_string(sblock, offset, &dn) )
+		return FALSE;
+	sieve_binary_dumpf(denv, "ldap.dn = %s\n", str_c(dn));
+
+	if ( !sieve_binary_read_string(sblock, offset, &modattr) )
+		return FALSE;
+	sieve_binary_dumpf(denv, "ldap.mod_attr = %s\n", str_c(modattr));
+
+	return TRUE;
+}
+
+static const char *sieve_ldap_script_get_binpath
+(struct sieve_ldap_script *lscript)
+{
+	struct sieve_script *script = &lscript->script;
+	struct sieve_storage *storage = script->storage;
+
+	if ( lscript->binpath == NULL ) {
+		if ( storage->bin_dir == NULL )
+			return NULL;
+		lscript->binpath = p_strconcat(script->pool,
+			storage->bin_dir, "/",
+			sieve_binfile_from_name(script->name), NULL);
+	}
+
+	return lscript->binpath;
+}
+
+static struct sieve_binary *sieve_ldap_script_binary_load
+(struct sieve_script *script, enum sieve_error *error_r)
+{
+	struct sieve_storage *storage = script->storage;
+	struct sieve_ldap_script *lscript =
+		(struct sieve_ldap_script *)script;
+
+	if ( sieve_ldap_script_get_binpath(lscript) == NULL )
+		return NULL;
+
+	return sieve_binary_open(storage->svinst,
+		lscript->binpath, script, error_r);
+}
+
+static int sieve_ldap_script_binary_save
+(struct sieve_script *script, struct sieve_binary *sbin, bool update,
+	enum sieve_error *error_r)
+{
+	struct sieve_ldap_script *lscript =
+		(struct sieve_ldap_script *)script;
+
+	if ( sieve_ldap_script_get_binpath(lscript) == NULL )
+		return 0;
+
+	if ( sieve_storage_setup_bindir(script->storage, 0700) < 0 )
+		return -1;
+
+	return sieve_binary_save
+		(sbin, lscript->binpath, update, 0600, error_r);
+}
+
+static bool sieve_ldap_script_equals
+(const struct sieve_script *script, const struct sieve_script *other)
+{
+	struct sieve_storage *storage = script->storage;
+	struct sieve_storage *sother = other->storage;
+
+	if ( strcmp(storage->location, sother->location) != 0 )
+		return FALSE;
+
+	i_assert( script->name != NULL && other->name != NULL );
+
+	return ( strcmp(script->name, other->name) == 0 );
+}
+
+const struct sieve_script sieve_ldap_script = {
+	.driver_name = SIEVE_LDAP_STORAGE_DRIVER_NAME,
+	.v = {
+		.open = sieve_ldap_script_open,
+
+		.get_stream = sieve_ldap_script_get_stream,
+
+		.binary_read_metadata = sieve_ldap_script_binary_read_metadata,
+		.binary_write_metadata = sieve_ldap_script_binary_write_metadata,
+		.binary_dump_metadata = sieve_ldap_script_binary_dump_metadata,
+		.binary_load = sieve_ldap_script_binary_load,
+		.binary_save = sieve_ldap_script_binary_save,
+
+		.equals = sieve_ldap_script_equals
+	}
+};
+
+/*
+ * Script sequence
+ */
+
+struct sieve_ldap_script_sequence {
+	struct sieve_script_sequence seq;
+
+	bool done:1;
+};
+
+struct sieve_script_sequence *sieve_ldap_storage_get_script_sequence
+(struct sieve_storage *storage, enum sieve_error *error_r)
+{
+	struct sieve_ldap_script_sequence *lsec = NULL;
+
+	if ( error_r != NULL )
+		*error_r = SIEVE_ERROR_NONE;
+
+	/* Create sequence object */
+	lsec = i_new(struct sieve_ldap_script_sequence, 1);
+	sieve_script_sequence_init(&lsec->seq, storage);
+
+	return &lsec->seq;
+}
+
+struct sieve_script *sieve_ldap_script_sequence_next
+(struct sieve_script_sequence *seq, enum sieve_error *error_r)
+{
+	struct sieve_ldap_script_sequence *lsec =
+		(struct sieve_ldap_script_sequence *)seq;
+	struct sieve_ldap_storage *lstorage =
+		(struct sieve_ldap_storage *)seq->storage;
+	struct sieve_ldap_script *lscript;
+
+	if ( error_r != NULL )
+		*error_r = SIEVE_ERROR_NONE;
+
+	if ( lsec->done )
+		return NULL;
+	lsec->done = TRUE;
+
+	lscript = sieve_ldap_script_init
+		(lstorage, seq->storage->script_name);
+	if ( sieve_script_open(&lscript->script, error_r) < 0 ) {
+		struct sieve_script *script = &lscript->script;
+		sieve_script_unref(&script);
+		return NULL;
+	}
+
+	return &lscript->script;
+}
+
+void sieve_ldap_script_sequence_destroy
+(struct sieve_script_sequence *seq)
+{
+	struct sieve_ldap_script_sequence *lsec =
+		(struct sieve_ldap_script_sequence *)seq;
+	i_free(lsec);
+}
+
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/storage/ldap/sieve-ldap-storage-settings.c b/pigeonhole/src/lib-sieve/storage/ldap/sieve-ldap-storage-settings.c
new file mode 100644
index 0000000..35fe5cb
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/ldap/sieve-ldap-storage-settings.c
@@ -0,0 +1,169 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "env-util.h"
+#include "settings.h"
+
+#include "sieve-common.h"
+
+#include "sieve-ldap-storage.h"
+
+#if defined(SIEVE_BUILTIN_LDAP) || defined(PLUGIN_BUILD)
+
+#include "sieve-error.h"
+
+#include "sieve-ldap-db.h"
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#define DEF_STR(name) DEF_STRUCT_STR(name, sieve_ldap_storage_settings)
+#define DEF_INT(name) DEF_STRUCT_INT(name, sieve_ldap_storage_settings)
+#define DEF_BOOL(name) DEF_STRUCT_BOOL(name, sieve_ldap_storage_settings)
+
+static struct setting_def setting_defs[] = {
+	DEF_STR(hosts),
+	DEF_STR(uris),
+	DEF_STR(dn),
+	DEF_STR(dnpass),
+	DEF_BOOL(tls),
+	DEF_BOOL(sasl_bind),
+	DEF_STR(sasl_mech),
+	DEF_STR(sasl_realm),
+	DEF_STR(sasl_authz_id),
+	DEF_STR(tls_ca_cert_file),
+	DEF_STR(tls_ca_cert_dir),
+	DEF_STR(tls_cert_file),
+	DEF_STR(tls_key_file),
+	DEF_STR(tls_cipher_suite),
+	DEF_STR(tls_require_cert),
+	DEF_STR(deref),
+	DEF_STR(scope),
+	DEF_STR(base),
+	DEF_INT(ldap_version),
+	DEF_STR(debug_level),
+	DEF_STR(ldaprc_path),
+	DEF_STR(sieve_ldap_script_attr),
+	DEF_STR(sieve_ldap_mod_attr),
+	DEF_STR(sieve_ldap_filter),
+
+	{ 0, NULL, 0 }
+};
+
+static struct sieve_ldap_storage_settings default_settings = {
+	.hosts = NULL,
+	.uris = NULL,
+	.dn = NULL,
+	.dnpass = NULL,
+	.tls = FALSE,
+	.sasl_bind = FALSE,
+	.sasl_mech = NULL,
+	.sasl_realm = NULL,
+	.sasl_authz_id = NULL,
+	.tls_ca_cert_file = NULL,
+	.tls_ca_cert_dir = NULL,
+	.tls_cert_file = NULL,
+	.tls_key_file = NULL,
+	.tls_cipher_suite = NULL,
+	.tls_require_cert = NULL,
+	.deref = "never",
+	.scope = "subtree",
+	.base = NULL,
+	.ldap_version = 3,
+	.debug_level = "0",
+	.ldaprc_path = "",
+	.sieve_ldap_script_attr = "mailSieveRuleSource",
+	.sieve_ldap_mod_attr = "modifyTimestamp",
+	.sieve_ldap_filter = "(&(objectClass=posixAccount)(uid=%u))",
+};
+
+static const char *parse_setting(const char *key, const char *value,
+				 struct sieve_ldap_storage *lstorage)
+{
+	return parse_setting_from_defs
+		(lstorage->storage.pool, setting_defs, &lstorage->set, key, value);
+}
+
+int sieve_ldap_storage_read_settings
+(struct sieve_ldap_storage *lstorage, const char *config_path)
+{
+	struct sieve_storage *storage = &lstorage->storage;
+	const char *str, *error;
+	struct stat st;
+
+	if ( stat(config_path, &st) < 0 ) {
+		e_error(storage->event,
+			"Failed to read LDAP storage config: "
+			"stat(%s) failed: %m", config_path);
+		return -1;
+	}
+
+	lstorage->set = default_settings;
+	lstorage->set_mtime = st.st_mtime;
+	
+	if (!settings_read_nosection
+		(config_path, parse_setting, lstorage, &error)) {
+		sieve_storage_set_critical(storage,
+			"Failed to read LDAP storage config `%s': %s",
+			config_path, error);
+		return -1;
+	}
+
+	if (lstorage->set.base == NULL) {
+		sieve_storage_set_critical(storage,
+			"Invalid LDAP storage config `%s': "
+			"No search base given", config_path);
+		return -1;
+	}
+
+	if (lstorage->set.uris == NULL && lstorage->set.hosts == NULL) {
+		sieve_storage_set_critical(storage,
+			"Invalid LDAP storage config `%s': "
+			"No uris or hosts set", config_path);
+		return -1;
+	}
+
+	if (*lstorage->set.ldaprc_path != '\0') {
+		str = getenv("LDAPRC");
+		if (str != NULL && strcmp(str, lstorage->set.ldaprc_path) != 0) {
+			sieve_storage_set_critical(storage,
+				"Invalid LDAP storage config `%s': "
+				"Multiple different ldaprc_path settings not allowed "
+				"(%s and %s)", config_path, str, lstorage->set.ldaprc_path);
+			return -1;
+		}
+		env_put("LDAPRC", lstorage->set.ldaprc_path);
+	}
+
+	if ( ldap_deref_from_str
+		(lstorage->set.deref, &lstorage->set.ldap_deref) < 0 ) {
+		sieve_storage_set_critical(storage,
+			"Invalid LDAP storage config `%s': "
+			"Invalid deref option `%s'",
+			config_path, lstorage->set.deref);;
+	}
+
+	if ( ldap_scope_from_str
+		(lstorage->set.scope, &lstorage->set.ldap_scope) < 0 ) {
+		sieve_storage_set_critical(storage,
+			"Invalid LDAP storage config `%s': "
+			"Invalid scope option `%s'",
+			config_path, lstorage->set.scope);;
+	}
+
+#ifdef OPENLDAP_TLS_OPTIONS	
+	if ( lstorage->set.tls_require_cert != NULL &&
+		ldap_tls_require_cert_from_str(lstorage->set.tls_require_cert,
+		&lstorage->set.ldap_tls_require_cert) < 0) {
+		sieve_storage_set_critical(storage,
+			"Invalid LDAP storage config `%s': "
+			"Invalid tls_require_cert option `%s'",
+			config_path, lstorage->set.tls_require_cert);
+	}
+#endif
+	return 0;
+}
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/storage/ldap/sieve-ldap-storage.c b/pigeonhole/src/lib-sieve/storage/ldap/sieve-ldap-storage.c
new file mode 100644
index 0000000..1f7922a
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/ldap/sieve-ldap-storage.c
@@ -0,0 +1,230 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+//#include "ldap.h"
+
+#include "sieve-common.h"
+
+#include "sieve-ldap-storage.h"
+
+#if defined(SIEVE_BUILTIN_LDAP) || defined(PLUGIN_BUILD)
+
+#include "sieve-error.h"
+
+#ifndef PLUGIN_BUILD
+const struct sieve_storage sieve_ldap_storage;
+#else
+const struct sieve_storage sieve_ldap_storage_plugin;
+#endif
+
+/*
+ * Storage class
+ */
+
+static struct sieve_storage *sieve_ldap_storage_alloc(void)
+{
+	struct sieve_ldap_storage *lstorage;
+	pool_t pool;
+
+	pool = pool_alloconly_create("sieve_ldap_storage", 1024);
+	lstorage = p_new(pool, struct sieve_ldap_storage, 1);
+#ifndef PLUGIN_BUILD
+	lstorage->storage = sieve_ldap_storage;
+#else
+	lstorage->storage = sieve_ldap_storage_plugin;
+#endif
+	lstorage->storage.pool = pool;
+
+	return &lstorage->storage;
+}
+
+static int sieve_ldap_storage_init
+(struct sieve_storage *storage, const char *const *options,
+	enum sieve_error *error_r)
+{
+	struct sieve_ldap_storage *lstorage =
+		(struct sieve_ldap_storage *)storage;
+	struct sieve_instance *svinst = storage->svinst;
+	const char *username = NULL;
+
+	if ( options != NULL ) {
+		while ( *options != NULL ) {
+			const char *option = *options;
+
+			if ( strncasecmp(option, "user=", 5) == 0 && option[5] != '\0' ) {
+				username = option+5;
+			} else {
+				sieve_storage_set_critical(storage,
+					"Invalid option `%s'", option);
+				*error_r = SIEVE_ERROR_TEMP_FAILURE;
+				return -1;
+			}
+
+			options++;
+		}
+	}
+
+	if ( username == NULL ) {
+		if ( svinst->username == NULL ) {
+			sieve_storage_set_critical(storage,
+				"No username specified");
+			*error_r = SIEVE_ERROR_TEMP_FAILURE;
+			return -1;
+		}
+		username = svinst->username;
+	}
+
+	e_debug(storage->event, "user=%s, config=%s",
+		username, storage->location);
+
+	if ( sieve_ldap_storage_read_settings(lstorage, storage->location) < 0 )
+		return -1;
+
+	lstorage->username = p_strdup(storage->pool, username);
+	lstorage->config_file = p_strdup(storage->pool, storage->location);
+	lstorage->conn = sieve_ldap_db_init(lstorage);
+
+	storage->location = p_strconcat(storage->pool,
+		SIEVE_LDAP_STORAGE_DRIVER_NAME, ":", storage->location,
+		";user=", username, NULL);
+
+	return 0;
+}
+
+static void sieve_ldap_storage_destroy
+(struct sieve_storage *storage)
+{
+	struct sieve_ldap_storage *lstorage =
+		(struct sieve_ldap_storage *)storage;
+
+	if ( lstorage->conn != NULL )
+		sieve_ldap_db_unref(&lstorage->conn);
+}
+
+/*
+ * Script access
+ */
+
+static struct sieve_script *sieve_ldap_storage_get_script
+(struct sieve_storage *storage, const char *name)
+{
+	struct sieve_ldap_storage *lstorage =
+		(struct sieve_ldap_storage *)storage;
+	struct sieve_ldap_script *lscript;
+
+	T_BEGIN {
+		lscript = sieve_ldap_script_init(lstorage, name);
+	} T_END;
+
+	return &lscript->script;
+}
+
+/*
+ * Active script
+ */
+
+struct sieve_script *sieve_ldap_storage_active_script_open
+(struct sieve_storage *storage)
+{
+	struct sieve_ldap_storage *lstorage =
+		(struct sieve_ldap_storage *)storage;
+	struct sieve_ldap_script *lscript;
+
+	lscript = sieve_ldap_script_init
+		(lstorage, storage->script_name);
+	if ( sieve_script_open(&lscript->script, NULL) < 0 ) {
+		struct sieve_script *script = &lscript->script;
+		sieve_script_unref(&script);
+		return NULL;
+	}
+
+	return &lscript->script;
+}
+
+int sieve_ldap_storage_active_script_get_name
+(struct sieve_storage *storage, const char **name_r)
+{
+	if ( storage->script_name != NULL )
+		*name_r = storage->script_name;
+	else
+		*name_r = SIEVE_LDAP_SCRIPT_DEFAULT;
+	return 0;
+}
+
+/*
+ * Driver definition
+ */
+
+#ifndef PLUGIN_BUILD
+const struct sieve_storage sieve_ldap_storage = {
+#else
+const struct sieve_storage sieve_ldap_storage_plugin = {
+#endif
+	.driver_name = SIEVE_LDAP_STORAGE_DRIVER_NAME,
+	.version = 0,
+	.v = {
+		.alloc = sieve_ldap_storage_alloc,
+		.init = sieve_ldap_storage_init,
+		.destroy = sieve_ldap_storage_destroy,
+
+		.get_script = sieve_ldap_storage_get_script,
+
+		.get_script_sequence = sieve_ldap_storage_get_script_sequence,
+		.script_sequence_next = sieve_ldap_script_sequence_next,
+		.script_sequence_destroy = sieve_ldap_script_sequence_destroy,
+
+		.active_script_get_name = sieve_ldap_storage_active_script_get_name,
+		.active_script_open = sieve_ldap_storage_active_script_open,
+
+		// FIXME: impement management interface
+	}
+};
+
+#ifndef SIEVE_BUILTIN_LDAP
+/* Building a plugin */
+
+const char *sieve_storage_ldap_plugin_version = PIGEONHOLE_ABI_VERSION;
+
+void sieve_storage_ldap_plugin_load
+(struct sieve_instance *svinst, void **context);
+void sieve_storage_ldap_plugin_unload
+(struct sieve_instance *svinst, void *context);
+void sieve_storage_ldap_plugin_init(void);
+void sieve_storage_ldap_plugin_deinit(void);
+
+void sieve_storage_ldap_plugin_load
+(struct sieve_instance *svinst, void **context ATTR_UNUSED)
+{
+	sieve_storage_class_register
+		(svinst, &sieve_ldap_storage_plugin);	
+
+	e_debug(svinst->event,
+		"Sieve LDAP storage plugin for %s version %s loaded",
+		PIGEONHOLE_NAME, PIGEONHOLE_VERSION_FULL);
+}
+
+void sieve_storage_ldap_plugin_unload
+(struct sieve_instance *svinst ATTR_UNUSED,
+	void *context ATTR_UNUSED)
+{
+	sieve_storage_class_unregister
+		(svinst, &sieve_ldap_storage_plugin);	
+}
+
+void sieve_storage_ldap_plugin_init(void)
+{
+	/* Nothing */
+}
+
+void sieve_storage_ldap_plugin_deinit(void)
+{
+	/* Nothing */
+}
+#endif
+
+#else /* !defined(SIEVE_BUILTIN_LDAP) && !defined(PLUGIN_BUILD) */
+const struct sieve_storage sieve_ldap_storage = {
+	.driver_name = SIEVE_LDAP_STORAGE_DRIVER_NAME
+};
+#endif
diff --git a/pigeonhole/src/lib-sieve/storage/ldap/sieve-ldap-storage.h b/pigeonhole/src/lib-sieve/storage/ldap/sieve-ldap-storage.h
new file mode 100644
index 0000000..f97ceba
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/storage/ldap/sieve-ldap-storage.h
@@ -0,0 +1,108 @@
+#ifndef SIEVE_LDAP_STORAGE_H
+#define SIEVE_LDAP_STORAGE_H
+
+#include "sieve.h"
+#include "sieve-script-private.h"
+#include "sieve-storage-private.h"
+
+#define SIEVE_LDAP_SCRIPT_DEFAULT "default"
+
+#if defined(SIEVE_BUILTIN_LDAP) || defined(PLUGIN_BUILD)
+
+#include "sieve-ldap-db.h"
+
+struct sieve_ldap_storage;
+
+/*
+ * LDAP settings
+ */
+
+struct sieve_ldap_storage_settings {
+	const char *hosts;
+	const char *uris;
+	const char *dn;
+	const char *dnpass;
+
+	bool tls;
+	bool sasl_bind;
+	const char *sasl_mech;
+	const char *sasl_realm;
+	const char *sasl_authz_id;
+
+	const char *tls_ca_cert_file;
+	const char *tls_ca_cert_dir;
+	const char *tls_cert_file;
+	const char *tls_key_file;
+	const char *tls_cipher_suite;
+	const char *tls_require_cert;
+
+	const char *deref;
+	const char *scope;
+	const char *base;
+	unsigned int ldap_version;
+
+	const char *ldaprc_path;
+	const char *debug_level;
+
+	const char *sieve_ldap_script_attr;
+	const char *sieve_ldap_mod_attr;
+	const char *sieve_ldap_filter;
+
+	/* ... */
+	int ldap_deref, ldap_scope, ldap_tls_require_cert;
+};
+
+int sieve_ldap_storage_read_settings
+	(struct sieve_ldap_storage *lstorage, const char *config_path);
+
+/*
+ * Storage class
+ */
+
+struct sieve_ldap_storage {
+	struct sieve_storage storage;
+
+	struct sieve_ldap_storage_settings set;
+	time_t set_mtime;
+
+	const char *config_file;
+	const char *username; // FIXME: needed?
+
+	struct ldap_connection *conn;
+};
+
+struct sieve_script *sieve_ldap_storage_active_script_open
+	(struct sieve_storage *storage);
+int sieve_ldap_storage_active_script_get_name
+	(struct sieve_storage *storage, const char **name_r);
+
+/*
+ * Script class
+ */
+
+struct sieve_ldap_script {
+	struct sieve_script script;
+
+	const char *dn;
+	const char *modattr;
+
+	const char *binpath;
+};
+
+struct sieve_ldap_script *sieve_ldap_script_init
+	(struct sieve_ldap_storage *lstorage, const char *name);
+
+/*
+ * Script sequence
+ */
+
+struct sieve_script_sequence *sieve_ldap_storage_get_script_sequence
+	(struct sieve_storage *storage, enum sieve_error *error_r);
+
+struct sieve_script *sieve_ldap_script_sequence_next
+    (struct sieve_script_sequence *seq, enum sieve_error *error_r);
+void sieve_ldap_script_sequence_destroy(struct sieve_script_sequence *seq);
+
+#endif
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/tst-address.c b/pigeonhole/src/lib-sieve/tst-address.c
new file mode 100644
index 0000000..086679d
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/tst-address.c
@@ -0,0 +1,280 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-message.h"
+#include "sieve-address.h"
+#include "sieve-address-parts.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-match.h"
+
+#include <stdio.h>
+
+/*
+ * Address test
+ *
+ * Syntax:
+ *    address [ADDRESS-PART] [COMPARATOR] [MATCH-TYPE]
+ *       <header-list: string-list> <key-list: string-list>
+ */
+
+static bool tst_address_registered
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+static bool tst_address_validate
+	(struct sieve_validator *valdtr, struct sieve_command *tst);
+static bool tst_address_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx);
+
+const struct sieve_command_def tst_address = {
+	.identifier = "address",
+	.type = SCT_TEST,
+	.positional_args = 2,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = tst_address_registered,
+	.validate = tst_address_validate,
+	.generate = tst_address_generate
+};
+
+/*
+ * Address operation
+ */
+
+static bool tst_address_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int tst_address_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def tst_address_operation = {
+	.mnemonic = "ADDRESS",
+	.code = SIEVE_OPERATION_ADDRESS,
+	.dump = tst_address_operation_dump,
+	.execute = tst_address_operation_execute
+};
+
+/*
+ * Test registration
+ */
+
+static bool tst_address_registered
+(struct sieve_validator *valdtr, const struct sieve_extension *ext ATTR_UNUSED,
+	struct sieve_command_registration *cmd_reg)
+{
+	/* The order of these is not significant */
+	sieve_comparators_link_tag
+		(valdtr, cmd_reg, SIEVE_MATCH_OPT_COMPARATOR );
+	sieve_match_types_link_tags
+		(valdtr, cmd_reg, SIEVE_MATCH_OPT_MATCH_TYPE);
+	sieve_address_parts_link_tags
+		(valdtr, cmd_reg, SIEVE_AM_OPT_ADDRESS_PART);
+	return TRUE;
+}
+
+/*
+ * Validation
+ */
+
+/* List of valid headers:
+ *   Implementations MUST restrict the address test to headers that
+ *   contain addresses, but MUST include at least From, To, Cc, Bcc,
+ *   Sender, Resent-From, and Resent-To, and it SHOULD include any other
+ *   header that utilizes an "address-list" structured header body.
+ *
+ * This list explicitly does not contain the envelope-to and return-path
+ * headers. The envelope test must be used to test against these addresses.
+ *
+ * FIXME: this restriction is somewhat odd. Sieve list advises to allow
+ *        any other header as long as its content matches the address-list
+ *        grammar.
+ */
+static const char * const _allowed_headers[] = {
+	/* Required */
+	"from", "to", "cc", "bcc", "sender", "resent-from", "resent-to",
+
+	/* Additional (RFC 822 / RFC 2822) */
+	"reply-to", "resent-reply-to", "resent-sender", "resent-cc", "resent-bcc",
+
+	/* Non-standard (RFC 2076, draft-palme-mailext-headers-08.txt) */
+	"for-approval", "for-handling", "for-comment", "apparently-to", "errors-to",
+	"delivered-to", "return-receipt-to", "x-admin", "read-receipt-to",
+	"x-confirm-reading-to", "return-receipt-requested",
+	"registered-mail-reply-requested-by", "mail-followup-to", "mail-reply-to",
+	"abuse-reports-to", "x-complaints-to", "x-report-abuse-to",
+
+	/* Undocumented */
+	"x-beenthere", "x-original-to",
+
+	NULL
+};
+
+static int _header_is_allowed
+(void *context ATTR_UNUSED, struct sieve_ast_argument *arg)
+{
+	if ( sieve_argument_is_string_literal(arg) ) {
+		const char *header = sieve_ast_strlist_strc(arg);
+
+		const char * const *hdsp = _allowed_headers;
+		while ( *hdsp != NULL ) {
+			if ( strcasecmp( *hdsp, header ) == 0 )
+				return 1;
+
+			hdsp++;
+		}
+
+		return 0;
+	}
+
+	return 1;
+}
+
+static bool tst_address_validate
+(struct sieve_validator *valdtr, struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+	struct sieve_ast_argument *header;
+	struct sieve_comparator cmp_default =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+	struct sieve_match_type mcht_default =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "header list", 1, SAAT_STRING_LIST) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, tst, arg, FALSE) )
+		return FALSE;
+
+	if ( !sieve_command_verify_headers_argument(valdtr, arg) )
+        return FALSE;
+
+	/* Check if supplied header names are allowed
+	 *   FIXME: verify dynamic header names at runtime
+	 */
+	header = arg;
+	if ( sieve_ast_stringlist_map
+		(&header, NULL, _header_is_allowed) <= 0 ) {
+		i_assert(header != NULL);
+		sieve_argument_validate_error(valdtr, header,
+			"specified header '%s' is not allowed for the address test",
+			str_sanitize(sieve_ast_strlist_strc(header), 64));
+		return FALSE;
+	}
+
+	/* Check key list */
+
+	arg = sieve_ast_argument_next(arg);
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "key list", 2, SAAT_STRING_LIST) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, tst, arg, FALSE) )
+		return FALSE;
+
+	/* Validate the key argument to a specified match type */
+	return sieve_match_type_validate
+		(valdtr, tst, arg, &mcht_default, &cmp_default);
+}
+
+/*
+ * Code generation
+ */
+
+static bool tst_address_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *tst)
+{
+	sieve_operation_emit(cgenv->sblock, NULL, &tst_address_operation);
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, tst, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool tst_address_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "ADDRESS");
+	sieve_code_descend(denv);
+
+	/* Handle any optional arguments */
+	if ( sieve_message_opr_optional_dump(denv, address, NULL) != 0 )
+		return FALSE;
+
+	return
+		sieve_opr_stringlist_dump(denv, address, "header list") &&
+		sieve_opr_stringlist_dump(denv, address, "key list");
+}
+
+/*
+ * Code execution
+ */
+
+static int tst_address_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	struct sieve_comparator cmp =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+	struct sieve_match_type mcht =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	struct sieve_address_part addrp =
+		SIEVE_ADDRESS_PART_DEFAULT(all_address_part);
+	struct sieve_stringlist *hdr_list, *hdr_value_list, *value_list, *key_list;
+	struct sieve_address_list *addr_list;
+	ARRAY_TYPE(sieve_message_override) svmos;
+	int match, ret;
+
+	/* Read optional operands */
+	i_zero(&svmos);
+	if ( sieve_message_opr_optional_read
+		(renv, address, NULL, &ret, &addrp, &mcht, &cmp, &svmos) < 0 )
+		return ret;
+
+	/* Read header-list */
+	if ( (ret=sieve_opr_stringlist_read(renv, address, "header-list", &hdr_list))
+		<= 0 )
+		return ret;
+
+	/* Read key-list */
+	if ( (ret=sieve_opr_stringlist_read(renv, address, "key-list", &key_list))
+		<= 0 )
+		return ret;
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS, "address test");
+
+	/* Get header */
+	sieve_runtime_trace_descend(renv);
+	if ( (ret=sieve_message_get_header_fields
+		(renv, hdr_list, &svmos, FALSE, &hdr_value_list)) <= 0 )
+		return ret;
+	sieve_runtime_trace_ascend(renv);
+
+	/* Create value stringlist */
+	addr_list = sieve_header_address_list_create(renv, hdr_value_list);
+	value_list = sieve_address_part_stringlist_create(renv, &addrp, addr_list);
+
+	/* Perform match */
+	if ( (match=sieve_match(renv, &mcht, &cmp, value_list, key_list, &ret)) < 0 )
+		return ret;
+
+	/* Set test result for subsequent conditional jump */
+	sieve_interpreter_set_test_result(renv->interp, match > 0);
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/tst-allof.c b/pigeonhole/src/lib-sieve/tst-allof.c
new file mode 100644
index 0000000..6d278b9
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/tst-allof.c
@@ -0,0 +1,108 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-binary.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+
+/*
+ * Allof test
+ *
+ * Syntax
+ *   allof <tests: test-list>
+ */
+
+static bool tst_allof_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx,
+		struct sieve_jumplist *jumps, bool jump_true);
+static bool tst_allof_validate_const
+	(struct sieve_validator *valdtr, struct sieve_command *tst,
+		int *const_current, int const_new);
+
+const struct sieve_command_def tst_allof = {
+	.identifier = "allof",
+	.type = SCT_TEST,
+	.positional_args = 0,
+	.subtests = 2,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate_const = tst_allof_validate_const,
+	.control_generate = tst_allof_generate
+};
+
+/*
+ * Code validation
+ */
+
+static bool tst_allof_validate_const
+(struct sieve_validator *valdtr ATTR_UNUSED,
+	struct sieve_command *tst ATTR_UNUSED, int *const_current, int const_next)
+{
+	if ( const_next == 0 ) {
+		*const_current = 0;
+		return FALSE;
+	}
+
+	if ( *const_current != -1 )
+		*const_current = const_next;
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool tst_allof_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx,
+	struct sieve_jumplist *jumps, bool jump_true)
+{
+	struct sieve_binary_block *sblock = cgenv->sblock;
+	struct sieve_ast_node *test;
+	struct sieve_jumplist false_jumps;
+
+	if ( sieve_ast_test_count(ctx->ast_node) > 1 ) {
+		if ( jump_true ) {
+			/* Prepare jumplist */
+			sieve_jumplist_init_temp(&false_jumps, sblock);
+		}
+
+		test = sieve_ast_test_first(ctx->ast_node);
+		while ( test != NULL ) {
+			bool result;
+
+			/* If this test list must jump on false, all sub-tests can simply add their jumps
+			 * to the caller's jump list, otherwise this test redirects all false jumps to the
+			 * end of the currently generated code. This is just after a final jump to the true
+			 * case
+			 */
+			if ( jump_true )
+				result = sieve_generate_test(cgenv, test, &false_jumps, FALSE);
+			else
+				result = sieve_generate_test(cgenv, test, jumps, FALSE);
+
+			if ( !result ) return FALSE;
+
+			test = sieve_ast_test_next(test);
+		}
+
+		if ( jump_true ) {
+			/* All tests succeeded, jump to case TRUE */
+			sieve_operation_emit(cgenv->sblock, NULL, &sieve_jmp_operation);
+			sieve_jumplist_add(jumps, sieve_binary_emit_offset(sblock, 0));
+
+			/* All false exits jump here */
+			sieve_jumplist_resolve(&false_jumps);
+		}
+	} else {
+		/* Script author is being inefficient; we can optimize the allof test away */
+		test = sieve_ast_test_first(ctx->ast_node);
+		sieve_generate_test(cgenv, test, jumps, jump_true);
+	}
+
+	return TRUE;
+}
+
diff --git a/pigeonhole/src/lib-sieve/tst-anyof.c b/pigeonhole/src/lib-sieve/tst-anyof.c
new file mode 100644
index 0000000..84bfedd
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/tst-anyof.c
@@ -0,0 +1,107 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-generator.h"
+#include "sieve-validator.h"
+#include "sieve-binary.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+
+/*
+ * Anyof test
+ *
+ * Syntax
+ *   anyof <tests: test-list>
+ */
+
+static bool tst_anyof_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx,
+		struct sieve_jumplist *jumps, bool jump_true);
+static bool tst_anyof_validate_const
+	(struct sieve_validator *valdtr, struct sieve_command *tst,
+		int *const_current, int const_next);
+
+const struct sieve_command_def tst_anyof = {
+	.identifier = "anyof",
+	.type = SCT_TEST,
+	.positional_args = 0,
+	.subtests = 2,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate_const = tst_anyof_validate_const,
+	.control_generate = tst_anyof_generate
+};
+
+/*
+ * Code validation
+ */
+
+static bool tst_anyof_validate_const
+(struct sieve_validator *valdtr ATTR_UNUSED,
+	struct sieve_command *tst ATTR_UNUSED, int *const_current, int const_next)
+{
+	if ( const_next > 0 ) {
+		*const_current = 1;
+		return FALSE;
+	}
+
+	if ( *const_current != -1 )
+		*const_current = const_next;
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool tst_anyof_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx,
+		struct sieve_jumplist *jumps, bool jump_true)
+{
+	struct sieve_binary_block *sblock = cgenv->sblock;
+	struct sieve_ast_node *test;
+	struct sieve_jumplist true_jumps;
+
+	if ( sieve_ast_test_count(ctx->ast_node) > 1 ) {
+		if ( !jump_true ) {
+			/* Prepare jumplist */
+			sieve_jumplist_init_temp(&true_jumps, sblock);
+		}
+
+		test = sieve_ast_test_first(ctx->ast_node);
+		while ( test != NULL ) {
+			bool result;
+
+			/* If this test list must jump on true, all sub-tests can simply add their jumps
+			 * to the caller's jump list, otherwise this test redirects all true jumps to the
+			 * end of the currently generated code. This is just after a final jump to the false
+			 * case
+			 */
+			if ( !jump_true )
+				result = sieve_generate_test(cgenv, test, &true_jumps, TRUE);
+			else
+				result = sieve_generate_test(cgenv, test, jumps, TRUE);
+
+			if ( !result ) return FALSE;
+
+			test = sieve_ast_test_next(test);
+		}
+
+		if ( !jump_true ) {
+			/* All tests failed, jump to case FALSE */
+			sieve_operation_emit(sblock, NULL, &sieve_jmp_operation);
+			sieve_jumplist_add(jumps, sieve_binary_emit_offset(sblock, 0));
+
+			/* All true exits jump here */
+			sieve_jumplist_resolve(&true_jumps);
+		}
+	} else {
+		/* Script author is being inefficient; we can optimize the allof test away */
+		test = sieve_ast_test_first(ctx->ast_node);
+		sieve_generate_test(cgenv, test, jumps, jump_true);
+	}
+
+	return TRUE;
+}
diff --git a/pigeonhole/src/lib-sieve/tst-exists.c b/pigeonhole/src/lib-sieve/tst-exists.c
new file mode 100644
index 0000000..0668c30
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/tst-exists.c
@@ -0,0 +1,179 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-message.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-code-dumper.h"
+
+/*
+ * Exists test
+ *
+ * Syntax:
+ *    exists <header-names: string-list>
+ */
+
+static bool tst_exists_validate
+	(struct sieve_validator *valdtr, struct sieve_command *tst);
+static bool tst_exists_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *tst);
+
+const struct sieve_command_def tst_exists = {
+	.identifier = "exists",
+	.type = SCT_TEST,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = tst_exists_validate,
+	.generate = tst_exists_generate
+};
+
+/*
+ * Exists operation
+ */
+
+static bool tst_exists_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int tst_exists_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def tst_exists_operation = {
+	.mnemonic = "EXISTS",
+	.code = SIEVE_OPERATION_EXISTS,
+	.dump = tst_exists_operation_dump,
+	.execute = tst_exists_operation_execute
+};
+
+/*
+ * Validation
+ */
+
+static bool tst_exists_validate
+  (struct sieve_validator *valdtr, struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "header names", 1, SAAT_STRING_LIST) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, tst, arg, FALSE) )
+		return FALSE;
+
+	return sieve_command_verify_headers_argument(valdtr, arg);
+}
+
+/*
+ * Code generation
+ */
+
+static bool tst_exists_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *tst)
+{
+	sieve_operation_emit(cgenv->sblock, NULL, &tst_exists_operation);
+
+ 	/* Generate arguments */
+    return sieve_generate_arguments(cgenv, tst, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool tst_exists_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "EXISTS");
+	sieve_code_descend(denv);
+
+	/* Optional operands */
+	if ( sieve_message_opr_optional_dump(denv, address, NULL) != 0 )
+		return FALSE;
+
+	return sieve_opr_stringlist_dump(denv, address, "header names");
+}
+
+/*
+ * Code execution
+ */
+
+static int tst_exists_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	struct sieve_stringlist *hdr_list;
+	ARRAY_TYPE(sieve_message_override) svmos;
+	string_t *hdr_item;
+	bool matched;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Optional operands */
+	i_zero(&svmos);
+	if ( sieve_message_opr_optional_read
+		(renv, address, NULL, &ret, NULL, NULL, NULL, &svmos) < 0 )
+		return ret;
+
+	/* Read header-list */
+	if ( (ret=sieve_opr_stringlist_read(renv, address, "header-list", &hdr_list))
+		<= 0 )
+		return ret;
+
+	/*
+	 * Perfrom test
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS, "exists test");
+	sieve_runtime_trace_descend(renv);
+
+	/* Iterate through all requested headers to match (must find all specified) */
+	hdr_item = NULL;
+	matched = TRUE;
+	while ( matched &&
+		(ret=sieve_stringlist_next_item(hdr_list, &hdr_item)) > 0 ) {
+		struct sieve_stringlist *value_list;
+		string_t *dummy;
+
+		/* Get header */
+		if ( (ret=sieve_message_get_header_fields
+			(renv, sieve_single_stringlist_create(renv, hdr_item, FALSE),
+				&svmos, FALSE, &value_list)) <= 0 )
+			return ret;
+
+		if ( (ret=sieve_stringlist_next_item(value_list, &dummy)) < 0)
+			return value_list->exec_status;
+
+		if ( ret == 0 )
+			matched = FALSE;
+
+		sieve_runtime_trace(renv, SIEVE_TRLVL_MATCHING,
+			"header `%s' %s", str_sanitize(str_c(hdr_item), 80),
+			( matched ? "exists" : "is missing" ));
+	}
+
+	if ( matched )
+		sieve_runtime_trace(renv, SIEVE_TRLVL_MATCHING, "all headers exist");
+	else
+		sieve_runtime_trace(renv, SIEVE_TRLVL_MATCHING, "headers are missing");
+
+	/* Set test result for subsequent conditional jump */
+	if ( ret >= 0 ) {
+		sieve_interpreter_set_test_result(renv->interp, matched);
+		return SIEVE_EXEC_OK;
+	}
+
+	sieve_runtime_trace_error(renv, "invalid header-list item");
+	return SIEVE_EXEC_BIN_CORRUPT;
+}
diff --git a/pigeonhole/src/lib-sieve/tst-header.c b/pigeonhole/src/lib-sieve/tst-header.c
new file mode 100644
index 0000000..6e553a2
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/tst-header.c
@@ -0,0 +1,204 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-message.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-match.h"
+
+/*
+ * Header test
+ *
+ * Syntax:
+ *   header [COMPARATOR] [MATCH-TYPE]
+ *     <header-names: string-list> <key-list: string-list>
+ */
+
+static bool tst_header_registered
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+static bool tst_header_validate
+	(struct sieve_validator *valdtr, struct sieve_command *tst);
+static bool tst_header_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *tst);
+
+const struct sieve_command_def tst_header = {
+	.identifier = "header",
+	.type = SCT_TEST,
+	.positional_args = 2,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = tst_header_registered,
+	.validate = tst_header_validate,
+	.generate = tst_header_generate
+};
+
+/*
+ * Header operation
+ */
+
+static bool tst_header_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int tst_header_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def tst_header_operation = {
+	.mnemonic = "HEADER",
+	.code = SIEVE_OPERATION_HEADER,
+	.dump = tst_header_operation_dump,
+	.execute = tst_header_operation_execute
+};
+
+/*
+ * Test registration
+ */
+
+static bool tst_header_registered
+(struct sieve_validator *valdtr, const struct sieve_extension *ext ATTR_UNUSED,
+	struct sieve_command_registration *cmd_reg)
+{
+	/* The order of these is not significant */
+	sieve_comparators_link_tag(valdtr, cmd_reg, SIEVE_MATCH_OPT_COMPARATOR);
+	sieve_match_types_link_tags(valdtr, cmd_reg, SIEVE_MATCH_OPT_MATCH_TYPE);
+
+	return TRUE;
+}
+
+/*
+ * Validation
+ */
+
+static bool tst_header_validate
+(struct sieve_validator *valdtr, struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+	struct sieve_comparator cmp_default =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+	struct sieve_match_type mcht_default =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "header names", 1, SAAT_STRING_LIST) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, tst, arg, FALSE) )
+		return FALSE;
+
+	if ( !sieve_command_verify_headers_argument(valdtr, arg) )
+		return FALSE;
+
+	arg = sieve_ast_argument_next(arg);
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "key list", 2, SAAT_STRING_LIST) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, tst, arg, FALSE) )
+		return FALSE;
+
+	/* Validate the key argument to a specified match type */
+	return sieve_match_type_validate
+		(valdtr, tst, arg, &mcht_default, &cmp_default);
+}
+
+/*
+ * Code generation
+ */
+
+static bool tst_header_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *tst)
+{
+	sieve_operation_emit(cgenv->sblock, NULL, &tst_header_operation);
+
+ 	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, tst, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool tst_header_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "HEADER");
+	sieve_code_descend(denv);
+
+	/* Optional operands */
+	if ( sieve_message_opr_optional_dump(denv, address, NULL) != 0 )
+		return FALSE;
+
+	return
+		sieve_opr_stringlist_dump(denv, address, "header names") &&
+		sieve_opr_stringlist_dump(denv, address, "key list");
+}
+
+/*
+ * Code execution
+ */
+
+static int tst_header_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	struct sieve_comparator cmp =
+		SIEVE_COMPARATOR_DEFAULT(i_ascii_casemap_comparator);
+	struct sieve_match_type mcht =
+		SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	struct sieve_stringlist *hdr_list, *key_list, *value_list;
+	ARRAY_TYPE(sieve_message_override) svmos;
+	int match, ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Optional operands */
+	i_zero(&svmos);
+	if ( sieve_message_opr_optional_read
+		(renv, address, NULL, &ret, NULL, &mcht, &cmp, &svmos) < 0 )
+		return ret;
+
+	/* Read header-list */
+	if ( (ret=sieve_opr_stringlist_read(renv, address, "header-list", &hdr_list))
+		<= 0 )
+		return ret;
+
+	/* Read key-list */
+	if ( (ret=sieve_opr_stringlist_read(renv, address, "key-list", &key_list))
+		<= 0 )
+		return ret;
+
+	/*
+	 * Perform test
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS, "header test");
+
+	/* Get header */
+	sieve_runtime_trace_descend(renv);
+	if ( (ret=sieve_message_get_header_fields
+		(renv, hdr_list, &svmos, TRUE, &value_list)) <= 0 )
+		return ret;
+	sieve_runtime_trace_ascend(renv);
+
+	/* Perform match */
+	if ( (match=sieve_match(renv, &mcht, &cmp, value_list, key_list, &ret)) < 0 )
+		return ret;
+
+	/* Set test result for subsequent conditional jump */
+	sieve_interpreter_set_test_result(renv->interp, match > 0);
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/tst-not.c b/pigeonhole/src/lib-sieve/tst-not.c
new file mode 100644
index 0000000..9687d49
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/tst-not.c
@@ -0,0 +1,67 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+
+/*
+ * Not test
+ *
+ * Syntax:
+ *   not <tests: test-list>
+ */
+
+static bool tst_not_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx,
+		struct sieve_jumplist *jumps, bool jump_true);
+static bool tst_not_validate_const
+	(struct sieve_validator *valdtr, struct sieve_command *tst,
+		int *const_current, int const_next);
+
+const struct sieve_command_def tst_not = {
+	.identifier = "not",
+	.type = SCT_TEST,
+	.positional_args = 0,
+	.subtests = 1,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate_const = tst_not_validate_const,
+	.control_generate = tst_not_generate
+};
+
+/*
+ * Code validation
+ */
+
+static bool tst_not_validate_const
+(struct sieve_validator *valdtr ATTR_UNUSED,
+	struct sieve_command *tst ATTR_UNUSED, int *const_current, int const_next)
+{
+	if ( const_next < 0 )
+		*const_current = -1;
+	else if ( const_next > 0 )
+		*const_current = 0;
+	else
+		*const_current = 1;
+
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool tst_not_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx,
+	struct sieve_jumplist *jumps, bool jump_true)
+{
+	struct sieve_ast_node *test;
+
+	/* Validator verified the existance of the single test already */
+	test = sieve_ast_test_first(ctx->ast_node);
+
+	return sieve_generate_test(cgenv, test, jumps, !jump_true);
+}
+
diff --git a/pigeonhole/src/lib-sieve/tst-size.c b/pigeonhole/src/lib-sieve/tst-size.c
new file mode 100644
index 0000000..1ed101b
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/tst-size.c
@@ -0,0 +1,318 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "mail-storage.h"
+
+#include "sieve-common.h"
+#include "sieve-code.h"
+#include "sieve-message.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+/*
+ * Size test
+ *
+ * Syntax:
+ *    size <":over" / ":under"> <limit: number>
+ */
+
+static bool
+tst_size_registered(struct sieve_validator *valdtr,
+		    const struct sieve_extension *ext,
+		    struct sieve_command_registration *cmd_reg);
+static bool
+tst_size_pre_validate(struct sieve_validator *valdtr,
+		      struct sieve_command *tst);
+static bool
+tst_size_validate(struct sieve_validator *valdtr, struct sieve_command *tst);
+static bool
+tst_size_generate(const struct sieve_codegen_env *cgenv,
+		  struct sieve_command *ctx);
+
+const struct sieve_command_def tst_size = {
+	.identifier = "size",
+	.type = SCT_TEST,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = tst_size_registered,
+	.pre_validate = tst_size_pre_validate,
+	.validate = tst_size_validate,
+	.generate = tst_size_generate
+};
+
+/*
+ * Size operations
+ */
+
+static bool
+tst_size_operation_dump(const struct sieve_dumptime_env *denv,
+			sieve_size_t *address);
+static int
+tst_size_operation_execute(const struct sieve_runtime_env *renv,
+			   sieve_size_t *address);
+
+const struct sieve_operation_def tst_size_over_operation = {
+	.mnemonic = "SIZE-OVER",
+	.code = SIEVE_OPERATION_SIZE_OVER,
+	.dump = tst_size_operation_dump,
+	.execute = tst_size_operation_execute
+};
+
+const struct sieve_operation_def tst_size_under_operation = {
+	.mnemonic = "SIZE-UNDER",
+	.code = SIEVE_OPERATION_SIZE_UNDER,
+	.dump = tst_size_operation_dump,
+	.execute = tst_size_operation_execute
+};
+
+/*
+ * Context data
+ */
+
+struct tst_size_context_data {
+	enum { SIZE_UNASSIGNED, SIZE_UNDER, SIZE_OVER } type;
+};
+
+#define TST_SIZE_ERROR_DUP_TAG \
+	"exactly one of the ':under' or ':over' tags must be specified " \
+	"for the size test, but more were found"
+
+/*
+ * Tag validation
+ */
+
+static bool
+tst_size_validate_over_tag(struct sieve_validator *valdtr,
+			   struct sieve_ast_argument **arg,
+			   struct sieve_command *tst)
+{
+	struct tst_size_context_data *ctx_data =
+		(struct tst_size_context_data *)tst->data;
+
+	if (ctx_data->type != SIZE_UNASSIGNED) {
+		sieve_argument_validate_error(valdtr, *arg,
+					      TST_SIZE_ERROR_DUP_TAG);
+		return FALSE;
+	}
+
+	ctx_data->type = SIZE_OVER;
+
+	/* Delete this tag */
+	*arg = sieve_ast_arguments_detach(*arg, 1);
+
+	return TRUE;
+}
+
+static bool
+tst_size_validate_under_tag(struct sieve_validator *valdtr,
+			    struct sieve_ast_argument **arg ATTR_UNUSED,
+			    struct sieve_command *tst)
+{
+	struct tst_size_context_data *ctx_data =
+		(struct tst_size_context_data *)tst->data;
+
+	if (ctx_data->type != SIZE_UNASSIGNED) {
+		sieve_argument_validate_error(valdtr, *arg,
+					      TST_SIZE_ERROR_DUP_TAG);
+		return FALSE;
+	}
+
+	ctx_data->type = SIZE_UNDER;
+
+	/* Delete this tag */
+	*arg = sieve_ast_arguments_detach(*arg, 1);
+
+	return TRUE;
+}
+
+/*
+ * Test registration
+ */
+
+static const struct sieve_argument_def size_over_tag = {
+	.identifier = "over",
+	.validate = tst_size_validate_over_tag
+};
+
+static const struct sieve_argument_def size_under_tag = {
+	.identifier = "under",
+	.validate = tst_size_validate_under_tag,
+};
+
+static bool
+tst_size_registered(struct sieve_validator *valdtr,
+		    const struct sieve_extension *ext ATTR_UNUSED,
+		    struct sieve_command_registration *cmd_reg)
+{
+	/* Register our tags */
+	sieve_validator_register_tag(valdtr, cmd_reg, NULL, &size_over_tag, 0);
+	sieve_validator_register_tag(valdtr, cmd_reg, NULL, &size_under_tag, 0);
+
+	return TRUE;
+}
+
+/*
+ * Test validation
+ */
+
+static bool
+tst_size_pre_validate(struct sieve_validator *valdtr ATTR_UNUSED,
+		      struct sieve_command *tst)
+{
+	struct tst_size_context_data *ctx_data;
+
+	/* Assign context */
+	ctx_data = p_new(sieve_command_pool(tst),
+			 struct tst_size_context_data, 1);
+	ctx_data->type = SIZE_UNASSIGNED;
+	tst->data = ctx_data;
+
+	return TRUE;
+}
+
+static bool
+tst_size_validate(struct sieve_validator *valdtr, struct sieve_command *tst)
+{
+	struct tst_size_context_data *ctx_data =
+		(struct tst_size_context_data *)tst->data;
+	struct sieve_ast_argument *arg = tst->first_positional;
+
+	if (ctx_data->type == SIZE_UNASSIGNED) {
+		sieve_command_validate_error(valdtr, tst,
+			"the size test requires either the :under or the :over tag "
+			"to be specified");
+		return FALSE;
+	}
+
+	if (!sieve_validate_positional_argument(valdtr, tst, arg, "limit", 1,
+						SAAT_NUMBER))
+		return FALSE;
+
+	return sieve_validator_argument_activate(valdtr, tst, arg, FALSE);
+}
+
+/*
+ * Code generation
+ */
+
+bool tst_size_generate(const struct sieve_codegen_env *cgenv,
+		       struct sieve_command *tst)
+{
+	struct tst_size_context_data *ctx_data =
+		(struct tst_size_context_data *)tst->data;
+
+	if (ctx_data->type == SIZE_OVER) {
+		sieve_operation_emit(cgenv->sblock, NULL,
+				     &tst_size_over_operation);
+	} else {
+		sieve_operation_emit(cgenv->sblock, NULL,
+				     &tst_size_under_operation);
+	}
+
+ 	/* Generate arguments */
+	if (!sieve_generate_arguments(cgenv, tst, NULL))
+		return FALSE;
+
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+tst_size_operation_dump(const struct sieve_dumptime_env *denv,
+			sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "%s", sieve_operation_mnemonic(denv->oprtn));
+	sieve_code_descend(denv);
+
+	return sieve_opr_number_dump(denv, address, "limit");
+}
+
+/*
+ * Code execution
+ */
+
+static inline bool
+tst_size_get(const struct sieve_runtime_env *renv, sieve_number_t *size)
+{
+	struct mail *mail = sieve_message_get_mail(renv->msgctx);
+	uoff_t psize;
+
+	if (mail_get_physical_size(mail, &psize) < 0)
+		return FALSE;
+
+	*size = psize;
+	return TRUE;
+}
+
+static int
+tst_size_operation_execute(const struct sieve_runtime_env *renv,
+			   sieve_size_t *address)
+{
+	sieve_number_t mail_size, limit;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Read size limit */
+	if ((ret = sieve_opr_number_read(renv, address, "limit", &limit)) <= 0)
+		return ret;
+
+	/*
+	 * Perform test
+	 */
+
+	/* Get the size of the message */
+	if (!tst_size_get(renv, &mail_size)) {
+		/* FIXME: improve this error */
+		e_error(renv->event, "failed to assess message size");
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	/* Perform the test */
+	if (sieve_operation_is(renv->oprtn, tst_size_over_operation)) {
+		sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS, "size :over test");
+
+		if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_MATCHING)) {
+			sieve_runtime_trace_descend(renv);
+
+			sieve_runtime_trace(
+				renv, 0, "comparing message size %llu",
+				(unsigned long long)mail_size);
+			sieve_runtime_trace(
+				renv, 0, "with upper limit %llu",
+				(unsigned long long)limit);
+		}
+
+		sieve_interpreter_set_test_result(renv->interp,
+						  (mail_size > limit));
+	} else {
+		sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+				    "size :under test");
+
+		if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_MATCHING)) {
+			sieve_runtime_trace_descend(renv);
+
+			sieve_runtime_trace(
+				renv, 0, "comparing message size %llu",
+				(unsigned long long)mail_size);
+			sieve_runtime_trace(
+				renv, 0, "with lower limit %llu",
+				(unsigned long long)limit);
+		}
+
+		sieve_interpreter_set_test_result(renv->interp,
+						  (mail_size < limit));
+	}
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/lib-sieve/tst-truefalse.c b/pigeonhole/src/lib-sieve/tst-truefalse.c
new file mode 100644
index 0000000..6373ce3
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/tst-truefalse.c
@@ -0,0 +1,104 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-ast.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-binary.h"
+
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-interpreter.h"
+
+/*
+ * True/False test command
+ */
+
+static bool tst_false_validate_const
+	(struct sieve_validator *valdtr, struct sieve_command *tst,
+		int *const_current, int const_next);
+static bool tst_false_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd,
+		struct sieve_jumplist *jumps, bool jump_true);
+
+const struct sieve_command_def tst_false = {
+	.identifier = "false",
+	.type = SCT_TEST,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate_const = tst_false_validate_const,
+	.control_generate = tst_false_generate
+};
+
+static bool tst_true_validate_const
+	(struct sieve_validator *valdtr, struct sieve_command *tst,
+		int *const_current, int const_next);
+static bool tst_true_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd,
+		struct sieve_jumplist *jumps, bool jump_true);
+
+const struct sieve_command_def tst_true = {
+	.identifier = "true",
+	.type = SCT_TEST,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate_const = tst_true_validate_const,
+	.control_generate = tst_true_generate
+};
+
+/*
+ * Code validation
+ */
+
+static bool tst_false_validate_const
+(struct sieve_validator *valdtr ATTR_UNUSED,
+	struct sieve_command *tst ATTR_UNUSED, int *const_current,
+	int const_next ATTR_UNUSED)
+{
+	*const_current = 0;
+	return TRUE;
+}
+
+static bool tst_true_validate_const
+(struct sieve_validator *valdtr ATTR_UNUSED,
+	struct sieve_command *tst ATTR_UNUSED, int *const_current,
+	int const_next ATTR_UNUSED)
+{
+	*const_current = 1;
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool tst_false_generate
+(const struct sieve_codegen_env *cgenv,
+	struct sieve_command *cmd ATTR_UNUSED,
+	struct sieve_jumplist *jumps, bool jump_true)
+{
+	if ( !jump_true ) {
+		sieve_operation_emit(cgenv->sblock, NULL, &sieve_jmp_operation);
+		sieve_jumplist_add(jumps, sieve_binary_emit_offset(cgenv->sblock, 0));
+	}
+
+	return TRUE;
+}
+
+static bool tst_true_generate
+(const struct sieve_codegen_env *cgenv,
+	struct sieve_command *cmd ATTR_UNUSED,
+	struct sieve_jumplist *jumps, bool jump_true)
+{
+	if ( jump_true ) {
+		sieve_operation_emit(cgenv->sblock, NULL, &sieve_jmp_operation);
+		sieve_jumplist_add(jumps, sieve_binary_emit_offset(cgenv->sblock, 0));
+	}
+
+	return TRUE;
+}
+
diff --git a/pigeonhole/src/lib-sieve/util/Makefile.am b/pigeonhole/src/lib-sieve/util/Makefile.am
new file mode 100644
index 0000000..36cad8a
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/util/Makefile.am
@@ -0,0 +1,51 @@
+noinst_LTLIBRARIES = libsieve_util.la
+
+AM_CPPFLAGS = \
+	$(LIBDOVECOT_INCLUDE) \
+	$(LIBDOVECOT_SERVICE_INCLUDE) \
+	-DMODULEDIR=\""$(dovecot_moduledir)"\"
+
+libsieve_util_la_DEPENDENCIES = $(LIBDOVECOT_STORAGE_DEPS) $(LIBDOVECOT_DEPS)
+
+libsieve_util_la_SOURCES = \
+	mail-raw.c \
+	edit-mail.c \
+	rfc2822.c
+
+headers = \
+	mail-raw.h \
+	edit-mail.h \
+	rfc2822.h
+
+pkginc_libdir=$(dovecot_pkgincludedir)/sieve
+pkginc_lib_HEADERS = $(headers)
+
+test_programs = \
+	test-edit-mail \
+	test-rfc2822
+
+noinst_PROGRAMS = $(test_programs)
+
+test_libs = \
+	libsieve_util.la \
+	$(LIBDOVECOT_STORAGE) \
+	$(LIBDOVECOT)
+test_deps = \
+	libsieve_util.la \
+	$(LIBDOVECOT_STORAGE_DEPS) \
+	$(LIBDOVECOT_DEPS)
+
+test_edit_mail_SOURCES = test-edit-mail.c
+test_edit_mail_LDADD = $(test_libs)
+test_edit_mail_DEPENDENCIES = $(test_deps)
+
+test_rfc2822_SOURCES = test-rfc2822.c
+test_rfc2822_LDADD = $(test_libs)
+test_rfc2822_DEPENDENCIES = $(test_deps)
+
+check: check-am check-test
+check-test: all-am
+	for bin in $(test_programs); do \
+	  if ! $(RUN_TEST) ./$$bin; then exit 1; fi; \
+	done
+
diff --git a/pigeonhole/src/lib-sieve/util/Makefile.in b/pigeonhole/src/lib-sieve/util/Makefile.in
new file mode 100644
index 0000000..a62ac20
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/util/Makefile.in
@@ -0,0 +1,810 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
+              "target option '$${target_option-}' specified" >&2; \
+         exit 1;; \
+  esac; \
+  has_opt=no; \
+  sane_makeflags=$$MAKEFLAGS; \
+  if $(am__is_gnu_make); then \
+    sane_makeflags=$$MFLAGS; \
+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
+        bs=\\; \
+        sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \
+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+  }; \
+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
+    case $$flg in \
+      *=*|--*) continue;; \
+        -*I) strip_trailopt 'I'; skip_next=yes;; \
+      -*I?*) strip_trailopt 'I';; \
+        -*O) strip_trailopt 'O'; skip_next=yes;; \
+      -*O?*) strip_trailopt 'O';; \
+        -*l) strip_trailopt 'l'; skip_next=yes;; \
+      -*l?*) strip_trailopt 'l';; \
+      -[dEDm]) skip_next=yes;; \
+      -[JT]) skip_next=yes;; \
+    esac; \
+    case $$flg in \
+      *$$target_option*) has_opt=yes; break;; \
+    esac; \
+  done; \
+  test $$has_opt = yes
+am__make_dryrun = (target_option=n; $(am__make_running_with_option))
+am__make_keepgoing = (target_option=k; $(am__make_running_with_option))
+pkgdatadir = $(datadir)/@PACKAGE@
+pkgincludedir = $(includedir)/@PACKAGE@
+pkglibdir = $(libdir)/@PACKAGE@
+pkglibexecdir = $(libexecdir)/@PACKAGE@
+am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd
+install_sh_DATA = $(install_sh) -c -m 644
+install_sh_PROGRAM = $(install_sh) -c
+install_sh_SCRIPT = $(install_sh) -c
+INSTALL_HEADER = $(INSTALL_DATA)
+transform = $(program_transform_name)
+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
+PRE_UNINSTALL = :
+POST_UNINSTALL = :
+build_triplet = @build@
+host_triplet = @host@
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+	done
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+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
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+distdir: $(BUILT_SOURCES)
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+
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+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
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+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
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+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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+	fi
+mostlyclean-generic:
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+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
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+	-rm -f ./$(DEPDIR)/test-edit-mail.Po
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+	  if ! $(RUN_TEST) ./$$bin; then exit 1; fi; \
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+# Otherwise a system limit (for SysV at least) may be exceeded.
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diff --git a/pigeonhole/src/lib-sieve/util/edit-mail.c b/pigeonhole/src/lib-sieve/util/edit-mail.c
new file mode 100644
index 0000000..31d941e
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/util/edit-mail.c
@@ -0,0 +1,2254 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "array.h"
+#include "str.h"
+#include "mempool.h"
+#include "llist.h"
+#include "istream-private.h"
+#include "master-service.h"
+#include "master-service-settings.h"
+#include "message-parser.h"
+#include "message-header-encode.h"
+#include "message-header-decode.h"
+#include "mail-user.h"
+#include "mail-storage-private.h"
+#include "index-mail.h"
+#include "raw-storage.h"
+
+#include "rfc2822.h"
+
+#include "edit-mail.h"
+
+/*
+ * Forward declarations
+ */
+
+struct _header_field_index;
+struct _header_field;
+struct _header_index;
+struct _header;
+
+static struct mail_vfuncs edit_mail_vfuncs;
+
+struct edit_mail_istream;
+struct istream *edit_mail_istream_create(struct edit_mail *edmail);
+
+static struct _header_index *
+edit_mail_header_clone(struct edit_mail *edmail, struct _header *header);
+
+/*
+ * Raw storage
+ */
+
+static struct mail_user *edit_mail_user = NULL;
+static unsigned int edit_mail_refcount = 0;
+
+static struct mail_user *edit_mail_raw_storage_get(struct mail_user *mail_user)
+{
+	if (edit_mail_user == NULL) {
+		void **sets =
+			master_service_settings_get_others(master_service);
+
+		edit_mail_user = raw_storage_create_from_set(
+			mail_user->set_info, sets[0]);
+	}
+
+	edit_mail_refcount++;
+
+	return edit_mail_user;
+}
+
+static void edit_mail_raw_storage_drop(void)
+{
+	i_assert(edit_mail_refcount > 0);
+
+	if (--edit_mail_refcount != 0)
+		return;
+
+	mail_user_unref(&edit_mail_user);
+	edit_mail_user = NULL;
+}
+
+/*
+ * Headers
+ */
+
+struct _header_field {
+	struct _header *header;
+
+	unsigned int refcount;
+
+	char *data;
+	size_t size;
+	size_t virtual_size;
+	uoff_t offset;
+	unsigned int lines;
+
+	uoff_t body_offset;
+
+	char *utf8_value;
+};
+
+struct _header_field_index {
+	struct _header_field_index *prev, *next;
+
+	struct _header_field *field;
+	struct _header_index *header;
+};
+
+struct _header {
+	unsigned int refcount;
+
+	char *name;
+};
+
+struct _header_index {
+	struct _header_index *prev, *next;
+
+	struct _header *header;
+
+	struct _header_field_index *first, *last;
+
+	unsigned int count;
+};
+
+static inline struct _header *_header_create(const char *name)
+{
+	struct _header *header;
+
+	header = i_new(struct _header, 1);
+	header->name = i_strdup(name);
+	header->refcount = 1;
+
+	return header;
+}
+
+static inline void _header_ref(struct _header *header)
+{
+	header->refcount++;
+}
+
+static inline void _header_unref(struct _header *header)
+{
+	i_assert(header->refcount > 0);
+	if (--header->refcount != 0)
+		return;
+
+	i_free(header->name);
+	i_free(header);
+}
+
+static inline struct _header_field *_header_field_create(struct _header *header)
+{
+	struct _header_field *hfield;
+
+	hfield = i_new(struct _header_field, 1);
+	hfield->refcount = 1;
+	hfield->header = header;
+	if (header != NULL)
+		_header_ref(header);
+
+	return hfield;
+}
+
+static inline void _header_field_ref(struct _header_field *hfield)
+{
+	hfield->refcount++;
+}
+
+static inline void _header_field_unref(struct _header_field *hfield)
+{
+	i_assert(hfield->refcount > 0);
+	if (--hfield->refcount != 0)
+		return;
+
+	if (hfield->header != NULL)
+		_header_unref(hfield->header);
+
+	if (hfield->data != NULL)
+		i_free(hfield->data);
+	if (hfield->utf8_value != NULL)
+		i_free(hfield->utf8_value);
+	i_free(hfield);
+}
+
+/*
+ * Edit mail object
+ */
+
+struct edit_mail {
+	struct mail_private mail;
+	struct mail_private *wrapped;
+
+	struct edit_mail *parent;
+	unsigned int refcount;
+
+	struct istream *wrapped_stream;
+	struct istream *stream;
+
+	struct _header_index *headers_head, *headers_tail;
+	struct _header_field_index *header_fields_head, *header_fields_tail;
+	struct message_size hdr_size, body_size;
+
+	struct message_size wrapped_hdr_size, wrapped_body_size;
+
+	struct _header_field_index *header_fields_appended;
+	struct message_size appended_hdr_size;
+
+	bool modified:1;
+	bool snapshot_modified:1;
+	bool crlf:1;
+	bool eoh_crlf:1;
+	bool headers_parsed:1;
+	bool destroying_stream:1;
+};
+
+struct edit_mail *edit_mail_wrap(struct mail *mail)
+{
+	struct mail_private *mailp = (struct mail_private *) mail;
+	struct edit_mail *edmail;
+	struct mail_user *raw_mail_user;
+	struct mailbox *raw_box = NULL;
+	struct mailbox_transaction_context *raw_trans;
+	struct message_size hdr_size, body_size;
+	struct istream *wrapped_stream;
+	uoff_t size_diff;
+	pool_t pool;
+
+	if (mail_get_stream(mail, &hdr_size, &body_size, &wrapped_stream) < 0)
+		return NULL;
+
+	/* Create dummy raw mailbox for our wrapper */
+
+	raw_mail_user = edit_mail_raw_storage_get(mail->box->storage->user);
+
+	if (raw_mailbox_alloc_stream(raw_mail_user, wrapped_stream, (time_t)-1,
+				     "editor@example.com", &raw_box) < 0) {
+		i_error("edit-mail: failed to open raw box: %s",
+			mailbox_get_last_internal_error(raw_box, NULL));
+		mailbox_free(&raw_box);
+		edit_mail_raw_storage_drop();
+		return NULL;
+	}
+
+	raw_trans = mailbox_transaction_begin(raw_box, 0, __func__);
+
+	/* Create the wrapper mail */
+
+	pool = pool_alloconly_create("edit_mail", 1024);
+	edmail = p_new(pool, struct edit_mail, 1);
+	edmail->refcount = 1;
+	edmail->mail.pool = pool;
+
+	edmail->wrapped = mailp;
+	edmail->wrapped_hdr_size = hdr_size;
+	edmail->wrapped_body_size = body_size;
+
+	edmail->wrapped_stream = wrapped_stream;
+	i_stream_ref(edmail->wrapped_stream);
+
+	/* Determine whether we should use CRLF or LF for the physical message
+	 */
+	size_diff = ((hdr_size.virtual_size + body_size.virtual_size) -
+		     (hdr_size.physical_size + body_size.physical_size));
+	if (size_diff == 0 || size_diff <= (hdr_size.lines + body_size.lines)/2)
+		edmail->crlf = edmail->eoh_crlf = TRUE;
+
+	array_create(&edmail->mail.module_contexts, pool, sizeof(void *), 5);
+
+	edmail->mail.v = edit_mail_vfuncs;
+	edmail->mail.mail.seq = 1;
+	edmail->mail.mail.box = raw_box;
+	edmail->mail.mail.transaction = raw_trans;
+	edmail->mail.wanted_fields = mailp->wanted_fields;
+	edmail->mail.wanted_headers = mailp->wanted_headers;
+
+	return edmail;
+}
+
+struct edit_mail *edit_mail_snapshot(struct edit_mail *edmail)
+{
+	struct _header_field_index *field_idx, *field_idx_new;
+	struct edit_mail *edmail_new;
+	pool_t pool;
+
+	if (!edmail->snapshot_modified)
+		return edmail;
+
+	pool = pool_alloconly_create("edit_mail", 1024);
+	edmail_new = p_new(pool, struct edit_mail, 1);
+	edmail_new->refcount = 1;
+	edmail_new->mail.pool = pool;
+
+	edmail_new->wrapped = edmail->wrapped;
+	edmail_new->wrapped_hdr_size = edmail->wrapped_hdr_size;
+	edmail_new->wrapped_body_size = edmail->wrapped_body_size;
+	edmail_new->hdr_size = edmail->hdr_size;
+	edmail_new->body_size = edmail->body_size;
+	edmail_new->appended_hdr_size = edmail->appended_hdr_size;
+
+	edmail_new->wrapped_stream = edmail->wrapped_stream;
+	i_stream_ref(edmail_new->wrapped_stream);
+
+	edmail_new->crlf = edmail->crlf;
+	edmail_new->eoh_crlf = edmail->eoh_crlf;
+
+	array_create(&edmail_new->mail.module_contexts, pool,
+		     sizeof(void *), 5);
+
+	edmail_new->mail.v = edit_mail_vfuncs;
+	edmail_new->mail.mail.seq = 1;
+	edmail_new->mail.mail.box = edmail->mail.mail.box;
+	edmail_new->mail.mail.transaction = edmail->mail.mail.transaction;
+	edmail_new->mail.wanted_fields = 	edmail->mail.wanted_fields;
+	edmail_new->mail.wanted_headers = edmail->mail.wanted_headers;
+
+	edmail_new->stream = NULL;
+
+	if (edmail->modified) {
+		field_idx = edmail->header_fields_head;
+		while (field_idx != NULL) {
+			struct _header_field_index *next = field_idx->next;
+
+			field_idx_new = i_new(struct _header_field_index, 1);
+
+			field_idx_new->header = edit_mail_header_clone(
+				edmail_new, field_idx->header->header);
+
+			field_idx_new->field = field_idx->field;
+			_header_field_ref(field_idx_new->field);
+
+			DLLIST2_APPEND(&edmail_new->header_fields_head,
+				       &edmail_new->header_fields_tail,
+				       field_idx_new);
+
+			field_idx_new->header->count++;
+			if (field_idx->header->first == field_idx)
+				field_idx_new->header->first = field_idx_new;
+			if (field_idx->header->last == field_idx)
+				field_idx_new->header->last = field_idx_new;
+
+			if (field_idx == edmail->header_fields_appended) {
+				edmail_new->header_fields_appended =
+					field_idx_new;
+			}
+
+			field_idx = next;
+		}
+
+		edmail_new->modified = TRUE;
+	}
+
+	edmail_new->headers_parsed = edmail->headers_parsed;
+	edmail_new->parent = edmail;
+
+	return edmail_new;
+}
+
+void edit_mail_reset(struct edit_mail *edmail)
+{
+	struct _header_index *header_idx;
+	struct _header_field_index *field_idx;
+
+	i_stream_unref(&edmail->stream);
+
+	field_idx = edmail->header_fields_head;
+	while (field_idx != NULL) {
+		struct _header_field_index *next = field_idx->next;
+
+		_header_field_unref(field_idx->field);
+		i_free(field_idx);
+
+		field_idx = next;
+	}
+
+	header_idx = edmail->headers_head;
+	while (header_idx != NULL) {
+		struct _header_index *next = header_idx->next;
+
+		_header_unref(header_idx->header);
+		i_free(header_idx);
+
+		header_idx = next;
+	}
+
+	edmail->modified = FALSE;
+}
+
+void edit_mail_unwrap(struct edit_mail **edmail)
+{
+	struct edit_mail *parent;
+
+	i_assert((*edmail)->refcount > 0);
+	if (--(*edmail)->refcount != 0)
+		return;
+
+	edit_mail_reset(*edmail);
+	i_stream_unref(&(*edmail)->wrapped_stream);
+
+	parent = (*edmail)->parent;
+
+	if (parent == NULL) {
+		mailbox_transaction_rollback(&(*edmail)->mail.mail.transaction);
+		mailbox_free(&(*edmail)->mail.mail.box);
+		edit_mail_raw_storage_drop();
+	}
+
+	pool_unref(&(*edmail)->mail.pool);
+	*edmail = NULL;
+
+	if (parent != NULL)
+		edit_mail_unwrap(&parent);
+}
+
+struct mail *edit_mail_get_mail(struct edit_mail *edmail)
+{
+	/* Return wrapped mail when nothing is modified yet */
+	if (!edmail->modified)
+		return &edmail->wrapped->mail;
+
+	return &edmail->mail.mail;
+}
+
+/*
+ * Editing
+ */
+
+static inline void edit_mail_modify(struct edit_mail *edmail)
+{
+	edmail->mail.mail.seq++;
+	edmail->modified = TRUE;
+	edmail->snapshot_modified = TRUE;
+}
+
+/* Header modification */
+
+static inline char *_header_value_unfold(const char *value)
+{
+	string_t *out;
+	unsigned int i;
+
+	for (i = 0; value[i] != '\0'; i++) {
+		if (value[i] == '\r' || value[i] == '\n')
+			break;
+	}
+	if (value[i] == '\0')
+		return i_strdup(value);
+
+	out = t_str_new(i + strlen(value+i) + 10);
+	str_append_data(out, value, i);
+	for (; value[i] != '\0'; i++) {
+		if (value[i] == '\n') {
+			i++;
+			if (value[i] == '\0')
+				break;
+
+			switch (value[i]) {
+			case ' ': 
+				str_append_c(out, ' ');
+				break;
+			case '\t':
+			default:
+				str_append_c(out, '\t');
+			}
+		} else {
+			if (value[i] != '\r')
+				str_append_c(out, value[i]);
+		}
+	}
+
+	return i_strndup(str_c(out), str_len(out));
+}
+
+static struct _header_index *
+edit_mail_header_find(struct edit_mail *edmail, const char *field_name)
+{
+	struct _header_index *header_idx;
+
+	header_idx = edmail->headers_head;
+	while (header_idx != NULL) {
+		if (strcasecmp(header_idx->header->name, field_name) == 0)
+			return header_idx;
+
+		header_idx = header_idx->next;
+	}
+
+	return NULL;
+}
+
+static struct _header_index *
+edit_mail_header_create(struct edit_mail *edmail, const char *field_name)
+{
+	struct _header_index *header_idx;
+
+	header_idx = edit_mail_header_find(edmail, field_name);
+	if (header_idx == NULL) {
+		header_idx = i_new(struct _header_index, 1);
+		header_idx->header = _header_create(field_name);
+
+		DLLIST2_APPEND(&edmail->headers_head, &edmail->headers_tail,
+			       header_idx);
+	}
+
+	return header_idx;
+}
+
+static struct _header_index *
+edit_mail_header_clone(struct edit_mail *edmail, struct _header *header)
+{
+	struct _header_index *header_idx;
+
+	header_idx = edmail->headers_head;
+	while (header_idx != NULL) {
+		if (header_idx->header == header)
+			return header_idx;
+
+		header_idx = header_idx->next;
+	}
+
+	header_idx = i_new(struct _header_index, 1);
+	header_idx->header = header;
+	_header_ref(header);
+	DLLIST2_APPEND(&edmail->headers_head, &edmail->headers_tail,
+		       header_idx);
+
+	return header_idx;
+}
+
+static struct _header_field_index *
+edit_mail_header_field_create(struct edit_mail *edmail, const char *field_name,
+			      const char *value)
+{
+	struct _header_index *header_idx;
+	struct _header *header;
+	struct _header_field_index *field_idx;
+	struct _header_field *field;
+	unsigned int lines;
+
+	/* Get/create header index item */
+	header_idx = edit_mail_header_create(edmail, field_name);
+	header = header_idx->header;
+
+	/* Create new field index item */
+	field_idx = i_new(struct _header_field_index, 1);
+	field_idx->header = header_idx;
+	field_idx->field = field = _header_field_create(header);
+
+	/* Create header field data (folded if necessary) */
+	T_BEGIN {
+		string_t *enc_value, *data;
+
+		enc_value = t_str_new(strlen(field_name) + strlen(value) + 64);
+		data = t_str_new(strlen(field_name) + strlen(value) + 128);
+
+		message_header_encode(value, enc_value);
+
+		lines = rfc2822_header_append(data, field_name,
+					      str_c(enc_value), edmail->crlf,
+					      &field->body_offset);
+
+		/* Copy to new field */
+		field->data = i_strndup(str_data(data), str_len(data));
+		field->size = str_len(data);
+		field->virtual_size = (edmail->crlf ?
+				       field->size : field->size + lines);
+		field->lines = lines;
+	} T_END;
+
+	/* Record original (utf8) value */
+	field->utf8_value = _header_value_unfold(value);
+
+	return field_idx;
+}
+
+static void
+edit_mail_header_field_delete(struct edit_mail *edmail,
+			      struct _header_field_index *field_idx,
+			      bool update_index)
+{
+	struct _header_index *header_idx = field_idx->header;
+	struct _header_field *field = field_idx->field;
+
+	i_assert(header_idx != NULL);
+
+	edmail->hdr_size.physical_size -= field->size;
+	edmail->hdr_size.virtual_size -= field->virtual_size;
+	edmail->hdr_size.lines -= field->lines;
+
+	header_idx->count--;
+	if (update_index) {
+		if (header_idx->count == 0) {
+			DLLIST2_REMOVE(&edmail->headers_head,
+				       &edmail->headers_tail, header_idx);
+			_header_unref(header_idx->header);
+			i_free(header_idx);
+		} else if (header_idx->first == field_idx) {
+			struct _header_field_index *hfield =
+				header_idx->first->next;
+
+			while (hfield != NULL && hfield->header != header_idx)
+				hfield = hfield->next;
+
+			i_assert(hfield != NULL);
+			header_idx->first = hfield;
+		} else if (header_idx->last == field_idx) {
+			struct _header_field_index *hfield =
+				header_idx->last->prev;
+
+			while (hfield != NULL && hfield->header != header_idx)
+				hfield = hfield->prev;
+
+			i_assert(hfield != NULL);
+			header_idx->last = hfield;
+		}
+	}
+
+	DLLIST2_REMOVE(&edmail->header_fields_head, &edmail->header_fields_tail,
+		       field_idx);
+	_header_field_unref(field_idx->field);
+	i_free(field_idx);
+}
+
+static struct _header_field_index *
+edit_mail_header_field_replace(struct edit_mail *edmail,
+			       struct _header_field_index *field_idx,
+			       const char *newname, const char *newvalue,
+			       bool update_index)
+{
+	struct _header_field_index *field_idx_new;
+	struct _header_index *header_idx = field_idx->header, *header_idx_new;
+	struct _header_field *field = field_idx->field, *field_new;
+
+	i_assert(header_idx != NULL);
+	i_assert(newname != NULL || newvalue != NULL);
+
+	if (newname == NULL)
+		newname = header_idx->header->name;
+	if (newvalue == NULL)
+		newvalue = field_idx->field->utf8_value;
+	field_idx_new = edit_mail_header_field_create(
+		edmail, newname, newvalue);
+	field_new = field_idx_new->field;
+	header_idx_new = field_idx_new->header;
+
+	edmail->hdr_size.physical_size -= field->size;
+	edmail->hdr_size.virtual_size -= field->virtual_size;
+	edmail->hdr_size.lines -= field->lines;
+
+	edmail->hdr_size.physical_size += field_new->size;
+	edmail->hdr_size.virtual_size += field_new->virtual_size;
+	edmail->hdr_size.lines += field_new->lines;
+
+	/* Replace header field index */
+	field_idx_new->prev = field_idx->prev;
+	field_idx_new->next = field_idx->next;
+	if (field_idx->prev != NULL)
+		field_idx->prev->next = field_idx_new;
+	if (field_idx->next != NULL)
+		field_idx->next->prev = field_idx_new;
+	if (edmail->header_fields_head == field_idx)
+		edmail->header_fields_head = field_idx_new;
+	if (edmail->header_fields_tail == field_idx)
+		edmail->header_fields_tail = field_idx_new;
+
+	if (header_idx_new == header_idx) {
+		if (header_idx->first == field_idx)
+			header_idx->first = field_idx_new;
+		if (header_idx->last == field_idx)
+			header_idx->last = field_idx_new;
+	} else {
+		header_idx->count--;
+		header_idx_new->count++;
+
+		if (update_index) {
+			if (header_idx->count == 0) {
+				DLLIST2_REMOVE(&edmail->headers_head,
+					       &edmail->headers_tail,
+					       header_idx);
+				_header_unref(header_idx->header);
+				i_free(header_idx);
+			} else if (header_idx->first == field_idx) {
+				struct _header_field_index *hfield =
+					header_idx->first->next;
+
+				while (hfield != NULL &&
+				       hfield->header != header_idx)
+					hfield = hfield->next;
+
+				i_assert(hfield != NULL);
+				header_idx->first = hfield;
+			} else if (header_idx->last == field_idx) {
+				struct _header_field_index *hfield =
+					header_idx->last->prev;
+
+				while (hfield != NULL &&
+				       hfield->header != header_idx)
+					hfield = hfield->prev;
+
+				i_assert(hfield != NULL);
+				header_idx->last = hfield;
+			}
+			if (header_idx_new->count > 0) {
+				struct _header_field_index *hfield;
+
+				hfield = edmail->header_fields_head;
+				while (hfield != NULL &&
+				       hfield->header != header_idx_new)
+					hfield = hfield->next;
+
+				i_assert(hfield != NULL);
+				header_idx_new->first = hfield;
+
+				hfield = edmail->header_fields_tail;
+				while (hfield != NULL &&
+				       hfield->header != header_idx_new)
+					hfield = hfield->prev;
+
+				i_assert(hfield != NULL);
+				header_idx_new->last = hfield;
+			}
+		}
+	}
+
+	_header_field_unref(field_idx->field);
+	i_free(field_idx);
+	return field_idx_new;
+}
+
+static inline char *
+_header_decode(const unsigned char *hdr_data, size_t hdr_data_len)
+{
+	string_t *str = t_str_new(512);
+
+	/* hdr_data is already unfolded */
+
+	/* Decode MIME encoded-words. */
+	message_header_decode_utf8((const unsigned char *)hdr_data,
+				   hdr_data_len, str, NULL);
+	return i_strdup(str_c(str));
+}
+
+static int edit_mail_headers_parse(struct edit_mail *edmail)
+{
+	struct message_header_parser_ctx *hparser;
+	enum message_header_parser_flags hparser_flags =
+		MESSAGE_HEADER_PARSER_FLAG_SKIP_INITIAL_LWSP |
+		MESSAGE_HEADER_PARSER_FLAG_CLEAN_ONELINE;
+	struct message_header_line *hdr;
+	struct _header_index *header_idx;
+	struct _header_field_index *head = NULL, *tail = NULL, *current;
+	string_t *hdr_data;
+	uoff_t offset = 0, body_offset = 0, vsize_diff = 0;
+	unsigned int lines = 0;
+	int ret;
+
+	if (edmail->headers_parsed)
+		return 1;
+
+	i_stream_seek(edmail->wrapped_stream, 0);
+	hparser = message_parse_header_init(edmail->wrapped_stream, NULL,
+					    hparser_flags);
+
+	T_BEGIN {
+		hdr_data = t_str_new(1024);
+		while ((ret = message_parse_header_next(hparser, &hdr)) > 0) {
+			struct _header_field_index *field_idx_new;
+			struct _header_field *field;
+
+			if (hdr->eoh) {
+				/* Record whether header ends in CRLF or LF */
+				edmail->eoh_crlf = hdr->crlf_newline;
+			}
+
+			if (hdr == NULL || hdr->eoh)
+				break;
+
+			/* Skip bad headers */
+			if (hdr->name_len == 0)
+				continue;
+			/* We deny the existence of any `Content-Length:'
+			   header. This header is non-standard and it can wreak
+			   havok when the message is modified.
+			 */
+			if (strcasecmp(hdr->name, "Content-Length" ) == 0)
+				continue;
+
+			if (hdr->continued) {
+				/* Continued line of folded header */
+				buffer_append(hdr_data, hdr->value,
+					      hdr->value_len);
+			} else {
+				/* First line of header */
+				offset = hdr->name_offset;
+				body_offset = hdr->name_len + hdr->middle_len;
+				str_truncate(hdr_data, 0);
+				buffer_append(hdr_data, hdr->name,
+					      hdr->name_len);
+				buffer_append(hdr_data, hdr->middle,
+					      hdr->middle_len);
+				buffer_append(hdr_data, hdr->value,
+					      hdr->value_len);
+				lines = 0;
+				vsize_diff = 0;
+			}
+
+			if (!hdr->no_newline) {
+				lines++;
+
+				if (hdr->crlf_newline) {
+					buffer_append(hdr_data, "\r\n", 2);
+				} else {
+					buffer_append(hdr_data, "\n", 1);
+					vsize_diff++;
+				}
+			}
+
+			if (hdr->continues) {
+				hdr->use_full_value = TRUE;
+				continue;
+			}
+
+			/* Create new header field index entry */
+
+			field_idx_new = i_new(struct _header_field_index, 1);
+
+			header_idx = edit_mail_header_create(edmail, hdr->name);
+			header_idx->count++;
+			field_idx_new->header = header_idx;
+			field_idx_new->field = field =
+				_header_field_create(header_idx->header);
+
+			i_assert(body_offset > 0);
+			field->body_offset = body_offset;
+
+			field->utf8_value = _header_decode(hdr->full_value,
+							   hdr->full_value_len);
+
+			field->size = str_len(hdr_data);
+			field->virtual_size = field->size + vsize_diff;
+			field->data = i_strndup(str_data(hdr_data),
+						field->size);
+			field->offset = offset;
+			field->lines = lines;
+
+			DLLIST2_APPEND(&head, &tail, field_idx_new);
+
+			edmail->hdr_size.physical_size += field->size;
+			edmail->hdr_size.virtual_size += field->virtual_size;
+			edmail->hdr_size.lines += lines;
+		}
+	} T_END;
+
+	message_parse_header_deinit(&hparser);
+
+	/* Blocking i/o required */
+	i_assert(ret != 0);
+
+	if (ret < 0 && edmail->wrapped_stream->stream_errno != 0) {
+		/* Error; clean up */
+		i_error("read(%s) failed: %s",
+			i_stream_get_name(edmail->wrapped_stream),
+			i_stream_get_error(edmail->wrapped_stream));
+		current = head;
+		while (current != NULL) {
+			struct _header_field_index *next = current->next;
+
+			_header_field_unref(current->field);
+			i_free(current);
+
+			current = next;
+		}
+
+		return ret;
+	}
+
+	/* Insert header field index items in main list */
+	if (head != NULL && tail != NULL) {
+		if (edmail->header_fields_appended != NULL) {
+			if (edmail->header_fields_head !=
+			    edmail->header_fields_appended) {
+				edmail->header_fields_appended->prev->next = head;
+				head->prev = edmail->header_fields_appended->prev;
+			} else {
+				edmail->header_fields_head = head;
+			}
+
+			tail->next = edmail->header_fields_appended;
+			edmail->header_fields_appended->prev = tail;
+		} else if (edmail->header_fields_tail != NULL) {
+			edmail->header_fields_tail->next = head;
+			head->prev = edmail->header_fields_tail;
+			edmail->header_fields_tail = tail;
+		} else {
+			edmail->header_fields_head = head;
+			edmail->header_fields_tail = tail;
+		}
+	}
+
+	/* Rebuild header index */
+	current = edmail->header_fields_head;
+	while (current != NULL) {
+		if (current->header->first == NULL)
+			current->header->first = current;
+		current->header->last = current;
+
+		current = current->next;
+	}
+
+	/* Clear appended headers */
+	edmail->header_fields_appended = NULL;
+	edmail->appended_hdr_size.physical_size = 0;
+	edmail->appended_hdr_size.virtual_size = 0;
+	edmail->appended_hdr_size.lines = 0;
+
+	/* Do not parse headers again */
+	edmail->headers_parsed = TRUE;
+
+	return 1;
+}
+
+void edit_mail_header_add(struct edit_mail *edmail, const char *field_name,
+			  const char *value, bool last)
+{
+	struct _header_index *header_idx;
+	struct _header_field_index *field_idx;
+	struct _header_field *field;
+
+	edit_mail_modify(edmail);
+
+	field_idx = edit_mail_header_field_create(edmail, field_name, value);
+	header_idx = field_idx->header;
+	field = field_idx->field;
+
+	/* Add it to the header field index */
+	if (last) {
+		DLLIST2_APPEND(&edmail->header_fields_head,
+			       &edmail->header_fields_tail, field_idx);
+
+		header_idx->last = field_idx;
+		if (header_idx->first == NULL)
+			header_idx->first = field_idx;
+
+		if (!edmail->headers_parsed)  {
+			if (edmail->header_fields_appended == NULL) {
+				/* Record beginning of appended headers */
+				edmail->header_fields_appended = field_idx;
+			}
+
+			edmail->appended_hdr_size.physical_size += field->size;
+			edmail->appended_hdr_size.virtual_size += field->virtual_size;
+			edmail->appended_hdr_size.lines += field->lines;
+		}
+	} else {
+		DLLIST2_PREPEND(&edmail->header_fields_head,
+				&edmail->header_fields_tail, field_idx);
+
+		header_idx->first = field_idx;
+		if (header_idx->last == NULL)
+			header_idx->last = field_idx;
+	}
+
+	header_idx->count++;
+
+	edmail->hdr_size.physical_size += field->size;
+	edmail->hdr_size.virtual_size += field->virtual_size;
+	edmail->hdr_size.lines += field->lines;
+}
+
+int edit_mail_header_delete(struct edit_mail *edmail, const char *field_name,
+			    int index)
+{
+	struct _header_index *header_idx;
+	struct _header_field_index *field_idx;
+	int pos = 0;
+	int ret = 0;
+
+	/* Make sure headers are parsed */
+	if (edit_mail_headers_parse(edmail) <= 0)
+		return -1;
+
+	/* Find the header entry */
+	header_idx = edit_mail_header_find(edmail, field_name);
+	if (header_idx == NULL) {
+		/* Not found */
+		return 0;
+	}
+
+	/* Signal modification */
+	edit_mail_modify(edmail);
+
+	/* Iterate through all header fields and remove those that match */
+	field_idx = (index >= 0 ? header_idx->first : header_idx->last);
+	while (field_idx != NULL) {
+		struct _header_field_index *next =
+			(index >= 0 ? field_idx->next : field_idx->prev);
+
+		if (field_idx->field->header == header_idx->header) {
+			bool final;
+
+			if (index >= 0) {
+				pos++;
+				final = (header_idx->last == field_idx);
+			} else {
+				pos--;
+				final = (header_idx->first == field_idx);
+			}
+
+			if (index == 0 || index == pos) {
+				if (header_idx->first == field_idx)
+					header_idx->first = NULL;
+				if (header_idx->last == field_idx)
+					header_idx->last = NULL;
+				edit_mail_header_field_delete(
+					edmail, field_idx, FALSE);
+				ret++;
+			}
+
+			if (final || (index != 0 && index == pos))
+				break;
+		}
+
+		field_idx = next;
+	}
+
+	if (index == 0 || header_idx->count == 0) {
+		DLLIST2_REMOVE(&edmail->headers_head,
+			       &edmail->headers_tail, header_idx);
+		_header_unref(header_idx->header);
+		i_free(header_idx);
+	} else if (header_idx->first == NULL || header_idx->last == NULL) {
+		struct _header_field_index *current =
+			edmail->header_fields_head;
+
+		while (current != NULL) {
+			if (current->header == header_idx) {
+				if (header_idx->first == NULL)
+					header_idx->first = current;
+				header_idx->last = current;
+			}
+			current = current->next;
+		}
+	}
+
+	return ret;
+}
+
+int edit_mail_header_replace(struct edit_mail *edmail,
+			     const char *field_name, int index,
+			     const char *newname, const char *newvalue)
+{
+	struct _header_index *header_idx, *header_idx_new;
+	struct _header_field_index *field_idx, *field_idx_new;
+	int pos = 0;
+	int ret = 0;
+
+	/* Make sure headers are parsed */
+	if (edit_mail_headers_parse(edmail) <= 0)
+		return -1;
+
+	/* Find the header entry */
+	header_idx = edit_mail_header_find(edmail, field_name);
+	if (header_idx == NULL) {
+		/* Not found */
+		return 0;
+	}
+
+	/* Signal modification */
+	edit_mail_modify(edmail);
+
+	/* Iterate through all header fields and replace those that match */
+	field_idx = (index >= 0 ? header_idx->first : header_idx->last);
+	field_idx_new = NULL;
+	while (field_idx != NULL) {
+		struct _header_field_index *next =
+			(index >= 0 ? field_idx->next : field_idx->prev);
+
+		if (field_idx->field->header == header_idx->header) {
+			bool final;
+
+			if (index >= 0) {
+				pos++;
+				final = (header_idx->last == field_idx);
+			} else {
+				pos--;
+				final = (header_idx->first == field_idx);
+			}
+
+			if (index == 0 || index == pos) {
+				if (header_idx->first == field_idx)
+					header_idx->first = NULL;
+				if (header_idx->last == field_idx)
+					header_idx->last = NULL;
+				field_idx_new = edit_mail_header_field_replace(
+					edmail, field_idx, newname, newvalue,
+					FALSE);
+				ret++;
+			}
+
+			if (final || (index != 0 && index == pos))
+				break;
+		}
+
+		field_idx = next;
+	}
+
+	/* Update old header index */
+	if (header_idx->count == 0) {
+		DLLIST2_REMOVE(&edmail->headers_head, &edmail->headers_tail,
+			       header_idx);
+		_header_unref(header_idx->header);
+		i_free(header_idx);
+	} else if (header_idx->first == NULL || header_idx->last == NULL) {
+		struct _header_field_index *current =
+			edmail->header_fields_head;
+
+		while (current != NULL) {
+			if (current->header == header_idx) {
+				if (header_idx->first == NULL)
+					header_idx->first = current;
+				header_idx->last = current;
+			}
+			current = current->next;
+		}
+	}
+
+	/* Update new header index */
+	if (field_idx_new != NULL) {
+		struct _header_field_index *current =
+			edmail->header_fields_head;
+
+		header_idx_new = field_idx_new->header;
+		while (current != NULL) {
+			if (current->header == header_idx_new) {
+				if (header_idx_new->first == NULL)
+					header_idx_new->first = current;
+				header_idx_new->last = current;
+			}
+			current = current->next;
+		}
+	}
+
+	return ret;
+}
+
+struct edit_mail_header_iter
+{
+	struct edit_mail *mail;
+	struct _header_index *header;
+	struct _header_field_index *current;
+
+	bool reverse:1;
+};
+
+int edit_mail_headers_iterate_init(struct edit_mail *edmail,
+				   const char *field_name, bool reverse,
+				   struct edit_mail_header_iter **edhiter_r)
+{
+	struct edit_mail_header_iter *edhiter;
+	struct _header_index *header_idx = NULL;
+	struct _header_field_index *current = NULL;
+
+	/* Make sure headers are parsed */
+	if (edit_mail_headers_parse(edmail) <= 0) {
+		/* Failure */
+		return -1;
+	}
+
+	header_idx = edit_mail_header_find(edmail, field_name);
+
+	if (field_name != NULL && header_idx == NULL) {
+		current = NULL;
+	} else if (!reverse) {
+		current = (header_idx != NULL ?
+			   header_idx->first : edmail->header_fields_head);
+	} else {
+		current = (header_idx != NULL ?
+			   header_idx->last : edmail->header_fields_tail);
+		if (current->header == NULL)
+			current = current->prev;
+	}
+
+	if (current ==  NULL)
+		return 0;
+
+ 	edhiter = i_new(struct edit_mail_header_iter, 1);
+	edhiter->mail = edmail;
+	edhiter->header = header_idx;
+	edhiter->reverse = reverse;
+	edhiter->current = current;
+
+	*edhiter_r = edhiter;
+	return 1;
+}
+
+void edit_mail_headers_iterate_deinit(struct edit_mail_header_iter **edhiter)
+{
+	i_free(*edhiter);
+	*edhiter = NULL;
+}
+
+void edit_mail_headers_iterate_get(struct edit_mail_header_iter *edhiter,
+				   const char **value_r)
+{
+	const char *raw;
+	int i;
+
+	i_assert(edhiter->current != NULL && edhiter->current->header != NULL);
+
+	raw = edhiter->current->field->utf8_value;
+	for (i = strlen(raw)-1; i >= 0; i--) {
+		if (raw[i] != ' ' && raw[i] != '\t')
+			break;
+	}
+
+	*value_r = t_strndup(raw, i+1);
+}
+
+bool edit_mail_headers_iterate_next(struct edit_mail_header_iter *edhiter)
+{
+	if (edhiter->current == NULL)
+		return FALSE;
+
+	do {
+		edhiter->current = (!edhiter->reverse ?
+				    edhiter->current->next :
+				    edhiter->current->prev );
+	} while (edhiter->current != NULL && edhiter->current->header != NULL &&
+		 edhiter->header != NULL &&
+		 edhiter->current->header != edhiter->header);
+
+	return (edhiter->current != NULL && edhiter->current->header != NULL);
+}
+
+bool edit_mail_headers_iterate_remove(struct edit_mail_header_iter *edhiter)
+{
+	struct _header_field_index *field_idx;
+	bool next;
+
+	i_assert(edhiter->current != NULL && edhiter->current->header != NULL);
+
+	edit_mail_modify(edhiter->mail);
+
+	field_idx = edhiter->current;
+	next = edit_mail_headers_iterate_next(edhiter);
+	edit_mail_header_field_delete(edhiter->mail, field_idx, TRUE);
+
+	return next;
+}
+
+bool edit_mail_headers_iterate_replace(struct edit_mail_header_iter *edhiter,
+				       const char *newname,
+				       const char *newvalue)
+{
+	struct _header_field_index *field_idx;
+	bool next;
+
+	i_assert(edhiter->current != NULL && edhiter->current->header != NULL);
+
+	edit_mail_modify(edhiter->mail);
+
+	field_idx = edhiter->current;
+	next = edit_mail_headers_iterate_next(edhiter);
+	edit_mail_header_field_replace(edhiter->mail, field_idx,
+				       newname, newvalue, TRUE);
+
+	return next;
+}
+
+/* Body modification */
+
+// FIXME: implement
+
+/*
+ * Mail API
+ */
+
+static void edit_mail_close(struct mail *mail)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	edmail->wrapped->v.close(&edmail->wrapped->mail);
+}
+
+static void edit_mail_free(struct mail *mail)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	edmail->wrapped->v.free(&edmail->wrapped->mail);
+
+	edit_mail_unwrap(&edmail);
+}
+
+static void
+edit_mail_set_seq(struct mail *mail ATTR_UNUSED, uint32_t seq ATTR_UNUSED,
+		  bool saving ATTR_UNUSED)
+{
+	i_panic("edit_mail_set_seq() not implemented");
+}
+
+static bool ATTR_NORETURN
+edit_mail_set_uid(struct mail *mail ATTR_UNUSED, uint32_t uid ATTR_UNUSED)
+{
+	i_panic("edit_mail_set_uid() not implemented");
+}
+
+static void edit_mail_set_uid_cache_updates(struct mail *mail, bool set)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	edmail->wrapped->v.set_uid_cache_updates(&edmail->wrapped->mail, set);
+}
+
+static void
+edit_mail_add_temp_wanted_fields(
+	struct mail *mail ATTR_UNUSED, enum mail_fetch_field fields ATTR_UNUSED,
+	struct mailbox_header_lookup_ctx *headers ATTR_UNUSED)
+{
+  /* Nothing */
+}
+
+static enum mail_flags edit_mail_get_flags(struct mail *mail)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	return edmail->wrapped->v.get_flags(&edmail->wrapped->mail);
+}
+
+static const char *const *edit_mail_get_keywords(struct mail *mail)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	return edmail->wrapped->v.get_keywords(&edmail->wrapped->mail);
+}
+
+static const ARRAY_TYPE(keyword_indexes) *
+edit_mail_get_keyword_indexes(struct mail *mail)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	return edmail->wrapped->v.get_keyword_indexes(&edmail->wrapped->mail);
+}
+
+static uint64_t edit_mail_get_modseq(struct mail *mail)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	return edmail->wrapped->v.get_modseq(&edmail->wrapped->mail);
+}
+
+static uint64_t edit_mail_get_pvt_modseq(struct mail *mail)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	return edmail->wrapped->v.get_pvt_modseq(&edmail->wrapped->mail);
+}
+
+static int edit_mail_get_parts(struct mail *mail, struct message_part **parts_r)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	return edmail->wrapped->v.get_parts(&edmail->wrapped->mail, parts_r);
+}
+
+static int
+edit_mail_get_date(struct mail *mail, time_t *date_r, int *timezone_r)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	return edmail->wrapped->v.get_date(&edmail->wrapped->mail,
+					   date_r, timezone_r);
+}
+
+static int edit_mail_get_received_date(struct mail *mail, time_t *date_r)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	return edmail->wrapped->v.get_received_date(&edmail->wrapped->mail,
+						    date_r);
+}
+
+static int edit_mail_get_save_date(struct mail *mail, time_t *date_r)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	return edmail->wrapped->v.get_save_date(&edmail->wrapped->mail, date_r);
+}
+
+static int edit_mail_get_virtual_size(struct mail *mail, uoff_t *size_r)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	if (!edmail->headers_parsed) {
+		*size_r = (edmail->wrapped_hdr_size.virtual_size +
+			   edmail->wrapped_body_size.virtual_size);
+
+		if (!edmail->modified)
+			return 0;
+	} else {
+		*size_r = edmail->wrapped_body_size.virtual_size + 2;
+	}
+
+	*size_r += (edmail->hdr_size.virtual_size +
+		    edmail->body_size.virtual_size);
+	return 0;
+}
+
+static int edit_mail_get_physical_size(struct mail *mail, uoff_t *size_r)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	*size_r = 0;
+	if (!edmail->headers_parsed) {
+		*size_r = (edmail->wrapped_hdr_size.physical_size +
+			   edmail->wrapped_body_size.physical_size);
+
+		if (!edmail->modified)
+			return 0;
+	} else {
+		*size_r = (edmail->wrapped_body_size.physical_size +
+			   (edmail->eoh_crlf ? 2 : 1));
+	}
+
+	*size_r += (edmail->hdr_size.physical_size +
+		    edmail->body_size.physical_size);
+	return 0;
+}
+
+static int
+edit_mail_get_first_header(struct mail *mail, const char *field_name,
+			   bool decode_to_utf8, const char **value_r)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+	struct _header_index *header_idx;
+	struct _header_field *field;
+	int ret;
+
+	/* Check whether mail headers were modified at all */
+	if (!edmail->modified || edmail->headers_head == NULL) {
+		/* Unmodified */
+		return edmail->wrapped->v.get_first_header(
+			&edmail->wrapped->mail, field_name, decode_to_utf8,
+			value_r);
+	}
+
+	/* Try to find modified header */
+	header_idx = edit_mail_header_find(edmail, field_name);
+	if (header_idx == NULL || header_idx->count == 0 ) {
+		if (!edmail->headers_parsed) {
+			/* No new header */
+			return edmail->wrapped->v.get_first_header(
+				&edmail->wrapped->mail, field_name,
+				decode_to_utf8, value_r);
+		}
+
+		*value_r = NULL;
+		return 0;
+	}
+
+	/* Get the first occurrence */
+	if (edmail->header_fields_appended == NULL) {
+		/* There are no appended headers, so first is found directly */
+		field = header_idx->first->field;
+	} else {
+		struct _header_field_index *field_idx;
+
+		/* Scan prepended headers */
+		field_idx = edmail->header_fields_head;
+		while (field_idx != NULL) {
+			if (field_idx->header == header_idx)
+				break;
+
+			if (field_idx == edmail->header_fields_appended) {
+				field_idx = NULL;
+				break;
+			}
+			field_idx = field_idx->next;
+		}
+
+		if (field_idx == NULL) {
+			/* Check original message */
+			ret = edmail->wrapped->v.get_first_header(
+				&edmail->wrapped->mail, field_name,
+				decode_to_utf8, value_r);
+			if (ret != 0)
+				return ret;
+
+			/* Use first (apparently appended) header */
+			field = header_idx->first->field;
+		} else {
+			field = field_idx->field;
+		}
+	}
+
+	if (decode_to_utf8)
+		*value_r = field->utf8_value;
+	else
+		*value_r = (const char *)(field->data + field->body_offset);
+	return 1;
+}
+
+static int
+edit_mail_get_headers(struct mail *mail, const char *field_name,
+		      bool decode_to_utf8, const char *const **value_r)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+	struct _header_index *header_idx;
+	struct _header_field_index *field_idx;
+	const char *const *headers;
+	ARRAY(const char *) header_values;
+
+	if (!edmail->modified || edmail->headers_head == NULL) {
+		/* Unmodified */
+		return edmail->wrapped->v.get_headers(
+			&edmail->wrapped->mail, field_name, decode_to_utf8,
+			value_r);
+	}
+
+	header_idx = edit_mail_header_find(edmail, field_name);
+	if (header_idx == NULL || header_idx->count == 0 ) {
+		if (!edmail->headers_parsed) {
+			/* No new header */
+			return edmail->wrapped->v.get_headers(
+				&edmail->wrapped->mail, field_name,
+				decode_to_utf8, value_r);
+		}
+
+		p_array_init(&header_values, edmail->mail.pool, 1);
+		(void)array_append_space(&header_values);
+		*value_r = array_idx(&header_values, 0);
+		return 0;
+	}
+
+	/* Merge */
+
+	/* Read original headers too if message headers are not parsed */
+	headers = NULL;
+	if (!edmail->headers_parsed &&
+	    edmail->wrapped->v.get_headers(&edmail->wrapped->mail, field_name,
+					   decode_to_utf8, &headers) < 0)
+		return -1;
+
+	/* Fill result array */
+	p_array_init(&header_values, edmail->mail.pool, 32);
+	field_idx = header_idx->first;
+	while (field_idx != NULL) {
+		/* If current field is the first appended one, we need to add
+		   original headers first.
+		 */
+		if (field_idx == edmail->header_fields_appended &&
+		    headers != NULL) {
+			while (*headers != NULL) {
+				array_append(&header_values, headers, 1);
+				headers++;
+			}
+		}
+
+		/* Add modified header to the list */
+		if (field_idx->field->header == header_idx->header) {
+			struct _header_field *field = field_idx->field;
+
+			const char *value;
+			if (decode_to_utf8)
+				value = field->utf8_value;
+			else {
+				value = (const char *)(field->data +
+						       field->body_offset);
+			}
+
+			array_append(&header_values, &value, 1);
+
+			if (field_idx == header_idx->last)
+				break;
+		}
+
+		field_idx = field_idx->next;
+	}
+
+	/* Add original headers if necessary */
+	if (headers != NULL) {
+		while (*headers != NULL) {
+			array_append(&header_values, headers, 1);
+			headers++;
+		}
+	}
+
+	(void)array_append_space(&header_values);
+	*value_r = array_idx(&header_values, 0);
+	return 1;
+}
+
+static int ATTR_NORETURN
+edit_mail_get_header_stream(
+	struct mail *mail ATTR_UNUSED,
+	struct mailbox_header_lookup_ctx *headers ATTR_UNUSED,
+	struct istream **stream_r ATTR_UNUSED)
+{
+	// FIXME: implement!
+	i_panic("edit_mail_get_header_stream() not implemented");
+}
+
+static int
+edit_mail_get_stream(struct mail *mail, bool get_body ATTR_UNUSED,
+		     struct message_size *hdr_size,
+		     struct message_size *body_size, struct istream **stream_r)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	if (edmail->stream == NULL)
+		edmail->stream = edit_mail_istream_create(edmail);
+
+	if (hdr_size != NULL) {
+		*hdr_size = edmail->wrapped_hdr_size;
+		hdr_size->physical_size += edmail->hdr_size.physical_size;
+		hdr_size->virtual_size += edmail->hdr_size.virtual_size;
+		hdr_size->lines += edmail->hdr_size.lines;
+	}
+
+	if (body_size != NULL)
+		*body_size = edmail->wrapped_body_size;
+
+	*stream_r = edmail->stream;
+	i_stream_seek(edmail->stream, 0);
+
+	return 0;
+}
+
+static int
+edit_mail_get_special(struct mail *mail, enum mail_fetch_field field,
+		      const char **value_r)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	if (edmail->modified) {
+		/* Block certain fields when modified */
+
+		switch (field) {
+		case MAIL_FETCH_GUID:
+			/* This is in essence a new message */
+			*value_r = "";
+			return 0;
+		case MAIL_FETCH_STORAGE_ID:
+			/* Prevent hardlink copying */
+			*value_r = "";
+			return 0;
+		default:
+			break;
+		}
+	}
+
+	return edmail->wrapped->v.get_special(&edmail->wrapped->mail,
+					      field, value_r);
+}
+
+static int
+edit_mail_get_backend_mail(struct mail *mail, struct mail **real_mail_r)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	*real_mail_r = edit_mail_get_mail(edmail);
+	return 0;
+}
+
+static void
+edit_mail_update_flags(struct mail *mail, enum modify_type modify_type,
+		       enum mail_flags flags)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	edmail->wrapped->v.update_flags(&edmail->wrapped->mail,
+					modify_type, flags);
+}
+
+static void
+edit_mail_update_keywords(struct mail *mail, enum modify_type modify_type,
+			  struct mail_keywords *keywords)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	edmail->wrapped->v.update_keywords(&edmail->wrapped->mail,
+					   modify_type, keywords);
+}
+
+static void edit_mail_update_modseq(struct mail *mail, uint64_t min_modseq)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	edmail->wrapped->v.update_modseq(&edmail->wrapped->mail, min_modseq);
+}
+
+static void
+edit_mail_update_pvt_modseq(struct mail *mail, uint64_t min_pvt_modseq)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	edmail->wrapped->v.update_pvt_modseq(&edmail->wrapped->mail,
+					     min_pvt_modseq);
+}
+
+static void edit_mail_update_pop3_uidl(struct mail *mail, const char *uidl)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	if (edmail->wrapped->v.update_pop3_uidl != NULL) {
+		edmail->wrapped->v.update_pop3_uidl(
+			&edmail->wrapped->mail, uidl);
+	}
+}
+
+static void edit_mail_expunge(struct mail *mail ATTR_UNUSED)
+{
+	/* NOOP */
+}
+
+static void
+edit_mail_set_cache_corrupted(struct mail *mail, enum mail_fetch_field field,
+			      const char *reason)
+{
+	struct edit_mail *edmail = (struct edit_mail *)mail;
+
+	edmail->wrapped->v.set_cache_corrupted(&edmail->wrapped->mail,
+					       field, reason);
+}
+
+static struct mail_vfuncs edit_mail_vfuncs = {
+	edit_mail_close,
+	edit_mail_free,
+	edit_mail_set_seq,
+	edit_mail_set_uid,
+	edit_mail_set_uid_cache_updates,
+	NULL,
+	NULL,
+	edit_mail_add_temp_wanted_fields,
+	edit_mail_get_flags,
+	edit_mail_get_keywords,
+	edit_mail_get_keyword_indexes,
+	edit_mail_get_modseq,
+	edit_mail_get_pvt_modseq,
+	edit_mail_get_parts,
+	edit_mail_get_date,
+	edit_mail_get_received_date,
+	edit_mail_get_save_date,
+	edit_mail_get_virtual_size,
+	edit_mail_get_physical_size,
+	edit_mail_get_first_header,
+	edit_mail_get_headers,
+	edit_mail_get_header_stream,
+	edit_mail_get_stream,
+	index_mail_get_binary_stream,
+	edit_mail_get_special,
+	edit_mail_get_backend_mail,
+	edit_mail_update_flags,
+	edit_mail_update_keywords,
+	edit_mail_update_modseq,
+	edit_mail_update_pvt_modseq,
+	edit_mail_update_pop3_uidl,
+	edit_mail_expunge,
+	edit_mail_set_cache_corrupted,
+	NULL,
+};
+
+/*
+ * Edit Mail Stream
+ */
+
+struct edit_mail_istream {
+	struct istream_private istream;
+	pool_t pool;
+
+	struct edit_mail *mail;
+
+	struct _header_field_index *cur_header;
+	uoff_t cur_header_v_offset;
+
+	bool parent_buffer:1;
+	bool header_read:1;
+	bool eof:1;
+};
+
+static void edit_mail_istream_destroy(struct iostream_private *stream)
+{
+	struct edit_mail_istream *edstream =
+		(struct edit_mail_istream *)stream;
+
+	i_stream_unref(&edstream->istream.parent);
+	i_stream_free_buffer(&edstream->istream);
+	pool_unref(&edstream->pool);
+}
+
+static ssize_t
+merge_from_parent(struct edit_mail_istream *edstream, uoff_t parent_v_offset,
+		  uoff_t parent_end_v_offset, uoff_t copy_v_offset)
+{
+	struct istream_private *stream = &edstream->istream;
+	uoff_t v_offset, append_v_offset;
+	const unsigned char *data;
+	size_t pos, cur_pos, parent_bytes_left;
+	bool parent_buffer = edstream->parent_buffer;
+	ssize_t ret;
+
+	i_assert(parent_v_offset <= parent_end_v_offset);
+	edstream->parent_buffer = FALSE;
+
+	v_offset = stream->istream.v_offset;
+	if (v_offset >= copy_v_offset) {
+		i_assert((v_offset - copy_v_offset) <= parent_end_v_offset);
+		if ((v_offset - copy_v_offset) == parent_end_v_offset) {
+			/* Parent data is all read */
+			return 0;
+		}
+	}
+
+	/* Determine where we are appending more data to the stream */
+	append_v_offset = v_offset + (stream->pos - stream->skip);
+
+	if (v_offset >= copy_v_offset) {
+		/* Parent buffer used */
+		cur_pos = (stream->pos - stream->skip);
+		parent_v_offset += (v_offset - copy_v_offset);
+	} else {
+		cur_pos = 0;
+		i_assert(append_v_offset >= copy_v_offset);
+		parent_v_offset += (append_v_offset - copy_v_offset);
+	}
+
+	/* Seek parent to required position */
+	i_stream_seek(stream->parent, parent_v_offset);
+
+	/* Read from parent */
+	data = i_stream_get_data(stream->parent, &pos);
+	if (pos > cur_pos)
+		ret = 0;
+	else do {
+		/* Use normal read here, since parent data can be returned
+		   directly to caller. */
+		ret = i_stream_read(stream->parent);
+
+		stream->istream.stream_errno = stream->parent->stream_errno;
+		stream->istream.eof = stream->parent->eof;
+		edstream->eof = stream->parent->eof;
+		data = i_stream_get_data(stream->parent, &pos);
+		/* Check again, in case the parent stream had been seeked
+		   backwards and the previous read() didn't get us far
+		   enough. */
+	} while (pos <= cur_pos && ret > 0);
+
+	/* Don't read beyond parent end offset */
+	if (parent_end_v_offset != (uoff_t)-1) {
+		parent_bytes_left = (size_t)(parent_end_v_offset -
+					     parent_v_offset);
+		if (pos >= parent_bytes_left) {
+			pos = parent_bytes_left;
+		}
+	}
+
+	if (v_offset < copy_v_offset || ret == -2 ||
+	    (parent_buffer && (append_v_offset + 1) >= parent_end_v_offset)) {
+		/* Merging with our local buffer; copying data from parent */
+		if (pos > 0) {
+			size_t avail;
+
+			if (parent_buffer) {
+				stream->pos = stream->skip = 0;
+				stream->buffer = NULL;
+			}
+			if (!i_stream_try_alloc(stream, pos, &avail))
+				return -2;
+			pos = (pos > avail ? avail : pos);
+
+			memcpy(stream->w_buffer + stream->pos, data, pos);
+			stream->pos += pos;
+			stream->buffer = stream->w_buffer;
+
+			if (cur_pos >= pos)
+				ret = 0;
+			else
+				ret = (ssize_t)(pos - cur_pos);
+		} else {
+			ret = (ret == 0 ? 0 : -1);
+		}
+	} else {
+		/* Just passing buffers from parent; no copying */
+		ret = (pos > cur_pos ?
+		       (ssize_t)(pos - cur_pos) : (ret == 0 ? 0 : -1));
+		stream->buffer = data;
+		stream->pos = pos;
+		stream->skip = 0;
+		edstream->parent_buffer = TRUE;
+	}
+
+	i_assert(ret != -1 || stream->istream.eof ||
+		 stream->istream.stream_errno != 0);
+	return ret;
+}
+
+static ssize_t merge_modified_headers(struct edit_mail_istream *edstream)
+{
+	struct istream_private *stream = &edstream->istream;
+	struct edit_mail *edmail = edstream->mail;
+	uoff_t v_offset = stream->istream.v_offset, append_v_offset;
+	size_t appended, written, avail, size;
+
+	if (edstream->cur_header == NULL) {
+		/* No (more) headers */
+		return 0;
+	}
+
+	/* Caller must already have committed remaining parent data to
+	   our stream buffer. */
+	i_assert(!edstream->parent_buffer);
+
+	/* Add modified headers to buffer */
+	written = 0;
+	while (edstream->cur_header != NULL) {
+		size_t wsize;
+
+		/* Determine what part of the header was already buffered */
+		append_v_offset = v_offset + (stream->pos - stream->skip);
+		i_assert(append_v_offset >= edstream->cur_header_v_offset);
+		if (append_v_offset >= edstream->cur_header_v_offset)
+			appended = (size_t)(append_v_offset -
+					    edstream->cur_header_v_offset);
+		else
+			appended = 0;
+		i_assert(appended <= edstream->cur_header->field->size);
+
+		/* Determine how much we want to write */
+		size = edstream->cur_header->field->size - appended;
+		if (size > 0) {
+			/* Determine how much we can write */
+			if (!i_stream_try_alloc(stream, size, &avail)) {
+				if (written == 0)
+					return -2;
+				break;
+			}
+			wsize = (size >= avail ? avail : size);
+
+			/* Write (part of) the header to buffer */
+			memcpy(stream->w_buffer + stream->pos,
+			       edstream->cur_header->field->data + appended,
+			       wsize);
+			stream->pos += wsize;
+			stream->buffer = stream->w_buffer;
+			written += wsize;
+
+			if (wsize < size) {
+				/* Could not write whole header; finish here */
+				break;
+			}
+		}
+
+		/* Skip to next header */
+		edstream->cur_header_v_offset +=
+			edstream->cur_header->field->size;
+		edstream->cur_header = edstream->cur_header->next;
+
+		/* Stop at end of prepended headers if original header is left
+		   unparsed */
+		if (!edmail->headers_parsed &&
+		    edstream->cur_header == edmail->header_fields_appended)
+			edstream->cur_header = NULL;
+	}
+
+	if (edstream->cur_header == NULL) {
+		/* Clear offset too, just to be tidy */
+		edstream->cur_header_v_offset = 0;
+	}
+
+	i_assert(written > 0);
+	return (ssize_t)written;
+}
+
+static ssize_t edit_mail_istream_read(struct istream_private *stream)
+{
+	struct edit_mail_istream *edstream =
+		(struct edit_mail_istream *)stream;
+	struct edit_mail *edmail = edstream->mail;
+	uoff_t v_offset, append_v_offset;
+	uoff_t parent_v_offset, parent_end_v_offset, copy_v_offset;
+	uoff_t prep_hdr_size, hdr_size;
+	ssize_t ret = 0;
+
+	if (edstream->eof) {
+		stream->istream.eof = TRUE;
+		return -1;
+	}
+
+	if (edstream->parent_buffer && stream->skip == stream->pos) {
+		edstream->parent_buffer = FALSE;
+		stream->pos = stream->skip = 0;
+		stream->buffer = NULL;
+	}
+
+	/* Merge prepended headers */
+	if (!edstream->parent_buffer) {
+		ret = merge_modified_headers(edstream);
+		if (ret != 0)
+			return ret;
+	}
+	v_offset = stream->istream.v_offset;
+	append_v_offset = v_offset + (stream->pos - stream->skip);
+
+	if (!edmail->headers_parsed && edmail->header_fields_appended != NULL &&
+	    !edstream->header_read) {
+		/* Output headers from original stream */
+
+		/* Size of the prepended header */
+		i_assert(edmail->hdr_size.physical_size >=
+			 edmail->appended_hdr_size.physical_size);
+		prep_hdr_size = (edmail->hdr_size.physical_size -
+				 edmail->appended_hdr_size.physical_size);
+
+		/* Calculate offset of header end or appended header. Any final
+		   CR is dealt with later.
+		 */
+		hdr_size = (prep_hdr_size +
+			    edmail->wrapped_hdr_size.physical_size);
+		i_assert(hdr_size > 0);
+		if (append_v_offset <= (hdr_size - 1) &&
+		    edmail->wrapped_hdr_size.physical_size > 0) {
+			parent_v_offset = stream->parent_start_offset;
+			parent_end_v_offset =
+				(stream->parent_start_offset +
+				 edmail->wrapped_hdr_size.physical_size - 1);
+			copy_v_offset = prep_hdr_size;
+
+			ret = merge_from_parent(edstream, parent_v_offset,
+						parent_end_v_offset,
+						copy_v_offset);
+			if (ret < 0)
+				return ret;
+			append_v_offset = (v_offset +
+					   (stream->pos - stream->skip));
+			i_assert(append_v_offset <= hdr_size - 1);
+
+			if (append_v_offset == hdr_size - 1) {
+				/* Strip final CR too when it is present */
+				if (stream->buffer != NULL &&
+				    stream->buffer[stream->pos-1] == '\r') {
+					stream->pos--;
+					append_v_offset--;
+					ret--;
+				}
+
+				i_assert(ret >= 0);
+				edstream->cur_header =
+					edmail->header_fields_appended;
+				edstream->cur_header_v_offset = append_v_offset;
+				if (!edstream->parent_buffer)
+					edstream->header_read = TRUE;
+			}
+
+			if (ret != 0)
+				return ret;
+		} else {
+			edstream->header_read = TRUE;
+		}
+
+		/* Merge appended headers */
+		ret = merge_modified_headers(edstream);
+		if (ret != 0)
+			return ret;
+	}
+
+	/* Header does not come from original mail at all */
+	if (edmail->headers_parsed) {
+		parent_v_offset = (stream->parent_start_offset +
+				   edmail->wrapped_hdr_size.physical_size -
+				   (edmail->eoh_crlf ? 2 : 1));
+		copy_v_offset = edmail->hdr_size.physical_size;
+	/* Header comes partially from original mail and headers are added
+	   between header and body. */
+	} else if (edmail->header_fields_appended != NULL) {
+		parent_v_offset = (stream->parent_start_offset +
+				   edmail->wrapped_hdr_size.physical_size -
+				   (edmail->eoh_crlf ? 2 : 1));
+		copy_v_offset = (edmail->hdr_size.physical_size +
+				 edmail->wrapped_hdr_size.physical_size -
+				 (edmail->eoh_crlf ? 2 : 1));
+	/* Header comes partially from original mail, but headers are only
+	   prepended. */
+	} else {
+		parent_v_offset = stream->parent_start_offset;
+		copy_v_offset = edmail->hdr_size.physical_size;
+	}
+
+	return merge_from_parent(edstream, parent_v_offset, (uoff_t)-1,
+				 copy_v_offset);
+}
+
+static void
+stream_reset_to(struct edit_mail_istream *edstream, uoff_t v_offset)
+{
+	edstream->istream.istream.v_offset = v_offset;
+	edstream->istream.skip = 0;
+	edstream->istream.pos = 0;
+	edstream->istream.buffer = NULL;
+	edstream->parent_buffer = FALSE;
+	edstream->eof = FALSE;
+	i_stream_seek(edstream->istream.parent, 0);
+}
+
+static void
+edit_mail_istream_seek(struct istream_private *stream, uoff_t v_offset,
+		       bool mark ATTR_UNUSED)
+{
+	struct edit_mail_istream *edstream =
+		(struct edit_mail_istream *)stream;
+	struct _header_field_index *cur_header;
+	struct edit_mail *edmail = edstream->mail;
+	uoff_t offset;
+
+	edstream->header_read = FALSE;
+	edstream->cur_header = NULL;
+	edstream->cur_header_v_offset = 0;
+
+	/* The beginning */
+	if (v_offset == 0) {
+		stream_reset_to(edstream, 0);
+
+		if (edmail->header_fields_head !=
+		    edmail->header_fields_appended)
+			edstream->cur_header = edmail->header_fields_head;
+		return;
+	}
+
+	/* Inside (prepended) headers */
+	if (edmail->headers_parsed) {
+		offset = edmail->hdr_size.physical_size;
+	} else {
+		offset = (edmail->hdr_size.physical_size -
+			  edmail->appended_hdr_size.physical_size);
+	}
+
+	if (v_offset < offset) {
+		stream_reset_to(edstream, v_offset);
+
+		/* Find the header */
+		cur_header = edmail->header_fields_head;
+		i_assert(cur_header != NULL &&
+			 cur_header != edmail->header_fields_appended);
+		edstream->cur_header_v_offset = 0;
+		offset = cur_header->field->size;
+		while (v_offset > offset) {
+			cur_header = cur_header->next;
+			i_assert(cur_header != NULL &&
+				 cur_header != edmail->header_fields_appended);
+
+			edstream->cur_header_v_offset = offset;
+			offset += cur_header->field->size;
+		}
+
+		edstream->cur_header = cur_header;
+		return;
+	}
+
+	if (!edmail->headers_parsed) {
+		/* Inside original header */
+		offset = (edmail->hdr_size.physical_size -
+			  edmail->appended_hdr_size.physical_size +
+			  edmail->wrapped_hdr_size.physical_size);
+		if (v_offset < offset) {
+			stream_reset_to(edstream, v_offset);
+			return;
+		}
+
+		edstream->header_read = TRUE;
+
+		/* Inside appended header */
+		offset = (edmail->hdr_size.physical_size +
+			  edmail->wrapped_hdr_size.physical_size);
+		if (v_offset < offset) {
+			stream_reset_to(edstream, v_offset);
+
+			offset -= edmail->appended_hdr_size.physical_size;
+
+			cur_header = edmail->header_fields_appended;
+			i_assert(cur_header != NULL);
+			edstream->cur_header_v_offset = offset;
+			offset += cur_header->field->size;
+
+			while (v_offset > offset) {
+				cur_header = cur_header->next;
+				i_assert(cur_header != NULL);
+
+				edstream->cur_header_v_offset = offset;
+				offset += cur_header->field->size;
+			}
+
+			edstream->cur_header = cur_header;
+			return;
+		}
+	}
+
+	stream_reset_to(edstream, v_offset);
+	edstream->cur_header = NULL;
+}
+
+static void ATTR_NORETURN
+edit_mail_istream_sync(struct istream_private *stream ATTR_UNUSED)
+{
+	i_panic("edit-mail istream sync() not implemented");
+}
+
+static int
+edit_mail_istream_stat(struct istream_private *stream, bool exact)
+{
+	struct edit_mail_istream *edstream =
+		(struct edit_mail_istream *)stream;
+	struct edit_mail *edmail = edstream->mail;
+	const struct stat *st;
+
+	/* Stat the original stream */
+	if (i_stream_stat(stream->parent, exact, &st) < 0)
+		return -1;
+
+	stream->statbuf = *st;
+	if (st->st_size == -1 || !exact)
+		return 0;
+
+	if (!edmail->headers_parsed) {
+		if (!edmail->modified)
+			return 0;
+	} else {
+		stream->statbuf.st_size =
+			(edmail->wrapped_body_size.physical_size +
+			 (edmail->eoh_crlf ? 2 : 1));
+	}
+
+	stream->statbuf.st_size += (edmail->hdr_size.physical_size +
+				    edmail->body_size.physical_size);
+	return 0;
+}
+
+struct istream *edit_mail_istream_create(struct edit_mail *edmail)
+{
+	struct edit_mail_istream *edstream;
+	struct istream *wrapped = edmail->wrapped_stream;
+
+	edstream = i_new(struct edit_mail_istream, 1);
+	edstream->pool = pool_alloconly_create(MEMPOOL_GROWING
+					       "edit mail stream", 4096);
+	edstream->mail = edmail;
+
+	edstream->istream.max_buffer_size =
+		wrapped->real_stream->max_buffer_size;
+
+	edstream->istream.iostream.destroy = edit_mail_istream_destroy;
+	edstream->istream.read = edit_mail_istream_read;
+	edstream->istream.seek = edit_mail_istream_seek;
+	edstream->istream.sync = edit_mail_istream_sync;
+	edstream->istream.stat = edit_mail_istream_stat;
+
+	edstream->istream.istream.readable_fd = FALSE;
+	edstream->istream.istream.blocking = wrapped->blocking;
+	edstream->istream.istream.seekable = wrapped->seekable;
+
+	if (edmail->header_fields_head != edmail->header_fields_appended)
+		edstream->cur_header = edmail->header_fields_head;
+
+	i_stream_seek(wrapped, 0);
+
+	return i_stream_create(&edstream->istream, wrapped, -1, 0);
+}
diff --git a/pigeonhole/src/lib-sieve/util/edit-mail.h b/pigeonhole/src/lib-sieve/util/edit-mail.h
new file mode 100644
index 0000000..14d2eaa
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/util/edit-mail.h
@@ -0,0 +1,47 @@
+#ifndef EDIT_MAIL_H
+#define EDIT_MAIL_H
+
+struct edit_mail;
+
+struct edit_mail *edit_mail_wrap(struct mail *mail);
+void edit_mail_unwrap(struct edit_mail **edmail);
+struct edit_mail *edit_mail_snapshot(struct edit_mail *edmail);
+
+void edit_mail_reset(struct edit_mail *edmail);
+
+struct mail *edit_mail_get_mail(struct edit_mail *edmail);
+
+/*
+ * Header modification
+ */
+
+/* Simple API */
+
+void edit_mail_header_add(struct edit_mail *edmail, const char *field_name,
+			  const char *value, bool last);
+int edit_mail_header_delete(struct edit_mail *edmail,
+			    const char *field_name, int index);
+int edit_mail_header_replace(struct edit_mail *edmail,
+			     const char *field_name, int index,
+			     const char *newname, const char *newvalue);
+
+/* Iterator */
+
+struct edit_mail_header_iter;
+
+int edit_mail_headers_iterate_init(struct edit_mail *edmail,
+				   const char *field_name, bool reverse,
+				   struct edit_mail_header_iter **edhiter_r);
+void edit_mail_headers_iterate_deinit(struct edit_mail_header_iter **edhiter);
+
+void edit_mail_headers_iterate_get(struct edit_mail_header_iter *edhiter,
+				   const char **value_r);
+
+bool edit_mail_headers_iterate_next(struct edit_mail_header_iter *edhiter);
+
+bool edit_mail_headers_iterate_remove(struct edit_mail_header_iter *edhiter);
+bool edit_mail_headers_iterate_replace(struct edit_mail_header_iter *edhiter,
+				       const char *newname,
+				       const char *newvalue);
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/util/mail-raw.c b/pigeonhole/src/lib-sieve/util/mail-raw.c
new file mode 100644
index 0000000..b357fe1
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/util/mail-raw.c
@@ -0,0 +1,247 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "istream.h"
+#include "istream-seekable.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "strescape.h"
+#include "safe-mkstemp.h"
+#include "path-util.h"
+#include "message-address.h"
+#include "mbox-from.h"
+#include "raw-storage.h"
+#include "mail-namespace.h"
+#include "master-service.h"
+#include "master-service-settings.h"
+#include "settings-parser.h"
+#include "mail-raw.h"
+
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <pwd.h>
+
+/*
+ * Configuration
+ */
+
+#define DEFAULT_ENVELOPE_SENDER "MAILER-DAEMON"
+
+/* After buffer grows larger than this, create a temporary file to /tmp
+   where to read the mail. */
+#define MAIL_MAX_MEMORY_BUFFER (1024*128)
+
+static const char *wanted_headers[] = {
+	"From", "Message-ID", "Subject", "Return-Path",
+	NULL
+};
+
+/*
+ * Global data
+ */
+
+struct mail_raw_user {
+	struct mail_namespace *ns;
+	struct mail_user *mail_user;
+};
+
+/*
+ * Raw mail implementation
+ */
+
+static int seekable_fd_callback
+(const char **path_r, void *context)
+{
+	struct mail_user *ruser = (struct mail_user *)context;
+	string_t *path;
+	int fd;
+
+	path = t_str_new(128);
+	mail_user_set_get_temp_prefix(path, ruser->set);
+	fd = safe_mkstemp(path, 0600, (uid_t)-1, (gid_t)-1);
+	if (fd == -1) {
+		i_error("safe_mkstemp(%s) failed: %m", str_c(path));
+		return -1;
+	}
+
+	/* we just want the fd, unlink it */
+	if (i_unlink(str_c(path)) < 0) {
+		/* shouldn't happen.. */
+		i_close_fd(&fd);
+		return -1;
+	}
+
+	*path_r = str_c(path);
+	return fd;
+}
+
+static struct istream *mail_raw_create_stream
+(struct mail_user *ruser, int fd, time_t *mtime_r, const char **sender)
+{
+	struct istream *input, *input2, *input_list[2];
+	const unsigned char *data;
+	size_t i, size;
+	int ret, tz;
+	char *env_sender = NULL;
+
+	*mtime_r = (time_t)-1;
+	fd_set_nonblock(fd, FALSE);
+
+	input = i_stream_create_fd(fd, 4096);
+	input->blocking = TRUE;
+	/* If input begins with a From-line, drop it */
+	ret = i_stream_read_bytes(input, &data, &size, 5);
+	if (ret > 0 && memcmp(data, "From ", 5) == 0) {
+		/* skip until the first LF */
+		i_stream_skip(input, 5);
+		while ( i_stream_read_more(input, &data, &size) > 0 ) {
+			for (i = 0; i < size; i++) {
+				if (data[i] == '\n')
+					break;
+			}
+			if (i != size) {
+				(void)mbox_from_parse(data, i, mtime_r, &tz, &env_sender);
+				i_stream_skip(input, i + 1);
+				break;
+			}
+			i_stream_skip(input, size);
+		}
+	}
+
+	if (env_sender != NULL && sender != NULL) {
+		*sender = t_strdup(env_sender);
+	}
+	i_free(env_sender);
+
+	if (input->v_offset == 0) {
+		input2 = input;
+		i_stream_ref(input2);
+	} else {
+		input2 = i_stream_create_limit(input, (uoff_t)-1);
+	}
+	i_stream_unref(&input);
+
+	input_list[0] = input2; input_list[1] = NULL;
+	input = i_stream_create_seekable(input_list, MAIL_MAX_MEMORY_BUFFER,
+		seekable_fd_callback, (void*)ruser);
+	i_stream_unref(&input2);
+	return input;
+}
+
+/*
+ * Init/Deinit
+ */
+
+struct mail_user *mail_raw_user_create
+(struct master_service *service, struct mail_user *mail_user)
+{
+	void **sets = master_service_settings_get_others(service);
+
+	return raw_storage_create_from_set(mail_user->set_info, sets[0]);
+}
+
+/*
+ * Open raw mail data
+ */
+
+static struct mail_raw *mail_raw_create
+(struct mail_user *ruser, struct istream *input,
+	const char *mailfile, const char *sender, time_t mtime)
+{
+	struct mail_raw *mailr;
+	struct mailbox_header_lookup_ctx *headers_ctx;
+	const char *envelope_sender, *error;
+	int ret;
+
+	if ( mailfile != NULL && *mailfile != '/' )
+		if (t_abspath(mailfile, &mailfile, &error) < 0)
+			i_fatal("t_abspath(%s) failed: %s",
+				mailfile, error);
+
+	mailr = i_new(struct mail_raw, 1);
+
+	envelope_sender = sender != NULL ? sender : DEFAULT_ENVELOPE_SENDER;
+	if ( mailfile == NULL ) {
+		ret = raw_mailbox_alloc_stream(ruser, input, mtime,
+					       envelope_sender, &mailr->box);
+	} else {
+		ret = raw_mailbox_alloc_path(ruser, mailfile, (time_t)-1,
+					     envelope_sender, &mailr->box);
+	}
+
+	if ( ret < 0 ) {
+		if ( mailfile == NULL ) {
+			i_fatal("Can't open delivery mail as raw: %s",
+				mailbox_get_last_internal_error(mailr->box, NULL));
+		} else {
+			i_fatal("Can't open delivery mail as raw (file=%s): %s",
+				mailfile, mailbox_get_last_internal_error(mailr->box, NULL));
+		}
+	}
+
+	mailr->trans = mailbox_transaction_begin(mailr->box, 0, __func__);
+	headers_ctx = mailbox_header_lookup_init(mailr->box, wanted_headers);
+	mailr->mail = mail_alloc(mailr->trans, 0, headers_ctx);
+	mailbox_header_lookup_unref(&headers_ctx);
+	mail_set_seq(mailr->mail, 1);
+
+	return mailr;
+}
+
+struct mail_raw *mail_raw_open_stream
+(struct mail_user *ruser, struct istream *input)
+{
+	struct mail_raw *mailr;
+
+	i_assert(input->seekable);
+	i_stream_set_name(input, "data");
+	mailr = mail_raw_create(ruser, input, NULL, NULL, (time_t)-1);
+
+	return mailr;
+}
+
+struct mail_raw *mail_raw_open_data
+(struct mail_user *ruser, string_t *mail_data)
+{
+	struct mail_raw *mailr;
+	struct istream *input;
+
+	input = i_stream_create_from_data(str_data(mail_data), str_len(mail_data));
+
+	mailr = mail_raw_open_stream(ruser, input);
+
+	i_stream_unref(&input);
+	return mailr;
+}
+
+struct mail_raw *mail_raw_open_file
+(struct mail_user *ruser, const char *path)
+{
+	struct mail_raw *mailr;
+	struct istream *input = NULL;
+	time_t mtime = (time_t)-1;
+	const char *sender = NULL;
+
+	if ( path == NULL || strcmp(path, "-") == 0 ) {
+		path = NULL;
+		input = mail_raw_create_stream(ruser, 0, &mtime, &sender);
+	}
+
+	mailr = mail_raw_create(ruser, input, path, sender, mtime);
+	i_stream_unref(&input);
+
+	return mailr;
+}
+
+void mail_raw_close(struct mail_raw **mailr)
+{
+	mail_free(&(*mailr)->mail);
+	mailbox_transaction_rollback(&(*mailr)->trans);
+	mailbox_free(&(*mailr)->box);
+
+	i_free(*mailr);
+	*mailr = NULL;
+}
+
diff --git a/pigeonhole/src/lib-sieve/util/mail-raw.h b/pigeonhole/src/lib-sieve/util/mail-raw.h
new file mode 100644
index 0000000..a942d06
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/util/mail-raw.h
@@ -0,0 +1,27 @@
+#ifndef MAIL_RAW_H
+#define MAIL_RAW_H
+
+#include "lib.h"
+#include "master-service.h"
+
+struct mail_raw {
+	pool_t pool;
+	struct mail *mail;
+
+	struct mailbox *box;
+	struct mailbox_transaction_context *trans;
+};
+
+struct mail_user *mail_raw_user_create
+	(struct master_service *service, struct mail_user *mail_user);
+
+struct mail_raw *mail_raw_open_stream
+	(struct mail_user *ruser, struct istream *input);
+struct mail_raw *mail_raw_open_file
+	(struct mail_user *ruser, const char *path);
+struct mail_raw *mail_raw_open_data
+	(struct mail_user *ruser, string_t *mail_data);
+void mail_raw_close(struct mail_raw **mailr);
+
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/util/rfc2822.c b/pigeonhole/src/lib-sieve/util/rfc2822.c
new file mode 100644
index 0000000..ff3a9ad
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/util/rfc2822.c
@@ -0,0 +1,277 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* NOTE: much of the functionality implemented here should eventually appear
+ * somewhere in Dovecot itself.
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "unichar.h"
+
+#include "rfc2822.h"
+
+#include "message-header-encode.h"
+
+#include <stdio.h>
+#include <ctype.h>
+
+bool rfc2822_header_field_name_verify
+(const char *field_name, unsigned int len)
+{
+	const char *p = field_name;
+	const char *pend = p + len;
+
+	/* field-name   =   1*ftext
+	 * ftext        =   %d33-57 /               ; Any character except
+	 *                  %d59-126                ;  controls, SP, and
+	 *                                          ;  ":".
+	 */
+
+	while ( p < pend ) {
+		if ( *p < 33 || *p == ':' )
+			return FALSE;
+
+		p++;
+	}
+
+	return TRUE;
+}
+
+bool rfc2822_header_field_body_verify
+(const char *field_body, unsigned int len, bool allow_crlf, bool allow_utf8)
+{
+	const unsigned char *p = (const unsigned char *)field_body;
+	const unsigned char *pend = p + len;
+	bool is8bit = FALSE;
+
+	/* RFC5322:
+	 *
+	 * unstructured    =  (*([FWS] VCHAR) *WSP)
+	 * VCHAR           =  %x21-7E
+	 * FWS             =  ([*WSP CRLF] 1*WSP) /   ; Folding white space
+	 * WSP             =  SP / HTAB               ; White space
+	 */
+
+	while ( p < pend ) {
+		if ( *p < 0x20 ) {
+			if ( (*p == '\r' || *p == '\n') ) {
+				if ( !allow_crlf )
+					return FALSE;
+			} else if ( *p != '\t' ) {
+				return FALSE;
+			}
+		}
+
+		if ( !is8bit && *p > 127 ) {
+			if ( !allow_utf8 )
+				return FALSE;
+
+			is8bit = TRUE;
+		}
+
+		p++;
+	}
+
+	if ( is8bit && !uni_utf8_str_is_valid(field_body) ) {
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+/*
+ *
+ */
+
+const char *rfc2822_header_field_name_sanitize(const char *name)
+{
+	char *result = t_strdup_noconst(name);
+	char *p;
+
+	/* Make the whole name lower case ... */
+	result = str_lcase(result);
+
+	/* ... except for the first letter and those that follow '-' */
+	p = result;
+	*p = i_toupper(*p);
+	while ( *p != '\0' ) {
+		if ( *p == '-' ) {
+			p++;
+
+			if ( *p != '\0' )
+				*p = i_toupper(*p);
+
+			continue;
+		}
+
+		p++;
+	}
+
+	return result;
+}
+
+/*
+ * Message construction
+ */
+
+/* FIXME: This should be collected into a Dovecot API for composing internet
+ * mail messages.
+ */
+
+unsigned int rfc2822_header_append
+(string_t *header, const char *name, const char *body, bool crlf,
+	uoff_t *body_offset_r)
+{
+	static const unsigned int max_line = 80;
+
+	const char *bp = body;  /* Pointer */
+	const char *sp = body;  /* Start pointer */
+	const char *wp = NULL;  /* Whitespace pointer */
+	const char *nlp = NULL; /* New-line pointer */
+	unsigned int line_len = strlen(name);
+	unsigned int lines = 0;
+
+	/* Write header field name first */
+	str_append(header, name);
+	str_append(header, ": ");
+
+	if ( body_offset_r != NULL )
+		*body_offset_r = str_len(header);
+
+	line_len +=  2;
+
+	/* Add field body; fold it if necessary and account for existing folding */
+	while ( *bp != '\0' ) {
+		bool ws_first = TRUE;
+
+		while ( *bp != '\0' && nlp == NULL &&
+			(wp == NULL || line_len < max_line) ) {
+			if ( *bp == ' ' || *bp == '\t' ) {
+				if (ws_first)
+					wp = bp;
+				ws_first = FALSE;
+			} else if ( *bp == '\r' || *bp == '\n' ) {
+				if (ws_first)
+					nlp = bp;
+				else
+					nlp = wp;
+				break;
+			} else {
+				ws_first = TRUE;
+			}
+
+			bp++; line_len++;
+		}
+
+		if ( *bp == '\0' ) break;
+
+		/* Existing newline ? */
+		if ( nlp != NULL ) {			
+			/* Replace any consecutive newline and whitespace for
+			   consistency */
+			while ( *bp == ' ' || *bp == '\t' || *bp == '\r' || *bp == '\n' )
+				bp++;
+
+			str_append_data(header, sp, nlp-sp);
+
+			if ( crlf )
+				str_append(header, "\r\n");
+			else
+				str_append(header, "\n");
+
+			while ( *bp == ' ' || *bp == '\t' )
+				bp++;
+			if ( *bp != '\0' ) {
+				/* Continued line; replace leading whitespace with single TAB */
+				str_append_c(header, '\t');
+			}
+
+			sp = bp;
+		} else {
+			/* Insert newline at last whitespace within the max_line limit */
+			i_assert(wp >= sp);
+			str_append_data(header, sp, wp-sp);
+
+			/* Force continued line; drop any existing whitespace */
+			while ( *wp == ' ' || *wp == '\t' )
+				wp++;
+
+			if ( crlf )
+				str_append(header, "\r\n");
+			else
+				str_append(header, "\n");
+
+			/* Insert single TAB instead of the original whitespace */
+			str_append_c(header, '\t');
+
+			sp = wp;
+			if (sp > bp)
+				bp = sp;
+		}
+
+		lines++;
+
+		line_len = bp - sp;
+		wp = NULL;
+		nlp = NULL;
+	}
+
+	if ( bp != sp || lines == 0 ) {
+		str_append_data(header, sp, bp-sp);
+		if ( crlf )
+			str_append(header, "\r\n");
+		else
+			str_append(header, "\n");
+		lines++;
+	}
+
+	return lines;
+}
+
+void rfc2822_header_printf
+(string_t *header, const char *name, const char *fmt, ...)
+{
+	const char *body;
+	va_list args;
+
+	va_start(args, fmt);
+	body = t_strdup_vprintf(fmt, args);
+	va_end(args);
+
+	rfc2822_header_write(header, name, body);
+}
+
+void rfc2822_header_utf8_printf
+(string_t *header, const char *name, const char *fmt, ...)
+{
+	string_t *body = t_str_new(256);
+	va_list args;
+
+	va_start(args, fmt);
+	message_header_encode(t_strdup_vprintf(fmt, args), body);
+	va_end(args);
+
+	rfc2822_header_write(header, name, str_c(body));
+}
+
+
+void rfc2822_header_write_address(string_t *header,
+	const char *name, const char *address)
+{
+	bool has_8bit = FALSE;
+	const char *p;
+
+	for (p = address; *p != '\0'; p++) {
+		if ((*p & 0x80) != 0)
+			has_8bit = TRUE;
+	}
+
+	if (!has_8bit) {
+		rfc2822_header_write(header, name, address);
+	} else {
+		string_t *body = t_str_new(256);
+		message_header_encode(address, body);
+		rfc2822_header_write(header, name, str_c(body));
+	}
+}
diff --git a/pigeonhole/src/lib-sieve/util/rfc2822.h b/pigeonhole/src/lib-sieve/util/rfc2822.h
new file mode 100644
index 0000000..02266a9
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/util/rfc2822.h
@@ -0,0 +1,46 @@
+#ifndef RFC2822_H
+#define RFC2822_H
+
+#include "lib.h"
+
+#include <stdio.h>
+
+/*
+ * Verification
+ */
+
+bool rfc2822_header_field_name_verify
+	(const char *field_name, unsigned int len);
+bool rfc2822_header_field_body_verify
+	(const char *field_body, unsigned int len, bool allow_crlf, bool allow_utf8);
+
+/*
+ *
+ */
+
+const char *rfc2822_header_field_name_sanitize(const char *name);
+
+/*
+ * Message composition
+ */
+
+unsigned int rfc2822_header_append
+	(string_t *header, const char *name, const char *body, bool crlf,
+		uoff_t *body_offset_r);
+
+static inline void rfc2822_header_write
+(string_t *header, const char *name, const char *body)
+{
+	(void)rfc2822_header_append(header, name, body, TRUE, NULL);
+}
+
+void rfc2822_header_printf
+	(string_t *header, const char *name, const char *fmt, ...) ATTR_FORMAT(3, 4);
+void rfc2822_header_utf8_printf
+	(string_t *header, const char *name, const char *fmt, ...) ATTR_FORMAT(3, 4);
+
+void rfc2822_header_write_address(string_t *header,
+	const char *name, const char *address);
+
+
+#endif
diff --git a/pigeonhole/src/lib-sieve/util/test-edit-mail.c b/pigeonhole/src/lib-sieve/util/test-edit-mail.c
new file mode 100644
index 0000000..0e263a2
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/util/test-edit-mail.c
@@ -0,0 +1,842 @@
+/* Copyright (c) 2018 Pigeonhole authors, see the included COPYING file */
+
+#include "lib.h"
+#include "test-common.h"
+#include "path-util.h"
+#include "buffer.h"
+#include "str.h"
+#include "istream.h"
+#include "istream-concat.h"
+#include "istream-crlf.h"
+#include "unlink-directory.h"
+#include "master-service.h"
+#include "istream-header-filter.h"
+#include "mail-storage.h"
+#include "mail-storage-service.h"
+#include "mail-user.h"
+
+#include "mail-raw.h"
+#include "edit-mail.h"
+
+#include <time.h>
+
+static pool_t test_pool;
+
+static struct mail_storage_service_ctx *mail_storage_service = NULL;
+static struct mail_user *test_mail_user = NULL;
+static struct mail_storage_service_user *test_service_user = NULL;
+static const char *mail_home;
+static char *test_dir;
+
+static struct mail_user *test_raw_mail_user = NULL;
+
+static void str_append_no_cr(string_t *str, const char *cstr)
+{
+	const char *p, *poff;
+
+	poff = p = cstr;
+	while (*p != '\0') {
+		if (*p == '\r') {
+			str_append_data(str, poff, (p - poff));
+			poff = p+1;
+		}
+		p++;
+	}
+	str_append_data(str, poff, (p - poff));
+}
+
+static int test_init_mail_user(void)
+{
+	const char *error;
+
+	mail_home = p_strdup_printf(test_pool, "%s/test_user.%ld.%ld",
+				    test_dir, (long)time(NULL), (long)getpid());
+
+	struct mail_storage_service_input input = {
+		.userdb_fields = (const char*const[]){
+			t_strdup_printf("mail=maildir:~/"),
+			t_strdup_printf("home=%s", mail_home),
+			NULL
+		},
+		.username = "test@example.com",
+		.no_userdb_lookup = TRUE,
+		.debug = TRUE,
+	};
+
+	mail_storage_service = mail_storage_service_init(
+		master_service, NULL,
+		(MAIL_STORAGE_SERVICE_FLAG_NO_RESTRICT_ACCESS |
+		 MAIL_STORAGE_SERVICE_FLAG_NO_LOG_INIT |
+		 MAIL_STORAGE_SERVICE_FLAG_NO_PLUGINS));
+
+	if (mail_storage_service_lookup(mail_storage_service, &input,
+					&test_service_user, &error) < 0)
+	{
+		i_error("Cannot lookup test user: %s", error);
+		return -1;
+	}
+
+	if (mail_storage_service_next(mail_storage_service, test_service_user,
+				      &test_mail_user, &error) < 0)
+	{
+		 i_error("Cannot lookup test user: %s", error);
+		 return -1;
+	}
+
+	return 0;
+}
+
+static void test_deinit_mail_user()
+{
+	const char *error;
+	mail_user_unref(&test_mail_user);
+	mail_storage_service_user_unref(&test_service_user);
+	mail_storage_service_deinit(&mail_storage_service);
+	if (unlink_directory(mail_home, UNLINK_DIRECTORY_FLAG_RMDIR,
+			     &error) < 0)
+		i_error("unlink_directory(%s) failed: %s", mail_home, error);
+}
+
+static void test_init(void)
+{
+	test_pool = pool_alloconly_create(MEMPOOL_GROWING"test pool", 128);
+
+	test_init_mail_user();
+	test_raw_mail_user =
+		mail_raw_user_create(master_service, test_mail_user);
+}
+
+static void test_deinit(void)
+{
+	mail_user_unref(&test_raw_mail_user);
+	test_deinit_mail_user();
+	pool_unref(&test_pool);
+}
+
+static void test_stream_data(struct istream *input, buffer_t *buffer)
+{
+	const unsigned char *data;
+	size_t size;
+
+	while (i_stream_read_more(input, &data, &size) > 0) {
+		buffer_append(buffer, data, size);
+		i_stream_skip(input, size);
+	}
+
+	test_assert(!i_stream_have_bytes_left(input));
+	test_assert(input->stream_errno == 0);
+}
+
+static void test_stream_data_slow(struct istream *input, buffer_t *buffer)
+{
+	const unsigned char *data;
+	size_t size;
+	int ret;
+
+	ret = i_stream_read(input);
+	while (ret > 0 || i_stream_have_bytes_left(input) || ret == -2) {
+		data = i_stream_get_data(input, &size);
+		buffer_append(buffer, data, 1);
+		i_stream_skip(input, 1);
+
+		ret = i_stream_read(input);
+	}
+
+	test_assert(!i_stream_have_bytes_left(input));
+	test_assert(input->stream_errno == 0);
+}
+
+static void test_edit_mail_concatenated(void)
+{
+	static const char *hide_headers[] =
+		{ "Return-Path", "X-Sieve", "X-Sieve-Redirected-From" };
+	static const char *msg_part1 =
+		"Received: from example.com ([127.0.0.1] helo=example.com)\r\n"
+		"	by example.org with LMTP (Dovecot)\r\n"
+		"	(envelope-from <frop-bounces@example.com>)\r\n"
+		"	id 1er3e8-0015df-QO\r\n"
+		"	for timo@example.org;\r\n"
+		"	Sat, 03 Mar 2018 10:40:05 +0100\r\n";
+	static const char *msg_part2 =
+		"Return-Path: <stephan@example.com>\r\n";
+	static const char *msg_part3 =
+		"Delivered-To: <timo@example.org>\r\n";
+	static const char *msg_part4 =
+		"From: <stephan@example.com>\r\n"
+		"To: <timo@example.org>\r\n"
+		"Subject: Sieve editheader breaks with LMTP\r\n"
+		"\r\n"
+		"Hi,\r\n"
+		"\r\n"
+		"Sieve editheader seems to be broken when used from LMTP\r\n"
+		"\r\n"
+		"Regards,\r\n"
+		"\r\n"
+		"Stephan.\r\n";
+	static const char *msg_added =
+		"X-Filter-Junk-Type: NONE\r\n"
+		"X-Filter-Junk-Flag: NO\r\n";
+	struct istream *inputs[5], *input_msg, *input_filt, *input_mail, *input;
+	buffer_t *buffer;
+	struct mail_raw *rawmail;
+	struct edit_mail *edmail;
+	struct mail *mail;
+	string_t *expected;
+	const char *value;
+
+	test_begin("edit-mail - concatenated");
+	test_init();
+
+	/* Compose the message */
+
+	inputs[0] = i_stream_create_from_data(msg_part1, strlen(msg_part1));
+	inputs[1] = i_stream_create_from_data(msg_part2, strlen(msg_part2));
+	inputs[2] = i_stream_create_from_data(msg_part3, strlen(msg_part3));
+	inputs[3] = i_stream_create_from_data(msg_part4, strlen(msg_part4));
+	inputs[4] = NULL;
+
+	input_msg = i_stream_create_concat(inputs);
+
+	i_stream_unref(&inputs[0]);
+	i_stream_unref(&inputs[1]);
+	i_stream_unref(&inputs[2]);
+	i_stream_unref(&inputs[3]);
+
+	rawmail = mail_raw_open_stream(test_raw_mail_user, input_msg);
+
+	/* Add headers */
+
+	edmail = edit_mail_wrap(rawmail->mail);
+
+	edit_mail_header_add(edmail, "X-Filter-Junk-Flag", "NO", FALSE);
+	edit_mail_header_add(edmail, "X-Filter-Junk-Type", "NONE", FALSE);
+
+	mail = edit_mail_get_mail(edmail);
+
+	/* Evaluate modified header */
+
+	test_assert(mail_get_first_header_utf8(mail, "Subject", &value) > 0);
+	test_assert(strcmp(value, "Sieve editheader breaks with LMTP") == 0);
+
+	test_assert(mail_get_first_header_utf8(mail, "X-Filter-Junk-Flag",
+					       &value) > 0);
+	test_assert(strcmp(value, "NO") == 0);
+	test_assert(mail_get_first_header_utf8(mail, "X-Filter-Junk-Type",
+					       &value) > 0);
+	test_assert(strcmp(value, "NONE") == 0);
+
+	test_assert(mail_get_first_header_utf8(mail, "Delivered-To",
+					       &value) > 0);
+
+	/* Prepare tests */
+
+	if (mail_get_stream(mail, NULL, NULL, &input_mail) < 0) {
+		i_fatal("Failed to open mail stream: %s",
+			mailbox_get_last_internal_error(mail->box, NULL));
+	}
+
+	buffer = buffer_create_dynamic(default_pool, 1024);
+	expected = t_str_new(1024);
+
+	/* Added */
+
+	i_stream_seek(input_mail, 0);
+	buffer_set_used_size(buffer, 0);
+	input = input_mail;
+
+	test_stream_data(input_mail, buffer);
+
+	str_truncate(expected, 0);
+	str_append(expected, msg_added);
+	str_append(expected, msg_part1);
+	str_append(expected, msg_part2);
+	str_append(expected, msg_part3);
+	str_append(expected, msg_part4);
+
+	test_out("added", strcmp(str_c(buffer), str_c(expected)) == 0);
+
+	/* Added, slow */
+
+	i_stream_seek(input_mail, 0);
+	buffer_set_used_size(buffer, 0);
+
+	test_stream_data_slow(input_mail, buffer);
+
+	str_truncate(expected, 0);
+	str_append(expected, msg_added);
+	str_append(expected, msg_part1);
+	str_append(expected, msg_part2);
+	str_append(expected, msg_part3);
+	str_append(expected, msg_part4);
+
+	test_out("added, slow", strcmp(str_c(buffer), str_c(expected)) == 0);
+
+	/* Added, filtered */
+
+	i_stream_seek(input_mail, 0);
+	buffer_set_used_size(buffer, 0);
+
+	input_filt = i_stream_create_header_filter(
+		input_mail, (HEADER_FILTER_EXCLUDE | HEADER_FILTER_NO_CR),
+		hide_headers, N_ELEMENTS(hide_headers),
+		*null_header_filter_callback, (void *)NULL);
+	input = i_stream_create_lf(input_filt);
+	i_stream_unref(&input_filt);
+
+	test_stream_data(input, buffer);
+	test_assert(!i_stream_have_bytes_left(input_mail));
+	test_assert(input_mail->stream_errno == 0);
+
+	str_truncate(expected, 0);
+	str_append_no_cr(expected, msg_added);
+	str_append_no_cr(expected, msg_part1);
+	str_append_no_cr(expected, msg_part3);
+	str_append_no_cr(expected, msg_part4);
+
+	test_out("added, filtered",
+		 strcmp(str_c(buffer), str_c(expected)) == 0);
+
+	i_stream_unref(&input);
+
+	/* Added, filtered, slow */
+
+	i_stream_seek(input_mail, 0);
+	buffer_set_used_size(buffer, 0);
+
+	input_filt = i_stream_create_header_filter(
+		input_mail, (HEADER_FILTER_EXCLUDE | HEADER_FILTER_NO_CR),
+		hide_headers, N_ELEMENTS(hide_headers),
+		*null_header_filter_callback, (void *)NULL);
+	input = i_stream_create_lf(input_filt);
+	i_stream_unref(&input_filt);
+
+	test_stream_data_slow(input, buffer);
+	test_assert(!i_stream_have_bytes_left(input_mail));
+	test_assert(input_mail->stream_errno == 0);
+
+	str_truncate(expected, 0);
+	str_append_no_cr(expected, msg_added);
+	str_append_no_cr(expected, msg_part1);
+	str_append_no_cr(expected, msg_part3);
+	str_append_no_cr(expected, msg_part4);
+
+	test_out("added, filtered, slow",
+		 strcmp(str_c(buffer), str_c(expected)) == 0);
+
+	i_stream_unref(&input);
+
+	/* Delete header */
+
+	edit_mail_header_delete(edmail, "Delivered-To", 0);
+
+	/* Evaluate modified header */
+
+	test_assert(mail_get_first_header_utf8(mail, "Subject", &value) > 0);
+	test_assert(strcmp(value, "Sieve editheader breaks with LMTP") == 0);
+
+	test_assert(mail_get_first_header_utf8(mail, "X-Filter-Junk-Flag",
+					       &value) > 0);
+	test_assert(strcmp(value, "NO") == 0);
+	test_assert(mail_get_first_header_utf8(mail, "X-Filter-Junk-Type",
+					       &value) > 0);
+	test_assert(strcmp(value, "NONE") == 0);
+
+	test_assert(mail_get_first_header_utf8(mail, "Delivered-To",
+					       &value) == 0);
+
+	/* Deleted */
+
+	i_stream_seek(input_mail, 0);
+	buffer_set_used_size(buffer, 0);
+	input = input_mail;
+
+	test_stream_data(input_mail, buffer);
+
+	str_truncate(expected, 0);
+	str_append(expected, msg_added);
+	str_append(expected, msg_part1);
+	str_append(expected, msg_part2);
+	str_append(expected, msg_part4);
+
+	test_out("deleted", strcmp(str_c(buffer), str_c(expected)) == 0);
+
+	/* Deleted, slow */
+
+	i_stream_seek(input_mail, 0);
+	buffer_set_used_size(buffer, 0);
+
+	test_stream_data_slow(input_mail, buffer);
+
+	str_truncate(expected, 0);
+	str_append(expected, msg_added);
+	str_append(expected, msg_part1);
+	str_append(expected, msg_part2);
+	str_append(expected, msg_part4);
+
+	test_out("deleted, slow", strcmp(str_c(buffer), str_c(expected)) == 0);
+
+	/* Deleted, filtered */
+
+	i_stream_seek(input_mail, 0);
+	buffer_set_used_size(buffer, 0);
+
+	input_filt = i_stream_create_header_filter(
+		input_mail, (HEADER_FILTER_EXCLUDE | HEADER_FILTER_NO_CR),
+		hide_headers, N_ELEMENTS(hide_headers),
+		*null_header_filter_callback, (void *)NULL);
+	input = i_stream_create_lf(input_filt);
+	i_stream_unref(&input_filt);
+
+	test_stream_data(input, buffer);
+	test_assert(!i_stream_have_bytes_left(input_mail));
+	test_assert(input_mail->stream_errno == 0);
+
+	str_truncate(expected, 0);
+	str_append_no_cr(expected, msg_added);
+	str_append_no_cr(expected, msg_part1);
+	str_append_no_cr(expected, msg_part4);
+
+	test_out("deleted, filtered",
+		 strcmp(str_c(buffer), str_c(expected)) == 0);
+
+	i_stream_unref(&input);
+
+	/* Deleted, filtered, slow */
+
+	i_stream_seek(input_mail, 0);
+	buffer_set_used_size(buffer, 0);
+
+	input_filt = i_stream_create_header_filter(input_mail,
+		HEADER_FILTER_EXCLUDE | HEADER_FILTER_NO_CR, hide_headers,
+		N_ELEMENTS(hide_headers), *null_header_filter_callback,
+		(void *)NULL);
+	input = i_stream_create_lf(input_filt);
+	i_stream_unref(&input_filt);
+
+	test_stream_data_slow(input, buffer);
+	test_assert(!i_stream_have_bytes_left(input_mail));
+	test_assert(input_mail->stream_errno == 0);
+
+	str_truncate(expected, 0);
+	str_append_no_cr(expected, msg_added);
+	str_append_no_cr(expected, msg_part1);
+	str_append_no_cr(expected, msg_part4);
+
+	test_out("deleted, filtered, slow",
+		 strcmp(str_c(buffer), str_c(expected)) == 0);
+
+	i_stream_unref(&input);
+
+	/* clean up */
+
+	buffer_free(&buffer);
+	edit_mail_unwrap(&edmail);
+	mail_raw_close(&rawmail);
+	i_stream_unref(&input_msg);
+	test_deinit();
+	test_end();
+}
+
+static const char *big_header =
+	"X-A: AAAA\n"
+	"X-Big-One: AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	" AAAAAAAAAAAAAAAAAAAAAAAAA\n"
+	"X-B: BBBB\n"
+	"\n"
+	"Frop!\n";
+
+static void test_edit_mail_big_header(void)
+{
+	struct istream *input_msg, *input_mail;
+	buffer_t *buffer;
+	struct mail_raw *rawmail;
+	struct edit_mail *edmail;
+	struct mail *mail;
+	const char *value;
+
+	test_begin("edit-mail - big header");
+	test_init();
+
+	/* compose the message */
+
+	input_msg = i_stream_create_from_data(big_header, strlen(big_header));
+
+	rawmail = mail_raw_open_stream(test_raw_mail_user, input_msg);
+
+	edmail = edit_mail_wrap(rawmail->mail);
+
+	/* delete header */
+
+	edit_mail_header_delete(edmail, "X-B", 0);
+	mail = edit_mail_get_mail(edmail);
+
+	/* prepare tests */
+
+	if (mail_get_stream(mail, NULL, NULL, &input_mail) < 0) {
+		i_fatal("Failed to open mail stream: %s",
+			mailbox_get_last_internal_error(mail->box, NULL));
+	}
+
+	buffer = buffer_create_dynamic(default_pool, 1024);
+
+	/* evaluate modified header */
+
+	test_assert(mail_get_first_header_utf8(mail, "X-B", &value) == 0);
+
+	/* deleted */
+
+	i_stream_seek(input_mail, 0);
+	buffer_set_used_size(buffer, 0);
+
+	test_stream_data(input_mail, buffer);
+
+	/* clean up */
+
+	buffer_free(&buffer);
+	edit_mail_unwrap(&edmail);
+	mail_raw_close(&rawmail);
+	i_stream_unref(&input_msg);
+	test_deinit();
+	test_end();
+}
+
+static void test_edit_mail_small_buffer(void)
+{
+	static const char *message =
+		"X-A: AAAA\n"
+		"X-B: BBBB\n"
+		"\n"
+		"Frop!\n";
+	struct istream *input_msg, *input_mail;
+	buffer_t *buffer;
+	struct mail_raw *rawmail;
+	struct edit_mail *edmail;
+	struct mail *mail;
+	const char *value;
+	unsigned int i;
+
+	test_begin("edit-mail - small buffer");
+	test_init();
+
+	/* compose the message */
+
+	input_msg = i_stream_create_from_data(message, strlen(message));
+	i_stream_set_max_buffer_size(input_msg, 16);
+
+	rawmail = mail_raw_open_stream(test_raw_mail_user, input_msg);
+
+	edmail = edit_mail_wrap(rawmail->mail);
+
+	/* add headers */
+
+	for (i = 0; i < 16; i++) {
+		edit_mail_header_add(edmail, "X-F", "FF", FALSE);
+		edit_mail_header_add(edmail, "X-L", "LL", TRUE);
+	}
+	
+	mail = edit_mail_get_mail(edmail);
+
+	/* prepare tests */
+
+	if (mail_get_stream(mail, NULL, NULL, &input_mail) < 0) {
+		i_fatal("Failed to open mail stream: %s",
+			mailbox_get_last_internal_error(mail->box, NULL));
+	}
+
+	buffer = buffer_create_dynamic(default_pool, 1024);
+
+	/* evaluate modified header */
+
+	test_assert(mail_get_first_header_utf8(mail, "X-F", &value) > 0);
+	test_assert(mail_get_first_header_utf8(mail, "X-A", &value) > 0);
+	test_assert(mail_get_first_header_utf8(mail, "X-B", &value) > 0);
+	test_assert(mail_get_first_header_utf8(mail, "X-L", &value) > 0);
+
+	/* check stream read */
+
+	i_stream_seek(input_mail, 0);
+	buffer_set_used_size(buffer, 0);
+
+	test_stream_data(input_mail, buffer);
+
+	/* clean up */
+
+	buffer_free(&buffer);
+	edit_mail_unwrap(&edmail);
+	mail_raw_close(&rawmail);
+	i_stream_unref(&input_msg);
+	test_deinit();
+	test_end();
+}
+
+int main(int argc, char *argv[])
+{
+	static void (*test_functions[])(void) = {
+		test_edit_mail_concatenated,
+		test_edit_mail_big_header,
+		test_edit_mail_small_buffer,
+		NULL
+	};
+	const enum master_service_flags service_flags =
+		MASTER_SERVICE_FLAG_STANDALONE |
+		MASTER_SERVICE_FLAG_DONT_SEND_STATS |
+		MASTER_SERVICE_FLAG_NO_CONFIG_SETTINGS;
+	const char *cwd, *error;
+	int ret;
+
+	master_service = master_service_init("test-edit-header", service_flags,
+					     &argc, &argv, "");
+	master_service_init_finish(master_service);
+
+	if (t_get_working_dir(&cwd, &error) < 0)
+		i_fatal("getcwd() failed: %s", error);
+	test_dir = i_strdup(cwd);
+
+	ret = test_run(test_functions);
+
+	i_free(test_dir);
+	master_service_deinit(&master_service);
+
+	return ret;
+}
+
diff --git a/pigeonhole/src/lib-sieve/util/test-rfc2822.c b/pigeonhole/src/lib-sieve/util/test-rfc2822.c
new file mode 100644
index 0000000..66e8ee5
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/util/test-rfc2822.c
@@ -0,0 +1,197 @@
+/* Copyright (c) 2018 Pigeonhole authors, see the included COPYING file */
+
+#include "lib.h"
+#include "test-common.h"
+#include "str.h"
+
+#include "rfc2822.h"
+
+struct test_header_write {
+	const char *name;
+	const char *body;
+	const char *output;
+};
+
+static const struct test_header_write header_write_tests[] = {
+	{
+		.name = "Frop",
+		.body = "Bladiebla",
+		.output = "Frop: Bladiebla\r\n"
+	},{
+		.name = "Subject",
+		.body = "This is a very long subject that well exceeds the "
+			"boundary of 80 characters. It should therefore "
+			"trigger the header folding algorithm.",
+		.output =
+			"Subject: This is a very long subject that well "
+			"exceeds the boundary of 80\r\n"
+			"\tcharacters. It should therefore trigger the header "
+			"folding algorithm.\r\n"
+	},{
+		.name = "Subject",
+		.body = "This\tis\ta\tvery\tlong\tsubject\tthat\twell\texceeds"
+			"\tthe\tboundary\tof\t80\tcharacters.\tIt\tshould\t"
+			"therefore\ttrigger\tthe\theader\tfolding\talgorithm.",
+		.output =
+			"Subject: This\tis\ta\tvery\tlong\tsubject\tthat\twell"
+			"\texceeds\tthe\tboundary\tof\t80\r\n"
+			"\tcharacters.\tIt\tshould\ttherefore\ttrigger\tthe\t"
+			"header\tfolding\talgorithm.\r\n"
+	},{
+		.name = "Comment",
+		.body = "This header already contains newlines.\n"
+			"The header folding algorithm should respect these.\n"
+			"It also should convert between CRLF and LF when "
+			"needed.",
+		.output = "Comment: This header already contains newlines.\r\n"
+			"\tThe header folding algorithm should respect "
+			"these.\r\n"
+			"\tIt also should convert between CRLF and LF when "
+			"needed.\r\n"
+	},{
+		.name = "References",
+		.body = "<messageid1@example.com> <messageid2@example.com> "
+			"<extremelylonglonglonglonglonglonglonglonglonglong"
+			"longlongmessageid3@example.com> "
+			"<messageid4@example.com>",
+		.output = "References: <messageid1@example.com> "
+			"<messageid2@example.com>\r\n"
+			"\t<extremelylonglonglonglonglonglonglonglonglonglong"
+			"longlongmessageid3@example.com>\r\n"
+			"\t<messageid4@example.com>\r\n",
+	},{
+		.name = "Cc",
+		.body = "\"Richard Edgar Cipient\"   "
+			"<r.e.cipient@example.com>,   \"Albert Buser\"   "
+			"<a.buser@example.com>,   \"Steven Pammer\"  "
+			"<s.pammer@example.com>",
+		.output = "Cc: \"Richard Edgar Cipient\"   "
+			"<r.e.cipient@example.com>,   \"Albert Buser\"\r\n"
+			"\t<a.buser@example.com>,   \"Steven Pammer\"  "
+			"<s.pammer@example.com>\r\n"
+	},{
+		.name = "References",
+		.body = "<00fd01d31b6c$33d98e30$9b8caa90$@karel@aa.example.org"
+			"> <00f201d31c36$afbfa320$0f3ee960$@karel@aa.example.o"
+			"rg>   <015c01d32023$fe3840c0$faa8c240$@karel@aa.examp"
+			"le.org>    <014601d325a4$ece1ed90$c6a5c8b0$@karel@aa."
+			"example.org>   <012801d32b24$7734c380$659e4a80$@karel"
+			"@aa.example.org> <00da01d32be9$2d9944b0$88cbce10$@kar"
+			"el@aa.example.org>      <006a01d336ef$6825d5b0$387181"
+			"10$@karel@aa.example.org>  <018501d33880$58b654f0$0a2"
+			"2fed0$@frederik@aa.example.org> <00e601d33ba3$be50f10"
+			"0$3af2d300$@frederik@aa.example.org>  <016501d341ee$e"
+			"678e1a0$b36aa4e0$@frederik@aa.example.org>    <00ab01"
+			"d348f9$ae2e1ab0$0a8a5010$@karel@aa.example.org> <0086"
+			"01d349c1$98ff4ba0$cafde2e0$@frederik@aa.example.org> "
+			" <019301d357e6$a2190680$e64b1380$@frederik@aa.example"
+			".org>                             <025f01d384b0$24d2c"
+			"660$6e785320$@karel@aa.example.org>   <01cf01d3889e$7"
+			"280cb90$578262b0$@karel@aa.example.org>    <013701d38"
+			"bc2$9164b950$b42e2bf0$@karel@aa.example.org>         "
+			"       <014f01d3a5b1$a51afc80$ef\n"
+			"               \n"
+			"\t \t \t \t \t \t \t \t5\t0\tf\t5\t8\t0\t$\t@\tk\ta\t"
+			"r\te\tl\t@\taa.example.org>        <01cb01d3af29$dd7d"
+			"1b40$987751c0$@karel@aa.example.org>                 "
+			"                      <00b401d3f2bc$6ad8c180$408a4480"
+			"$@karel@aa.example.org>   <011a01d3f6ab$0eeb0480$2cc1"
+			"0d80$@frederik@aa.example.org> <005c01d3f774$37f1b210"
+			"$a7d51630$@richard@aa.example.org>   <01a801d3fc2d$59"
+			"0f7730$0b2e6590$@frederik@aa.example.org> <007501d3fc"
+			"f5$23d75ce0$6b8616a0$@frederik@aa.example.org> <015d0"
+			"1d3fdbf$136da510$3a48ef30$@frederik@aa.example.org> <"
+			"021a01d3fe87$556d68b0$00483a10$@frederik@aa.example.o"
+			"rg> <013f01d3ff4e$a2d13d30$e873b790$@frederik@aa.exam"
+			"ple.org> <001f01d401ab$31e7b090$95b711b0$@frederik@aa"
+			".example.org> <017201d40273$a118d200$e34a7600$@freder"
+			"ik@aa.example.org> <017401d4033e$ca3602e0$5ea208a0$@f"
+			"rederik@aa.example.org> <02a601d40404$608b9e10$21a2da"
+			"30$@frederik@aa.example.org> <014301d404d0$b65269b0$2"
+			"2f73d10$@frederik@aa.example.org> <015901d4072b$b5a1b"
+			"950$20e52bf0$@frederik@aa.example.org> <01b401d407f3$"
+			"bef52050$3cdf\n"
+			" 60 \n"
+			"\tf0 \t$@ \tfr \ted \teri\tk@aa.example.org> <012801d"
+			"408bd$6602fce0$3208f6a0$@frederik@aa.example.org> <01"
+			"c801d40984$ae4b23c0$0ae16b40$@frederik@aa.example.org"
+			"> <00ec01d40a4d$12859190$3790b4b0$@frederik@aa.exampl"
+			"e.org> <02af01d40d74$589c9050$09d5b0f0$@frederik@aa.e"
+			"xample.org> <000d01d40ec8$d3d337b0$7b79a710$@richard@"
+			"aa.example.org>\n",
+		.output = "References: <00fd01d31b6c$33d98e30$9b8caa90$@karel@aa.example.org>\r\n"
+			"\t<00f201d31c36$afbfa320$0f3ee960$@karel@aa.example.org>\r\n"
+			"\t<015c01d32023$fe3840c0$faa8c240$@karel@aa.example.org>\r\n"
+			"\t<014601d325a4$ece1ed90$c6a5c8b0$@karel@aa.example.org>\r\n"
+			"\t<012801d32b24$7734c380$659e4a80$@karel@aa.example.org>\r\n"
+			"\t<00da01d32be9$2d9944b0$88cbce10$@karel@aa.example.org>\r\n"
+			"\t<006a01d336ef$6825d5b0$38718110$@karel@aa.example.org>\r\n"
+			"\t<018501d33880$58b654f0$0a22fed0$@frederik@aa.example.org>\r\n"
+			"\t<00e601d33ba3$be50f100$3af2d300$@frederik@aa.example.org>\r\n"
+			"\t<016501d341ee$e678e1a0$b36aa4e0$@frederik@aa.example.org>\r\n"
+			"\t<00ab01d348f9$ae2e1ab0$0a8a5010$@karel@aa.example.org>\r\n"
+			"\t<008601d349c1$98ff4ba0$cafde2e0$@frederik@aa.example.org>\r\n"
+			"\t<019301d357e6$a2190680$e64b1380$@frederik@aa.example.org>\r\n"
+			"\t<025f01d384b0$24d2c660$6e785320$@karel@aa.example.org>\r\n"
+			"\t<01cf01d3889e$7280cb90$578262b0$@karel@aa.example.org>\r\n"
+			"\t<013701d38bc2$9164b950$b42e2bf0$@karel@aa.example.org>\r\n"
+			"\t<014f01d3a5b1$a51afc80$ef\r\n"
+			"\t5\t0\tf\t5\t8\t0\t$\t@\tk\ta\tr\te\tl\t@\taa.example.org>\r\n"
+			"\t<01cb01d3af29$dd7d1b40$987751c0$@karel@aa.example.org>\r\n"
+			"\t<00b401d3f2bc$6ad8c180$408a4480$@karel@aa.example.org>\r\n"
+			"\t<011a01d3f6ab$0eeb0480$2cc10d80$@frederik@aa.example.org>\r\n"
+			"\t<005c01d3f774$37f1b210$a7d51630$@richard@aa.example.org>\r\n"
+			"\t<01a801d3fc2d$590f7730$0b2e6590$@frederik@aa.example.org>\r\n"
+			"\t<007501d3fcf5$23d75ce0$6b8616a0$@frederik@aa.example.org>\r\n"
+			"\t<015d01d3fdbf$136da510$3a48ef30$@frederik@aa.example.org>\r\n"
+			"\t<021a01d3fe87$556d68b0$00483a10$@frederik@aa.example.org>\r\n"
+			"\t<013f01d3ff4e$a2d13d30$e873b790$@frederik@aa.example.org>\r\n"
+			"\t<001f01d401ab$31e7b090$95b711b0$@frederik@aa.example.org>\r\n"
+			"\t<017201d40273$a118d200$e34a7600$@frederik@aa.example.org>\r\n"
+			"\t<017401d4033e$ca3602e0$5ea208a0$@frederik@aa.example.org>\r\n"
+			"\t<02a601d40404$608b9e10$21a2da30$@frederik@aa.example.org>\r\n"
+			"\t<014301d404d0$b65269b0$22f73d10$@frederik@aa.example.org>\r\n"
+			"\t<015901d4072b$b5a1b950$20e52bf0$@frederik@aa.example.org>\r\n"
+			"\t<01b401d407f3$bef52050$3cdf\r\n"
+			"\t60\r\n"
+			"\tf0 \t$@ \tfr \ted \teri\tk@aa.example.org>\r\n"
+			"\t<012801d408bd$6602fce0$3208f6a0$@frederik@aa.example.org>\r\n"
+			"\t<01c801d40984$ae4b23c0$0ae16b40$@frederik@aa.example.org>\r\n"
+			"\t<00ec01d40a4d$12859190$3790b4b0$@frederik@aa.example.org>\r\n"
+			"\t<02af01d40d74$589c9050$09d5b0f0$@frederik@aa.example.org>\r\n"
+			"\t<000d01d40ec8$d3d337b0$7b79a710$@richard@aa.example.org>\r\n"
+	}
+};
+
+static const unsigned int header_write_tests_count =
+	N_ELEMENTS(header_write_tests);
+
+static void test_rfc2822_header_write(void)
+{
+	string_t *header;
+	unsigned int i;
+
+	test_begin("rfc2822 - header write");
+
+	header = t_str_new(1024);
+	for (i = 0; i < header_write_tests_count; i++) {
+		const struct test_header_write *test = &header_write_tests[i];
+
+		str_truncate(header, 0);
+		rfc2822_header_write(header, test->name, test->body);
+
+		test_assert_idx(strcmp(str_c(header), test->output) == 0, i);
+	}
+
+	test_end();
+}
+
+int main(void)
+{
+	static void (*test_functions[])(void) = {
+		test_rfc2822_header_write,
+		NULL
+	};
+	return test_run(test_functions);
+}
+
diff --git a/pigeonhole/src/managesieve-login/Makefile.am b/pigeonhole/src/managesieve-login/Makefile.am
new file mode 100644
index 0000000..3bfbc75
--- /dev/null
+++ b/pigeonhole/src/managesieve-login/Makefile.am
@@ -0,0 +1,43 @@
+settingsdir = $(dovecot_moduledir)/settings
+
+dovecot_pkglibexec_PROGRAMS = managesieve-login
+
+AM_CPPFLAGS = \
+	$(LIBDOVECOT_INCLUDE) \
+	$(LIBDOVECOT_SERVICE_INCLUDE) \
+	$(LIBDOVECOT_LOGIN_INCLUDE) \
+	-I$(top_srcdir) \
+	-I$(top_srcdir)/src/lib-managesieve
+
+libmanagesieve_login_settings_la_LDFLAGS = -module -avoid-version
+
+settings_LTLIBRARIES = \
+	libmanagesieve_login_settings.la
+
+libmanagesieve_login_settings_la_SOURCES = \
+	managesieve-login-settings.c \
+	managesieve-login-settings-plugin.c
+
+libmanagesieve_login_settings_la_CFLAGS = \
+	$(AM_CFLAGS) $(LIBDOVECOT_CONFIG_INCLUDE) -DPKG_LIBEXECDIR=\""$(dovecot_pkglibexecdir)"\"
+
+libs = \
+	$(top_builddir)/src/lib-managesieve/libmanagesieve.la
+
+managesieve_login_CPPFLAGS = $(AM_CPPFLAGS) $(BINARY_CFLAGS)
+managesieve_login_LDFLAGS = $(BINARY_LDFLAGS)
+managesieve_login_LDADD = $(libs) $(LIBDOVECOT_LOGIN) $(LIBDOVECOT)
+managesieve_login_DEPENDENCIES = $(libs) $(LIBDOVECOT_LOGIN_DEPS) $(LIBDOVECOT_DEPS)
+
+managesieve_login_SOURCES = \
+	client.c \
+	client-authenticate.c \
+	managesieve-login-settings.c \
+	managesieve-proxy.c
+
+noinst_HEADERS = \
+	client.h \
+	client-authenticate.h \
+	managesieve-login-settings.h \
+	managesieve-login-settings-plugin.h \
+	managesieve-proxy.h
diff --git a/pigeonhole/src/managesieve-login/Makefile.in b/pigeonhole/src/managesieve-login/Makefile.in
new file mode 100644
index 0000000..14d7b78
--- /dev/null
+++ b/pigeonhole/src/managesieve-login/Makefile.in
@@ -0,0 +1,931 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
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+    true; \
+  else \
+    false; \
+  fi; \
+}
+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
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+  if $(am__is_gnu_make); then \
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+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+  }; \
+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
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+      *=*|--*) continue;; \
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+    esac; \
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+am__aclocal_m4_deps = $(top_srcdir)/m4/dovecot.m4 \
+	$(top_srcdir)/m4/libtool.m4 $(top_srcdir)/m4/ltoptions.m4 \
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+	$(top_srcdir)/m4/lt~obsolete.m4 $(top_srcdir)/configure.ac
+am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
+	$(ACLOCAL_M4)
+DIST_COMMON = $(srcdir)/Makefile.am $(noinst_HEADERS) \
+	$(am__DIST_COMMON)
+mkinstalldirs = $(install_sh) -d
+CONFIG_HEADER = $(top_builddir)/dummy-config.h \
+	$(top_builddir)/pigeonhole-config.h
+CONFIG_CLEAN_FILES =
+CONFIG_CLEAN_VPATH_FILES =
+am__installdirs = "$(DESTDIR)$(dovecot_pkglibexecdir)" \
+	"$(DESTDIR)$(settingsdir)"
+PROGRAMS = $(dovecot_pkglibexec_PROGRAMS)
+am__vpath_adj_setup = srcdirstrip=`echo "$(srcdir)" | sed 's|.|.|g'`;
+am__vpath_adj = case $$p in \
+    $(srcdir)/*) f=`echo "$$p" | sed "s|^$$srcdirstrip/||"`;; \
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+  for p in $$list; do echo "$$p"; done | sed -e "s|$$srcdirstrip/||"
+am__nobase_list = $(am__nobase_strip_setup); \
+  for p in $$list; do echo "$$p $$p"; done | \
+  sed "s| $$srcdirstrip/| |;"' / .*\//!s/ .*/ ./; s,\( .*\)/[^/]*$$,\1,' | \
+  $(AWK) 'BEGIN { files["."] = "" } { files[$$2] = files[$$2] " " $$1; \
+    if (++n[$$2] == $(am__install_max)) \
+      { print $$2, files[$$2]; n[$$2] = 0; files[$$2] = "" } } \
+    END { for (dir in files) print dir, files[dir] }'
+am__base_list = \
+  sed '$$!N;$$!N;$$!N;$$!N;$$!N;$$!N;$$!N;s/\n/ /g' | \
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+am__uninstall_files_from_dir = { \
+  test -z "$$files" \
+    || { test ! -d "$$dir" && test ! -f "$$dir" && test ! -r "$$dir"; } \
+    || { echo " ( cd '$$dir' && rm -f" $$files ")"; \
+         $(am__cd) "$$dir" && rm -f $$files; }; \
+  }
+LTLIBRARIES = $(settings_LTLIBRARIES)
+libmanagesieve_login_settings_la_LIBADD =
+am_libmanagesieve_login_settings_la_OBJECTS = libmanagesieve_login_settings_la-managesieve-login-settings.lo \
+	libmanagesieve_login_settings_la-managesieve-login-settings-plugin.lo
+libmanagesieve_login_settings_la_OBJECTS =  \
+	$(am_libmanagesieve_login_settings_la_OBJECTS)
+AM_V_lt = $(am__v_lt_@AM_V@)
+am__v_lt_ = $(am__v_lt_@AM_DEFAULT_V@)
+am__v_lt_0 = --silent
+am__v_lt_1 = 
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+	$(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=link $(CCLD) \
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+	managesieve_login-managesieve-proxy.$(OBJEXT)
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+	./$(DEPDIR)/managesieve_login-client-authenticate.Po \
+	./$(DEPDIR)/managesieve_login-client.Po \
+	./$(DEPDIR)/managesieve_login-managesieve-login-settings.Po \
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+	$(LIBDOVECOT_SERVICE_INCLUDE) \
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+	-I$(top_srcdir)/src/lib-managesieve
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+	managesieve-login-settings-plugin.c
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+	client.c \
+	client-authenticate.c \
+	managesieve-login-settings.c \
+	managesieve-proxy.c
+
+noinst_HEADERS = \
+	client.h \
+	client-authenticate.h \
+	managesieve-login-settings.h \
+	managesieve-login-settings-plugin.h \
+	managesieve-proxy.h
+
+all: all-am
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+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
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+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/managesieve-login/Makefile
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+	  *config.status*) \
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+	    } \
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+	cd "$(DESTDIR)$(dovecot_pkglibexecdir)" && rm -f $$files
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+	test -n "$(EXEEXT)" || exit 0; \
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+	}
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+	  $(am__strip_dir) \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f '$(DESTDIR)$(settingsdir)/$$f'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f "$(DESTDIR)$(settingsdir)/$$f"; \
+	done
+
+clean-settingsLTLIBRARIES:
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+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+libmanagesieve_login_settings.la: $(libmanagesieve_login_settings_la_OBJECTS) $(libmanagesieve_login_settings_la_DEPENDENCIES) $(EXTRA_libmanagesieve_login_settings_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(libmanagesieve_login_settings_la_LINK) -rpath $(settingsdir) $(libmanagesieve_login_settings_la_OBJECTS) $(libmanagesieve_login_settings_la_LIBADD) $(LIBS)
+
+managesieve-login$(EXEEXT): $(managesieve_login_OBJECTS) $(managesieve_login_DEPENDENCIES) $(EXTRA_managesieve_login_DEPENDENCIES) 
+	@rm -f managesieve-login$(EXEEXT)
+	$(AM_V_CCLD)$(managesieve_login_LINK) $(managesieve_login_OBJECTS) $(managesieve_login_LDADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
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+	-rm -f ./$(DEPDIR)/libmanagesieve_login_settings_la-managesieve-login-settings.Plo
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+	-rm -f ./$(DEPDIR)/managesieve_login-client.Po
+	-rm -f ./$(DEPDIR)/managesieve_login-managesieve-login-settings.Po
+	-rm -f ./$(DEPDIR)/managesieve_login-managesieve-proxy.Po
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am: install-settingsLTLIBRARIES
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am: install-dovecot_pkglibexecPROGRAMS
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/libmanagesieve_login_settings_la-managesieve-login-settings-plugin.Plo
+	-rm -f ./$(DEPDIR)/libmanagesieve_login_settings_la-managesieve-login-settings.Plo
+	-rm -f ./$(DEPDIR)/managesieve_login-client-authenticate.Po
+	-rm -f ./$(DEPDIR)/managesieve_login-client.Po
+	-rm -f ./$(DEPDIR)/managesieve_login-managesieve-login-settings.Po
+	-rm -f ./$(DEPDIR)/managesieve_login-managesieve-proxy.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-dovecot_pkglibexecPROGRAMS \
+	uninstall-settingsLTLIBRARIES
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-dovecot_pkglibexecPROGRAMS clean-generic clean-libtool \
+	clean-settingsLTLIBRARIES cscopelist-am ctags ctags-am \
+	distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dovecot_pkglibexecPROGRAMS install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-settingsLTLIBRARIES install-strip installcheck \
+	installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am \
+	uninstall-dovecot_pkglibexecPROGRAMS \
+	uninstall-settingsLTLIBRARIES
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/managesieve-login/client-authenticate.c b/pigeonhole/src/managesieve-login/client-authenticate.c
new file mode 100644
index 0000000..b186f84
--- /dev/null
+++ b/pigeonhole/src/managesieve-login/client-authenticate.c
@@ -0,0 +1,308 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "login-common.h"
+#include "base64.h"
+#include "buffer.h"
+#include "ioloop.h"
+#include "istream.h"
+#include "ostream.h"
+#include "safe-memset.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "auth-client.h"
+
+#include "managesieve-parser.h"
+#include "managesieve-quote.h"
+#include "client.h"
+
+#include "client-authenticate.h"
+#include "managesieve-proxy.h"
+
+
+const char *client_authenticate_get_capabilities
+(struct client *client)
+{
+	const struct auth_mech_desc *mech;
+	unsigned int i, count;
+	string_t *str;
+
+	str = t_str_new(128);
+	mech = sasl_server_get_advertised_mechs(client, &count);
+
+	for (i = 0; i < count; i++) {
+		if (i > 0)
+			str_append_c(str, ' ');
+		str_append(str, mech[i].name);
+	}
+
+	return str_c(str);
+}
+
+void managesieve_client_auth_result(struct client *client,
+				   enum client_auth_result result,
+				   const struct client_auth_reply *reply, const char *text)
+{
+	struct managesieve_client *msieve_client =
+		(struct managesieve_client *)client;
+	string_t *referral;
+
+	switch (result) {
+	case CLIENT_AUTH_RESULT_SUCCESS:
+		/* nothing to be done for IMAP */
+		break;
+	case CLIENT_AUTH_RESULT_REFERRAL_SUCCESS:
+	case CLIENT_AUTH_RESULT_REFERRAL_NOLOGIN:
+		/* MANAGESIEVE referral
+
+		   [nologin] referral host=.. [port=..] [destuser=..]
+		   [reason=..]
+
+		   NO [REFERRAL sieve://user;AUTH=mech@host:port/] "Can't login."
+		   OK [...] "Logged in, but you should use this server instead."
+		   .. [REFERRAL ..] Reason from auth server
+		*/
+		referral = t_str_new(128);
+		str_printfa(referral, "REFERRAL sieve://%s;AUTH=%s@%s",
+			    reply->destuser, client->auth_mech_name, reply->host);
+		if ( reply->port != 4190 )
+			str_printfa(referral, ":%u", reply->port);
+
+		if ( result == CLIENT_AUTH_RESULT_REFERRAL_SUCCESS ) {
+			client_send_okresp(client, str_c(referral), text);;
+		} else {
+			client_send_noresp(client, str_c(referral), text);
+		}
+		break;
+	case CLIENT_AUTH_RESULT_ABORTED:
+	case CLIENT_AUTH_RESULT_AUTHFAILED_REASON:
+	case CLIENT_AUTH_RESULT_AUTHZFAILED:
+		client_send_no(client, text);
+		break;
+	case CLIENT_AUTH_RESULT_TEMPFAIL:
+		client_send_noresp(client, "TRYLATER", text);
+		break;
+	case CLIENT_AUTH_RESULT_SSL_REQUIRED:
+		client_send_noresp(client, "ENCRYPT-NEEDED", text);
+		break;
+	case CLIENT_AUTH_RESULT_AUTHFAILED:
+	default:
+		client_send_no(client,  text);
+		break;
+	}
+
+	msieve_client->auth_response_input = NULL;
+	managesieve_parser_reset(msieve_client->parser);
+}
+
+void managesieve_client_auth_send_challenge
+(struct client *client, const char *data)
+{
+	struct managesieve_client *msieve_client =
+		(struct managesieve_client *) client;
+
+	T_BEGIN {
+		string_t *str = t_str_new(256);
+
+		managesieve_quote_append_string(str, data, TRUE);
+		str_append(str, "\r\n");
+
+		client_send_raw_data(client, str_c(str), str_len(str));
+	} T_END;
+
+	msieve_client->auth_response_input = NULL;
+	managesieve_parser_reset(msieve_client->parser);
+}
+
+static int managesieve_client_auth_read_response
+(struct managesieve_client *msieve_client, bool initial, const char **error_r)
+{
+	struct client *client = &msieve_client->common;
+	const struct managesieve_arg *args;
+	const char *error;
+	bool fatal;
+	const unsigned char *data;
+	size_t size;
+	uoff_t resp_size;
+	int ret;
+
+	*error_r = NULL;
+
+	if ( i_stream_read(client->input) == -1 ) {
+		/* disconnected */
+		client_destroy_iostream_error(client);
+		return -1;
+	}
+
+	if ( msieve_client->auth_response_input == NULL ) {
+
+		if ( msieve_client->skip_line ) {
+			if ( i_stream_next_line(client->input) == NULL )
+				return 0;
+
+			msieve_client->skip_line = FALSE;
+		}
+
+		switch ( managesieve_parser_read_args(msieve_client->parser, 0,
+			MANAGESIEVE_PARSE_FLAG_STRING_STREAM, &args) ) {
+		case -1:
+			error = managesieve_parser_get_error(msieve_client->parser, &fatal);
+			if (fatal) {
+				client_send_bye(client, error);
+				client_destroy(client, t_strconcat(
+					"parse error during auth: ", error, NULL));
+			} else {
+				*error_r = error;
+			}
+			msieve_client->skip_line = TRUE;
+			return -1;
+
+		case -2:
+			/* not enough data */
+			return 0;
+
+		default:
+			break;
+		}
+
+		if ( MANAGESIEVE_ARG_IS_EOL(&args[0]) ) {
+			if (!initial) {
+				*error_r = "Received empty AUTHENTICATE client response line.";
+				msieve_client->skip_line = TRUE;
+				return -1;
+			}
+			msieve_client->skip_line = TRUE;
+			return 1;
+		}
+
+		if ( !managesieve_arg_get_string_stream
+				(&args[0], &msieve_client->auth_response_input)
+			|| !MANAGESIEVE_ARG_IS_EOL(&args[1]) ) {
+			if ( !initial )
+				*error_r = "Invalid AUTHENTICATE client response.";
+			else
+				*error_r = "Invalid AUTHENTICATE initial response.";
+			msieve_client->skip_line = TRUE;
+			return -1;
+		}
+
+		if ( i_stream_get_size
+			(msieve_client->auth_response_input, FALSE, &resp_size) <= 0 )
+			resp_size = 0;
+
+		if (client->auth_response == NULL)
+			client->auth_response = str_new(default_pool, I_MAX(resp_size+1, 256));
+	}
+
+	while ( (ret=i_stream_read_more
+		(msieve_client->auth_response_input, &data, &size) ) > 0 ) {
+
+		if (str_len(client->auth_response) + size > LOGIN_MAX_AUTH_BUF_SIZE) {
+			client_destroy(client, "Authentication response too large");
+			return -1;
+		}
+
+		str_append_data(client->auth_response, data, size);
+		i_stream_skip(msieve_client->auth_response_input, size);
+	}
+
+	if ( ret == 0 ) return 0;
+
+	if ( msieve_client->auth_response_input->stream_errno != 0 ) {
+		if ( !client->input->eof &&
+			msieve_client->auth_response_input->stream_errno == EINVAL ) {
+			msieve_client->skip_line = TRUE;
+			*error_r = t_strconcat
+				("Error in AUTHENTICATE response string: ",
+					i_stream_get_error(msieve_client->auth_response_input), NULL);
+			return -1;
+		}
+
+		client_destroy_iostream_error(client);
+		return -1;
+	}
+
+	if ( i_stream_next_line(client->input) == NULL )
+		return 0;
+
+	return 1;
+}
+
+void managesieve_client_auth_parse_response(struct client *client)
+{
+	struct managesieve_client *msieve_client =
+		(struct managesieve_client *) client;
+	const char *error = NULL;
+	int ret;
+
+	if ( (ret=managesieve_client_auth_read_response(msieve_client, FALSE, &error))
+		< 0 ) {
+		if ( error != NULL )
+			client_auth_fail(client, error);
+		return;
+	}
+
+	if ( ret == 0 ) return;
+
+	if ( strcmp(str_c(client->auth_response), "*") == 0 ) {
+		client_auth_abort(client);
+		return;
+	}
+
+	client_auth_respond(client, str_c(client->auth_response));
+
+	memset(str_c_modifiable(client->auth_response), 0,
+	       str_len(client->auth_response));
+}
+
+int cmd_authenticate
+(struct managesieve_client *msieve_client, const struct managesieve_arg *args)
+{
+	/* NOTE: This command's input is handled specially because the
+	   SASL-IR can be large. */
+	struct client *client = &msieve_client->common;
+	const char *mech_name, *init_response;
+	const char *error;
+	int ret;
+
+	if (!msieve_client->auth_mech_name_parsed) {
+		i_assert(args != NULL);
+
+		/* one mandatory argument: authentication mechanism name */
+		if ( !managesieve_arg_get_string(&args[0], &mech_name) )
+			return -1;
+
+		if (*mech_name == '\0')
+			return -1;
+
+		i_free(client->auth_mech_name);
+		client->auth_mech_name = i_strdup(mech_name);
+		msieve_client->auth_mech_name_parsed = TRUE;
+
+		msieve_client->auth_response_input = NULL;
+		managesieve_parser_reset(msieve_client->parser);
+	}
+
+	msieve_client->skip_line = FALSE;
+	if ( (ret=managesieve_client_auth_read_response(msieve_client, TRUE, &error))
+		< 0 ) {
+		msieve_client->auth_mech_name_parsed = FALSE;
+		if ( error != NULL ) {
+			client_send_no(client, error);
+		}
+		return 1;
+	}
+
+	if ( ret == 0 ) return 0;
+
+	init_response = ( client->auth_response == NULL ? NULL :
+		t_strdup(str_c(client->auth_response)) );
+	msieve_client->auth_mech_name_parsed = FALSE;
+	if ( (ret=client_auth_begin
+		(client, t_strdup(client->auth_mech_name), init_response)) < 0 )
+		return ret;
+
+	msieve_client->cmd_finished = TRUE;
+	return 0;
+}
+
diff --git a/pigeonhole/src/managesieve-login/client-authenticate.h b/pigeonhole/src/managesieve-login/client-authenticate.h
new file mode 100644
index 0000000..1280ad5
--- /dev/null
+++ b/pigeonhole/src/managesieve-login/client-authenticate.h
@@ -0,0 +1,21 @@
+#ifndef CLIENT_AUTHENTICATE_H
+#define CLIENT_AUTHENTICATE_H
+
+struct managesieve_arg;
+
+const char *client_authenticate_get_capabilities
+	(struct client *client);
+
+void managesieve_client_auth_result
+	(struct client *client, enum client_auth_result result,
+		const struct client_auth_reply *reply, const char *text);
+
+void managesieve_client_auth_send_challenge
+	(struct client *client, const char *data);
+void managesieve_client_auth_parse_response
+	(struct client *client);
+
+int cmd_authenticate
+	(struct managesieve_client *client, const struct managesieve_arg *args);
+
+#endif
diff --git a/pigeonhole/src/managesieve-login/client.c b/pigeonhole/src/managesieve-login/client.c
new file mode 100644
index 0000000..fe8acff
--- /dev/null
+++ b/pigeonhole/src/managesieve-login/client.c
@@ -0,0 +1,574 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "login-common.h"
+#include "buffer.h"
+#include "ioloop.h"
+#include "istream.h"
+#include "ostream.h"
+#include "safe-memset.h"
+#include "str.h"
+#include "strescape.h"
+#include "base64.h"
+#include "master-service.h"
+#include "master-auth.h"
+#include "auth-client.h"
+
+#include "managesieve-parser.h"
+#include "managesieve-quote.h"
+
+#include "client.h"
+#include "client-authenticate.h"
+
+#include "managesieve-login-settings.h"
+#include "managesieve-proxy.h"
+
+/* Disconnect client when it sends too many bad commands */
+#define CLIENT_MAX_BAD_COMMANDS 3
+
+struct managesieve_command {
+	const char *name;
+	int (*func)(struct managesieve_client *client,
+		    const struct managesieve_arg *args);
+	int preparsed_args;
+};
+
+/* Skip incoming data until newline is found,
+   returns TRUE if newline was found. */
+bool client_skip_line(struct managesieve_client *client)
+{
+	const unsigned char *data;
+	size_t i, data_size;
+
+	data = i_stream_get_data(client->common.input, &data_size);
+
+	for (i = 0; i < data_size; i++) {
+		if (data[i] == '\n') {
+			i_stream_skip(client->common.input, i+1);
+			return TRUE;
+		}
+	}
+
+	return FALSE;
+}
+
+static void client_send_capabilities(struct client *client)
+{
+	struct managesieve_client *msieve_client =
+		(struct managesieve_client *)client;
+	const char *saslcap;
+
+	T_BEGIN {
+		saslcap = client_authenticate_get_capabilities(client);
+
+		/* Default capabilities */
+		client_send_raw(client, t_strconcat(
+			"\"IMPLEMENTATION\" \"",
+			msieve_client->set->managesieve_implementation_string,
+			"\"\r\n", NULL));
+		client_send_raw(client, t_strconcat(
+			"\"SIEVE\" \"",
+			msieve_client->set->managesieve_sieve_capability,
+			"\"\r\n", NULL));
+		if (msieve_client->set->managesieve_notify_capability != NULL) {
+			client_send_raw(client, t_strconcat(
+				"\"NOTIFY\" \"",
+				msieve_client->set->managesieve_notify_capability,
+				"\"\r\n", NULL));
+		}
+		client_send_raw(client, t_strconcat("\"SASL\" \"", saslcap,
+						    "\"\r\n", NULL));
+
+		/* STARTTLS */
+		if (login_ssl_initialized && !client->tls)
+			client_send_raw(client, "\"STARTTLS\"\r\n");
+
+		/* Protocol version */
+		client_send_raw(client, "\"VERSION\" \"1.0\"\r\n");
+
+		/* XCLIENT */
+		if (client->trusted)
+			client_send_raw(client, "\"XCLIENT\"\r\n");
+	} T_END;
+}
+
+static int
+cmd_capability(struct managesieve_client *client,
+	       const struct managesieve_arg *args ATTR_UNUSED)
+{
+	o_stream_cork(client->common.output);
+
+	client_send_capabilities(&client->common);
+	client_send_ok(&client->common, "Capability completed.");
+
+	o_stream_uncork(client->common.output);
+
+	return 1;
+}
+
+static int
+cmd_starttls(struct managesieve_client *client,
+	     const struct managesieve_arg *args ATTR_UNUSED)
+{
+	client_cmd_starttls(&client->common);
+	return 1;
+}
+
+static void
+managesieve_client_notify_starttls(struct client *client, bool success,
+				   const char *text)
+{
+	if (success)
+		client_send_ok(client, text);
+	else
+		client_send_no(client, text);
+}
+
+static int
+cmd_noop(struct managesieve_client *client, const struct managesieve_arg *args)
+{
+	const char *text;
+	string_t *resp_code;
+
+	if (MANAGESIEVE_ARG_IS_EOL(&args[0])) {
+		client_send_ok(&client->common, "NOOP Completed");
+		return 1;
+	}
+	if (!MANAGESIEVE_ARG_IS_EOL(&args[1]))
+		return -1;
+	if (!managesieve_arg_get_string(&args[0], &text)) {
+		client_send_no(&client->common, "Invalid echo tag.");
+		return 1;
+	}
+
+	resp_code = t_str_new(256);
+	str_append(resp_code, "TAG ");
+	managesieve_quote_append_string(resp_code, text, FALSE);
+
+	client_send_okresp(&client->common, str_c(resp_code), "Done");
+	return 1;
+}
+
+static int
+cmd_logout(struct managesieve_client *client,
+	   const struct managesieve_arg *args ATTR_UNUSED)
+{
+	client_send_ok(&client->common, "Logout completed.");
+	client_destroy(&client->common, CLIENT_UNAUTHENTICATED_LOGOUT_MSG);
+	return 1;
+}
+
+static int
+cmd_xclient_parse_forward(struct managesieve_client *client, const char *value)
+{
+	size_t value_len = strlen(value);
+
+	if (client->common.forward_fields != NULL)
+		str_truncate(client->common.forward_fields, 0);
+	else {
+		client->common.forward_fields =	str_new(
+			client->common.preproxy_pool,
+			MAX_BASE64_DECODED_SIZE(value_len));
+	}
+
+	if (base64_decode(value, value_len, NULL,
+			  client->common.forward_fields) < 0)
+		return -1;
+
+	return 0;
+}
+
+static int
+cmd_xclient(struct managesieve_client *client,
+	    const struct managesieve_arg *args)
+{
+	const char *arg;
+	bool args_ok = TRUE;
+
+	if (!client->common.trusted) {
+		client_send_no(&client->common, "You are not from trusted IP");
+		return 1;
+	}
+	while (!MANAGESIEVE_ARG_IS_EOL(&args[0]) &&
+		managesieve_arg_get_atom(&args[0], &arg)) {
+		if (strncasecmp(arg, "ADDR=", 5) == 0) {
+			if (net_addr2ip(arg + 5, &client->common.ip) < 0)
+				args_ok = FALSE;
+		} else if (strncasecmp(arg, "FORWARD=", 8)  == 0) {
+			if (cmd_xclient_parse_forward(client, arg + 8) < 0)
+				args_ok = FALSE;
+		} else if (strncasecmp(arg, "PORT=", 5) == 0) {
+			if (net_str2port(arg + 5,
+					 &client->common.remote_port) < 0)
+				args_ok = FALSE;
+		} else if (strncasecmp(arg, "SESSION=", 8) == 0) {
+			const char *value = arg + 8;
+
+			if (strlen(value) <= LOGIN_MAX_SESSION_ID_LEN) {
+				client->common.session_id =
+					p_strdup(client->common.pool, value);
+			}
+		} else if (strncasecmp(arg, "TTL=", 4)  == 0) {
+			if (str_to_uint(arg + 4, &client->common.proxy_ttl) < 0)
+				args_ok = FALSE;
+		}
+		args++;
+	}
+	if (!args_ok || !MANAGESIEVE_ARG_IS_EOL(&args[0]))
+		return -1;
+
+	client_send_ok(&client->common, "Updated");
+	return 1;
+}
+
+static struct managesieve_command commands[] = {
+	{ "AUTHENTICATE", cmd_authenticate, 1 },
+	{ "CAPABILITY", cmd_capability, -1 },
+	{ "STARTTLS", cmd_starttls, -1 },
+	{ "NOOP", cmd_noop, 0 },
+	{ "LOGOUT", cmd_logout, -1 },
+	{ "XCLIENT", cmd_xclient, 0 },
+	{ NULL, NULL, 0 }
+};
+
+static bool client_handle_input(struct managesieve_client *client)
+{
+	i_assert(!client->common.authenticating);
+
+	if (client->cmd_finished) {
+		/* Clear the previous command from memory */
+		client->cmd_name = NULL;
+		client->cmd_parsed_args = FALSE;
+		client->cmd = NULL;
+		managesieve_parser_reset(client->parser);
+
+		/* Remove \r\n */
+		if (client->skip_line) {
+			if (!client_skip_line(client))
+				return FALSE;
+			client->skip_line = FALSE;
+		}
+
+		client->cmd_finished = FALSE;
+	}
+
+	if (client->cmd == NULL) {
+		struct managesieve_command *cmd;
+		const char *cmd_name;
+
+		client->cmd_name = managesieve_parser_read_word(client->parser);
+		if (client->cmd_name == NULL)
+			return FALSE; /* Need more data */
+
+		cmd_name = t_str_ucase(client->cmd_name);
+		cmd = commands;
+		while (cmd->name != NULL) {
+			if (strcmp(cmd->name, cmd_name) == 0)
+				break;
+			cmd++;
+		}
+
+		if (cmd->name != NULL)
+			client->cmd = cmd;
+		else
+			client->skip_line = TRUE;
+	}
+	return client->common.v.input_next_cmd(&client->common);
+}
+
+static bool managesieve_client_input_next_cmd(struct client *_client)
+{
+	struct managesieve_client *client =
+		(struct managesieve_client *)_client;
+	const struct managesieve_arg *args = NULL;
+	const char *msg;
+	int ret = 1;
+	bool fatal;
+
+	if (client->cmd == NULL) {
+		/* Unknown command */
+		ret = -1;
+	} else if (!client->cmd_parsed_args) {
+		unsigned int arg_count =
+			(client->cmd->preparsed_args > 0 ?
+			 client->cmd->preparsed_args : 0);
+
+		switch (managesieve_parser_read_args(client->parser, arg_count,
+						     0, &args)) {
+		case -1:
+			/* Error */
+			msg = managesieve_parser_get_error(client->parser,
+							   &fatal);
+			if (fatal) {
+				client_send_bye(&client->common, msg);
+				client_destroy(&client->common, msg);
+				return FALSE;
+			}
+			client_send_no(&client->common, msg);
+			client->cmd_finished = TRUE;
+			client->skip_line = TRUE;
+			return TRUE;
+		case -2:
+			/* Not enough data */
+			return FALSE;
+		}
+		i_assert(args != NULL);
+
+		if (arg_count == 0) {
+			/* We read the entire line - skip over the CRLF */
+			if (!client_skip_line(client))
+				i_unreached();
+		} else {
+			/* Get rid of it later */
+			client->skip_line = TRUE;
+		}
+
+		client->cmd_parsed_args = TRUE;
+
+		if (client->cmd->preparsed_args == -1) {
+			/* Check absence of arguments */
+			if (args[0].type != MANAGESIEVE_ARG_EOL)
+				ret = -1;
+		}
+	}
+	if (ret > 0) {
+		i_assert(client->cmd != NULL);
+		ret = client->cmd->func(client, args);
+	}
+
+	if (ret != 0)
+		client->cmd_finished = TRUE;
+	if (ret < 0) {
+		if (++client->common.bad_counter >= CLIENT_MAX_BAD_COMMANDS) {
+			client_send_bye(&client->common,
+				"Too many invalid MANAGESIEVE commands.");
+			client_destroy(&client->common,
+				       "Too many invalid commands.");
+			return FALSE;
+		}
+		client_send_no(&client->common,
+			"Error in MANAGESIEVE command received by server.");
+	}
+
+	return ret != 0 && !client->common.destroyed;
+}
+
+static void managesieve_client_input(struct client *client)
+{
+	struct managesieve_client *managesieve_client =
+		(struct managesieve_client *)client;
+
+	if (!client_read(client))
+		return;
+
+	client_ref(client);
+	o_stream_cork(managesieve_client->common.output);
+	for (;;) {
+		if (!auth_client_is_connected(auth_client)) {
+			/* We're not currently connected to auth process -
+			   don't allow any commands */
+			/* FIXME: Can't do untagged responses with managesieve.
+			   Any other ways?
+			   client_send_ok(client, AUTH_SERVER_WAITING_MSG);
+			*/
+			timeout_remove(&client->to_auth_waiting);
+
+			client->input_blocked = TRUE;
+			break;
+		} else {
+			if (!client_handle_input(managesieve_client))
+				break;
+		}
+	}
+	o_stream_uncork(managesieve_client->common.output);
+	client_unref(&client);
+}
+
+static struct client *managesieve_client_alloc(pool_t pool)
+{
+	struct managesieve_client *msieve_client;
+
+	msieve_client = p_new(pool, struct managesieve_client, 1);
+	return &msieve_client->common;
+}
+
+static void managesieve_client_create(struct client *client, void **other_sets)
+{
+	struct managesieve_client *msieve_client =
+		(struct managesieve_client *)client;
+
+	msieve_client->set = other_sets[0];
+	msieve_client->parser = managesieve_parser_create(
+		msieve_client->common.input, MAX_MANAGESIEVE_LINE);
+	client->io = io_add(client->fd, IO_READ, client_input, client);
+}
+
+static void managesieve_client_destroy(struct client *client)
+{
+	struct managesieve_client *managesieve_client =
+		(struct managesieve_client *)client;
+
+	managesieve_parser_destroy(&managesieve_client->parser);
+}
+
+static void managesieve_client_notify_auth_ready(struct client *client)
+{
+	/* Cork the stream to send the capability data as a single tcp frame
+	   Some naive clients break if we don't.
+	 */
+	o_stream_cork(client->output);
+
+	/* Send initial capabilities */
+	client_send_capabilities(client);
+	client_send_ok(client, client->set->login_greeting);
+
+	o_stream_uncork(client->output);
+
+	client->banner_sent = TRUE;
+}
+
+static void managesieve_client_starttls(struct client *client)
+{
+	struct managesieve_client *msieve_client =
+		(struct managesieve_client *)client;
+
+	managesieve_parser_destroy(&msieve_client->parser);
+	msieve_client->parser = managesieve_parser_create(
+		msieve_client->common.input, MAX_MANAGESIEVE_LINE);
+
+	/* CRLF is lost from buffer when streams are reopened. */
+	msieve_client->skip_line = FALSE;
+
+	/* Cork the stream to send the capability data as a single tcp frame
+	   Some naive clients break if we don't.
+	 */
+	o_stream_cork(client->output);
+
+	client_send_capabilities(client);
+	client_send_ok(client, "TLS negotiation successful.");
+
+	o_stream_uncork(client->output);
+}
+
+static void
+client_send_reply_raw(struct client *client, const char *prefix,
+		      const char *resp_code, const char *text)
+{
+	T_BEGIN {
+		string_t *line = t_str_new(256);
+
+		str_append(line, prefix);
+
+		if (resp_code != NULL) {
+			str_append(line, " (");
+			str_append(line, resp_code);
+			str_append_c(line, ')');
+		}
+
+		if (text != NULL) {
+			str_append_c(line, ' ');
+			managesieve_quote_append_string(line, text, TRUE);
+		}
+
+		str_append(line, "\r\n");
+
+		client_send_raw_data(client, str_data(line), str_len(line));
+	} T_END;
+}
+
+void client_send_reply_code(struct client *client,
+			    enum managesieve_cmd_reply reply,
+			    const char *resp_code, const char *text)
+{
+	const char *prefix = "NO";
+
+	switch (reply) {
+	case MANAGESIEVE_CMD_REPLY_OK:
+		prefix = "OK";
+		break;
+	case MANAGESIEVE_CMD_REPLY_NO:
+		break;
+	case MANAGESIEVE_CMD_REPLY_BYE:
+		prefix = "BYE";
+		break;
+	}
+
+	client_send_reply_raw(client, prefix, resp_code, text);
+}
+
+void client_send_reply(struct client *client, enum managesieve_cmd_reply reply,
+		       const char *text)
+{
+	client_send_reply_code(client, reply, NULL, text);
+}
+
+static void
+managesieve_client_notify_disconnect(struct client *client,
+				     enum client_disconnect_reason reason,
+				     const char *text)
+{
+	if (reason == CLIENT_DISCONNECT_SYSTEM_SHUTDOWN) {
+		client_send_reply_code(client, MANAGESIEVE_CMD_REPLY_BYE,
+				       "TRYLATER", text);
+	} else {
+		client_send_reply_code(client, MANAGESIEVE_CMD_REPLY_BYE,
+				       NULL, text);
+	}
+}
+
+static void managesieve_login_preinit(void)
+{
+	login_set_roots = managesieve_login_settings_set_roots;
+}
+
+static void managesieve_login_init(void)
+{
+}
+
+static void managesieve_login_deinit(void)
+{
+	clients_destroy_all();
+}
+
+static struct client_vfuncs managesieve_client_vfuncs = {
+	.alloc = managesieve_client_alloc,
+	.create = managesieve_client_create,
+	.destroy = managesieve_client_destroy,
+	.notify_auth_ready = managesieve_client_notify_auth_ready,
+	.notify_disconnect = managesieve_client_notify_disconnect,
+	.notify_starttls = managesieve_client_notify_starttls,
+	.starttls = managesieve_client_starttls,
+	.input = managesieve_client_input,
+	.auth_send_challenge = managesieve_client_auth_send_challenge,
+	.auth_parse_response = managesieve_client_auth_parse_response,
+	.auth_result = managesieve_client_auth_result,
+	.proxy_reset = managesieve_proxy_reset,
+	.proxy_parse_line = managesieve_proxy_parse_line,
+	.proxy_failed = managesieve_proxy_failed,
+	.proxy_get_state = managesieve_proxy_get_state,
+	.send_raw_data = client_common_send_raw_data,
+	.input_next_cmd = managesieve_client_input_next_cmd,
+	.free = client_common_default_free,
+};
+
+static struct login_binary managesieve_login_binary = {
+	.protocol = "sieve",
+	.process_name = "managesieve-login",
+	.default_port = 4190,
+
+	.event_category = {
+		.name = "managesieve",
+	},
+
+	.client_vfuncs = &managesieve_client_vfuncs,
+	.preinit = managesieve_login_preinit,
+	.init = managesieve_login_init,
+	.deinit = managesieve_login_deinit,
+
+	.anonymous_login_acceptable = FALSE,
+};
+
+int main(int argc, char *argv[])
+{
+	return login_binary_run(&managesieve_login_binary, argc, argv);
+}
diff --git a/pigeonhole/src/managesieve-login/client.h b/pigeonhole/src/managesieve-login/client.h
new file mode 100644
index 0000000..a04190d
--- /dev/null
+++ b/pigeonhole/src/managesieve-login/client.h
@@ -0,0 +1,76 @@
+#ifndef CLIENT_H
+#define CLIENT_H
+
+#include "net.h"
+#include "client-common.h"
+
+/* maximum length for managesieve command line. */
+#define MAX_MANAGESIEVE_LINE 8192
+
+enum managesieve_proxy_state {
+	MSIEVE_PROXY_STATE_NONE,
+	MSIEVE_PROXY_STATE_TLS_START,
+	MSIEVE_PROXY_STATE_TLS_READY,
+	MSIEVE_PROXY_STATE_XCLIENT,
+	MSIEVE_PROXY_STATE_AUTH,
+
+	MSIEVE_PROXY_STATE_COUNT
+};
+struct managesieve_command;
+
+struct managesieve_client {
+	struct client common;
+
+	const struct managesieve_login_settings *set;
+	struct managesieve_parser *parser;
+
+	enum managesieve_proxy_state proxy_state;
+
+	const char *cmd_name;
+	struct managesieve_command *cmd;
+
+	struct istream *auth_response_input;
+
+	bool cmd_finished:1;
+	bool cmd_parsed_args:1;
+	bool skip_line:1;
+	bool auth_mech_name_parsed:1;
+
+	bool proxy_starttls:1;
+	bool proxy_sasl:1;
+	bool proxy_xclient:1;
+};
+
+bool client_skip_line(struct managesieve_client *client);
+
+enum managesieve_cmd_reply {
+	MANAGESIEVE_CMD_REPLY_OK,
+	MANAGESIEVE_CMD_REPLY_NO,
+	MANAGESIEVE_CMD_REPLY_BYE
+};
+
+void client_send_reply(struct client *client, enum managesieve_cmd_reply reply,
+		       const char *text);
+
+void client_send_reply_code(struct client *client,
+			    enum managesieve_cmd_reply reply,
+			    const char *resp_code, const char *text);
+
+#define client_send_ok(client, text) \
+	client_send_reply(client, MANAGESIEVE_CMD_REPLY_OK, text)
+#define client_send_no(client, text) \
+	client_send_reply(client, MANAGESIEVE_CMD_REPLY_NO, text)
+#define client_send_bye(client, text) \
+	client_send_reply(client, MANAGESIEVE_CMD_REPLY_BYE, text)
+
+#define client_send_okresp(client, resp_code, text) \
+	client_send_reply_code(client, MANAGESIEVE_CMD_REPLY_OK, \
+			       resp_code, text)
+#define client_send_noresp(client, resp_code, text) \
+	client_send_reply_code(client, MANAGESIEVE_CMD_REPLY_NO, \
+			       resp_code, text)
+#define client_send_byeresp(client, resp_code, text) \
+	client_send_reply_code(client, MANAGESIEVE_CMD_REPLY_BYE, \
+			       resp_code, text)
+
+#endif
diff --git a/pigeonhole/src/managesieve-login/managesieve-login-settings-plugin.c b/pigeonhole/src/managesieve-login/managesieve-login-settings-plugin.c
new file mode 100644
index 0000000..12515cd
--- /dev/null
+++ b/pigeonhole/src/managesieve-login/managesieve-login-settings-plugin.c
@@ -0,0 +1,223 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "buffer.h"
+#include "env-util.h"
+#include "execv-const.h"
+#include "master-service.h"
+#include "settings-parser.h"
+#include "config-parser-private.h"
+#include "managesieve-login-settings-plugin.h"
+
+#include <stddef.h>
+#include <unistd.h>
+#include <sys/wait.h>
+#include <sysexits.h>
+
+typedef enum { CAP_SIEVE, CAP_NOTIFY } capability_type_t;
+
+bool capability_dumped = FALSE;
+static char *capability_sieve = NULL;
+static char *capability_notify = NULL;
+
+static void (*next_hook_config_parser_begin)(struct config_parser_context *ctx) = NULL;
+
+static void managesieve_login_config_parser_begin(struct config_parser_context *ctx);
+
+const char *managesieve_login_settings_version = DOVECOT_ABI_VERSION;
+
+void managesieve_login_settings_init(struct module *module ATTR_UNUSED)
+{
+	next_hook_config_parser_begin = hook_config_parser_begin;
+	hook_config_parser_begin = managesieve_login_config_parser_begin;
+}
+
+void managesieve_login_settings_deinit(void)
+{
+	hook_config_parser_begin = next_hook_config_parser_begin;
+
+	if ( capability_sieve != NULL )
+		i_free(capability_sieve);
+
+	if ( capability_notify != NULL )
+		i_free(capability_notify);
+}
+
+static void capability_store(capability_type_t cap_type, const char *value)
+{
+	switch ( cap_type ) {
+	case CAP_SIEVE:
+		capability_sieve = i_strdup(value);
+		break;
+	case CAP_NOTIFY:
+		capability_notify = i_strdup(value);
+		break;
+	}
+}
+
+static void capability_parse(const char *cap_string)
+{
+	capability_type_t cap_type = CAP_SIEVE;
+	const char *p = cap_string;
+	string_t *part = t_str_new(256);
+
+	if ( cap_string == NULL || *cap_string == '\0' ) {
+		i_warning("managesieve-login: capability string is empty.");
+		return;
+	}
+
+	while ( *p != '\0' ) {
+		if ( *p == '\\' ) {
+			p++;
+			if ( *p != '\0' ) {
+				str_append_c(part, *p);
+				p++;
+			} else break;
+		} else if ( *p == ':' ) {
+			if ( strcasecmp(str_c(part), "SIEVE") == 0 )
+				cap_type = CAP_SIEVE;
+			else if ( strcasecmp(str_c(part), "NOTIFY") == 0 )
+				cap_type = CAP_NOTIFY;
+			else
+				i_warning("managesieve-login: unknown capability '%s' listed in "
+					"capability string (ignored).", str_c(part));
+			str_truncate(part, 0);
+		} else if ( *p == ',' ) {
+			capability_store(cap_type, str_c(part));
+			str_truncate(part, 0);
+		} else {
+			/* Append character, but omit leading spaces */
+			if ( str_len(part) > 0 || *p != ' ' )
+				str_append_c(part, *p);
+		}
+		p++;
+	}
+
+	if ( str_len(part) > 0 ) {
+		capability_store(cap_type, str_c(part));
+	}
+}
+
+static bool capability_dump(void)
+{
+	char buf[4096];
+	int fd[2], status = 0;
+	ssize_t ret;
+	unsigned int pos;
+	pid_t pid;
+
+	if ( getenv("DUMP_CAPABILITY") != NULL )
+		return TRUE;
+
+	if ( pipe(fd) < 0 ) {
+		i_error("managesieve-login: dump-capability pipe() failed: %m");
+		return FALSE;
+	}
+	fd_close_on_exec(fd[0], TRUE);
+	fd_close_on_exec(fd[1], TRUE);
+
+	if ( (pid = fork()) == (pid_t)-1 ) {
+		(void)close(fd[0]); (void)close(fd[1]);
+		i_error("managesieve-login: dump-capability fork() failed: %m");
+		return FALSE;
+	}
+
+	if ( pid == 0 ) {
+		const char *argv[5];
+
+		/* Child */
+		(void)close(fd[0]);
+
+		if (dup2(fd[1], STDOUT_FILENO) < 0)
+			i_fatal("managesieve-login: dump-capability dup2() failed: %m");
+
+		env_put("DUMP_CAPABILITY", "1");
+
+		argv[0] = PKG_LIBEXECDIR"/managesieve";
+		argv[1] = "-k";
+		argv[2] = "-c";
+		argv[3] = master_service_get_config_path(master_service);
+		argv[4] = NULL;
+		execv_const(argv[0], argv);
+
+		i_fatal("managesieve-login: dump-capability execv(%s) failed: %m", argv[0]);
+	}
+
+	(void)close(fd[1]);
+
+	alarm(60);
+	if (wait(&status) == -1) {
+		i_error("managesieve-login: dump-capability failed: process %d got stuck",
+			(int)pid);
+		return FALSE;
+	}
+	alarm(0);
+
+	if (status != 0) {
+		(void)close(fd[0]);
+		if (WIFSIGNALED(status)) {
+			i_error("managesieve-login: dump-capability process "
+				"killed with signal %d", WTERMSIG(status));
+		} else {
+			i_error("managesieve-login: dump-capability process returned %d",
+				WIFEXITED(status) ? WEXITSTATUS(status) : status);
+		}
+		return FALSE;
+	}
+
+	pos = 0;
+	while ((ret = read(fd[0], buf + pos, sizeof(buf) - pos)) > 0)
+		pos += ret;
+
+	if (ret < 0) {
+		i_error("managesieve-login: read(dump-capability process) failed: %m");
+		(void)close(fd[0]);
+		return FALSE;
+	}
+	(void)close(fd[0]);
+
+	if (pos == 0 || buf[pos-1] != '\n') {
+		i_error("managesieve-login: dump-capability: Couldn't read capability "
+			"(got %u bytes)", pos);
+		return FALSE;
+	}
+	buf[pos-1] = '\0';
+
+	capability_parse(buf);
+
+	return TRUE;
+}
+
+static void managesieve_login_config_set
+(struct config_parser_context *ctx, const char *key, const char *value)
+{
+	config_apply_line(ctx, key, t_strdup_printf("%s=%s", key, value), NULL);
+}
+
+static void managesieve_login_config_parser_begin(struct config_parser_context *ctx)
+{	
+	const char *const *module = ctx->modules;
+
+	if ( module != NULL && *module != NULL ) {
+		while ( *module != NULL ) {
+			if ( strcmp(*module, "managesieve-login") == 0 )
+				break;
+			module++;
+		}
+		if ( *module == NULL )
+			return;
+	}
+
+	if ( !capability_dumped ) {
+		(void)capability_dump();
+		capability_dumped = TRUE;
+	}
+
+	if ( capability_sieve != NULL )
+		managesieve_login_config_set(ctx, "managesieve_sieve_capability", capability_sieve);
+
+	if ( capability_notify != NULL )
+		managesieve_login_config_set(ctx, "managesieve_notify_capability", capability_notify);
+}
diff --git a/pigeonhole/src/managesieve-login/managesieve-login-settings-plugin.h b/pigeonhole/src/managesieve-login/managesieve-login-settings-plugin.h
new file mode 100644
index 0000000..ebefe1a
--- /dev/null
+++ b/pigeonhole/src/managesieve-login/managesieve-login-settings-plugin.h
@@ -0,0 +1,9 @@
+#ifndef MANAGESIEVE_LOGIN_SETTINGS_PLUGIN_H
+#define MANAGESIEVE_LOGIN_SETTINGS_PLUGIN_H
+
+#include "lib.h"
+
+void managesieve_login_settings_init(struct module *module);
+void managesieve_login_settings_deinit(void);
+
+#endif
diff --git a/pigeonhole/src/managesieve-login/managesieve-login-settings.c b/pigeonhole/src/managesieve-login/managesieve-login-settings.c
new file mode 100644
index 0000000..9146d03
--- /dev/null
+++ b/pigeonhole/src/managesieve-login/managesieve-login-settings.c
@@ -0,0 +1,104 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "buffer.h"
+#include "env-util.h"
+#include "execv-const.h"
+#include "settings-parser.h"
+#include "service-settings.h"
+#include "login-settings.h"
+
+#include "pigeonhole-config.h"
+
+#include "managesieve-login-settings.h"
+
+#include <stddef.h>
+#include <unistd.h>
+#include <sys/wait.h>
+#include <sysexits.h>
+
+/* <settings checks> */
+
+static struct inet_listener_settings managesieve_login_inet_listeners_array[] = {
+    { .name = "sieve", .address = "", .port = 4190 },
+};
+static struct inet_listener_settings *managesieve_login_inet_listeners[] = {
+	&managesieve_login_inet_listeners_array[0]
+};
+static buffer_t managesieve_login_inet_listeners_buf = {
+	{ { managesieve_login_inet_listeners,
+	    sizeof(managesieve_login_inet_listeners) } }
+};
+/* </settings checks> */
+
+struct service_settings managesieve_login_settings_service_settings = {
+	.name = "managesieve-login",
+	.protocol = "sieve",
+	.type = "login",
+	.executable = "managesieve-login",
+	.user = "$default_login_user",
+	.group = "",
+	.privileged_group = "",
+	.extra_groups = "",
+	.chroot = "login",
+
+	.drop_priv_before_exec = FALSE,
+
+	.process_min_avail = 0,
+	.process_limit = 0,
+	.client_limit = 0,
+	.service_count = 1,
+	.idle_kill = 0,
+	.vsz_limit = (uoff_t)-1,
+
+	.unix_listeners = ARRAY_INIT,
+	.fifo_listeners = ARRAY_INIT,
+	.inet_listeners = { { &managesieve_login_inet_listeners_buf,
+		sizeof(managesieve_login_inet_listeners[0]) } }
+};
+
+#undef DEF
+#define DEF(type, name) \
+	SETTING_DEFINE_STRUCT_##type(#name, name, struct managesieve_login_settings)
+
+static const struct setting_define managesieve_login_setting_defines[] = {
+	DEF(STR, managesieve_implementation_string),
+	DEF(STR, managesieve_sieve_capability),
+	DEF(STR, managesieve_notify_capability),
+
+	SETTING_DEFINE_LIST_END
+};
+
+static const struct managesieve_login_settings managesieve_login_default_settings = {
+	.managesieve_implementation_string = DOVECOT_NAME " " PIGEONHOLE_NAME,
+	.managesieve_sieve_capability = "",
+	.managesieve_notify_capability = NULL
+};
+
+static const struct setting_parser_info *managesieve_login_setting_dependencies[] = {
+	&login_setting_parser_info,
+	NULL
+};
+
+static const struct setting_parser_info managesieve_login_setting_parser_info = {
+	.module_name = "managesieve-login",
+	.defines = managesieve_login_setting_defines,
+	.defaults = &managesieve_login_default_settings,
+
+	.type_offset = (size_t)-1,
+	.struct_size = sizeof(struct managesieve_login_settings),
+
+	.parent_offset = (size_t)-1,
+	.parent = NULL,
+
+	.dependencies = managesieve_login_setting_dependencies
+};
+
+const struct setting_parser_info *managesieve_login_settings_set_roots[] = {
+	&login_setting_parser_info,
+	&managesieve_login_setting_parser_info,
+	NULL
+};
+
diff --git a/pigeonhole/src/managesieve-login/managesieve-login-settings.h b/pigeonhole/src/managesieve-login/managesieve-login-settings.h
new file mode 100644
index 0000000..c6f4826
--- /dev/null
+++ b/pigeonhole/src/managesieve-login/managesieve-login-settings.h
@@ -0,0 +1,17 @@
+#ifndef MANAGESIEVE_LOGIN_SETTINGS_H
+#define MANAGESIEVE_LOGIN_SETTINGS_H
+
+struct managesieve_login_settings {
+	const char *managesieve_implementation_string;
+	const char *managesieve_sieve_capability;
+	const char *managesieve_notify_capability;
+};
+
+extern const struct setting_parser_info *managesieve_login_settings_set_roots[];
+
+#ifdef _CONFIG_PLUGIN
+void managesieve_login_settings_init(void);
+void managesieve_login_settings_deinit(void);
+#endif
+
+#endif
diff --git a/pigeonhole/src/managesieve-login/managesieve-proxy.c b/pigeonhole/src/managesieve-login/managesieve-proxy.c
new file mode 100644
index 0000000..50e31ae
--- /dev/null
+++ b/pigeonhole/src/managesieve-login/managesieve-proxy.c
@@ -0,0 +1,686 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include <string.h>
+#include "login-common.h"
+#include "ioloop.h"
+#include "istream.h"
+#include "ostream.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "strescape.h"
+#include "safe-memset.h"
+#include "buffer.h"
+#include "base64.h"
+#include "dsasl-client.h"
+
+#include "client.h"
+#include "client-authenticate.h"
+
+#include "managesieve-quote.h"
+#include "managesieve-proxy.h"
+#include "managesieve-parser.h"
+
+typedef enum {
+	MANAGESIEVE_RESPONSE_NONE,
+	MANAGESIEVE_RESPONSE_OK,
+	MANAGESIEVE_RESPONSE_NO,
+	MANAGESIEVE_RESPONSE_BYE
+} managesieve_response_t;
+
+static const char *managesieve_proxy_state_names[MSIEVE_PROXY_STATE_COUNT] = {
+	"none", "tls-start", "tls-ready", "xclient", "auth"
+};
+
+static string_t *
+proxy_compose_xclient_forward(struct managesieve_client *client)
+{
+	const char *const *arg;
+	string_t *str;
+
+	if (*client->common.auth_passdb_args == NULL)
+		return NULL;
+
+	str = t_str_new(128);
+	for (arg = client->common.auth_passdb_args; *arg != NULL; arg++) {
+		if (strncasecmp(*arg, "forward_", 8) == 0) {
+			if (str_len(str) > 0)
+				str_append_c(str, '\t');
+			str_append_tabescaped(str, (*arg)+8);
+		}
+	}
+	if (str_len(str) == 0)
+		return NULL;
+
+	return str;
+}
+
+static void
+proxy_write_xclient(struct managesieve_client *client, string_t *str)
+{
+	string_t *fwd = proxy_compose_xclient_forward(client);
+
+	str_printfa(str, "XCLIENT ADDR=%s PORT=%u SESSION=%s TTL=%u",
+		    net_ip2addr(&client->common.ip), client->common.remote_port,
+		    client_get_session_id(&client->common),
+		    client->common.proxy_ttl - 1);
+	if (fwd != NULL) {
+		str_append(str, " FORWARD=");
+		base64_encode(str_data(fwd), str_len(fwd), str);
+	}
+	str_append(str, "\r\n");
+}
+
+static void
+proxy_write_auth_data(const unsigned char *data, unsigned int data_len,
+		      string_t *str)
+{
+	if (data_len == 0)
+		str_append(str, "\"\"");
+	else {
+		string_t *data_str = t_str_new(128);
+		base64_encode(data, data_len, data_str);
+		managesieve_quote_append_string(str, str_c(data_str), FALSE);
+	}
+}
+
+static int
+proxy_write_auth(struct managesieve_client *client, string_t *str)
+{
+	struct dsasl_client_settings sasl_set;
+	const unsigned char *output;
+	size_t len;
+	const char *mech_name, *error;
+
+	i_assert(client->common.proxy_ttl > 1);
+
+	if (!client->proxy_sasl) {
+		/* Prevent sending credentials to a server that has login
+		   disabled; i.e., due to the lack of TLS */
+		login_proxy_failed(client->common.login_proxy,
+			login_proxy_get_event(client->common.login_proxy),
+			LOGIN_PROXY_FAILURE_TYPE_REMOTE_CONFIG,
+			"Server has disabled authentication (TLS required?)");
+		return -1;
+	}
+
+	if (client->common.proxy_mech == NULL)
+		client->common.proxy_mech = &dsasl_client_mech_plain;
+
+	i_assert(client->common.proxy_sasl_client == NULL);
+	i_zero(&sasl_set);
+	sasl_set.authid = (client->common.proxy_master_user != NULL ?
+			   client->common.proxy_master_user :
+			   client->common.proxy_user);
+	sasl_set.authzid = client->common.proxy_user;
+	sasl_set.password = client->common.proxy_password;
+	client->common.proxy_sasl_client =
+		dsasl_client_new(client->common.proxy_mech, &sasl_set);
+	mech_name = dsasl_client_mech_get_name(client->common.proxy_mech);
+
+	str_append(str, "AUTHENTICATE ");
+	managesieve_quote_append_string(str, mech_name, FALSE);
+	if (dsasl_client_output(client->common.proxy_sasl_client,
+				&output, &len, &error) < 0) {
+		const char *reason = t_strdup_printf(
+			"SASL mechanism %s init failed: %s",
+			mech_name, error);
+		login_proxy_failed(client->common.login_proxy,
+			login_proxy_get_event(client->common.login_proxy),
+			LOGIN_PROXY_FAILURE_TYPE_INTERNAL, reason);
+		return -1;
+	}
+	if (len > 0) {
+		str_append_c(str, ' ');
+		proxy_write_auth_data(output, len, str);
+	}
+	str_append(str, "\r\n");
+	return 0;
+}
+
+static int
+proxy_input_auth_challenge(struct managesieve_client *client, const char *line,
+			   const char **challenge_r)
+{
+	struct istream *input;
+	struct managesieve_parser *parser;
+ 	const struct managesieve_arg *args;
+	const char *challenge;
+	bool fatal = FALSE;
+	int ret;
+
+	i_assert(client->common.proxy_sasl_client != NULL);
+	*challenge_r = NULL;
+
+	/* Build an input stream for the managesieve parser.
+	   FIXME: Ugly, see proxy_input_capability().
+	 */
+	line = t_strconcat(line, "\r\n", NULL);
+	input = i_stream_create_from_data(line, strlen(line));
+	parser = managesieve_parser_create(input, MAX_MANAGESIEVE_LINE);
+	managesieve_parser_reset(parser);
+
+	(void)i_stream_read(input);
+	ret = managesieve_parser_read_args(parser, 1, 0, &args);
+
+	if (ret >= 0) {
+		if (ret > 0 &&
+		    managesieve_arg_get_string(&args[0], &challenge)) {
+			*challenge_r = t_strdup(challenge);
+		} else {
+			const char *reason = t_strdup_printf(
+				"Server sent invalid SASL challenge line: %s",
+				str_sanitize(line,160));
+			login_proxy_failed(client->common.login_proxy,
+				login_proxy_get_event(client->common.login_proxy),
+				LOGIN_PROXY_FAILURE_TYPE_PROTOCOL, reason);
+			fatal = TRUE;
+		}
+
+	} else if (ret == -2) {
+		/* Parser needs more data (not possible on mem stream) */
+		i_unreached();
+
+	} else {
+		const char *error_str =
+			managesieve_parser_get_error(parser, &fatal);
+		error_str = (error_str != NULL ? error_str : "unknown (bug)");
+
+		/* Do not accept faulty server */
+		const char *reason = t_strdup_printf(
+			"Protocol parse error(%d) int SASL challenge line: %s "
+			"(line=`%s')", ret, error_str, line);
+		login_proxy_failed(client->common.login_proxy,
+			login_proxy_get_event(client->common.login_proxy),
+			LOGIN_PROXY_FAILURE_TYPE_PROTOCOL, reason);
+		fatal = TRUE;
+	}
+
+
+	/* Cleanup parser */
+	managesieve_parser_destroy(&parser);
+	i_stream_destroy(&input);
+
+	/* Time to exit if greeting was not accepted */
+	if (fatal)
+		return -1;
+	return 0;
+}
+
+static int
+proxy_write_auth_response(struct managesieve_client *client,
+			  const char *challenge, string_t *str)
+{
+	const unsigned char *data;
+	size_t data_len;
+	const char *error;
+	int ret;
+
+	if (base64_decode(challenge, strlen(challenge), NULL, str) < 0) {
+		login_proxy_failed(client->common.login_proxy,
+			login_proxy_get_event(client->common.login_proxy),
+			LOGIN_PROXY_FAILURE_TYPE_PROTOCOL,
+			"Server sent invalid base64 data in AUTHENTICATE response");
+		return -1;
+	}
+	ret = dsasl_client_input(client->common.proxy_sasl_client,
+				 str_data(str), str_len(str), &error);
+	if (ret == 0) {
+		ret = dsasl_client_output(client->common.proxy_sasl_client,
+					  &data, &data_len, &error);
+	}
+	if (ret < 0) {
+		const char *reason = t_strdup_printf(
+			"Server sent invalid authentication data: %s", error);
+		login_proxy_failed(client->common.login_proxy,
+			login_proxy_get_event(client->common.login_proxy),
+			LOGIN_PROXY_FAILURE_TYPE_PROTOCOL, reason);
+		return -1;
+	}
+	i_assert(ret == 0);
+
+	str_truncate(str, 0);
+	proxy_write_auth_data(data, data_len, str);
+	str_append(str, "\r\n");
+	return 0;
+}
+
+static managesieve_response_t
+proxy_read_response(const struct managesieve_arg *args)
+{
+	const char *response;
+
+	if (managesieve_arg_get_atom(&args[0], &response)) {
+		if (strcasecmp(response, "OK") == 0) {
+			/* Received OK response; greeting is finished */
+			return MANAGESIEVE_RESPONSE_OK;
+
+		} else if (strcasecmp(response, "NO") == 0) {
+			/* Received OK response; greeting is finished */
+			return MANAGESIEVE_RESPONSE_NO;
+
+		} else if (strcasecmp(response, "BYE") == 0) {
+			/* Received OK response; greeting is finished */
+			return MANAGESIEVE_RESPONSE_BYE;
+		}
+	}
+	return MANAGESIEVE_RESPONSE_NONE;
+}
+
+static int
+proxy_input_capability(struct managesieve_client *client, const char *line,
+		       managesieve_response_t *resp_r)
+{
+	struct istream *input;
+	struct managesieve_parser *parser;
+ 	const struct managesieve_arg *args;
+	const char *capability;
+	int ret;
+	bool fatal = FALSE;
+
+	*resp_r = MANAGESIEVE_RESPONSE_NONE;
+
+	/* Build an input stream for the managesieve parser
+
+	   FIXME: It would be nice if the line-wise parsing could be substituded
+	          by something similar to the command line interpreter. However,
+	          the current login_proxy structure does not make streams known
+		  until inside proxy_input handler.
+	 */
+	line = t_strconcat(line, "\r\n", NULL);
+	input = i_stream_create_from_data(line, strlen(line));
+	parser = managesieve_parser_create(input, MAX_MANAGESIEVE_LINE);
+	managesieve_parser_reset(parser);
+
+	/* Parse input
+
+	   FIXME: Theoretically the OK response could include a response code
+	          which could be rejected by the parser.
+	 */
+	(void)i_stream_read(input);
+	ret = managesieve_parser_read_args(parser, 2, 0, &args);
+
+	if (ret == 0) {
+		const char *reason = t_strdup_printf(
+			"Remote returned with invalid capability/greeting line: %s",
+			str_sanitize(line,160));
+		login_proxy_failed(client->common.login_proxy,
+			login_proxy_get_event(client->common.login_proxy),
+			LOGIN_PROXY_FAILURE_TYPE_PROTOCOL, reason);
+		fatal = TRUE;
+	} else if (ret > 0) {
+		if (args[0].type == MANAGESIEVE_ARG_ATOM) {
+			*resp_r = proxy_read_response(args);
+
+			if (*resp_r == MANAGESIEVE_RESPONSE_NONE) {
+				const char *reason = t_strdup_printf(
+					"Remote sent invalid response: %s",
+					str_sanitize(line,160));
+				login_proxy_failed(client->common.login_proxy,
+					login_proxy_get_event(client->common.login_proxy),
+					LOGIN_PROXY_FAILURE_TYPE_PROTOCOL,
+					reason);
+
+				fatal = TRUE;
+			}
+		} else if (managesieve_arg_get_string(&args[0], &capability)) {
+			if (strcasecmp(capability, "SASL") == 0) {
+				const char *sasl_mechs;
+
+				/* Check whether the server supports the SASL mechanism
+				   we are going to use (currently only PLAIN supported).
+				 */
+				if (ret == 2 &&
+				    managesieve_arg_get_string(&args[1], &sasl_mechs)) {
+					const char *const *mechs = t_strsplit(sasl_mechs, " ");
+
+					if (*mechs != NULL) {
+						/* At least one SASL mechanism is supported */
+						client->proxy_sasl = TRUE;
+					}
+
+				} else {
+					login_proxy_failed(client->common.login_proxy,
+						login_proxy_get_event(client->common.login_proxy),
+						LOGIN_PROXY_FAILURE_TYPE_PROTOCOL,
+						"Server returned erroneous SASL capability");
+					fatal = TRUE;
+				}
+
+			} else if (strcasecmp(capability, "STARTTLS") == 0) {
+				client->proxy_starttls = TRUE;
+			} else if (strcasecmp(capability, "XCLIENT") == 0) {
+				client->proxy_xclient = TRUE;
+			}
+
+		} else {
+			/* Do not accept faulty server */
+			const char *reason = t_strdup_printf(
+				"Remote returned with invalid capability/greeting line: %s",
+				str_sanitize(line,160));
+			login_proxy_failed(client->common.login_proxy,
+				login_proxy_get_event(client->common.login_proxy),
+				LOGIN_PROXY_FAILURE_TYPE_PROTOCOL, reason);
+			fatal = TRUE;
+		}
+
+	} else if (ret == -2) {
+		/* Parser needs more data (not possible on mem stream) */
+		i_unreached();
+
+	} else {
+		const char *error_str =
+			managesieve_parser_get_error(parser, &fatal);
+		error_str = (error_str != NULL ? error_str : "unknown (bug)");
+
+		/* Do not accept faulty server */
+		const char *reason = t_strdup_printf(
+			"Protocol parse error(%d) in capability/greeting line: %s "
+			"(line=`%s')", ret, error_str, line);
+		login_proxy_failed(client->common.login_proxy,
+			login_proxy_get_event(client->common.login_proxy),
+			LOGIN_PROXY_FAILURE_TYPE_PROTOCOL, reason);
+		fatal = TRUE;
+	}
+
+	/* Cleanup parser */
+	managesieve_parser_destroy(&parser);
+	i_stream_destroy(&input);
+
+	/* Time to exit if greeting was not accepted */
+	if (fatal)
+		return -1;
+
+	/* Wait until greeting is received completely */
+	if (*resp_r == MANAGESIEVE_RESPONSE_NONE)
+		return 1;
+
+	return 0;
+}
+
+static void
+managesieve_proxy_parse_auth_reply(const char *line,
+				   const char **reason_r, bool *trylater_r)
+{
+	struct managesieve_parser *parser;
+	const struct managesieve_arg *args;
+	struct istream *input;
+	const char *reason;
+	int ret;
+
+	*trylater_r = FALSE;
+
+	if (strncasecmp(line, "NO ", 3) != 0) {
+		*reason_r = line;
+		return;
+	}
+	line += 3;
+	*reason_r = line;
+
+	if (line[0] == '(') {
+		/* Parse optional resp-code. FIXME: The current
+		   managesieve-parser can't really handle this properly, so
+		   we'll just assume that there aren't any strings with ')'
+		   in them. */
+		if (strncasecmp(line, "(TRYLATER) ", 11) == 0) {
+			*trylater_r = TRUE;
+			line += 11;
+		} else {
+			line = strstr(line, ") ");
+			if (line == NULL)
+				return;
+			line += 2;
+		}
+	}
+
+	/* Parse the string */
+	input = i_stream_create_from_data(line, strlen(line));
+	parser = managesieve_parser_create(input, (size_t)-1);
+	(void)i_stream_read(input);
+	ret = managesieve_parser_finish_line(parser, 0, 0, &args);
+	if (ret == 1 && managesieve_arg_get_string(&args[0], &reason))
+		*reason_r = t_strdup(reason);
+	managesieve_parser_destroy(&parser);
+	i_stream_destroy(&input);
+}
+
+int managesieve_proxy_parse_line(struct client *client, const char *line)
+{
+	struct managesieve_client *msieve_client =
+		(struct managesieve_client *)client;
+	struct ostream *output;
+	enum login_proxy_ssl_flags ssl_flags;
+	managesieve_response_t response = MANAGESIEVE_RESPONSE_NONE;
+	string_t *command;
+	int ret = 0;
+
+	i_assert(!client->destroyed);
+
+	output = login_proxy_get_ostream(client->login_proxy);
+	switch (msieve_client->proxy_state) {
+	case MSIEVE_PROXY_STATE_NONE:
+		ret = proxy_input_capability(msieve_client, line, &response);
+		if (ret < 0)
+			return -1;
+		if (ret == 0) {
+			if (response != MANAGESIEVE_RESPONSE_OK) {
+				login_proxy_failed(client->login_proxy,
+					login_proxy_get_event(client->login_proxy),
+					LOGIN_PROXY_FAILURE_TYPE_PROTOCOL,
+					"Remote sent unexpected NO/BYE instead of capability response");
+				return -1;
+			}
+
+			command = t_str_new(128);
+
+			ssl_flags = login_proxy_get_ssl_flags(client->login_proxy);
+			if ((ssl_flags & PROXY_SSL_FLAG_STARTTLS) != 0) {
+				if (!msieve_client->proxy_starttls) {
+					login_proxy_failed(client->login_proxy,
+						login_proxy_get_event(client->login_proxy),
+						LOGIN_PROXY_FAILURE_TYPE_REMOTE_CONFIG,
+						"Remote doesn't support STARTTLS");
+					return -1;
+				}
+
+				str_append(command, "STARTTLS\r\n");
+				msieve_client->proxy_state = MSIEVE_PROXY_STATE_TLS_START;
+			} else if (msieve_client->proxy_xclient) {
+				proxy_write_xclient(msieve_client, command);
+				msieve_client->proxy_state = MSIEVE_PROXY_STATE_XCLIENT;
+			} else {
+				if (proxy_write_auth(msieve_client, command) < 0)
+					return -1;
+				msieve_client->proxy_state = MSIEVE_PROXY_STATE_AUTH;
+			}
+
+			o_stream_nsend(output, str_data(command), str_len(command));
+		}
+		return 0;
+	case MSIEVE_PROXY_STATE_TLS_START:
+		if (strncasecmp(line, "OK", 2) == 0 &&
+		    (strlen(line) == 2 || line[2] == ' ')) {
+			/* STARTTLS successful, begin TLS negotiation. */
+			if (login_proxy_starttls(client->login_proxy) < 0)
+				return -1;
+
+			msieve_client->proxy_sasl = FALSE;
+			msieve_client->proxy_xclient = FALSE;
+			msieve_client->proxy_state = MSIEVE_PROXY_STATE_TLS_READY;
+			return 1;
+		}
+
+		login_proxy_failed(client->login_proxy,
+			login_proxy_get_event(client->login_proxy),
+			LOGIN_PROXY_FAILURE_TYPE_REMOTE,
+			"Remote refused STARTTLS command");
+		return -1;
+	case MSIEVE_PROXY_STATE_TLS_READY:
+		ret = proxy_input_capability(msieve_client, line, &response);
+		if (ret < 0)
+			return -1;
+		if (ret == 0) {
+			if (response != MANAGESIEVE_RESPONSE_OK) {
+				/* STARTTLS failed */
+				const char *reason = t_strdup_printf(
+					"Remote STARTTLS failed: %s",
+					str_sanitize(line, 160));
+				login_proxy_failed(client->login_proxy,
+					login_proxy_get_event(client->login_proxy),
+					LOGIN_PROXY_FAILURE_TYPE_REMOTE, reason);
+				return -1;
+			}
+
+			command = t_str_new(128);
+			if (msieve_client->proxy_xclient) {
+				proxy_write_xclient(msieve_client, command);
+				msieve_client->proxy_state = MSIEVE_PROXY_STATE_XCLIENT;
+			} else {
+				if (proxy_write_auth(msieve_client, command) < 0)
+					return -1;
+				msieve_client->proxy_state = MSIEVE_PROXY_STATE_AUTH;
+			}
+			o_stream_nsend(output, str_data(command), str_len(command));
+		}
+		return 0;
+	case MSIEVE_PROXY_STATE_XCLIENT:
+		if (strncasecmp(line, "OK", 2) == 0 &&
+		    (strlen(line) == 2 || line[2] == ' ')) {
+			command = t_str_new(128);
+			if (proxy_write_auth(msieve_client, command) < 0)
+				return -1;
+			o_stream_nsend(output, str_data(command), str_len(command));
+			msieve_client->proxy_state = MSIEVE_PROXY_STATE_AUTH;
+			return 0;
+		}
+
+		const char *reason = t_strdup_printf(
+			"Remote XCLIENT failed: %s",
+			str_sanitize(line, 160));
+		login_proxy_failed(client->login_proxy,
+			login_proxy_get_event(client->login_proxy),
+			LOGIN_PROXY_FAILURE_TYPE_REMOTE, reason);
+		return -1;
+	case MSIEVE_PROXY_STATE_AUTH:
+		/* Challenge? */
+		if (*line == '"') {
+			const char *challenge;
+
+			if (proxy_input_auth_challenge(msieve_client, line,
+						       &challenge) < 0)
+				return -1;
+			command = t_str_new(128);
+			if (proxy_write_auth_response(msieve_client, challenge,
+						      command) < 0)
+				return -1;
+			o_stream_nsend(output, str_data(command),
+				       str_len(command));
+			return 0;
+		}
+
+		/* Check login status */
+		if (strncasecmp(line, "OK", 2) == 0 &&
+		    (strlen(line) == 2 || line[2] == ' ')) {
+			string_t *str = t_str_new(128);
+
+			/* Login successful */
+
+			/* FIXME: Some SASL mechanisms cause a capability
+			          response to be sent.
+			 */
+
+			/* Send this line to client. */
+			str_append(str, line);
+			str_append(str, "\r\n");
+			o_stream_nsend(client->output, str_data(str),
+				       str_len(str));
+
+			client_proxy_finish_destroy_client(client);
+			return 1;
+		}
+
+		/* Authentication failed */
+		bool try_later;
+		(void)managesieve_proxy_parse_auth_reply(line, &reason,
+							 &try_later);
+
+		/* Login failed. Send our own failure reply so client can't
+		   figure out if user exists or not just by looking at the reply
+		   string.
+		 */
+		enum login_proxy_failure_type failure_type;
+		if (try_later)
+			failure_type = LOGIN_PROXY_FAILURE_TYPE_AUTH_TEMPFAIL;
+		else {
+			failure_type = LOGIN_PROXY_FAILURE_TYPE_AUTH;
+			client_send_no(client, AUTH_FAILED_MSG);
+		}
+
+		login_proxy_failed(client->login_proxy,
+			login_proxy_get_event(client->login_proxy),
+			failure_type, reason);
+		return -1;
+	default:
+		/* Not supposed to happen */
+		break;
+	}
+
+	i_unreached();
+	return -1;
+}
+
+void managesieve_proxy_reset(struct client *client)
+{
+	struct managesieve_client *msieve_client =
+		(struct managesieve_client *)client;
+
+	msieve_client->proxy_starttls = FALSE;
+	msieve_client->proxy_sasl = FALSE;
+	msieve_client->proxy_xclient = FALSE;
+	msieve_client->proxy_state = MSIEVE_PROXY_STATE_NONE;
+}
+
+static void
+managesieve_proxy_send_failure_reply(struct client *client,
+				     enum login_proxy_failure_type type,
+				     const char *reason)
+{
+	switch (type) {
+	case LOGIN_PROXY_FAILURE_TYPE_CONNECT:
+	case LOGIN_PROXY_FAILURE_TYPE_INTERNAL:
+	case LOGIN_PROXY_FAILURE_TYPE_REMOTE:
+	case LOGIN_PROXY_FAILURE_TYPE_PROTOCOL:
+		client_send_reply_code(client, MANAGESIEVE_CMD_REPLY_NO,
+				       "TRYLATER", LOGIN_PROXY_FAILURE_MSG);
+		break;
+	case LOGIN_PROXY_FAILURE_TYPE_INTERNAL_CONFIG:
+	case LOGIN_PROXY_FAILURE_TYPE_REMOTE_CONFIG:
+		client_send_reply_code(client, MANAGESIEVE_CMD_REPLY_NO,
+				       NULL, LOGIN_PROXY_FAILURE_MSG);
+		break;
+	case LOGIN_PROXY_FAILURE_TYPE_AUTH_TEMPFAIL:
+		client_send_reply_code(client, MANAGESIEVE_CMD_REPLY_NO,
+				       "TRYLATER", reason);
+		break;
+	case LOGIN_PROXY_FAILURE_TYPE_AUTH:
+		/* reply was already sent */
+		break;
+	}
+}
+
+void managesieve_proxy_failed(struct client *client,
+			      enum login_proxy_failure_type type,
+			      const char *reason, bool reconnecting)
+{
+	if (!reconnecting)
+		managesieve_proxy_send_failure_reply(client, type, reason);
+	client_common_proxy_failed(client, type, reason, reconnecting);
+}
+
+const char *managesieve_proxy_get_state(struct client *client)
+{
+	struct managesieve_client *msieve_client =
+		(struct managesieve_client *)client;
+
+	return managesieve_proxy_state_names[msieve_client->proxy_state];
+}
diff --git a/pigeonhole/src/managesieve-login/managesieve-proxy.h b/pigeonhole/src/managesieve-login/managesieve-proxy.h
new file mode 100644
index 0000000..946f074
--- /dev/null
+++ b/pigeonhole/src/managesieve-login/managesieve-proxy.h
@@ -0,0 +1,12 @@
+#ifndef MANAGESIEVE_PROXY_H
+#define MANAGESIEVE_PROXY_H
+
+void managesieve_proxy_reset(struct client *client);
+int managesieve_proxy_parse_line(struct client *client, const char *line);
+
+void managesieve_proxy_failed(struct client *client,
+			      enum login_proxy_failure_type type,
+			      const char *reason, bool reconnecting);
+const char *managesieve_proxy_get_state(struct client *client);
+
+#endif
diff --git a/pigeonhole/src/managesieve/Makefile.am b/pigeonhole/src/managesieve/Makefile.am
new file mode 100644
index 0000000..17b5790
--- /dev/null
+++ b/pigeonhole/src/managesieve/Makefile.am
@@ -0,0 +1,59 @@
+settingsdir = $(dovecot_moduledir)/settings
+
+dovecot_pkglibexec_PROGRAMS = managesieve
+
+AM_CPPFLAGS = \
+	$(LIBDOVECOT_INCLUDE) \
+	$(LIBDOVECOT_SERVICE_INCLUDE) \
+	-DMODULEDIR=\""$(dovecot_moduledir)"\" \
+	-I$(top_srcdir) \
+	-I$(top_srcdir)/src/lib-sieve \
+	-I$(top_srcdir)/src/lib-managesieve
+
+libmanagesieve_settings_la_LDFLAGS = -module -avoid-version
+
+settings_LTLIBRARIES = \
+	libmanagesieve_settings.la
+
+libmanagesieve_settings_la_SOURCES = \
+	managesieve-settings.c
+
+libs = \
+	managesieve-settings.lo \
+	$(top_builddir)/src/lib-managesieve/libmanagesieve.la \
+	$(top_builddir)/src/lib-sieve/libdovecot-sieve.la
+
+managesieve_CPPFLAGS = $(AM_CPPFLAGS) $(BINARY_CFLAGS)
+managesieve_LDFLAGS = -export-dynamic $(BINARY_LDFLAGS)
+
+managesieve_LDADD = $(libs) $(LIBDOVECOT_STORAGE) $(LIBDOVECOT_LDA) $(LIBDOVECOT)
+
+managesieve_DEPENDENCIES = $(libs) $(LIBDOVECOT_STORAGE_DEPS) $(LIBDOVECOT_LDA_DEPS) $(LIBDOVECOT_DEPS)
+
+cmds = \
+	cmd-capability.c \
+	cmd-logout.c \
+	cmd-putscript.c \
+	cmd-getscript.c \
+	cmd-setactive.c \
+	cmd-deletescript.c \
+	cmd-listscripts.c \
+	cmd-havespace.c \
+	cmd-renamescript.c \
+	cmd-noop.c
+
+managesieve_SOURCES = \
+	$(cmds) \
+	managesieve-quota.c \
+	managesieve-client.c \
+	managesieve-commands.c \
+	managesieve-capabilities.c \
+	main.c
+
+noinst_HEADERS = \
+	managesieve-quota.h \
+	managesieve-client.h \
+	managesieve-commands.h \
+	managesieve-capabilities.h \
+	managesieve-settings.h \
+	managesieve-common.h
diff --git a/pigeonhole/src/managesieve/Makefile.in b/pigeonhole/src/managesieve/Makefile.in
new file mode 100644
index 0000000..d8f9faa
--- /dev/null
+++ b/pigeonhole/src/managesieve/Makefile.in
@@ -0,0 +1,1134 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+
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+  if test -z '$(MAKELEVEL)'; then \
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+	managesieve-cmd-setactive.$(OBJEXT) \
+	managesieve-cmd-deletescript.$(OBJEXT) \
+	managesieve-cmd-listscripts.$(OBJEXT) \
+	managesieve-cmd-havespace.$(OBJEXT) \
+	managesieve-cmd-renamescript.$(OBJEXT) \
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+	managesieve-managesieve-quota.$(OBJEXT) \
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+	managesieve-main.$(OBJEXT)
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+	$(LIBTOOLFLAGS) --mode=link $(CCLD) $(AM_CFLAGS) $(CFLAGS) \
+	$(managesieve_LDFLAGS) $(LDFLAGS) -o $@
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+	./$(DEPDIR)/managesieve-cmd-havespace.Po \
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+	$(LIBDOVECOT_SERVICE_INCLUDE) \
+	-DMODULEDIR=\""$(dovecot_moduledir)"\" \
+	-I$(top_srcdir) \
+	-I$(top_srcdir)/src/lib-sieve \
+	-I$(top_srcdir)/src/lib-managesieve
+
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+settings_LTLIBRARIES = \
+	libmanagesieve_settings.la
+
+libmanagesieve_settings_la_SOURCES = \
+	managesieve-settings.c
+
+libs = \
+	managesieve-settings.lo \
+	$(top_builddir)/src/lib-managesieve/libmanagesieve.la \
+	$(top_builddir)/src/lib-sieve/libdovecot-sieve.la
+
+managesieve_CPPFLAGS = $(AM_CPPFLAGS) $(BINARY_CFLAGS)
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+managesieve_DEPENDENCIES = $(libs) $(LIBDOVECOT_STORAGE_DEPS) $(LIBDOVECOT_LDA_DEPS) $(LIBDOVECOT_DEPS)
+cmds = \
+	cmd-capability.c \
+	cmd-logout.c \
+	cmd-putscript.c \
+	cmd-getscript.c \
+	cmd-setactive.c \
+	cmd-deletescript.c \
+	cmd-listscripts.c \
+	cmd-havespace.c \
+	cmd-renamescript.c \
+	cmd-noop.c
+
+managesieve_SOURCES = \
+	$(cmds) \
+	managesieve-quota.c \
+	managesieve-client.c \
+	managesieve-commands.c \
+	managesieve-capabilities.c \
+	main.c
+
+noinst_HEADERS = \
+	managesieve-quota.h \
+	managesieve-client.h \
+	managesieve-commands.h \
+	managesieve-capabilities.h \
+	managesieve-settings.h \
+	managesieve-common.h
+
+all: all-am
+
+.SUFFIXES:
+.SUFFIXES: .c .lo .o .obj
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/managesieve/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/managesieve/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
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+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
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+	@$(NORMAL_INSTALL)
+	@list='$(dovecot_pkglibexec_PROGRAMS)'; test -n "$(dovecot_pkglibexecdir)" || list=; \
+	if test -n "$$list"; then \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(dovecot_pkglibexecdir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(dovecot_pkglibexecdir)" || exit 1; \
+	fi; \
+	for p in $$list; do echo "$$p $$p"; done | \
+	sed 's/$(EXEEXT)$$//' | \
+	while read p p1; do if test -f $$p \
+	 || test -f $$p1 \
+	  ; then echo "$$p"; echo "$$p"; else :; fi; \
+	done | \
+	sed -e 'p;s,.*/,,;n;h' \
+	    -e 's|.*|.|' \
+	    -e 'p;x;s,.*/,,;s/$(EXEEXT)$$//;$(transform);s/$$/$(EXEEXT)/' | \
+	sed 'N;N;N;s,\n, ,g' | \
+	$(AWK) 'BEGIN { files["."] = ""; dirs["."] = 1 } \
+	  { d=$$3; if (dirs[d] != 1) { print "d", d; dirs[d] = 1 } \
+	    if ($$2 == $$4) files[d] = files[d] " " $$1; \
+	    else { print "f", $$3 "/" $$4, $$1; } } \
+	  END { for (d in files) print "f", d, files[d] }' | \
+	while read type dir files; do \
+	    if test "$$dir" = .; then dir=; else dir=/$$dir; fi; \
+	    test -z "$$files" || { \
+	    echo " $(INSTALL_PROGRAM_ENV) $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL_PROGRAM) $$files '$(DESTDIR)$(dovecot_pkglibexecdir)$$dir'"; \
+	    $(INSTALL_PROGRAM_ENV) $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL_PROGRAM) $$files "$(DESTDIR)$(dovecot_pkglibexecdir)$$dir" || exit $$?; \
+	    } \
+	; done
+
+uninstall-dovecot_pkglibexecPROGRAMS:
+	@$(NORMAL_UNINSTALL)
+	@list='$(dovecot_pkglibexec_PROGRAMS)'; test -n "$(dovecot_pkglibexecdir)" || list=; \
+	files=`for p in $$list; do echo "$$p"; done | \
+	  sed -e 'h;s,^.*/,,;s/$(EXEEXT)$$//;$(transform)' \
+	      -e 's/$$/$(EXEEXT)/' \
+	`; \
+	test -n "$$list" || exit 0; \
+	echo " ( cd '$(DESTDIR)$(dovecot_pkglibexecdir)' && rm -f" $$files ")"; \
+	cd "$(DESTDIR)$(dovecot_pkglibexecdir)" && rm -f $$files
+
+clean-dovecot_pkglibexecPROGRAMS:
+	@list='$(dovecot_pkglibexec_PROGRAMS)'; test -n "$$list" || exit 0; \
+	echo " rm -f" $$list; \
+	rm -f $$list || exit $$?; \
+	test -n "$(EXEEXT)" || exit 0; \
+	list=`for p in $$list; do echo "$$p"; done | sed 's/$(EXEEXT)$$//'`; \
+	echo " rm -f" $$list; \
+	rm -f $$list
+
+install-settingsLTLIBRARIES: $(settings_LTLIBRARIES)
+	@$(NORMAL_INSTALL)
+	@list='$(settings_LTLIBRARIES)'; test -n "$(settingsdir)" || list=; \
+	list2=; for p in $$list; do \
+	  if test -f $$p; then \
+	    list2="$$list2 $$p"; \
+	  else :; fi; \
+	done; \
+	test -z "$$list2" || { \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(settingsdir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(settingsdir)" || exit 1; \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL) $(INSTALL_STRIP_FLAG) $$list2 '$(DESTDIR)$(settingsdir)'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL) $(INSTALL_STRIP_FLAG) $$list2 "$(DESTDIR)$(settingsdir)"; \
+	}
+
+uninstall-settingsLTLIBRARIES:
+	@$(NORMAL_UNINSTALL)
+	@list='$(settings_LTLIBRARIES)'; test -n "$(settingsdir)" || list=; \
+	for p in $$list; do \
+	  $(am__strip_dir) \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f '$(DESTDIR)$(settingsdir)/$$f'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f "$(DESTDIR)$(settingsdir)/$$f"; \
+	done
+
+clean-settingsLTLIBRARIES:
+	-test -z "$(settings_LTLIBRARIES)" || rm -f $(settings_LTLIBRARIES)
+	@list='$(settings_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+libmanagesieve_settings.la: $(libmanagesieve_settings_la_OBJECTS) $(libmanagesieve_settings_la_DEPENDENCIES) $(EXTRA_libmanagesieve_settings_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(libmanagesieve_settings_la_LINK) -rpath $(settingsdir) $(libmanagesieve_settings_la_OBJECTS) $(libmanagesieve_settings_la_LIBADD) $(LIBS)
+
+managesieve$(EXEEXT): $(managesieve_OBJECTS) $(managesieve_DEPENDENCIES) $(EXTRA_managesieve_DEPENDENCIES) 
+	@rm -f managesieve$(EXEEXT)
+	$(AM_V_CCLD)$(managesieve_LINK) $(managesieve_OBJECTS) $(managesieve_LDADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/managesieve-cmd-capability.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/managesieve-cmd-deletescript.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/managesieve-cmd-getscript.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/managesieve-cmd-havespace.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/managesieve-cmd-listscripts.Po@am__quote@ # am--include-marker
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+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/managesieve-cmd-noop.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/managesieve-cmd-putscript.Po@am__quote@ # am--include-marker
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+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/managesieve-main.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/managesieve-managesieve-capabilities.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/managesieve-managesieve-client.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/managesieve-managesieve-commands.Po@am__quote@ # am--include-marker
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+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/managesieve-settings.Plo@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
+am--depfiles: $(am__depfiles_remade)
+
+.c.o:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
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+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
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+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(COMPILE) -c -o $@ $<
+
+.c.obj:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ `$(CYGPATH_W) '$<'`
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+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
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+.c.lo:
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+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=yes @AMDEPBACKSLASH@
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+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LTCOMPILE) -c -o $@ $<
+
+managesieve-cmd-capability.o: cmd-capability.c
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+		-rm -f ./$(DEPDIR)/managesieve-cmd-capability.Po
+	-rm -f ./$(DEPDIR)/managesieve-cmd-deletescript.Po
+	-rm -f ./$(DEPDIR)/managesieve-cmd-getscript.Po
+	-rm -f ./$(DEPDIR)/managesieve-cmd-havespace.Po
+	-rm -f ./$(DEPDIR)/managesieve-cmd-listscripts.Po
+	-rm -f ./$(DEPDIR)/managesieve-cmd-logout.Po
+	-rm -f ./$(DEPDIR)/managesieve-cmd-noop.Po
+	-rm -f ./$(DEPDIR)/managesieve-cmd-putscript.Po
+	-rm -f ./$(DEPDIR)/managesieve-cmd-renamescript.Po
+	-rm -f ./$(DEPDIR)/managesieve-cmd-setactive.Po
+	-rm -f ./$(DEPDIR)/managesieve-main.Po
+	-rm -f ./$(DEPDIR)/managesieve-managesieve-capabilities.Po
+	-rm -f ./$(DEPDIR)/managesieve-managesieve-client.Po
+	-rm -f ./$(DEPDIR)/managesieve-managesieve-commands.Po
+	-rm -f ./$(DEPDIR)/managesieve-managesieve-quota.Po
+	-rm -f ./$(DEPDIR)/managesieve-settings.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-dovecot_pkglibexecPROGRAMS \
+	uninstall-settingsLTLIBRARIES
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-dovecot_pkglibexecPROGRAMS clean-generic clean-libtool \
+	clean-settingsLTLIBRARIES cscopelist-am ctags ctags-am \
+	distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dovecot_pkglibexecPROGRAMS install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-settingsLTLIBRARIES install-strip installcheck \
+	installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am \
+	uninstall-dovecot_pkglibexecPROGRAMS \
+	uninstall-settingsLTLIBRARIES
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/managesieve/cmd-capability.c b/pigeonhole/src/managesieve/cmd-capability.c
new file mode 100644
index 0000000..1d26eb5
--- /dev/null
+++ b/pigeonhole/src/managesieve/cmd-capability.c
@@ -0,0 +1,76 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "strfuncs.h"
+#include "ostream.h"
+
+#include "sieve.h"
+
+#include "managesieve-common.h"
+#include "managesieve-commands.h"
+
+static void send_capability(struct client_command_context *cmd)
+{
+	struct client *client = cmd->client;
+	const char *sievecap, *notifycap;
+	unsigned int max_redirects;
+
+	/* Get capabilities */
+	sievecap = sieve_get_capabilities(client->svinst, NULL);
+	notifycap = sieve_get_capabilities(client->svinst, "notify");
+	max_redirects = sieve_max_redirects(client->svinst);
+
+	/* Default capabilities */
+	client_send_line(client,
+		t_strconcat(
+			"\"IMPLEMENTATION\" \"",
+			client->set->managesieve_implementation_string,
+			"\"", NULL));
+	client_send_line(client,
+		t_strconcat(
+			"\"SIEVE\" \"",
+			(sievecap == NULL ? "" : sievecap),
+			"\"", NULL));
+
+	/* Maximum number of redirects (if limited) */
+	if (max_redirects > 0) {
+		client_send_line(client,
+			t_strdup_printf("\"MAXREDIRECTS\" \"%u\"",
+					max_redirects));
+	}
+
+	/* Notify methods */
+	if (notifycap != NULL) {
+		client_send_line(client,
+			t_strconcat("\"NOTIFY\" \"", notifycap, "\"",
+				    NULL));
+	}
+
+	/* Protocol version */
+	client_send_line(client, "\"VERSION\" \"1.0\"");
+}
+
+bool cmd_capability(struct client_command_context *cmd)
+{
+	struct client *client = cmd->client;
+
+	/* no arguments */
+	if (!client_read_no_args(cmd))
+		return FALSE;
+
+	o_stream_cork(client->output);
+
+	T_BEGIN {
+		send_capability(cmd);
+	} T_END;
+
+	client_send_line(client, "OK \"Capability completed.\"");
+
+	o_stream_uncork(client->output);
+
+	return TRUE;
+
+}
+
diff --git a/pigeonhole/src/managesieve/cmd-deletescript.c b/pigeonhole/src/managesieve/cmd-deletescript.c
new file mode 100644
index 0000000..a8be5c9
--- /dev/null
+++ b/pigeonhole/src/managesieve/cmd-deletescript.c
@@ -0,0 +1,43 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+
+#include "sieve.h"
+#include "sieve-script.h"
+#include "sieve-storage.h"
+
+#include "managesieve-common.h"
+#include "managesieve-commands.h"
+
+bool cmd_deletescript(struct client_command_context *cmd)
+{
+	struct client *client = cmd->client;
+	struct sieve_storage *storage = client->storage;
+	const char *scriptname;
+	struct sieve_script *script;
+
+	/* <script name>*/
+	if (!client_read_string_args(cmd, TRUE, 1, &scriptname))
+		return FALSE;
+
+	event_add_str(cmd->event, "script_name", scriptname);
+
+	script = sieve_storage_open_script(storage, scriptname, NULL);
+	if (script == NULL || sieve_script_delete(script, FALSE) < 0) {
+		client_command_storage_error(
+			cmd, "Failed to delete script `%s'", scriptname);
+		sieve_script_unref(&script);
+		return TRUE;
+	}
+
+	struct event_passthrough *e =
+		client_command_create_finish_event(cmd);
+	e_debug(e->event(), "Deleted script `%s'", scriptname);
+
+	client->deleted_count++;
+	client_send_ok(client, "Deletescript completed.");
+
+	sieve_script_unref(&script);
+	return TRUE;
+}
diff --git a/pigeonhole/src/managesieve/cmd-getscript.c b/pigeonhole/src/managesieve/cmd-getscript.c
new file mode 100644
index 0000000..2f0a5f9
--- /dev/null
+++ b/pigeonhole/src/managesieve/cmd-getscript.c
@@ -0,0 +1,157 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "ostream.h"
+#include "istream.h"
+#include "iostream.h"
+
+#include "sieve-script.h"
+#include "sieve-storage.h"
+
+#include "managesieve-common.h"
+#include "managesieve-commands.h"
+
+struct cmd_getscript_context {
+	struct client *client;
+	struct client_command_context *cmd;
+	struct sieve_storage *storage;
+	uoff_t script_size;
+
+	const char *scriptname;
+	struct sieve_script *script;
+	struct istream *script_stream;
+
+	bool failed:1;
+};
+
+static bool cmd_getscript_finish(struct cmd_getscript_context *ctx)
+{
+	struct client_command_context *cmd = ctx->cmd;
+	struct client *client = ctx->client;
+
+	if (ctx->script != NULL)
+		sieve_script_unref(&ctx->script);
+
+	if (ctx->failed) {
+		if (client->output->closed) {
+			client_disconnect(client, NULL);
+			return TRUE;
+		}
+
+		client_command_storage_error(
+			cmd, "Failed to retrieve script `%s'", ctx->scriptname);
+		return TRUE;
+	}
+
+	client->get_count++;
+	client->get_bytes += ctx->script_size;
+
+	struct event_passthrough *e =
+		client_command_create_finish_event(cmd);
+	e_debug(e->event(), "Retrieved script `%s'", ctx->scriptname);
+
+	client_send_line(client, "");
+	client_send_ok(client, "Getscript completed.");
+	return TRUE;
+}
+
+static bool cmd_getscript_continue(struct client_command_context *cmd)
+{
+	struct client *client = cmd->client;
+	struct cmd_getscript_context *ctx = cmd->context;
+
+	switch (o_stream_send_istream(client->output, ctx->script_stream)) {
+	case OSTREAM_SEND_ISTREAM_RESULT_FINISHED:
+		if (ctx->script_stream->v_offset != ctx->script_size &&
+		    !ctx->failed) {
+			/* Input stream gave less data than expected */
+			sieve_storage_set_critical(
+				ctx->storage, "GETSCRIPT for script `%s' "
+				"from %s got too little data: "
+				"%"PRIuUOFF_T" vs %"PRIuUOFF_T,
+				sieve_script_name(ctx->script),
+				sieve_script_location(ctx->script),
+				ctx->script_stream->v_offset, ctx->script_size);
+			client_disconnect(ctx->client, "GETSCRIPT failed");
+			ctx->failed = TRUE;
+		}
+		break;
+	case OSTREAM_SEND_ISTREAM_RESULT_WAIT_INPUT:
+		i_unreached();
+	case OSTREAM_SEND_ISTREAM_RESULT_WAIT_OUTPUT:
+		return FALSE;
+	case OSTREAM_SEND_ISTREAM_RESULT_ERROR_INPUT:
+		sieve_storage_set_critical(ctx->storage,
+			"o_stream_send_istream() failed for script `%s' "
+			"from %s: %s",
+			sieve_script_name(ctx->script),
+			sieve_script_location(ctx->script),
+			i_stream_get_error(ctx->script_stream));
+		ctx->failed = TRUE;
+		break;
+	case OSTREAM_SEND_ISTREAM_RESULT_ERROR_OUTPUT:
+		client_disconnect(ctx->client, NULL);
+		ctx->failed = TRUE;
+		break;
+	}
+	return cmd_getscript_finish(ctx);
+}
+
+bool cmd_getscript(struct client_command_context *cmd)
+{
+	struct client *client = cmd->client;
+	struct cmd_getscript_context *ctx;
+	const char *scriptname;
+	enum sieve_error error;
+
+	/* <scriptname> */
+	if (!client_read_string_args(cmd, TRUE, 1, &scriptname))
+		return FALSE;
+
+	event_add_str(cmd->event, "script_name", scriptname);
+
+	ctx = p_new(cmd->pool, struct cmd_getscript_context, 1);
+	ctx->cmd = cmd;
+	ctx->client = client;
+	ctx->scriptname = p_strdup(cmd->pool, scriptname);
+	ctx->storage = client->storage;
+	ctx->failed = FALSE;
+
+	ctx->script = sieve_storage_open_script(client->storage, scriptname,
+						NULL);
+	if (ctx->script == NULL) {
+		ctx->failed = TRUE;
+		return cmd_getscript_finish(ctx);
+	}
+
+	if (sieve_script_get_stream(ctx->script, &ctx->script_stream,
+				    &error) < 0 ) {
+		if (error == SIEVE_ERROR_NOT_FOUND) {
+			sieve_storage_set_error(client->storage, error,
+						"Script does not exist.");
+		}
+		ctx->failed = TRUE;
+		return cmd_getscript_finish(ctx);
+	}
+
+	if (sieve_script_get_size(ctx->script, &ctx->script_size) <= 0) {
+		sieve_storage_set_critical(ctx->storage,
+			"failed to obtain script size for script `%s' from %s",
+			sieve_script_name(ctx->script),
+			sieve_script_location(ctx->script));
+		ctx->failed = TRUE;
+		return cmd_getscript_finish(ctx);
+	}
+
+	i_assert(ctx->script_stream->v_offset == 0);
+
+	client_send_line(client, t_strdup_printf("{%"PRIuUOFF_T"}",
+						 ctx->script_size));
+
+	client->command_pending = TRUE;
+	cmd->func = cmd_getscript_continue;
+	cmd->context = ctx;
+
+	return cmd_getscript_continue(cmd);
+}
diff --git a/pigeonhole/src/managesieve/cmd-havespace.c b/pigeonhole/src/managesieve/cmd-havespace.c
new file mode 100644
index 0000000..5af2bb1
--- /dev/null
+++ b/pigeonhole/src/managesieve/cmd-havespace.c
@@ -0,0 +1,60 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+
+#include "managesieve-common.h"
+#include "managesieve-commands.h"
+
+#include "sieve.h"
+#include "sieve-script.h"
+#include "sieve-storage.h"
+
+#include "managesieve-client.h"
+#include "managesieve-quota.h"
+
+bool cmd_havespace(struct client_command_context *cmd)
+{
+	struct client *client = cmd->client;
+	const struct managesieve_arg *args;
+	const char *scriptname;
+	uoff_t size;
+
+	/* <scriptname> <size> */
+	if (!client_read_args(cmd, 2, 0, TRUE, &args))
+		return FALSE;
+
+	if (!managesieve_arg_get_string(&args[0], &scriptname)) {
+		client_send_no(client, "Invalid string for scriptname.");
+		return TRUE;
+	}
+
+	if (!managesieve_arg_get_number(&args[1], &size)) {
+		client_send_no(client, "Invalid scriptsize argument.");
+		return TRUE;
+	}
+
+	if (!sieve_script_name_is_valid(scriptname)) {
+		client_send_no(client, "Invalid script name.");
+		return TRUE;
+	}
+
+	if (size == 0) {
+		client_send_no(client, "Cannot upload empty script.");
+		return TRUE;
+	}
+
+	event_add_str(cmd->event, "script_name", scriptname);
+	event_add_int(cmd->event, "script_size", size);
+
+	if (!managesieve_quota_check_all(cmd, scriptname, size))
+		return TRUE;
+
+	struct event_passthrough *e =
+		client_command_create_finish_event(cmd);
+	e_debug(e->event(), "Quota is within limits for script `%s' "
+		"with size %"PRIuUOFF_T, scriptname, size);
+
+	client_send_ok(client, "Putscript would succeed.");
+	return TRUE;
+}
diff --git a/pigeonhole/src/managesieve/cmd-listscripts.c b/pigeonhole/src/managesieve/cmd-listscripts.c
new file mode 100644
index 0000000..9e6abd2
--- /dev/null
+++ b/pigeonhole/src/managesieve/cmd-listscripts.c
@@ -0,0 +1,65 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+
+#include "sieve.h"
+#include "sieve-storage.h"
+
+#include "managesieve-quote.h"
+
+#include "managesieve-common.h"
+#include "managesieve-commands.h"
+
+bool cmd_listscripts(struct client_command_context *cmd)
+{
+	struct client *client = cmd->client;
+	struct sieve_storage_list_context *ctx;
+	const char *scriptname;
+	unsigned int script_count = 0;
+	bool active;
+	string_t *str;
+
+	/* no arguments */
+	if (!client_read_no_args(cmd))
+		return FALSE;
+
+	if ((ctx = sieve_storage_list_init(client->storage)) == NULL) {
+		client_command_storage_error(
+			cmd, "Failed to list scripts");
+		return TRUE;
+	}
+
+	/* FIXME: This will be quite slow for large script lists. Implement
+	 * some buffering to fix this. Wont truely be an issue with managesieve
+	 * though.
+	 */
+	while ((scriptname = sieve_storage_list_next(ctx, &active)) != NULL) {
+		T_BEGIN {
+			str = t_str_new(128);
+
+			managesieve_quote_append_string(str, scriptname, FALSE);
+
+			if (active)
+				str_append(str, " ACTIVE");
+
+			client_send_line(client, str_c(str));
+		} T_END;
+
+		script_count++;
+	}
+
+	if (sieve_storage_list_deinit(&ctx) < 0) {
+		client_command_storage_error(
+			cmd, "Failed to list scripts");
+		return TRUE;
+	}
+
+	struct event_passthrough *e =
+		client_command_create_finish_event(cmd);
+	e_debug(e->event(), "Listed %u scripts", script_count);
+
+	client_send_ok(client, "Listscripts completed.");
+	return TRUE;
+}
diff --git a/pigeonhole/src/managesieve/cmd-logout.c b/pigeonhole/src/managesieve/cmd-logout.c
new file mode 100644
index 0000000..9e0847d
--- /dev/null
+++ b/pigeonhole/src/managesieve/cmd-logout.c
@@ -0,0 +1,21 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "ostream.h"
+
+#include "managesieve-common.h"
+#include "managesieve-commands.h"
+
+bool cmd_logout(struct client_command_context *cmd)
+{
+	struct client *client = cmd->client;
+
+	/* no arguments */
+	if (!client_read_no_args(cmd))
+		return FALSE;
+
+	client_send_line(client, "OK \"Logout completed.\"");
+	client_disconnect(client, "Logged out");
+	return TRUE;
+}
diff --git a/pigeonhole/src/managesieve/cmd-noop.c b/pigeonhole/src/managesieve/cmd-noop.c
new file mode 100644
index 0000000..76d96c3
--- /dev/null
+++ b/pigeonhole/src/managesieve/cmd-noop.c
@@ -0,0 +1,46 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+
+#include "managesieve-quote.h"
+
+#include "managesieve-common.h"
+#include "managesieve-commands.h"
+
+
+bool cmd_noop(struct client_command_context *cmd)
+{
+	struct client *client = cmd->client;
+	const struct managesieve_arg *args;
+	const char *text;
+	string_t *resp_code;
+
+	/* [<echo string>] */
+	if (!client_read_args(cmd, 0, 0, FALSE, &args))
+		return FALSE;
+
+	if (MANAGESIEVE_ARG_IS_EOL(&args[0])) {
+		client_send_ok(client, "NOOP Completed");
+		return TRUE;
+	}
+
+	if (!managesieve_arg_get_string(&args[0], &text)) {
+		client_send_no(client, "Invalid echo tag.");
+		return TRUE;
+	}
+
+	if (!MANAGESIEVE_ARG_IS_EOL(&args[1])) {
+		client_send_command_error(cmd, "Too many arguments.");
+		return TRUE;
+	}
+
+	resp_code = t_str_new(256);
+	str_append(resp_code, "TAG ");
+	managesieve_quote_append_string(resp_code, text, FALSE);
+
+	client_send_okresp(client, str_c(resp_code), "Done");
+	return TRUE;
+}
+
diff --git a/pigeonhole/src/managesieve/cmd-putscript.c b/pigeonhole/src/managesieve/cmd-putscript.c
new file mode 100644
index 0000000..1998cd9
--- /dev/null
+++ b/pigeonhole/src/managesieve/cmd-putscript.c
@@ -0,0 +1,578 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* NOTE: this file also contains the checkscript command due to its obvious
+ * similarities.
+ */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "istream.h"
+#include "ostream.h"
+#include "iostream.h"
+#include "str.h"
+
+#include "sieve.h"
+#include "sieve-script.h"
+#include "sieve-storage.h"
+
+#include "managesieve-parser.h"
+
+#include "managesieve-common.h"
+#include "managesieve-client.h"
+#include "managesieve-commands.h"
+#include "managesieve-quota.h"
+
+#include <sys/time.h>
+
+struct cmd_putscript_context {
+	struct client *client;
+	struct client_command_context *cmd;
+	struct sieve_storage *storage;
+
+	struct istream *input;
+
+	const char *scriptname;
+	uoff_t script_size, max_script_size;
+
+	struct managesieve_parser *save_parser;
+	struct sieve_storage_save_context *save_ctx;
+
+	bool script_size_valid:1;
+};
+
+static void cmd_putscript_finish(struct cmd_putscript_context *ctx);
+static bool cmd_putscript_continue_script(struct client_command_context *cmd);
+
+static void client_input_putscript(struct client *client)
+{
+	struct client_command_context *cmd = &client->cmd;
+
+	i_assert(!client->destroyed);
+
+	client->last_input = ioloop_time;
+	timeout_reset(client->to_idle);
+
+	switch (i_stream_read(client->input)) {
+	case -1:
+		/* disconnected */
+		cmd_putscript_finish(cmd->context);
+		/* Reset command so that client_destroy() doesn't try to call
+		   cmd_putscript_continue_script() anymore. */
+		_client_reset_command(client);
+		client_destroy(client, "Disconnected in PUTSCRIPT/CHECKSCRIPT");
+		return;
+	case -2:
+		cmd_putscript_finish(cmd->context);
+		if (client->command_pending) {
+			/* uploaded script data, this is handled internally by
+			   mailbox_save_continue() */
+			break;
+		}
+
+		/* parameter word is longer than max. input buffer size.
+		   this is most likely an error, so skip the new data
+		   until newline is found. */
+		client->input_skip_line = TRUE;
+
+		client_send_command_error(cmd, "Too long argument.");
+		cmd->param_error = TRUE;
+		_client_reset_command(client);
+		return;
+	}
+
+	if (cmd->func(cmd)) {
+		/* command execution was finished. Note that if cmd_sync()
+		   didn't finish, we didn't get here but the input handler
+		   has already been moved. So don't do anything important
+		   here..
+
+		   reset command once again to reset cmd_sync()'s changes. */
+		_client_reset_command(client);
+
+		if (client->input_pending)
+			client_input(client);
+	}
+}
+
+static void cmd_putscript_finish(struct cmd_putscript_context *ctx)
+{
+	managesieve_parser_destroy(&ctx->save_parser);
+
+	io_remove(&ctx->client->io);
+	o_stream_set_flush_callback(ctx->client->output,
+				    client_output, ctx->client);
+
+	if (ctx->save_ctx != NULL) {
+		ctx->client->input_skip_line = TRUE;
+		sieve_storage_save_cancel(&ctx->save_ctx);
+	}
+}
+
+static bool cmd_putscript_continue_cancel(struct client_command_context *cmd)
+{
+	struct cmd_putscript_context *ctx = cmd->context;
+	size_t size;
+
+	(void)i_stream_read(ctx->input);
+	(void)i_stream_get_data(ctx->input, &size);
+	i_stream_skip(ctx->input, size);
+
+	if (cmd->client->input->closed || ctx->input->eof ||
+	    ctx->input->v_offset == ctx->script_size) {
+		cmd_putscript_finish(ctx);
+		return TRUE;
+	}
+	return FALSE;
+}
+
+static bool cmd_putscript_cancel(struct cmd_putscript_context *ctx, bool skip)
+{
+	ctx->client->input_skip_line = TRUE;
+
+	if (!skip) {
+		cmd_putscript_finish(ctx);
+		return TRUE;
+	}
+
+	/* we have to read the nonsynced literal so we don't treat the uploaded
+	   script as commands. */
+	ctx->client->command_pending = TRUE;
+	ctx->cmd->func = cmd_putscript_continue_cancel;
+	ctx->cmd->context = ctx;
+	return cmd_putscript_continue_cancel(ctx->cmd);
+}
+
+static void cmd_putscript_storage_error(struct cmd_putscript_context *ctx)
+{
+	struct client_command_context *cmd = ctx->cmd;
+
+	if (ctx->scriptname == NULL) {
+		client_command_storage_error(cmd, "Failed to check script");
+	} else {
+		client_command_storage_error(cmd, "Failed to store script `%s'",
+					     ctx->scriptname);
+	}
+}
+
+static bool cmd_putscript_save(struct cmd_putscript_context *ctx)
+{
+	/* Commit to save only when this is a putscript command */
+	if (ctx->scriptname == NULL)
+		return TRUE;
+
+	/* Check commit */
+	if (sieve_storage_save_commit(&ctx->save_ctx) < 0) {
+		cmd_putscript_storage_error(ctx);
+		return FALSE;
+	}
+	return TRUE;
+}
+
+static void
+cmd_putscript_finish_script(struct cmd_putscript_context *ctx,
+			    struct sieve_script *script)
+{
+	struct client *client = ctx->client;
+	struct client_command_context *cmd = ctx->cmd;
+	struct sieve_error_handler *ehandler;
+	enum sieve_compile_flags cpflags =
+		SIEVE_COMPILE_FLAG_NOGLOBAL | SIEVE_COMPILE_FLAG_UPLOADED;
+	struct sieve_binary *sbin;
+	bool success = TRUE;
+	enum sieve_error error;
+	string_t *errors;
+
+	/* Mark this as an activation when we are replacing the
+	   active script */
+	if (sieve_storage_save_will_activate(ctx->save_ctx))
+		cpflags |= SIEVE_COMPILE_FLAG_ACTIVATED;
+
+	/* Prepare error handler */
+	errors = str_new(default_pool, 1024);
+	ehandler = sieve_strbuf_ehandler_create(
+		client->svinst, errors, TRUE,
+		client->set->managesieve_max_compile_errors);
+
+	/* Compile */
+	sbin = sieve_compile_script(script, ehandler, cpflags, &error);
+	if (sbin == NULL) {
+		const char *errormsg = NULL, *action;
+
+		if (error != SIEVE_ERROR_NOT_VALID) {
+			errormsg = sieve_script_get_last_error(script, &error);
+			if (error == SIEVE_ERROR_NONE)
+				errormsg = NULL;
+		}
+
+		action = (ctx->scriptname != NULL ?
+			  t_strdup_printf("store script `%s'",
+					  ctx->scriptname) :
+			  "check script");
+
+		if (errormsg == NULL) {
+			struct event_passthrough *e =
+				client_command_create_finish_event(cmd)->
+				add_str("error", "Compilation failed")->
+				add_int("compile_errors",
+					sieve_get_errors(ehandler))->
+				add_int("compile_warnings",
+					sieve_get_warnings(ehandler));
+			e_debug(e->event(), "Failed to %s: "
+				"Compilation failed (%u errors, %u warnings)",
+				action, sieve_get_errors(ehandler),
+				sieve_get_warnings(ehandler));
+
+			client_send_no(client, str_c(errors));
+		} else {
+			struct event_passthrough *e =
+				client_command_create_finish_event(cmd)->
+				add_str("error", errormsg);
+			e_debug(e->event(), "Failed to %s: %s",
+				action, errormsg);
+
+			client_send_no(client, errormsg);
+		}
+
+		success = FALSE;
+	} else {
+		sieve_close(&sbin);
+
+		if (!cmd_putscript_save(ctx))
+			success = FALSE;
+	}
+
+	/* Finish up */
+	cmd_putscript_finish(ctx);
+
+	/* Report result to user */
+	if (success) {
+		if (ctx->scriptname != NULL) {
+			client->put_count++;
+			client->put_bytes += ctx->script_size;
+		} else {
+			client->check_count++;
+			client->check_bytes += ctx->script_size;
+		}
+
+		struct event_passthrough *e =
+			client_command_create_finish_event(cmd)->
+			add_int("compile_warnings",
+				sieve_get_warnings(ehandler));
+		if (ctx->scriptname != NULL) {
+			e_debug(e->event(), "Stored script `%s' successfully "
+				"(%u warnings)", ctx->scriptname,
+				sieve_get_warnings(ehandler));
+		} else {
+			e_debug(e->event(), "Checked script successfully "
+				"(%u warnings)", sieve_get_warnings(ehandler));
+		}
+
+		if (sieve_get_warnings(ehandler) > 0)
+			client_send_okresp(client, "WARNINGS", str_c(errors));
+		else if (ctx->scriptname != NULL)
+			client_send_ok(client, "PUTSCRIPT completed.");
+		else
+			client_send_ok(client, "Script checked successfully.");
+	}
+
+	sieve_error_handler_unref(&ehandler);
+	str_free(&errors);
+}
+
+static void cmd_putscript_handle_script(struct cmd_putscript_context *ctx)
+{
+	struct client_command_context *cmd = ctx->cmd;
+	struct sieve_script *script;
+
+	/* Obtain script object for uploaded script */
+	script = sieve_storage_save_get_tempscript(ctx->save_ctx);
+
+	/* Check result */
+	if (script == NULL) {
+		cmd_putscript_storage_error(ctx);
+		cmd_putscript_finish(ctx);
+		return;
+	}
+
+	/* If quoted string, the size was not known until now */
+	if (!ctx->script_size_valid) {
+		if (sieve_script_get_size(script, &ctx->script_size) < 0) {
+			cmd_putscript_storage_error(ctx);
+			cmd_putscript_finish(ctx);
+			return;
+		}
+		ctx->script_size_valid = TRUE;
+
+		/* Check quota; max size is already checked */
+		if (ctx->scriptname != NULL &&
+		    !managesieve_quota_check_all(cmd, ctx->scriptname,
+						 ctx->script_size)) {
+			cmd_putscript_finish(ctx);
+			return;
+		}
+	}
+
+	/* Try to compile and store the script */
+	T_BEGIN {
+		cmd_putscript_finish_script(ctx, script);
+	} T_END;
+}
+
+static bool cmd_putscript_finish_parsing(struct client_command_context *cmd)
+{
+	struct client *client = cmd->client;
+	struct cmd_putscript_context *ctx = cmd->context;
+	const struct managesieve_arg *args;
+	int ret;
+
+	/* if error occurs, the CRLF is already read. */
+	client->input_skip_line = FALSE;
+
+	/* <script literal> */
+	ret = managesieve_parser_read_args(ctx->save_parser, 0, 0, &args);
+	if (ret == -1 || client->output->closed) {
+		if (ctx->storage != NULL) {
+			const char *msg;
+			bool fatal ATTR_UNUSED;
+
+			msg = managesieve_parser_get_error(
+				ctx->save_parser, &fatal);
+			client_send_command_error(cmd, msg);
+		}
+		cmd_putscript_finish(ctx);
+		return TRUE;
+	}
+	if (ret < 0) {
+		/* need more data */
+		return FALSE;
+	}
+
+	if (MANAGESIEVE_ARG_IS_EOL(&args[0])) {
+		/* Eat away the trailing CRLF */
+		client->input_skip_line = TRUE;
+
+		cmd_putscript_handle_script(ctx);
+		return TRUE;
+	}
+
+	client_send_command_error(cmd, "Too many command arguments.");
+	cmd_putscript_finish(ctx);
+	return TRUE;
+}
+
+static bool cmd_putscript_continue_parsing(struct client_command_context *cmd)
+{
+	struct client *client = cmd->client;
+	struct cmd_putscript_context *ctx = cmd->context;
+	const struct managesieve_arg *args;
+	int ret;
+
+	/* if error occurs, the CRLF is already read. */
+	client->input_skip_line = FALSE;
+
+	/* <script literal> */
+	ret = managesieve_parser_read_args(
+		ctx->save_parser, 0, MANAGESIEVE_PARSE_FLAG_STRING_STREAM,
+		&args);
+	if (ret == -1 || client->output->closed) {
+		cmd_putscript_finish(ctx);
+		client_send_command_error(cmd, "Invalid arguments.");
+		client->input_skip_line = TRUE;
+		return TRUE;
+	}
+	if (ret < 0) {
+		/* need more data */
+		return FALSE;
+	}
+
+	/* Validate the script argument */
+	if (!managesieve_arg_get_string_stream(args,&ctx->input)) {
+		client_send_command_error(cmd, "Invalid arguments.");
+		return cmd_putscript_cancel(ctx, FALSE);
+	}
+
+	if (i_stream_get_size(ctx->input, FALSE, &ctx->script_size) > 0) {
+		ctx->script_size_valid = TRUE;
+
+		/* Check quota */
+		if (ctx->scriptname == NULL) {
+			if (!managesieve_quota_check_validsize(
+				cmd, ctx->script_size))
+				return cmd_putscript_cancel(ctx, TRUE);
+		} else {
+			if (!managesieve_quota_check_all(
+				cmd, ctx->scriptname, ctx->script_size))
+				return cmd_putscript_cancel(ctx, TRUE);
+		}
+
+	} else {
+		ctx->max_script_size =
+			managesieve_quota_max_script_size(client);
+	}
+
+	/* save the script */
+	ctx->save_ctx = sieve_storage_save_init(ctx->storage, ctx->scriptname,
+						ctx->input);
+
+	if (ctx->save_ctx == NULL) {
+		/* save initialization failed */
+		cmd_putscript_storage_error(ctx);
+		return cmd_putscript_cancel(ctx, TRUE);
+	}
+
+	/* after literal comes CRLF, if we fail make sure we eat it away */
+	client->input_skip_line = TRUE;
+
+	client->command_pending = TRUE;
+	cmd->func = cmd_putscript_continue_script;
+	return cmd_putscript_continue_script(cmd);
+}
+
+static bool cmd_putscript_continue_script(struct client_command_context *cmd)
+{
+	struct client *client = cmd->client;
+	struct cmd_putscript_context *ctx = cmd->context;
+	size_t size;
+	int ret;
+
+	if (ctx->save_ctx != NULL) {
+		for (;;) {
+			i_assert(!ctx->script_size_valid ||
+				 ctx->input->v_offset <= ctx->script_size);
+			if (ctx->max_script_size > 0 &&
+			    ctx->input->v_offset > ctx->max_script_size) {
+				(void)managesieve_quota_check_validsize(
+					cmd, ctx->input->v_offset);
+				cmd_putscript_finish(ctx);
+				return TRUE;
+			}
+
+			ret = i_stream_read(ctx->input);
+			if ((ret != -1 || ctx->input->stream_errno != EINVAL ||
+			     client->input->eof) &&
+			    sieve_storage_save_continue(ctx->save_ctx) < 0) {
+				/* we still have to finish reading the script
+			   	  from client */
+				sieve_storage_save_cancel(&ctx->save_ctx);
+				break;
+			}
+			if (ret == -1 || ret == 0)
+				break;
+		}
+	}
+
+	if (ctx->save_ctx == NULL) {
+		(void)i_stream_read(ctx->input);
+		(void)i_stream_get_data(ctx->input, &size);
+		i_stream_skip(ctx->input, size);
+	}
+
+	if (ctx->input->eof || client->input->closed) {
+		bool failed = FALSE;
+		bool all_written = FALSE;
+
+		if (!ctx->script_size_valid) {
+			if (!client->input->eof &&
+			    ctx->input->stream_errno == EINVAL) {
+				client_send_command_error(
+					cmd, t_strdup_printf(
+						"Invalid input: %s",
+						i_stream_get_error(ctx->input)));
+				client->input_skip_line = TRUE;
+				failed = TRUE;
+			}
+			all_written = (ctx->input->eof &&
+				       ctx->input->stream_errno == 0);
+
+		} else {
+			all_written = (ctx->input->v_offset == ctx->script_size);
+		}
+
+		/* finished */
+		ctx->input = NULL;
+
+		if (!failed) {
+			if (ctx->save_ctx == NULL) {
+				/* failed above */
+				cmd_putscript_storage_error(ctx);
+				failed = TRUE;
+			} else if (!all_written) {
+				/* client disconnected before it finished sending the
+					 whole script. */
+				failed = TRUE;
+				sieve_storage_save_cancel(&ctx->save_ctx);
+				const char *reason = t_strdup_printf(
+					"%s (While appending in PUTSCRIPT/CHECKSCRIPT)",
+					io_stream_get_disconnect_reason(client->input,
+									client->output));
+				client_disconnect(client, reason);
+			} else if (sieve_storage_save_finish(ctx->save_ctx) < 0) {
+				failed = TRUE;
+				cmd_putscript_storage_error(ctx);
+			} else {
+				failed = client->input->closed;
+			}
+		}
+
+		if (failed) {
+			cmd_putscript_finish(ctx);
+			return TRUE;
+		}
+
+		/* finish */
+		client->command_pending = FALSE;
+		managesieve_parser_reset(ctx->save_parser);
+		cmd->func = cmd_putscript_finish_parsing;
+		return cmd_putscript_finish_parsing(cmd);
+	}
+
+	return FALSE;
+}
+
+static bool
+cmd_putscript_start(struct client_command_context *cmd, const char *scriptname)
+{
+	struct cmd_putscript_context *ctx;
+	struct client *client = cmd->client;
+
+	ctx = p_new(cmd->pool, struct cmd_putscript_context, 1);
+	ctx->cmd = cmd;
+	ctx->client = client;
+	ctx->storage = client->storage;
+	ctx->scriptname = scriptname;
+
+	io_remove(&client->io);
+	client->io = io_add(i_stream_get_fd(client->input), IO_READ,
+			    client_input_putscript, client);
+	/* putscript is special because we're only waiting on client input, not
+	   client output, so disable the standard output handler until we're
+	   finished */
+	o_stream_unset_flush_callback(client->output);
+
+	ctx->save_parser = managesieve_parser_create(
+		client->input, client->set->managesieve_max_line_length);
+
+	cmd->func = cmd_putscript_continue_parsing;
+	cmd->context = ctx;
+	return cmd_putscript_continue_parsing(cmd);
+
+}
+
+bool cmd_putscript(struct client_command_context *cmd)
+{
+	const char *scriptname;
+
+	/* <scriptname> */
+	if (!client_read_string_args(cmd, FALSE, 1, &scriptname))
+		return FALSE;
+
+	event_add_str(cmd->event, "script_name", scriptname);
+
+	return cmd_putscript_start(cmd, scriptname);
+}
+
+bool cmd_checkscript(struct client_command_context *cmd)
+{
+	return cmd_putscript_start(cmd, NULL);
+}
diff --git a/pigeonhole/src/managesieve/cmd-renamescript.c b/pigeonhole/src/managesieve/cmd-renamescript.c
new file mode 100644
index 0000000..bc7a99d
--- /dev/null
+++ b/pigeonhole/src/managesieve/cmd-renamescript.c
@@ -0,0 +1,54 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+
+#include "sieve.h"
+#include "sieve-script.h"
+#include "sieve-storage.h"
+
+#include "managesieve-common.h"
+#include "managesieve-commands.h"
+
+bool cmd_renamescript(struct client_command_context *cmd)
+{
+	struct client *client = cmd->client;
+	struct sieve_storage *storage = client->storage;
+	const char *scriptname, *newname;
+	struct sieve_script *script;
+
+	/* <oldname> <newname> */
+	if (!client_read_string_args(cmd, TRUE, 2, &scriptname, &newname))
+		return FALSE;
+
+	event_add_str(cmd->event, "old_script_name", scriptname);
+	event_add_str(cmd->event, "new_script_name", newname);
+
+	script = sieve_storage_open_script(storage, scriptname, NULL);
+	if (script == NULL) {
+		client_command_storage_error(
+			cmd, "Failed to open script `%s' for rename to `%s'",
+			scriptname, newname);
+		return TRUE;
+	}
+
+	if (sieve_script_rename(script, newname) < 0) {
+		client_command_storage_error(
+			cmd, "Failed to rename script `%s' to `%s'",
+			scriptname, newname);
+	} else {
+		client->renamed_count++;
+
+		struct event_passthrough *e =
+			client_command_create_finish_event(cmd);
+		e_debug(e->event(), "Renamed script `%s' to `%s'",
+			scriptname, newname);
+
+		client_send_ok(client, "Renamescript completed.");
+	}
+
+	sieve_script_unref(&script);
+	return TRUE;
+}
+
diff --git a/pigeonhole/src/managesieve/cmd-setactive.c b/pigeonhole/src/managesieve/cmd-setactive.c
new file mode 100644
index 0000000..07844c5
--- /dev/null
+++ b/pigeonhole/src/managesieve/cmd-setactive.c
@@ -0,0 +1,165 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+
+#include "sieve.h"
+#include "sieve-script.h"
+#include "sieve-storage.h"
+
+#include "managesieve-common.h"
+#include "managesieve-commands.h"
+
+static void
+cmd_setactive_activate(struct client_command_context *cmd,
+		       const char *scriptname)
+{
+	struct client *client = cmd->client;
+	struct sieve_storage *storage = client->storage;
+	struct sieve_script *script;
+	string_t *errors = NULL;
+	const char *errormsg = NULL;
+	unsigned int warning_count = 0, error_count = 0;
+	bool success = TRUE;
+	int ret;
+
+	event_add_str(cmd->event, "script_name", scriptname);
+
+	script = sieve_storage_open_script(storage, scriptname, NULL);
+	if (script == NULL) {
+		client_command_storage_error(
+			cmd, "Failed to open script `%s' for activation",
+			scriptname);
+		return;
+	}
+
+	if (sieve_script_is_active(script) <= 0) T_BEGIN {
+		/* Script is first being activated; compile it again without the
+		   UPLOAD flag. */
+		struct sieve_error_handler *ehandler;
+		enum sieve_compile_flags cpflags =
+			SIEVE_COMPILE_FLAG_NOGLOBAL |
+			SIEVE_COMPILE_FLAG_ACTIVATED;
+		struct sieve_binary *sbin;
+		enum sieve_error error;
+
+		/* Prepare error handler */
+		errors = str_new(default_pool, 1024);
+		ehandler = sieve_strbuf_ehandler_create(
+			client->svinst, errors, TRUE,
+			client->set->managesieve_max_compile_errors);
+
+		/* Compile */
+		sbin = sieve_compile_script(script, ehandler, cpflags, &error);
+		if (sbin == NULL) {
+			if (error != SIEVE_ERROR_NOT_VALID) {
+				errormsg = sieve_script_get_last_error(
+					script, &error);
+				if (error == SIEVE_ERROR_NONE)
+					errormsg = NULL;
+			}
+			success = FALSE;
+		} else {
+			sieve_close(&sbin);
+		}
+
+		warning_count = sieve_get_warnings(ehandler);
+		error_count = sieve_get_errors(ehandler);
+		sieve_error_handler_unref(&ehandler);
+	} T_END;
+
+	/* Activate only when script is valid (or already active) */
+	if (success) {
+		/* Refresh activation no matter what; this can also
+		   resolve some erroneous situations. */
+		ret = sieve_script_activate(script, (time_t)-1);
+		if (ret < 0) {
+			client_command_storage_error(
+				cmd, "Failed to activate script `%s'",
+				scriptname);
+		} else {
+			struct event_passthrough *e =
+				client_command_create_finish_event(cmd)->
+				add_int("compile_warnings", warning_count);
+			e_debug(e->event(), "Activated script `%s' "
+				" (%u warnings%s)",
+				scriptname, warning_count,
+				(ret == 0 ? ", redundant" : ""));
+
+			if (warning_count > 0) {
+				client_send_okresp(
+					client, "WARNINGS",
+					str_c(errors));
+			} else {
+				client_send_ok(client,
+					(ret > 0 ?
+					 "Setactive completed." :
+					 "Script is already active."));
+			}
+		}
+	} else if (errormsg == NULL) {
+		struct event_passthrough *e =
+			client_command_create_finish_event(cmd)->
+			add_str("error", "Compilation failed")->
+			add_int("compile_errors", error_count)->
+			add_int("compile_warnings", warning_count);
+		e_debug(e->event(), "Failed to activate script `%s': "
+			"Compilation failed (%u errors, %u warnings)",
+			scriptname, error_count, warning_count);
+
+		client_send_no(client, str_c(errors));
+	} else {
+		struct event_passthrough *e =
+			client_command_create_finish_event(cmd)->
+			add_str("error", errormsg);
+		e_debug(e->event(), "Failed to activate script `%s': %s",
+			scriptname, errormsg);
+
+		client_send_no(client, errormsg);
+	}
+
+	if (errors != NULL)
+		str_free(&errors);
+	sieve_script_unref(&script);
+}
+
+static void
+cmd_setactive_deactivate(struct client_command_context *cmd)
+{
+	struct client *client = cmd->client;
+	struct sieve_storage *storage = client->storage;
+	int ret;
+
+	ret = sieve_storage_deactivate(storage, (time_t)-1);
+	if (ret < 0) {
+		client_command_storage_error(
+			cmd, "Failed to deactivate script");
+		return;
+	}
+
+	struct event_passthrough *e =
+		client_command_create_finish_event(cmd);
+	e_debug(e->event(), "Deactivated script");
+
+	client_send_ok(client, (ret > 0 ?
+				"Active script is now deactivated." :
+				"No scripts currently active."));
+}
+
+bool cmd_setactive(struct client_command_context *cmd)
+{
+	const char *scriptname;
+
+	/* <scriptname> */
+	if (!client_read_string_args(cmd, TRUE, 1, &scriptname))
+		return FALSE;
+
+	/* Activate, or deactivate */
+	if (*scriptname != '\0')
+		cmd_setactive_activate(cmd, scriptname);
+	else
+		cmd_setactive_deactivate(cmd);
+
+	return TRUE;
+}
diff --git a/pigeonhole/src/managesieve/main.c b/pigeonhole/src/managesieve/main.c
new file mode 100644
index 0000000..321ebe3
--- /dev/null
+++ b/pigeonhole/src/managesieve/main.c
@@ -0,0 +1,401 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "buffer.h"
+#include "ioloop.h"
+#include "istream.h"
+#include "istream-concat.h"
+#include "ostream.h"
+#include "path-util.h"
+#include "str.h"
+#include "base64.h"
+#include "process-title.h"
+#include "restrict-access.h"
+#include "settings-parser.h"
+#include "master-interface.h"
+#include "master-service.h"
+#include "master-login.h"
+#include "mail-user.h"
+#include "mail-storage-service.h"
+
+#include "managesieve-common.h"
+#include "managesieve-commands.h"
+#include "managesieve-capabilities.h"
+
+#include <stdio.h>
+#include <unistd.h>
+
+#define IS_STANDALONE() \
+        (getenv(MASTER_IS_PARENT_ENV) == NULL)
+
+#define MANAGESIEVE_DIE_IDLE_SECS 10
+
+static bool verbose_proctitle = FALSE;
+static struct mail_storage_service_ctx *storage_service;
+static struct master_login *master_login = NULL;
+
+void (*hook_client_created)(struct client **client) = NULL;
+
+struct event_category event_category_managesieve = {
+	.name = "managesieve",
+};
+
+void managesieve_refresh_proctitle(void)
+{
+#define MANAGESIEVE_PROCTITLE_PREFERRED_LEN 80
+	struct client *client;
+	string_t *title = t_str_new(128);
+
+	if (!verbose_proctitle)
+		return;
+
+	str_append_c(title, '[');
+	switch (managesieve_client_count) {
+	case 0:
+		str_append(title, "idling");
+		break;
+	case 1:
+		client = managesieve_clients;
+		str_append(title, client->user->username);
+		if (client->user->conn.remote_ip != NULL) {
+			str_append_c(title, ' ');
+			str_append(title,
+				   net_ip2addr(client->user->conn.remote_ip));
+		}
+
+		if (client->cmd.name != NULL &&
+		    str_len(title) <= MANAGESIEVE_PROCTITLE_PREFERRED_LEN) {
+			str_append_c(title, ' ');
+			str_append(title, client->cmd.name);
+		}
+		break;
+	default:
+		str_printfa(title, "%u connections", managesieve_client_count);
+		break;
+	}
+	str_append_c(title, ']');
+	process_title_set(str_c(title));
+}
+
+static void client_kill_idle(struct client *client)
+{
+	mail_storage_service_io_activate_user(client->service_user);
+	client_send_bye(client, "Server shutting down.");
+	client_destroy(client, "Server shutting down.");
+}
+
+static void managesieve_die(void)
+{
+	struct client *client, *next;
+	time_t last_io, now = time(NULL);
+	time_t stop_timestamp = now - MANAGESIEVE_DIE_IDLE_SECS;
+	unsigned int stop_msecs;
+
+	for (client = managesieve_clients; client != NULL; client = next) {
+		next = client->next;
+
+		last_io = I_MAX(client->last_input, client->last_output);
+		if (last_io <= stop_timestamp)
+			client_kill_idle(client);
+		else {
+			timeout_remove(&client->to_idle);
+			stop_msecs = (last_io - stop_timestamp) * 1000;
+			client->to_idle = timeout_add(stop_msecs,
+						      client_kill_idle, client);
+		}
+	}
+}
+
+static void client_add_istream_prefix(struct client *client,
+				      const buffer_t *input)
+{
+	struct istream *inputs[] = {
+		i_stream_create_copy_from_data(input->data, input->used),
+		client->input,
+		NULL
+	};
+	client->input = i_stream_create_concat(inputs);
+	i_stream_copy_fd(client->input, inputs[1]);
+	i_stream_unref(&inputs[0]);
+	i_stream_unref(&inputs[1]);
+
+	i_stream_set_input_pending(client->input, TRUE);
+}
+
+static void client_logged_in(struct client *client)
+{
+	struct ostream *output;
+
+	output = client->output;
+	o_stream_ref(output);
+	o_stream_cork(output);
+	if (!IS_STANDALONE())
+		client_send_ok(client, "Logged in.");
+	(void)client_input(client);
+	o_stream_uncork(output);
+	o_stream_unref(&output);
+}
+
+static int
+client_create_from_input(const struct mail_storage_service_input *input,
+			 int fd_in, int fd_out, const buffer_t *input_buf,
+			 const char **error_r)
+{
+	struct mail_storage_service_input service_input;
+	struct mail_storage_service_user *user;
+	struct mail_user *mail_user;
+	struct client *client;
+	struct managesieve_settings *set;
+	struct event *event;
+	const char *error;
+
+	event = event_create(NULL);
+	event_add_category(event, &event_category_managesieve);
+	event_add_fields(event, (const struct event_add_field []){
+		{ .key = "user", .value = input->username },
+		{ .key = "session", .value = input->session_id },
+		{ .key = NULL }
+	});
+
+	service_input = *input;
+	service_input.event_parent = event;
+	if (mail_storage_service_lookup_next(storage_service, &service_input,
+					     &user, &mail_user, error_r) <= 0) {
+		event_unref(&event);
+		return -1;
+	}
+	restrict_access_allow_coredumps(TRUE);
+
+	set = mail_storage_service_user_get_set(user)[1];
+	if (set->verbose_proctitle)
+		verbose_proctitle = TRUE;
+
+	if (settings_var_expand(&managesieve_setting_parser_info, set,
+				mail_user->pool,
+				mail_user_var_expand_table(mail_user),
+				&error) <= 0) {
+		i_error("Failed to expand settings: %s", error);
+		mail_storage_service_user_unref(&user);
+		mail_user_unref(&mail_user);
+		event_unref(&event);
+		return -1;
+	}
+
+	client = client_create(fd_in, fd_out, input->session_id,
+			       event, mail_user, user, set);
+	if (input_buf != NULL && input_buf->used > 0)
+		client_add_istream_prefix(client, input_buf);
+	client_create_finish(client);
+	T_BEGIN {
+		client_logged_in(client);
+	} T_END;
+	event_unref(&event);
+	return 0;
+}
+
+static void main_stdio_run(const char *username)
+{
+	struct mail_storage_service_input input;
+	const char *value, *error, *input_base64;
+	buffer_t *input_buf;
+
+	i_zero(&input);
+	input.module = "managesieve";
+	input.service = "sieve";
+	input.username =  username != NULL ? username : getenv("USER");
+	if (input.username == NULL && IS_STANDALONE())
+		input.username = getlogin();
+	if (input.username == NULL)
+		i_fatal("USER environment missing");
+	if ((value = getenv("IP")) != NULL)
+		net_addr2ip(value, &input.remote_ip);
+	if ((value = getenv("LOCAL_IP")) != NULL)
+		net_addr2ip(value, &input.local_ip);
+
+	input_base64 = getenv("CLIENT_INPUT");
+	input_buf = (input_base64 == NULL ?
+		     NULL : t_base64_decode_str(input_base64));
+
+	if (client_create_from_input(&input, STDIN_FILENO, STDOUT_FILENO,
+				     input_buf, &error) < 0)
+		i_fatal("%s", error);
+}
+
+static void
+login_client_connected(const struct master_login_client *client,
+		       const char *username, const char *const *extra_fields)
+{
+#define MSG_BYE_INTERNAL_ERROR "BYE \""CRITICAL_MSG"\"\r\n"
+	struct mail_storage_service_input input;
+	enum mail_auth_request_flags flags = client->auth_req.flags;
+	const char *error;
+	buffer_t input_buf;
+
+	i_zero(&input);
+	input.module = "managesieve";
+	input.service = "sieve";
+	input.local_ip = client->auth_req.local_ip;
+	input.remote_ip = client->auth_req.remote_ip;
+	input.local_port = client->auth_req.local_port;
+	input.remote_port = client->auth_req.remote_port;
+	input.username = username;
+	input.userdb_fields = extra_fields;
+	input.session_id = client->session_id;
+	if ((flags & MAIL_AUTH_REQUEST_FLAG_CONN_SECURED) != 0)
+		input.conn_secured = TRUE;
+	if ((flags & MAIL_AUTH_REQUEST_FLAG_CONN_SSL_SECURED) != 0)
+		input.conn_ssl_secured = TRUE;
+
+	buffer_create_from_const_data(&input_buf, client->data,
+				      client->auth_req.data_size);
+	if (client_create_from_input(&input, client->fd, client->fd,
+				     &input_buf, &error) < 0) {
+		int fd = client->fd;
+
+		if (write(fd, MSG_BYE_INTERNAL_ERROR,
+			  strlen(MSG_BYE_INTERNAL_ERROR)) < 0) {
+			if (errno != EAGAIN && errno != EPIPE)
+				i_error("write(client) failed: %m");
+		}
+		i_error("%s", error);
+		i_close_fd(&fd);
+		master_service_client_connection_destroyed(master_service);
+	}
+}
+
+static void
+login_client_failed(const struct master_login_client *client,
+		    const char *errormsg)
+{
+	const char *msg;
+
+	msg = t_strdup_printf("NO \"%s\"\r\n", errormsg);
+	if (write(client->fd, msg, strlen(msg)) < 0) {
+		/* ignored */
+	}
+}
+
+static void client_connected(struct master_service_connection *conn)
+{
+	/* when running standalone, we shouldn't even get here */
+	i_assert(master_login != NULL);
+
+	master_service_client_connection_accept(conn);
+	master_login_add(master_login, conn->fd);
+}
+
+int main(int argc, char *argv[])
+{
+	static const struct setting_parser_info *set_roots[] = {
+		&managesieve_setting_parser_info,
+		NULL
+	};
+	struct master_login_settings login_set;
+	enum master_service_flags service_flags = 0;
+	enum mail_storage_service_flags storage_service_flags = 0;
+	const char *username = NULL, *error = NULL;
+	int c;
+
+	i_zero(&login_set);
+	login_set.postlogin_timeout_secs = MASTER_POSTLOGIN_TIMEOUT_DEFAULT;
+
+	if (IS_STANDALONE() && getuid() == 0 &&
+	    net_getpeername(1, NULL, NULL) == 0) {
+		printf("NO \"managesieve binary must not be started from "
+		       "inetd, use managesieve-login instead.\"\n");
+		return 1;
+	}
+
+	if (IS_STANDALONE() || getenv("DUMP_CAPABILITY") != NULL) {
+		service_flags |= MASTER_SERVICE_FLAG_STANDALONE |
+				 MASTER_SERVICE_FLAG_STD_CLIENT;
+	} else {
+		service_flags |= MASTER_SERVICE_FLAG_KEEP_CONFIG_OPEN;
+	}
+	if (getenv("DUMP_CAPABILITY") != NULL) {
+		service_flags |= MASTER_SERVICE_FLAG_DONT_SEND_STATS |
+			MASTER_SERVICE_FLAG_DISABLE_SSL_SET;
+	}
+
+	master_service = master_service_init("managesieve", service_flags,
+					     &argc, &argv, "t:u:");
+	while ((c = master_getopt(master_service)) > 0) {
+		switch (c) {
+		case 't':
+			if (str_to_uint(optarg,
+					&login_set.postlogin_timeout_secs) < 0 ||
+			    login_set.postlogin_timeout_secs == 0)
+				i_fatal("Invalid -t parameter: %s", optarg);
+			break;
+		case 'u':
+			storage_service_flags |=
+				MAIL_STORAGE_SERVICE_FLAG_USERDB_LOOKUP;
+			username = optarg;
+			break;
+		default:
+			return FATAL_DEFAULT;
+		}
+	}
+
+	master_service_set_die_callback(master_service, managesieve_die);
+
+	/* plugins may want to add commands, so this needs to be called early */
+	commands_init();
+
+	/* Dump capabilities if requested */
+	if (getenv("DUMP_CAPABILITY") != NULL) {
+		i_set_debug_file("/dev/null");
+		managesieve_capabilities_dump();
+		commands_deinit();
+		master_service_deinit(&master_service);
+		exit(0);
+	}
+
+	if (t_abspath("auth-master", &login_set.auth_socket_path, &error) < 0)
+		i_fatal("t_abspath(%s) failed: %s", "auth-master", error);
+
+	if (argv[optind] != NULL &&
+	    t_abspath(argv[optind], &login_set.postlogin_socket_path,
+		      &error) < 0) {
+		i_fatal("t_abspath(%s) failed: %s", argv[optind], error);
+	}
+
+	login_set.callback = login_client_connected;
+	login_set.failure_callback = login_client_failed;
+
+	if (!IS_STANDALONE())
+		master_login = master_login_init(master_service, &login_set);
+
+	storage_service =
+		mail_storage_service_init(master_service,
+					  set_roots, storage_service_flags);
+	master_service_init_finish(master_service);
+	/* NOTE: login_set.*_socket_path are now invalid due to data stack
+	   having been freed */
+
+	/* fake that we're running, so we know if client was destroyed
+		while handling its initial input */
+	io_loop_set_running(current_ioloop);
+
+	if (IS_STANDALONE()) {
+		T_BEGIN {
+			main_stdio_run(username);
+		} T_END;
+	} else {
+		io_loop_set_running(current_ioloop);
+	}
+
+	if (io_loop_is_running(current_ioloop))
+		master_service_run(master_service, client_connected);
+	clients_destroy_all();
+
+	if (master_login != NULL)
+		master_login_deinit(&master_login);
+	mail_storage_service_deinit(&storage_service);
+
+	commands_deinit();
+
+	master_service_deinit(&master_service);
+	return 0;
+}
diff --git a/pigeonhole/src/managesieve/managesieve-capabilities.c b/pigeonhole/src/managesieve/managesieve-capabilities.c
new file mode 100644
index 0000000..c72558f
--- /dev/null
+++ b/pigeonhole/src/managesieve/managesieve-capabilities.c
@@ -0,0 +1,136 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "array.h"
+#include "hostpid.h"
+#include "var-expand.h"
+#include "settings-parser.h"
+#include "master-service.h"
+#include "master-service-settings.h"
+#include "master-service-settings-cache.h"
+
+#include "sieve.h"
+
+#include "managesieve-capabilities.h"
+
+#include <stddef.h>
+#include <unistd.h>
+
+/*
+ * Global plugin settings
+ */
+
+struct plugin_settings {
+	ARRAY(const char *) plugin_envs;
+};
+
+static const struct setting_parser_info **plugin_set_roots;
+
+static const struct setting_define plugin_setting_defines[] = {
+	{ .type = SET_STRLIST, .key = "plugin",
+	  .offset = offsetof(struct plugin_settings, plugin_envs) },
+
+	SETTING_DEFINE_LIST_END
+};
+
+static const struct setting_parser_info plugin_setting_parser_info = {
+	.module_name = "managesieve",
+	.defines = plugin_setting_defines,
+
+	.type_offset = (size_t)-1,
+	.struct_size = sizeof(struct plugin_settings),
+
+	.parent_offset = (size_t)-1,
+};
+
+static const struct setting_parser_info *default_plugin_set_roots[] = {
+	&plugin_setting_parser_info,
+	NULL
+};
+
+static const struct setting_parser_info **plugin_set_roots =
+	default_plugin_set_roots;
+
+static struct plugin_settings *plugin_settings_read(void)
+{
+	const char *error;
+
+	if (master_service_settings_read_simple(
+		master_service, plugin_set_roots, &error) < 0)
+		i_fatal("Error reading configuration: %s", error);
+
+	return (struct plugin_settings *)
+		master_service_settings_get_others(master_service)[0];
+}
+
+static const char *
+plugin_settings_get(const struct plugin_settings *set, const char *identifier)
+{
+	const char *const *envs;
+	unsigned int i, count;
+
+	if ( !array_is_created(&set->plugin_envs) )
+		return NULL;
+
+	envs = array_get(&set->plugin_envs, &count);
+	for ( i = 0; i < count; i += 2 ) {
+		if ( strcmp(envs[i], identifier) == 0 )
+			return envs[i+1];
+	}
+	return NULL;
+}
+
+/*
+ * Sieve environment
+ */
+
+static const char *sieve_get_setting(void *context, const char *identifier)
+{
+	const struct plugin_settings *set = context;
+
+	return plugin_settings_get(set, identifier);
+}
+
+static const struct sieve_callbacks sieve_callbacks = {
+	NULL,
+	sieve_get_setting
+};
+
+/*
+ * Capability dumping
+ */
+
+void managesieve_capabilities_dump(void)
+{
+	const struct plugin_settings *global_plugin_settings;
+	struct sieve_environment svenv;
+	struct sieve_instance *svinst;
+	const char *notify_cap;
+
+	/* Read plugin settings */
+
+	global_plugin_settings = plugin_settings_read();
+
+	/* Initialize Sieve engine */
+
+	memset((void*)&svenv, 0, sizeof(svenv));
+	svenv.home_dir = "/tmp";
+
+	svinst = sieve_init(&svenv, &sieve_callbacks,
+			    (void *) global_plugin_settings, FALSE);
+
+	/* Dump capabilities */
+
+	notify_cap = sieve_get_capabilities(svinst, "notify");
+
+	if (notify_cap == NULL)
+		printf("SIEVE: %s\n", sieve_get_capabilities(svinst, NULL));
+	else {
+		printf("SIEVE: %s, NOTIFY: %s\n",
+		       sieve_get_capabilities(svinst, NULL),
+		       sieve_get_capabilities(svinst, "notify"));
+	}
+
+	sieve_deinit(&svinst);
+}
diff --git a/pigeonhole/src/managesieve/managesieve-capabilities.h b/pigeonhole/src/managesieve/managesieve-capabilities.h
new file mode 100644
index 0000000..b7503a9
--- /dev/null
+++ b/pigeonhole/src/managesieve/managesieve-capabilities.h
@@ -0,0 +1,6 @@
+#ifndef MANAGESIEVE_CAPABILITIES_H
+#define MANAGESIEVE_CAPABILITIES_H
+
+void managesieve_capabilities_dump(void);
+
+#endif
diff --git a/pigeonhole/src/managesieve/managesieve-client.c b/pigeonhole/src/managesieve/managesieve-client.c
new file mode 100644
index 0000000..bacf460
--- /dev/null
+++ b/pigeonhole/src/managesieve/managesieve-client.c
@@ -0,0 +1,792 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "llist.h"
+#include "str.h"
+#include "hostpid.h"
+#include "net.h"
+#include "istream.h"
+#include "ostream.h"
+#include "iostream.h"
+#include "iostream-rawlog.h"
+#include "var-expand.h"
+#include "time-util.h"
+#include "master-service.h"
+#include "mail-storage-service.h"
+#include "mail-namespace.h"
+
+#include "sieve.h"
+#include "sieve-storage.h"
+
+#include "managesieve-quote.h"
+#include "managesieve-common.h"
+#include "managesieve-commands.h"
+#include "managesieve-client.h"
+
+#include <unistd.h>
+
+extern struct mail_storage_callbacks mail_storage_callbacks;
+struct managesieve_module_register managesieve_module_register = { 0 };
+
+struct client *managesieve_clients = NULL;
+unsigned int managesieve_client_count = 0;
+
+static const char *
+managesieve_sieve_get_setting(void *context, const char *identifier)
+{
+	struct mail_user *mail_user = (struct mail_user *) context;
+
+	if (mail_user == NULL)
+		return NULL;
+
+	return mail_user_plugin_getenv(mail_user, identifier);
+}
+
+static const struct sieve_callbacks managesieve_sieve_callbacks = {
+	NULL,
+	managesieve_sieve_get_setting
+};
+
+static void client_idle_timeout(struct client *client)
+{
+	if (client->cmd.func != NULL) {
+		client_destroy(client,
+			"Disconnected for inactivity in reading our output");
+	} else {
+		client_send_bye(client, "Disconnected for inactivity");
+		client_destroy(client, "Disconnected for inactivity");
+	}
+}
+
+static struct sieve_storage *
+client_get_storage(struct sieve_instance *svinst, struct mail_user *user,
+		   int fd_out)
+{
+	struct sieve_storage *storage;
+	enum sieve_error error;
+	const char *errormsg, *byemsg;
+
+	/* Open personal script storage */
+
+	storage = sieve_storage_create_main(svinst, user,
+					    SIEVE_STORAGE_FLAG_READWRITE,
+					    &error);
+	if (storage == NULL) {
+		switch (error) {
+		case SIEVE_ERROR_NOT_POSSIBLE:
+			byemsg = "BYE \"Sieve processing is disabled for this user.\"\r\n";
+			errormsg = "Failed to open Sieve storage: "
+				"Sieve is disabled for this user";
+			break;
+		case SIEVE_ERROR_NOT_FOUND:
+			byemsg = "BYE \"This user cannot manage personal Sieve scripts.\"\r\n";
+			errormsg = "Failed to open Sieve storage: "
+				"Personal script storage disabled or not found.";
+			break;
+		default:
+			byemsg = t_strflocaltime(
+				"BYE \""CRITICAL_MSG_STAMP"\"\r\n", ioloop_time);
+			errormsg = "Failed to open Sieve storage.";
+		}
+
+		if (write(fd_out, byemsg, strlen(byemsg)) < 0) {
+			if (errno != EAGAIN && errno != EPIPE)
+				i_error("write(client) failed: %m");
+		}
+		i_fatal("%s", errormsg);
+	}
+
+	return storage;
+}
+
+struct client *
+client_create(int fd_in, int fd_out, const char *session_id,
+	      struct event *event, struct mail_user *user,
+	      struct mail_storage_service_user *service_user,
+	      const struct managesieve_settings *set)
+{
+	struct client *client;
+	const char *ident;
+	struct sieve_environment svenv;
+	struct sieve_instance *svinst;
+	struct sieve_storage *storage;
+	pool_t pool;
+
+	/* Initialize Sieve */
+
+	memset((void*)&svenv, 0, sizeof(svenv));
+	svenv.username = user->username;
+	(void)mail_user_get_home(user, &svenv.home_dir);
+	svenv.base_dir = user->set->base_dir;
+	svenv.event_parent = event;
+	svenv.flags = SIEVE_FLAG_HOME_RELATIVE;
+
+	svinst = sieve_init(&svenv, &managesieve_sieve_callbacks,
+			    (void *) user, set->mail_debug);
+
+	/* Get Sieve storage */
+
+	storage = client_get_storage(svinst, user, fd_out);
+
+	/* always use nonblocking I/O */
+	net_set_nonblock(fd_in, TRUE);
+	net_set_nonblock(fd_out, TRUE);
+
+	pool = pool_alloconly_create("managesieve client", 1024);
+	client = p_new(pool, struct client, 1);
+	client->pool = pool;
+	client->event = event;
+	event_ref(client->event);
+	client->set = set;
+	client->service_user = service_user;
+	client->session_id = p_strdup(pool, session_id);
+	client->fd_in = fd_in;
+	client->fd_out = fd_out;
+	client->input = i_stream_create_fd(
+		fd_in, set->managesieve_max_line_length);
+	client->output = o_stream_create_fd(fd_out, (size_t)-1);
+
+	o_stream_set_no_error_handling(client->output, TRUE);
+	i_stream_set_name(client->input, "<managesieve client>");
+	o_stream_set_name(client->output, "<managesieve client>");
+
+	o_stream_set_flush_callback(client->output, client_output, client);
+
+	client->last_input = ioloop_time;
+	client->to_idle = timeout_add(CLIENT_IDLE_TIMEOUT_MSECS,
+				      client_idle_timeout, client);
+
+	client->cmd.pool = pool_alloconly_create(
+		MEMPOOL_GROWING"client command", 1024*12);
+	client->cmd.client = client;
+	client->cmd.event = event_create(client->event);
+	client->user = user;
+
+	client->svinst = svinst;
+	client->storage = storage;
+
+	ident = mail_user_get_anvil_userip_ident(client->user);
+	if (ident != NULL) {
+		master_service_anvil_send(
+			master_service, t_strconcat("CONNECT\t", my_pid,
+						    "\tsieve/", ident,
+						    "\n", NULL));
+		client->anvil_sent = TRUE;
+	}
+
+	managesieve_client_count++;
+	DLLIST_PREPEND(&managesieve_clients, client);
+	if (hook_client_created != NULL)
+		hook_client_created(&client);
+
+	managesieve_refresh_proctitle();
+	return client;
+}
+
+void client_create_finish(struct client *client)
+{
+	if (client->set->rawlog_dir[0] != '\0') {
+		(void)iostream_rawlog_create(client->set->rawlog_dir,
+					     &client->input, &client->output);
+	}
+	client->parser = managesieve_parser_create(
+		client->input, client->set->managesieve_max_line_length);
+	client->io = io_add_istream(client->input, client_input, client);
+}
+
+static const char *client_stats(struct client *client)
+{
+	const struct var_expand_table logout_tab[] = {
+		{ 'i', dec2str(i_stream_get_absolute_offset(client->input)),
+		  "input" },
+		{ 'o', dec2str(client->output->offset), "output" },
+		{ '\0', dec2str(client->put_bytes), "put_bytes" },
+		{ '\0', dec2str(client->put_count), "put_count" },
+		{ '\0', dec2str(client->get_bytes), "get_bytes" },
+		{ '\0', dec2str(client->get_count), "get_count" },
+		{ '\0', dec2str(client->check_bytes), "check_bytes" },
+		{ '\0', dec2str(client->check_count), "check_count" },
+		{ '\0', dec2str(client->deleted_count), "deleted_count" },
+		{ '\0', dec2str(client->renamed_count), "renamed_count" },
+		{ '\0', client->session_id, "session" },
+		{ '\0', NULL, NULL }
+	};
+	const struct var_expand_table *user_tab =
+		mail_user_var_expand_table(client->user);
+	const struct var_expand_table *tab =
+		t_var_expand_merge_tables(logout_tab, user_tab);
+	string_t *str;
+	const char *error;
+
+	str = t_str_new(128);
+	if (var_expand_with_funcs(str, client->set->managesieve_logout_format,
+				  tab, mail_user_var_expand_func_table,
+				  client->user, &error) < 0) {
+		i_error("Failed to expand managesieve_logout_format=%s: %s",
+			client->set->managesieve_logout_format, error);
+	}
+	return str_c(str);
+}
+
+void client_destroy(struct client *client, const char *reason)
+{
+	bool ret;
+
+ 	i_assert(!client->handling_input);
+	i_assert(!client->destroyed);
+	client->destroyed = TRUE;
+
+	client_disconnect(client, reason);
+
+	if (client->command_pending) {
+		/* try to deinitialize the command */
+		i_assert(client->cmd.func != NULL);
+
+		i_stream_close(client->input);
+		o_stream_close(client->output);
+
+		client->input_pending = FALSE;
+
+		ret = client->cmd.func(&client->cmd);
+		i_assert(ret);
+	}
+
+	if (client->anvil_sent) {
+		master_service_anvil_send(
+			master_service, t_strconcat(
+				"DISCONNECT\t", my_pid, "\tsieve/",
+				mail_user_get_anvil_userip_ident(client->user),
+				"\n", NULL));
+	}
+
+	managesieve_parser_destroy(&client->parser);
+	io_remove(&client->io);
+	timeout_remove(&client->to_idle_output);
+	timeout_remove(&client->to_idle);
+
+	/* i/ostreams are already closed at this stage, so fd can be closed */
+	net_disconnect(client->fd_in);
+	if (client->fd_in != client->fd_out)
+		net_disconnect(client->fd_out);
+
+	/* Free the user after client is already disconnected. It may start
+	   some background work like autoexpunging. */
+	mail_user_unref(&client->user);
+
+	/* free the i/ostreams after mail_user_unref(), which could trigger
+	   mail_storage_callbacks notifications that write to the ostream. */
+	i_stream_destroy(&client->input);
+	o_stream_destroy(&client->output);
+
+	sieve_storage_unref(&client->storage);
+	sieve_deinit(&client->svinst);
+
+	event_unref(&client->cmd.event);
+	pool_unref(&client->cmd.pool);
+	mail_storage_service_user_unref(&client->service_user);
+
+	managesieve_client_count--;
+	DLLIST_REMOVE(&managesieve_clients, client);
+	event_unref(&client->event);
+	pool_unref(&client->pool);
+
+	master_service_client_connection_destroyed(master_service);
+	managesieve_refresh_proctitle();
+}
+
+static void client_destroy_timeout(struct client *client)
+{
+	client_destroy(client, NULL);
+}
+
+void client_disconnect(struct client *client, const char *reason)
+{
+	if (client->disconnected)
+		return;
+
+	if (reason == NULL) {
+		reason = io_stream_get_disconnect_reason(client->input,
+							 client->output);
+		i_info("%s %s", reason, client_stats(client));
+	} else {
+		i_info("Disconnected: %s %s", reason, client_stats(client));
+	}
+	client->disconnected = TRUE;
+	o_stream_flush(client->output);
+	o_stream_uncork(client->output);
+
+	i_stream_close(client->input);
+	o_stream_close(client->output);
+
+	timeout_remove(&client->to_idle);
+	if (!client->destroyed)
+		client->to_idle = timeout_add(0, client_destroy_timeout, client);
+}
+
+void client_disconnect_with_error(struct client *client, const char *msg)
+{
+	client_send_bye(client, msg);
+	client_disconnect(client, msg);
+}
+
+int client_send_line(struct client *client, const char *data)
+{
+	struct const_iovec iov[2];
+
+	if (client->output->closed)
+		return -1;
+
+	iov[0].iov_base = data;
+	iov[0].iov_len = strlen(data);
+	iov[1].iov_base = "\r\n";
+	iov[1].iov_len = 2;
+
+	if (o_stream_sendv(client->output, iov, 2) < 0)
+		return -1;
+	client->last_output = ioloop_time;
+
+	if (o_stream_get_buffer_used_size(client->output) >=
+	    CLIENT_OUTPUT_OPTIMAL_SIZE) {
+		/* buffer full, try flushing */
+		return o_stream_flush(client->output);
+	}
+	return 1;
+}
+
+void client_send_response(struct client *client, const char *oknobye,
+			  const char *resp_code, const char *msg)
+{
+	string_t *str;
+
+	str = t_str_new(128);
+	str_append(str, oknobye);
+
+	if (resp_code != NULL) {
+		str_append(str, " (");
+		str_append(str, resp_code);
+		str_append_c(str, ')');
+	}
+
+	if (msg != NULL) {
+		str_append_c(str, ' ');
+		managesieve_quote_append_string(str, msg, TRUE);
+	}
+
+	client_send_line(client, str_c(str));
+}
+
+struct event_passthrough *
+client_command_create_finish_event(struct client_command_context *cmd)
+{
+	struct event_passthrough *e =
+		event_create_passthrough(cmd->event)->
+		set_name("managesieve_command_finished");
+	return e;
+}
+
+void client_send_command_error(struct client_command_context *cmd,
+			       const char *msg)
+{
+	struct client *client = cmd->client;
+	const char *error, *cmd_name;
+	bool fatal;
+
+	if (msg == NULL) {
+		msg = managesieve_parser_get_error(client->parser, &fatal);
+		if (fatal) {
+			client_disconnect_with_error(client, msg);
+			return;
+		}
+	}
+
+	if (cmd->name == NULL) {
+		error = t_strconcat("Error in MANAGESIEVE command: ",
+				    msg, NULL);
+	} else {
+		cmd_name = t_str_ucase(cmd->name);
+		error = t_strconcat("Error in MANAGESIEVE command ",
+				    cmd_name, ": ", msg, NULL);
+	}
+
+	client_send_no(client, error);
+
+	if (++client->bad_counter >= CLIENT_MAX_BAD_COMMANDS) {
+		client_disconnect_with_error(
+			client, "Too many invalid MANAGESIEVE commands.");
+	}
+
+	/* client_read_args() failures rely on this being set, so that the
+	   command processing is stopped even while command function returns
+	   FALSE. */
+	cmd->param_error = TRUE;
+}
+
+#undef client_command_storage_error
+void client_command_storage_error(struct client_command_context *cmd,
+				  const char *source_filename,
+				  unsigned int source_linenum,
+				  const char *log_prefix, ...)
+{
+	struct event_log_params params = {
+		.log_type = LOG_TYPE_INFO,
+		.source_filename = source_filename,
+		.source_linenum = source_linenum,
+	};
+	struct client *client = cmd->client;
+	struct sieve_storage *storage = client->storage;
+	enum sieve_error error_code;
+	const char *error;
+	va_list args;
+
+	error = sieve_storage_get_last_error(storage, &error_code);
+
+	switch (error_code) {
+	case SIEVE_ERROR_TEMP_FAILURE:
+		client_send_noresp(client, "TRYLATER", error);
+		break;
+	case SIEVE_ERROR_NO_QUOTA:
+		client_send_noresp(client, "QUOTA", error);
+		break;
+	case SIEVE_ERROR_NOT_FOUND:
+		client_send_noresp(client, "NONEXISTENT", error);
+		break;
+	case SIEVE_ERROR_ACTIVE:
+		client_send_noresp(client, "ACTIVE", error);
+		break;
+	case SIEVE_ERROR_EXISTS:
+		client_send_noresp(client, "ALREADYEXISTS", error);
+		break;
+	case SIEVE_ERROR_NOT_POSSIBLE:
+	default:
+		client_send_no(client, error);
+		break;
+	}
+
+	struct event_passthrough *e =
+		client_command_create_finish_event(cmd)->
+		add_str("error", error);
+
+	va_start(args, log_prefix);
+	event_log(e->event(), &params, "%s: %s",
+		  t_strdup_vprintf(log_prefix, args), error);
+	va_end(args);
+}
+
+bool client_read_args(struct client_command_context *cmd, unsigned int count,
+		      unsigned int flags, bool no_more,
+		      const struct managesieve_arg **args_r)
+{
+	const struct managesieve_arg *dummy_args_r = NULL;
+	string_t *str;
+	int ret;
+
+	if (args_r == NULL)
+		args_r = &dummy_args_r;
+
+	i_assert(count <= INT_MAX);
+
+	ret = managesieve_parser_read_args(cmd->client->parser,
+					   (no_more ? 0 : count),
+					   flags, args_r);
+	if (ret >= 0) {
+		if (count > 0 || no_more) {
+			if (ret < (int)count) {
+				client_send_command_error(
+					cmd, "Missing arguments.");
+				return FALSE;
+			} else if (no_more && ret > (int)count) {
+				client_send_command_error(
+					cmd, "Too many arguments.");
+				return FALSE;
+			}
+		}
+
+		str = t_str_new(256);
+		managesieve_write_args(str, *args_r);
+		cmd->args = p_strdup(cmd->pool, str_c(str));
+
+		event_add_str(cmd->event, "cmd_args", cmd->args);
+
+		/* all parameters read successfully */
+		return TRUE;
+	} else if (ret == -2) {
+		/* need more data */
+		if (cmd->client->input->closed) {
+			/* disconnected */
+ 			cmd->param_error = TRUE;
+		}
+		return FALSE;
+	} else {
+		/* error */
+		client_send_command_error(cmd, NULL);
+		return FALSE;
+	}
+}
+
+bool client_read_string_args(struct client_command_context *cmd,
+			     bool no_more, unsigned int count, ...)
+{
+	const struct managesieve_arg *msieve_args;
+	va_list va;
+	const char *str;
+	unsigned int i;
+	bool result = TRUE;
+
+	if (!client_read_args(cmd, count, 0, no_more, &msieve_args))
+		return FALSE;
+
+	va_start(va, count);
+	for (i = 0; i < count; i++) {
+		const char **ret = va_arg(va, const char **);
+
+		if (MANAGESIEVE_ARG_IS_EOL(&msieve_args[i])) {
+			client_send_command_error(cmd, "Missing arguments.");
+			result = FALSE;
+			break;
+		}
+
+		if (!managesieve_arg_get_string(&msieve_args[i], &str)) {
+			client_send_command_error(cmd, "Invalid arguments.");
+			result = FALSE;
+			break;
+		}
+
+		if (ret != NULL)
+			*ret = str;
+	}
+	va_end(va);
+
+	return result;
+}
+
+void _client_reset_command(struct client *client)
+{
+	pool_t pool;
+	size_t size;
+
+	/* reset input idle time because command output might have taken a long
+	   time and we don't want to disconnect client immediately then */
+	client->last_input = ioloop_time;
+	timeout_reset(client->to_idle);
+
+	client->command_pending = FALSE;
+	if (client->io == NULL && !client->disconnected) {
+		i_assert(i_stream_get_fd(client->input) >= 0);
+		client->io = io_add(i_stream_get_fd(client->input),
+				    IO_READ, client_input, client);
+	}
+	o_stream_set_flush_callback(client->output, client_output, client);
+
+	event_unref(&client->cmd.event);
+
+	pool = client->cmd.pool;
+	i_zero(&client->cmd);
+
+	p_clear(pool);
+	client->cmd.pool = pool;
+	client->cmd.client = client;
+
+	client->cmd.event = event_create(client->event);
+
+	managesieve_parser_reset(client->parser);
+
+	/* if there's unread data in buffer, remember that there's input pending
+	   and we should get around to calling client_input() soon. This is
+	   mostly for APPEND/IDLE. */
+	(void)i_stream_get_data(client->input, &size);
+	if (size > 0 && !client->destroyed)
+		client->input_pending = TRUE;
+}
+
+/* Skip incoming data until newline is found,
+   returns TRUE if newline was found. */
+static bool client_skip_line(struct client *client)
+{
+	const unsigned char *data;
+	size_t i, data_size;
+
+	data = i_stream_get_data(client->input, &data_size);
+
+	for (i = 0; i < data_size; i++) {
+		if (data[i] == '\n') {
+			client->input_skip_line = FALSE;
+			i++;
+			break;
+		}
+	}
+
+	i_stream_skip(client->input, i);
+	return !client->input_skip_line;
+}
+
+static bool client_handle_input(struct client_command_context *cmd)
+{
+	struct client *client = cmd->client;
+
+	if (cmd->func != NULL) {
+		bool finished;
+
+		event_push_global(cmd->event);
+		finished = cmd->func(cmd);
+		event_pop_global(cmd->event);
+
+		/* command is being executed - continue it */
+		if (finished || cmd->param_error) {
+			/* command execution was finished */
+			if (!cmd->param_error)
+				client->bad_counter = 0;
+			_client_reset_command(client);
+			return TRUE;
+		}
+
+		/* unfinished */
+		if (client->command_pending)
+			o_stream_set_flush_pending(client->output, TRUE);
+		return FALSE;
+	}
+
+	if (client->input_skip_line) {
+		/* we're just waiting for new line.. */
+		if (!client_skip_line(client))
+			return FALSE;
+
+		/* got the newline */
+		_client_reset_command(client);
+
+		/* pass through to parse next command */
+	}
+
+	if (cmd->name == NULL) {
+		cmd->name = managesieve_parser_read_word(client->parser);
+		if (cmd->name == NULL)
+			return FALSE; /* need more data */
+		cmd->name = p_strdup(cmd->pool, cmd->name);
+		managesieve_refresh_proctitle();
+	}
+
+	if (cmd->name[0] == '\0') {
+		/* command not given - cmd_func is already NULL. */
+	} else {
+		/* find the command function */
+		struct command *command = command_find(cmd->name);
+
+		if (command != NULL)
+			cmd->func = command->func;
+	}
+
+	client->input_skip_line = TRUE;
+	if (cmd->func == NULL) {
+		/* unknown command */
+		client_send_command_error(cmd, "Unknown command.");
+		_client_reset_command(client);
+	} else {
+		i_assert(!client->disconnected);
+
+		event_add_str(cmd->event, "cmd_name", t_str_ucase(cmd->name));
+		client_handle_input(cmd);
+	}
+
+	return TRUE;
+}
+
+void client_input(struct client *client)
+{
+	struct client_command_context *cmd = &client->cmd;
+	bool ret;
+
+	if (client->command_pending) {
+		/* already processing one command. wait. */
+		io_remove(&client->io);
+		return;
+	}
+
+	client->input_pending = FALSE;
+	client->last_input = ioloop_time;
+	timeout_reset(client->to_idle);
+
+	switch (i_stream_read(client->input)) {
+	case -1:
+		/* disconnected */
+		client_destroy(client, NULL);
+		return;
+	case -2:
+		/* parameter word is longer than max. input buffer size.
+		   this is most likely an error, so skip the new data
+		   until newline is found. */
+		client->input_skip_line = TRUE;
+
+		client_send_command_error(cmd, "Too long argument.");
+		_client_reset_command(client);
+		break;
+	}
+
+	client->handling_input = TRUE;
+	o_stream_cork(client->output);
+	do {
+		T_BEGIN {
+			ret = client_handle_input(cmd);
+		} T_END;
+	} while (ret && !client->disconnected);
+	o_stream_uncork(client->output);
+	client->handling_input = FALSE;
+
+	if (client->command_pending)
+		client->input_pending = TRUE;
+
+	if (client->output->closed)
+		client_destroy(client, NULL);
+}
+
+int client_output(struct client *client)
+{
+	struct client_command_context *cmd = &client->cmd;
+	int ret;
+	bool finished;
+
+	client->last_output = ioloop_time;
+	timeout_reset(client->to_idle);
+	if (client->to_idle_output != NULL)
+		timeout_reset(client->to_idle_output);
+
+	if ((ret = o_stream_flush(client->output)) < 0) {
+		client_destroy(client, NULL);
+		return 1;
+	}
+
+	if (!client->command_pending)
+		return 1;
+
+	/* continue processing command */
+	o_stream_cork(client->output);
+	client->output_pending = TRUE;
+	finished = cmd->func(cmd) || cmd->param_error;
+
+	/* a bit kludgy check. normally we would want to get back to this
+	   output handler, but IDLE is a special case which has command
+	   pending but without necessarily anything to write. */
+	if (!finished && client->output_pending)
+		o_stream_set_flush_pending(client->output, TRUE);
+
+	o_stream_uncork(client->output);
+
+	if (finished) {
+		/* command execution was finished */
+		client->bad_counter = 0;
+		_client_reset_command(client);
+
+		if (client->input_pending)
+			client_input(client);
+	}
+	return ret;
+}
+
+void clients_destroy_all(void)
+{
+	while (managesieve_clients != NULL) {
+		mail_storage_service_io_activate_user(managesieve_clients->service_user);
+		client_send_bye(managesieve_clients, "Server shutting down.");
+		client_destroy(managesieve_clients, "Server shutting down.");
+	}
+}
diff --git a/pigeonhole/src/managesieve/managesieve-client.h b/pigeonhole/src/managesieve/managesieve-client.h
new file mode 100644
index 0000000..6053eb6
--- /dev/null
+++ b/pigeonhole/src/managesieve/managesieve-client.h
@@ -0,0 +1,162 @@
+#ifndef MANAGESIEVE_CLIENT_H
+#define MANAGESIEVE_CLIENT_H
+
+#include "managesieve-commands.h"
+
+struct client;
+struct sieve_storage;
+struct managesieve_parser;
+struct managesieve_arg;
+
+struct client_command_context {
+	struct client *client;
+	struct event *event;
+
+	pool_t pool;
+	/* Name of this command */
+	const char *name;
+	/* Parameters for this command. These are generated from parsed
+	   ManageSieve arguments, so they may not be exactly the same as how
+	   client sent them. */
+	const char *args;
+
+	command_func_t *func;
+	void *context;
+
+	bool param_error:1;
+};
+
+struct managesieve_module_register {
+	unsigned int id;
+};
+
+union managesieve_module_context {
+	struct managesieve_module_register *reg;
+};
+extern struct managesieve_module_register managesieve_module_register;
+
+struct client {
+	struct client *prev, *next;
+
+	struct event *event;
+	const char *session_id;
+	int fd_in, fd_out;
+	struct io *io;
+	struct istream *input;
+	struct ostream *output;
+	struct timeout *to_idle, *to_idle_output;
+
+	pool_t pool;
+	struct mail_storage_service_user *service_user;
+	const struct managesieve_settings *set;
+
+	struct mail_user *user;
+
+	struct sieve_instance *svinst;
+	struct sieve_storage *storage;
+
+	time_t last_input, last_output;
+	unsigned int bad_counter;
+
+	struct managesieve_parser *parser;
+	struct client_command_context cmd;
+
+	uoff_t put_bytes;
+	uoff_t get_bytes;
+	uoff_t check_bytes;
+	unsigned int put_count;
+	unsigned int get_count;
+	unsigned int check_count;
+	unsigned int deleted_count;
+	unsigned int renamed_count;
+
+	bool disconnected:1;
+	bool destroyed:1;
+	bool command_pending:1;
+	bool input_pending:1;
+	bool output_pending:1;
+	bool handling_input:1;
+	bool anvil_sent:1;
+	bool input_skip_line:1; /* skip all the data until we've found a new
+	                           line */
+};
+
+extern struct client *managesieve_clients;
+extern unsigned int managesieve_client_count;
+
+/* Create new client with specified input/output handles. socket specifies
+   if the handle is a socket. */
+struct client *
+client_create(int fd_in, int fd_out, const char *session_id,
+	      struct event *event, struct mail_user *user,
+	      struct mail_storage_service_user *service_user,
+	      const struct managesieve_settings *set);
+void client_create_finish(struct client *client);
+void client_destroy(struct client *client, const char *reason);
+
+void client_dump_capability(struct client *client);
+
+/* Disconnect client connection */
+void client_disconnect(struct client *client, const char *reason);
+void client_disconnect_with_error(struct client *client, const char *msg);
+
+/* Send a line of data to client. Returns 1 if ok, 0 if buffer is getting full,
+   -1 if error */
+int client_send_line(struct client *client, const char *data);
+
+void client_send_response(struct client *client, const char *oknobye,
+			  const char *resp_code, const char *msg);
+
+#define client_send_ok(client, msg) \
+	client_send_response(client, "OK", NULL, msg)
+#define client_send_no(client, msg) \
+	client_send_response(client, "NO", NULL, msg)
+#define client_send_bye(client, msg) \
+	client_send_response(client, "BYE", NULL, msg)
+
+#define client_send_okresp(client, resp_code, msg) \
+	client_send_response(client, "OK", resp_code, msg)
+#define client_send_noresp(client, resp_code, msg) \
+	client_send_response(client, "NO", resp_code, msg)
+#define client_send_byeresp(cmd, resp_code, msg) \
+	client_send_response(client, "BYE", resp_code, msg)
+
+struct event_passthrough *
+client_command_create_finish_event(struct client_command_context *cmd);
+
+/* Send BAD command error to client. msg can be NULL. */
+void client_send_command_error(struct client_command_context *cmd,
+			       const char *msg);
+
+/* Send storage or sieve-related errors to the client. Returns command finish
+   event with the "error" field set accordingly. */
+void client_command_storage_error(struct client_command_context *cmd,
+				  const char *source_filename,
+				  unsigned int source_linenum,
+				  const char *log_prefix, ...)
+				  ATTR_FORMAT(4, 5);
+#define client_command_storage_error(cmd, ...) \
+	client_command_storage_error(cmd, __FILE__, __LINE__, __VA_ARGS__)
+
+/* Read a number of arguments. Returns TRUE if everything was read or
+   FALSE if either needs more data or error occurred. */
+bool client_read_args(struct client_command_context *cmd, unsigned int count,
+		      unsigned int flags, bool no_more,
+		      const struct managesieve_arg **args_r);
+/* Reads a number of string arguments. ... is a list of pointers where to
+   store the arguments. */
+bool client_read_string_args(struct client_command_context *cmd, bool no_more,
+			     unsigned int count, ...);
+
+static inline bool client_read_no_args(struct client_command_context *cmd)
+{
+	return client_read_args(cmd, 0, 0, TRUE, NULL);
+}
+
+void _client_reset_command(struct client *client);
+void client_input(struct client *client);
+int client_output(struct client *client);
+
+void clients_destroy_all(void);
+
+#endif
diff --git a/pigeonhole/src/managesieve/managesieve-commands.c b/pigeonhole/src/managesieve/managesieve-commands.c
new file mode 100644
index 0000000..87e2048
--- /dev/null
+++ b/pigeonhole/src/managesieve/managesieve-commands.c
@@ -0,0 +1,110 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "array.h"
+
+#include "managesieve-common.h"
+#include "managesieve-commands.h"
+
+
+/* May want to combine this somewhere in a commands-common.c to avoid duplicate
+   code
+ */
+
+static const struct command managesieve_base_commands[] = {
+	{ "CAPABILITY", cmd_capability },
+	{ "LOGOUT", cmd_logout },
+	{ "PUTSCRIPT", cmd_putscript },
+	{ "CHECKSCRIPT", cmd_checkscript },
+	{ "GETSCRIPT", cmd_getscript },
+	{ "SETACTIVE", cmd_setactive },
+	{ "DELETESCRIPT", cmd_deletescript },
+	{ "LISTSCRIPTS", cmd_listscripts },
+	{ "HAVESPACE", cmd_havespace },
+	{ "RENAMESCRIPT", cmd_renamescript },
+	{ "NOOP", cmd_noop }
+};
+
+#define MANAGESIEVE_COMMANDS_COUNT N_ELEMENTS(managesieve_base_commands)
+
+static ARRAY(struct command) managesieve_commands;
+static bool commands_unsorted;
+
+void command_register(const char *name, command_func_t *func)
+{
+	struct command cmd;
+
+	i_zero(&cmd);
+	cmd.name = name;
+	cmd.func = func;
+	array_append(&managesieve_commands, &cmd, 1);
+
+	commands_unsorted = TRUE;
+}
+
+void command_unregister(const char *name)
+{
+	const struct command *cmd;
+	unsigned int i, count;
+
+	cmd = array_get(&managesieve_commands, &count);
+	for (i = 0; i < count; i++) {
+		if (strcasecmp(cmd[i].name, name) == 0) {
+			array_delete(&managesieve_commands, i, 1);
+			return;
+		}
+	}
+
+	i_error("Trying to unregister unknown command '%s'", name);
+}
+
+void command_register_array(const struct command *cmdarr, unsigned int count)
+{
+	commands_unsorted = TRUE;
+	array_append(&managesieve_commands, cmdarr, count);
+}
+
+void command_unregister_array(const struct command *cmdarr, unsigned int count)
+{
+	while (count > 0) {
+		command_unregister(cmdarr->name);
+		count--; cmdarr++;
+	}
+}
+
+static int command_cmp(const struct command *c1, const struct command *c2)
+{
+	return strcasecmp(c1->name, c2->name);
+}
+
+static int command_bsearch(const char *name, const struct command *cmd)
+{
+	return strcasecmp(name, cmd->name);
+}
+
+struct command *command_find(const char *name)
+{
+	if (commands_unsorted) {
+		array_sort(&managesieve_commands, command_cmp);
+		commands_unsorted = FALSE;
+	}
+
+	return array_bsearch(&managesieve_commands, name, command_bsearch);
+}
+
+void commands_init(void)
+{
+	i_array_init(&managesieve_commands, 16);
+	commands_unsorted = FALSE;
+
+	command_register_array(managesieve_base_commands,
+			       MANAGESIEVE_COMMANDS_COUNT);
+}
+
+void commands_deinit(void)
+{
+	command_unregister_array(managesieve_base_commands,
+				 MANAGESIEVE_COMMANDS_COUNT);
+	array_free(&managesieve_commands);
+}
diff --git a/pigeonhole/src/managesieve/managesieve-commands.h b/pigeonhole/src/managesieve/managesieve-commands.h
new file mode 100644
index 0000000..d922b74
--- /dev/null
+++ b/pigeonhole/src/managesieve/managesieve-commands.h
@@ -0,0 +1,46 @@
+#ifndef MANAGESIEVE_COMMANDS_H
+#define MANAGESIEVE_COMMANDS_H
+
+struct client_command_context;
+
+#include "managesieve-parser.h"
+
+typedef bool command_func_t(struct client_command_context *cmd);
+
+struct command {
+	const char *name;
+	command_func_t *func;
+};
+
+/* Register command. Given name parameter must be permanently stored until
+   command is unregistered. */
+void command_register(const char *name, command_func_t *func);
+void command_unregister(const char *name);
+
+/* Register array of commands. */
+void command_register_array(const struct command *cmdarr, unsigned int count);
+void command_unregister_array(const struct command *cmdarr, unsigned int count);
+
+struct command *command_find(const char *name);
+
+void commands_init(void);
+void commands_deinit(void);
+
+/* MANAGESIEVE commands: */
+
+/* Non-Authenticated State */
+extern bool cmd_logout(struct client_command_context *cmd);
+extern bool cmd_capability(struct client_command_context *cmd);
+extern bool cmd_noop(struct client_command_context *cmd);
+
+/* Authenticated State */
+extern bool cmd_putscript(struct client_command_context *cmd);
+extern bool cmd_checkscript(struct client_command_context *cmd);
+extern bool cmd_getscript(struct client_command_context *cmd);
+extern bool cmd_setactive(struct client_command_context *cmd);
+extern bool cmd_deletescript(struct client_command_context *cmd);
+extern bool cmd_listscripts(struct client_command_context *cmd);
+extern bool cmd_havespace(struct client_command_context *cmd);
+extern bool cmd_renamescript(struct client_command_context *cmd);
+
+#endif
diff --git a/pigeonhole/src/managesieve/managesieve-common.h b/pigeonhole/src/managesieve/managesieve-common.h
new file mode 100644
index 0000000..e1df589
--- /dev/null
+++ b/pigeonhole/src/managesieve/managesieve-common.h
@@ -0,0 +1,31 @@
+#ifndef MANAGESIEVE_COMMON_H
+#define MANAGESIEVE_COMMON_H
+
+#include "pigeonhole-config.h"
+
+/* Disconnect client after idling this many milliseconds */
+#define CLIENT_IDLE_TIMEOUT_MSECS (60*30*1000)
+
+/* If we can't send anything to client for this long, disconnect the client */
+#define CLIENT_OUTPUT_TIMEOUT_MSECS (5*60*1000)
+
+/* Stop buffering more data into output stream after this many bytes */
+#define CLIENT_OUTPUT_OPTIMAL_SIZE 2048
+
+/* Disconnect client when it sends too many bad commands in a row */
+#define CLIENT_MAX_BAD_COMMANDS 20
+
+#define CRITICAL_MSG \
+  "Internal error occurred. Refer to server log for more information."
+#define CRITICAL_MSG_STAMP CRITICAL_MSG " [%Y-%m-%d %H:%M:%S]"
+
+#include "lib.h"
+#include "managesieve-client.h"
+#include "managesieve-settings.h"
+
+extern void (*hook_client_created)(struct client **client);
+extern struct event_category event_category_managesieve;
+
+void managesieve_refresh_proctitle(void);
+
+#endif
diff --git a/pigeonhole/src/managesieve/managesieve-quota.c b/pigeonhole/src/managesieve/managesieve-quota.c
new file mode 100644
index 0000000..07b58ca
--- /dev/null
+++ b/pigeonhole/src/managesieve/managesieve-quota.c
@@ -0,0 +1,98 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "strfuncs.h"
+
+#include "sieve.h"
+#include "sieve-storage.h"
+
+#include "managesieve-client.h"
+#include "managesieve-quota.h"
+
+uint64_t managesieve_quota_max_script_size(struct client *client)
+{
+	return sieve_storage_quota_max_script_size(client->storage);
+}
+
+bool managesieve_quota_check_validsize(struct client_command_context *cmd,
+				       size_t size)
+{
+	struct client *client = cmd->client;
+	uint64_t limit;
+
+	if (!sieve_storage_quota_validsize(client->storage, size, &limit)) {
+		const char *error_msg;
+
+		error_msg = t_strdup_printf(
+			"Script is too large (max %llu bytes).",
+			(unsigned long long int)limit);
+
+		struct event_passthrough *e =
+			client_command_create_finish_event(cmd);
+		e_debug(e->event(),
+			"Script size check failed (size %zu bytes): %s",
+			size, error_msg);
+
+		client_send_noresp(client, "QUOTA/MAXSIZE", error_msg);
+		return FALSE;
+	}
+	return TRUE;
+}
+
+bool managesieve_quota_check_all(struct client_command_context *cmd,
+				 const char *scriptname, size_t size)
+{
+	struct client *client = cmd->client;
+	enum sieve_storage_quota quota;
+	uint64_t limit;
+	const char *resp_code = NULL, *error_msg = NULL;
+	int ret;
+
+	ret = sieve_storage_quota_havespace(client->storage, scriptname,
+					    size, &quota, &limit);
+	if (ret > 0)
+		return TRUE;
+	if (ret < 0) {
+		client_command_storage_error(
+			cmd, "Failed to check quota for script `%s' "
+			     "(size %zu bytes)", scriptname, size);
+		return FALSE;
+	}
+
+	switch (quota) {
+	case SIEVE_STORAGE_QUOTA_MAXSIZE:
+		resp_code = "QUOTA/MAXSIZE";
+		error_msg = t_strdup_printf("Script is too large "
+					    "(max %llu bytes).",
+					    (unsigned long long int)limit);
+		break;
+	case SIEVE_STORAGE_QUOTA_MAXSCRIPTS:
+		resp_code = "QUOTA/MAXSCRIPTS";
+		error_msg = t_strdup_printf("Script count quota exceeded "
+					    "(max %llu scripts).",
+					    (unsigned long long int)limit);
+		break;
+	case SIEVE_STORAGE_QUOTA_MAXSTORAGE:
+		resp_code = "QUOTA/MAXSTORAGE";
+		error_msg = t_strdup_printf("Script storage quota exceeded "
+					    "(max %llu bytes).",
+					    (unsigned long long int)limit);
+		break;
+	default:
+		resp_code = "QUOTA";
+		error_msg = "Quota exceeded.";
+	}
+
+	struct event_passthrough *e =
+		client_command_create_finish_event(cmd)->
+		add_str("error", error_msg);
+	e_debug(e->event(),
+		"Quota check failed for script `%s' (size %zu bytes): %s",
+		scriptname, size, error_msg);
+
+	client_send_noresp(client, resp_code, error_msg);
+
+	return FALSE;
+}
+
diff --git a/pigeonhole/src/managesieve/managesieve-quota.h b/pigeonhole/src/managesieve/managesieve-quota.h
new file mode 100644
index 0000000..f6b37bf
--- /dev/null
+++ b/pigeonhole/src/managesieve/managesieve-quota.h
@@ -0,0 +1,11 @@
+#ifndef MANAGESIEVE_QUOTA_H
+#define MANAGESIEVE_QUOTA_H
+
+uint64_t managesieve_quota_max_script_size(struct client *client);
+
+bool managesieve_quota_check_validsize(struct client_command_context *cmd,
+				       size_t size);
+bool managesieve_quota_check_all(struct client_command_context *cmd,
+				 const char *scriptname, size_t size);
+
+#endif
diff --git a/pigeonhole/src/managesieve/managesieve-settings.c b/pigeonhole/src/managesieve/managesieve-settings.c
new file mode 100644
index 0000000..8e6e88b
--- /dev/null
+++ b/pigeonhole/src/managesieve/managesieve-settings.c
@@ -0,0 +1,170 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "buffer.h"
+#include "settings-parser.h"
+#include "service-settings.h"
+#include "mail-storage-settings.h"
+
+#include "pigeonhole-config.h"
+
+#include "managesieve-settings.h"
+
+#include <stddef.h>
+#include <unistd.h>
+
+static bool managesieve_settings_verify(void *_set, pool_t pool,
+				 const char **error_r);
+
+/* <settings checks> */
+static struct file_listener_settings managesieve_unix_listeners_array[] = {
+	{ "login/sieve", 0666, "", "" }
+};
+static struct file_listener_settings *managesieve_unix_listeners[] = {
+	&managesieve_unix_listeners_array[0]
+};
+static buffer_t managesieve_unix_listeners_buf = {
+	{ { managesieve_unix_listeners, sizeof(managesieve_unix_listeners) } }
+};
+/* </settings checks> */
+
+struct service_settings managesieve_settings_service_settings = {
+	.name = "managesieve",
+	.protocol = "sieve",
+	.type = "",
+	.executable = "managesieve",
+	.user = "",
+	.group = "",
+	.privileged_group = "",
+	.extra_groups = "",
+	.chroot = "",
+
+	.drop_priv_before_exec = FALSE,
+
+	.process_min_avail = 0,
+	.process_limit = 0,
+	.client_limit = 1,
+	.service_count = 1,
+	.idle_kill = 0,
+	.vsz_limit = (uoff_t)-1,
+
+	.unix_listeners = { { &managesieve_unix_listeners_buf,
+				   sizeof(managesieve_unix_listeners[0]) } },
+	.fifo_listeners = ARRAY_INIT,
+	.inet_listeners = ARRAY_INIT
+};
+
+#undef DEF
+#define DEF(type, name) \
+	SETTING_DEFINE_STRUCT_##type(#name, name, struct managesieve_settings)
+
+static struct setting_define managesieve_setting_defines[] = {
+	DEF(BOOL, mail_debug),
+	DEF(BOOL, verbose_proctitle),
+	DEF(STR_VARS, rawlog_dir),
+
+	DEF(SIZE, managesieve_max_line_length),
+	DEF(STR, managesieve_implementation_string),
+	DEF(STR, managesieve_client_workarounds),
+	DEF(STR, managesieve_logout_format),
+	DEF(UINT, managesieve_max_compile_errors),
+
+
+	SETTING_DEFINE_LIST_END
+};
+
+static struct managesieve_settings managesieve_default_settings = {
+	.mail_debug = FALSE,
+	.verbose_proctitle = FALSE,
+	.rawlog_dir = "",
+
+	/* RFC-2683 recommends at least 8000 bytes. Some clients however don't
+	   break large message sets to multiple commands, so we're pretty
+	   liberal by default. */
+	.managesieve_max_line_length = 65536,
+	.managesieve_implementation_string = DOVECOT_NAME " " PIGEONHOLE_NAME,
+	.managesieve_client_workarounds = "",
+	.managesieve_logout_format = "bytes=%i/%o",
+	.managesieve_max_compile_errors = 5
+};
+
+static const struct setting_parser_info *managesieve_setting_dependencies[] = {
+	&mail_user_setting_parser_info,
+	NULL
+};
+
+const struct setting_parser_info managesieve_setting_parser_info = {
+	.module_name = "managesieve",
+	.defines = managesieve_setting_defines,
+	.defaults = &managesieve_default_settings,
+
+	.type_offset = (size_t)-1,
+	.struct_size = sizeof(struct managesieve_settings),
+
+	.parent_offset = (size_t)-1,
+	.parent = NULL,
+
+	.check_func = managesieve_settings_verify,
+	.dependencies = managesieve_setting_dependencies
+};
+
+const struct setting_parser_info *managesieve_settings_set_roots[] = {
+	&managesieve_setting_parser_info,
+	NULL
+};
+
+/* <settings checks> */
+struct managesieve_client_workaround_list {
+	const char *name;
+	enum managesieve_client_workarounds num;
+};
+
+static const struct managesieve_client_workaround_list
+managesieve_client_workaround_list[] = {
+	{ NULL, 0 }
+};
+
+static int
+managesieve_settings_parse_workarounds(struct managesieve_settings *set,
+				       const char **error_r)
+{
+	enum managesieve_client_workarounds client_workarounds = 0;
+	const struct managesieve_client_workaround_list *list;
+	const char *const *str;
+
+	str = t_strsplit_spaces(set->managesieve_client_workarounds, " ,");
+	for (; *str != NULL; str++) {
+		list = managesieve_client_workaround_list;
+		for (; list->name != NULL; list++) {
+			if (strcasecmp(*str, list->name) == 0) {
+				client_workarounds |= list->num;
+				break;
+			}
+		}
+		if (list->name == NULL) {
+			*error_r = t_strdup_printf(
+				"managesieve_client_workarounds: "
+				"Unknown workaround: %s", *str);
+			return -1;
+		}
+	}
+	set->parsed_workarounds = client_workarounds;
+	return 0;
+}
+
+
+static bool
+managesieve_settings_verify(void *_set, pool_t pool ATTR_UNUSED,
+			    const char **error_r)
+{
+	struct managesieve_settings *set = _set;
+
+	if (managesieve_settings_parse_workarounds(set, error_r) < 0)
+		return FALSE;
+	return TRUE;
+}
+
+/* </settings checks> */
+
+const char *managesieve_settings_version = DOVECOT_ABI_VERSION;
diff --git a/pigeonhole/src/managesieve/managesieve-settings.h b/pigeonhole/src/managesieve/managesieve-settings.h
new file mode 100644
index 0000000..a72338b
--- /dev/null
+++ b/pigeonhole/src/managesieve/managesieve-settings.h
@@ -0,0 +1,29 @@
+#ifndef MANAGESIEVE_SETTINGS_H
+#define MANAGESIEVE_SETTINGS_H
+
+struct mail_user_settings;
+
+/* <settings checks> */
+enum managesieve_client_workarounds {
+	WORKAROUND_NONE = 0x00
+};
+/* </settings checks> */
+
+struct managesieve_settings {
+	bool mail_debug;
+	bool verbose_proctitle;
+	const char *rawlog_dir;
+
+	/* managesieve: */
+	uoff_t managesieve_max_line_length;
+	const char *managesieve_implementation_string;
+	const char *managesieve_client_workarounds;
+	const char *managesieve_logout_format;
+	unsigned int managesieve_max_compile_errors;
+
+	enum managesieve_client_workarounds parsed_workarounds;
+};
+
+extern const struct setting_parser_info managesieve_setting_parser_info;
+
+#endif
diff --git a/pigeonhole/src/plugins/Makefile.am b/pigeonhole/src/plugins/Makefile.am
new file mode 100644
index 0000000..b6c7551
--- /dev/null
+++ b/pigeonhole/src/plugins/Makefile.am
@@ -0,0 +1,7 @@
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+	doveadm-sieve \
+	lda-sieve \
+	sieve-extprograms \
+	imapsieve \
+	imap-filter-sieve \
+	settings
diff --git a/pigeonhole/src/plugins/Makefile.in b/pigeonhole/src/plugins/Makefile.in
new file mode 100644
index 0000000..890ce14
--- /dev/null
+++ b/pigeonhole/src/plugins/Makefile.in
@@ -0,0 +1,699 @@
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new file mode 100644
index 0000000..9f98dab
--- /dev/null
+++ b/pigeonhole/src/plugins/doveadm-sieve/Makefile.am
@@ -0,0 +1,31 @@
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+
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diff --git a/pigeonhole/src/plugins/doveadm-sieve/Makefile.in b/pigeonhole/src/plugins/doveadm-sieve/Makefile.in
new file mode 100644
index 0000000..be3b853
--- /dev/null
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+	-rm -f ./$(DEPDIR)/doveadm-sieve-cmd-put.Plo
+	-rm -f ./$(DEPDIR)/doveadm-sieve-cmd-rename.Plo
+	-rm -f ./$(DEPDIR)/doveadm-sieve-cmd.Plo
+	-rm -f ./$(DEPDIR)/doveadm-sieve-plugin.Plo
+	-rm -f ./$(DEPDIR)/doveadm-sieve-sync.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-doveadm_moduleLTLIBRARIES
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-doveadm_moduleLTLIBRARIES clean-generic clean-libtool \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-doveadm_moduleLTLIBRARIES \
+	install-dvi install-dvi-am install-exec install-exec-am \
+	install-html install-html-am install-info install-info-am \
+	install-man install-pdf install-pdf-am install-ps \
+	install-ps-am install-strip installcheck installcheck-am \
+	installdirs maintainer-clean maintainer-clean-generic \
+	mostlyclean mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool pdf pdf-am ps ps-am tags tags-am uninstall \
+	uninstall-am uninstall-doveadm_moduleLTLIBRARIES
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd-activate.c b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd-activate.c
new file mode 100644
index 0000000..f392478
--- /dev/null
+++ b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd-activate.c
@@ -0,0 +1,145 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "doveadm-mail.h"
+
+#include "sieve.h"
+#include "sieve-script.h"
+#include "sieve-storage.h"
+
+#include "doveadm-sieve-cmd.h"
+
+struct doveadm_sieve_activate_cmd_context {
+	struct doveadm_sieve_cmd_context ctx;
+
+	const char *scriptname;
+};
+
+static int
+cmd_sieve_activate_run(struct doveadm_sieve_cmd_context *_ctx)
+{
+	struct doveadm_sieve_activate_cmd_context *ctx =
+		(struct doveadm_sieve_activate_cmd_context *)_ctx;
+	struct sieve_storage *storage = _ctx->storage;
+	struct sieve_script *script;
+	enum sieve_error error;
+	int ret = 0;
+
+	script = sieve_storage_open_script
+		(storage, ctx->scriptname, NULL);
+	if ( script == NULL ) {
+		i_error("Failed to activate Sieve script: %s",
+			sieve_storage_get_last_error(storage, &error));
+		doveadm_sieve_cmd_failed_error(_ctx, error);
+		return -1;
+	}
+
+	if ( sieve_script_is_active(script) <= 0 ) {
+		/* Script is first being activated; compile it again without the UPLOAD
+		 * flag.
+		 */
+		struct sieve_error_handler *ehandler;
+		enum sieve_compile_flags cpflags =
+			SIEVE_COMPILE_FLAG_NOGLOBAL | SIEVE_COMPILE_FLAG_ACTIVATED;
+		struct sieve_binary *sbin;
+		enum sieve_error error;
+
+		/* Compile */
+		ehandler = sieve_master_ehandler_create(ctx->ctx.svinst, 0);
+		if ( (sbin=sieve_compile_script
+			(script, ehandler, cpflags, &error)) == NULL ) {
+			doveadm_sieve_cmd_failed_error(_ctx, error);
+			ret = -1;
+		} else {
+			sieve_close(&sbin);
+		}
+		sieve_error_handler_unref(&ehandler);
+	}
+
+	/* Activate only when script is valid (or already active) */
+	if ( ret == 0 ) {
+		/* Refresh activation no matter what; this can also resolve some erroneous
+		 * situations.
+		 */
+		ret = sieve_script_activate(script, (time_t)-1);
+		if ( ret < 0 ) {
+			i_error("Failed to activate Sieve script: %s",
+				sieve_storage_get_last_error(storage, &error));
+			doveadm_sieve_cmd_failed_error(_ctx, error);
+			ret = -1;
+		}
+	}
+
+	sieve_script_unref(&script);
+	return ret;
+}
+
+static int cmd_sieve_deactivate_run
+(struct doveadm_sieve_cmd_context *_ctx)
+{
+	struct sieve_storage *storage = _ctx->storage;
+	enum sieve_error error;
+
+	if (sieve_storage_deactivate(storage, (time_t)-1) < 0) {
+		i_error("Failed to deactivate Sieve script: %s",
+			sieve_storage_get_last_error(storage, &error));
+		doveadm_sieve_cmd_failed_error(_ctx, error);
+		return -1;
+	}
+	return 0;
+}
+
+static void cmd_sieve_activate_init
+(struct doveadm_mail_cmd_context *_ctx,
+	const char *const args[])
+{
+	struct doveadm_sieve_activate_cmd_context *ctx =
+		(struct doveadm_sieve_activate_cmd_context *)_ctx;
+
+	if (str_array_length(args) != 1)
+		doveadm_mail_help_name("sieve activate");
+	doveadm_sieve_cmd_scriptnames_check(args);
+
+	ctx->scriptname = p_strdup(ctx->ctx.ctx.pool, args[0]);
+}
+
+static struct doveadm_mail_cmd_context *
+cmd_sieve_activate_alloc(void)
+{
+	struct doveadm_sieve_activate_cmd_context *ctx;
+
+	ctx = doveadm_sieve_cmd_alloc(struct doveadm_sieve_activate_cmd_context);
+	ctx->ctx.ctx.v.init = cmd_sieve_activate_init;
+	ctx->ctx.v.run = cmd_sieve_activate_run;
+	return &ctx->ctx.ctx;
+}
+
+static struct doveadm_mail_cmd_context *
+cmd_sieve_deactivate_alloc(void)
+{
+	struct doveadm_sieve_cmd_context *ctx;
+
+	ctx = doveadm_sieve_cmd_alloc(struct doveadm_sieve_cmd_context);
+	ctx->v.run = cmd_sieve_deactivate_run;
+	return &ctx->ctx;
+}
+
+struct doveadm_cmd_ver2 doveadm_sieve_cmd_activate = {
+	.name = "sieve activate",
+	.mail_cmd = cmd_sieve_activate_alloc,
+	.usage = DOVEADM_CMD_MAIL_USAGE_PREFIX"<scriptname>",
+DOVEADM_CMD_PARAMS_START
+DOVEADM_CMD_MAIL_COMMON
+DOVEADM_CMD_PARAM('\0',"scriptname",CMD_PARAM_STR,CMD_PARAM_FLAG_POSITIONAL)
+DOVEADM_CMD_PARAMS_END
+};
+
+struct doveadm_cmd_ver2 doveadm_sieve_cmd_deactivate = {
+	.name = "sieve deactivate",
+	.mail_cmd = cmd_sieve_deactivate_alloc,
+	.usage = DOVEADM_CMD_MAIL_USAGE_PREFIX,
+DOVEADM_CMD_PARAMS_START
+DOVEADM_CMD_MAIL_COMMON
+DOVEADM_CMD_PARAMS_END
+};
diff --git a/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd-delete.c b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd-delete.c
new file mode 100644
index 0000000..8517abd
--- /dev/null
+++ b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd-delete.c
@@ -0,0 +1,116 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "array.h"
+#include "doveadm-mail.h"
+
+#include "sieve.h"
+#include "sieve-script.h"
+#include "sieve-storage.h"
+
+#include "doveadm-sieve-cmd.h"
+
+struct doveadm_sieve_delete_cmd_context {
+	struct doveadm_sieve_cmd_context ctx;
+
+	ARRAY_TYPE(const_string) scriptnames;
+	bool ignore_active:1;
+};
+
+static int
+cmd_sieve_delete_run(struct doveadm_sieve_cmd_context *_ctx)
+{
+	struct doveadm_sieve_delete_cmd_context *ctx =
+		(struct doveadm_sieve_delete_cmd_context *)_ctx;
+	struct sieve_storage *storage = _ctx->storage;
+	const ARRAY_TYPE(const_string) *scriptnames = &ctx->scriptnames;
+	const char *scriptname;
+	struct sieve_script *script;
+	enum sieve_error error;
+	int ret = 0;
+
+	array_foreach_elem(scriptnames, scriptname) {
+		int sret = 0;
+
+		script = sieve_storage_open_script
+			(storage, scriptname, NULL);
+		if (script == NULL) {
+			sret =  -1;
+		} else {
+			if (sieve_script_delete(script, ctx->ignore_active) < 0) {
+				(void)sieve_storage_get_last_error(storage, &error);
+				sret = -1;
+			}
+			sieve_script_unref(&script);
+		}
+			
+		if (sret < 0) {
+			i_error("Failed to delete Sieve script: %s",
+				sieve_storage_get_last_error(storage, &error));
+			doveadm_sieve_cmd_failed_error(_ctx, error);
+			ret = -1;
+		}
+	}
+	return ret;
+}
+
+static void cmd_sieve_delete_init
+(struct doveadm_mail_cmd_context *_ctx,
+	const char *const args[])
+{
+	struct doveadm_sieve_delete_cmd_context *ctx =
+		(struct doveadm_sieve_delete_cmd_context *)_ctx;
+	const char *name;
+	unsigned int i;
+
+	if (args[0] == NULL)
+		doveadm_mail_help_name("sieve delete");
+	doveadm_sieve_cmd_scriptnames_check(args);
+
+	for (i = 0; args[i] != NULL; i++) {
+		name = p_strdup(ctx->ctx.ctx.pool, args[i]);
+		array_append(&ctx->scriptnames, &name, 1);
+	}
+}
+
+static bool
+cmd_sieve_delete_parse_arg(struct doveadm_mail_cmd_context *_ctx, int c)
+{
+	struct doveadm_sieve_delete_cmd_context *ctx =
+		(struct doveadm_sieve_delete_cmd_context *)_ctx;
+
+	switch ( c ) {
+	case 'a':
+		ctx->ignore_active = TRUE;
+		break;
+	default:
+		return FALSE;
+	}
+	return TRUE;
+}
+
+static struct doveadm_mail_cmd_context *
+cmd_sieve_delete_alloc(void)
+{
+	struct doveadm_sieve_delete_cmd_context *ctx;
+
+	ctx = doveadm_sieve_cmd_alloc(struct doveadm_sieve_delete_cmd_context);
+	ctx->ctx.ctx.getopt_args = "a";
+	ctx->ctx.ctx.v.parse_arg = cmd_sieve_delete_parse_arg;
+	ctx->ctx.ctx.v.init = cmd_sieve_delete_init;
+	ctx->ctx.v.run = cmd_sieve_delete_run;
+	p_array_init(&ctx->scriptnames, ctx->ctx.ctx.pool, 16);
+	return &ctx->ctx.ctx;
+}
+
+struct doveadm_cmd_ver2 doveadm_sieve_cmd_delete = {
+	.name = "sieve delete",
+	.mail_cmd = cmd_sieve_delete_alloc,
+	.usage = DOVEADM_CMD_MAIL_USAGE_PREFIX"[-a] <scriptname> [...]",
+DOVEADM_CMD_PARAMS_START
+DOVEADM_CMD_MAIL_COMMON
+DOVEADM_CMD_PARAM('a',"ignore-active",CMD_PARAM_BOOL,0)
+DOVEADM_CMD_PARAM('\0',"scriptname",CMD_PARAM_ARRAY,CMD_PARAM_FLAG_POSITIONAL)
+DOVEADM_CMD_PARAMS_END
+};
diff --git a/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd-get.c b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd-get.c
new file mode 100644
index 0000000..e1bf7e3
--- /dev/null
+++ b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd-get.c
@@ -0,0 +1,83 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "doveadm-print.h"
+#include "doveadm-mail.h"
+
+#include "sieve.h"
+#include "sieve-script.h"
+#include "sieve-storage.h"
+
+#include "doveadm-sieve-cmd.h"
+
+struct doveadm_sieve_get_cmd_context {
+	struct doveadm_sieve_cmd_context ctx;
+
+	const char *scriptname;
+};
+
+static int
+cmd_sieve_get_run(struct doveadm_sieve_cmd_context *_ctx)
+{
+	struct doveadm_sieve_get_cmd_context *ctx =
+		(struct doveadm_sieve_get_cmd_context *)_ctx;
+	struct sieve_script *script;
+	struct istream *input;
+	enum sieve_error error;
+	int ret;
+
+	script = sieve_storage_open_script
+		(_ctx->storage, ctx->scriptname, &error);
+	if ( script == NULL || sieve_script_get_stream
+		(script, &input, &error) < 0 ) {
+		i_error("Failed to open Sieve script: %s",
+			sieve_storage_get_last_error(_ctx->storage, &error));
+		doveadm_sieve_cmd_failed_error(_ctx, error);
+		if (script != NULL)
+			sieve_script_unref(&script);
+		return -1;
+	}
+
+	ret = doveadm_print_istream(input);
+	sieve_script_unref(&script);
+	return ret;
+}
+
+static void cmd_sieve_get_init
+(struct doveadm_mail_cmd_context *_ctx,
+	const char *const args[])
+{
+	struct doveadm_sieve_get_cmd_context *ctx =
+		(struct doveadm_sieve_get_cmd_context *)_ctx;
+
+	if ( str_array_length(args) != 1 )
+		doveadm_mail_help_name("sieve get");
+	doveadm_sieve_cmd_scriptnames_check(args);
+
+	ctx->scriptname = p_strdup(ctx->ctx.ctx.pool, args[0]);
+
+	doveadm_print_header_simple("sieve script");
+}
+
+static struct doveadm_mail_cmd_context *
+cmd_sieve_get_alloc(void)
+{
+	struct doveadm_sieve_get_cmd_context *ctx;
+
+	ctx = doveadm_sieve_cmd_alloc(struct doveadm_sieve_get_cmd_context);
+	ctx->ctx.ctx.v.init = cmd_sieve_get_init;
+	ctx->ctx.v.run = cmd_sieve_get_run;
+	doveadm_print_init("pager");
+	return &ctx->ctx.ctx;
+}
+
+struct doveadm_cmd_ver2 doveadm_sieve_cmd_get = {
+	.name = "sieve get",
+	.mail_cmd = cmd_sieve_get_alloc,
+	.usage = DOVEADM_CMD_MAIL_USAGE_PREFIX"<scriptname>",
+DOVEADM_CMD_PARAMS_START
+DOVEADM_CMD_MAIL_COMMON
+DOVEADM_CMD_PARAM('\0',"scriptname",CMD_PARAM_STR,CMD_PARAM_FLAG_POSITIONAL)
+DOVEADM_CMD_PARAMS_END
+};
diff --git a/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd-list.c b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd-list.c
new file mode 100644
index 0000000..0dbf379
--- /dev/null
+++ b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd-list.c
@@ -0,0 +1,79 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "doveadm-print.h"
+#include "doveadm-mail.h"
+
+#include "sieve.h"
+#include "sieve-storage.h"
+
+#include "doveadm-sieve-cmd.h"
+
+static int
+cmd_sieve_list_run(struct doveadm_sieve_cmd_context *_ctx)
+{
+	struct sieve_storage *storage = _ctx->storage;
+	struct sieve_storage_list_context *lctx;
+	enum sieve_error error;
+	const char *scriptname;
+	bool active;
+
+	if ( (lctx = sieve_storage_list_init(storage))
+		== NULL ) {
+		i_error("Listing Sieve scripts failed: %s",
+			sieve_storage_get_last_error(storage, &error));
+		doveadm_sieve_cmd_failed_error(_ctx, error);
+		return -1;
+	}
+
+	while ( (scriptname=sieve_storage_list_next(lctx, &active))
+		!= NULL ) {
+		doveadm_print(scriptname);
+		if ( active )
+			doveadm_print("ACTIVE");
+		else
+			doveadm_print("");
+	}
+
+	if ( sieve_storage_list_deinit(&lctx) < 0 ) {
+		i_error("Listing Sieve scripts failed: %s",
+			sieve_storage_get_last_error(storage, &error));
+		doveadm_sieve_cmd_failed_error(_ctx, error);
+		return -1;
+	}
+	return 0;
+}
+
+static void cmd_sieve_list_init
+(struct doveadm_mail_cmd_context *_ctx ATTR_UNUSED,
+	const char *const args[] ATTR_UNUSED)
+{
+	doveadm_print_header("script", "script",
+		DOVEADM_PRINT_HEADER_FLAG_HIDE_TITLE);
+	doveadm_print_header("active", "active",
+		DOVEADM_PRINT_HEADER_FLAG_HIDE_TITLE);
+}
+
+static struct doveadm_mail_cmd_context *
+cmd_sieve_list_alloc(void)
+{
+	struct doveadm_sieve_cmd_context *ctx;
+
+	ctx = doveadm_sieve_cmd_alloc(struct doveadm_sieve_cmd_context);
+	ctx->ctx.v.init = cmd_sieve_list_init;
+	ctx->ctx.getopt_args = "s";
+	ctx->v.run = cmd_sieve_list_run;
+	doveadm_print_init(DOVEADM_PRINT_TYPE_FLOW);
+	return &ctx->ctx;
+}
+
+struct doveadm_cmd_ver2 doveadm_sieve_cmd_list = {
+	.name = "sieve list",
+	.mail_cmd = cmd_sieve_list_alloc,
+	.usage = DOVEADM_CMD_MAIL_USAGE_PREFIX,
+DOVEADM_CMD_PARAMS_START
+DOVEADM_CMD_MAIL_COMMON
+DOVEADM_CMD_PARAMS_END
+};
+
diff --git a/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd-put.c b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd-put.c
new file mode 100644
index 0000000..ef9472d
--- /dev/null
+++ b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd-put.c
@@ -0,0 +1,189 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "istream.h"
+#include "doveadm-mail.h"
+
+#include "sieve.h"
+#include "sieve-script.h"
+#include "sieve-storage.h"
+
+#include "doveadm-sieve-cmd.h"
+
+struct doveadm_sieve_put_cmd_context {
+	struct doveadm_sieve_cmd_context ctx;
+
+	const char *scriptname;
+	
+	bool activate:1;
+};
+
+static int cmd_sieve_put_run
+(struct doveadm_sieve_cmd_context *_ctx)
+{
+	struct doveadm_sieve_put_cmd_context *ctx =
+		(struct doveadm_sieve_put_cmd_context *)_ctx;
+	struct sieve_storage_save_context *save_ctx;
+	struct sieve_storage *storage = _ctx->storage;
+	struct istream *input = _ctx->ctx.cmd_input;
+	enum sieve_error error;
+	ssize_t ret;
+	bool save_failed = FALSE;
+
+	save_ctx = sieve_storage_save_init
+		(storage, ctx->scriptname, input);
+	if ( save_ctx == NULL ) {
+		i_error("Saving failed: %s",
+			sieve_storage_get_last_error(storage, &error));
+		doveadm_sieve_cmd_failed_error(_ctx, error);
+		return -1;
+	}
+
+	while ( (ret = i_stream_read(input)) > 0 || ret == -2 ) {
+		if ( sieve_storage_save_continue(save_ctx) < 0 ) {
+			save_failed = TRUE;
+			ret = -1;
+			break;
+		}
+	}
+	i_assert(ret == -1);
+
+	if ( input->stream_errno != 0 ) {
+		i_error("read(script input) failed: %s", i_stream_get_error(input));
+		doveadm_sieve_cmd_failed_error
+			(&ctx->ctx, SIEVE_ERROR_TEMP_FAILURE);
+	} else if ( save_failed ) {
+		i_error("Saving failed: %s",
+			sieve_storage_get_last_error(storage, NULL));
+		doveadm_sieve_cmd_failed_storage(&ctx->ctx, storage);
+	} else if ( sieve_storage_save_finish(save_ctx) < 0 ) {
+		i_error("Saving failed: %s",
+			sieve_storage_get_last_error(storage, NULL));
+		doveadm_sieve_cmd_failed_storage(&ctx->ctx, storage);
+	} else {
+		ret = 0;
+	}
+
+	/* Verify that script compiles */
+	if ( ret == 0 ) {
+		struct sieve_error_handler *ehandler;
+		enum sieve_compile_flags cpflags =
+			SIEVE_COMPILE_FLAG_NOGLOBAL | SIEVE_COMPILE_FLAG_UPLOADED;
+		struct sieve_script *script;
+		struct sieve_binary *sbin;
+
+		/* Obtain script object for uploaded script */
+		script = sieve_storage_save_get_tempscript(save_ctx);
+
+		/* Check result */
+		if ( script == NULL ) {
+			i_error("Saving failed: %s",
+				sieve_storage_get_last_error(storage, &error));
+			doveadm_sieve_cmd_failed_error(_ctx, error);
+			ret = -1;
+
+		} else {
+			/* Mark this as an activation when we are replacing the active script */
+			if ( ctx->activate || sieve_storage_save_will_activate(save_ctx) )
+				cpflags |= SIEVE_COMPILE_FLAG_ACTIVATED;
+
+			/* Compile */
+			ehandler = sieve_master_ehandler_create(ctx->ctx.svinst, 0);
+			if ( (sbin=sieve_compile_script
+				(script, ehandler, cpflags, &error)) == NULL ) {
+				doveadm_sieve_cmd_failed_error(_ctx, error);
+				ret = -1;
+			} else {
+				sieve_close(&sbin);
+
+				/* Script is valid; commit it to storage */
+				ret = sieve_storage_save_commit(&save_ctx);
+				if (ret < 0) {
+					i_error("Saving failed: %s",
+						sieve_storage_get_last_error(storage, &error));
+					doveadm_sieve_cmd_failed_error(_ctx, error);
+					ret = -1;
+				}
+			}
+			sieve_error_handler_unref(&ehandler);
+		}
+	}
+
+	if ( save_ctx != NULL )
+		sieve_storage_save_cancel(&save_ctx);
+
+	if ( ctx->activate && ret == 0 ) {
+		struct sieve_script *script = sieve_storage_open_script
+			(storage, ctx->scriptname, NULL);
+		if ( script == NULL ||
+			sieve_script_activate(script, (time_t)-1) < 0) {
+			i_error("Failed to activate Sieve script: %s",
+				sieve_storage_get_last_error(storage, &error));
+			doveadm_sieve_cmd_failed_error(_ctx, error);
+			ret = -1;
+		}
+		if (script != NULL)
+			sieve_script_unref(&script);
+	}
+
+	i_assert(input->eof);
+	return ret < 0 ? -1 : 0;
+}
+
+static void cmd_sieve_put_init
+(struct doveadm_mail_cmd_context *_ctx,
+	const char *const args[])
+{
+	struct doveadm_sieve_put_cmd_context *ctx =
+		(struct doveadm_sieve_put_cmd_context *)_ctx;
+
+	if ( str_array_length(args) != 1 )
+		doveadm_mail_help_name("sieve put");
+	doveadm_sieve_cmd_scriptnames_check(args);
+
+	ctx->scriptname = p_strdup(ctx->ctx.ctx.pool, args[0]);
+
+	doveadm_mail_get_input(_ctx);
+}
+
+static bool
+cmd_sieve_put_parse_arg(struct doveadm_mail_cmd_context *_ctx, int c)
+{
+	struct doveadm_sieve_put_cmd_context *ctx =
+		(struct doveadm_sieve_put_cmd_context *)_ctx;
+
+	switch ( c ) {
+	case 'a':
+		ctx->activate = TRUE;
+		break;
+	default:
+		return FALSE;
+	}
+	return TRUE;
+}
+
+static struct doveadm_mail_cmd_context *
+cmd_sieve_put_alloc(void)
+{
+	struct doveadm_sieve_put_cmd_context *ctx;
+
+	ctx = doveadm_sieve_cmd_alloc(struct doveadm_sieve_put_cmd_context);
+	ctx->ctx.ctx.getopt_args = "a";
+	ctx->ctx.ctx.v.parse_arg = cmd_sieve_put_parse_arg;
+	ctx->ctx.ctx.v.init = cmd_sieve_put_init;
+	ctx->ctx.v.run = cmd_sieve_put_run;
+	return &ctx->ctx.ctx;
+}
+
+struct doveadm_cmd_ver2 doveadm_sieve_cmd_put = {
+	.name = "sieve put",
+	.mail_cmd = cmd_sieve_put_alloc,
+	.usage = DOVEADM_CMD_MAIL_USAGE_PREFIX"[-a] <scriptname>",
+DOVEADM_CMD_PARAMS_START
+DOVEADM_CMD_MAIL_COMMON
+DOVEADM_CMD_PARAM('a',"activate",CMD_PARAM_BOOL,0)
+DOVEADM_CMD_PARAM('\0',"scriptname",CMD_PARAM_STR,CMD_PARAM_FLAG_POSITIONAL)
+DOVEADM_CMD_PARAM('\0',"file",CMD_PARAM_ISTREAM,CMD_PARAM_FLAG_POSITIONAL)
+DOVEADM_CMD_PARAMS_END
+};
diff --git a/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd-rename.c b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd-rename.c
new file mode 100644
index 0000000..3cc53c7
--- /dev/null
+++ b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd-rename.c
@@ -0,0 +1,83 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "doveadm-mail.h"
+
+#include "sieve.h"
+#include "sieve-script.h"
+#include "sieve-storage.h"
+
+#include "doveadm-sieve-cmd.h"
+
+struct doveadm_sieve_rename_cmd_context {
+	struct doveadm_sieve_cmd_context ctx;
+
+	const char *oldname, *newname;
+};
+
+static int
+cmd_sieve_rename_run(struct doveadm_sieve_cmd_context *_ctx)
+{
+	struct doveadm_sieve_rename_cmd_context *ctx =
+		(struct doveadm_sieve_rename_cmd_context *)_ctx;
+	struct sieve_storage *storage = _ctx->storage;
+	struct sieve_script *script;
+	enum sieve_error error;
+	int ret = 0;
+
+	script = sieve_storage_open_script
+		(storage, ctx->oldname, NULL);
+	if ( script == NULL ) {
+		i_error("Failed to rename Sieve script: %s",
+			sieve_storage_get_last_error(storage, &error));
+		doveadm_sieve_cmd_failed_error(_ctx, error);
+		ret = -1;
+	} else if ( sieve_script_rename(script, ctx->newname) < 0 ) {
+		i_error("Failed to rename Sieve script: %s",
+			sieve_storage_get_last_error(storage, &error));
+		doveadm_sieve_cmd_failed_error(_ctx, error);
+		ret = -1;
+	}
+
+	if ( script != NULL )
+		sieve_script_unref(&script);
+	return ret;
+}
+
+static void cmd_sieve_rename_init
+(struct doveadm_mail_cmd_context *_ctx,
+	const char *const args[])
+{
+	struct doveadm_sieve_rename_cmd_context *ctx =
+		(struct doveadm_sieve_rename_cmd_context *)_ctx;
+
+	if ( str_array_length(args) != 2 )
+		doveadm_mail_help_name("sieve rename");
+	doveadm_sieve_cmd_scriptnames_check(args);
+
+	ctx->oldname = p_strdup(ctx->ctx.ctx.pool, args[0]);
+	ctx->newname = p_strdup(ctx->ctx.ctx.pool, args[1]);
+}
+
+static struct doveadm_mail_cmd_context *
+cmd_sieve_rename_alloc(void)
+{
+	struct doveadm_sieve_rename_cmd_context *ctx;
+
+	ctx = doveadm_sieve_cmd_alloc(struct doveadm_sieve_rename_cmd_context);
+	ctx->ctx.ctx.v.init = cmd_sieve_rename_init;
+	ctx->ctx.v.run = cmd_sieve_rename_run;
+	return &ctx->ctx.ctx;
+}
+
+struct doveadm_cmd_ver2 doveadm_sieve_cmd_rename = {
+	.name = "sieve rename",
+	.mail_cmd = cmd_sieve_rename_alloc,
+	.usage = DOVEADM_CMD_MAIL_USAGE_PREFIX"<oldname> <newname>",
+DOVEADM_CMD_PARAMS_START
+DOVEADM_CMD_MAIL_COMMON
+DOVEADM_CMD_PARAM('\0',"oldname",CMD_PARAM_STR,CMD_PARAM_FLAG_POSITIONAL)
+DOVEADM_CMD_PARAM('\0',"newname",CMD_PARAM_STR,CMD_PARAM_FLAG_POSITIONAL)
+DOVEADM_CMD_PARAMS_END
+};
diff --git a/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd.c b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd.c
new file mode 100644
index 0000000..eb9318c
--- /dev/null
+++ b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd.c
@@ -0,0 +1,179 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "unichar.h"
+#include "mail-storage.h"
+#include "doveadm-mail.h"
+
+#include "sieve.h"
+#include "sieve-script.h"
+#include "sieve-storage.h"
+
+#include "doveadm-sieve-cmd.h"
+
+void doveadm_sieve_cmd_failed_error
+(struct doveadm_sieve_cmd_context *ctx, enum sieve_error error)
+{
+	struct doveadm_mail_cmd_context *mctx = &ctx->ctx;
+	int exit_code = 0;
+
+	switch ( error ) {
+	case SIEVE_ERROR_NONE:
+		i_unreached();
+		return;
+	case SIEVE_ERROR_TEMP_FAILURE:
+		exit_code = EX_TEMPFAIL;
+		break;
+	case SIEVE_ERROR_NOT_POSSIBLE:
+	case SIEVE_ERROR_EXISTS:
+	case SIEVE_ERROR_NOT_VALID:
+	case SIEVE_ERROR_ACTIVE:
+		exit_code = DOVEADM_EX_NOTPOSSIBLE;
+		break;
+	case SIEVE_ERROR_BAD_PARAMS:
+		exit_code = EX_USAGE;
+		break;
+	case SIEVE_ERROR_NO_PERMISSION:
+		exit_code = EX_NOPERM;
+		break;
+	case SIEVE_ERROR_NO_QUOTA:
+		exit_code = EX_CANTCREAT;
+		break;
+	case SIEVE_ERROR_NOT_FOUND:
+		exit_code = DOVEADM_EX_NOTFOUND;
+		break;
+	default:
+		i_unreached();
+	}
+	/* tempfail overrides all other exit codes, otherwise use whatever
+	   error happened first */
+	if ( mctx->exit_code == 0 || exit_code == EX_TEMPFAIL )
+		mctx->exit_code = exit_code;
+}
+
+void doveadm_sieve_cmd_failed_storage
+(struct doveadm_sieve_cmd_context *ctx,	 struct sieve_storage *storage)
+{
+	enum sieve_error error;
+
+	(void)sieve_storage_get_last_error(storage, &error);
+	doveadm_sieve_cmd_failed_error(ctx, error);
+}
+
+static const char *doveadm_sieve_cmd_get_setting
+(void *context, const char *identifier)
+{
+	struct doveadm_sieve_cmd_context *ctx =
+		(struct doveadm_sieve_cmd_context *) context;
+
+	return mail_user_plugin_getenv(ctx->ctx.cur_mail_user, identifier);
+}
+
+static const struct sieve_callbacks sieve_callbacks = {
+	NULL,
+	doveadm_sieve_cmd_get_setting
+};
+
+static bool doveadm_sieve_cmd_parse_arg
+(struct doveadm_mail_cmd_context *_ctx ATTR_UNUSED,
+	int c ATTR_UNUSED)
+{
+	return FALSE;
+}
+
+void doveadm_sieve_cmd_scriptnames_check(const char *const args[])
+{
+	unsigned int i;
+
+	for (i = 0; args[i] != NULL; i++) {
+		if (!uni_utf8_str_is_valid(args[i])) {
+			i_fatal_status(EX_DATAERR,
+				"Sieve script name not valid UTF-8: %s", args[i]);
+		}
+		if ( !sieve_script_name_is_valid(args[i]) ) {
+			i_fatal_status(EX_DATAERR,
+				"Sieve script name not valid: %s", args[i]);
+		}
+	}
+}
+
+static int
+doveadm_sieve_cmd_run
+(struct doveadm_mail_cmd_context *_ctx,
+	struct mail_user *user)
+{
+	struct doveadm_sieve_cmd_context *ctx =
+		(struct doveadm_sieve_cmd_context *)_ctx;
+	struct sieve_environment svenv;
+	enum sieve_error error;
+	int ret;
+
+	memset((void*)&svenv, 0, sizeof(svenv));
+	svenv.username = user->username;
+	(void)mail_user_get_home(user, &svenv.home_dir);
+	svenv.base_dir = user->set->base_dir;
+	svenv.flags = SIEVE_FLAG_HOME_RELATIVE;
+
+	ctx->svinst = sieve_init
+		(&svenv, &sieve_callbacks, (void *)ctx, user->mail_debug);
+
+	ctx->storage = sieve_storage_create_main
+		(ctx->svinst, user, SIEVE_STORAGE_FLAG_READWRITE, &error);
+	if ( ctx->storage == NULL ) {
+		switch ( error ) {
+		case SIEVE_ERROR_NOT_POSSIBLE:
+			error = SIEVE_ERROR_NOT_FOUND;
+			i_error("Failed to open Sieve storage: "
+				"Sieve is disabled for this user");
+			break;
+		case SIEVE_ERROR_NOT_FOUND:
+			i_error("Failed to open Sieve storage: "
+				"User cannot manage personal Sieve scripts.");
+			break;
+		default:
+			i_error("Failed to open Sieve storage.");
+		}
+		doveadm_sieve_cmd_failed_error(ctx, error);
+		ret =  -1;
+
+	} else {
+		i_assert( ctx->v.run != NULL );
+		ret = ctx->v.run(ctx);
+		sieve_storage_unref(&ctx->storage);
+	}
+
+	sieve_deinit(&ctx->svinst);
+	return ret;
+}
+
+struct doveadm_sieve_cmd_context *
+doveadm_sieve_cmd_alloc_size(size_t size)
+{
+	struct doveadm_sieve_cmd_context *ctx;
+
+	ctx = (struct doveadm_sieve_cmd_context *)
+		doveadm_mail_cmd_alloc_size(size);
+	ctx->ctx.getopt_args = "s";
+	ctx->ctx.v.parse_arg = doveadm_sieve_cmd_parse_arg;
+	ctx->ctx.v.run = doveadm_sieve_cmd_run;
+	return ctx;
+}
+
+static struct doveadm_cmd_ver2 *doveadm_sieve_commands[] = {
+	&doveadm_sieve_cmd_list,
+	&doveadm_sieve_cmd_get,
+	&doveadm_sieve_cmd_put,
+	&doveadm_sieve_cmd_delete,
+	&doveadm_sieve_cmd_activate,
+	&doveadm_sieve_cmd_deactivate,
+	&doveadm_sieve_cmd_rename
+};
+
+void doveadm_sieve_cmds_init(void)
+{
+	unsigned int i;
+
+	for (i = 0; i < N_ELEMENTS(doveadm_sieve_commands); i++)
+		doveadm_cmd_register_ver2(doveadm_sieve_commands[i]);
+}
diff --git a/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd.h b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd.h
new file mode 100644
index 0000000..1296701
--- /dev/null
+++ b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-cmd.h
@@ -0,0 +1,43 @@
+#ifndef DOVEADM_SIEVE_CMD_H
+#define DOVEADM_SIEVE_CMD_H
+
+struct doveadm_sieve_cmd_context;
+
+struct doveadm_sieve_cmd_vfuncs {
+	/* This is the main function which performs all the work for the
+	   command. This is called once per each user. */
+	int (*run)(struct doveadm_sieve_cmd_context *ctx);
+};
+
+struct doveadm_sieve_cmd_context {
+	struct doveadm_mail_cmd_context ctx;
+
+	struct sieve_instance *svinst;
+	struct sieve_storage *storage;
+
+	struct doveadm_sieve_cmd_vfuncs v;
+};
+
+void doveadm_sieve_cmd_failed_error
+(struct doveadm_sieve_cmd_context *ctx, enum sieve_error error);
+void doveadm_sieve_cmd_failed_storage
+(struct doveadm_sieve_cmd_context *ctx,	 struct sieve_storage *storage);
+
+#define doveadm_sieve_cmd_alloc(type) \
+	(type *)doveadm_sieve_cmd_alloc_size(sizeof(type))
+struct doveadm_sieve_cmd_context *
+doveadm_sieve_cmd_alloc_size(size_t size);
+
+void doveadm_sieve_cmd_scriptnames_check(const char *const args[]);
+
+extern struct doveadm_cmd_ver2 doveadm_sieve_cmd_list;
+extern struct doveadm_cmd_ver2 doveadm_sieve_cmd_get;
+extern struct doveadm_cmd_ver2 doveadm_sieve_cmd_put;
+extern struct doveadm_cmd_ver2 doveadm_sieve_cmd_delete;
+extern struct doveadm_cmd_ver2 doveadm_sieve_cmd_activate;
+extern struct doveadm_cmd_ver2 doveadm_sieve_cmd_deactivate;
+extern struct doveadm_cmd_ver2 doveadm_sieve_cmd_rename;
+
+void doveadm_sieve_cmds_init(void);
+
+#endif
diff --git a/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-plugin.c b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-plugin.c
new file mode 100644
index 0000000..0478b55
--- /dev/null
+++ b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-plugin.c
@@ -0,0 +1,24 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "doveadm-mail.h"
+
+#include "sieve.h"
+
+#include "doveadm-sieve-cmd.h"
+#include "doveadm-sieve-plugin.h"
+
+const char *doveadm_sieve_plugin_version = DOVECOT_ABI_VERSION;
+
+void doveadm_sieve_plugin_init(struct module *module)
+{
+	doveadm_sieve_sync_init(module);
+	doveadm_sieve_cmds_init();
+}
+
+void doveadm_sieve_plugin_deinit(void)
+{
+	/* the hooks array is freed already */
+	/*mail_storage_hooks_remove(&doveadm_sieve_mail_storage_hooks);*/
+}
diff --git a/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-plugin.h b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-plugin.h
new file mode 100644
index 0000000..6e9446d
--- /dev/null
+++ b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-plugin.h
@@ -0,0 +1,17 @@
+#ifndef DOVEADM_SIEVE_PLUGIN_H
+#define DOVEADM_SIEVE_PLUGIN_H
+
+/*
+ * Plugin interface
+ */
+
+void doveadm_sieve_plugin_init(struct module *module);
+void doveadm_sieve_plugin_deinit(void);
+
+/*
+ * Replication
+ */
+
+void doveadm_sieve_sync_init(struct module *module);
+
+#endif
diff --git a/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-sync.c b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-sync.c
new file mode 100644
index 0000000..c85a3fc
--- /dev/null
+++ b/pigeonhole/src/plugins/doveadm-sieve/doveadm-sieve-sync.c
@@ -0,0 +1,746 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "ioloop.h"
+#include "time-util.h"
+#include "istream.h"
+#include "istream-concat.h"
+#include "mail-storage-private.h"
+
+#include "sieve.h"
+#include "sieve-script.h"
+#include "sieve-storage.h"
+
+#include "doveadm-sieve-plugin.h"
+
+#define SIEVE_MAIL_CONTEXT(obj) \
+	MODULE_CONTEXT_REQUIRE(obj, sieve_storage_module)
+#define SIEVE_USER_CONTEXT(obj) \
+	MODULE_CONTEXT_REQUIRE(obj, sieve_user_module)
+
+struct sieve_mail_user {
+	union mail_user_module_context module_ctx;
+
+	struct sieve_instance *svinst;
+	struct sieve_storage *sieve_storage;
+};
+
+struct sieve_mailbox_attribute_iter {
+	struct mailbox_attribute_iter iter;
+	struct mailbox_attribute_iter *super;
+
+	struct sieve_storage_list_context *sieve_list;
+	string_t *name;
+
+	bool failed;
+	bool have_active;
+};
+
+static MODULE_CONTEXT_DEFINE_INIT(sieve_storage_module,
+				  &mail_storage_module_register);
+static MODULE_CONTEXT_DEFINE_INIT(sieve_user_module,
+				  &mail_user_module_register);
+
+static const char *
+mail_sieve_get_setting(void *context, const char *identifier)
+{
+	struct mail_user *mail_user = context;
+
+	return mail_user_plugin_getenv(mail_user, identifier);
+}
+
+static const struct sieve_callbacks mail_sieve_callbacks = {
+	NULL,
+	mail_sieve_get_setting
+};
+
+static void mail_sieve_user_deinit(struct mail_user *user)
+{
+	struct sieve_mail_user *suser = SIEVE_USER_CONTEXT(user);
+
+	if ( suser->svinst != NULL ) {
+		if (suser->sieve_storage != NULL)
+			sieve_storage_unref(&suser->sieve_storage);
+		sieve_deinit(&suser->svinst);
+	}
+
+	suser->module_ctx.super.deinit(user);
+}
+
+static int
+mail_sieve_user_init
+(struct mail_user *user, struct sieve_storage **svstorage_r)
+{
+	struct sieve_mail_user *suser = SIEVE_USER_CONTEXT(user);
+	enum sieve_storage_flags storage_flags =
+		SIEVE_STORAGE_FLAG_READWRITE |
+		SIEVE_STORAGE_FLAG_SYNCHRONIZING;
+	struct sieve_environment svenv;
+
+	if ( suser->svinst != NULL ) {
+		*svstorage_r = suser->sieve_storage;
+		return suser->sieve_storage != NULL ? 1 : 0;
+	}
+
+	/* Delayed initialization of sieve storage until it's actually needed */
+	i_zero(&svenv);
+	svenv.username = user->username;
+	(void)mail_user_get_home(user, &svenv.home_dir);
+	svenv.base_dir = user->set->base_dir;
+	svenv.flags = SIEVE_FLAG_HOME_RELATIVE;
+
+	suser->svinst = sieve_init(&svenv, &mail_sieve_callbacks,
+				   user, user->mail_debug);
+	suser->sieve_storage = sieve_storage_create_main
+			(suser->svinst, user, storage_flags, NULL);
+
+	*svstorage_r = suser->sieve_storage;
+	return suser->sieve_storage != NULL ? 1 : 0;
+}
+
+static int sieve_attribute_unset_script(struct mail_storage *storage,
+					struct sieve_storage *svstorage,
+					const char *scriptname)
+{
+	struct sieve_script *script;
+	const char *errstr;
+	enum sieve_error error;
+	int ret = 0;
+
+	script = sieve_storage_open_script(svstorage, scriptname, NULL);
+	if (script == NULL) { 
+		ret = -1;
+	} else {
+		ret = sieve_script_delete(script, TRUE);
+		sieve_script_unref(&script);
+	}
+
+	if (ret < 0) {
+		errstr = sieve_storage_get_last_error(svstorage, &error);
+		if (error == SIEVE_ERROR_NOT_FOUND) {
+			/* already deleted, ignore */
+			return 0;
+		}
+		mail_storage_set_critical(storage,
+			"Failed to delete Sieve script '%s': %s", scriptname,
+			errstr);
+		return -1;
+	}
+	return 0;
+}
+
+static int
+sieve_attribute_set_active(struct mail_storage *storage,
+			   struct sieve_storage *svstorage,
+			   const struct mail_attribute_value *value)
+{
+	const char *scriptname;
+	struct sieve_script *script;
+	time_t last_change =
+		(value->last_change == 0 ? ioloop_time : value->last_change);
+	int ret;
+
+	if (mailbox_attribute_value_to_string(storage, value, &scriptname) < 0)
+		return -1;
+
+	if (scriptname == NULL) {
+		/* don't affect non-link active script */
+		if ((ret=sieve_storage_is_singular(svstorage)) != 0) {
+			if (ret < 0) {
+				mail_storage_set_internal_error(storage);
+				return -1;
+			}
+			return 0;
+		}
+
+		/* deactivate current script */
+		if (sieve_storage_deactivate(svstorage, last_change) < 0) {
+			mail_storage_set_critical(storage,
+				"Failed to deactivate Sieve: %s",
+				sieve_storage_get_last_error(svstorage, NULL));
+			return -1;
+		}
+		return 0;
+	}
+	i_assert(scriptname[0] == MAILBOX_ATTRIBUTE_SIEVE_DEFAULT_LINK);
+	scriptname++;
+
+	/* activate specified script */
+	script = sieve_storage_open_script(svstorage, scriptname, NULL);
+	ret = script == NULL ? -1 :
+		sieve_script_activate(script, last_change);
+	if (ret < 0) {
+		mail_storage_set_critical(storage,
+			"Failed to activate Sieve script '%s': %s", scriptname,
+			sieve_storage_get_last_error(svstorage, NULL));
+	}
+	if (script != NULL)
+		sieve_script_unref(&script);
+	sieve_storage_set_modified(svstorage, last_change);
+	return ret;
+}
+
+static int
+sieve_attribute_unset_active_script(struct mail_storage *storage,
+			   struct sieve_storage *svstorage, time_t last_change)
+{
+	int ret;
+
+	if ((ret=sieve_storage_is_singular(svstorage)) != 0) {
+		if (ret < 0)
+			mail_storage_set_internal_error(storage);
+		return ret;
+	}
+
+	if (sieve_storage_deactivate(svstorage, last_change) < 0) {
+		mail_storage_set_critical(storage,
+			"Failed to deactivate sieve: %s",
+			sieve_storage_get_last_error(svstorage, NULL));
+		return -1;
+	}
+	return 0;
+}
+
+static int
+sieve_attribute_set_active_script(struct mail_storage *storage,
+			   struct sieve_storage *svstorage,
+			   const struct mail_attribute_value *value)
+{
+	struct istream *input;
+	time_t last_change =
+		(value->last_change == 0 ? ioloop_time : value->last_change);
+
+	if (value->value != NULL) {
+		input = i_stream_create_from_data(value->value, strlen(value->value));
+	} else if (value->value_stream != NULL) {
+		input = value->value_stream;
+		i_stream_ref(input);
+	} else {
+		return sieve_attribute_unset_active_script
+			(storage, svstorage, last_change);
+	}
+	/* skip over the 'S' type */
+	i_stream_skip(input, 1);
+
+	if (sieve_storage_save_as_active
+		(svstorage, input, last_change) < 0) {
+		mail_storage_set_critical(storage,
+			"Failed to save active sieve script: %s",
+			sieve_storage_get_last_error(svstorage, NULL));
+		i_stream_unref(&input);
+		return -1;
+	}
+
+	sieve_storage_set_modified(svstorage, last_change);
+	i_stream_unref(&input);
+	return 0;
+}
+
+static int
+sieve_attribute_set_default(struct mail_storage *storage,
+			    struct sieve_storage *svstorage,
+			    const struct mail_attribute_value *value)
+{
+	const unsigned char *data;
+	size_t size;
+	ssize_t ret;
+	char type;
+
+	if (value->value != NULL) {
+		type = value->value[0];
+	} else if (value->value_stream != NULL) {
+		ret = i_stream_read_more(value->value_stream, &data, &size);
+		if (ret == -1) {
+			mail_storage_set_critical(storage, "read(%s) failed: %m",
+				i_stream_get_name(value->value_stream));
+			return -1;
+		}
+		i_assert(ret > 0);
+		type = data[0];
+	} else {
+		type = MAILBOX_ATTRIBUTE_SIEVE_DEFAULT_SCRIPT;
+	}
+	if (type == MAILBOX_ATTRIBUTE_SIEVE_DEFAULT_LINK)
+		return sieve_attribute_set_active(storage, svstorage, value);
+	if (type == MAILBOX_ATTRIBUTE_SIEVE_DEFAULT_SCRIPT)
+		return sieve_attribute_set_active_script(storage, svstorage, value);
+	mail_storage_set_error(storage, MAIL_ERROR_PARAMS,
+			       "Invalid value for default sieve attribute");
+	return -1;
+}
+
+static int
+sieve_attribute_set_sieve(struct mail_storage *storage,
+			  const char *key,
+			  const struct mail_attribute_value *value)
+{
+	struct sieve_storage *svstorage;
+	struct sieve_storage_save_context *save_ctx;
+	struct istream *input;
+	const char *scriptname;
+	int ret;
+
+	if ((ret = mail_sieve_user_init(storage->user, &svstorage)) <= 0) {
+		if (ret == 0) {
+			mail_storage_set_error(storage, MAIL_ERROR_NOTFOUND,
+					       "Sieve not enabled for user");
+		}
+		return -1;
+	}
+
+	if (strcmp(key, MAILBOX_ATTRIBUTE_SIEVE_DEFAULT) == 0)
+		return sieve_attribute_set_default(storage, svstorage, value);
+	if (!str_begins(key, MAILBOX_ATTRIBUTE_PREFIX_SIEVE_FILES)) {
+		mail_storage_set_error(storage, MAIL_ERROR_NOTFOUND,
+				       "Nonexistent sieve attribute");
+		return -1;
+	}
+	scriptname = key + strlen(MAILBOX_ATTRIBUTE_PREFIX_SIEVE_FILES);
+
+	if (value->value != NULL) {
+		input = i_stream_create_from_data(value->value,
+						  strlen(value->value));
+		save_ctx = sieve_storage_save_init(svstorage, scriptname, input);
+	} else if (value->value_stream != NULL) {
+		input = value->value_stream;
+		i_stream_ref(input);
+		save_ctx = sieve_storage_save_init(svstorage, scriptname, input);
+	} else {
+		return sieve_attribute_unset_script(storage, svstorage, scriptname);
+	}
+
+	if (save_ctx == NULL) {
+		/* save initialization failed */
+		mail_storage_set_critical(storage,
+			"Failed to save sieve script '%s': %s", scriptname,
+			sieve_storage_get_last_error(svstorage, NULL));
+		i_stream_unref(&input);
+		return -1;
+	}
+
+	if (value->last_change != 0)
+		sieve_storage_save_set_mtime(save_ctx, value->last_change);
+
+	ret = 0;
+	while (input->stream_errno == 0 &&
+		!i_stream_read_eof(input)) {
+		if (sieve_storage_save_continue(save_ctx) < 0) {
+			mail_storage_set_critical(storage,
+				"Failed to save sieve script '%s': %s", scriptname,
+				sieve_storage_get_last_error(svstorage, NULL));
+			ret = -1;
+			break;
+		}
+	}
+	if (input->stream_errno != 0) {
+		errno = input->stream_errno;
+		mail_storage_set_critical(storage,
+			"Saving sieve script: read(%s) failed: %m",
+			i_stream_get_name(input));
+		ret = -1;
+	}
+	i_assert(input->eof || ret < 0);
+	if (ret == 0 && sieve_storage_save_finish(save_ctx) < 0) {
+		mail_storage_set_critical(storage,
+			"Failed to save sieve script '%s': %s", scriptname,
+			sieve_storage_get_last_error(svstorage, NULL));
+		ret = -1;
+	}
+	if (ret < 0)
+		sieve_storage_save_cancel(&save_ctx);
+	else if (sieve_storage_save_commit(&save_ctx) < 0) {
+		mail_storage_set_critical(storage,
+			"Failed to save sieve script '%s': %s", scriptname,
+			sieve_storage_get_last_error(svstorage, NULL));
+		ret = -1;
+	}
+	i_stream_unref(&input);
+	return ret;
+}
+
+static int
+sieve_attribute_set(struct mailbox_transaction_context *t,
+		    enum mail_attribute_type type, const char *key,
+		    const struct mail_attribute_value *value)
+{
+	struct mail_user *user = t->box->storage->user;
+	union mailbox_module_context *sbox = SIEVE_MAIL_CONTEXT(t->box);
+
+	if (t->box->storage->user->dsyncing &&
+	    type == MAIL_ATTRIBUTE_TYPE_PRIVATE &&
+	    str_begins(key, MAILBOX_ATTRIBUTE_PREFIX_SIEVE)) {
+		time_t ts =
+			(value->last_change != 0 ? value->last_change : ioloop_time);
+
+		if (sieve_attribute_set_sieve(t->box->storage, key, value) < 0)
+			return -1;
+
+		if (user->mail_debug) {
+			const char *change;
+			if (value->last_change != 0) {
+				change = t_strflocaltime
+					("(last change: %Y-%m-%d %H:%M:%S)", value->last_change);
+			} else {
+				change = t_strflocaltime
+					("(time: %Y-%m-%d %H:%M:%S)", ioloop_time);
+			}
+			i_debug("doveadm-sieve: Assigned value for key `%s' %s",
+				key, change);
+		}
+
+		/* FIXME: set value len to sieve script size / active name
+		   length */
+		if (value->value != NULL || value->value_stream != NULL)
+			mail_index_attribute_set(t->itrans, TRUE, key, ts, 0);
+		else
+			mail_index_attribute_unset(t->itrans, TRUE, key, ts);
+		return 0;
+	}
+	return sbox->super.attribute_set(t, type, key, value);
+}
+
+static int
+sieve_attribute_retrieve_script(struct mail_storage *storage,
+			   struct sieve_storage *svstorage, struct sieve_script *script,
+			   bool add_type_prefix,
+			   struct mail_attribute_value *value_r, const char **errorstr_r)
+{
+	static char type = MAILBOX_ATTRIBUTE_SIEVE_DEFAULT_SCRIPT;
+	struct istream *input, *inputs[3];
+	const struct stat *st;
+	enum sieve_error error;
+
+	if (script == NULL)
+		*errorstr_r = sieve_storage_get_last_error(svstorage, &error);
+	else if (sieve_script_get_stream(script, &input, &error) < 0)
+		sieve_script_unref(&script);
+	
+	if (script == NULL) {
+		if (error == SIEVE_ERROR_NOT_FOUND) {
+			/* already deleted, but return the last_change */
+			(void)sieve_storage_get_last_change(svstorage,
+							    &value_r->last_change);
+			return 0;
+		}
+		*errorstr_r = sieve_storage_get_last_error(svstorage, &error);
+		return -1;
+	}
+	if (i_stream_stat(input, FALSE, &st) < 0) {
+		mail_storage_set_critical(storage,
+			"stat(%s) failed: %m", i_stream_get_name(input));
+	} else {
+		value_r->last_change = st->st_mtime;
+	}
+	if (!add_type_prefix) {
+		i_stream_ref(input);
+		value_r->value_stream = input;
+	} else {
+		inputs[0] = i_stream_create_from_data(&type, 1);
+		inputs[1] = input;
+		inputs[2] = NULL;
+		value_r->value_stream = i_stream_create_concat(inputs);
+		i_stream_unref(&inputs[0]);
+	}
+	sieve_script_unref(&script);
+	return 1;
+}
+
+static int
+sieve_attribute_get_active_script(struct mail_storage *storage,
+			   struct sieve_storage *svstorage,
+			   struct mail_attribute_value *value_r)
+{
+	struct sieve_script *script;
+	const char *errstr;
+	int ret;
+
+	if ((ret=sieve_storage_is_singular(svstorage)) <= 0) {
+		if (ret == 0 && sieve_storage_active_script_get_last_change
+			(svstorage, &value_r->last_change) < 0) {
+			ret = -1;
+		}
+		if (ret < 0)
+			mail_storage_set_internal_error(storage);
+		return ret;
+	}
+
+	if ((script=sieve_storage_active_script_open
+		(svstorage, NULL)) == NULL)
+		return 0;
+
+	if ((ret=sieve_attribute_retrieve_script
+		(storage, svstorage, script, TRUE, value_r, &errstr)) < 0) {
+		mail_storage_set_critical(storage,
+			"Failed to access active sieve script: %s", errstr);
+	}
+	return ret;
+}
+
+static int
+sieve_attribute_get_default(struct mail_storage *storage,
+			    struct sieve_storage *svstorage,
+			    struct mail_attribute_value *value_r)
+{
+	const char *scriptname;
+	int ret;
+
+	ret = sieve_storage_active_script_get_name(svstorage, &scriptname);
+	if (ret == 0)
+		return sieve_attribute_get_active_script(storage, svstorage, value_r);
+
+	if (ret > 0) {
+		value_r->value = t_strdup_printf("%c%s",
+			MAILBOX_ATTRIBUTE_SIEVE_DEFAULT_LINK, scriptname);
+		if (sieve_storage_active_script_get_last_change
+				(svstorage, &value_r->last_change) < 0)
+			ret = -1;
+	}
+	if (ret < 0)
+		mail_storage_set_internal_error(storage);
+	return ret;
+}
+
+static int
+sieve_attribute_get_sieve(struct mail_storage *storage, const char *key,
+			  struct mail_attribute_value *value_r)
+{
+	struct sieve_storage *svstorage;
+	struct sieve_script *script;
+	const char *scriptname, *errstr;
+	int ret;
+
+	if ((ret = mail_sieve_user_init(storage->user, &svstorage)) <= 0)
+		return ret;
+
+	if (strcmp(key, MAILBOX_ATTRIBUTE_SIEVE_DEFAULT) == 0)
+		return sieve_attribute_get_default(storage, svstorage, value_r);
+	if (!str_begins(key, MAILBOX_ATTRIBUTE_PREFIX_SIEVE_FILES))
+		return 0;
+	if ((value_r->flags & MAIL_ATTRIBUTE_VALUE_FLAG_INT_STREAMS) == 0) {
+		mail_storage_set_error(storage, MAIL_ERROR_PARAMS,
+			"Sieve attributes are available only as streams");
+		return -1;
+	}
+	scriptname = key + strlen(MAILBOX_ATTRIBUTE_PREFIX_SIEVE_FILES);
+	script = sieve_storage_open_script(svstorage, scriptname, NULL);
+	if ((ret=sieve_attribute_retrieve_script
+		(storage, svstorage, script, FALSE, value_r, &errstr)) < 0) {
+		mail_storage_set_critical(storage,
+			"Failed to access sieve script '%s': %s",
+			scriptname, errstr);
+	}
+	return ret;
+}
+
+static int
+sieve_attribute_get(struct mailbox *box,
+		    enum mail_attribute_type type, const char *key,
+		    struct mail_attribute_value *value_r)
+{
+	union mailbox_module_context *sbox = SIEVE_MAIL_CONTEXT(box);
+	struct mail_user *user = box->storage->user;
+	int ret;
+
+	if (box->storage->user->dsyncing &&
+	    type == MAIL_ATTRIBUTE_TYPE_PRIVATE &&
+	    str_begins(key, MAILBOX_ATTRIBUTE_PREFIX_SIEVE)) {
+
+		ret = sieve_attribute_get_sieve(box->storage, key, value_r);
+		if (ret >= 0 && user->mail_debug) {
+			struct tm *tm = localtime(&value_r->last_change);
+			char str[256];
+			const char *timestamp = "";
+	
+			if (strftime(str, sizeof(str),
+				" (last change: %Y-%m-%d %H:%M:%S)", tm) > 0)
+				timestamp = str;
+
+			if (ret > 0) {
+				i_debug("doveadm-sieve: Retrieved value for key `%s'%s",
+					key, timestamp);
+			} else {
+				i_debug("doveadm-sieve: Value missing for key `%s'%s",
+					key, timestamp);
+			}
+		}
+		return ret;
+	}
+	return sbox->super.attribute_get(box, type, key, value_r);
+}
+
+static int
+sieve_attribute_iter_script_init(struct sieve_mailbox_attribute_iter *siter)
+{
+	struct mail_user *user = siter->iter.box->storage->user;
+	struct sieve_storage *svstorage;
+	int ret;
+
+	if (user->mail_debug)
+		i_debug("doveadm-sieve: Iterating Sieve mailbox attributes");
+
+	if ((ret = mail_sieve_user_init(user, &svstorage)) <= 0)
+		return ret;
+
+	siter->sieve_list = sieve_storage_list_init(svstorage);
+	if (siter->sieve_list == NULL) {
+		mail_storage_set_critical(siter->iter.box->storage,
+			"Failed to iterate sieve scripts: %s",
+			sieve_storage_get_last_error(svstorage, NULL));
+		return -1;
+	}
+	siter->name = str_new(default_pool, 128);
+	str_append(siter->name, MAILBOX_ATTRIBUTE_PREFIX_SIEVE_FILES);
+	return 0;
+}
+
+static struct mailbox_attribute_iter *
+sieve_attribute_iter_init(struct mailbox *box, enum mail_attribute_type type,
+			  const char *prefix)
+{
+	union mailbox_module_context *sbox = SIEVE_MAIL_CONTEXT(box);
+	struct sieve_mailbox_attribute_iter *siter;
+
+	siter = i_new(struct sieve_mailbox_attribute_iter, 1);
+	siter->iter.box = box;
+	siter->super = sbox->super.attribute_iter_init(box, type, prefix);
+
+	if (box->storage->user->dsyncing &&
+	    type == MAIL_ATTRIBUTE_TYPE_PRIVATE) {
+		if (sieve_attribute_iter_script_init(siter) < 0)
+			siter->failed = TRUE;
+	}
+	return &siter->iter;
+}
+
+static const char *
+sieve_attribute_iter_next_script(struct sieve_mailbox_attribute_iter *siter)
+{
+	struct mail_user *user = siter->iter.box->storage->user;
+	struct sieve_mail_user *suser = SIEVE_USER_CONTEXT(user);
+	struct sieve_storage *svstorage = suser->sieve_storage;
+	const char *scriptname;
+	bool active;
+	int ret;
+
+	if (siter->sieve_list == NULL)
+		return NULL;
+
+	/* Iterate through all scripts in sieve_dir */
+	while ((scriptname = sieve_storage_list_next(siter->sieve_list, &active))
+		!= NULL) {
+		if (active)
+			siter->have_active = TRUE;
+		str_truncate(siter->name, strlen(MAILBOX_ATTRIBUTE_PREFIX_SIEVE_FILES));
+		str_append(siter->name, scriptname);
+		return str_c(siter->name);
+	}
+	if (sieve_storage_list_deinit(&siter->sieve_list) < 0) {
+		mail_storage_set_critical(siter->iter.box->storage,
+			"Failed to iterate sieve scripts: %s",
+			sieve_storage_get_last_error(svstorage, NULL));
+		siter->failed = TRUE;
+		return NULL;
+	}
+
+	/* Check whether active script is a proper symlink or a regular file */
+	if ((ret=sieve_storage_is_singular(svstorage)) < 0) {
+		mail_storage_set_critical(siter->iter.box->storage,
+			"Failed to iterate sieve scripts: %s",
+			sieve_storage_get_last_error(svstorage, NULL));
+		return NULL;
+	}
+
+	/* Regular file */
+	if (ret > 0)
+		return MAILBOX_ATTRIBUTE_SIEVE_DEFAULT;
+
+	/* Symlink or none active */
+	return siter->have_active ? MAILBOX_ATTRIBUTE_SIEVE_DEFAULT : NULL;
+}
+
+static const char *
+sieve_attribute_iter_next(struct mailbox_attribute_iter *iter)
+{
+	struct sieve_mailbox_attribute_iter *siter =
+		(struct sieve_mailbox_attribute_iter *)iter;
+	union mailbox_module_context *sbox = SIEVE_MAIL_CONTEXT(iter->box);
+	struct mail_user *user = iter->box->storage->user;
+	const char *key;
+
+	if (siter->sieve_list != NULL) {
+		if ((key = sieve_attribute_iter_next_script(siter)) != NULL) {
+			if (user->mail_debug) {
+				i_debug("doveadm-sieve: Iterating Sieve mailbox attribute: %s", key);
+			}
+			return key;
+		}
+	}
+	return sbox->super.attribute_iter_next(siter->super);
+}
+
+static int
+sieve_attribute_iter_deinit(struct mailbox_attribute_iter *iter)
+{
+	struct sieve_mailbox_attribute_iter *siter =
+		(struct sieve_mailbox_attribute_iter *)iter;
+	union mailbox_module_context *sbox = SIEVE_MAIL_CONTEXT(iter->box);
+	int ret = siter->failed ? -1 : 0;
+
+	if (siter->super != NULL) {
+		if (sbox->super.attribute_iter_deinit(siter->super) < 0)
+			ret = -1;
+	}
+	if (siter->sieve_list != NULL)
+		(void)sieve_storage_list_deinit(&siter->sieve_list);
+	if (siter->name != NULL)
+		str_free(&siter->name);
+	i_free(siter);
+	return ret;
+}
+
+static void
+sieve_mail_user_created(struct mail_user *user)
+{
+	struct sieve_mail_user *suser;
+	struct mail_user_vfuncs *v = user->vlast;
+
+	suser = p_new(user->pool, struct sieve_mail_user, 1);
+	suser->module_ctx.super = *v;
+	user->vlast = &suser->module_ctx.super;
+	v->deinit = mail_sieve_user_deinit;
+	MODULE_CONTEXT_SET(user, sieve_user_module, suser);
+}
+
+static void
+sieve_mailbox_allocated(struct mailbox *box)
+{
+	struct mailbox_vfuncs *v = box->vlast;
+	union mailbox_module_context *sbox;
+
+	/* attribute syncing is done via INBOX */
+	if (!box->inbox_user)
+		return;
+
+	sbox = p_new(box->pool, union mailbox_module_context, 1);
+	sbox->super = *v;
+	box->vlast = &sbox->super;
+	v->attribute_set = sieve_attribute_set;
+	v->attribute_get = sieve_attribute_get;
+	v->attribute_iter_init = sieve_attribute_iter_init;
+	v->attribute_iter_next = sieve_attribute_iter_next;
+	v->attribute_iter_deinit = sieve_attribute_iter_deinit;
+	MODULE_CONTEXT_SET_SELF(box, sieve_storage_module, sbox);
+}
+
+static struct mail_storage_hooks doveadm_sieve_mail_storage_hooks = {
+	.mail_user_created = sieve_mail_user_created,
+	.mailbox_allocated = sieve_mailbox_allocated
+};
+
+void doveadm_sieve_sync_init(struct module *module)
+{
+	mail_storage_hooks_add_forced
+		(module, &doveadm_sieve_mail_storage_hooks);
+}
diff --git a/pigeonhole/src/plugins/imap-filter-sieve/Makefile.am b/pigeonhole/src/plugins/imap-filter-sieve/Makefile.am
new file mode 100644
index 0000000..915e128
--- /dev/null
+++ b/pigeonhole/src/plugins/imap-filter-sieve/Makefile.am
@@ -0,0 +1,26 @@
+imap_moduledir = $(dovecot_moduledir)
+
+imap_module_LTLIBRARIES = lib95_imap_filter_sieve_plugin.la
+
+lib95_imap_filter_sieve_plugin_la_LDFLAGS = -module -avoid-version
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib-sieve \
+	$(LIBDOVECOT_IMAP_INCLUDE) \
+	$(LIBDOVECOT_LDA_INCLUDE) \
+	$(LIBDOVECOT_INCLUDE) \
+	-DPKG_RUNDIR=\""$(rundir)"\"
+
+lib95_imap_filter_sieve_plugin_la_SOURCES = \
+	cmd-filter.c \
+	cmd-filter-sieve.c \
+	imap-filter.c \
+	imap-filter-sieve.c \
+	imap-filter-sieve-plugin.c
+lib95_imap_filter_sieve_plugin_la_LIBADD = \
+	$(top_builddir)/src/lib-sieve/libdovecot-sieve.la
+
+noinst_HEADERS = \
+	imap-filter.h \
+	imap-filter-sieve.h \
+	imap-filter-sieve-plugin.h
diff --git a/pigeonhole/src/plugins/imap-filter-sieve/Makefile.in b/pigeonhole/src/plugins/imap-filter-sieve/Makefile.in
new file mode 100644
index 0000000..b74a15b
--- /dev/null
+++ b/pigeonhole/src/plugins/imap-filter-sieve/Makefile.in
@@ -0,0 +1,771 @@
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+	}
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+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f '$(DESTDIR)$(imap_moduledir)/$$f'"; \
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+	done
+
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+	-test -z "$(imap_module_LTLIBRARIES)" || rm -f $(imap_module_LTLIBRARIES)
+	@list='$(imap_module_LTLIBRARIES)'; \
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+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+lib95_imap_filter_sieve_plugin.la: $(lib95_imap_filter_sieve_plugin_la_OBJECTS) $(lib95_imap_filter_sieve_plugin_la_DEPENDENCIES) $(EXTRA_lib95_imap_filter_sieve_plugin_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(lib95_imap_filter_sieve_plugin_la_LINK) -rpath $(imap_moduledir) $(lib95_imap_filter_sieve_plugin_la_OBJECTS) $(lib95_imap_filter_sieve_plugin_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
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+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
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+	     $$unique
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+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
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+
+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
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+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
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+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
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+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
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+clean-am: clean-generic clean-imap_moduleLTLIBRARIES clean-libtool \
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+distclean: distclean-am
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+	-rm -f ./$(DEPDIR)/cmd-filter.Plo
+	-rm -f ./$(DEPDIR)/imap-filter-sieve-plugin.Plo
+	-rm -f ./$(DEPDIR)/imap-filter-sieve.Plo
+	-rm -f ./$(DEPDIR)/imap-filter.Plo
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+		-rm -f ./$(DEPDIR)/cmd-filter-sieve.Plo
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+	-rm -f ./$(DEPDIR)/imap-filter-sieve.Plo
+	-rm -f ./$(DEPDIR)/imap-filter.Plo
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+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-imap_moduleLTLIBRARIES clean-libtool \
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+	uninstall-am uninstall-imap_moduleLTLIBRARIES
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/plugins/imap-filter-sieve/cmd-filter-sieve.c b/pigeonhole/src/plugins/imap-filter-sieve/cmd-filter-sieve.c
new file mode 100644
index 0000000..6b96bd3
--- /dev/null
+++ b/pigeonhole/src/plugins/imap-filter-sieve/cmd-filter-sieve.c
@@ -0,0 +1,403 @@
+/* Copyright (c) 2017-2018 Pigeonhole authors, see the included COPYING file */
+
+#include "imap-common.h"
+#include "str.h"
+#include "istream.h"
+#include "istream-seekable.h"
+#include "ostream.h"
+#include "imap-commands.h"
+
+#include "imap-filter.h"
+#include "imap-filter-sieve.h"
+
+#define FILTER_MAX_INMEM_SIZE (1024*128)
+
+static int cmd_filter_sieve_compile_script(struct imap_filter_context *ctx)
+{
+	struct client_command_context *cmd = ctx->cmd;
+	struct imap_filter_sieve_context *sctx = ctx->sieve;
+	struct client *client = cmd->client;
+	string_t *errors = NULL;
+	bool have_warnings = FALSE;
+	int ret = 0;
+
+	ret = imap_filter_sieve_compile(sctx, &errors, &have_warnings);
+	if (ret >= 0 && !have_warnings)
+		return 0;
+		
+	o_stream_nsend_str(client->output,
+		t_strdup_printf("* FILTER (TAG %s) "
+				"%s {%zu}\r\n",
+				cmd->tag, (ret < 0 ? "ERRORS" : "WARNINGS"),
+				str_len(errors)));
+	o_stream_nsend(client->output,
+		       str_data(errors), str_len(errors));
+	o_stream_nsend_str(client->output, "\r\n");
+	
+	if (ret < 0) {
+		ctx->compile_failure = TRUE;
+		ctx->failed = TRUE;
+		return -1;
+	}
+	return 0;
+}
+
+static bool cmd_filter_sieve_delivery(struct client_command_context *cmd)
+{
+	struct imap_filter_context *ctx = cmd->context;
+	struct client *client = cmd->client;
+	struct imap_filter_sieve_context *sctx = ctx->sieve;
+	enum mail_error error;
+	const char *error_string;
+	int ret;
+
+	if (cmd->cancel) {
+		imap_filter_deinit(ctx);
+		return TRUE;
+	}
+
+	i_assert(sctx->filter_type == IMAP_FILTER_SIEVE_TYPE_DELIVERY);
+	ret = imap_filter_sieve_open_personal(sctx, NULL,
+					      &error, &error_string);
+	if (ret < 0) {
+		client_send_tagline(
+			cmd, imap_get_error_string(cmd, error_string, error));
+		imap_filter_deinit(ctx);
+		return TRUE;
+	}
+	if (cmd_filter_sieve_compile_script(ctx) < 0) {
+		client_send_tagline(cmd, "NO Failed to compile Sieve script");
+		client->input_skip_line = TRUE;
+		imap_filter_deinit(ctx);
+		return TRUE;
+	}
+
+	imap_parser_reset(ctx->parser);
+	cmd->func = imap_filter_search;
+	return imap_filter_search(cmd);
+}
+
+static int
+cmd_filter_sieve_script_parse_name_arg(struct imap_filter_context *ctx)
+{
+	struct client_command_context *cmd = ctx->cmd;
+	const struct imap_arg *args;
+	const char *error;
+	enum imap_parser_error parse_error;
+	int ret;
+
+	ret = imap_parser_read_args(ctx->parser, 1, 0, &args);
+	if (ret < 0) {
+		if (ret == -2)
+			return 0;
+		error = imap_parser_get_error(ctx->parser, &parse_error);
+		switch (parse_error) {
+		case IMAP_PARSE_ERROR_NONE:
+			i_unreached();
+		case IMAP_PARSE_ERROR_LITERAL_TOO_BIG:
+			client_disconnect_with_error(ctx->cmd->client, error);
+			break;
+		default:
+			client_send_command_error(ctx->cmd, error);
+			break;
+		}
+		return -1;
+	}
+
+	switch (args[0].type) {
+	case IMAP_ARG_EOL:
+		client_send_command_error(ctx->cmd, "Script name missing");
+		return -1;
+	case IMAP_ARG_NIL:
+	case IMAP_ARG_LIST:
+		client_send_command_error(
+			ctx->cmd, "Script name must be an atom or a string");
+		return -1;
+	case IMAP_ARG_ATOM:
+	case IMAP_ARG_STRING:
+		/* We have the value already */
+		if (ctx->failed)
+			return 1;
+		ctx->script_name = p_strdup(cmd->pool,
+					    imap_arg_as_astring(&args[0]));
+		break;
+	case IMAP_ARG_LITERAL:
+	case IMAP_ARG_LITERAL_SIZE:
+	case IMAP_ARG_LITERAL_SIZE_NONSYNC:
+		i_unreached();
+	}
+	return 1;
+}
+
+static bool
+cmd_filter_sieve_script_parse_name(struct client_command_context *cmd)
+{
+	struct imap_filter_context *ctx = cmd->context;
+	struct client *client = cmd->client;
+	struct imap_filter_sieve_context *sctx = ctx->sieve;
+	enum mail_error error;
+	const char *error_string;
+	int ret;
+
+	if (cmd->cancel) {
+		imap_filter_deinit(ctx);
+		return TRUE;
+	}
+
+	if ((ret = cmd_filter_sieve_script_parse_name_arg(ctx)) == 0)
+		return FALSE;
+	if (ret < 0) {
+		/* Already sent the error to client */
+		imap_filter_deinit(ctx);
+		return TRUE;
+	}
+
+	switch (sctx->filter_type) {
+	case IMAP_FILTER_SIEVE_TYPE_PERSONAL:
+		ret = imap_filter_sieve_open_personal(sctx, ctx->script_name,
+						      &error, &error_string);
+		break;
+	case IMAP_FILTER_SIEVE_TYPE_GLOBAL:
+		ret = imap_filter_sieve_open_global(sctx, ctx->script_name,
+						    &error, &error_string);
+		break;
+	case IMAP_FILTER_SIEVE_TYPE_DELIVERY:
+	case IMAP_FILTER_SIEVE_TYPE_SCRIPT:
+		i_unreached();
+	}
+	if (ret < 0) {
+		client_send_tagline(
+			cmd, imap_get_error_string(cmd, error_string, error));
+		imap_filter_deinit(ctx);
+		return TRUE;
+	}
+	if (cmd_filter_sieve_compile_script(ctx) < 0) {
+		client_send_tagline(cmd, "NO Failed to compile Sieve script");
+		client->input_skip_line = TRUE;
+		imap_filter_deinit(ctx);
+		return TRUE;
+	}
+
+	imap_parser_reset(ctx->parser);
+	cmd->func = imap_filter_search;
+	return imap_filter_search(cmd);
+}
+
+static void
+cmd_filter_sieve_compile_input(struct imap_filter_context *ctx,
+				struct istream *input)
+{
+	struct imap_filter_sieve_context *sctx = ctx->sieve;
+
+	imap_filter_sieve_open_input(sctx, input);
+	(void)cmd_filter_sieve_compile_script(ctx);
+}
+
+static int cmd_filter_sieve_script_read_stream(struct imap_filter_context *ctx)
+{
+	struct istream *input = ctx->script_input;
+	const unsigned char *data;
+	size_t size;
+	int ret;
+
+	while ((ret = i_stream_read_more(input, &data, &size)) > 0)
+		i_stream_skip(input, size);
+	if (ret == 0)
+		return 0;
+
+	if (input->v_offset != ctx->script_len) {
+		/* Client disconnected */
+		i_assert(input->eof);
+		return -1;
+	}
+	/* Finished reading the value */
+	i_stream_seek(input, 0);
+
+	if (ctx->failed) {
+		i_stream_unref(&ctx->script_input);
+		return 1;
+	}
+
+	cmd_filter_sieve_compile_input(ctx, ctx->script_input);
+	i_stream_unref(&ctx->script_input);
+	return 1;
+}
+
+static int
+cmd_filter_sieve_script_parse_value_arg(struct imap_filter_context *ctx)
+{
+	const struct imap_arg *args;
+	const char *value, *error;
+	enum imap_parser_error parse_error;
+	struct istream *input, *inputs[2];
+	string_t *path;
+	int ret;
+
+	ret = imap_parser_read_args(ctx->parser, 1,
+				    IMAP_PARSE_FLAG_LITERAL_SIZE |
+				    IMAP_PARSE_FLAG_LITERAL8, &args);
+	if (ret < 0) {
+		if (ret == -2)
+			return 0;
+		error = imap_parser_get_error(ctx->parser, &parse_error);
+		switch (parse_error) {
+		case IMAP_PARSE_ERROR_NONE:
+			i_unreached();
+		case IMAP_PARSE_ERROR_LITERAL_TOO_BIG:
+			client_disconnect_with_error(ctx->cmd->client, error);
+			break;
+		default:
+			client_send_command_error(ctx->cmd, error);
+			break;
+		}
+		return -1;
+	}
+
+	switch (args[0].type) {
+	case IMAP_ARG_EOL:
+		client_send_command_error(ctx->cmd, "Script value missing");
+		return -1;
+	case IMAP_ARG_NIL:
+	case IMAP_ARG_ATOM:
+	case IMAP_ARG_LIST:
+		client_send_command_error(ctx->cmd,
+					  "Script value must be a string");
+		return -1;
+	case IMAP_ARG_STRING:
+		/* We have the value already */
+		if (ctx->failed)
+			return 1;
+		value = imap_arg_as_astring(&args[0]);
+		input = i_stream_create_from_data(value, strlen(value));
+		cmd_filter_sieve_compile_input(ctx, input);
+		i_stream_unref(&input);
+		return 1;
+	case IMAP_ARG_LITERAL_SIZE:
+		o_stream_nsend(ctx->cmd->client->output, "+ OK\r\n", 6);
+		o_stream_uncork(ctx->cmd->client->output);
+		o_stream_cork(ctx->cmd->client->output);
+		/* Fall through */
+	case IMAP_ARG_LITERAL_SIZE_NONSYNC:
+		ctx->script_len = imap_arg_as_literal_size(&args[0]);
+
+		inputs[0] = i_stream_create_limit(ctx->cmd->client->input,
+						  ctx->script_len);
+		inputs[1] = NULL;
+
+		path = t_str_new(128);
+		mail_user_set_get_temp_prefix(path,
+					      ctx->cmd->client->user->set);
+		ctx->script_input = i_stream_create_seekable_path(
+			inputs, FILTER_MAX_INMEM_SIZE, str_c(path));
+		i_stream_set_name(ctx->script_input,
+				  i_stream_get_name(inputs[0]));
+		i_stream_unref(&inputs[0]);
+		break;
+	case IMAP_ARG_LITERAL:
+		i_unreached();
+	}
+	return cmd_filter_sieve_script_read_stream(ctx);
+}
+
+static bool
+cmd_filter_sieve_script_parse_value(struct client_command_context *cmd)
+{
+	struct imap_filter_context *ctx = cmd->context;
+	struct client *client = cmd->client;
+	int ret;
+
+	if (cmd->cancel) {
+		imap_filter_deinit(ctx);
+		return TRUE;
+	}
+
+	if (ctx->script_input != NULL) {
+		if ((ret = cmd_filter_sieve_script_read_stream(ctx)) == 0)
+			return FALSE;
+	} else {
+		if ((ret = cmd_filter_sieve_script_parse_value_arg(ctx)) == 0)
+			return FALSE;
+	}
+
+	if (ret < 0) {
+		/* Already sent the error to client */ ;
+		imap_filter_deinit(ctx);
+		return TRUE;
+	} else if (ctx->compile_failure) {
+		client_send_tagline(cmd, "NO Failed to compile Sieve script");
+		client->input_skip_line = TRUE;
+		imap_filter_deinit(ctx);
+		return TRUE;
+	}
+
+	imap_parser_reset(ctx->parser);
+	cmd->func = imap_filter_search;
+	return imap_filter_search(cmd);
+}
+
+bool cmd_filter_sieve(struct client_command_context *cmd)
+{
+	struct imap_filter_context *ctx = cmd->context;
+	struct client *client = cmd->client;
+	enum imap_filter_sieve_type type;
+	const struct imap_arg *args;
+	const char *sieve_type;
+
+	if (!client_read_args(cmd, 2, 0, &args))
+		return FALSE;
+	args++;
+
+	/* sieve-type */
+	if (IMAP_ARG_IS_EOL(args)) {
+		client_send_command_error(
+			cmd, "Missing SIEVE filter sub-type.");
+		return TRUE;
+	}
+	if (!imap_arg_get_atom(args, &sieve_type)) {
+		client_send_command_error(
+			cmd, "SIEVE filter sub-type is not an atom.");
+		return TRUE;
+	}
+	if (strcasecmp(sieve_type, "DELIVERY") == 0) {
+		type = IMAP_FILTER_SIEVE_TYPE_DELIVERY;
+	} else if (strcasecmp(sieve_type, "PERSONAL") == 0) {
+		type = IMAP_FILTER_SIEVE_TYPE_PERSONAL;
+	} else if (strcasecmp(sieve_type, "GLOBAL") == 0) {
+		type = IMAP_FILTER_SIEVE_TYPE_GLOBAL;
+	} else if (strcasecmp(sieve_type, "SCRIPT") == 0) {
+		type = IMAP_FILTER_SIEVE_TYPE_SCRIPT;
+	} else {
+		client_send_command_error(cmd, t_strdup_printf(
+			"Unknown SIEVE filter sub-type `%s'",
+			sieve_type));
+		return TRUE;
+	}
+
+	ctx->sieve = imap_filter_sieve_context_create(ctx, type);
+
+	/* We support large scripts, so read the values from client
+	   asynchronously the same way as APPEND does. */
+	client->input_lock = cmd;
+	ctx->parser = imap_parser_create(client->input, client->output,
+					 client->set->imap_max_line_length);
+	if (client->set->imap_literal_minus)
+		imap_parser_enable_literal_minus(ctx->parser);
+	o_stream_unset_flush_callback(client->output);
+
+	switch (type) {
+	case IMAP_FILTER_SIEVE_TYPE_DELIVERY:
+		cmd->func = cmd_filter_sieve_delivery;
+		break;
+	case IMAP_FILTER_SIEVE_TYPE_PERSONAL:
+		cmd->func = cmd_filter_sieve_script_parse_name;
+		break;
+	case IMAP_FILTER_SIEVE_TYPE_GLOBAL:
+		cmd->func = cmd_filter_sieve_script_parse_name;
+		break;
+	case IMAP_FILTER_SIEVE_TYPE_SCRIPT:
+		cmd->func = cmd_filter_sieve_script_parse_value;
+		break;
+	}
+	cmd->context = ctx;
+	return cmd->func(cmd);
+}
diff --git a/pigeonhole/src/plugins/imap-filter-sieve/cmd-filter.c b/pigeonhole/src/plugins/imap-filter-sieve/cmd-filter.c
new file mode 100644
index 0000000..2458047
--- /dev/null
+++ b/pigeonhole/src/plugins/imap-filter-sieve/cmd-filter.c
@@ -0,0 +1,57 @@
+/* Copyright (c) 2017-2018 Pigeonhole authors, see the included COPYING file */
+
+#include "imap-common.h"
+
+#include "imap-filter.h"
+#include "imap-filter-sieve.h"
+
+static bool
+cmd_filter_parse_spec(struct imap_filter_context *ctx,
+		       const struct imap_arg **_args)
+{
+	const struct imap_arg *args = *_args;
+	struct client_command_context *cmd = ctx->cmd;
+	const char *filter_type;
+
+	/* filter-type */
+	if (IMAP_ARG_IS_EOL(args)) {
+		client_send_command_error(cmd,
+			"Missing filter type.");
+		return TRUE;
+	}
+	if (!imap_arg_get_atom(args, &filter_type)) {
+		client_send_command_error(cmd,
+			"Filter type is not an atom.");
+		return TRUE;
+	}
+	if (strcasecmp(filter_type, "SIEVE") != 0) {
+		client_send_command_error(cmd, t_strdup_printf(
+			"Unknown filter type `%s'", filter_type));
+		return TRUE;
+	}
+
+	cmd->func = cmd_filter_sieve;
+	cmd->context = ctx;
+	return cmd_filter_sieve(cmd);
+}
+
+bool cmd_filter(struct client_command_context *cmd)
+{
+	struct imap_filter_context *ctx;
+	const struct imap_arg *args;
+
+	if (!client_read_args(cmd, 1, 0, &args))
+		return FALSE;
+
+	if (!client_verify_open_mailbox(cmd))
+		return TRUE;
+
+	ctx = p_new(cmd->pool, struct imap_filter_context, 1);
+	ctx->cmd = cmd;
+
+	if (!cmd_filter_parse_spec(ctx, &args))
+		return FALSE;
+
+	imap_filter_context_free(ctx);
+	return TRUE;
+}
diff --git a/pigeonhole/src/plugins/imap-filter-sieve/imap-filter-sieve-plugin.c b/pigeonhole/src/plugins/imap-filter-sieve/imap-filter-sieve-plugin.c
new file mode 100644
index 0000000..3021dbe
--- /dev/null
+++ b/pigeonhole/src/plugins/imap-filter-sieve/imap-filter-sieve-plugin.c
@@ -0,0 +1,56 @@
+/* Copyright (c) 2017-2018 Pigeonhole authors, see the included COPYING file */
+
+#include "imap-common.h"
+#include "str.h"
+
+#include "imap-filter-sieve.h"
+#include "imap-filter-sieve-plugin.h"
+
+static struct module *imap_filter_sieve_module;
+static imap_client_created_func_t *next_hook_client_created;
+
+/*
+ * Client
+ */
+
+static void imap_filter_sieve_plugin_client_created(struct client **clientp)
+{
+	struct client *client = *clientp;
+	struct mail_user *user = client->user;
+
+	if (mail_user_is_plugin_loaded(user, imap_filter_sieve_module)) {
+		client_add_capability(client, "FILTER=SIEVE");
+
+		imap_filter_sieve_client_created(client);
+	}
+
+	if (next_hook_client_created != NULL)
+		next_hook_client_created(clientp);
+}
+
+/*
+ * Plugin
+ */
+
+const char *imap_filter_sieve_plugin_version = DOVECOT_ABI_VERSION;
+const char imap_filter_sieve_plugin_binary_dependency[] = "imap";
+
+void imap_filter_sieve_plugin_init(struct module *module)
+{
+	command_register("FILTER", cmd_filter, COMMAND_FLAG_USES_SEQS);
+	command_register("UID FILTER", cmd_filter, COMMAND_FLAG_BREAKS_SEQS);
+
+	imap_filter_sieve_module = module;
+	next_hook_client_created = imap_client_created_hook_set(
+		imap_filter_sieve_plugin_client_created);
+	imap_filter_sieve_init(module);
+}
+
+void imap_filter_sieve_plugin_deinit(void)
+{
+	command_unregister("FILTER");
+	command_unregister("UID FILTER");
+
+	imap_filter_sieve_deinit();
+	imap_client_created_hook_set(next_hook_client_created);
+}
diff --git a/pigeonhole/src/plugins/imap-filter-sieve/imap-filter-sieve-plugin.h b/pigeonhole/src/plugins/imap-filter-sieve/imap-filter-sieve-plugin.h
new file mode 100644
index 0000000..59b4b11
--- /dev/null
+++ b/pigeonhole/src/plugins/imap-filter-sieve/imap-filter-sieve-plugin.h
@@ -0,0 +1,16 @@
+/* Copyright (c) 2017-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#ifndef IMAP_FILTER_SIEVE_PLUGIN_H
+#define IMAP_FILTER_SIEVE_PLUGIN_H
+
+struct module;
+
+extern const char imap_filter_sieve_plugin_binary_dependency[];
+
+bool cmd_filter(struct client_command_context *cmd);
+
+void imap_filter_sieve_plugin_init(struct module *module);
+void imap_filter_sieve_plugin_deinit(void);
+
+#endif
diff --git a/pigeonhole/src/plugins/imap-filter-sieve/imap-filter-sieve.c b/pigeonhole/src/plugins/imap-filter-sieve/imap-filter-sieve.c
new file mode 100644
index 0000000..62519f4
--- /dev/null
+++ b/pigeonhole/src/plugins/imap-filter-sieve/imap-filter-sieve.c
@@ -0,0 +1,1188 @@
+/* Copyright (c) 2017-2018 Pigeonhole authors, see the included COPYING file */
+
+#include "imap-common.h"
+#include "str.h"
+#include "ioloop.h"
+#include "time-util.h"
+#include "module-context.h"
+#include "message-address.h"
+#include "mail-user.h"
+#include "mail-duplicate.h"
+#include "mail-storage-private.h"
+#include "iostream-ssl.h"
+#include "smtp-submit.h"
+#include "sieve.h"
+#include "sieve-storage.h"
+#include "sieve-script.h"
+
+#include "imap-filter-sieve.h"
+
+#define DUPLICATE_DB_NAME "lda-dupes"
+
+#define IMAP_FILTER_SIEVE_USER_CONTEXT(obj) \
+	MODULE_CONTEXT(obj, imap_filter_sieve_user_module)
+#define IMAP_FILTER_SIEVE_USER_CONTEXT_REQUIRE(obj) \
+	MODULE_CONTEXT_REQUIRE(obj, imap_filter_sieve_user_module)
+
+struct imap_filter_sieve_script {
+	struct sieve_script *script;
+	struct sieve_binary *binary;
+
+	/* Compile failed once with this error;
+	   don't try again for this transaction */
+	enum sieve_error compile_error;
+
+	/* Binary corrupt after recompile; don't recompile again */
+	bool binary_corrupt:1;
+	/* Resource usage exceeded */
+	bool rusage_exceeded:1;
+};
+
+struct imap_filter_sieve_user {
+	union mail_user_module_context module_ctx;
+	struct client *client;
+
+	struct sieve_instance *svinst;
+	struct sieve_storage *storage;
+	struct sieve_storage *global_storage;
+
+	struct mail_duplicate_db *dup_db;
+
+	struct sieve_error_handler *master_ehandler;
+};
+
+static MODULE_CONTEXT_DEFINE_INIT(imap_filter_sieve_user_module,
+				  &mail_user_module_register);
+
+/*
+ *
+ */
+
+static const char *
+imap_filter_sieve_get_setting(void *context, const char *identifier)
+{
+	struct imap_filter_sieve_user *ifsuser = context;
+	struct mail_user *user = ifsuser->client->user;
+
+	return mail_user_plugin_getenv(user, identifier);
+}
+
+static const struct sieve_callbacks imap_filter_sieve_callbacks = {
+	NULL,
+	imap_filter_sieve_get_setting
+};
+
+static struct sieve_instance *
+imap_filter_sieve_get_svinst(struct imap_filter_sieve_context *sctx)
+{
+	struct mail_user *user = sctx->user;
+	struct imap_filter_sieve_user *ifsuser =
+		IMAP_FILTER_SIEVE_USER_CONTEXT_REQUIRE(user);
+	struct sieve_environment svenv;
+	const struct mail_storage_settings *mail_set;
+	bool debug = user->mail_debug;
+
+	if (ifsuser->svinst != NULL)
+		return ifsuser->svinst;
+
+	mail_set = mail_user_set_get_storage_set(user);
+
+	ifsuser->dup_db = mail_duplicate_db_init(user, DUPLICATE_DB_NAME);
+
+	i_zero(&svenv);
+	svenv.username = user->username;
+	(void)mail_user_get_home(user, &svenv.home_dir);
+	svenv.hostname = mail_set->hostname;
+	svenv.base_dir = user->set->base_dir;
+	svenv.event_parent = ifsuser->client->event;
+	svenv.flags = SIEVE_FLAG_HOME_RELATIVE;
+	svenv.location = SIEVE_ENV_LOCATION_MS;
+	svenv.delivery_phase = SIEVE_DELIVERY_PHASE_POST;
+
+	ifsuser->svinst = sieve_init(&svenv, &imap_filter_sieve_callbacks,
+				     ifsuser, debug);
+
+	ifsuser->master_ehandler =
+		sieve_master_ehandler_create(ifsuser->svinst, 0);
+	sieve_error_handler_accept_infolog(ifsuser->master_ehandler, TRUE);
+	sieve_error_handler_accept_debuglog(ifsuser->master_ehandler, debug);
+
+	return ifsuser->svinst;
+}
+
+static void
+imap_filter_sieve_init_trace_log(struct imap_filter_sieve_context *sctx,
+				 struct sieve_trace_config *trace_config_r,
+				 struct sieve_trace_log **trace_log_r)
+{
+	struct sieve_instance *svinst = imap_filter_sieve_get_svinst(sctx);
+	struct client_command_context *cmd = sctx->filter_context->cmd;
+	struct mail_user *user = sctx->user;
+
+	if (sctx->trace_log_initialized) {
+		*trace_config_r = sctx->trace_config;
+		*trace_log_r = sctx->trace_log;
+		return;
+	}
+	sctx->trace_log_initialized = TRUE;
+
+	if (sieve_trace_config_get(svinst, &sctx->trace_config) < 0 ||
+	    sieve_trace_log_open(svinst, &sctx->trace_log) < 0) {
+		i_zero(&sctx->trace_config);
+		sctx->trace_log = NULL;
+
+		i_zero(trace_config_r);
+		*trace_log_r = NULL;
+		return;
+	}
+
+	/* Write header for trace file */
+	sieve_trace_log_printf(sctx->trace_log,
+		"Sieve trace log for IMAP FILTER=SIEVE:\n"
+		"\n"
+		"  Username: %s\n", user->username);
+	if (user->session_id != NULL) {
+		sieve_trace_log_printf(sctx->trace_log,
+			"  Session ID: %s\n", user->session_id);
+	}
+	sieve_trace_log_printf(sctx->trace_log,
+		"  Mailbox: %s\n"
+		"  Command: %s %s %s\n\n",
+		mailbox_get_vname(sctx->filter_context->box),
+		cmd->tag, cmd->name,
+		cmd->human_args != NULL ? cmd->human_args : "");
+
+	*trace_config_r = sctx->trace_config;
+	*trace_log_r = sctx->trace_log;
+}
+
+static int
+imap_filter_sieve_get_personal_storage(struct imap_filter_sieve_context *sctx,
+				       struct sieve_storage **storage_r,
+				       enum mail_error *error_code_r,
+				       const char **error_r)
+{
+	struct mail_user *user = sctx->user;
+	struct imap_filter_sieve_user *ifsuser =
+		IMAP_FILTER_SIEVE_USER_CONTEXT_REQUIRE(user);
+	enum sieve_storage_flags storage_flags = 0;
+	struct sieve_instance *svinst;
+	enum sieve_error error;
+
+	*error_code_r = MAIL_ERROR_NONE;
+	*error_r = NULL;
+
+	if (ifsuser->storage != NULL) {
+		*storage_r = ifsuser->storage;
+		return 0;
+	}
+
+	// FIXME: limit interval between retries
+
+	svinst = imap_filter_sieve_get_svinst(sctx);
+	ifsuser->storage = sieve_storage_create_main(svinst, user,
+						     storage_flags, &error);
+	if (ifsuser->storage != NULL) {
+		*storage_r = ifsuser->storage;
+		return 0;
+	}
+
+	switch (error) {
+	case SIEVE_ERROR_NOT_POSSIBLE:
+		*error_r = "Sieve processing is disabled for this user";
+		*error_code_r = MAIL_ERROR_NOTPOSSIBLE;
+		break;
+	case SIEVE_ERROR_NOT_FOUND:
+		*error_r = "Sieve script storage not accessible";
+		*error_code_r = MAIL_ERROR_NOTFOUND;
+		break;
+	default:
+		*error_r = t_strflocaltime(MAIL_ERRSTR_CRITICAL_MSG_STAMP,
+					   ioloop_time);
+		*error_code_r = MAIL_ERROR_TEMP;
+		break;
+	}
+
+	return -1;
+}
+
+static int
+imap_filter_sieve_get_global_storage(struct imap_filter_sieve_context *sctx,
+				     struct sieve_storage **storage_r,
+				     enum mail_error *error_code_r,
+				     const char **error_r)
+{
+	struct mail_user *user = sctx->user;
+	struct imap_filter_sieve_user *ifsuser =
+		IMAP_FILTER_SIEVE_USER_CONTEXT_REQUIRE(user);
+	struct sieve_instance *svinst;
+	const char *location;
+	enum sieve_error error;
+
+	*error_code_r = MAIL_ERROR_NONE;
+	*error_r = NULL;
+
+	if (ifsuser->global_storage != NULL) {
+		*storage_r = ifsuser->global_storage;
+		return 0;
+	}
+
+	svinst = imap_filter_sieve_get_svinst(sctx);
+
+	location = mail_user_plugin_getenv(user, "sieve_global");
+	if (location == NULL) {
+		e_info(sieve_get_event(svinst),
+		       "include: sieve_global is unconfigured; "
+		       "include of `:global' script is therefore not possible");
+		*error_code_r = MAIL_ERROR_NOTFOUND;
+		*error_r = "No global Sieve scripts available";
+		return -1;
+	}
+	ifsuser->global_storage =
+		sieve_storage_create(svinst, location, 0, &error);
+	if (ifsuser->global_storage != NULL) {
+		*storage_r = ifsuser->global_storage;
+		return 0;
+	}
+
+	switch (error) {
+	case SIEVE_ERROR_NOT_POSSIBLE:
+	case SIEVE_ERROR_NOT_FOUND:
+		*error_r = "No global Sieve scripts available";
+		*error_code_r = MAIL_ERROR_NOTFOUND;
+		break;
+	default:
+		*error_r = t_strflocaltime(MAIL_ERRSTR_CRITICAL_MSG_STAMP,
+					   ioloop_time);
+		*error_code_r = MAIL_ERROR_TEMP;
+		break;
+	}
+
+	return -1;
+}
+
+/*
+ *
+ */
+
+struct imap_filter_sieve_context *
+imap_filter_sieve_context_create(struct imap_filter_context *ctx,
+				 enum imap_filter_sieve_type type)
+{
+	struct client_command_context *cmd = ctx->cmd;
+	struct imap_filter_sieve_context *sctx;
+
+	sctx = p_new(cmd->pool, struct imap_filter_sieve_context, 1);
+	sctx->pool = cmd->pool;
+	sctx->filter_context = ctx;
+	sctx->filter_type = type;
+	sctx->user = ctx->cmd->client->user;
+
+	return sctx;
+}
+
+void imap_filter_sieve_context_free(struct imap_filter_sieve_context **_sctx)
+{
+	struct imap_filter_sieve_context *sctx = *_sctx;
+	struct imap_filter_sieve_script *scripts;
+	unsigned int i;
+
+	*_sctx = NULL;
+
+	if (sctx == NULL)
+		return;
+
+	scripts = sctx->scripts;
+	for (i = 0; i < sctx->scripts_count; i++) {
+		if (scripts[i].binary != NULL)
+			sieve_close(&scripts[i].binary);
+		if (scripts[i].script != NULL)
+			sieve_script_unref(&scripts[i].script);
+	}
+
+	if (sctx->trace_log != NULL)
+		sieve_trace_log_free(&sctx->trace_log);
+
+	str_free(&sctx->errors);
+}
+
+/*
+ * Error handling
+ */
+
+static struct sieve_error_handler *
+imap_filter_sieve_create_error_handler(struct imap_filter_sieve_context *sctx)
+{
+	struct sieve_instance *svinst = imap_filter_sieve_get_svinst(sctx);
+
+	/* Prepare error handler */
+	if (sctx->errors == NULL)
+		sctx->errors = str_new(default_pool, 1024);
+	else
+		str_truncate(sctx->errors, 0);
+	return sieve_strbuf_ehandler_create(svinst, sctx->errors, TRUE,
+		10 /* client->set->_max_compile_errors */);
+}
+
+/*
+ *
+ */
+
+static struct sieve_binary *
+imap_sieve_filter_open_script(struct imap_filter_sieve_context *sctx,
+			      struct sieve_script *script,
+			      enum sieve_compile_flags cpflags,
+			      struct sieve_error_handler *user_ehandler,
+			      bool recompile, enum sieve_error *error_r)
+{
+	struct mail_user *user = sctx->user;
+	struct imap_filter_sieve_user *ifsuser =
+		IMAP_FILTER_SIEVE_USER_CONTEXT_REQUIRE(user);
+	struct sieve_instance *svinst = imap_filter_sieve_get_svinst(sctx);
+	struct sieve_error_handler *ehandler;
+	struct sieve_binary *sbin;
+	const char *compile_name = "compile";
+
+	if (recompile) {
+		/* Warn */
+		e_warning(sieve_get_event(svinst),
+			  "Encountered corrupt binary: re-compiling script %s",
+			  sieve_script_location(script));
+		compile_name = "re-compile";
+	} else {
+		e_debug(sieve_get_event(svinst), "Loading script %s",
+			sieve_script_location(script));
+	}
+
+	if (script == sctx->user_script)
+		ehandler = user_ehandler;
+	else
+		ehandler = ifsuser->master_ehandler;
+	sieve_error_handler_reset(ehandler);
+
+	/* Load or compile the sieve script */
+	if (recompile) {
+		sbin = sieve_compile_script(script, ehandler, cpflags, error_r);
+	} else {
+		sbin = sieve_open_script(script, ehandler, cpflags, error_r);
+	}
+
+	/* Handle error */
+	if (sbin == NULL) {
+		switch (*error_r) {
+		/* Script not found */
+		case SIEVE_ERROR_NOT_FOUND:
+			e_debug(sieve_get_event(svinst),
+				"Script `%s' is missing for %s",
+				sieve_script_location(script), compile_name);
+			break;
+		/* Temporary failure */
+		case SIEVE_ERROR_TEMP_FAILURE:
+			e_error(sieve_get_event(svinst),
+				"Failed to open script `%s' for %s "
+				"(temporary failure)",
+				sieve_script_location(script), compile_name);
+			break;
+		/* Compile failed */
+		case SIEVE_ERROR_NOT_VALID:
+			if (script == sctx->user_script)
+				break;
+			e_error(sieve_get_event(svinst),
+				"Failed to %s script `%s'",
+				compile_name, sieve_script_location(script));
+			break;
+		/* Cumulative resource limit exceeded */
+		case SIEVE_ERROR_RESOURCE_LIMIT:
+			e_error(sieve_get_event(svinst),
+				"Failed to open script `%s' for %s "
+				"(cumulative resource limit exceeded)",
+				sieve_script_location(script), compile_name);
+			break;
+		/* Something else */
+		default:
+			e_error(sieve_get_event(svinst),
+				"Failed to open script `%s' for %s",
+				sieve_script_location(script), compile_name);
+			break;
+		}
+
+		return NULL;
+	}
+
+	if (!recompile)
+		(void)sieve_save(sbin, FALSE, NULL);
+	return sbin;
+}
+
+int imap_filter_sieve_compile(struct imap_filter_sieve_context *sctx,
+			      string_t **errors_r, bool *have_warnings_r)
+{
+	struct imap_filter_sieve_script *scripts = sctx->scripts;
+	unsigned int count = sctx->scripts_count, i;
+	struct sieve_error_handler *ehandler;
+	enum sieve_error error;
+	int ret = 0;
+
+	*errors_r = NULL;
+	*have_warnings_r = FALSE;
+
+	/* Prepare error handler */
+	ehandler = imap_filter_sieve_create_error_handler(sctx);
+
+	for (i = 0; i < count; i++) {
+		struct sieve_script *script = scripts[i].script;
+
+		i_assert(script != NULL);
+
+		scripts[i].binary =
+			imap_sieve_filter_open_script(sctx, script, 0, ehandler,
+						     FALSE, &error);
+		if (scripts[i].binary == NULL) {
+			if (error != SIEVE_ERROR_NOT_VALID) {
+				const char *errormsg =
+					sieve_script_get_last_error(
+						script, &error);
+				if (error != SIEVE_ERROR_NONE) {
+					str_truncate(sctx->errors, 0);
+					str_append(sctx->errors, errormsg);
+				}
+			}
+			ret = -1;
+			break;
+		}
+	}
+
+	if (ret < 0 && str_len(sctx->errors) == 0) {
+		/* Failed, but no user error was logged: log a generic internal
+		   error instead. */
+		sieve_internal_error(ehandler, NULL, NULL);
+	}
+
+	*have_warnings_r = (sieve_get_warnings(ehandler) > 0);
+	*errors_r = sctx->errors;
+
+	sieve_error_handler_unref(&ehandler);
+	return ret;
+}
+
+void imap_filter_sieve_open_input(struct imap_filter_sieve_context *sctx,
+				  struct istream *input)
+{
+	struct sieve_instance *svinst;
+	struct sieve_script *script;
+
+	svinst = imap_filter_sieve_get_svinst(sctx);
+	script = sieve_data_script_create_from_input(svinst, "script", input);
+
+	sctx->user_script = script;
+	sctx->scripts = p_new(sctx->pool, struct imap_filter_sieve_script, 1);
+	sctx->scripts_count = 1;
+	sctx->scripts[0].script = script;
+}
+
+int imap_filter_sieve_open_personal(struct imap_filter_sieve_context *sctx,
+				    const char *name,
+				    enum mail_error *error_code_r,
+				    const char **error_r)
+{
+	struct sieve_storage *storage;
+	struct sieve_script *script;
+	enum sieve_error error;
+
+	if (imap_filter_sieve_get_personal_storage(sctx, &storage,
+						   error_code_r, error_r) < 0)
+		return -1;
+
+	if (name == NULL)
+		script = sieve_storage_active_script_open(storage, NULL);
+	else
+		script = sieve_storage_open_script(storage, name, NULL);
+	if (script == NULL) {
+		*error_r = sieve_storage_get_last_error(storage, &error);
+
+		switch (error) {
+		case SIEVE_ERROR_NOT_FOUND:
+			*error_code_r = MAIL_ERROR_NOTFOUND;
+			break;
+		case SIEVE_ERROR_NOT_POSSIBLE:
+			*error_code_r = MAIL_ERROR_NOTPOSSIBLE;
+			break;
+		default:
+			*error_code_r = MAIL_ERROR_TEMP;
+		}
+		return -1;
+	}
+
+	sctx->user_script = script;
+	sctx->scripts = p_new(sctx->pool, struct imap_filter_sieve_script, 1);
+	sctx->scripts_count = 1;
+	sctx->scripts[0].script = script;
+	return 0;
+}
+
+int imap_filter_sieve_open_global(struct imap_filter_sieve_context *sctx,
+				  const char *name,
+				  enum mail_error *error_code_r,
+				  const char **error_r)
+{
+	struct sieve_storage *storage;
+	struct sieve_script *script;
+	enum sieve_error error;
+
+	if (imap_filter_sieve_get_global_storage(sctx, &storage,
+						 error_code_r, error_r) < 0)
+		return -1;
+
+	script = sieve_storage_open_script(storage, name, NULL);
+	if (script == NULL) {
+		*error_r = sieve_storage_get_last_error(storage, &error);
+
+		switch (error) {
+		case SIEVE_ERROR_NOT_FOUND:
+			*error_code_r = MAIL_ERROR_NOTFOUND;
+			break;
+		case SIEVE_ERROR_NOT_POSSIBLE:
+			*error_code_r = MAIL_ERROR_NOTPOSSIBLE;
+			break;
+		default:
+			*error_code_r = MAIL_ERROR_TEMP;
+		}
+		return -1;
+	}
+
+	sctx->user_script = script;
+	sctx->scripts = p_new(sctx->pool, struct imap_filter_sieve_script, 1);
+	sctx->scripts_count = 1;
+	sctx->scripts[0].script = script;
+	return 0;
+}
+
+/*
+ * Mail transmission
+ */
+
+static void *
+imap_filter_sieve_smtp_start(const struct sieve_script_env *senv,
+			     const struct smtp_address *mail_from)
+{
+	struct imap_filter_sieve_context *sctx = senv->script_context;
+	struct mail_user *user = sctx->user;
+	struct imap_filter_sieve_user *ifsuser =
+		IMAP_FILTER_SIEVE_USER_CONTEXT_REQUIRE(user);
+	const struct smtp_submit_settings *smtp_set = ifsuser->client->smtp_set;
+	struct ssl_iostream_settings ssl_set;
+	struct smtp_submit_input submit_input;
+
+	i_zero(&ssl_set);
+	mail_user_init_ssl_client_settings(user, &ssl_set);
+
+	i_zero(&submit_input);
+	submit_input.ssl = &ssl_set;
+
+	return (void *)smtp_submit_init_simple(&submit_input, smtp_set,
+					       mail_from);
+}
+
+static void
+imap_filter_sieve_smtp_add_rcpt(const struct sieve_script_env *senv ATTR_UNUSED,
+				void *handle,
+				const struct smtp_address *rcpt_to)
+{
+	struct smtp_submit *smtp_submit = handle;
+
+	smtp_submit_add_rcpt(smtp_submit, rcpt_to);
+}
+
+static struct ostream *
+imap_filter_sieve_smtp_send(const struct sieve_script_env *senv ATTR_UNUSED,
+			    void *handle)
+{
+	struct smtp_submit *smtp_submit = handle;
+
+	return smtp_submit_send(smtp_submit);
+}
+
+static void
+imap_filter_sieve_smtp_abort(const struct sieve_script_env *senv ATTR_UNUSED,
+			     void *handle)
+{
+	struct smtp_submit *smtp_submit = handle;
+
+	smtp_submit_deinit(&smtp_submit);
+}
+
+static int
+imap_filter_sieve_smtp_finish(const struct sieve_script_env *senv ATTR_UNUSED,
+			      void *handle, const char **error_r)
+{
+	struct smtp_submit *smtp_submit = handle;
+	int ret;
+
+	ret = smtp_submit_run(smtp_submit, error_r);
+	smtp_submit_deinit(&smtp_submit);
+	return ret;
+}
+
+/*
+ * Duplicate checking
+ */
+
+static void *
+imap_filter_sieve_duplicate_transaction_begin(
+	const struct sieve_script_env *senv)
+{
+	struct imap_filter_sieve_context *sctx = senv->script_context;
+	struct imap_filter_sieve_user *ifsuser =
+		IMAP_FILTER_SIEVE_USER_CONTEXT_REQUIRE(sctx->user);
+
+	return mail_duplicate_transaction_begin(ifsuser->dup_db);
+}
+
+static void imap_filter_sieve_duplicate_transaction_commit(void **_dup_trans)
+{
+	struct mail_duplicate_transaction *dup_trans = *_dup_trans;
+
+	*_dup_trans = NULL;
+
+	mail_duplicate_transaction_commit(&dup_trans);
+}
+
+static void imap_filter_sieve_duplicate_transaction_rollback(void **_dup_trans)
+{
+	struct mail_duplicate_transaction *dup_trans = *_dup_trans;
+
+	*_dup_trans = NULL;
+
+	mail_duplicate_transaction_rollback(&dup_trans);
+}
+
+static enum sieve_duplicate_check_result
+imap_filter_sieve_duplicate_check(void *_dup_trans,
+				  const struct sieve_script_env *senv,
+				  const void *id, size_t id_size)
+{
+	struct mail_duplicate_transaction *dup_trans = _dup_trans;
+
+	switch (mail_duplicate_check(dup_trans, id, id_size,
+				     senv->user->username)) {
+	case MAIL_DUPLICATE_CHECK_RESULT_EXISTS:
+		return SIEVE_DUPLICATE_CHECK_RESULT_EXISTS;
+	case MAIL_DUPLICATE_CHECK_RESULT_NOT_FOUND:
+		return SIEVE_DUPLICATE_CHECK_RESULT_NOT_FOUND;
+	case MAIL_DUPLICATE_CHECK_RESULT_DEADLOCK:
+	case MAIL_DUPLICATE_CHECK_RESULT_LOCK_TIMEOUT:
+		return SIEVE_DUPLICATE_CHECK_RESULT_TEMP_FAILURE;
+	case MAIL_DUPLICATE_CHECK_RESULT_IO_ERROR:
+	case MAIL_DUPLICATE_CHECK_RESULT_TOO_MANY_LOCKS:
+		break;
+	}
+	return SIEVE_DUPLICATE_CHECK_RESULT_FAILURE;
+}
+
+static void
+imap_filter_sieve_duplicate_mark(void *_dup_trans,
+				 const struct sieve_script_env *senv,
+				 const void *id, size_t id_size, time_t time)
+{
+	struct mail_duplicate_transaction *dup_trans = _dup_trans;
+
+	mail_duplicate_mark(dup_trans, id, id_size, senv->user->username, time);
+}
+
+/*
+ * Result logging
+ */
+
+static const char *
+imap_filter_sieve_result_amend_log_message(const struct sieve_script_env *senv,
+					   enum log_type log_type ATTR_UNUSED,
+					   const char *message)
+{
+	struct imap_filter_sieve_context *sctx = senv->script_context;
+	string_t *str;
+
+	if (sctx->mail == NULL)
+		return message;
+
+	str = t_str_new(256);
+	str_printfa(str, "uid=%u: ", sctx->mail->uid);
+	str_append(str, message);
+	return str_c(str);
+}
+
+/*
+ *
+ */
+
+static int
+imap_sieve_filter_handle_exec_status(struct imap_filter_sieve_context *sctx,
+				     struct sieve_script *script, int status,
+				     struct sieve_exec_status *estatus,
+				     bool *fatal_r)
+{
+	struct imap_filter_sieve_user *ifsuser =
+		IMAP_FILTER_SIEVE_USER_CONTEXT_REQUIRE(sctx->user);
+	struct sieve_instance *svinst = ifsuser->svinst;
+	enum log_type log_level, user_log_level;
+	enum mail_error mail_error = MAIL_ERROR_NONE;
+	int ret = -1;
+
+	*fatal_r = FALSE;
+
+	log_level = user_log_level = LOG_TYPE_ERROR;
+
+	if (estatus->last_storage != NULL && estatus->store_failed) {
+		(void)mail_storage_get_last_error(estatus->last_storage,
+						  &mail_error);
+
+		/* Don't bother administrator too much with benign errors */
+		if (mail_error == MAIL_ERROR_NOQUOTA) {
+			log_level = LOG_TYPE_INFO;
+			user_log_level = LOG_TYPE_INFO;
+		}
+	}
+
+	switch (status) {
+	case SIEVE_EXEC_FAILURE:
+		e_log(sieve_get_event(svinst), user_log_level,
+		      "Execution of script %s failed",
+		      sieve_script_location(script));
+		ret = -1;
+		break;
+	case SIEVE_EXEC_TEMP_FAILURE:
+		e_log(sieve_get_event(svinst), log_level,
+		      "Execution of script %s was aborted "
+		      "due to temporary failure",
+		      sieve_script_location(script));
+		*fatal_r = TRUE;
+		ret = -1;
+		break;
+	case SIEVE_EXEC_BIN_CORRUPT:
+		e_error(sieve_get_event(svinst),
+			"!!BUG!!: Binary compiled from %s is still corrupt; "
+			"bailing out and reverting to default action",
+			sieve_script_location(script));
+		*fatal_r = TRUE;
+		ret = -1;
+		break;
+	case SIEVE_EXEC_RESOURCE_LIMIT:
+		e_error(sieve_get_event(svinst),
+			"Execution of script %s was aborted "
+			"due to excessive resource usage",
+			sieve_script_location(script));
+		*fatal_r = TRUE;
+		ret = -1;
+		break;
+	case SIEVE_EXEC_KEEP_FAILED:
+		e_log(sieve_get_event(svinst), log_level,
+		      "Execution of script %s failed "
+		      "with unsuccessful implicit keep",
+		      sieve_script_location(script));
+		ret = -1;
+		break;
+	case SIEVE_EXEC_OK:
+		ret = (estatus->keep_original ? 0 : 1);
+		break;
+	}
+
+	return ret;
+}
+
+static int
+imap_sieve_filter_run_scripts(struct imap_filter_sieve_context *sctx,
+			      struct sieve_error_handler *user_ehandler,
+			      const struct sieve_message_data *msgdata,
+			      const struct sieve_script_env *scriptenv,
+			      bool *fatal_r)
+{
+	struct mail_user *user = sctx->user;
+	struct imap_filter_sieve_user *ifsuser =
+		IMAP_FILTER_SIEVE_USER_CONTEXT_REQUIRE(user);
+	struct sieve_instance *svinst = ifsuser->svinst;
+	struct imap_filter_sieve_script *scripts = sctx->scripts;
+	unsigned int count = sctx->scripts_count;
+	struct sieve_resource_usage *rusage =
+		&scriptenv->exec_status->resource_usage;
+	struct sieve_multiscript *mscript;
+	struct sieve_error_handler *ehandler;
+	struct sieve_script *last_script = NULL;
+	bool user_script = FALSE, more = TRUE, rusage_exceeded = FALSE;
+	enum sieve_compile_flags cpflags;
+	enum sieve_execute_flags exflags;
+	enum sieve_error compile_error = SIEVE_ERROR_NONE;
+	unsigned int i;
+	int ret;
+
+	*fatal_r = FALSE;
+
+	/* Start execution */
+	mscript = sieve_multiscript_start_execute(svinst, msgdata, scriptenv);
+
+	/* Execute scripts */
+	for (i = 0; i < count && more; i++) {
+		struct sieve_script *script = scripts[i].script;
+		struct sieve_binary *sbin = scripts[i].binary;
+		int mstatus;
+
+		if (sbin == NULL) {
+			e_debug(sieve_get_event(svinst),
+				"Skipping script from `%s'",
+				sieve_script_location(script));
+			continue;
+		}
+
+		cpflags = 0;
+		exflags = SIEVE_EXECUTE_FLAG_SKIP_RESPONSES;
+
+		user_script = (script == sctx->user_script);
+		last_script = script;
+
+		if (scripts[i].rusage_exceeded) {
+			rusage_exceeded = TRUE;
+			break;
+		}
+
+		sieve_resource_usage_init(rusage);
+		if (user_script) {
+			cpflags |= SIEVE_COMPILE_FLAG_NOGLOBAL;
+			exflags |= SIEVE_EXECUTE_FLAG_NOGLOBAL;
+			ehandler = user_ehandler;
+		} else {
+			ehandler = ifsuser->master_ehandler;
+		}
+
+		/* Execute */
+		e_debug(sieve_get_event(svinst),
+			"Executing script from `%s'",
+			sieve_get_source(sbin));
+		more = sieve_multiscript_run(mscript,
+			sbin, ehandler, ehandler, exflags);
+
+		mstatus = sieve_multiscript_status(mscript);
+		if (!more && mstatus == SIEVE_EXEC_BIN_CORRUPT &&
+		    !scripts[i].binary_corrupt && sieve_is_loaded(sbin)) {
+			/* Close corrupt script */
+			sieve_close(&sbin);
+
+			/* Recompile */
+			scripts[i].binary = sbin =
+				imap_sieve_filter_open_script(
+					sctx, script, cpflags, user_ehandler,
+					FALSE, &compile_error);
+			if (sbin == NULL) {
+				scripts[i].compile_error = compile_error;
+				break;
+			}
+
+			/* Execute again */
+			more = sieve_multiscript_run(mscript, sbin,
+						     ehandler, ehandler,
+						     exflags);
+
+			/* Save new version */
+
+			mstatus = sieve_multiscript_status(mscript);
+			if (mstatus == SIEVE_EXEC_BIN_CORRUPT)
+				scripts[i].binary_corrupt = TRUE;
+			else if (more)
+				(void)sieve_save(sbin, FALSE, NULL);
+		}
+
+		if (user_script && !sieve_record_resource_usage(sbin, rusage)) {
+			rusage_exceeded = ((i + 1) < count && more);
+			scripts[i].rusage_exceeded = TRUE;
+			break;
+		}
+	}
+
+	/* Finish execution */
+	exflags = SIEVE_EXECUTE_FLAG_SKIP_RESPONSES;
+	ehandler = (user_ehandler != NULL ?
+		user_ehandler : ifsuser->master_ehandler);
+	if (compile_error == SIEVE_ERROR_TEMP_FAILURE) {
+		ret = sieve_multiscript_finish(&mscript, ehandler, exflags,
+					       SIEVE_EXEC_TEMP_FAILURE);
+	} else if (rusage_exceeded) {
+		i_assert(last_script != NULL);
+		(void)sieve_multiscript_finish(&mscript, ehandler, exflags,
+					       SIEVE_EXEC_TEMP_FAILURE);
+		sieve_error(ehandler, sieve_script_name(last_script),
+			    "cumulative resource usage limit exceeded");
+		ret = SIEVE_EXEC_RESOURCE_LIMIT;
+	} else {
+		ret = sieve_multiscript_finish(&mscript, ehandler, exflags,
+					       SIEVE_EXEC_OK);
+	}
+
+	/* Don't log additional messages about compile failure */
+	if (compile_error != SIEVE_ERROR_NONE &&
+	    ret == SIEVE_EXEC_FAILURE) {
+		e_info(sieve_get_event(svinst),
+		       "Aborted script execution sequence "
+		       "with successful implicit keep");
+		return 0;
+	}
+
+	if (last_script == NULL && ret == SIEVE_EXEC_OK)
+		return 0;
+	i_assert(last_script != NULL); /* at least one script is executed */
+	return imap_sieve_filter_handle_exec_status(sctx, last_script, ret,
+						    scriptenv->exec_status,
+						    fatal_r);
+}
+
+static int
+parse_address(const char *address, const struct smtp_address **addr_r)
+{
+	struct message_address *msg_addr;
+	struct smtp_address *smtp_addr;
+
+	if (message_address_parse_path(pool_datastack_create(),
+				       (const unsigned char *)address,
+				       strlen(address), &msg_addr) < 0) {
+		*addr_r = NULL;
+		return -1;
+	}
+	if (smtp_address_create_from_msg_temp(msg_addr, &smtp_addr) < 0) {
+		*addr_r = NULL;
+		return -1;
+	}
+
+	*addr_r = smtp_addr;
+	return 1;
+}
+
+int imap_sieve_filter_run_init(struct imap_filter_sieve_context *sctx)
+{
+	struct sieve_instance *svinst = imap_filter_sieve_get_svinst(sctx);
+	struct sieve_script_env *scriptenv = &sctx->scriptenv;
+	struct mail_user *user = sctx->user;
+	const char *error;
+
+	if (sieve_script_env_init(scriptenv, user, &error) < 0) {
+		e_error(sieve_get_event(svinst),
+			"Failed to initialize script execution: %s",
+			error);
+		return -1;
+	}
+
+	scriptenv->smtp_start = imap_filter_sieve_smtp_start;
+	scriptenv->smtp_add_rcpt = imap_filter_sieve_smtp_add_rcpt;
+	scriptenv->smtp_send = imap_filter_sieve_smtp_send;
+	scriptenv->smtp_abort = imap_filter_sieve_smtp_abort;
+	scriptenv->smtp_finish = imap_filter_sieve_smtp_finish;
+	scriptenv->duplicate_transaction_begin =
+		imap_filter_sieve_duplicate_transaction_begin;
+	scriptenv->duplicate_transaction_commit =
+		imap_filter_sieve_duplicate_transaction_commit;
+	scriptenv->duplicate_transaction_rollback =
+		imap_filter_sieve_duplicate_transaction_rollback;
+	scriptenv->duplicate_mark = imap_filter_sieve_duplicate_mark;
+	scriptenv->duplicate_check = imap_filter_sieve_duplicate_check;
+	scriptenv->script_context = sctx;
+	return 0;
+}
+
+static void
+imap_sieve_filter_get_msgdata(struct imap_filter_sieve_context *sctx,
+			      struct mail *mail,
+			      struct sieve_message_data *msgdata_r)
+{
+	struct sieve_instance *svinst = imap_filter_sieve_get_svinst(sctx);
+	struct mail_user *user = sctx->user;
+	const char *address, *error;
+	const struct smtp_address *mail_from, *rcpt_to;
+	struct smtp_address *user_addr;
+	int ret;
+
+	mail_from = NULL;
+	if ((ret = mail_get_special(mail, MAIL_FETCH_FROM_ENVELOPE,
+				    &address)) > 0 &&
+	    (ret = parse_address(address, &mail_from)) < 0) {
+		e_warning(sieve_get_event(svinst),
+			  "Failed to parse message FROM_ENVELOPE");
+	}
+	if (ret <= 0 &&
+	    mail_get_first_header(mail, "Return-Path",
+				  &address) > 0 &&
+	    parse_address(address, &mail_from) < 0) {
+		e_info(sieve_get_event(svinst),
+		       "Failed to parse Return-Path header");
+	}
+
+	rcpt_to = NULL;
+	if (mail_get_first_header(mail, "Delivered-To",
+				  &address) > 0 &&
+	    parse_address(address, &rcpt_to) < 0) {
+		e_info(sieve_get_event(svinst),
+		       "Failed to parse Delivered-To header");
+	}
+	if (rcpt_to == NULL) {
+		if (svinst->user_email != NULL)
+			rcpt_to = svinst->user_email;
+		else if (smtp_address_parse_username(sctx->pool, user->username,
+						     &user_addr, &error) < 0) {
+			e_warning(sieve_get_event(svinst),
+				  "Cannot obtain SMTP address from username `%s': %s",
+				  user->username, error);
+		} else {
+			if (user_addr->domain == NULL)
+				user_addr->domain = svinst->domainname;
+			rcpt_to = user_addr;
+		}
+	}
+
+	// FIXME: maybe parse top Received header.
+
+	i_zero(msgdata_r);
+	msgdata_r->mail = mail;
+	msgdata_r->envelope.mail_from = mail_from;
+	msgdata_r->envelope.rcpt_to = rcpt_to;
+	msgdata_r->auth_user = user->username;
+	(void)mail_get_message_id(mail, &msgdata_r->id);
+}
+
+int imap_sieve_filter_run_mail(struct imap_filter_sieve_context *sctx,
+			       struct mail *mail, string_t **errors_r,
+			       bool *have_warnings_r, bool *have_changes_r,
+			       bool *fatal_r)
+{
+	struct sieve_error_handler *user_ehandler;
+	struct sieve_message_data msgdata;
+	struct sieve_script_env *scriptenv = &sctx->scriptenv;
+	struct sieve_exec_status estatus;
+	struct sieve_trace_config trace_config;
+	struct sieve_trace_log *trace_log;
+	int ret;
+
+	*errors_r = NULL;
+	*have_warnings_r = FALSE;
+	*have_changes_r = FALSE;
+	i_zero(&estatus);
+
+	sctx->mail = mail;
+
+	/* Prepare error handler */
+	user_ehandler = imap_filter_sieve_create_error_handler(sctx);
+
+	/* Initialize trace logging */
+	imap_filter_sieve_init_trace_log(sctx, &trace_config, &trace_log);
+
+	T_BEGIN {
+		if (trace_log != NULL) {
+			/* Write trace header for message */
+			sieve_trace_log_printf(trace_log,
+				"Filtering message:\n"
+				"\n"
+				"  UID: %u\n", mail->uid);
+		}
+
+		/* Collect necessary message data */
+
+		imap_sieve_filter_get_msgdata(sctx, mail, &msgdata);
+
+		/* Complete script execution environment */
+
+		scriptenv->default_mailbox = mailbox_get_vname(mail->box);
+		scriptenv->result_amend_log_message =
+			imap_filter_sieve_result_amend_log_message;
+		scriptenv->trace_log = trace_log;
+		scriptenv->trace_config = trace_config;
+		scriptenv->script_context = sctx;
+
+		scriptenv->exec_status = &estatus;
+
+		/* Execute script(s) */
+
+		ret = imap_sieve_filter_run_scripts(sctx, user_ehandler,
+						    &msgdata, scriptenv,
+						    fatal_r);
+	} T_END;
+
+	if (ret < 0 && str_len(sctx->errors) == 0) {
+		/* Failed, but no user error was logged: log a generic internal
+		   error instead. */
+		sieve_internal_error(user_ehandler, NULL, NULL);
+	}
+
+	*have_warnings_r = (sieve_get_warnings(user_ehandler) > 0);
+	*have_changes_r = estatus.significant_action_executed;
+	*errors_r = sctx->errors;
+
+	sieve_error_handler_unref(&user_ehandler);
+
+	sctx->mail = NULL;
+
+	return ret;
+}
+
+/*
+ * User
+ */
+
+static void imap_filter_sieve_user_deinit(struct mail_user *user)
+{
+	struct imap_filter_sieve_user *ifsuser =
+		IMAP_FILTER_SIEVE_USER_CONTEXT_REQUIRE(user);
+
+	sieve_error_handler_unref(&ifsuser->master_ehandler);
+
+	if (ifsuser->storage != NULL)
+		sieve_storage_unref(&ifsuser->storage);
+	if (ifsuser->global_storage != NULL)
+		sieve_storage_unref(&ifsuser->global_storage);
+	if (ifsuser->svinst != NULL)
+		sieve_deinit(&ifsuser->svinst);
+	if (ifsuser->dup_db != NULL)
+		mail_duplicate_db_deinit(&ifsuser->dup_db);
+
+	ifsuser->module_ctx.super.deinit(user);
+}
+
+static void imap_filter_sieve_user_created(struct mail_user *user)
+{
+	struct imap_filter_sieve_user *ifsuser;
+	struct mail_user_vfuncs *v = user->vlast;
+
+	ifsuser = p_new(user->pool, struct imap_filter_sieve_user, 1);
+	ifsuser->module_ctx.super = *v;
+	user->vlast = &ifsuser->module_ctx.super;
+	v->deinit = imap_filter_sieve_user_deinit;
+	MODULE_CONTEXT_SET(user, imap_filter_sieve_user_module, ifsuser);
+}
+
+/*
+ * Hooks
+ */
+
+static struct mail_storage_hooks imap_filter_sieve_mail_storage_hooks = {
+	.mail_user_created = imap_filter_sieve_user_created,
+};
+
+/*
+ * Client
+ */
+
+void imap_filter_sieve_client_created(struct client *client)
+{
+	struct imap_filter_sieve_user *ifsuser =
+		IMAP_FILTER_SIEVE_USER_CONTEXT_REQUIRE(client->user);
+
+	ifsuser->client = client;
+}
+
+/*
+ *
+ */
+
+void imap_filter_sieve_init(struct module *module)
+{
+	mail_storage_hooks_add(module, &imap_filter_sieve_mail_storage_hooks);
+}
+
+void imap_filter_sieve_deinit(void)
+{
+	mail_storage_hooks_remove(&imap_filter_sieve_mail_storage_hooks);
+}
+
+
diff --git a/pigeonhole/src/plugins/imap-filter-sieve/imap-filter-sieve.h b/pigeonhole/src/plugins/imap-filter-sieve/imap-filter-sieve.h
new file mode 100644
index 0000000..c06cbdb
--- /dev/null
+++ b/pigeonhole/src/plugins/imap-filter-sieve/imap-filter-sieve.h
@@ -0,0 +1,97 @@
+#ifndef IMAP_FILTER_SIEVE_H
+#define IMAP_FILTER_SIEVE_H
+
+#include "sieve.h"
+#include "imap-filter.h"
+
+struct imap_filter_sieve_script;
+struct imap_filter_sieve_context;
+
+enum imap_filter_sieve_type {
+	IMAP_FILTER_SIEVE_TYPE_DELIVERY,
+	IMAP_FILTER_SIEVE_TYPE_PERSONAL,
+	IMAP_FILTER_SIEVE_TYPE_GLOBAL,
+	IMAP_FILTER_SIEVE_TYPE_SCRIPT,
+};
+
+struct imap_filter_sieve_context {
+	pool_t pool;
+
+	struct imap_filter_context *filter_context;
+	enum imap_filter_sieve_type filter_type;
+
+	struct mail_user *user;
+
+	struct sieve_script *user_script;
+	struct imap_filter_sieve_script *scripts;
+	unsigned int scripts_count;
+
+	struct mail *mail;
+
+	struct sieve_script_env scriptenv;
+	struct sieve_trace_config trace_config;
+	struct sieve_trace_log *trace_log;
+
+	string_t *errors;
+
+	bool warnings:1;
+	bool trace_log_initialized:1;
+};
+
+/*
+ * FILTER Command
+ */
+
+bool cmd_filter_sieve(struct client_command_context *cmd);
+
+/*
+ * Context
+ */
+
+struct imap_filter_sieve_context *
+imap_filter_sieve_context_create(struct imap_filter_context *ctx,
+				 enum imap_filter_sieve_type type);
+void imap_filter_sieve_context_free(struct imap_filter_sieve_context **_sctx);
+
+/*
+ * Compile
+ */
+
+int imap_filter_sieve_compile(struct imap_filter_sieve_context *sctx,
+			      string_t **errors_r, bool *have_warnings_r);
+
+/*
+ * Open
+ */
+
+void imap_filter_sieve_open_input(struct imap_filter_sieve_context *sctx,
+				  struct istream *input);
+int imap_filter_sieve_open_personal(struct imap_filter_sieve_context *sctx,
+				    const char *name,
+				    enum mail_error *error_code_r,
+				    const char **error_r) ATTR_NULL(2);
+int imap_filter_sieve_open_global(struct imap_filter_sieve_context *sctx,
+				    const char *name,
+				    enum mail_error *error_code_r,
+				    const char **error_r);
+
+/*
+ * Run
+ */
+
+int imap_sieve_filter_run_init(struct imap_filter_sieve_context *sctx);
+int imap_sieve_filter_run_mail(struct imap_filter_sieve_context *sctx,
+			       struct mail *mail, string_t **errors_r,
+			       bool *have_warnings_r, bool *have_changes_r,
+			       bool *fatal_r);
+
+/*
+ *
+ */
+
+void imap_filter_sieve_client_created(struct client *client);
+
+void imap_filter_sieve_init(struct module *module);
+void imap_filter_sieve_deinit(void);
+
+#endif
diff --git a/pigeonhole/src/plugins/imap-filter-sieve/imap-filter.c b/pigeonhole/src/plugins/imap-filter-sieve/imap-filter.c
new file mode 100644
index 0000000..fd7d758
--- /dev/null
+++ b/pigeonhole/src/plugins/imap-filter-sieve/imap-filter.c
@@ -0,0 +1,273 @@
+/* Copyright (c) 2017-2018 Pigeonhole authors, see the included COPYING file */
+
+#include "imap-common.h"
+#include "str.h"
+#include "ostream.h"
+#include "time-util.h"
+#include "imap-resp-code.h"
+#include "imap-search-args.h"
+
+#include "imap-filter.h"
+#include "imap-filter-sieve.h"
+
+static void imap_filter_args_check(struct imap_filter_context *ctx,
+				   const struct mail_search_arg *sargs)
+{
+	for (; sargs != NULL; sargs = sargs->next) {
+		switch (sargs->type) {
+		case SEARCH_SEQSET:
+			ctx->have_seqsets = TRUE;
+			break;
+		case SEARCH_MODSEQ:
+			ctx->have_modseqs = TRUE;
+			break;
+		case SEARCH_OR:
+		case SEARCH_SUB:
+			imap_filter_args_check(ctx, sargs->value.subargs);
+			break;
+		default:
+			break;
+		}
+	}
+}
+
+static bool
+imap_filter_mail(struct client_command_context *cmd, struct mail *mail)
+{
+	struct imap_filter_context *ctx = cmd->context;
+	struct client *client = cmd->client;
+	string_t *errors = NULL;
+	bool have_warnings = FALSE, have_changes = FALSE, fatal = FALSE;
+	string_t *reply = t_str_new(128);
+	int ret;
+
+	ret = imap_sieve_filter_run_mail(ctx->sieve, mail, &errors,
+					 &have_warnings, &have_changes, &fatal);
+
+	str_printfa(reply, "* %u FILTERED (TAG %s) UID %u ",
+		    mail->seq, cmd->tag, mail->uid);
+	if (ret < 0 || have_warnings) {
+		str_printfa(reply, "%s {%zu}\r\n",
+			    (ret < 0 ? "ERRORS" : "WARNINGS"),
+			    str_len(errors));
+		str_append_str(reply, errors);
+		str_append(reply, "\r\n");
+	} else if (have_changes || ret > 0) {
+		str_append(reply, "OK\r\n");
+	} else {
+		str_truncate(reply, 0);
+	}
+	if (str_len(reply) > 0)
+		o_stream_nsend(client->output, str_data(reply), str_len(reply));
+
+	/* Handle the result */
+	if (ret < 0) {
+		/* Sieve error; keep */
+	} else {
+		if (ret > 0) {
+			/* Discard */
+			mail_update_flags(mail, MODIFY_ADD, MAIL_DELETED);
+		}
+	}
+
+	return !fatal;
+}
+
+static bool imap_filter_more(struct client_command_context *cmd)
+{
+	struct imap_filter_context *ctx = cmd->context;
+	struct mail *mail;
+	enum mailbox_sync_flags sync_flags;
+	const char *ok_reply;
+	bool tryagain, lost_data;
+
+	if (cmd->cancel) {
+		(void)imap_filter_deinit(ctx);
+		return TRUE;
+	}
+
+	while (mailbox_search_next_nonblock(ctx->search_ctx,
+					    &mail, &tryagain)) {
+		bool ret;
+		T_BEGIN {
+			ret = imap_filter_mail(cmd, mail);
+		} T_END;
+		if (!ret)
+			break;
+	}
+	if (tryagain)
+		return FALSE;
+
+	lost_data = mailbox_search_seen_lost_data(ctx->search_ctx);
+	if (imap_filter_deinit(ctx) < 0) {
+		client_send_box_error(cmd, cmd->client->mailbox);
+		return TRUE;
+	}
+
+	sync_flags = MAILBOX_SYNC_FLAG_FAST;
+	if (!cmd->uid || ctx->have_seqsets)
+		sync_flags |= MAILBOX_SYNC_FLAG_NO_EXPUNGES;
+	ok_reply = t_strdup_printf("OK %sFilter completed",
+		lost_data ? "["IMAP_RESP_CODE_EXPUNGEISSUED"] " : "");
+	return cmd_sync(cmd, sync_flags, 0, ok_reply);
+}
+
+static void imap_filter_more_callback(struct client_command_context *cmd)
+{
+	struct client *client = cmd->client;
+	bool finished;
+
+	o_stream_cork(client->output);
+	finished = command_exec(cmd);
+	o_stream_uncork(client->output);
+
+	if (!finished)
+		(void)client_handle_unfinished_cmd(cmd);
+	else
+		client_command_free(&cmd);
+	cmd_sync_delayed(client);
+
+	if (client->disconnected)
+		client_destroy(client, NULL);
+	else
+		client_continue_pending_input(client);
+}
+
+static bool
+imap_filter_start(struct imap_filter_context *ctx,
+		  struct mail_search_args *sargs)
+{
+	struct client_command_context *cmd = ctx->cmd;
+
+	imap_filter_args_check(ctx, sargs->args);
+
+	if (ctx->have_modseqs)
+		(void)client_enable(cmd->client, MAILBOX_FEATURE_CONDSTORE);
+
+	ctx->box = cmd->client->mailbox;
+	ctx->trans = mailbox_transaction_begin(ctx->box, 0,
+					       imap_client_command_get_reason(cmd));
+	ctx->sargs = sargs;
+	ctx->search_ctx = mailbox_search_init(ctx->trans, sargs, NULL, 0, NULL);
+
+	if (imap_sieve_filter_run_init(ctx->sieve) < 0) {
+		const char *error = t_strflocaltime(
+			MAIL_ERRSTR_CRITICAL_MSG_STAMP, ioloop_time);
+
+		o_stream_nsend_str(cmd->client->output,
+			t_strdup_printf("* FILTER (TAG %s) "
+				"ERRORS {%zu}\r\n%s\r\n",
+				cmd->tag, strlen(error), error));
+		client_send_tagline(cmd,
+			"NO Failed to initialize script execution");
+		(void)imap_filter_deinit(ctx);
+		return TRUE;
+	}
+
+	cmd->func = imap_filter_more;
+	cmd->context = ctx;
+
+	if (imap_filter_more(cmd))
+		return TRUE;
+
+	/* we may have moved onto syncing by now */
+	if (cmd->func == imap_filter_more) {
+		ctx->to = timeout_add(0, imap_filter_more_callback, cmd);
+		cmd->state = CLIENT_COMMAND_STATE_WAIT_EXTERNAL;
+	}
+	return FALSE;
+}
+
+static bool
+imap_filter_parse_search(struct imap_filter_context *ctx,
+			const struct imap_arg *args)
+{
+	struct client_command_context *cmd = ctx->cmd;
+	struct mail_search_args *sargs;
+	const char *charset;
+	int ret;
+
+	if (imap_arg_atom_equals(args, "CHARSET")) {
+		/* CHARSET specified */
+		if (!imap_arg_get_astring(&args[1], &charset)) {
+			client_send_command_error(cmd,
+				"Invalid charset argument.");
+			imap_filter_context_free(ctx);
+			return TRUE;
+		}
+		args += 2;
+	} else {
+		charset = "UTF-8";
+	}
+
+	ret = imap_search_args_build(cmd, args, charset, &sargs);
+	if (ret <= 0) {
+		imap_filter_context_free(ctx);
+		return ret < 0;
+	}
+
+	return imap_filter_start(ctx, sargs);
+}
+
+bool imap_filter_search(struct client_command_context *cmd)
+{
+	struct imap_filter_context *ctx = cmd->context;
+	const struct imap_arg *args;
+	const char *error;
+	enum imap_parser_error parse_error;
+	int ret;
+
+	ret = imap_parser_read_args(ctx->parser, 0, 0, &args);
+	if (ret < 0) {
+		if (ret == -2)
+			return FALSE;
+		error = imap_parser_get_error(ctx->parser, &parse_error);
+		switch (parse_error) {
+		case IMAP_PARSE_ERROR_NONE:
+			i_unreached();
+		case IMAP_PARSE_ERROR_LITERAL_TOO_BIG:
+			client_disconnect_with_error(ctx->cmd->client, error);
+			break;
+		default:
+			client_send_command_error(ctx->cmd, error);
+			break;
+		}
+		return TRUE;
+	}
+	return imap_filter_parse_search(ctx, args);
+}
+
+int imap_filter_deinit(struct imap_filter_context *ctx)
+{
+	int ret = 0;
+
+	o_stream_set_flush_callback(ctx->cmd->client->output,
+				    client_output, ctx->cmd->client);
+	ctx->cmd->client->input_lock = NULL;
+	imap_parser_unref(&ctx->parser);
+
+	if (ctx->search_ctx != NULL &&
+	    mailbox_search_deinit(&ctx->search_ctx) < 0)
+		ret = -1;
+
+	if (ctx->trans != NULL)
+		(void)mailbox_transaction_commit(&ctx->trans);
+
+	timeout_remove(&ctx->to);
+	if (ctx->sargs != NULL) {
+		mail_search_args_deinit(ctx->sargs);
+		mail_search_args_unref(&ctx->sargs);
+	}
+	imap_filter_context_free(ctx);
+
+	ctx->cmd->context = NULL;
+	return ret;
+}
+
+void imap_filter_context_free(struct imap_filter_context *ctx)
+{
+	imap_filter_sieve_context_free(&ctx->sieve);
+}
+
+
+
diff --git a/pigeonhole/src/plugins/imap-filter-sieve/imap-filter.h b/pigeonhole/src/plugins/imap-filter-sieve/imap-filter.h
new file mode 100644
index 0000000..d504704
--- /dev/null
+++ b/pigeonhole/src/plugins/imap-filter-sieve/imap-filter.h
@@ -0,0 +1,43 @@
+#ifndef IMAP_FILTER_H
+#define IMAP_FILTER_H
+
+struct mail_duplicate_db;
+
+struct sieve_script;
+struct sieve_storage;
+struct sieve_binary;
+
+struct imap_filter_context {
+	struct client_command_context *cmd;
+	struct mailbox *box;
+	struct mailbox_transaction_context *trans;
+	struct mail_search_context *search_ctx;
+
+	struct imap_parser *parser;
+
+	struct imap_filter_sieve_context *sieve;
+	const char *script_name;
+	uoff_t script_len;
+	struct istream *script_input;
+
+	struct mail_search_args *sargs;
+
+	struct timeout *to;
+
+	bool failed:1;
+	bool compile_failure:1;
+	bool have_seqsets:1;
+	bool have_modseqs:1;
+};
+
+bool imap_filter_search(struct client_command_context *cmd);
+
+int imap_filter_deinit(struct imap_filter_context *ctx);
+
+void imap_filter_context_free(struct imap_filter_context *ctx);
+
+/* Commands */
+
+bool cmd_filter(struct client_command_context *cmd);
+
+#endif
diff --git a/pigeonhole/src/plugins/imapsieve/Makefile.am b/pigeonhole/src/plugins/imapsieve/Makefile.am
new file mode 100644
index 0000000..1fea23e
--- /dev/null
+++ b/pigeonhole/src/plugins/imapsieve/Makefile.am
@@ -0,0 +1,40 @@
+imap_moduledir = $(dovecot_moduledir)
+sieve_plugindir = $(dovecot_moduledir)/sieve
+
+imap_module_LTLIBRARIES = lib95_imap_sieve_plugin.la
+sieve_plugin_LTLIBRARIES = lib90_sieve_imapsieve_plugin.la
+
+lib95_imap_sieve_plugin_la_LDFLAGS = -module -avoid-version
+lib90_sieve_imapsieve_plugin_la_LDFLAGS = -module -avoid-version
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib-sieve \
+	-I$(top_srcdir)/src/lib-sieve/util \
+	-I$(top_srcdir)/src/lib-sieve/plugins/environment \
+	$(LIBDOVECOT_IMAP_INCLUDE) \
+	$(LIBDOVECOT_LDA_INCLUDE) \
+	$(LIBDOVECOT_INCLUDE) \
+	-DPKG_RUNDIR=\""$(rundir)"\"
+
+lib95_imap_sieve_plugin_la_SOURCES = \
+	ext-imapsieve.c \
+	ext-imapsieve-environment.c \
+	imap-sieve.c \
+	imap-sieve-storage.c \
+	imap-sieve-plugin.c
+lib95_imap_sieve_plugin_la_LIBADD = \
+	$(top_builddir)/src/lib-sieve/libdovecot-sieve.la
+
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new file mode 100644
index 0000000..648975b
--- /dev/null
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+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/plugins/imapsieve/ext-imapsieve-common.h b/pigeonhole/src/plugins/imapsieve/ext-imapsieve-common.h
new file mode 100644
index 0000000..d3e69cd
--- /dev/null
+++ b/pigeonhole/src/plugins/imapsieve/ext-imapsieve-common.h
@@ -0,0 +1,29 @@
+#ifndef EXT_IMAPSIEVE_COMMON_H
+#define EXT_IMAPSIEVE_COMMON_H
+
+#include "sieve-extensions.h"
+
+#include "imap-sieve.h"
+
+/*
+ * Extensions
+ */
+
+extern const struct sieve_extension_def imapsieve_extension;
+extern const struct sieve_extension_def imapsieve_extension_dummy;
+
+extern const struct sieve_extension_def vnd_imapsieve_extension;
+extern const struct sieve_extension_def vnd_imapsieve_extension_dummy;
+
+/*
+ * Environment items
+ */
+
+void ext_imapsieve_environment_items_register
+	(const struct sieve_extension *ext,
+		const struct sieve_runtime_env *renv);
+void ext_imapsieve_environment_vendor_items_register
+	(const struct sieve_extension *ext,
+		const struct sieve_runtime_env *renv);
+
+#endif
diff --git a/pigeonhole/src/plugins/imapsieve/ext-imapsieve-environment.c b/pigeonhole/src/plugins/imapsieve/ext-imapsieve-environment.c
new file mode 100644
index 0000000..2b61cd4
--- /dev/null
+++ b/pigeonhole/src/plugins/imapsieve/ext-imapsieve-environment.c
@@ -0,0 +1,184 @@
+/* Copyright (c) 2016-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "array.h"
+#include "mail-storage.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-runtime.h"
+
+#include "sieve-ext-environment.h"
+
+#include "ext-imapsieve-common.h"
+
+/*
+ * Environment items
+ */
+
+/* imap.user */
+
+static const char *
+envit_imap_user_get_value(const struct sieve_runtime_env *renv,
+			  const char *name ATTR_UNUSED)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+
+	return eenv->svinst->username;
+}
+
+const struct sieve_environment_item imap_user_env_item = {
+	.name = "imap.user",
+	.get_value = envit_imap_user_get_value
+};
+
+/* imap.email */
+
+static const char *
+envit_imap_email_get_value(const struct sieve_runtime_env *renv,
+			   const char *name ATTR_UNUSED)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	const struct smtp_address *user_email =
+		sieve_get_user_email(eenv->svinst);
+
+	if (user_email == NULL)
+		return NULL;
+	return smtp_address_encode(user_email);
+}
+
+const struct sieve_environment_item imap_email_env_item = {
+	.name = "imap.email",
+	.get_value = envit_imap_email_get_value
+};
+
+/* imap.cause */
+
+static const char *
+envit_imap_cause_get_value(const struct sieve_runtime_env *renv,
+			   const char *name ATTR_UNUSED)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	const struct sieve_script_env *senv = eenv->scriptenv;
+	struct imap_sieve_context *isctx =
+		(struct imap_sieve_context *)senv->script_context;
+
+	return isctx->event.cause;
+}
+
+const struct sieve_environment_item imap_cause_env_item = {
+	.name = "imap.cause",
+	.get_value = envit_imap_cause_get_value
+};
+
+/* imap.mailbox */
+
+static const char *
+envit_imap_mailbox_get_value(const struct sieve_runtime_env *renv,
+			     const char *name ATTR_UNUSED)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	const struct sieve_message_data *msgdata = eenv->msgdata;
+
+	return mailbox_get_vname(msgdata->mail->box);
+}
+
+const struct sieve_environment_item imap_mailbox_env_item = {
+	.name = "imap.mailbox",
+	.get_value = envit_imap_mailbox_get_value
+};
+
+
+/* imap.changedflags */
+
+static const char *
+envit_imap_changedflags_get_value(const struct sieve_runtime_env *renv,
+				  const char *name ATTR_UNUSED)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	const struct sieve_script_env *senv = eenv->scriptenv;
+	struct imap_sieve_context *isctx =
+		(struct imap_sieve_context *)senv->script_context;
+
+	return isctx->event.changed_flags;
+}
+
+const struct sieve_environment_item imap_changedflags_env_item = {
+	.name = "imap.changedflags",
+	.get_value = envit_imap_changedflags_get_value
+};
+
+/* vnd.dovecot.mailbox-from */
+
+static const char *
+envit_vnd_mailbox_from_get_value(const struct sieve_runtime_env *renv,
+				 const char *name ATTR_UNUSED)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	const struct sieve_script_env *senv = eenv->scriptenv;
+	struct imap_sieve_context *isctx =
+		(struct imap_sieve_context *)senv->script_context;
+
+	return mailbox_get_vname(isctx->event.src_mailbox);
+}
+
+const struct sieve_environment_item vnd_mailbox_from_env_item = {
+	.name = "vnd.dovecot.mailbox-from",
+	.get_value = envit_vnd_mailbox_from_get_value
+};
+
+/* vnd.dovecot.mailbox-to */
+
+static const char *
+envit_vnd_mailbox_to_get_value(const struct sieve_runtime_env *renv,
+			       const char *name ATTR_UNUSED)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	const struct sieve_script_env *senv = eenv->scriptenv;
+	struct imap_sieve_context *isctx =
+		(struct imap_sieve_context *)senv->script_context;
+
+	return mailbox_get_vname(isctx->event.dest_mailbox);
+}
+
+const struct sieve_environment_item vnd_mailbox_to_env_item = {
+	.name = "vnd.dovecot.mailbox-to",
+	.get_value = envit_vnd_mailbox_to_get_value
+};
+
+/*
+ * Register
+ */
+
+void ext_imapsieve_environment_items_register(
+	const struct sieve_extension *ext, const struct sieve_runtime_env *renv)
+{
+	const struct sieve_extension *env_ext =
+		(const struct sieve_extension *)ext->context;
+
+	sieve_environment_item_register(env_ext, renv->interp,
+					&imap_user_env_item);
+	sieve_environment_item_register(env_ext, renv->interp,
+					&imap_email_env_item);
+	sieve_environment_item_register(env_ext, renv->interp,
+					&imap_cause_env_item);
+	sieve_environment_item_register(env_ext, renv->interp,
+					&imap_mailbox_env_item);
+	sieve_environment_item_register(env_ext, renv->interp,
+					&imap_changedflags_env_item);
+}
+
+void ext_imapsieve_environment_vendor_items_register
+(const struct sieve_extension *ext, const struct sieve_runtime_env *renv)
+{
+	const struct sieve_extension *env_ext =
+		(const struct sieve_extension *)ext->context;
+
+	sieve_environment_item_register(env_ext, renv->interp,
+					&vnd_mailbox_from_env_item);
+	sieve_environment_item_register(env_ext, renv->interp,
+					&vnd_mailbox_to_env_item);
+}
diff --git a/pigeonhole/src/plugins/imapsieve/ext-imapsieve.c b/pigeonhole/src/plugins/imapsieve/ext-imapsieve.c
new file mode 100644
index 0000000..64dfc07
--- /dev/null
+++ b/pigeonhole/src/plugins/imapsieve/ext-imapsieve.c
@@ -0,0 +1,168 @@
+/* Copyright (c) 2016-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension imapsieve
+ * -------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: RFC 6785
+ * Implementation: full
+ * Status: experimental
+ *
+ */
+
+#include "lib.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-binary.h"
+
+#include "sieve-validator.h"
+#include "sieve-interpreter.h"
+
+#include "sieve-ext-environment.h"
+
+#include "ext-imapsieve-common.h"
+
+/*
+ * Extension
+ */
+
+static bool ext_imapsieve_load
+	(const struct sieve_extension *ext, void **context);
+static bool ext_vnd_imapsieve_load
+	(const struct sieve_extension *ext, void **context);
+static bool ext_vnd_imapsieve_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+
+static bool ext_imapsieve_interpreter_load
+	(const struct sieve_extension *ext,
+		const struct sieve_runtime_env *renv,
+		sieve_size_t *address ATTR_UNUSED);
+
+#ifdef __IMAPSIEVE_DUMMY
+const struct sieve_extension_def imapsieve_extension_dummy = {
+#else
+const struct sieve_extension_def imapsieve_extension = {
+#endif
+	.name = "imapsieve",
+	.load = ext_imapsieve_load,
+	.interpreter_load = ext_imapsieve_interpreter_load
+};
+
+#ifdef __IMAPSIEVE_DUMMY
+const struct sieve_extension_def vnd_imapsieve_extension_dummy = {
+#else
+const struct sieve_extension_def vnd_imapsieve_extension = {
+#endif
+	.name = "vnd.dovecot.imapsieve",
+	.load = ext_vnd_imapsieve_load,
+	.interpreter_load = ext_imapsieve_interpreter_load,
+	.validator_load = ext_vnd_imapsieve_validator_load
+};
+
+/*
+ * Context
+ */
+
+static bool ext_imapsieve_load
+(const struct sieve_extension *ext, void **context)
+{
+	*context = (void*)
+		sieve_ext_environment_require_extension(ext->svinst);
+	return TRUE;
+}
+
+static bool ext_vnd_imapsieve_load
+(const struct sieve_extension *ext, void **context)
+{
+	*context = (void*)sieve_extension_require
+#ifdef __IMAPSIEVE_DUMMY
+		(ext->svinst, &imapsieve_extension_dummy, TRUE);
+#else
+		(ext->svinst, &imapsieve_extension, TRUE);
+#endif
+	return TRUE;
+}
+
+/*
+ * Validator
+ */
+
+static bool ext_vnd_imapsieve_validator_load
+(const struct sieve_extension *ext ATTR_UNUSED,
+	struct sieve_validator *valdtr)
+{
+	const struct sieve_extension *ims_ext;
+
+	/* Load environment extension implicitly */
+
+	ims_ext = sieve_validator_extension_load_implicit
+#ifdef __IMAPSIEVE_DUMMY
+		(valdtr, imapsieve_extension_dummy.name);
+#else
+		(valdtr, imapsieve_extension.name);
+#endif
+	if ( ims_ext == NULL )
+		return FALSE;
+
+	return TRUE;
+}
+
+/*
+ * Interpreter
+ */
+
+static int ext_imapsieve_interpreter_run
+	(const struct sieve_extension *this_ext,
+		const struct sieve_runtime_env *renv,
+		void *context, bool deferred);
+
+const struct sieve_interpreter_extension
+imapsieve_interpreter_extension = {
+#ifdef __IMAPSIEVE_DUMMY
+	.ext_def = &imapsieve_extension_dummy,
+#else
+	.ext_def = &imapsieve_extension,
+#endif
+	.run = ext_imapsieve_interpreter_run
+};
+
+static bool ext_imapsieve_interpreter_load
+(const struct sieve_extension *ext ATTR_UNUSED,
+	const struct sieve_runtime_env *renv,
+	sieve_size_t *address ATTR_UNUSED)
+{
+	sieve_interpreter_extension_register(renv->interp,
+		ext, &imapsieve_interpreter_extension, NULL);
+	return TRUE;
+}
+
+#ifdef __IMAPSIEVE_DUMMY
+static int ext_imapsieve_interpreter_run
+(const struct sieve_extension *ext ATTR_UNUSED,
+	const struct sieve_runtime_env *renv,
+	void *context ATTR_UNUSED, bool deferred)
+{
+	if ( !deferred ) {
+		sieve_runtime_error(renv, NULL,
+			"the imapsieve extension cannot be used outside IMAP");
+	}
+	return SIEVE_EXEC_FAILURE;
+}
+#else
+static int ext_imapsieve_interpreter_run
+(const struct sieve_extension *ext,
+	const struct sieve_runtime_env *renv,
+	void *context ATTR_UNUSED, bool deferred ATTR_UNUSED)
+{
+	if (ext->def == &vnd_imapsieve_extension) {
+		const struct sieve_extension *ims_ext =
+			(const struct sieve_extension *)ext->context;
+		ext_imapsieve_environment_vendor_items_register(ims_ext, renv);
+	} else {
+		ext_imapsieve_environment_items_register(ext, renv);
+	}
+	return SIEVE_EXEC_OK;
+}
+#endif
diff --git a/pigeonhole/src/plugins/imapsieve/imap-sieve-plugin.c b/pigeonhole/src/plugins/imapsieve/imap-sieve-plugin.c
new file mode 100644
index 0000000..0c9b52e
--- /dev/null
+++ b/pigeonhole/src/plugins/imapsieve/imap-sieve-plugin.c
@@ -0,0 +1,60 @@
+/* Copyright (c) 2016-2018 Pigeonhole authors, see the included COPYING file */
+
+#include "imap-common.h"
+#include "str.h"
+
+#include "imap-sieve.h"
+#include "imap-sieve-storage.h"
+
+#include "imap-sieve-plugin.h"
+
+static struct module *imap_sieve_module;
+static imap_client_created_func_t *next_hook_client_created;
+
+/*
+ * Client
+ */
+
+static void imap_sieve_client_created(struct client **clientp)
+{
+	struct client *client = *clientp;
+	struct mail_user *user = client->user;
+	const char *url = NULL;
+
+	if (mail_user_is_plugin_loaded(user, imap_sieve_module)) {
+		url = mail_user_plugin_getenv(user, "imapsieve_url");
+		// FIXME: parse the URL and report error if it is bad
+		if (url != NULL && strncasecmp(url, "sieve:", 6) == 0) {
+			client_add_capability(client, t_strconcat(
+				"IMAPSIEVE=", url, NULL));
+		} else {
+			url = NULL;
+		}
+
+		imap_sieve_storage_client_created(client, (url != NULL));
+	}
+
+	if (next_hook_client_created != NULL)
+		next_hook_client_created(clientp);
+}
+
+/*
+ * Plugin
+ */
+
+const char *imap_sieve_plugin_version = DOVECOT_ABI_VERSION;
+const char imap_sieve_plugin_binary_dependency[] = "imap";
+
+void imap_sieve_plugin_init(struct module *module)
+{
+	imap_sieve_module = module;
+	next_hook_client_created =
+		imap_client_created_hook_set(imap_sieve_client_created);
+	imap_sieve_storage_init(module);
+}
+
+void imap_sieve_plugin_deinit(void)
+{
+	imap_sieve_storage_deinit();
+	imap_client_created_hook_set(next_hook_client_created);
+}
diff --git a/pigeonhole/src/plugins/imapsieve/imap-sieve-plugin.h b/pigeonhole/src/plugins/imapsieve/imap-sieve-plugin.h
new file mode 100644
index 0000000..0271710
--- /dev/null
+++ b/pigeonhole/src/plugins/imapsieve/imap-sieve-plugin.h
@@ -0,0 +1,11 @@
+#ifndef IMAP_SIEVE_PLUGIN_H
+#define IMAP_SIEVE_PLUGIN_H
+
+struct module;
+
+extern const char imap_sieve_plugin_binary_dependency[];
+
+void imap_sieve_plugin_init(struct module *module);
+void imap_sieve_plugin_deinit(void);
+
+#endif
diff --git a/pigeonhole/src/plugins/imapsieve/imap-sieve-storage.c b/pigeonhole/src/plugins/imapsieve/imap-sieve-storage.c
new file mode 100644
index 0000000..f8e5efe
--- /dev/null
+++ b/pigeonhole/src/plugins/imapsieve/imap-sieve-storage.c
@@ -0,0 +1,1273 @@
+/* Copyright (c) 2016-2018 Pigeonhole authors, see the included COPYING file */
+
+#include "imap-common.h"
+#include "array.h"
+#include "hash.h"
+#include "str.h"
+#include "istream.h"
+#include "ostream.h"
+#include "module-context.h"
+#include "mail-user.h"
+#include "mail-storage-private.h"
+#include "mailbox-attribute.h"
+#include "mailbox-list-private.h"
+#include "imap-match.h"
+#include "imap-util.h"
+
+#include "imap-sieve.h"
+#include "imap-sieve-storage.h"
+
+#define MAILBOX_ATTRIBUTE_IMAPSIEVE_SCRIPT "imapsieve/script"
+#define MAIL_SERVER_ATTRIBUTE_IMAPSIEVE_SCRIPT "imapsieve/script"
+
+#define IMAP_SIEVE_USER_CONTEXT(obj) \
+	MODULE_CONTEXT(obj, imap_sieve_user_module)
+#define IMAP_SIEVE_USER_CONTEXT_REQUIRE(obj) \
+	MODULE_CONTEXT_REQUIRE(obj, imap_sieve_user_module)
+#define IMAP_SIEVE_CONTEXT(obj) \
+	MODULE_CONTEXT(obj, imap_sieve_storage_module)
+#define IMAP_SIEVE_CONTEXT_REQUIRE(obj) \
+	MODULE_CONTEXT_REQUIRE(obj, imap_sieve_storage_module)
+#define IMAP_SIEVE_MAIL_CONTEXT(obj) \
+	MODULE_CONTEXT_REQUIRE(obj, imap_sieve_mail_module)
+
+struct imap_sieve_mailbox_rule;
+struct imap_sieve_user;
+struct imap_sieve_mailbox_event;
+struct imap_sieve_mailbox_transaction;
+struct imap_sieve_mail;
+
+enum imap_sieve_command {
+	IMAP_SIEVE_CMD_NONE = 0,
+	IMAP_SIEVE_CMD_APPEND,
+	IMAP_SIEVE_CMD_COPY,
+	IMAP_SIEVE_CMD_MOVE,
+	IMAP_SIEVE_CMD_STORE,
+	IMAP_SIEVE_CMD_OTHER
+};
+
+ARRAY_DEFINE_TYPE(imap_sieve_mailbox_rule,
+	struct imap_sieve_mailbox_rule *);
+ARRAY_DEFINE_TYPE(imap_sieve_mailbox_event,
+	struct imap_sieve_mailbox_event);
+
+HASH_TABLE_DEFINE_TYPE(imap_sieve_mailbox_rule,
+	struct imap_sieve_mailbox_rule *,
+	struct imap_sieve_mailbox_rule *);
+
+struct imap_sieve_mailbox_rule {
+	unsigned int index;
+	const char *mailbox;
+	const char *from;
+	const char *const *causes;
+	const char *before, *after;
+	const char *copy_source_after;
+};
+
+struct imap_sieve_user {
+	union mail_user_module_context module_ctx;
+	struct client *client;
+	struct imap_sieve *isieve;
+
+	enum imap_sieve_command cur_cmd;
+
+	HASH_TABLE_TYPE(imap_sieve_mailbox_rule) mbox_rules;
+	ARRAY_TYPE(imap_sieve_mailbox_rule) mbox_patterns;
+
+	bool sieve_active:1;
+	bool user_script:1;
+	bool expunge_discarded:1;
+};
+
+struct imap_sieve_mailbox_event {
+	uint32_t dest_mail_uid, src_mail_uid;
+	unsigned int save_seq;
+
+	const char *changed_flags;
+};
+
+struct imap_sieve_mailbox_transaction {
+	pool_t pool;
+
+	union mailbox_transaction_module_context module_ctx;
+
+	struct mailbox *src_box;
+	struct mailbox_transaction_context *src_mail_trans;
+
+	ARRAY_TYPE(imap_sieve_mailbox_event) events;
+};
+
+struct imap_sieve_mail {
+	union mail_module_context module_ctx;
+
+	string_t *flags;
+};
+
+static MODULE_CONTEXT_DEFINE_INIT(imap_sieve_user_module,
+				  &mail_user_module_register);
+static MODULE_CONTEXT_DEFINE_INIT(imap_sieve_storage_module,
+				  &mail_storage_module_register);
+static MODULE_CONTEXT_DEFINE_INIT(imap_sieve_mail_module,
+				  &mail_module_register);
+
+static void
+imap_sieve_mailbox_rules_get(struct mail_user *user,
+	struct mailbox *dst_box, struct mailbox *src_box,
+	const char *cause,
+	ARRAY_TYPE(imap_sieve_mailbox_rule) *rules);
+
+/*
+ * Logging
+ */
+
+static inline void
+imap_sieve_debug(struct mail_user *user,
+	const char *format, ...) ATTR_FORMAT(2, 3);
+static inline void
+imap_sieve_debug(struct mail_user *user,
+	const char *format, ...)
+{
+	va_list args;
+
+	if (user->mail_debug) {
+		va_start(args, format);
+		i_debug("imapsieve: %s",
+			t_strdup_vprintf(format, args));
+		va_end(args);
+	}
+}
+
+static inline void
+imap_sieve_warning(struct mail_user *user ATTR_UNUSED,
+	const char *format, ...) ATTR_FORMAT(2, 3);
+static inline void
+imap_sieve_warning(struct mail_user *user ATTR_UNUSED,
+	const char *format, ...)
+{
+	va_list args;
+
+	va_start(args, format);
+	i_warning("imapsieve: %s",
+		t_strdup_vprintf(format, args));
+	va_end(args);
+}
+
+static inline void
+imap_sieve_mailbox_debug(struct mailbox *box,
+	const char *format, ...) ATTR_FORMAT(2, 3);
+static inline void
+imap_sieve_mailbox_debug(struct mailbox *box,
+	const char *format, ...)
+{
+	va_list args;
+
+	if (box->storage->user->mail_debug) {
+		va_start(args, format);
+		i_debug("imapsieve: mailbox %s: %s",
+			mailbox_get_vname(box),
+			t_strdup_vprintf(format, args));
+		va_end(args);
+	}
+}
+
+static inline void
+imap_sieve_mailbox_warning(struct mailbox *box,
+	const char *format, ...) ATTR_FORMAT(2, 3);
+static inline void
+imap_sieve_mailbox_warning(struct mailbox *box,
+	const char *format, ...)
+{
+	va_list args;
+
+	va_start(args, format);
+	i_warning("imapsieve: mailbox %s: %s",
+		mailbox_get_vname(box),
+		t_strdup_vprintf(format, args));
+	va_end(args);
+}
+
+static inline void
+imap_sieve_mailbox_error(struct mailbox *box,
+	const char *format, ...) ATTR_FORMAT(2, 3);
+static inline void
+imap_sieve_mailbox_error(struct mailbox *box,
+	const char *format, ...)
+{
+	va_list args;
+
+	va_start(args, format);
+	i_error("imapsieve: mailbox %s: %s",
+		mailbox_get_vname(box),
+		t_strdup_vprintf(format, args));
+	va_end(args);
+}
+
+/*
+ * Events
+ */
+
+static int imap_sieve_mailbox_get_script_real
+(struct mailbox *box,
+	const char **script_name_r)
+{
+	struct mail_user *user = box->storage->user;
+	struct mail_attribute_value value;
+	int ret;
+
+	*script_name_r = NULL;
+
+	/* get the name of the Sieve script from mailbox METADATA */
+	if ((ret=mailbox_attribute_get(box, MAIL_ATTRIBUTE_TYPE_SHARED,
+			MAILBOX_ATTRIBUTE_IMAPSIEVE_SCRIPT, &value)) < 0) {
+		imap_sieve_mailbox_error(box,
+			"Failed to read /shared/"
+			MAILBOX_ATTRIBUTE_IMAPSIEVE_SCRIPT" "
+			"mailbox attribute: %s",
+			mailbox_get_last_internal_error(box, NULL));
+		return -1;
+	}
+
+	if (ret > 0) {
+		imap_sieve_mailbox_debug(box,
+			"Mailbox attribute /shared/"
+			MAILBOX_ATTRIBUTE_IMAPSIEVE_SCRIPT" "
+			"points to Sieve script `%s'", value.value);
+
+	/* if not found, get the name of the Sieve script from
+	   server METADATA */
+	} else {
+		struct mail_namespace *ns;
+		struct mailbox *inbox;
+
+		imap_sieve_mailbox_debug(box,
+			"Mailbox attribute /shared/"
+			MAILBOX_ATTRIBUTE_IMAPSIEVE_SCRIPT" "
+			"not found");
+
+		ns = mail_namespace_find_inbox(user->namespaces);
+		inbox = mailbox_alloc(ns->list, "INBOX",
+			MAILBOX_FLAG_READONLY);
+		ret = mailbox_attribute_get(inbox,
+			MAIL_ATTRIBUTE_TYPE_SHARED,
+			MAILBOX_ATTRIBUTE_PREFIX_DOVECOT_PVT_SERVER
+			MAILBOX_ATTRIBUTE_IMAPSIEVE_SCRIPT, &value);
+
+		if (ret <= 0) {
+			if (ret < 0) {
+				imap_sieve_mailbox_error(box,
+					"Failed to read /shared/"
+					MAIL_SERVER_ATTRIBUTE_IMAPSIEVE_SCRIPT" "
+					"server attribute: %s",
+					mailbox_get_last_internal_error(inbox, NULL));
+			} else if (ret == 0) {
+				imap_sieve_mailbox_debug(box,
+					"Server attribute /shared/"
+					MAIL_SERVER_ATTRIBUTE_IMAPSIEVE_SCRIPT" "
+					"not found");
+			}
+			mailbox_free(&inbox);
+			return ret;
+		}
+		mailbox_free(&inbox);
+
+		imap_sieve_mailbox_debug(box,
+			"Server attribute /shared/"
+			MAIL_SERVER_ATTRIBUTE_IMAPSIEVE_SCRIPT" "
+			"points to Sieve script `%s'", value.value);
+	}
+
+	*script_name_r = value.value;
+	return 1;
+}
+
+static int imap_sieve_mailbox_get_script
+(struct mailbox *box, const char **script_name_r)
+{
+	int ret;
+
+	ret = imap_sieve_mailbox_get_script_real
+		(box, script_name_r);
+	return ret;
+}
+
+static struct imap_sieve_mailbox_event *
+imap_sieve_create_mailbox_event
+(struct mailbox_transaction_context *t, struct mail *dest_mail)
+{
+	struct imap_sieve_mailbox_transaction *ismt = IMAP_SIEVE_CONTEXT_REQUIRE(t);
+	struct imap_sieve_mailbox_event *event;
+
+	if (!array_is_created(&ismt->events))
+		i_array_init(&ismt->events, 64);
+
+	event = array_append_space(&ismt->events);
+	event->save_seq = t->save_count;
+	event->dest_mail_uid = dest_mail->uid;
+	return event;
+}
+
+static void imap_sieve_add_mailbox_event
+(struct mailbox_transaction_context *t,
+	struct mail *dest_mail, struct mailbox *src_box,
+	const char *changed_flags)
+{
+	struct imap_sieve_mailbox_transaction *ismt = IMAP_SIEVE_CONTEXT_REQUIRE(t);
+	struct imap_sieve_mailbox_event *event;
+
+	i_assert(ismt->src_box == NULL || ismt->src_box == src_box);
+	ismt->src_box = src_box;
+
+	event = imap_sieve_create_mailbox_event(t, dest_mail);
+	event->changed_flags = p_strdup(ismt->pool, changed_flags);
+}
+
+static void imap_sieve_add_mailbox_copy_event
+(struct mailbox_transaction_context *t,
+	struct mail *dest_mail, struct mail *src_mail)
+{
+	struct imap_sieve_mailbox_transaction *ismt = IMAP_SIEVE_CONTEXT_REQUIRE(t);
+	struct imap_sieve_mailbox_event *event;
+
+	i_assert(ismt->src_box == NULL || ismt->src_box == src_mail->box);
+	i_assert(ismt->src_mail_trans == NULL ||
+		ismt->src_mail_trans == src_mail->transaction);
+
+	ismt->src_box = src_mail->box;
+	ismt->src_mail_trans = src_mail->transaction;
+
+	event = imap_sieve_create_mailbox_event(t, dest_mail);
+	event->src_mail_uid = src_mail->uid;
+}
+
+/*
+ * Mail
+ */
+
+static void
+imap_sieve_mail_update_flags(struct mail *_mail,
+	enum modify_type modify_type, enum mail_flags flags)
+{
+	struct mail_private *mail = (struct mail_private *)_mail;
+	struct imap_sieve_mail *ismail = IMAP_SIEVE_MAIL_CONTEXT(mail);
+	enum mail_flags old_flags, new_flags, changed_flags;
+
+	old_flags = mail_get_flags(_mail);
+	ismail->module_ctx.super.update_flags(_mail, modify_type, flags);
+	new_flags = mail_get_flags(_mail);
+
+	changed_flags = old_flags ^ new_flags;
+	if (changed_flags == 0)
+		return;
+
+	if (ismail->flags == NULL)
+		ismail->flags = str_new(default_pool, 64);
+	imap_write_flags(ismail->flags, changed_flags, NULL);
+}
+
+static void
+imap_sieve_mail_update_keywords(struct mail *_mail,
+	enum modify_type modify_type, struct mail_keywords *keywords)
+{
+	struct mail_private *mail = (struct mail_private *)_mail;
+	struct imap_sieve_mail *ismail = IMAP_SIEVE_MAIL_CONTEXT(mail);
+	const char *const *old_keywords, *const *new_keywords;
+	unsigned int i, j;
+
+	old_keywords = mail_get_keywords(_mail);
+	ismail->module_ctx.super.update_keywords(_mail, modify_type, keywords);
+	new_keywords = mail_get_keywords(_mail);
+
+	if (ismail->flags == NULL)
+		ismail->flags = str_new(default_pool, 64);
+
+	/* Removed flags */
+	for (i = 0; old_keywords[i] != NULL; i++) {
+		for (j = 0; new_keywords[j] != NULL; j++) {
+			if (strcmp(old_keywords[i], new_keywords[j]) == 0)
+				break;
+		}
+		if (new_keywords[j] == NULL) {
+			if (str_len(ismail->flags) > 0)
+				str_append_c(ismail->flags, ' ');
+			str_append(ismail->flags, old_keywords[i]);
+		}
+	}
+
+	/* Added flags */
+	for (i = 0; new_keywords[i] != NULL; i++) {
+		for (j = 0; old_keywords[j] != NULL; j++) {
+			if (strcmp(new_keywords[i], old_keywords[j]) == 0)
+				break;
+		}
+		if (old_keywords[j] == NULL) {
+			if (str_len(ismail->flags) > 0)
+				str_append_c(ismail->flags, ' ');
+			str_append(ismail->flags, new_keywords[i]);
+		}
+	}
+}
+
+static void imap_sieve_mail_close(struct mail *_mail)
+{
+	struct mail_private *mail = (struct mail_private *)_mail;
+	struct mailbox_transaction_context *t = _mail->transaction;
+	struct imap_sieve_mail *ismail = IMAP_SIEVE_MAIL_CONTEXT(mail);
+
+	if (ismail->flags != NULL && str_len(ismail->flags) > 0) {
+		if (!_mail->expunged) {
+			imap_sieve_mailbox_debug(_mail->box,
+				"FLAG event (changed flags: %s)",
+				str_c(ismail->flags));
+
+			imap_sieve_add_mailbox_event(t,
+				_mail, _mail->box, str_c(ismail->flags));
+		}
+		str_truncate(ismail->flags, 0);
+	}
+
+	ismail->module_ctx.super.close(_mail);
+}
+
+static void imap_sieve_mail_free(struct mail *_mail)
+{
+	struct mail_private *mail = (struct mail_private *)_mail;
+	struct imap_sieve_mail *ismail = IMAP_SIEVE_MAIL_CONTEXT(mail);
+	string_t *flags = ismail->flags;
+
+	ismail->module_ctx.super.free(_mail);
+
+	if (flags != NULL)
+		str_free(&flags);
+}
+
+static void imap_sieve_mail_allocated(struct mail *_mail)
+{
+	struct mail_private *mail = (struct mail_private *)_mail;
+	struct imap_sieve_mailbox_transaction *ismt =
+		IMAP_SIEVE_CONTEXT(_mail->transaction);
+	struct mail_user *user = _mail->box->storage->user;
+	struct imap_sieve_user *isuser =
+		IMAP_SIEVE_USER_CONTEXT_REQUIRE(user);
+	struct mail_vfuncs *v = mail->vlast;
+	struct imap_sieve_mail *ismail;
+
+	if (ismt == NULL || isuser->sieve_active)
+		return;
+
+	ismail = p_new(mail->pool, struct imap_sieve_mail, 1);
+	ismail->module_ctx.super = *v;
+	mail->vlast = &ismail->module_ctx.super;
+
+	v->close = imap_sieve_mail_close;
+	v->free = imap_sieve_mail_free;
+	v->update_flags = imap_sieve_mail_update_flags;
+	v->update_keywords = imap_sieve_mail_update_keywords;
+	MODULE_CONTEXT_SET(mail, imap_sieve_mail_module, ismail);
+}
+
+/*
+ * Save/copy
+ */
+
+static int
+imap_sieve_mailbox_copy(struct mail_save_context *ctx, struct mail *mail)
+{
+	struct mailbox_transaction_context *t = ctx->transaction;
+	struct mail_storage *storage = t->box->storage;
+	struct mail_user *user = storage->user;
+	struct imap_sieve_user *isuser =
+		IMAP_SIEVE_USER_CONTEXT_REQUIRE(user);
+	union mailbox_module_context *lbox =
+		IMAP_SIEVE_CONTEXT_REQUIRE(t->box);
+	struct imap_sieve_mailbox_transaction *ismt =
+		IMAP_SIEVE_CONTEXT(t);
+
+	if (lbox->super.copy(ctx, mail) < 0)
+		return -1;
+
+	if (ismt != NULL && !isuser->sieve_active &&
+		!ctx->dest_mail->expunged &&
+		(isuser->cur_cmd == IMAP_SIEVE_CMD_COPY ||
+			isuser->cur_cmd == IMAP_SIEVE_CMD_MOVE)) {
+		imap_sieve_mailbox_debug(t->box, "%s event",
+			(isuser->cur_cmd == IMAP_SIEVE_CMD_COPY ?
+				"COPY" : "MOVE"));
+		imap_sieve_add_mailbox_copy_event(t, ctx->dest_mail,
+						  ctx->copy_src_mail);
+	}
+
+	return 0;
+}
+
+static int
+imap_sieve_mailbox_save_finish(struct mail_save_context *ctx)
+{
+	struct mailbox_transaction_context *t = ctx->transaction;
+	struct mailbox *box = t->box;
+	struct imap_sieve_mailbox_transaction *ismt = IMAP_SIEVE_CONTEXT(t);
+	union mailbox_module_context *lbox = IMAP_SIEVE_CONTEXT_REQUIRE(box);
+	struct mail_user *user = box->storage->user;
+	struct imap_sieve_user *isuser = IMAP_SIEVE_USER_CONTEXT_REQUIRE(user);
+	struct mail *dest_mail = ctx->copying_via_save ? NULL : ctx->dest_mail;
+
+	if (lbox->super.save_finish(ctx) < 0)
+		return -1;
+
+	if (ismt != NULL && !isuser->sieve_active &&
+		dest_mail != NULL && !dest_mail->expunged &&
+		isuser->cur_cmd == IMAP_SIEVE_CMD_APPEND) {
+
+		imap_sieve_mailbox_debug(t->box, "APPEND event");
+		imap_sieve_add_mailbox_event(t, dest_mail, box, NULL);
+	}
+	return 0;
+}
+
+/*
+ * Mailbox
+ */
+
+static struct mailbox_transaction_context *
+imap_sieve_mailbox_transaction_begin(struct mailbox *box,
+			 enum mailbox_transaction_flags flags,
+			 const char *reason)
+{
+	union mailbox_module_context *lbox = IMAP_SIEVE_CONTEXT_REQUIRE(box);
+	struct mail_user *user = box->storage->user;
+	struct imap_sieve_user *isuser = 	IMAP_SIEVE_USER_CONTEXT(user);
+	struct mailbox_transaction_context *t;
+	struct imap_sieve_mailbox_transaction *ismt;
+	pool_t pool;
+
+	/* commence parent transaction */
+	t = lbox->super.transaction_begin(box, flags, reason);
+
+	if (isuser == NULL || isuser->sieve_active ||
+		isuser->cur_cmd == IMAP_SIEVE_CMD_NONE)
+		return t;
+
+	i_assert(isuser->client != NULL);
+
+	pool = pool_alloconly_create("imap_sieve_mailbox_transaction", 1024);
+	ismt = p_new(pool, struct imap_sieve_mailbox_transaction, 1);
+	ismt->pool = pool;
+	MODULE_CONTEXT_SET(t, imap_sieve_storage_module, ismt);
+
+	return t;
+}
+
+static void
+imap_sieve_mailbox_transaction_free
+(struct imap_sieve_mailbox_transaction *ismt)
+{
+	if (array_is_created(&ismt->events))
+		array_free(&ismt->events);
+	pool_unref(&ismt->pool);
+}
+
+static void
+imap_sieve_mailbox_run_copy_source(
+	struct imap_sieve_mailbox_transaction *ismt,
+	struct imap_sieve_run *isrun,
+	const struct imap_sieve_mailbox_event *mevent,
+	struct mail **src_mail, bool *fatal_r)
+{
+	struct mailbox *src_box = ismt->src_box;
+	int ret;
+
+	*fatal_r = FALSE;
+
+	if (isrun == NULL)
+		return;
+
+	i_assert(ismt->src_mail_trans->box == src_box);
+	i_assert(mevent->src_mail_uid > 0);
+
+	if (*src_mail == NULL)
+		*src_mail = mail_alloc(ismt->src_mail_trans, 0, NULL);
+
+	/* Select source message */
+	if (!mail_set_uid(*src_mail, mevent->src_mail_uid)) {
+		imap_sieve_mailbox_warning(src_box,
+			"Failed to find source message for Sieve event "
+			"(UID=%llu)", (unsigned long long)mevent->src_mail_uid);
+		return;
+	}
+
+	imap_sieve_mailbox_debug(src_box,
+		"Running copy_source_after scripts.");
+
+	/* Run scripts for source mail */
+	ret = imap_sieve_run_mail(isrun, *src_mail, NULL, fatal_r);
+	if (ret > 0) {
+		/* Discard */
+		mail_update_flags(*src_mail, MODIFY_ADD, MAIL_DELETED);
+	}
+}
+
+static int
+imap_sieve_mailbox_transaction_run(
+	struct imap_sieve_mailbox_transaction *ismt,
+	struct mailbox *dest_box,
+	struct mail_transaction_commit_changes *changes)
+{
+	static const char *wanted_headers[] = {
+		"From", "To", "Message-ID", "Subject", "Return-Path",
+		NULL
+	};
+	struct mailbox *src_box = ismt->src_box;
+	struct mail_user *user = dest_box->storage->user;
+	struct imap_sieve_user *isuser = IMAP_SIEVE_USER_CONTEXT_REQUIRE(user);
+	const struct imap_sieve_mailbox_event *mevent;
+	struct mailbox_header_lookup_ctx *headers_ctx;
+	struct mailbox_transaction_context *st;
+	struct mailbox *sbox;
+	struct imap_sieve_run *isrun, *isrun_src;
+	struct seq_range_iter siter;
+	const char *cause, *script_name = NULL;
+	bool can_discard;
+	struct mail *mail, *src_mail = NULL;
+	int ret;
+
+	if (ismt == NULL || !array_is_created(&ismt->events)) {
+		/* Nothing to do */
+		return 0;
+	}
+
+	i_assert(isuser->client != NULL);
+
+	/* Get user script for this mailbox */
+	if (isuser->user_script && imap_sieve_mailbox_get_script
+		(dest_box, &script_name) < 0) {
+		return 0; // FIXME: some errors may warrant -1
+	}
+
+	/* Make sure IMAPSIEVE is initialized for this user */
+	if (isuser->isieve == NULL)
+		isuser->isieve = imap_sieve_init(isuser->client);
+
+	can_discard = FALSE;
+	switch (isuser->cur_cmd) {
+	case IMAP_SIEVE_CMD_APPEND:
+		cause = "APPEND";
+		can_discard = TRUE;
+		break;
+	case IMAP_SIEVE_CMD_COPY:
+	case IMAP_SIEVE_CMD_MOVE:
+		cause = "COPY";
+		can_discard = TRUE;
+		break;
+	case IMAP_SIEVE_CMD_STORE:
+	case IMAP_SIEVE_CMD_OTHER:
+		cause = "FLAG";
+		break;
+	default:
+		i_unreached();
+	}
+
+	/* Initialize execution */
+	T_BEGIN {
+		ARRAY_TYPE(imap_sieve_mailbox_rule) mbrules;
+		ARRAY_TYPE(const_string) scripts_before, scripts_after;
+		ARRAY_TYPE(const_string) scripts_copy_source;
+		struct imap_sieve_mailbox_rule *rule;
+
+		/* Find matching rules */
+		t_array_init(&mbrules, 16);
+		imap_sieve_mailbox_rules_get
+			(user, dest_box, src_box, cause, &mbrules);
+
+		/* Apply all matched rules */
+		t_array_init(&scripts_before, 8);
+		t_array_init(&scripts_after, 8);
+		t_array_init(&scripts_copy_source, 4);
+		array_foreach_elem(&mbrules, rule) {
+			if (rule->before != NULL)
+				array_append(&scripts_before, &rule->before, 1);
+			if (rule->after != NULL)
+				array_append(&scripts_after, &rule->after, 1);
+			if (rule->copy_source_after != NULL)
+				array_append(&scripts_copy_source, &rule->copy_source_after, 1);
+		}
+		(void)array_append_space(&scripts_before);
+		(void)array_append_space(&scripts_after);
+
+		/* Initialize */
+		ret = imap_sieve_run_init
+			(isuser->isieve, dest_box, src_box, cause, script_name,
+				array_idx(&scripts_before, 0),
+				array_idx(&scripts_after, 0), &isrun);
+
+		/* Initialize source script execution */
+		isrun_src = NULL;
+		if (ret > 0 && ismt->src_mail_trans != NULL &&
+			isuser->cur_cmd == IMAP_SIEVE_CMD_COPY &&
+			array_count(&scripts_copy_source) > 0) {
+			const char *no_scripts = NULL;
+
+			(void)array_append_space(&scripts_copy_source);
+			if (imap_sieve_run_init(isuser->isieve,
+					dest_box, src_box, cause, NULL,
+					&no_scripts, array_idx(&scripts_copy_source, 0),
+					&isrun_src) <= 0)
+				isrun_src = NULL;
+		}
+	} T_END;
+
+	if (ret <= 0) {
+		// FIXME: temp fail should be handled properly
+		return 0;
+	}
+
+	/* Get synchronized view on the destination mailbox */
+	sbox = mailbox_alloc(dest_box->list, dest_box->vname, 0);
+	if (mailbox_sync(sbox, 0) < 0) {
+		mailbox_free(&sbox);
+		imap_sieve_run_deinit(&isrun);
+		if (isrun_src != NULL)
+			imap_sieve_run_deinit(&isrun_src);
+		return -1;
+	}
+
+	/* Create transaction for event messages */
+	st = mailbox_transaction_begin(sbox, 0, __func__);
+	headers_ctx = mailbox_header_lookup_init(sbox, wanted_headers);
+	mail = mail_alloc(st, 0, headers_ctx);
+	mailbox_header_lookup_unref(&headers_ctx);
+
+	/* Iterate through all events */
+	seq_range_array_iter_init(&siter, &changes->saved_uids);
+	array_foreach(&ismt->events, mevent) {
+		uint32_t uid;
+		bool fatal;
+
+		/* Determine UID for saved message */
+		if (mevent->dest_mail_uid > 0)
+			uid = mevent->dest_mail_uid;
+		else if (!seq_range_array_iter_nth(&siter, mevent->save_seq,
+						   &uid)) {
+			/* already gone for some reason */
+			imap_sieve_mailbox_debug(
+				sbox, "Message for Sieve event gone");
+			continue;
+		}
+
+		/* Select event message */
+		i_assert(uid > 0);
+		if (!mail_set_uid(mail, uid) || mail->expunged) {
+			/* already gone for some reason */
+			imap_sieve_mailbox_debug(sbox,
+				"Message for Sieve event gone (UID=%llu)",
+				(unsigned long long)uid);
+			continue;
+		}
+
+		/* Run scripts for this mail */
+		ret = imap_sieve_run_mail(isrun, mail, mevent->changed_flags,
+					  &fatal);
+		if (fatal)
+			break;
+
+		/* Handle the result */
+		if (ret < 0) {
+			/* Sieve error; keep */
+		} else {
+			if (ret <= 0 || !can_discard) {
+				/* Keep */
+			} else if (!isuser->expunge_discarded) {
+				/* Mark as \Deleted */
+				mail_update_flags(mail,
+						  MODIFY_ADD, MAIL_DELETED);
+			} else {
+				/* Expunge */
+				mail_expunge(mail);
+			}
+
+			imap_sieve_mailbox_run_copy_source(
+				ismt, isrun_src, mevent, &src_mail, &fatal);
+			if (fatal)
+				break;
+		}
+	}
+
+	/* Cleanup */
+	mail_free(&mail);
+	ret = mailbox_transaction_commit(&st);
+	if (src_mail != NULL)
+		mail_free(&src_mail);
+	imap_sieve_run_deinit(&isrun);
+	if (isrun_src != NULL)
+		imap_sieve_run_deinit(&isrun_src);
+	mailbox_free(&sbox);
+	return ret;
+}
+
+static int
+imap_sieve_mailbox_transaction_commit(
+	struct mailbox_transaction_context *t,
+	struct mail_transaction_commit_changes *changes_r)
+{
+	struct mailbox *box = t->box;
+	struct mail_user *user = box->storage->user;
+	struct imap_sieve_mailbox_transaction *ismt = IMAP_SIEVE_CONTEXT(t);
+	union mailbox_module_context *lbox = IMAP_SIEVE_CONTEXT_REQUIRE(t->box);
+	struct imap_sieve_user *isuser = IMAP_SIEVE_USER_CONTEXT_REQUIRE(user);
+	int ret = 0;
+
+	if ((lbox->super.transaction_commit(t, changes_r)) < 0)
+		ret = -1;
+	else if (ismt != NULL) {
+		isuser->sieve_active = TRUE;
+		if (imap_sieve_mailbox_transaction_run
+			(ismt, box, changes_r) < 0)
+			ret = -1;
+		isuser->sieve_active = FALSE;
+	}
+
+	if (ismt != NULL)
+		imap_sieve_mailbox_transaction_free(ismt);
+	return ret;
+}
+
+static void
+imap_sieve_mailbox_transaction_rollback(
+	struct mailbox_transaction_context *t)
+{
+	struct imap_sieve_mailbox_transaction *ismt = IMAP_SIEVE_CONTEXT(t);
+	union mailbox_module_context *lbox = IMAP_SIEVE_CONTEXT_REQUIRE(t->box);
+
+	lbox->super.transaction_rollback(t);
+
+	if (ismt != NULL)
+		imap_sieve_mailbox_transaction_free(ismt);
+}
+
+static void imap_sieve_mailbox_allocated(struct mailbox *box)
+{
+	struct mail_user *user = box->storage->user;
+	struct imap_sieve_user *isuser = IMAP_SIEVE_USER_CONTEXT_REQUIRE(user);
+	struct mailbox_vfuncs *v = box->vlast;
+	union mailbox_module_context *lbox;
+
+	if (isuser->client == NULL || isuser->sieve_active ||
+		(box->flags & MAILBOX_FLAG_READONLY) != 0)
+		return;
+
+	lbox = p_new(box->pool, union mailbox_module_context, 1);
+	lbox->super = *v;
+	box->vlast = &lbox->super;
+
+	v->copy = imap_sieve_mailbox_copy;
+	v->save_finish = imap_sieve_mailbox_save_finish;
+	v->transaction_begin = imap_sieve_mailbox_transaction_begin;
+	v->transaction_commit = imap_sieve_mailbox_transaction_commit;
+	v->transaction_rollback = imap_sieve_mailbox_transaction_rollback;
+	MODULE_CONTEXT_SET_SELF(box, imap_sieve_storage_module, lbox);
+}
+
+/*
+ * Mailbox rules
+ */
+
+static unsigned int imap_sieve_mailbox_rule_hash
+(const struct imap_sieve_mailbox_rule *rule)
+{
+	unsigned int hash = str_hash(rule->mailbox);
+
+	if (rule->from != NULL)
+		hash += str_hash(rule->from);
+	return hash;
+}
+
+static int imap_sieve_mailbox_rule_cmp
+(const struct imap_sieve_mailbox_rule *rule1,
+	const struct imap_sieve_mailbox_rule *rule2)
+{
+	int ret;
+
+	if ((ret=strcmp(rule1->mailbox, rule2->mailbox)) != 0)
+		return ret;
+	return null_strcmp(rule1->from, rule2->from);
+}
+
+static bool rule_pattern_has_wildcards(const char *pattern)
+{
+	for (; *pattern != '\0'; pattern++) {
+		if (*pattern == '%' || *pattern == '*')
+			return TRUE;
+	}
+	return FALSE;
+}
+
+static void
+imap_sieve_mailbox_rules_init(struct mail_user *user)
+{
+	struct imap_sieve_user *isuser = IMAP_SIEVE_USER_CONTEXT_REQUIRE(user);
+	string_t *identifier;
+	unsigned int i = 0;
+	size_t prefix_len;
+
+	if (hash_table_is_created(isuser->mbox_rules))
+		return;
+
+	hash_table_create(&isuser->mbox_rules, default_pool, 0,
+		imap_sieve_mailbox_rule_hash, imap_sieve_mailbox_rule_cmp);
+	i_array_init(&isuser->mbox_patterns, 8);
+
+	identifier = t_str_new(256);
+	str_append(identifier, "imapsieve_mailbox");
+	prefix_len = str_len(identifier);
+
+	for (i = 1; ; i++) {
+		struct imap_sieve_mailbox_rule *mbrule;
+		const char *setval;
+		size_t id_len;
+
+		str_truncate(identifier, prefix_len);
+		str_printfa(identifier, "%u", i);
+		id_len = str_len(identifier);
+
+		str_append(identifier, "_name");
+		setval = mail_user_plugin_getenv
+			(user, str_c(identifier));
+		if (setval == NULL || *setval == '\0')
+			break;
+		setval = t_str_trim(setval, "\t ");
+		if (strcasecmp(setval, "INBOX") == 0)
+			setval = t_str_ucase(setval);
+
+		mbrule = p_new(user->pool,
+			struct imap_sieve_mailbox_rule, 1);
+		mbrule->index = i;
+		mbrule->mailbox = p_strdup(user->pool, setval);
+
+		str_truncate(identifier, id_len);
+		str_append(identifier, "_from");
+		setval = mail_user_plugin_getenv(user, str_c(identifier));
+		if (setval != NULL && *setval != '\0') {
+			setval = t_str_trim(setval, "\t ");
+			if (strcasecmp(setval, "INBOX") == 0)
+				setval = t_str_ucase(setval);
+			mbrule->from = p_strdup(user->pool, setval);
+			if (strcmp(mbrule->from, "*") == 0)
+				mbrule->from = NULL;
+		}
+
+		if ((strcmp(mbrule->mailbox, "*") == 0 ||
+				!rule_pattern_has_wildcards(mbrule->mailbox)) &&
+			(mbrule->from == NULL ||
+				!rule_pattern_has_wildcards(mbrule->from)) &&
+			hash_table_lookup(isuser->mbox_rules, mbrule) != NULL) {
+			imap_sieve_warning(user,
+				"Duplicate static mailbox rule [%u] for mailbox `%s' "
+				"(skipped)", i, mbrule->mailbox);
+			continue;
+		}
+
+		str_truncate(identifier, id_len);
+		str_append(identifier, "_causes");
+		setval = mail_user_plugin_getenv(user, str_c(identifier));
+		if (setval != NULL && *setval != '\0') {
+			const char *const *cause;
+
+			mbrule->causes = (const char *const *)
+				p_strsplit_spaces(user->pool, setval, " \t,");
+
+			for (cause = mbrule->causes; *cause != NULL; cause++) {
+				if (!imap_sieve_event_cause_valid(*cause))
+					break;
+			}
+			if (*cause != NULL) {
+				imap_sieve_warning(user,
+					"Static mailbox rule [%u] has invalid event cause `%s' "
+					"(skipped)", i, *cause);
+				continue;
+			}
+		}
+
+		str_truncate(identifier, id_len);
+		str_append(identifier, "_before");
+		setval = mail_user_plugin_getenv(user, str_c(identifier));
+		mbrule->before = p_strdup_empty(user->pool, setval);
+
+		str_truncate(identifier, id_len);
+		str_append(identifier, "_after");
+		setval = mail_user_plugin_getenv(user, str_c(identifier));
+		mbrule->after = p_strdup_empty(user->pool, setval);
+
+		str_truncate(identifier, id_len);
+		str_append(identifier, "_copy_source_after");
+		setval = mail_user_plugin_getenv(user, str_c(identifier));
+		mbrule->copy_source_after = p_strdup_empty(user->pool, setval);
+
+		if (user->mail_debug) {
+			imap_sieve_debug(user, "Static mailbox rule [%u]: "
+				"mailbox=`%s' from=`%s' causes=(%s) => "
+				"before=%s after=%s%s",
+				mbrule->index, mbrule->mailbox,
+				(mbrule->from == NULL ? "*" : mbrule->from),
+				t_strarray_join(mbrule->causes, " "),
+				(mbrule->before == NULL ? "(none)" :
+					t_strconcat("`", mbrule->before, "'", NULL)),
+				(mbrule->after == NULL ? "(none)" :
+					t_strconcat("`", mbrule->after, "'", NULL)),
+				(mbrule->copy_source_after == NULL ? "":
+					t_strconcat(" copy_source_after=`",
+						mbrule->copy_source_after, "'", NULL)));
+		}
+
+		if ((strcmp(mbrule->mailbox, "*") == 0 ||
+				!rule_pattern_has_wildcards(mbrule->mailbox)) &&
+			(mbrule->from == NULL ||
+				!rule_pattern_has_wildcards(mbrule->from))) {
+			hash_table_insert(isuser->mbox_rules, mbrule, mbrule);
+		} else {
+			array_append(&isuser->mbox_patterns, &mbrule, 1);
+		}
+	}
+
+	if (i == 0)
+		imap_sieve_debug(user, "No static mailbox rules");
+}
+
+static bool
+imap_sieve_mailbox_rule_match_cause
+(struct imap_sieve_mailbox_rule *rule, const char *cause)
+{
+	const char *const *cp;
+
+	if (rule->causes == NULL || *rule->causes == NULL)
+		return TRUE;
+
+	for (cp = rule->causes; *cp != NULL; cp++) {
+		if (strcasecmp(cause, *cp) == 0)
+			return TRUE;
+	}
+	return FALSE;
+}
+
+static void
+imap_sieve_mailbox_rules_match_patterns(struct mail_user *user,
+	struct mailbox *dst_box, struct mailbox *src_box,
+	const char *cause,
+	ARRAY_TYPE(imap_sieve_mailbox_rule) *rules)
+{
+	struct imap_sieve_user *isuser = IMAP_SIEVE_USER_CONTEXT_REQUIRE(user);
+	struct imap_sieve_mailbox_rule *rule;
+	struct mail_namespace *dst_ns, *src_ns;
+
+	if (array_count(&isuser->mbox_patterns) == 0)
+		return;
+
+	dst_ns = mailbox_get_namespace(dst_box);
+	src_ns = (src_box == NULL ? NULL :
+		mailbox_get_namespace(src_box));
+
+	array_foreach_elem(&isuser->mbox_patterns, rule) {
+		struct imap_match_glob *glob;
+
+		if (src_ns == NULL && rule->from != NULL)
+			continue;
+		if (!imap_sieve_mailbox_rule_match_cause(rule, cause))
+			continue;
+
+		if (strcmp(rule->mailbox, "*") != 0) {
+			glob = imap_match_init(pool_datastack_create(),
+				rule->mailbox, TRUE, mail_namespace_get_sep(dst_ns));
+			if (imap_match(glob, mailbox_get_vname(dst_box))
+				!= IMAP_MATCH_YES)
+				continue;
+		}
+		if (rule->from != NULL) {
+			glob = imap_match_init(pool_datastack_create(),
+				rule->from, TRUE, mail_namespace_get_sep(src_ns));
+			if (imap_match(glob, mailbox_get_vname(src_box))
+				!= IMAP_MATCH_YES)
+				continue;
+		}
+
+		imap_sieve_debug(user,
+			"Matched static mailbox rule [%u]",
+			rule->index);
+		array_append(rules, &rule, 1);
+	}
+}
+
+static void
+imap_sieve_mailbox_rules_match(struct mail_user *user,
+	const char *dst_box, const char *src_box,
+	const char *cause,
+	ARRAY_TYPE(imap_sieve_mailbox_rule) *rules)
+{
+	struct imap_sieve_user *isuser = IMAP_SIEVE_USER_CONTEXT_REQUIRE(user);
+	struct imap_sieve_mailbox_rule lookup_rule;
+	struct imap_sieve_mailbox_rule *rule;
+
+	i_zero(&lookup_rule);
+	lookup_rule.mailbox = dst_box;
+	lookup_rule.from = src_box;
+	rule = hash_table_lookup(isuser->mbox_rules, &lookup_rule);
+
+	if (rule != NULL &&
+		imap_sieve_mailbox_rule_match_cause(rule, cause)) {
+		struct imap_sieve_mailbox_rule *const *rule_idx;
+		unsigned int insert_idx = array_count(rules);
+
+		/* Insert sorted by rule index */
+		array_foreach(rules, rule_idx) {
+			if (rule->index < (*rule_idx)->index) {
+				insert_idx = array_foreach_idx(rules, rule_idx);
+				break;
+			}
+		}
+		array_insert(rules, insert_idx, &rule, 1);
+
+		imap_sieve_debug(user,
+			"Matched static mailbox rule [%u]",
+			rule->index);
+	}
+}
+
+static void
+imap_sieve_mailbox_rules_get(struct mail_user *user,
+	struct mailbox *dst_box, struct mailbox *src_box,
+	const char *cause,
+	ARRAY_TYPE(imap_sieve_mailbox_rule) *rules)
+{
+	const char *dst_name, *src_name;
+
+	imap_sieve_mailbox_rules_init(user);
+
+	imap_sieve_mailbox_rules_match_patterns
+		(user, dst_box, src_box, cause, rules);
+
+	dst_name = mailbox_get_vname(dst_box);
+	src_name = (src_box == NULL ? NULL :
+		mailbox_get_vname(src_box));
+
+	imap_sieve_mailbox_rules_match
+		(user, dst_name, src_name, cause, rules);
+	imap_sieve_mailbox_rules_match
+		(user, "*", src_name, cause, rules);
+	if (src_name != NULL) {
+		imap_sieve_mailbox_rules_match
+			(user, dst_name, NULL, cause, rules);
+		imap_sieve_mailbox_rules_match
+			(user, "*", NULL, cause, rules);
+	}
+}
+
+/*
+ * User
+ */
+
+static void imap_sieve_user_deinit(struct mail_user *user)
+{
+	struct imap_sieve_user *isuser = IMAP_SIEVE_USER_CONTEXT_REQUIRE(user);
+
+	if (isuser->isieve != NULL)
+		imap_sieve_deinit(&isuser->isieve);
+
+	hash_table_destroy(&isuser->mbox_rules);
+	if (array_is_created(&isuser->mbox_patterns))
+		array_free(&isuser->mbox_patterns);
+
+	isuser->module_ctx.super.deinit(user);
+}
+
+static void imap_sieve_user_created(struct mail_user *user)
+{
+	struct imap_sieve_user *isuser;
+	struct mail_user_vfuncs *v = user->vlast;
+
+	isuser = p_new(user->pool, struct imap_sieve_user, 1);
+	isuser->module_ctx.super = *v;
+	user->vlast = &isuser->module_ctx.super;
+	v->deinit = imap_sieve_user_deinit;
+	MODULE_CONTEXT_SET(user, imap_sieve_user_module, isuser);
+}
+
+/*
+ * Hooks
+ */
+
+static struct mail_storage_hooks imap_sieve_mail_storage_hooks = {
+	.mail_user_created = imap_sieve_user_created,
+	.mailbox_allocated = imap_sieve_mailbox_allocated,
+	.mail_allocated = imap_sieve_mail_allocated
+};
+
+/*
+ * Commands
+ */
+
+static void imap_sieve_command_pre(struct client_command_context *cmd)
+{
+	struct client *client = cmd->client;
+	struct mail_user *user = client->user;
+	struct imap_sieve_user *isuser = 	IMAP_SIEVE_USER_CONTEXT(user);
+
+	if (isuser == NULL)
+		return;
+
+	if (strcasecmp(cmd->name, "APPEND") == 0) {
+		isuser->cur_cmd = IMAP_SIEVE_CMD_APPEND;
+	} else 	if (strcasecmp(cmd->name, "COPY") == 0 ||
+		strcasecmp(cmd->name, "UID COPY") == 0) {
+		isuser->cur_cmd = IMAP_SIEVE_CMD_COPY;
+	} else 	if (strcasecmp(cmd->name, "MOVE") == 0 ||
+		strcasecmp(cmd->name, "UID MOVE") == 0) {
+		isuser->cur_cmd = IMAP_SIEVE_CMD_MOVE;
+	} else 	if (strcasecmp(cmd->name, "STORE") == 0 ||
+		strcasecmp(cmd->name, "UID STORE") == 0) {
+		isuser->cur_cmd = IMAP_SIEVE_CMD_STORE;
+	} else {
+		isuser->cur_cmd = IMAP_SIEVE_CMD_OTHER;
+	}
+}
+
+static void imap_sieve_command_post(struct client_command_context *cmd)
+{
+	struct client *client = cmd->client;
+	struct mail_user *user = client->user;
+	struct imap_sieve_user *isuser = 	IMAP_SIEVE_USER_CONTEXT(user);
+
+	if (isuser == NULL)
+		return;
+	isuser->cur_cmd = IMAP_SIEVE_CMD_NONE;
+}
+
+/*
+ * Client
+ */
+
+void imap_sieve_storage_client_created(struct client *client,
+	bool user_script)
+{
+	struct mail_user *user = client->user;
+	struct imap_sieve_user *isuser = IMAP_SIEVE_USER_CONTEXT_REQUIRE(user);
+	const char *set;
+
+	isuser->client = client;
+	isuser->user_script = user_script;
+
+	set = mail_user_plugin_getenv(user, "imapsieve_expunge_discarded");
+	isuser->expunge_discarded =
+		(set != NULL && strcasecmp(set, "yes") == 0);
+}
+
+/*
+ *
+ */
+
+void imap_sieve_storage_init(struct module *module)
+{
+	command_hook_register(imap_sieve_command_pre, imap_sieve_command_post);
+	mail_storage_hooks_add(module, &imap_sieve_mail_storage_hooks);
+}
+
+void imap_sieve_storage_deinit(void)
+{
+	mail_storage_hooks_remove(&imap_sieve_mail_storage_hooks);
+	command_hook_unregister(imap_sieve_command_pre, imap_sieve_command_post);
+}
diff --git a/pigeonhole/src/plugins/imapsieve/imap-sieve-storage.h b/pigeonhole/src/plugins/imapsieve/imap-sieve-storage.h
new file mode 100644
index 0000000..f96860f
--- /dev/null
+++ b/pigeonhole/src/plugins/imapsieve/imap-sieve-storage.h
@@ -0,0 +1,10 @@
+#ifndef IMAP_SIEVE_STORAGE_H
+#define IMAP_SIEVE_STORAGE_H
+
+void imap_sieve_storage_init(struct module *module);
+void imap_sieve_storage_deinit(void);
+
+void imap_sieve_storage_client_created(struct client *client,
+	bool user_script);
+
+#endif
diff --git a/pigeonhole/src/plugins/imapsieve/imap-sieve.c b/pigeonhole/src/plugins/imapsieve/imap-sieve.c
new file mode 100644
index 0000000..e6cc24a
--- /dev/null
+++ b/pigeonhole/src/plugins/imapsieve/imap-sieve.c
@@ -0,0 +1,940 @@
+/* Copyright (c) 2016-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "home-expand.h"
+#include "smtp-address.h"
+#include "smtp-submit.h"
+#include "mail-storage.h"
+#include "mail-user.h"
+#include "mail-duplicate.h"
+#include "iostream-ssl.h"
+#include "imap-client.h"
+#include "imap-settings.h"
+
+#include "sieve.h"
+#include "sieve-script.h"
+#include "sieve-storage.h"
+
+#include "ext-imapsieve-common.h"
+
+#include "imap-sieve.h"
+
+/*
+ * Configuration
+ */
+
+#define DUPLICATE_DB_NAME "lda-dupes"
+#define IMAP_SIEVE_MAX_USER_ERRORS 30
+
+/*
+ * IMAP Sieve
+ */
+
+struct imap_sieve {
+	pool_t pool;
+	struct client *client;
+	const char *home_dir;
+
+	struct sieve_instance *svinst;
+	struct sieve_storage *storage;
+
+	const struct sieve_extension *ext_imapsieve;
+	const struct sieve_extension *ext_vnd_imapsieve;
+
+	struct mail_duplicate_db *dup_db;
+
+	struct sieve_error_handler *master_ehandler;
+};
+
+static const char *
+mail_sieve_get_setting(void *context, const char *identifier)
+{
+	struct imap_sieve *isieve = context;
+	struct mail_user *user = isieve->client->user;
+
+	return mail_user_plugin_getenv(user, identifier);
+}
+
+static const struct sieve_callbacks mail_sieve_callbacks = {
+	NULL,
+	mail_sieve_get_setting
+};
+
+struct imap_sieve *imap_sieve_init(struct client *client)
+{
+	struct sieve_environment svenv;
+	struct imap_sieve *isieve;
+	struct mail_user *user = client->user;
+	const struct mail_storage_settings *mail_set =
+		mail_user_set_get_storage_set(user);
+	bool debug = user->mail_debug;
+	pool_t pool;
+
+	pool = pool_alloconly_create("imap_sieve", 256);
+	isieve = p_new(pool, struct imap_sieve, 1);
+	isieve->pool = pool;
+	isieve->client = client;
+
+	isieve->dup_db = mail_duplicate_db_init(user, DUPLICATE_DB_NAME);
+
+	i_zero(&svenv);
+	svenv.username = user->username;
+	(void)mail_user_get_home(user, &svenv.home_dir);
+	svenv.hostname = mail_set->hostname;
+	svenv.base_dir = user->set->base_dir;
+	svenv.event_parent = client->event;
+	svenv.flags = SIEVE_FLAG_HOME_RELATIVE;
+	svenv.location = SIEVE_ENV_LOCATION_MS;
+	svenv.delivery_phase = SIEVE_DELIVERY_PHASE_POST;
+
+	isieve->home_dir = p_strdup(pool, svenv.home_dir);
+
+	isieve->svinst = sieve_init(&svenv, &mail_sieve_callbacks, isieve,
+				    debug);
+
+	isieve->ext_imapsieve = sieve_extension_replace(
+		isieve->svinst, &imapsieve_extension, TRUE);
+	isieve->ext_vnd_imapsieve = sieve_extension_replace(
+		isieve->svinst, &vnd_imapsieve_extension, TRUE);
+
+	isieve->master_ehandler =
+		sieve_master_ehandler_create(isieve->svinst, 0);
+	sieve_error_handler_accept_infolog(isieve->master_ehandler, TRUE);
+	sieve_error_handler_accept_debuglog(isieve->master_ehandler, debug);
+
+	return isieve;
+}
+
+void imap_sieve_deinit(struct imap_sieve **_isieve)
+{
+	struct imap_sieve *isieve = *_isieve;
+
+	*_isieve = NULL;
+
+	sieve_error_handler_unref(&isieve->master_ehandler);
+
+	if (isieve->storage != NULL)
+		sieve_storage_unref(&isieve->storage);
+	sieve_extension_unregister(isieve->ext_imapsieve);
+	sieve_extension_unregister(isieve->ext_vnd_imapsieve);
+	sieve_deinit(&isieve->svinst);
+
+	mail_duplicate_db_deinit(&isieve->dup_db);
+
+	pool_unref(&isieve->pool);
+}
+
+static int
+imap_sieve_get_storage(struct imap_sieve *isieve,
+		       struct sieve_storage **storage_r)
+{
+	enum sieve_storage_flags storage_flags = 0;
+	struct mail_user *user = isieve->client->user;
+	enum sieve_error error;
+
+	if (isieve->storage != NULL) {
+		*storage_r = isieve->storage;
+		return 1;
+	}
+
+	// FIXME: limit interval between retries
+
+	isieve->storage = sieve_storage_create_main(isieve->svinst, user,
+						    storage_flags, &error);
+	if (isieve->storage == NULL) {
+		if (error == SIEVE_ERROR_TEMP_FAILURE)
+			return -1;
+		return 0;
+	}
+	*storage_r = isieve->storage;
+	return 1;
+}
+
+/*
+ * Mail transmission
+ */
+
+static void *
+imap_sieve_smtp_start(const struct sieve_script_env *senv,
+		      const struct smtp_address *mail_from)
+{
+	struct imap_sieve_context *isctx = senv->script_context;
+	struct imap_sieve *isieve = isctx->isieve;
+	struct mail_user *user = isieve->client->user;
+	const struct smtp_submit_settings *smtp_set = isieve->client->smtp_set;
+	struct ssl_iostream_settings ssl_set;
+	struct smtp_submit_input submit_input;
+	
+	i_zero(&ssl_set);
+	mail_user_init_ssl_client_settings(user, &ssl_set);
+
+	i_zero(&submit_input);
+	submit_input.ssl = &ssl_set;
+
+	return smtp_submit_init_simple(&submit_input, smtp_set, mail_from);
+}
+
+static void
+imap_sieve_smtp_add_rcpt(const struct sieve_script_env *senv ATTR_UNUSED,
+			 void *handle, const struct smtp_address *rcpt_to)
+{
+	struct smtp_submit *smtp_submit = handle;
+
+	smtp_submit_add_rcpt(smtp_submit, rcpt_to);
+}
+
+static struct ostream *
+imap_sieve_smtp_send(const struct sieve_script_env *senv ATTR_UNUSED,
+		     void *handle)
+{
+	struct smtp_submit *smtp_submit = handle;
+
+	return smtp_submit_send(smtp_submit);
+}
+
+static void
+imap_sieve_smtp_abort(const struct sieve_script_env *senv ATTR_UNUSED,
+		      void *handle)
+{
+	struct smtp_submit *smtp_submit = handle;
+
+	smtp_submit_deinit(&smtp_submit);
+}
+
+static int
+imap_sieve_smtp_finish(const struct sieve_script_env *senv ATTR_UNUSED,
+		       void *handle, const char **error_r)
+{
+	struct smtp_submit *smtp_submit = handle;
+	int ret;
+
+	ret = smtp_submit_run(smtp_submit, error_r);
+	smtp_submit_deinit(&smtp_submit);
+	return ret;
+}
+
+/*
+ * Duplicate checking
+ */
+
+static void *
+imap_sieve_duplicate_transaction_begin(const struct sieve_script_env *senv)
+{
+	struct imap_sieve_context *isctx = senv->script_context;
+
+	return mail_duplicate_transaction_begin(isctx->isieve->dup_db);
+}
+
+static void imap_sieve_duplicate_transaction_commit(void **_dup_trans)
+{
+	struct mail_duplicate_transaction *dup_trans = *_dup_trans;
+
+	*_dup_trans = NULL;
+	mail_duplicate_transaction_commit(&dup_trans);
+}
+
+static void imap_sieve_duplicate_transaction_rollback(void **_dup_trans)
+{
+	struct mail_duplicate_transaction *dup_trans = *_dup_trans;
+
+	*_dup_trans = NULL;
+	mail_duplicate_transaction_rollback(&dup_trans);
+}
+
+static enum sieve_duplicate_check_result
+imap_sieve_duplicate_check(void *_dup_trans,
+			   const struct sieve_script_env *senv,
+			   const void *id, size_t id_size)
+{
+	struct mail_duplicate_transaction *dup_trans = _dup_trans;
+
+	switch (mail_duplicate_check(dup_trans, id, id_size,
+				     senv->user->username)) {
+	case MAIL_DUPLICATE_CHECK_RESULT_EXISTS:
+		return SIEVE_DUPLICATE_CHECK_RESULT_EXISTS;
+	case MAIL_DUPLICATE_CHECK_RESULT_NOT_FOUND:
+		return SIEVE_DUPLICATE_CHECK_RESULT_NOT_FOUND;
+	case MAIL_DUPLICATE_CHECK_RESULT_DEADLOCK:
+	case MAIL_DUPLICATE_CHECK_RESULT_LOCK_TIMEOUT:
+		return SIEVE_DUPLICATE_CHECK_RESULT_TEMP_FAILURE;
+	case MAIL_DUPLICATE_CHECK_RESULT_IO_ERROR:
+	case MAIL_DUPLICATE_CHECK_RESULT_TOO_MANY_LOCKS:
+		break;
+	}
+	return SIEVE_DUPLICATE_CHECK_RESULT_FAILURE;
+}
+
+static void
+imap_sieve_duplicate_mark(void *_dup_trans, const struct sieve_script_env *senv,
+			  const void *id, size_t id_size, time_t time)
+{
+	struct mail_duplicate_transaction *dup_trans = _dup_trans;
+
+	mail_duplicate_mark(dup_trans, id, id_size, senv->user->username, time);
+}
+
+/*
+ * Result logging
+ */
+
+static const char *
+imap_sieve_result_amend_log_message(const struct sieve_script_env *senv,
+				    enum log_type log_type ATTR_UNUSED,
+				    const char *message)
+{
+	struct imap_sieve_context *isctx = senv->script_context;
+	string_t *str;
+
+	if (isctx->mail == NULL)
+		return message;
+
+	str = t_str_new(256);
+	str_printfa(str, "uid=%u: ", isctx->mail->uid);
+	str_append(str, message);
+	return str_c(str);
+}
+
+/*
+ * IMAP Sieve run
+ */
+
+struct imap_sieve_run_script {
+	struct sieve_script *script;
+	struct sieve_binary *binary;
+
+	/* Compile failed once with this error;
+	   don't try again for this transaction */
+	enum sieve_error compile_error;
+
+	/* Binary corrupt after recompile; don't recompile again */
+	bool binary_corrupt:1;
+	/* Resource usage exceeded */
+	bool rusage_exceeded:1;
+};
+
+struct imap_sieve_run {
+	pool_t pool;
+	struct imap_sieve *isieve;
+	struct mailbox *dest_mailbox, *src_mailbox;
+	char *cause;
+
+	struct sieve_error_handler *user_ehandler;
+	char *userlog;
+
+	struct sieve_trace_config trace_config;
+	struct sieve_trace_log *trace_log;
+
+	struct sieve_script *user_script;
+	struct imap_sieve_run_script *scripts;
+	unsigned int scripts_count;
+
+	bool trace_log_initialized:1;
+};
+
+static void
+imap_sieve_run_init_user_log(struct imap_sieve_run *isrun)
+{
+	struct imap_sieve *isieve = isrun->isieve;
+	struct sieve_instance *svinst = isieve->svinst;
+	const char *log_path;
+
+	log_path = sieve_user_get_log_path(svinst, isrun->user_script);
+	if (log_path != NULL) {
+		isrun->userlog = p_strdup(isrun->pool, log_path);
+		isrun->user_ehandler = sieve_logfile_ehandler_create(
+			svinst, log_path, IMAP_SIEVE_MAX_USER_ERRORS);
+	}
+}
+
+static void
+imap_sieve_run_init_trace_log(struct imap_sieve_run *isrun,
+			      struct sieve_trace_config *trace_config_r,
+			      struct sieve_trace_log **trace_log_r)
+{
+	struct imap_sieve *isieve = isrun->isieve;
+	struct sieve_instance *svinst = isieve->svinst;
+	struct mail_user *user = isieve->client->user;
+
+	if (isrun->trace_log_initialized) {
+		*trace_config_r = isrun->trace_config;
+		*trace_log_r = isrun->trace_log;
+		return;
+	}
+	isrun->trace_log_initialized = TRUE;
+
+	if (sieve_trace_config_get(svinst, &isrun->trace_config) < 0 ||
+	    sieve_trace_log_open(svinst, &isrun->trace_log) < 0) {
+		i_zero(&isrun->trace_config);
+		isrun->trace_log = NULL;
+
+		i_zero(trace_config_r);
+		*trace_log_r = NULL;
+		return;
+	}
+
+	/* Write header for trace file */
+	sieve_trace_log_printf(isrun->trace_log,
+		"Sieve trace log for IMAPSIEVE:\n"
+		"\n"
+		"  Username: %s\n", user->username);
+	if (user->session_id != NULL) {
+		sieve_trace_log_printf(isrun->trace_log,
+			"  Session ID: %s\n", user->session_id);
+	}
+	if (isrun->src_mailbox != NULL) {
+		sieve_trace_log_printf(isrun->trace_log,
+				       "  Source mailbox: %s\n",
+				       mailbox_get_vname(isrun->src_mailbox));
+	}
+
+	sieve_trace_log_printf(isrun->trace_log,
+		"  Destination mailbox: %s\n"
+		"  Cause: %s\n\n",
+		mailbox_get_vname(isrun->dest_mailbox),
+		isrun->cause);
+
+	*trace_config_r = isrun->trace_config;
+	*trace_log_r = isrun->trace_log;
+}
+
+int imap_sieve_run_init(struct imap_sieve *isieve,
+			struct mailbox *dest_mailbox,
+			struct mailbox *src_mailbox,
+			const char *cause, const char *script_name,
+			const char *const *scripts_before,
+			const char *const *scripts_after,
+			struct imap_sieve_run **isrun_r)
+{
+	struct sieve_instance *svinst = isieve->svinst;
+	struct imap_sieve_run *isrun;
+	struct sieve_storage *storage;
+	struct imap_sieve_run_script *scripts;
+	struct sieve_script *user_script;
+	const char *const *sp;
+	enum sieve_error error;
+	pool_t pool;
+	unsigned int max_len, count;
+	int ret;
+
+	/* Determine how many scripts we may run for this event */
+	max_len = 0;
+	if (scripts_before != NULL)
+		max_len += str_array_length(scripts_before);
+	if (script_name != NULL)
+		max_len++;
+	if (scripts_after != NULL)
+		max_len += str_array_length(scripts_after);
+	if (max_len == 0)
+		return 0;
+
+	/* Get storage for user script */
+	storage = NULL;
+	if (script_name != NULL && *script_name != '\0' &&
+	    (ret = imap_sieve_get_storage(isieve, &storage)) < 0)
+		return ret;
+
+	/* Open all scripts */
+	count = 0;
+	pool = pool_alloconly_create("imap_sieve_run", 256);
+	scripts = p_new(pool, struct imap_sieve_run_script, max_len);
+
+	/* Admin scripts before user script */
+	if (scripts_before != NULL) {
+		for (sp = scripts_before; *sp != NULL; sp++) {
+			i_assert(count < max_len);
+			scripts[count].script =
+				sieve_script_create_open(svinst, *sp, NULL,
+							 &error);
+			if (scripts[count].script != NULL)
+				count++;
+			else if (error == SIEVE_ERROR_TEMP_FAILURE)
+				return -1;
+		}
+	}
+
+	/* The user script */
+	user_script = NULL;
+	if (storage != NULL) {
+		i_assert(count < max_len);
+		scripts[count].script =
+			sieve_storage_open_script(storage, script_name, &error);
+		if (scripts[count].script != NULL) {
+			user_script = scripts[count].script;
+			count++;
+		} else if (error == SIEVE_ERROR_TEMP_FAILURE) {
+			return -1;
+		}
+	}
+
+	/* Admin scripts after user script */
+	if (scripts_after != NULL) {
+		for (sp = scripts_after; *sp != NULL; sp++) {
+			i_assert(count < max_len);
+			scripts[count].script =
+				sieve_script_create_open(svinst, *sp, NULL,
+							 &error);
+			if (scripts[count].script != NULL)
+				count++;
+			else if (error == SIEVE_ERROR_TEMP_FAILURE)
+				return -1;
+		}
+	}
+
+	if (count == 0) {
+		/* None of the scripts could be opened */
+		pool_unref(&pool);
+		return 0;
+	}
+
+	/* Initialize */
+	isrun = p_new(pool, struct imap_sieve_run, 1);
+	isrun->pool = pool;
+	isrun->isieve = isieve;
+	isrun->dest_mailbox = dest_mailbox;
+	isrun->src_mailbox = src_mailbox;
+	isrun->cause = p_strdup(pool, cause);
+	isrun->user_script = user_script;
+	isrun->scripts = scripts;
+	isrun->scripts_count = count;
+
+	imap_sieve_run_init_user_log(isrun);
+
+	*isrun_r = isrun;
+	return 1;
+}
+
+void imap_sieve_run_deinit(struct imap_sieve_run **_isrun)
+{
+	struct imap_sieve_run *isrun = *_isrun;
+	unsigned int i;
+
+	*_isrun = NULL;
+
+	for (i = 0; i < isrun->scripts_count; i++) {
+		if (isrun->scripts[i].binary != NULL)
+			sieve_close(&isrun->scripts[i].binary);
+		if (isrun->scripts[i].script != NULL)
+			sieve_script_unref(&isrun->scripts[i].script);
+	}
+	if (isrun->user_ehandler != NULL)
+		sieve_error_handler_unref(&isrun->user_ehandler);
+	if (isrun->trace_log != NULL)
+		sieve_trace_log_free(&isrun->trace_log);
+
+	pool_unref(&isrun->pool);
+}
+
+static struct sieve_binary *
+imap_sieve_run_open_script(struct imap_sieve_run *isrun,
+			   struct sieve_script *script,
+			   enum sieve_compile_flags cpflags,
+			   bool recompile, enum sieve_error *error_r)
+{
+	struct imap_sieve *isieve = isrun->isieve;
+	struct sieve_instance *svinst = isieve->svinst;
+	struct sieve_error_handler *ehandler;
+	struct sieve_binary *sbin;
+	const char *compile_name = "compile";
+
+	if (recompile) {
+		/* Warn */
+		e_warning(sieve_get_event(svinst),
+			  "Encountered corrupt binary: re-compiling script %s",
+			  sieve_script_location(script));
+		compile_name = "re-compile";
+	} else {
+		e_debug(sieve_get_event(svinst),
+			"Loading script %s", sieve_script_location(script));
+	}
+
+	if (script == isrun->user_script)
+		ehandler = isrun->user_ehandler;
+	else
+		ehandler = isieve->master_ehandler;
+	sieve_error_handler_reset(ehandler);
+
+	/* Load or compile the sieve script */
+	if (recompile) {
+		sbin = sieve_compile_script(script, ehandler, cpflags, error_r);
+	} else {
+		sbin = sieve_open_script(script, ehandler, cpflags, error_r);
+	}
+
+	/* Handle error */
+	if (sbin == NULL) {
+		switch (*error_r) {
+		/* Script not found */
+		case SIEVE_ERROR_NOT_FOUND:
+			e_debug(sieve_get_event(svinst),
+				"Script `%s' is missing for %s",
+				sieve_script_location(script), compile_name);
+			break;
+		/* Temporary failure */
+		case SIEVE_ERROR_TEMP_FAILURE:
+			e_error(sieve_get_event(svinst),
+				"Failed to open script `%s' for %s "
+				"(temporary failure)",
+				sieve_script_location(script), compile_name);
+			break;
+		/* Compile failed */
+		case SIEVE_ERROR_NOT_VALID:
+			if (script == isrun->user_script &&
+			   isrun->userlog != NULL ) {
+				e_info(sieve_get_event(svinst),
+				       "Failed to %s script `%s' "
+				       "(view user logfile `%s' for more information)",
+				       compile_name, sieve_script_location(script),
+				       isrun->userlog);
+				break;
+			}
+			e_error(sieve_get_event(svinst),
+				"Failed to %s script `%s'",
+				compile_name, sieve_script_location(script));
+			break;
+		/* Cumulative resource limit exceeded */
+		case SIEVE_ERROR_RESOURCE_LIMIT:
+			e_error(sieve_get_event(svinst),
+				"Failed to open script `%s' for %s "
+				"(cumulative resource limit exceeded)",
+				sieve_script_location(script), compile_name);
+			break;
+		/* Something else */
+		default:
+			e_error(sieve_get_event(svinst),
+				"Failed to open script `%s' for %s",
+				sieve_script_location(script), compile_name);
+			break;
+		}
+
+		return NULL;
+	}
+
+	if (!recompile)
+		(void)sieve_save(sbin, FALSE, NULL);
+	return sbin;
+}
+
+static int
+imap_sieve_handle_exec_status(struct imap_sieve_run *isrun,
+			      struct sieve_script *script, int status,
+			      struct sieve_exec_status *estatus, bool *fatal_r)
+			      ATTR_NULL(2)
+{
+	struct imap_sieve *isieve = isrun->isieve;
+	struct sieve_instance *svinst = isieve->svinst;
+	const char *userlog_notice = "";
+	enum log_type log_level, user_log_level;
+	enum mail_error mail_error = MAIL_ERROR_NONE;
+	int ret = -1;
+
+	*fatal_r = FALSE;
+
+	log_level = user_log_level = LOG_TYPE_ERROR;
+
+	if (estatus->last_storage != NULL && estatus->store_failed) {
+		mail_storage_get_last_error(estatus->last_storage, &mail_error);
+
+		/* Don't bother administrator too much with benign errors */
+		if (mail_error == MAIL_ERROR_NOQUOTA) {
+			log_level = LOG_TYPE_INFO;
+			user_log_level = LOG_TYPE_INFO;
+		}
+	}
+
+	if (script == isrun->user_script && isrun->userlog != NULL) {
+		userlog_notice = t_strdup_printf(
+			" (user logfile %s may reveal additional details)",
+			isrun->userlog);
+		user_log_level = LOG_TYPE_INFO;
+	}
+
+	switch (status) {
+	case SIEVE_EXEC_FAILURE:
+		e_log(sieve_get_event(svinst), user_log_level,
+			"Execution of script %s failed%s",
+			sieve_script_location(script), userlog_notice);
+		ret = 0;
+		break;
+	case SIEVE_EXEC_TEMP_FAILURE:
+		e_log(sieve_get_event(svinst), log_level,
+		      "Execution of script %s was aborted "
+		      "due to temporary failure%s",
+		      sieve_script_location(script), userlog_notice);
+		*fatal_r = TRUE;
+		ret = -1;
+		break;
+	case SIEVE_EXEC_BIN_CORRUPT:
+		e_error(sieve_get_event(svinst),
+			"!!BUG!!: Binary compiled from %s is still corrupt; "
+			"bailing out and reverting to default action",
+			sieve_script_location(script));
+		*fatal_r = TRUE;
+		ret = -1;
+		break;
+	case SIEVE_EXEC_RESOURCE_LIMIT:
+		e_error(sieve_get_event(svinst),
+			"Execution of script %s was aborted "
+			"due to excessive resource usage",
+			sieve_script_location(script));
+		*fatal_r = TRUE;
+		ret = -1;
+		break;
+	case SIEVE_EXEC_KEEP_FAILED:
+		e_log(sieve_get_event(svinst), log_level,
+		      "Execution of script %s failed "
+		      "with unsuccessful implicit keep%s",
+		      sieve_script_location(script), userlog_notice);
+		ret = 0;
+		break;
+	case SIEVE_EXEC_OK:
+		ret = (estatus->keep_original ? 0 : 1);
+		break;
+	}
+
+	return ret;
+}
+
+static int
+imap_sieve_run_scripts(struct imap_sieve_run *isrun,
+		       const struct sieve_message_data *msgdata,
+		       const struct sieve_script_env *scriptenv, bool *fatal_r)
+{
+	struct imap_sieve *isieve = isrun->isieve;
+	struct sieve_instance *svinst = isieve->svinst;
+	struct imap_sieve_run_script *scripts = isrun->scripts;
+	unsigned int count = isrun->scripts_count;
+	struct sieve_resource_usage *rusage =
+		&scriptenv->exec_status->resource_usage;
+	struct sieve_multiscript *mscript;
+	struct sieve_error_handler *ehandler;
+	struct sieve_script *last_script = NULL;
+	bool user_script = FALSE, more = TRUE, rusage_exceeded = FALSE;
+	enum sieve_compile_flags cpflags;
+	enum sieve_execute_flags exflags;
+	enum sieve_error compile_error = SIEVE_ERROR_NONE;
+	unsigned int i;
+	int ret;
+
+	*fatal_r = FALSE;
+
+	/* Start execution */
+	mscript = sieve_multiscript_start_execute(svinst, msgdata, scriptenv);
+
+	/* Execute scripts */
+	for (i = 0; i < count && more; i++) {
+		struct sieve_script *script = scripts[i].script;
+		struct sieve_binary *sbin = scripts[i].binary;
+		int mstatus;
+
+		cpflags = 0;
+		exflags = SIEVE_EXECUTE_FLAG_NO_ENVELOPE |
+			  SIEVE_EXECUTE_FLAG_SKIP_RESPONSES;
+
+		user_script = (script == isrun->user_script);
+		last_script = script;
+
+		if (scripts[i].rusage_exceeded) {
+			rusage_exceeded = TRUE;
+			break;
+		}
+
+		sieve_resource_usage_init(rusage);
+		if (user_script) {
+			cpflags |= SIEVE_COMPILE_FLAG_NOGLOBAL;
+			exflags |= SIEVE_EXECUTE_FLAG_NOGLOBAL;
+			ehandler = isrun->user_ehandler;
+		} else {
+			cpflags |= SIEVE_COMPILE_FLAG_NO_ENVELOPE;
+			ehandler = isieve->master_ehandler;
+		}
+
+		/* Open */
+		if (sbin == NULL) {
+			e_debug(sieve_get_event(svinst),
+				"Opening script %d of %d from `%s'",
+				i+1, count, sieve_script_location(script));
+
+			/* Already known to fail */
+			if (scripts[i].compile_error != SIEVE_ERROR_NONE) {
+				compile_error = scripts[i].compile_error;
+				break;
+			}
+
+			/* Try to open/compile binary */
+			scripts[i].binary = sbin = imap_sieve_run_open_script(
+				isrun, script, cpflags, FALSE, &compile_error);
+			if (sbin == NULL) {
+				scripts[i].compile_error = compile_error;
+				break;
+			}
+		}
+
+		/* Execute */
+		e_debug(sieve_get_event(svinst),
+			"Executing script from `%s'",
+			sieve_get_source(sbin));
+		more = sieve_multiscript_run(mscript, sbin, ehandler, ehandler,
+					     exflags);
+
+		mstatus = sieve_multiscript_status(mscript);
+		if (!more && mstatus == SIEVE_EXEC_BIN_CORRUPT &&
+		    !scripts[i].binary_corrupt && sieve_is_loaded(sbin)) {
+			/* Close corrupt script */
+			sieve_close(&sbin);
+
+			/* Recompile */
+			scripts[i].binary = sbin =
+				imap_sieve_run_open_script(
+					isrun, script, cpflags, FALSE,
+					&compile_error);
+			if (sbin == NULL) {
+				scripts[i].compile_error = compile_error;
+				break;
+			}
+
+			/* Execute again */
+			more = sieve_multiscript_run(mscript, sbin,
+						     ehandler, ehandler,
+						     exflags);
+
+			/* Save new version */
+
+			mstatus = sieve_multiscript_status(mscript);
+			if (mstatus == SIEVE_EXEC_BIN_CORRUPT)
+				scripts[i].binary_corrupt = TRUE;
+			else if (more)
+				(void)sieve_save(sbin, FALSE, NULL);
+		}
+
+		if (user_script && !sieve_record_resource_usage(sbin, rusage)) {
+			rusage_exceeded = ((i + 1) < count && more);
+			scripts[i].rusage_exceeded = TRUE;
+			break;
+		}
+	}
+
+	/* Finish execution */
+	exflags = SIEVE_EXECUTE_FLAG_NO_ENVELOPE |
+		  SIEVE_EXECUTE_FLAG_SKIP_RESPONSES;
+	ehandler = (isrun->user_ehandler != NULL ?
+		    isrun->user_ehandler : isieve->master_ehandler);
+	if (compile_error == SIEVE_ERROR_TEMP_FAILURE) {
+		ret = sieve_multiscript_finish(&mscript, ehandler, exflags,
+					       SIEVE_EXEC_TEMP_FAILURE);
+	} else if (rusage_exceeded) {
+		i_assert(last_script != NULL);
+		(void)sieve_multiscript_finish(&mscript, ehandler, exflags,
+					       SIEVE_EXEC_TEMP_FAILURE);
+		sieve_error(ehandler, sieve_script_name(last_script),
+			    "cumulative resource usage limit exceeded");
+		ret = SIEVE_EXEC_RESOURCE_LIMIT;
+	} else {
+		ret = sieve_multiscript_finish(&mscript, ehandler, exflags,
+					       SIEVE_EXEC_OK);
+	}
+
+	/* Don't log additional messages about compile failure */
+	if (compile_error != SIEVE_ERROR_NONE && ret == SIEVE_EXEC_FAILURE) {
+		e_info(sieve_get_event(svinst),
+		       "Aborted script execution sequence "
+		       "with successful implicit keep");
+		return 1;
+	}
+
+	if (last_script == NULL && ret == SIEVE_EXEC_OK)
+		return 0;
+	return imap_sieve_handle_exec_status(isrun, last_script, ret,
+					     scriptenv->exec_status, fatal_r);
+}
+
+int imap_sieve_run_mail(struct imap_sieve_run *isrun, struct mail *mail,
+			const char *changed_flags, bool *fatal_r)
+{
+	struct imap_sieve *isieve = isrun->isieve;
+	struct sieve_instance *svinst = isieve->svinst;
+	struct mail_user *user = isieve->client->user;
+	struct sieve_message_data msgdata;
+	struct sieve_script_env scriptenv;
+	struct sieve_exec_status estatus;
+	struct imap_sieve_context context;
+	struct sieve_trace_config trace_config;
+	struct sieve_trace_log *trace_log;
+	const char *error;
+	int ret;
+
+	*fatal_r = FALSE;
+
+	i_zero(&context);
+	context.event.dest_mailbox = isrun->dest_mailbox;
+	context.event.src_mailbox = isrun->src_mailbox;
+	context.event.cause = isrun->cause;
+	context.event.changed_flags = changed_flags;
+	context.mail = mail;
+	context.isieve = isieve;
+
+	/* Initialize trace logging */
+	imap_sieve_run_init_trace_log(isrun, &trace_config, &trace_log);
+
+	T_BEGIN {
+		if (trace_log != NULL) {
+			/* Write trace header for message */
+			sieve_trace_log_printf(trace_log,
+				"Filtering message:\n"
+				"\n"
+				"  UID: %u\n", mail->uid);
+			if (changed_flags != NULL && *changed_flags != '\0') {
+				sieve_trace_log_printf(trace_log,
+					"  Changed flags: %s\n", changed_flags);
+			}
+		}
+
+		/* Collect necessary message data */
+
+		i_zero(&msgdata);
+		msgdata.mail = mail;
+		msgdata.auth_user = user->username;
+		(void)mail_get_message_id(msgdata.mail, &msgdata.id);
+
+		/* Compose script execution environment */
+
+		if (sieve_script_env_init(&scriptenv, user, &error) < 0) {
+			e_error(sieve_get_event(svinst),
+				"Failed to initialize script execution: %s",
+				error);
+			ret = -1;
+		} else {
+			scriptenv.default_mailbox =
+				mailbox_get_vname(mail->box);
+			scriptenv.smtp_start = imap_sieve_smtp_start;
+			scriptenv.smtp_add_rcpt = imap_sieve_smtp_add_rcpt;
+			scriptenv.smtp_send = imap_sieve_smtp_send;
+			scriptenv.smtp_abort = imap_sieve_smtp_abort;
+			scriptenv.smtp_finish = imap_sieve_smtp_finish;
+			scriptenv.duplicate_transaction_begin =
+				imap_sieve_duplicate_transaction_begin;
+			scriptenv.duplicate_transaction_commit =
+				imap_sieve_duplicate_transaction_commit;
+			scriptenv.duplicate_transaction_rollback =
+				imap_sieve_duplicate_transaction_rollback;
+			scriptenv.duplicate_mark = imap_sieve_duplicate_mark;
+			scriptenv.duplicate_check = imap_sieve_duplicate_check;
+			scriptenv.result_amend_log_message =
+				imap_sieve_result_amend_log_message;
+			scriptenv.trace_log = trace_log;
+			scriptenv.trace_config = trace_config;
+			scriptenv.script_context = &context;
+
+			i_zero(&estatus);
+			scriptenv.exec_status = &estatus;
+
+			/* Execute script(s) */
+
+			ret = imap_sieve_run_scripts(isrun, &msgdata,
+						     &scriptenv, fatal_r);
+		}
+	} T_END;
+
+	return ret;
+}
diff --git a/pigeonhole/src/plugins/imapsieve/imap-sieve.h b/pigeonhole/src/plugins/imapsieve/imap-sieve.h
new file mode 100644
index 0000000..12d0ac7
--- /dev/null
+++ b/pigeonhole/src/plugins/imapsieve/imap-sieve.h
@@ -0,0 +1,59 @@
+#ifndef IMAP_SIEVE_H
+#define IMAP_SIEVE_H
+
+struct client;
+
+/*
+ * IMAP event
+ */
+
+struct imap_sieve_event {
+	struct mailbox *dest_mailbox, *src_mailbox;
+	const char *cause;
+	const char *changed_flags;
+};
+
+struct imap_sieve_context {
+	struct imap_sieve_event event;
+	struct mail *mail;
+
+	struct imap_sieve *isieve;
+};
+
+static inline bool
+imap_sieve_event_cause_valid(const char *cause)
+{
+	return (strcasecmp(cause, "APPEND") == 0 ||
+		strcasecmp(cause, "COPY") == 0 ||
+		strcasecmp(cause, "FLAG") == 0);
+}
+
+/*
+ * IMAP Sieve
+ */
+
+struct imap_sieve;
+
+struct imap_sieve *imap_sieve_init(struct client *client);
+void imap_sieve_deinit(struct imap_sieve **_isieve);
+
+/*
+ * IMAP Sieve run
+ */
+
+struct imap_sieve_run;
+
+int imap_sieve_run_init(struct imap_sieve *isieve, struct mailbox *dest_mailbox,
+			struct mailbox *src_mailbox, const char *cause,
+			const char *script_name,
+			const char *const *scripts_before,
+			const char *const *scripts_after,
+			struct imap_sieve_run **isrun_r)
+			ATTR_NULL(4, 5, 6);
+
+int imap_sieve_run_mail(struct imap_sieve_run *isrun, struct mail *mail,
+			const char *changed_flags, bool *fatal_r);
+
+void imap_sieve_run_deinit(struct imap_sieve_run **_isrun);
+
+#endif
diff --git a/pigeonhole/src/plugins/imapsieve/sieve-imapsieve-plugin.c b/pigeonhole/src/plugins/imapsieve/sieve-imapsieve-plugin.c
new file mode 100644
index 0000000..12611b3
--- /dev/null
+++ b/pigeonhole/src/plugins/imapsieve/sieve-imapsieve-plugin.c
@@ -0,0 +1,62 @@
+/* Copyright (c) 2016-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve.h"
+#include "sieve-error.h"
+#include "sieve-extensions.h"
+
+#include "ext-imapsieve-common.h"
+
+#include "sieve-imapsieve-plugin.h"
+
+/*
+ * Sieve plugin interface
+ */
+
+struct _plugin_context {
+	const struct sieve_extension *ext_imapsieve;
+	const struct sieve_extension *ext_vnd_imapsieve;
+};
+
+const char *sieve_imapsieve_plugin_version = PIGEONHOLE_ABI_VERSION;
+
+void sieve_imapsieve_plugin_load
+(struct sieve_instance *svinst, void **context)
+{
+	struct _plugin_context *pctx = i_new(struct _plugin_context, 1);
+
+	pctx->ext_imapsieve = sieve_extension_register
+		(svinst, &imapsieve_extension_dummy, TRUE);
+	pctx->ext_vnd_imapsieve = sieve_extension_register
+		(svinst, &vnd_imapsieve_extension_dummy, TRUE);
+
+	e_debug(sieve_get_event(svinst),
+		"Sieve imapsieve plugin for %s version %s loaded",
+		PIGEONHOLE_NAME, PIGEONHOLE_VERSION_FULL);
+
+	*context = (void *)pctx;
+}
+
+void sieve_imapsieve_plugin_unload
+(struct sieve_instance *svinst ATTR_UNUSED, void *context)
+{
+	struct _plugin_context *pctx = (struct _plugin_context *)context;
+
+	sieve_extension_unregister(pctx->ext_imapsieve);
+	sieve_extension_unregister(pctx->ext_vnd_imapsieve);
+
+	i_free(pctx);}
+
+/*
+ * Module interface
+ */
+
+void sieve_imapsieve_plugin_init(void)
+{
+	/* Nothing */
+}
+
+void sieve_imapsieve_plugin_deinit(void)
+{
+	/* Nothing */
+}
diff --git a/pigeonhole/src/plugins/imapsieve/sieve-imapsieve-plugin.h b/pigeonhole/src/plugins/imapsieve/sieve-imapsieve-plugin.h
new file mode 100644
index 0000000..fcf9777
--- /dev/null
+++ b/pigeonhole/src/plugins/imapsieve/sieve-imapsieve-plugin.h
@@ -0,0 +1,20 @@
+#ifndef SIEVE_IMAPSIEVE_PLUGIN_H
+#define SIEVE_IMAPSIEVE_PLUGIN_H
+
+/*
+ * Plugin interface
+ */
+
+void sieve_imapsieve_plugin_load
+	(struct sieve_instance *svinst, void **context);
+void sieve_imapsieve_plugin_unload
+	(struct sieve_instance *svinst, void *context);
+
+/*
+ * Module interface
+ */
+
+void sieve_imapsieve_plugin_init(void);
+void sieve_imapsieve_plugin_deinit(void);
+
+#endif
diff --git a/pigeonhole/src/plugins/lda-sieve/Makefile.am b/pigeonhole/src/plugins/lda-sieve/Makefile.am
new file mode 100644
index 0000000..7c2797a
--- /dev/null
+++ b/pigeonhole/src/plugins/lda-sieve/Makefile.am
@@ -0,0 +1,19 @@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib-sieve \
+	$(LIBDOVECOT_INCLUDE) \
+	$(LIBDOVECOT_DICT_INCLUDE) \
+	$(LIBDOVECOT_SMTP_INCLUDE) \
+	$(LIBDOVECOT_LDA_INCLUDE)
+
+lib90_sieve_plugin_la_LDFLAGS = -module -avoid-version
+
+dovecot_module_LTLIBRARIES = lib90_sieve_plugin.la
+
+lib90_sieve_plugin_la_LIBADD = \
+	$(top_builddir)/src/lib-sieve/libdovecot-sieve.la
+
+lib90_sieve_plugin_la_SOURCES = \
+	lda-sieve-plugin.c
+
+noinst_HEADERS = \
+	lda-sieve-plugin.h
diff --git a/pigeonhole/src/plugins/lda-sieve/Makefile.in b/pigeonhole/src/plugins/lda-sieve/Makefile.in
new file mode 100644
index 0000000..6f0fba0
--- /dev/null
+++ b/pigeonhole/src/plugins/lda-sieve/Makefile.in
@@ -0,0 +1,746 @@
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+	install-data install-data-am install-dovecot_moduleLTLIBRARIES \
+	install-dvi install-dvi-am install-exec install-exec-am \
+	install-html install-html-am install-info install-info-am \
+	install-man install-pdf install-pdf-am install-ps \
+	install-ps-am install-strip installcheck installcheck-am \
+	installdirs maintainer-clean maintainer-clean-generic \
+	mostlyclean mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool pdf pdf-am ps ps-am tags tags-am uninstall \
+	uninstall-am uninstall-dovecot_moduleLTLIBRARIES
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/plugins/lda-sieve/lda-sieve-plugin.c b/pigeonhole/src/plugins/lda-sieve/lda-sieve-plugin.c
new file mode 100644
index 0000000..4e79c1f
--- /dev/null
+++ b/pigeonhole/src/plugins/lda-sieve/lda-sieve-plugin.c
@@ -0,0 +1,1128 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "array.h"
+#include "home-expand.h"
+#include "var-expand.h"
+#include "eacces-error.h"
+#include "smtp-address.h"
+#include "smtp-submit.h"
+#include "mail-storage.h"
+#include "mail-deliver.h"
+#include "mail-user.h"
+#include "mail-duplicate.h"
+#include "smtp-submit.h"
+#include "mail-send.h"
+#include "iostream-ssl.h"
+#include "lda-settings.h"
+
+#include "sieve.h"
+#include "sieve-script.h"
+#include "sieve-storage.h"
+
+#include "lda-sieve-plugin.h"
+
+#include <sys/stat.h>
+#include <dirent.h>
+
+/*
+ * Configuration
+ */
+
+#define LDA_SIEVE_DEFAULT_LOCATION "~/.dovecot.sieve"
+
+#define LDA_SIEVE_MAX_USER_ERRORS 30
+
+/*
+ * Global variables
+ */
+
+static deliver_mail_func_t *next_deliver_mail;
+
+/*
+ * Settings handling
+ */
+
+static const char *
+lda_sieve_get_setting(void *context, const char *identifier)
+{
+	struct mail_deliver_context *mdctx =
+		(struct mail_deliver_context *)context;
+	const char *value = NULL;
+
+	if (mdctx == NULL)
+		return NULL;
+
+	if (mdctx->rcpt_user == NULL ||
+	    (value = mail_user_plugin_getenv(
+		mdctx->rcpt_user, identifier)) == NULL) {
+		if (strcmp(identifier, "recipient_delimiter") == 0)
+			value = mdctx->set->recipient_delimiter;
+	}
+
+	return value;
+}
+
+static const struct sieve_callbacks lda_sieve_callbacks = {
+	NULL,
+	lda_sieve_get_setting
+};
+
+/*
+ * Mail transmission
+ */
+
+static void *
+lda_sieve_smtp_start(const struct sieve_script_env *senv,
+		     const struct smtp_address *mail_from)
+{
+	struct mail_deliver_context *dctx =
+		(struct mail_deliver_context *)senv->script_context;
+	struct mail_user *user = dctx->rcpt_user;
+	struct ssl_iostream_settings ssl_set;
+	struct smtp_submit_input submit_input;
+	
+	i_zero(&ssl_set);
+	mail_user_init_ssl_client_settings(user, &ssl_set);
+
+	i_zero(&submit_input);
+	submit_input.ssl = &ssl_set;
+
+	return (void *)smtp_submit_init_simple(&submit_input, dctx->smtp_set,
+					       mail_from);
+}
+
+static void
+lda_sieve_smtp_add_rcpt(const struct sieve_script_env *senv ATTR_UNUSED,
+			void *handle, const struct smtp_address *rcpt_to)
+{
+	struct smtp_submit *smtp_submit = (struct smtp_submit *) handle;
+
+	smtp_submit_add_rcpt(smtp_submit, rcpt_to);
+}
+
+static struct ostream *
+lda_sieve_smtp_send(const struct sieve_script_env *senv ATTR_UNUSED,
+		    void *handle)
+{
+	struct smtp_submit *smtp_submit = (struct smtp_submit *) handle;
+
+	return smtp_submit_send(smtp_submit);
+}
+
+static void
+lda_sieve_smtp_abort(const struct sieve_script_env *senv ATTR_UNUSED,
+		     void *handle)
+{
+	struct smtp_submit *smtp_submit = (struct smtp_submit *) handle;
+
+	smtp_submit_deinit(&smtp_submit);
+}
+
+static int
+lda_sieve_smtp_finish(const struct sieve_script_env *senv ATTR_UNUSED,
+		      void *handle, const char **error_r)
+{
+	struct smtp_submit *smtp_submit = (struct smtp_submit *) handle;
+	int ret;
+
+	ret = smtp_submit_run(smtp_submit, error_r);
+	smtp_submit_deinit(&smtp_submit);
+	return ret;
+}
+
+static int
+lda_sieve_reject_mail(const struct sieve_script_env *senv,
+		      const struct smtp_address *recipient,
+		      const char *reason)
+{
+	struct mail_deliver_context *dctx =
+		(struct mail_deliver_context *)senv->script_context;
+
+	return mail_send_rejection(dctx, recipient, reason);
+}
+
+/*
+ * Duplicate checking
+ */
+
+static void *
+lda_sieve_duplicate_transaction_begin(const struct sieve_script_env *senv)
+{
+	struct mail_deliver_context *dctx =
+		(struct mail_deliver_context *)senv->script_context;
+
+	return mail_duplicate_transaction_begin(dctx->dup_db);
+}
+
+static void lda_sieve_duplicate_transaction_commit(void **_dup_trans)
+{
+	struct mail_duplicate_transaction *dup_trans = *_dup_trans;
+
+	*_dup_trans = NULL;
+	mail_duplicate_transaction_commit(&dup_trans);
+}
+
+static void lda_sieve_duplicate_transaction_rollback(void **_dup_trans)
+{
+	struct mail_duplicate_transaction *dup_trans = *_dup_trans;
+
+	*_dup_trans = NULL;
+	mail_duplicate_transaction_rollback(&dup_trans);
+}
+
+static enum sieve_duplicate_check_result
+lda_sieve_duplicate_check(void *_dup_trans, const struct sieve_script_env *senv,
+			  const void *id, size_t id_size)
+{
+	struct mail_duplicate_transaction *dup_trans = _dup_trans;
+
+	switch (mail_duplicate_check(dup_trans, id, id_size,
+				     senv->user->username)) {
+	case MAIL_DUPLICATE_CHECK_RESULT_EXISTS:
+		return SIEVE_DUPLICATE_CHECK_RESULT_EXISTS;
+	case MAIL_DUPLICATE_CHECK_RESULT_NOT_FOUND:
+		return SIEVE_DUPLICATE_CHECK_RESULT_NOT_FOUND;
+	case MAIL_DUPLICATE_CHECK_RESULT_DEADLOCK:
+	case MAIL_DUPLICATE_CHECK_RESULT_LOCK_TIMEOUT:
+		return SIEVE_DUPLICATE_CHECK_RESULT_TEMP_FAILURE;
+	case MAIL_DUPLICATE_CHECK_RESULT_IO_ERROR:
+	case MAIL_DUPLICATE_CHECK_RESULT_TOO_MANY_LOCKS:
+		break;
+	}
+	return SIEVE_DUPLICATE_CHECK_RESULT_FAILURE;
+}
+
+static void
+lda_sieve_duplicate_mark(void *_dup_trans, const struct sieve_script_env *senv,
+			 const void *id, size_t id_size, time_t time)
+{
+	struct mail_duplicate_transaction *dup_trans = _dup_trans;
+
+	mail_duplicate_mark(dup_trans, id, id_size, senv->user->username, time);
+}
+
+/*
+ * Result logging
+ */
+
+static const char *
+lda_sieve_result_amend_log_message(const struct sieve_script_env *senv,
+				   enum log_type log_type ATTR_UNUSED,
+				   const char *message)
+{
+	struct mail_deliver_context *mdctx = senv->script_context;
+	const struct var_expand_table *table;
+	string_t *str;
+	const char *error;
+
+	table = mail_deliver_ctx_get_log_var_expand_table(mdctx, message);
+
+	str = t_str_new(256);
+	if (var_expand(str, mdctx->set->deliver_log_format,
+		       table, &error) <= 0) {
+		e_error(mdctx->event,
+			"Failed to expand deliver_log_format=%s: %s",
+			mdctx->set->deliver_log_format, error);
+	}
+	return str_c(str);
+}
+
+/*
+ * Plugin implementation
+ */
+
+struct lda_sieve_run_context {
+	struct sieve_instance *svinst;
+
+	struct mail_deliver_context *mdctx;
+	const char *home_dir;
+
+	struct sieve_script **scripts;
+	unsigned int script_count;
+
+	struct sieve_script *user_script;
+	struct sieve_script *main_script;
+	struct sieve_script *discard_script;
+
+	const struct sieve_message_data *msgdata;
+	const struct sieve_script_env *scriptenv;
+
+	struct sieve_error_handler *user_ehandler;
+	struct sieve_error_handler *master_ehandler;
+	struct sieve_error_handler *action_ehandler;
+	const char *userlog;
+};
+
+static int
+lda_sieve_get_personal_storage(struct sieve_instance *svinst,
+			       struct mail_user *user,
+			       struct sieve_storage **storage_r,
+			       enum sieve_error *error_r)
+{
+	*storage_r = sieve_storage_create_main(svinst, user, 0, error_r);
+	if (*storage_r == NULL) {
+		switch (*error_r) {
+		case SIEVE_ERROR_NOT_POSSIBLE:
+		case SIEVE_ERROR_NOT_FOUND:
+			break;
+		case SIEVE_ERROR_TEMP_FAILURE:
+			e_error(sieve_get_event(svinst),
+				"Failed to access user's personal storage "
+				"(temporary failure)");
+			return -1;
+		default:
+			e_error(sieve_get_event(svinst),
+				"Failed to access user's personal storage");
+			break;
+		}
+		return 0;
+	}
+	return 1;
+}
+
+static int
+lda_sieve_multiscript_get_scripts(struct sieve_instance *svinst,
+				  const char *label, const char *location,
+				  ARRAY_TYPE(sieve_script) *scripts,
+				  enum sieve_error *error_r)
+{
+	struct sieve_script_sequence *seq;
+	struct sieve_script *script;
+	bool finished = FALSE;
+	int ret = 1;
+
+	seq = sieve_script_sequence_create(svinst, location, error_r);
+	if (seq == NULL)
+		return (*error_r == SIEVE_ERROR_NOT_FOUND ? 0 : -1);
+
+	while (ret > 0 && !finished) {
+		script = sieve_script_sequence_next(seq, error_r);
+		if (script == NULL) {
+			switch (*error_r) {
+			case SIEVE_ERROR_NONE:
+				finished = TRUE;
+				break;
+			case SIEVE_ERROR_TEMP_FAILURE:
+				e_error(sieve_get_event(svinst),
+					"Failed to access %s script from `%s' "
+					"(temporary failure)",
+					label, location);
+				ret = -1;
+			default:
+				break;
+			}
+			continue;
+		}
+
+		array_append(scripts, &script, 1);
+	}
+
+	sieve_script_sequence_free(&seq);
+	return ret;
+}
+
+static void
+lda_sieve_binary_save(struct lda_sieve_run_context *srctx,
+		      struct sieve_binary *sbin, struct sieve_script *script)
+{
+	enum sieve_error error;
+
+	/* Save binary when compiled */
+	if (sieve_save(sbin, FALSE, &error) < 0 &&
+	    error == SIEVE_ERROR_NO_PERMISSION &&
+	    script != srctx->user_script) {
+		/* Cannot save binary for global script */
+		e_error(sieve_get_event(srctx->svinst),
+			"The LDA Sieve plugin does not have permission "
+			"to save global Sieve script binaries; "
+			"global Sieve scripts like `%s' need to be "
+			"pre-compiled using the sievec tool",
+			sieve_script_location(script));
+	}
+}
+
+static struct
+sieve_binary *lda_sieve_open(struct lda_sieve_run_context *srctx,
+			     struct sieve_script *script,
+			     enum sieve_compile_flags cpflags, bool recompile,
+			     enum sieve_error *error_r)
+{
+	struct sieve_instance *svinst = srctx->svinst;
+	struct sieve_error_handler *ehandler;
+	struct sieve_binary *sbin;
+	const char *compile_name = "compile";
+
+	if (recompile) {
+		/* Warn */
+		e_warning(sieve_get_event(svinst),
+			  "Encountered corrupt binary: re-compiling script %s",
+			  sieve_script_location(script));
+		compile_name = "re-compile";
+	} else {
+		e_debug(sieve_get_event(svinst),
+			"Loading script %s", sieve_script_location(script));
+	}
+
+	if (script == srctx->user_script)
+		ehandler = srctx->user_ehandler;
+	else
+		ehandler = srctx->master_ehandler;
+
+	sieve_error_handler_reset(ehandler);
+
+	if (recompile)
+		sbin = sieve_compile_script(script, ehandler, cpflags, error_r);
+	else 
+		sbin = sieve_open_script(script, ehandler, cpflags, error_r);
+
+	/* Load or compile the sieve script */
+	if (sbin == NULL) {
+		switch (*error_r) {
+		/* Script not found */
+		case SIEVE_ERROR_NOT_FOUND:
+			e_debug(sieve_get_event(svinst),
+				"Script `%s' is missing for %s",
+				sieve_script_location(script),
+				compile_name);
+			break;
+		/* Temporary failure */
+		case SIEVE_ERROR_TEMP_FAILURE:
+			e_error(sieve_get_event(svinst),
+				"Failed to open script `%s' for %s "
+				"(temporary failure)",
+				sieve_script_location(script), compile_name);
+			break;
+		/* Compile failed */
+		case SIEVE_ERROR_NOT_VALID:
+			if (script == srctx->user_script &&
+			    srctx->userlog != NULL ) {
+				e_info(sieve_get_event(svinst),
+				       "Failed to %s script `%s' "
+				       "(view user logfile `%s' for more information)",
+				       compile_name,
+				       sieve_script_location(script),
+				       srctx->userlog);
+				break;
+			}
+			e_error(sieve_get_event(svinst),
+				"Failed to %s script `%s'",
+				compile_name, sieve_script_location(script));
+			break;
+		/* Cumulative resource limit exceeded */
+		case SIEVE_ERROR_RESOURCE_LIMIT:
+			e_error(sieve_get_event(svinst),
+				"Failed to open script `%s' for %s "
+				"(cumulative resource limit exceeded)",
+				sieve_script_location(script), compile_name);
+			break;
+		/* Something else */
+		default:
+			e_error(sieve_get_event(svinst),
+				"Failed to open script `%s' for %s",
+				sieve_script_location(script), compile_name);
+			break;
+		}
+
+		return NULL;
+	}
+
+	if (!recompile)
+		lda_sieve_binary_save(srctx, sbin, script);
+	return sbin;
+}
+
+static int
+lda_sieve_handle_exec_status(struct lda_sieve_run_context *srctx,
+			     struct sieve_script *script, int status)
+{
+	struct sieve_instance *svinst = srctx->svinst;
+	struct mail_deliver_context *mdctx = srctx->mdctx;
+	struct sieve_exec_status *estatus = srctx->scriptenv->exec_status;
+	const char *userlog_notice = "";
+	enum log_type log_level, user_log_level;
+	enum mail_error mail_error = MAIL_ERROR_NONE;
+	int ret;
+
+	log_level = user_log_level = LOG_TYPE_ERROR;
+
+	if (estatus != NULL && estatus->last_storage != NULL &&
+	    estatus->store_failed) {
+		mail_storage_get_last_error(estatus->last_storage, &mail_error);
+
+		/* Don't bother administrator too much with benign errors */
+		if (mail_error == MAIL_ERROR_NOQUOTA) {
+			log_level = LOG_TYPE_INFO;
+			user_log_level = LOG_TYPE_INFO;
+		}
+	}
+
+	if (script == srctx->user_script && srctx->userlog != NULL) {
+		userlog_notice = t_strdup_printf(
+			" (user logfile %s may reveal additional details)",
+			srctx->userlog);
+		user_log_level = LOG_TYPE_INFO;
+	}
+
+	switch (status) {
+	case SIEVE_EXEC_FAILURE:
+		e_log(sieve_get_event(svinst), user_log_level,
+		      "Execution of script %s failed, "
+		      "but implicit keep was successful%s",
+		      sieve_script_location(script), userlog_notice);
+		ret = 1;
+		break;
+	case SIEVE_EXEC_TEMP_FAILURE:
+		e_log(sieve_get_event(svinst), log_level,
+		      "Execution of script %s was aborted due to temporary failure%s",
+		      sieve_script_location(script), userlog_notice);
+		if (mail_error != MAIL_ERROR_TEMP &&
+		    mdctx->tempfail_error == NULL) {
+			mdctx->tempfail_error =
+				"Execution of Sieve filters was aborted due to temporary failure";
+		}
+		ret = -1;
+		break;
+	case SIEVE_EXEC_BIN_CORRUPT:
+		e_error(sieve_get_event(svinst),
+			"!!BUG!!: Binary compiled from %s is still corrupt; "
+			"bailing out and reverting to default delivery",
+			sieve_script_location(script));
+		ret = -1;
+		break;
+	case SIEVE_EXEC_RESOURCE_LIMIT:
+		e_error(sieve_get_event(svinst),
+			"Execution of script %s was aborted "
+			"due to excessive resource usage",
+			sieve_script_location(script));
+		ret = -1;
+		break;
+	case SIEVE_EXEC_KEEP_FAILED:
+		e_log(sieve_get_event(svinst), log_level,
+		      "Execution of script %s failed with unsuccessful implicit keep%s",
+		      sieve_script_location(script), userlog_notice);
+		ret = -1;
+		break;
+	default:
+		ret = status > 0 ? 1 : -1;
+		break;
+	}
+
+	return ret;
+}
+
+static int
+lda_sieve_execute_script(struct lda_sieve_run_context *srctx,
+			 struct sieve_multiscript *mscript,
+			 struct sieve_script *script,
+			 unsigned int index, bool discard_script,
+			 enum sieve_error *error_r)
+{
+	struct sieve_instance *svinst = srctx->svinst;
+	struct sieve_error_handler *exec_ehandler;
+	struct sieve_binary *sbin = NULL;
+	enum sieve_compile_flags cpflags = 0;
+	enum sieve_execute_flags exflags = SIEVE_EXECUTE_FLAG_LOG_RESULT;
+	struct sieve_resource_usage *rusage =
+		&srctx->scriptenv->exec_status->resource_usage;
+	bool user_script;
+	int mstatus, ret;
+
+	*error_r = SIEVE_ERROR_NONE;
+
+	user_script = (script == srctx->user_script);
+
+	sieve_resource_usage_init(rusage);
+	if (user_script) {
+		cpflags |= SIEVE_COMPILE_FLAG_NOGLOBAL;
+		exflags |= SIEVE_EXECUTE_FLAG_NOGLOBAL;
+		exec_ehandler = srctx->user_ehandler;
+	} else {
+		exec_ehandler = srctx->master_ehandler;
+	}
+
+	/* Open */
+
+	if (!discard_script) {
+		e_debug(sieve_get_event(svinst),
+			"Opening script %d of %d from `%s'",
+			index, srctx->script_count,
+			sieve_script_location(script));
+	} else {
+		e_debug(sieve_get_event(svinst),
+			"Opening discard script from `%s'",
+			sieve_script_location(script));
+	}
+
+	sbin = lda_sieve_open(srctx, script, cpflags, FALSE, error_r);
+	if (sbin == NULL)
+		return 0;
+
+	/* Execute */
+
+	e_debug(sieve_get_event(svinst),
+		"Executing script from `%s'",
+		sieve_get_source(sbin));
+
+	if (!discard_script) {
+		ret = (sieve_multiscript_run(mscript, sbin, exec_ehandler,
+					     exec_ehandler, exflags) ? 1 : 0);
+	} else {
+		sieve_multiscript_run_discard(mscript, sbin, exec_ehandler,
+					      exec_ehandler, exflags);
+		ret = 0;
+	}
+
+	mstatus = sieve_multiscript_status(mscript);
+	if (ret == 0 && mstatus == SIEVE_EXEC_BIN_CORRUPT &&
+	    sieve_is_loaded(sbin)) {
+		/* Close corrupt script */
+
+		sieve_close(&sbin);
+
+		/* Recompile */
+
+		sbin = lda_sieve_open(srctx, script, cpflags, TRUE,
+				      error_r);
+		if (sbin == NULL)
+			return 0;
+
+		/* Execute again */
+
+		if (!discard_script) {
+			ret = (sieve_multiscript_run(
+				mscript, sbin, exec_ehandler,
+				exec_ehandler, exflags) ? 1 : 0);
+		} else {
+			sieve_multiscript_run_discard(
+				mscript, sbin, exec_ehandler,
+				exec_ehandler, exflags);
+		}
+
+		/* Save new version */
+
+		mstatus = sieve_multiscript_status(mscript);
+		if (mstatus != SIEVE_EXEC_BIN_CORRUPT)
+			lda_sieve_binary_save(srctx, sbin, script);
+	}
+	if (ret == 0 && mstatus == SIEVE_EXEC_RESOURCE_LIMIT)
+		ret = -1;
+
+	if (user_script)
+		(void)sieve_record_resource_usage(sbin, rusage);
+
+	sieve_close(&sbin);
+
+	return ret;
+}
+
+static int lda_sieve_execute_scripts(struct lda_sieve_run_context *srctx)
+{
+	struct sieve_instance *svinst = srctx->svinst;
+	struct sieve_multiscript *mscript;
+	struct sieve_error_handler *exec_ehandler;
+	struct sieve_script *script, *last_script = NULL;
+	enum sieve_execute_flags exflags = SIEVE_EXECUTE_FLAG_LOG_RESULT;
+	bool discard_script;
+	enum sieve_error error;
+	unsigned int i;
+	int ret;
+
+	i_assert(srctx->script_count > 0);
+
+	/* Start execution */
+
+	mscript = sieve_multiscript_start_execute(svinst, srctx->msgdata,
+						  srctx->scriptenv);
+
+	/* Execute scripts */
+
+	i = 0;
+	discard_script = FALSE;
+	error = SIEVE_ERROR_NONE;
+	for (;;) {
+		if (!discard_script) {
+			/* normal script sequence */
+			i_assert(i < srctx->script_count);
+			script = srctx->scripts[i];
+			i++;
+		} else {
+			/* discard script */
+			script = srctx->discard_script;
+		}
+
+		i_assert(script != NULL);
+		last_script = script;
+
+		ret = lda_sieve_execute_script(srctx, mscript, script, i,
+					       discard_script, &error);
+		if (ret < 0)
+			break;
+		if (error == SIEVE_ERROR_NOT_FOUND) {
+			/* skip scripts which finally turn out not to exist */
+			ret = 1;
+		}
+
+		if (discard_script) {
+			/* Executed discard script, which is always final */
+			break;
+		} else if (ret > 0) {
+			/* The "keep" action is applied; execute next script */
+			i_assert(i <= srctx->script_count);
+			if (i == srctx->script_count) {
+				/* End of normal script sequence */
+				break;
+			}
+		} else if (error != SIEVE_ERROR_NONE) {
+			break;
+		} else if (sieve_multiscript_will_discard(mscript) &&
+			   srctx->discard_script != NULL) {
+			/* Mail is set to be discarded, but we have a discard script. */
+			discard_script = TRUE;
+		} else {
+			break;
+		}
+	}
+
+	/* Finish execution */
+	exec_ehandler = (srctx->user_ehandler != NULL ?
+			 srctx->user_ehandler : srctx->master_ehandler);
+	ret = sieve_multiscript_finish(&mscript, exec_ehandler, exflags,
+				       (error == SIEVE_ERROR_TEMP_FAILURE ?
+					SIEVE_EXEC_TEMP_FAILURE :
+					SIEVE_EXEC_OK));
+
+	/* Don't log additional messages about compile failure */
+	if (error != SIEVE_ERROR_NONE && ret == SIEVE_EXEC_FAILURE) {
+		e_info(sieve_get_event(svinst),
+		       "Aborted script execution sequence with successful implicit keep");
+		return 1;
+	}
+
+	return lda_sieve_handle_exec_status(srctx, last_script, ret);
+}
+
+static int lda_sieve_find_scripts(struct lda_sieve_run_context *srctx)
+{
+	struct mail_deliver_context *mdctx = srctx->mdctx;
+	struct sieve_instance *svinst = srctx->svinst;
+	struct sieve_storage *main_storage;
+	const char *sieve_before, *sieve_after, *sieve_discard;
+	const char *setting_name;
+	enum sieve_error error;
+	ARRAY_TYPE(sieve_script) script_sequence;
+	struct sieve_script *const *scripts;
+	unsigned int after_index, count, i;
+	int ret = 1;
+
+	/* Find the personal script to execute */
+
+	ret = lda_sieve_get_personal_storage(svinst, mdctx->rcpt_user,
+					     &main_storage, &error);
+	if (ret == 0 && error == SIEVE_ERROR_NOT_POSSIBLE)
+		return 0;
+	if (ret > 0) {
+		srctx->main_script =
+			sieve_storage_active_script_open(main_storage, &error);
+
+		if (srctx->main_script == NULL) {
+			switch (error) {
+			case SIEVE_ERROR_NOT_FOUND:
+				e_debug(sieve_get_event(svinst),
+					"User has no active script in storage `%s'",
+					sieve_storage_location(main_storage));
+				break;
+			case SIEVE_ERROR_TEMP_FAILURE:
+				e_error(sieve_get_event(svinst),
+					"Failed to access active Sieve script in user storage `%s' "
+					"(temporary failure)",
+					sieve_storage_location(main_storage));
+				ret = -1;
+				break;
+			default:
+				e_error(sieve_get_event(svinst),
+					"Failed to access active Sieve script in user storage `%s'",
+					sieve_storage_location(main_storage));
+				break;
+			}
+		} else if (!sieve_script_is_default(srctx->main_script)) {
+			srctx->user_script = srctx->main_script;
+		}
+		sieve_storage_unref(&main_storage);
+	}
+
+	if (ret >= 0 && srctx->main_script == NULL) {
+		e_debug(sieve_get_event(svinst),
+			"User has no personal script");
+	}
+
+	/* Compose script array */
+
+	t_array_init(&script_sequence, 16);
+	
+	/* before */
+	if (ret >= 0) {
+		i = 2;
+		setting_name = "sieve_before";
+		sieve_before = mail_user_plugin_getenv(
+			mdctx->rcpt_user, setting_name);
+		while (ret >= 0 &&
+		       sieve_before != NULL && *sieve_before != '\0') {
+			ret = lda_sieve_multiscript_get_scripts(
+				svinst, setting_name, sieve_before,
+				&script_sequence, &error);
+			if (ret < 0 && error == SIEVE_ERROR_TEMP_FAILURE) {
+				ret = -1;
+				break;
+			} else if (ret == 0) {
+				e_debug(sieve_get_event(svinst),
+					"Location for %s not found: %s",
+					setting_name, sieve_before);
+			}
+			ret = 0;
+			setting_name = t_strdup_printf("sieve_before%u", i++);
+			sieve_before = mail_user_plugin_getenv(
+				mdctx->rcpt_user, setting_name);
+		}
+
+		if (ret >= 0) {
+			scripts = array_get(&script_sequence, &count);
+			for (i = 0; i < count; i ++) {
+				e_debug(sieve_get_event(svinst),
+					"Executed before user's personal Sieve script(%d): %s",
+					i+1, sieve_script_location(scripts[i]));
+			}
+		}
+	}
+
+	/* main */
+	if (srctx->main_script != NULL) {
+		array_append(&script_sequence, &srctx->main_script, 1);
+
+		if (ret >= 0) {
+			e_debug(sieve_get_event(svinst),
+				"Using the following location for user's Sieve script: %s",
+				sieve_script_location(srctx->main_script));
+		}
+	}
+
+	after_index = array_count(&script_sequence);
+
+	/* after */
+	if (ret >= 0) {
+		i = 2;
+		setting_name = "sieve_after";
+		sieve_after = mail_user_plugin_getenv(mdctx->rcpt_user, setting_name);
+		while (sieve_after != NULL && *sieve_after != '\0') {
+			ret = lda_sieve_multiscript_get_scripts(
+				svinst, setting_name, sieve_after,
+				&script_sequence, &error);
+			if (ret < 0 && error == SIEVE_ERROR_TEMP_FAILURE) {
+				ret = -1;
+				break;
+			} else if (ret == 0) {
+				e_debug(sieve_get_event(svinst),
+					"Location for %s not found: %s",
+					setting_name, sieve_after);
+			}
+			ret = 0;
+			setting_name = t_strdup_printf("sieve_after%u", i++);
+			sieve_after = mail_user_plugin_getenv(
+				mdctx->rcpt_user, setting_name);
+		}
+
+		if (ret >= 0) {
+			scripts = array_get(&script_sequence, &count);
+			for ( i = after_index; i < count; i ++ ) {
+				e_debug(sieve_get_event(svinst),
+					"executed after user's Sieve script(%d): %s",
+					i+1, sieve_script_location(scripts[i]));
+			}
+		}
+	}
+
+	/* discard */
+	sieve_discard = mail_user_plugin_getenv(
+		mdctx->rcpt_user, "sieve_discard");
+	if (sieve_discard != NULL && *sieve_discard != '\0') {
+		srctx->discard_script = sieve_script_create_open(
+			svinst, sieve_discard, NULL, &error);
+		if (srctx->discard_script == NULL) {
+			switch (error) {
+			case SIEVE_ERROR_NOT_FOUND:
+				e_debug(sieve_get_event(svinst),
+					"Location for sieve_discard not found: %s",
+					sieve_discard);
+				break;
+			case SIEVE_ERROR_TEMP_FAILURE:
+				ret = -1;
+				break;
+			default:
+				break;
+			}
+		}
+	}
+
+	if (ret < 0) {
+		mdctx->tempfail_error =
+			"Temporarily unable to access necessary Sieve scripts";
+	}
+	srctx->scripts =
+		array_get_modifiable(&script_sequence, &srctx->script_count);
+	return ret;
+}
+
+static void
+lda_sieve_free_scripts(struct lda_sieve_run_context *srctx)
+{
+	unsigned int i;
+
+	for (i = 0; i < srctx->script_count; i++)
+		sieve_script_unref(&srctx->scripts[i]);
+	if (srctx->discard_script != NULL)
+		sieve_script_unref(&srctx->discard_script);
+}
+
+static void
+lda_sieve_init_trace_log(struct lda_sieve_run_context *srctx,
+			 const struct smtp_address *mail_from,
+			 struct sieve_trace_config *trace_config_r,
+			 struct sieve_trace_log **trace_log_r)
+{
+	struct mail_deliver_context *mdctx = srctx->mdctx;
+	struct sieve_instance *svinst = srctx->svinst;
+	struct sieve_trace_log *trace_log = NULL;
+
+	if (sieve_trace_config_get(svinst, trace_config_r) < 0 ||
+	    sieve_trace_log_open(svinst, &trace_log) < 0) {
+		i_zero(trace_config_r);
+		*trace_log_r = NULL;
+		return;
+	}
+
+	/* Write header for trace file */
+	sieve_trace_log_printf(trace_log,
+		"Sieve trace log for message delivery:\n"
+		"\n"
+		"  Username: %s\n", mdctx->rcpt_user->username);
+	if (mdctx->rcpt_user->session_id != NULL) {
+		sieve_trace_log_printf(trace_log,
+			"  Session ID: %s\n",
+			mdctx->rcpt_user->session_id);
+	}
+	sieve_trace_log_printf(trace_log,
+		"  Sender: %s\n"
+		"  Final recipient: %s\n"
+		"  Default mailbox: %s\n\n",
+		smtp_address_encode_path(mail_from),
+		smtp_address_encode_path(mdctx->rcpt_to),
+		(mdctx->rcpt_default_mailbox != NULL ?
+		 mdctx->rcpt_default_mailbox : "INBOX"));
+
+	*trace_log_r = trace_log;
+}
+
+static int
+lda_sieve_execute(struct lda_sieve_run_context *srctx,
+		  struct mail_storage **storage_r)
+{
+	struct mail_deliver_context *mdctx = srctx->mdctx;
+	struct sieve_instance *svinst = srctx->svinst;
+	struct sieve_message_data msgdata;
+	struct sieve_script_env scriptenv;
+	struct sieve_exec_status estatus;
+	struct sieve_trace_config trace_config;
+	const struct smtp_address *mail_from;
+	struct sieve_trace_log *trace_log;
+	const char *error;
+	int ret;
+
+	/* Check whether there are any scripts to execute at all */
+
+	if (srctx->script_count == 0) {
+		e_debug(sieve_get_event(svinst),
+			"No scripts to execute: "
+			"reverting to default delivery.");
+
+		/* No error, but no delivery by this plugin either. A return
+		   value of <= 0 for a deliver plugin is is considered a
+		   failure. In deliver itself, saved_mail and tried_default_save
+		   remain unset, meaning that deliver will then attempt the
+		   default delivery. We return 0 to signify the lack of a real
+		   error.
+		 */
+		return 0;
+	}
+
+	/* Initialize user error handler */
+
+	if (srctx->user_script != NULL) {
+		const char *log_path =
+			sieve_user_get_log_path(svinst, srctx->user_script);
+
+		if (log_path != NULL) {
+			srctx->userlog = log_path;
+			srctx->user_ehandler = sieve_logfile_ehandler_create(
+				svinst, srctx->userlog,
+				LDA_SIEVE_MAX_USER_ERRORS);
+		}
+	}
+
+	/* Determine return address */
+
+	mail_from = mail_deliver_get_return_address(mdctx);
+
+	/* Initialize trace logging */
+
+	lda_sieve_init_trace_log(srctx, mail_from, &trace_config, &trace_log);
+
+	/* Collect necessary message data */
+
+	i_zero(&msgdata);
+
+	msgdata.mail = mdctx->src_mail;
+	msgdata.auth_user = mdctx->rcpt_user->username;
+	msgdata.envelope.mail_from = mail_from;
+	msgdata.envelope.mail_params = &mdctx->mail_params;
+	msgdata.envelope.rcpt_to = mdctx->rcpt_to;
+	msgdata.envelope.rcpt_params = &mdctx->rcpt_params;
+	(void)mail_get_message_id(msgdata.mail, &msgdata.id);
+
+	srctx->msgdata = &msgdata;
+
+	/* Compose script execution environment */
+
+	if (sieve_script_env_init(&scriptenv, mdctx->rcpt_user, &error) < 0) {
+		e_error(sieve_get_event(svinst),
+			"Failed to initialize script execution: %s", error);
+		if (trace_log != NULL)
+			sieve_trace_log_free(&trace_log);
+		return -1;
+	}
+
+	scriptenv.default_mailbox = mdctx->rcpt_default_mailbox;
+	scriptenv.mailbox_autocreate = mdctx->set->lda_mailbox_autocreate;
+	scriptenv.mailbox_autosubscribe = mdctx->set->lda_mailbox_autosubscribe;
+	scriptenv.smtp_start = lda_sieve_smtp_start;
+	scriptenv.smtp_add_rcpt = lda_sieve_smtp_add_rcpt;
+	scriptenv.smtp_send = lda_sieve_smtp_send;
+	scriptenv.smtp_abort = lda_sieve_smtp_abort;
+	scriptenv.smtp_finish = lda_sieve_smtp_finish;
+	scriptenv.duplicate_transaction_begin =
+		lda_sieve_duplicate_transaction_begin;
+	scriptenv.duplicate_transaction_commit =
+		lda_sieve_duplicate_transaction_commit;
+	scriptenv.duplicate_transaction_rollback =
+		lda_sieve_duplicate_transaction_rollback;
+	scriptenv.duplicate_mark = lda_sieve_duplicate_mark;
+	scriptenv.duplicate_check = lda_sieve_duplicate_check;
+	scriptenv.reject_mail = lda_sieve_reject_mail;
+	scriptenv.result_amend_log_message = lda_sieve_result_amend_log_message;
+	scriptenv.script_context = (void *) mdctx;
+	scriptenv.trace_log = trace_log;
+	scriptenv.trace_config = trace_config;
+
+	i_zero(&estatus);
+	scriptenv.exec_status = &estatus;
+
+	srctx->scriptenv = &scriptenv;
+
+	/* Execute script(s) */
+
+	ret = lda_sieve_execute_scripts(srctx);
+
+	/* Record status */
+
+	mdctx->tried_default_save = estatus.tried_default_save;
+	*storage_r = estatus.last_storage;
+
+	if (trace_log != NULL)
+		sieve_trace_log_free(&trace_log);
+
+	return ret;
+}
+
+static int
+lda_sieve_deliver_mail(struct mail_deliver_context *mdctx,
+		       struct mail_storage **storage_r)
+{
+	struct lda_sieve_run_context srctx;
+	const struct mail_storage_settings *mail_set =
+		mail_user_set_get_storage_set(mdctx->rcpt_user);
+	bool debug = mdctx->rcpt_user->mail_debug;
+	struct sieve_environment svenv;
+	int ret = 0;
+
+	/* Initialize run context */
+
+	i_zero(&srctx);
+	srctx.mdctx = mdctx;
+	(void)mail_user_get_home(mdctx->rcpt_user, &srctx.home_dir);
+
+	/* Initialize Sieve engine */
+
+	memset((void*)&svenv, 0, sizeof(svenv));
+	svenv.username = mdctx->rcpt_user->username;
+	svenv.home_dir = srctx.home_dir;
+	svenv.hostname = mail_set->hostname;
+	svenv.base_dir = mdctx->rcpt_user->set->base_dir;
+	svenv.temp_dir = mdctx->rcpt_user->set->mail_temp_dir;
+	svenv.event_parent = mdctx->event;
+	svenv.flags = SIEVE_FLAG_HOME_RELATIVE;
+	svenv.location = SIEVE_ENV_LOCATION_MDA;
+	svenv.delivery_phase = SIEVE_DELIVERY_PHASE_DURING;
+
+	srctx.svinst = sieve_init(&svenv, &lda_sieve_callbacks, mdctx, debug);
+
+	/* Initialize master error handler */
+
+	srctx.master_ehandler = sieve_master_ehandler_create(srctx.svinst, 0);
+
+	sieve_error_handler_accept_infolog(srctx.master_ehandler, TRUE);
+	sieve_error_handler_accept_debuglog(srctx.master_ehandler, debug);
+
+	*storage_r = NULL;
+
+	/* Find Sieve scripts and run them */
+
+	T_BEGIN {
+		if (lda_sieve_find_scripts(&srctx) < 0)
+			ret = -1;
+		else if (srctx.scripts == NULL)
+			ret = 0;
+		else
+			ret = lda_sieve_execute(&srctx, storage_r);
+
+		lda_sieve_free_scripts(&srctx);
+	} T_END;
+
+	/* Clean up */
+
+	if (srctx.user_ehandler != NULL)
+		sieve_error_handler_unref(&srctx.user_ehandler);
+	sieve_error_handler_unref(&srctx.master_ehandler);
+	sieve_deinit(&srctx.svinst);
+
+	return ret;
+}
+
+/*
+ * Plugin interface
+ */
+
+const char *sieve_plugin_version = DOVECOT_ABI_VERSION;
+const char sieve_plugin_binary_dependency[] = "lda lmtp";
+
+void sieve_plugin_init(void)
+{
+	/* Hook into the delivery process */
+	next_deliver_mail = mail_deliver_hook_set(lda_sieve_deliver_mail);
+}
+
+void sieve_plugin_deinit(void)
+{
+	/* Remove hook */
+	mail_deliver_hook_set(next_deliver_mail);
+}
diff --git a/pigeonhole/src/plugins/lda-sieve/lda-sieve-plugin.h b/pigeonhole/src/plugins/lda-sieve/lda-sieve-plugin.h
new file mode 100644
index 0000000..2357097
--- /dev/null
+++ b/pigeonhole/src/plugins/lda-sieve/lda-sieve-plugin.h
@@ -0,0 +1,11 @@
+#ifndef LDA_SIEVE_PLUGIN_H
+#define LDA_SIEVE_PLUGIN_H
+
+/*
+ * Plugin interface
+ */
+
+void sieve_plugin_init(void);
+void sieve_plugin_deinit(void);
+
+#endif
diff --git a/pigeonhole/src/plugins/settings/Makefile.am b/pigeonhole/src/plugins/settings/Makefile.am
new file mode 100644
index 0000000..49537e1
--- /dev/null
+++ b/pigeonhole/src/plugins/settings/Makefile.am
@@ -0,0 +1,12 @@
+settingsdir = $(dovecot_moduledir)/settings
+
+AM_CPPFLAGS = \
+	$(LIBDOVECOT_INCLUDE)
+
+libpigeonhole_settings_la_LDFLAGS = -module -avoid-version
+
+settings_LTLIBRARIES = \
+	libpigeonhole_settings.la
+
+libpigeonhole_settings_la_SOURCES = \
+	pigeonhole-settings.c
diff --git a/pigeonhole/src/plugins/settings/Makefile.in b/pigeonhole/src/plugins/settings/Makefile.in
new file mode 100644
index 0000000..ee34c03
--- /dev/null
+++ b/pigeonhole/src/plugins/settings/Makefile.in
@@ -0,0 +1,737 @@
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+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
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+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
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+      -[JT]) skip_next=yes;; \
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+      *$$target_option*) has_opt=yes; break;; \
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+	     $$unique
+
+GTAGS:
+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
+	  && gtags -i $(GTAGS_ARGS) "$$here"
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+	esac; \
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+	  if test -f "$$i"; then \
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+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
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+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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diff --git a/pigeonhole/src/plugins/settings/pigeonhole-settings.c b/pigeonhole/src/plugins/settings/pigeonhole-settings.c
new file mode 100644
index 0000000..21f8e85
--- /dev/null
+++ b/pigeonhole/src/plugins/settings/pigeonhole-settings.c
@@ -0,0 +1,13 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "pigeonhole-config.h"
+#include "pigeonhole-version.h"
+
+/* This is currently just a dummy plugin that adds a Pigeonhole
+ * version banner the doveconf output.
+ */
+
+const char *pigeonhole_settings_version = DOVECOT_ABI_VERSION;
+const char *pigeonhole_settings_doveconf_banner = "Pigeonhole version "PIGEONHOLE_VERSION_FULL;
diff --git a/pigeonhole/src/plugins/sieve-extprograms/Makefile.am b/pigeonhole/src/plugins/sieve-extprograms/Makefile.am
new file mode 100644
index 0000000..ab7844f
--- /dev/null
+++ b/pigeonhole/src/plugins/sieve-extprograms/Makefile.am
@@ -0,0 +1,34 @@
+sieve_plugindir = $(dovecot_moduledir)/sieve
+
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+
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+
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+    -I$(top_srcdir)/src/lib-sieve \
+    -I$(top_srcdir)/src/lib-sieve/util \
+	-I$(top_srcdir)/src/lib-sieve/plugins/copy \
+	-I$(top_srcdir)/src/lib-sieve/plugins/variables \
+	$(LIBDOVECOT_INCLUDE) \
+	-DPKG_RUNDIR=\""$(rundir)"\"
+
+commands = \
+	cmd-pipe.c \
+	cmd-filter.c \
+	cmd-execute.c
+
+extensions = \
+	ext-pipe.c \
+	ext-filter.c \
+	ext-execute.c
+
+lib90_sieve_extprograms_plugin_la_SOURCES = \
+	$(commands) \
+	$(extensions) \
+	sieve-extprograms-common.c \
+	sieve-extprograms-plugin.c
+
+noinst_HEADERS = \
+	sieve-extprograms-common.h \
+	sieve-extprograms-plugin.h
+
diff --git a/pigeonhole/src/plugins/sieve-extprograms/Makefile.in b/pigeonhole/src/plugins/sieve-extprograms/Makefile.in
new file mode 100644
index 0000000..e35da7b
--- /dev/null
+++ b/pigeonhole/src/plugins/sieve-extprograms/Makefile.in
@@ -0,0 +1,790 @@
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+sieve_plugin_LTLIBRARIES = lib90_sieve_extprograms_plugin.la
+lib90_sieve_extprograms_plugin_la_LDFLAGS = -module -avoid-version
+AM_CPPFLAGS = \
+    -I$(top_srcdir)/src/lib-sieve \
+    -I$(top_srcdir)/src/lib-sieve/util \
+	-I$(top_srcdir)/src/lib-sieve/plugins/copy \
+	-I$(top_srcdir)/src/lib-sieve/plugins/variables \
+	$(LIBDOVECOT_INCLUDE) \
+	-DPKG_RUNDIR=\""$(rundir)"\"
+
+commands = \
+	cmd-pipe.c \
+	cmd-filter.c \
+	cmd-execute.c
+
+extensions = \
+	ext-pipe.c \
+	ext-filter.c \
+	ext-execute.c
+
+lib90_sieve_extprograms_plugin_la_SOURCES = \
+	$(commands) \
+	$(extensions) \
+	sieve-extprograms-common.c \
+	sieve-extprograms-plugin.c
+
+noinst_HEADERS = \
+	sieve-extprograms-common.h \
+	sieve-extprograms-plugin.h
+
+all: all-am
+
+.SUFFIXES:
+.SUFFIXES: .c .lo .o .obj
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/plugins/sieve-extprograms/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/plugins/sieve-extprograms/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4): @MAINTAINER_MODE_TRUE@ $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+
+install-sieve_pluginLTLIBRARIES: $(sieve_plugin_LTLIBRARIES)
+	@$(NORMAL_INSTALL)
+	@list='$(sieve_plugin_LTLIBRARIES)'; test -n "$(sieve_plugindir)" || list=; \
+	list2=; for p in $$list; do \
+	  if test -f $$p; then \
+	    list2="$$list2 $$p"; \
+	  else :; fi; \
+	done; \
+	test -z "$$list2" || { \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(sieve_plugindir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(sieve_plugindir)" || exit 1; \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL) $(INSTALL_STRIP_FLAG) $$list2 '$(DESTDIR)$(sieve_plugindir)'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL) $(INSTALL_STRIP_FLAG) $$list2 "$(DESTDIR)$(sieve_plugindir)"; \
+	}
+
+uninstall-sieve_pluginLTLIBRARIES:
+	@$(NORMAL_UNINSTALL)
+	@list='$(sieve_plugin_LTLIBRARIES)'; test -n "$(sieve_plugindir)" || list=; \
+	for p in $$list; do \
+	  $(am__strip_dir) \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f '$(DESTDIR)$(sieve_plugindir)/$$f'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f "$(DESTDIR)$(sieve_plugindir)/$$f"; \
+	done
+
+clean-sieve_pluginLTLIBRARIES:
+	-test -z "$(sieve_plugin_LTLIBRARIES)" || rm -f $(sieve_plugin_LTLIBRARIES)
+	@list='$(sieve_plugin_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+lib90_sieve_extprograms_plugin.la: $(lib90_sieve_extprograms_plugin_la_OBJECTS) $(lib90_sieve_extprograms_plugin_la_DEPENDENCIES) $(EXTRA_lib90_sieve_extprograms_plugin_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(lib90_sieve_extprograms_plugin_la_LINK) -rpath $(sieve_plugindir) $(lib90_sieve_extprograms_plugin_la_OBJECTS) $(lib90_sieve_extprograms_plugin_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/cmd-execute.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/cmd-filter.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/cmd-pipe.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-execute.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-filter.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-pipe.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/sieve-extprograms-common.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/sieve-extprograms-plugin.Plo@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
+am--depfiles: $(am__depfiles_remade)
+
+.c.o:
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+
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+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LTCOMPILE) -c -o $@ $<
+
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+
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+
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+	$(am__define_uniq_tagged_files); mkid -fID $$unique
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+	      $$unique; \
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+	  else \
+	    echo "$$sdir/$$i"; \
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+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
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+	case $$dist_files in \
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+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
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+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(LTLIBRARIES) $(HEADERS)
+installdirs:
+	for dir in "$(DESTDIR)$(sieve_plugindir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-sieve_pluginLTLIBRARIES \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/cmd-execute.Plo
+	-rm -f ./$(DEPDIR)/cmd-filter.Plo
+	-rm -f ./$(DEPDIR)/cmd-pipe.Plo
+	-rm -f ./$(DEPDIR)/ext-execute.Plo
+	-rm -f ./$(DEPDIR)/ext-filter.Plo
+	-rm -f ./$(DEPDIR)/ext-pipe.Plo
+	-rm -f ./$(DEPDIR)/sieve-extprograms-common.Plo
+	-rm -f ./$(DEPDIR)/sieve-extprograms-plugin.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
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+html: html-am
+
+html-am:
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+info: info-am
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+install-dvi-am:
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+install-ps-am:
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+installcheck-am:
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+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/cmd-execute.Plo
+	-rm -f ./$(DEPDIR)/cmd-filter.Plo
+	-rm -f ./$(DEPDIR)/cmd-pipe.Plo
+	-rm -f ./$(DEPDIR)/ext-execute.Plo
+	-rm -f ./$(DEPDIR)/ext-filter.Plo
+	-rm -f ./$(DEPDIR)/ext-pipe.Plo
+	-rm -f ./$(DEPDIR)/sieve-extprograms-common.Plo
+	-rm -f ./$(DEPDIR)/sieve-extprograms-plugin.Plo
+	-rm -f Makefile
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+	mostlyclean-libtool
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+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libtool clean-sieve_pluginLTLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-ps install-ps-am \
+	install-sieve_pluginLTLIBRARIES install-strip installcheck \
+	installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am \
+	uninstall-sieve_pluginLTLIBRARIES
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/plugins/sieve-extprograms/cmd-execute.c b/pigeonhole/src/plugins/sieve-extprograms/cmd-execute.c
new file mode 100644
index 0000000..79f6663
--- /dev/null
+++ b/pigeonhole/src/plugins/sieve-extprograms/cmd-execute.c
@@ -0,0 +1,488 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "array.h"
+#include "buffer.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "istream.h"
+#include "ostream.h"
+
+#include "sieve-common.h"
+#include "sieve-stringlist.h"
+#include "sieve-binary.h"
+#include "sieve-code.h"
+#include "sieve-message.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-actions.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-result.h"
+
+#include "sieve-ext-variables.h"
+
+#include "sieve-extprograms-common.h"
+
+/* Execute command
+ *
+ * Syntax:
+ *   "execute" [":input" <input-data: string> / ":pipe"]
+ *             [":output" <varname: string>]
+ *             <program-name: string> [<arguments: string-list>]
+ *
+ */
+
+static bool
+cmd_execute_registered(struct sieve_validator *valdtr,
+		       const struct sieve_extension *ext,
+		       struct sieve_command_registration *cmd_reg);
+static bool
+cmd_execute_generate(const struct sieve_codegen_env *cgenv,
+		     struct sieve_command *ctx);
+
+const struct sieve_command_def sieve_cmd_execute = {
+	.identifier = "execute",
+	.type = SCT_HYBRID,
+	.positional_args = -1, /* We check positional arguments ourselves */
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = cmd_execute_registered,
+	.validate = sieve_extprogram_command_validate,
+	.generate = cmd_execute_generate,
+};
+
+/*
+ * Tagged arguments
+ */
+
+static bool
+cmd_execute_validate_input_tag(struct sieve_validator *valdtr,
+			       struct sieve_ast_argument **arg,
+			       struct sieve_command *cmd);
+static bool
+cmd_execute_generate_input_tag(const struct sieve_codegen_env *cgenv,
+			       struct sieve_ast_argument *arg,
+			       struct sieve_command *cmd);
+
+static bool
+cmd_execute_validate_output_tag(struct sieve_validator *valdtr,
+				struct sieve_ast_argument **arg,
+				struct sieve_command *cmd);
+
+static const struct sieve_argument_def execute_input_tag = {
+	.identifier = "input",
+	.validate = cmd_execute_validate_input_tag,
+	.generate = cmd_execute_generate_input_tag
+};
+
+static const struct sieve_argument_def execute_pipe_tag = {
+	.identifier = "pipe",
+	.validate = cmd_execute_validate_input_tag,
+	.generate = cmd_execute_generate_input_tag
+};
+
+static const struct sieve_argument_def execute_output_tag = {
+	.identifier = "output",
+	.validate = cmd_execute_validate_output_tag,
+};
+
+
+/*
+ * Execute operation
+ */
+
+static bool
+cmd_execute_operation_dump(const struct sieve_dumptime_env *denv,
+			   sieve_size_t *address);
+static int
+cmd_execute_operation_execute(const struct sieve_runtime_env *renv,
+			      sieve_size_t *address);
+
+const struct sieve_operation_def sieve_opr_execute = {
+	.mnemonic = "EXECUTE",
+	.ext_def = &sieve_ext_vnd_execute,
+	.dump = cmd_execute_operation_dump,
+	.execute = cmd_execute_operation_execute
+};
+
+/* Codes for optional operands */
+
+enum cmd_execute_optional {
+  OPT_END,
+  OPT_INPUT,
+  OPT_OUTPUT
+};
+
+/*
+ * Tag validation
+ */
+
+static bool
+cmd_execute_validate_input_tag(struct sieve_validator *valdtr,
+			       struct sieve_ast_argument **arg,
+			       struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+
+	if ((bool)cmd->data) {
+		sieve_argument_validate_error(
+			valdtr, *arg,
+			"multiple :input or :pipe arguments specified for the %s %s",
+			sieve_command_identifier(cmd),
+			sieve_command_type_name(cmd));
+		return FALSE;
+	}
+
+	cmd->data = (void *)TRUE;
+
+	/* Skip tag */
+ 	*arg = sieve_ast_argument_next(*arg);
+
+	if (sieve_argument_is(tag, execute_input_tag)) {
+		/* Check syntax:
+		 *   :input <input-data: string>
+		 */
+		if (!sieve_validate_tag_parameter(valdtr, cmd, tag, *arg, NULL,
+						  0, SAAT_STRING, FALSE))
+			return FALSE;
+
+		/* Assign tag parameters */
+		tag->parameters = *arg;
+		*arg = sieve_ast_arguments_detach(*arg,1);
+	}
+
+	return TRUE;
+}
+
+static bool
+cmd_execute_validate_output_tag(struct sieve_validator *valdtr,
+				struct sieve_ast_argument **arg,
+				struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+	struct sieve_extprograms_config *ext_config =
+		(struct sieve_extprograms_config *)cmd->ext->context;
+
+	if (ext_config == NULL || ext_config->var_ext == NULL ||
+	    !sieve_ext_variables_is_active(ext_config->var_ext, valdtr)) {
+		sieve_argument_validate_error(
+			valdtr,*arg,
+			"the %s %s only allows for the specification of an "
+			":output argument when the variables extension is active",
+			sieve_command_identifier(cmd),
+			sieve_command_type_name(cmd));
+		return FALSE;
+	}
+
+	/* Detach the tag itself */
+	*arg = sieve_ast_arguments_detach(*arg, 1);
+
+	if (!sieve_variable_argument_activate(ext_config->var_ext,
+					      ext_config->var_ext, valdtr,
+					      cmd, *arg, TRUE))
+		return FALSE;
+
+	(*arg)->argument->id_code = tag->argument->id_code;
+
+	/* Skip parameter */
+	*arg = sieve_ast_argument_next(*arg);
+
+	return TRUE;
+}
+
+/*
+ * Command registration
+ */
+
+static bool
+cmd_execute_registered(struct sieve_validator *valdtr,
+		       const struct sieve_extension *ext,
+		       struct sieve_command_registration *cmd_reg)
+{
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &execute_input_tag, OPT_INPUT);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &execute_pipe_tag, OPT_INPUT);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &execute_output_tag, OPT_OUTPUT);
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool
+cmd_execute_generate_input_tag(const struct sieve_codegen_env *cgenv,
+			       struct sieve_ast_argument *arg,
+			       struct sieve_command *cmd)
+{
+	if (arg->parameters == NULL) {
+		sieve_opr_omitted_emit(cgenv->sblock);
+		return TRUE;
+	}
+
+	return sieve_generate_argument_parameters(cgenv, cmd, arg);
+}
+
+static bool
+cmd_execute_generate(const struct sieve_codegen_env *cgenv,
+		     struct sieve_command *cmd)
+{
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &sieve_opr_execute);
+
+	/* Emit is_test flag */
+	sieve_binary_emit_byte(cgenv->sblock,
+			       (uint8_t)(cmd->ast_node->type == SAT_TEST ?
+					 1 : 0));
+
+	/* Generate arguments */
+	if (!sieve_generate_arguments(cgenv, cmd, NULL))
+		return FALSE;
+
+	/* Emit a placeholder when the <arguments> argument is missing */
+	if (sieve_ast_argument_next(cmd->first_positional) == NULL)
+		sieve_opr_omitted_emit(cgenv->sblock);
+
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+cmd_execute_operation_dump(const struct sieve_dumptime_env *denv,
+			   sieve_size_t *address)
+{
+	int opt_code = 0;
+	unsigned int is_test = 0;
+
+	/* Read is_test flag */
+	if (!sieve_binary_read_byte(denv->sblock, address, &is_test))
+		return FALSE;
+
+	sieve_code_dumpf(denv, "EXECUTE (%s)",
+			 (is_test > 0 ? "test" : "command"));
+	sieve_code_descend(denv);
+
+	/* Dump optional operands */
+	for (;;) {
+		int opt;
+		bool opok = TRUE;
+
+		if ((opt = sieve_action_opr_optional_dump(denv, address,
+							  &opt_code)) < 0)
+			return FALSE;
+
+		if (opt == 0)
+			break;
+
+		switch (opt_code) {
+		case OPT_INPUT:
+			opok = sieve_opr_string_dump_ex(denv, address,
+							"input", "PIPE");
+			break;
+		case OPT_OUTPUT:
+			opok = sieve_opr_string_dump(denv, address, "output");
+			break;
+		default:
+			return FALSE;
+		}
+
+		if (!opok)
+			return FALSE;
+	}
+
+	if (!sieve_opr_string_dump(denv, address, "program-name"))
+		return FALSE;
+
+	return sieve_opr_stringlist_dump_ex(denv, address, "arguments", "");
+}
+
+/*
+ * Code execution
+ */
+
+static int
+cmd_execute_operation_execute(const struct sieve_runtime_env *renv,
+			      sieve_size_t *address)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	const struct sieve_extension *this_ext = renv->oprtn->ext;
+	struct sieve_side_effects_list *slist = NULL;
+	int opt_code = 0;
+	unsigned int is_test = 0;
+	struct sieve_stringlist *args_list = NULL;
+	string_t *pname = NULL, *input = NULL;
+	struct sieve_variable_storage *var_storage = NULL;
+	unsigned int var_index;
+	bool have_input = FALSE;
+	const char *program_name = NULL;
+	const char *const *args = NULL;
+	enum sieve_error error = SIEVE_ERROR_NONE;
+	buffer_t *outbuf = NULL;
+	struct sieve_extprogram *sprog = NULL;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* The is_test flag */
+	if (!sieve_binary_read_byte(renv->sblock, address, &is_test)) {
+		sieve_runtime_trace_error(renv, "invalid is_test flag");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	/* Optional operands */
+
+	for (;;) {
+		int opt;
+
+		if ((opt = sieve_action_opr_optional_read(
+			renv, address, &opt_code, &ret, &slist)) < 0)
+			return ret;
+
+		if (opt == 0)
+			break;
+
+		switch (opt_code) {
+		case OPT_INPUT:
+			ret = sieve_opr_string_read_ex(renv, address, "input",
+						       TRUE, &input, NULL);
+			have_input = TRUE;
+			break;
+		case OPT_OUTPUT:
+			ret = sieve_variable_operand_read(
+				renv, address, "output", &var_storage,
+				&var_index);
+			break;
+		default:
+			sieve_runtime_trace_error(
+				renv, "unknown optional operand");
+			return SIEVE_EXEC_BIN_CORRUPT;
+		}
+
+		if (ret <= 0)
+			return ret;
+	}
+
+	/* Fixed operands */
+
+	if ((ret = sieve_extprogram_command_read_operands(
+		renv, address, &pname, &args_list)) <= 0)
+		return ret;
+
+	program_name = str_c(pname);
+	if (args_list != NULL &&
+	    sieve_stringlist_read_all(args_list, pool_datastack_create(),
+				      &args) < 0) {
+		sieve_runtime_trace_error(renv, "failed to read args operand");
+		return args_list->exec_status;
+	}
+
+	/*
+	 * Perform operation
+	 */
+
+	/* Trace */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_ACTIONS, "execute action");
+	sieve_runtime_trace_descend(renv);
+	sieve_runtime_trace(renv, SIEVE_TRLVL_ACTIONS,
+			    "execute program `%s'",
+			    str_sanitize(program_name, 128));
+
+	sprog = sieve_extprogram_create(this_ext, eenv->scriptenv,
+					eenv->msgdata, "execute",
+					program_name, args, &error);
+	if (sprog != NULL) {
+		if (var_storage != NULL) {
+			// FIXME: limit output size
+			struct ostream *outdata;
+
+			outbuf = buffer_create_dynamic(default_pool, 1024);
+			outdata = o_stream_create_buffer(outbuf);
+			sieve_extprogram_set_output(sprog, outdata);
+			o_stream_unref(&outdata);
+		}
+
+		if (input == NULL && have_input) {
+			struct mail *mail = sieve_message_get_mail(renv->msgctx);
+
+			if (sieve_extprogram_set_input_mail(sprog, mail) < 0) {
+				sieve_extprogram_destroy(&sprog);
+				if (outbuf != NULL)
+					buffer_free(&outbuf);
+				return sieve_runtime_mail_error(
+					renv, mail, "execute action: "
+					"failed to read input message");
+			}
+			ret = 1;
+		} else if (input != NULL) {
+			struct istream *indata =
+				i_stream_create_from_data(str_data(input),
+							  str_len(input));
+			sieve_extprogram_set_input(sprog, indata);
+			i_stream_unref(&indata);
+			ret = 1;
+		}
+
+		if (ret >= 0)
+			ret = sieve_extprogram_run(sprog);
+		sieve_extprogram_destroy(&sprog);
+	} else {
+		ret = -1;
+	}
+
+	if (ret > 0) {
+		sieve_runtime_trace(renv, SIEVE_TRLVL_ACTIONS,
+				    "executed program successfully");
+
+		if (var_storage != NULL) {
+			string_t *var;
+
+			if (sieve_variable_get_modifiable(var_storage,
+							  var_index, &var)) {
+				str_truncate(var, 0);
+				str_append_str(var, outbuf);
+
+				sieve_runtime_trace(renv, SIEVE_TRLVL_ACTIONS,
+						    "assigned output variable");
+			} // FIXME: handle failure
+		}
+
+	} else if (ret < 0) {
+		if (error == SIEVE_ERROR_NOT_FOUND) {
+			sieve_runtime_error(
+				renv, NULL,
+				"execute action: program `%s' not found",
+				str_sanitize(program_name, 80));
+		} else {
+			sieve_extprogram_exec_error(
+				renv->ehandler,
+				sieve_runtime_get_full_command_location(renv),
+				"execute action: failed to execute to program `%s'",
+				str_sanitize(program_name, 80));
+		}
+	} else {
+		sieve_runtime_trace(renv, SIEVE_TRLVL_ACTIONS,
+				    "execute action: "
+				    "program indicated false result");
+	}
+
+	if (outbuf != NULL)
+		buffer_free(&outbuf);
+
+	if (is_test > 0) {
+		sieve_interpreter_set_test_result(renv->interp, (ret > 0));
+		return SIEVE_EXEC_OK;
+	}
+	return (ret >= 0 ? SIEVE_EXEC_OK : SIEVE_EXEC_FAILURE);
+}
diff --git a/pigeonhole/src/plugins/sieve-extprograms/cmd-filter.c b/pigeonhole/src/plugins/sieve-extprograms/cmd-filter.c
new file mode 100644
index 0000000..7118ff1
--- /dev/null
+++ b/pigeonhole/src/plugins/sieve-extprograms/cmd-filter.c
@@ -0,0 +1,254 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "array.h"
+#include "buffer.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "istream.h"
+#include "ostream.h"
+#include "safe-mkstemp.h"
+#include "mail-user.h"
+
+#include "sieve-common.h"
+#include "sieve-stringlist.h"
+#include "sieve-binary.h"
+#include "sieve-code.h"
+#include "sieve-message.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-actions.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-result.h"
+
+#include "sieve-ext-variables.h"
+
+#include "sieve-extprograms-common.h"
+
+/* Filter command
+ *
+ * Syntax:
+ *   "filter" <program-name: string> [<arguments: string-list>]
+ *
+ */
+
+static bool
+cmd_filter_generate(const struct sieve_codegen_env *cgenv,
+		    struct sieve_command *ctx);
+
+const struct sieve_command_def sieve_cmd_filter = {
+	.identifier = "filter",
+	.type = SCT_HYBRID,
+	.positional_args = -1, /* We check positional arguments ourselves */
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = sieve_extprogram_command_validate,
+	.generate = cmd_filter_generate
+};
+
+/* 
+ * Filter operation 
+ */
+
+static bool
+cmd_filter_operation_dump(const struct sieve_dumptime_env *denv,
+			  sieve_size_t *address);
+static int
+cmd_filter_operation_execute(const struct sieve_runtime_env *renv,
+			     sieve_size_t *address);
+
+const struct sieve_operation_def sieve_opr_filter = {
+	.mnemonic = "FILTER",
+	.ext_def = &sieve_ext_vnd_filter,
+	.dump = cmd_filter_operation_dump, 
+	.execute = cmd_filter_operation_execute
+};
+
+/*
+ * Code generation
+ */
+
+static bool
+cmd_filter_generate(const struct sieve_codegen_env *cgenv,
+		    struct sieve_command *cmd)
+{
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &sieve_opr_filter);
+
+	/* Emit is_test flag */
+	sieve_binary_emit_byte(cgenv->sblock,
+			       (uint8_t)(cmd->ast_node->type == SAT_TEST ?
+					 1 : 0));
+
+	/* Generate arguments */
+	if (!sieve_generate_arguments(cgenv, cmd, NULL))
+		return FALSE;
+
+	/* Emit a placeholder when the <arguments> argument is missing */
+	if (sieve_ast_argument_next(cmd->first_positional) == NULL)
+		sieve_opr_omitted_emit(cgenv->sblock);
+	return TRUE;
+}
+
+/* 
+ * Code dump
+ */
+ 
+static bool
+cmd_filter_operation_dump(const struct sieve_dumptime_env *denv,
+			  sieve_size_t *address)
+{	
+	unsigned int is_test = 0;
+
+	/* Read is_test flag */
+	if (!sieve_binary_read_byte(denv->sblock, address, &is_test))
+		return FALSE;
+
+	sieve_code_dumpf(denv, "FILTER (%s)",
+			 (is_test > 0 ? "test" : "command"));
+	sieve_code_descend(denv);		
+
+	/* Dump optional operands */
+	if (sieve_action_opr_optional_dump(denv, address, NULL) != 0)
+		return FALSE;
+
+	if (!sieve_opr_string_dump(denv, address, "program-name"))
+		return FALSE;
+
+	return sieve_opr_stringlist_dump_ex(denv, address, "arguments", "");
+}
+
+/* 
+ * Code execution
+ */
+
+static int
+cmd_filter_operation_execute(const struct sieve_runtime_env *renv,
+			     sieve_size_t *address)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	const struct sieve_extension *this_ext = renv->oprtn->ext;
+	unsigned int is_test = 0;
+	struct sieve_stringlist *args_list = NULL;
+	enum sieve_error error = SIEVE_ERROR_NONE;
+	string_t *pname = NULL;
+	const char *program_name = NULL;
+	const char *const *args = NULL;
+	struct istream *newmsg = NULL;
+	struct sieve_extprogram *sprog;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* The is_test flag */
+
+	if (!sieve_binary_read_byte(renv->sblock, address, &is_test)) {
+		sieve_runtime_trace_error(renv, "invalid is_test flag");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	/* Optional operands */	
+
+	if (sieve_action_opr_optional_read(renv, address, NULL,
+					   &ret, NULL) != 0)
+		return ret;
+
+	/* Fixed operands */
+
+	if ((ret = sieve_extprogram_command_read_operands(renv, address, &pname,
+							  &args_list)) <= 0)
+		return ret;
+
+	program_name = str_c(pname);
+	if (args_list != NULL &&
+	    sieve_stringlist_read_all(args_list, pool_datastack_create(),
+				      &args) < 0) {
+		sieve_runtime_trace_error(renv, "failed to read args operand");
+		return args_list->exec_status;
+	}
+
+	/*
+	 * Perform operation
+	 */
+
+	/* Trace */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_ACTIONS, "filter action");
+	sieve_runtime_trace_descend(renv);
+	sieve_runtime_trace(renv, SIEVE_TRLVL_ACTIONS,
+		"execute program `%s'", str_sanitize(program_name, 128));
+
+	sprog = sieve_extprogram_create(this_ext, eenv->scriptenv,
+					eenv->msgdata, "filter",
+					program_name, args, &error);
+	if (sprog != NULL) {
+		struct mail *mail = sieve_message_get_mail(renv->msgctx);
+
+		if (sieve_extprogram_set_input_mail(sprog, mail) < 0) {
+			sieve_extprogram_destroy(&sprog);
+			return sieve_runtime_mail_error(
+				renv, mail,
+				"filter action: failed to read input message");
+		}
+		sieve_extprogram_set_output_seekable(sprog);
+		ret = sieve_extprogram_run(sprog);
+	} else {
+		ret = -1;
+	}
+
+	if (ret > 0)
+		newmsg = sieve_extprogram_get_output_seekable(sprog);
+	if (sprog != NULL)
+		sieve_extprogram_destroy(&sprog);
+
+	if (ret > 0 && newmsg != NULL) {
+		sieve_runtime_trace(renv, SIEVE_TRLVL_ACTIONS,
+				    "executed program successfully");
+
+		i_stream_set_name(newmsg, t_strdup_printf("filter %s output",
+							  program_name));
+		newmsg->blocking = TRUE;
+		if ((ret = sieve_message_substitute(renv->msgctx,
+						    newmsg)) >= 0) {
+			sieve_runtime_trace(renv, SIEVE_TRLVL_ACTIONS,
+					    "changed message");
+		} else {
+			sieve_runtime_critical(renv, NULL, "filter action",
+					       "filter action: "
+					       "failed to substitute message"); 
+		}
+
+		i_stream_unref(&newmsg);
+	} else if (ret < 0) {
+		if (error == SIEVE_ERROR_NOT_FOUND) {
+			sieve_runtime_error(renv, NULL, "filter action: "
+					    "program `%s' not found",
+					    str_sanitize(program_name, 80));
+		} else {
+			sieve_extprogram_exec_error(
+				renv->ehandler,
+				sieve_runtime_get_full_command_location(renv),
+				"filter action: "
+				"failed to execute to program `%s'",
+				str_sanitize(program_name, 80));
+		}
+
+	} else {
+		sieve_runtime_trace(renv, SIEVE_TRLVL_ACTIONS, "filter action: "
+				    "program indicated false result");
+	}
+
+	if (is_test > 0) {
+		sieve_interpreter_set_test_result(renv->interp, (ret > 0));
+
+		return SIEVE_EXEC_OK;
+	}
+
+	return (ret >= 0 ? SIEVE_EXEC_OK : SIEVE_EXEC_FAILURE);
+}
diff --git a/pigeonhole/src/plugins/sieve-extprograms/cmd-pipe.c b/pigeonhole/src/plugins/sieve-extprograms/cmd-pipe.c
new file mode 100644
index 0000000..f5a5c34
--- /dev/null
+++ b/pigeonhole/src/plugins/sieve-extprograms/cmd-pipe.c
@@ -0,0 +1,457 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "array.h"
+#include "str.h"
+#include "str-sanitize.h"
+
+#include "sieve-common.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-message.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-actions.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+#include "sieve-result.h"
+
+#include "sieve-extprograms-common.h"
+
+/* Pipe command
+ *
+ * Syntax:
+ *   pipe [":copy"] [":try"] <program-name: string> [<arguments: string-list>]
+ *
+ */
+
+static bool
+cmd_pipe_registered(struct sieve_validator *valdtr,
+		    const struct sieve_extension *ext,
+		    struct sieve_command_registration *cmd_reg);
+static bool
+cmd_pipe_generate(const struct sieve_codegen_env *cgenv,
+		  struct sieve_command *ctx);
+
+const struct sieve_command_def sieve_cmd_pipe = {
+	.identifier = "pipe",
+	.type = SCT_COMMAND,
+	.positional_args = -1, /* We check positional arguments ourselves */
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = cmd_pipe_registered,
+	.validate = sieve_extprogram_command_validate,
+	.generate = cmd_pipe_generate,
+};
+
+/*
+ * Tagged arguments
+ */
+
+static const struct sieve_argument_def pipe_try_tag = {
+	.identifier = "try",
+};
+
+/*
+ * Pipe operation
+ */
+
+static bool
+cmd_pipe_operation_dump(const struct sieve_dumptime_env *denv,
+			sieve_size_t *address);
+static int
+cmd_pipe_operation_execute(const struct sieve_runtime_env *renv,
+			   sieve_size_t *address);
+
+const struct sieve_operation_def sieve_opr_pipe = {
+	.mnemonic = "PIPE",
+	.ext_def = &sieve_ext_vnd_pipe,
+	.dump = cmd_pipe_operation_dump,
+	.execute = cmd_pipe_operation_execute,
+};
+
+/* Codes for optional operands */
+
+enum cmd_pipe_optional {
+	OPT_END,
+	OPT_TRY,
+};
+
+/*
+ * Pipe action
+ */
+
+/* Forward declarations */
+
+static int
+act_pipe_check_duplicate(const struct sieve_runtime_env *renv,
+			 const struct sieve_action *act,
+			 const struct sieve_action *act_other);
+static void
+act_pipe_print(const struct sieve_action *action,
+	       const struct sieve_result_print_env *rpenv,
+	       bool *keep);
+static int
+act_pipe_start(const struct sieve_action_exec_env *aenv, void **tr_context);
+static int
+act_pipe_execute(const struct sieve_action_exec_env *aenv,
+		void *tr_context, bool *keep);
+static int
+act_pipe_commit(const struct sieve_action_exec_env *aenv,
+		void *tr_context);
+static void
+act_pipe_rollback(const struct sieve_action_exec_env *aenv,
+		  void *tr_context, bool success);
+
+/* Action object */
+
+const struct sieve_action_def act_pipe = {
+	.name = "pipe",
+	.flags = SIEVE_ACTFLAG_TRIES_DELIVER,
+	.check_duplicate = act_pipe_check_duplicate,
+	.print = act_pipe_print,
+	.start = act_pipe_start,
+	.execute = act_pipe_execute,
+	.commit = act_pipe_commit,
+	.rollback = act_pipe_rollback,
+};
+
+/* Action context information */
+
+struct ext_pipe_action {
+	const char *program_name;
+	const char * const *args;
+	bool try;
+};
+
+/*
+ * Command registration
+ */
+
+static bool
+cmd_pipe_registered(struct sieve_validator *valdtr,
+		    const struct sieve_extension *ext,
+		    struct sieve_command_registration *cmd_reg)
+{
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &pipe_try_tag, OPT_TRY);
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool
+cmd_pipe_generate(const struct sieve_codegen_env *cgenv,
+		  struct sieve_command *cmd)
+{
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &sieve_opr_pipe);
+
+	/* Generate arguments */
+	if (!sieve_generate_arguments(cgenv, cmd, NULL))
+		return FALSE;
+
+	/* Emit a placeholder when the <arguments> argument is missing */
+	if (sieve_ast_argument_next(cmd->first_positional) == NULL)
+		sieve_opr_omitted_emit(cgenv->sblock);
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+cmd_pipe_operation_dump(const struct sieve_dumptime_env *denv,
+			sieve_size_t *address)
+{
+	int opt_code = 0;
+
+	sieve_code_dumpf(denv, "PIPE");
+	sieve_code_descend(denv);
+
+	/* Dump optional operands */
+	for (;;) {
+		int opt;
+
+		if ((opt = sieve_action_opr_optional_dump(denv, address,
+							  &opt_code)) < 0)
+			return FALSE;
+
+		if (opt == 0)
+			break;
+
+		switch (opt_code) {
+		case OPT_TRY:
+			sieve_code_dumpf(denv, "try");
+			break;
+		default:
+			return FALSE;
+		}
+	}
+
+	if (!sieve_opr_string_dump(denv, address, "program-name"))
+		return FALSE;
+
+	return sieve_opr_stringlist_dump_ex(denv, address, "arguments", "");
+}
+
+/*
+ * Code execution
+ */
+
+static int
+cmd_pipe_operation_execute(const struct sieve_runtime_env *renv,
+			   sieve_size_t *address)
+{
+	const struct sieve_extension *this_ext = renv->oprtn->ext;
+	struct sieve_side_effects_list *slist = NULL;
+	struct ext_pipe_action *act;
+	pool_t pool;
+	int opt_code = 0;
+	struct sieve_stringlist *args_list = NULL;
+	string_t *pname = NULL;
+	bool try = FALSE;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Optional operands */
+
+	for (;;) {
+		int opt;
+
+		if ((opt = sieve_action_opr_optional_read(renv, address,
+							  &opt_code, &ret,
+							  &slist)) < 0)
+			return ret;
+
+		if (opt == 0)
+			break;
+
+		switch (opt_code) {
+		case OPT_TRY:
+			try = TRUE;
+			break;
+		default:
+			sieve_runtime_trace_error(
+				renv, "unknown optional operand");
+			return SIEVE_EXEC_BIN_CORRUPT;
+		}
+	}
+
+	/* Fixed operands */
+
+	if ((ret = sieve_extprogram_command_read_operands(renv, address, &pname,
+							  &args_list)) <= 0)
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	/* Trace */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_ACTIONS, "pipe action");
+
+	/* Compose action */
+
+	pool = sieve_result_pool(renv->result);
+	act = p_new(pool, struct ext_pipe_action, 1);
+
+	if (args_list != NULL &&
+	    sieve_stringlist_read_all(args_list, pool, &act->args) < 0) {
+		sieve_runtime_trace_error(renv, "failed to read args operand");
+		return args_list->exec_status;
+	}
+
+	act->program_name = p_strdup(pool, str_c(pname));
+	act->try = try;
+
+	if (sieve_result_add_action(renv, this_ext, "pipe", &act_pipe, slist,
+				    (void *)act, 0, TRUE) < 0)
+		return SIEVE_EXEC_FAILURE;
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Action
+ */
+
+/* Runtime verification */
+
+static int
+act_pipe_check_duplicate(const struct sieve_runtime_env *renv ATTR_UNUSED,
+			 const struct sieve_action *act,
+			 const struct sieve_action *act_other)
+{
+	struct ext_pipe_action *new_act, *old_act;
+
+	if (act->context == NULL || act_other->context == NULL)
+		return 0;
+
+	new_act = (struct ext_pipe_action *) act->context;
+	old_act = (struct ext_pipe_action *) act_other->context;
+
+	if (strcmp(new_act->program_name, old_act->program_name) == 0) {
+		sieve_runtime_error(renv, act->location,
+				    "duplicate pipe \"%s\" action not allowed "
+				    "(previously triggered one was here: %s)",
+				    new_act->program_name, act_other->location);
+		return -1;
+	}
+
+	return 0;
+}
+
+/* Result printing */
+
+static void
+act_pipe_print(const struct sieve_action *action,
+	       const struct sieve_result_print_env *rpenv,
+	       bool *keep ATTR_UNUSED)
+{
+	const struct ext_pipe_action *act =
+		(const struct ext_pipe_action *)action->context;
+
+	sieve_result_action_printf(
+		rpenv, "pipe message to external program '%s':",
+		act->program_name);
+
+	/* Print main method parameters */
+
+	sieve_result_printf(
+		rpenv, "    => try           : %s\n",
+		(act->try ? "yes" : "no"));
+
+	/* FIXME: print args */
+
+	/* Finish output with an empty line */
+	sieve_result_printf(rpenv, "\n");
+}
+
+/* Result execution */
+
+struct act_pipe_transaction {
+	struct sieve_extprogram *sprog;
+};
+
+static int
+act_pipe_start(const struct sieve_action_exec_env *aenv, void **tr_context)
+{
+	struct act_pipe_transaction *trans;
+	pool_t pool = sieve_result_pool(aenv->result);
+
+	/* Create transaction context */
+	trans = p_new(pool, struct act_pipe_transaction, 1);
+	*tr_context = (void *)trans;
+
+	return SIEVE_EXEC_OK;
+}
+
+static int
+act_pipe_execute(const struct sieve_action_exec_env *aenv,
+		 void *tr_context, bool *keep)
+{
+	const struct sieve_action *action = aenv->action;
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	const struct ext_pipe_action *act =
+		(const struct ext_pipe_action *)action->context;
+	struct act_pipe_transaction *trans = tr_context;
+	struct mail *mail = (action->mail != NULL ?
+		     action->mail :
+		     sieve_message_get_mail(aenv->msgctx));
+	enum sieve_error error = SIEVE_ERROR_NONE;
+
+	trans->sprog = sieve_extprogram_create(action->ext, eenv->scriptenv,
+					       eenv->msgdata, "pipe",
+					       act->program_name, act->args,
+					       &error);
+	if (trans->sprog != NULL) {
+		if (sieve_extprogram_set_input_mail(trans->sprog, mail) < 0) {
+			sieve_extprogram_destroy(&trans->sprog);
+			return sieve_result_mail_error(
+				aenv, mail, "failed to read input message");
+		}
+	}
+
+	*keep = FALSE;
+	return SIEVE_EXEC_OK;
+}
+
+static int
+act_pipe_commit(const struct sieve_action_exec_env *aenv,
+		void *tr_context ATTR_UNUSED)
+{
+	const struct sieve_action *action = aenv->action;
+	const struct sieve_execute_env *eenv = aenv->exec_env;
+	const struct ext_pipe_action *act =
+		(const struct ext_pipe_action *)action->context;
+	struct act_pipe_transaction *trans = tr_context;
+	enum sieve_error error = SIEVE_ERROR_NONE;
+	int ret;
+
+	if (trans->sprog != NULL) {
+		ret = sieve_extprogram_run(trans->sprog);
+		sieve_extprogram_destroy(&trans->sprog);
+	} else {
+		ret = -1;
+	}
+
+	if (ret > 0) {
+		struct event_passthrough *e =
+			sieve_action_create_finish_event(aenv)->
+			add_str("pipe_program",
+				str_sanitize(act->program_name, 256));
+
+		sieve_result_event_log(aenv, e->event(),
+				       "piped message to program `%s'",
+				       str_sanitize(act->program_name, 128));
+
+		/* Indicate that message was successfully 'forwarded' */
+		eenv->exec_status->message_forwarded = TRUE;
+	} else {
+		if (ret < 0) {
+			if (error == SIEVE_ERROR_NOT_FOUND) {
+				sieve_result_error(
+					aenv,
+					"failed to pipe message to program: "
+					"program `%s' not found",
+					str_sanitize(act->program_name, 80));
+			} else {
+				sieve_extprogram_exec_error(
+					aenv->ehandler, NULL,
+					"failed to pipe message to program `%s'",
+					str_sanitize(act->program_name, 80));
+			}
+		} else {
+			sieve_extprogram_exec_error(
+				aenv->ehandler, NULL,
+				"failed to execute to program `%s'",
+				str_sanitize(act->program_name, 80));
+		}
+
+		if (act->try)
+			return SIEVE_EXEC_OK;
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	return SIEVE_EXEC_OK;
+}
+
+static void
+act_pipe_rollback(const struct sieve_action_exec_env *aenv ATTR_UNUSED,
+		  void *tr_context, bool success ATTR_UNUSED)
+{
+	struct act_pipe_transaction *trans = tr_context;
+
+	if (trans->sprog != NULL)
+		sieve_extprogram_destroy(&trans->sprog);
+}
diff --git a/pigeonhole/src/plugins/sieve-extprograms/ext-execute.c b/pigeonhole/src/plugins/sieve-extprograms/ext-execute.c
new file mode 100644
index 0000000..055ee88
--- /dev/null
+++ b/pigeonhole/src/plugins/sieve-extprograms/ext-execute.c
@@ -0,0 +1,80 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension vnd.dovecot.execute
+ * -----------------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: vendor-defined; spec-bosch-sieve-extprograms
+ * Implementation: full
+ * Status: experimental
+ *
+ */
+
+#include "lib.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-binary.h"
+
+#include "sieve-validator.h"
+#include "sieve-interpreter.h"
+
+#include "sieve-ext-copy.h"
+
+#include "sieve-extprograms-common.h"
+
+/*
+ * Extension
+ */
+
+static bool ext_execute_load(const struct sieve_extension *ext, void **context);
+static void ext_execute_unload(const struct sieve_extension *ext);
+static bool ext_execute_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+	
+const struct sieve_extension_def sieve_ext_vnd_execute = {
+	.name = "vnd.dovecot.execute",
+	.load = ext_execute_load,
+	.unload = ext_execute_unload,
+	.validator_load = ext_execute_validator_load,
+	SIEVE_EXT_DEFINE_OPERATION(sieve_opr_execute)
+};
+
+/*
+ * Context
+ */
+
+static bool ext_execute_load(const struct sieve_extension *ext, void **context)
+{
+	if ( *context != NULL ) {
+		ext_execute_unload(ext);
+		*context = NULL;
+	}
+
+	*context = (void *)sieve_extprograms_config_init(ext);
+	return TRUE;
+}
+
+static void ext_execute_unload(const struct sieve_extension *ext)
+{
+	struct sieve_extprograms_config *ext_config = 
+		(struct sieve_extprograms_config *)ext->context;
+
+	if ( ext_config == NULL ) return;
+
+	sieve_extprograms_config_deinit(&ext_config);
+}
+
+/*
+ * Validation
+ */
+
+static bool ext_execute_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	/* Register commands */
+	sieve_validator_register_command(valdtr, ext, &sieve_cmd_execute);
+
+	return TRUE;
+}
diff --git a/pigeonhole/src/plugins/sieve-extprograms/ext-filter.c b/pigeonhole/src/plugins/sieve-extprograms/ext-filter.c
new file mode 100644
index 0000000..af1f8f1
--- /dev/null
+++ b/pigeonhole/src/plugins/sieve-extprograms/ext-filter.c
@@ -0,0 +1,80 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension vnd.dovecot.filter
+ * -----------------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: vendor-defined; spec-bosch-sieve-extprograms
+ * Implementation: full
+ * Status: experimental
+ *
+ */
+
+#include "lib.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-binary.h"
+
+#include "sieve-validator.h"
+#include "sieve-interpreter.h"
+
+#include "sieve-ext-copy.h"
+
+#include "sieve-extprograms-common.h"
+
+/*
+ * Extension
+ */
+
+static bool ext_filter_load(const struct sieve_extension *ext, void **context);
+static void ext_filter_unload(const struct sieve_extension *ext);
+static bool ext_filter_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+	
+const struct sieve_extension_def sieve_ext_vnd_filter = {
+	.name = "vnd.dovecot.filter",
+	.load = ext_filter_load,
+	.unload = ext_filter_unload,
+	.validator_load = ext_filter_validator_load,
+	SIEVE_EXT_DEFINE_OPERATION(sieve_opr_filter),
+};
+
+/*
+ * Context
+ */
+
+static bool ext_filter_load(const struct sieve_extension *ext, void **context)
+{
+	if ( *context != NULL ) {
+		ext_filter_unload(ext);
+		*context = NULL;
+	}
+
+	*context = (void *)sieve_extprograms_config_init(ext);
+	return TRUE;
+}
+
+static void ext_filter_unload(const struct sieve_extension *ext)
+{
+	struct sieve_extprograms_config *ext_config = 
+		(struct sieve_extprograms_config *)ext->context;
+
+	if ( ext_config == NULL ) return;
+
+	sieve_extprograms_config_deinit(&ext_config);
+}
+
+/*
+ * Validation
+ */
+
+static bool ext_filter_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	/* Register commands */
+	sieve_validator_register_command(valdtr, ext, &sieve_cmd_filter);
+
+	return TRUE;
+}
diff --git a/pigeonhole/src/plugins/sieve-extprograms/ext-pipe.c b/pigeonhole/src/plugins/sieve-extprograms/ext-pipe.c
new file mode 100644
index 0000000..5da7d36
--- /dev/null
+++ b/pigeonhole/src/plugins/sieve-extprograms/ext-pipe.c
@@ -0,0 +1,114 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension vnd.dovecot.pipe
+ * -----------------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: vendor-define; spec-bosch-sieve-extprograms
+ * Implementation: full
+ * Status: experimental
+ *
+ */
+
+#include "lib.h"
+
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-binary.h"
+
+#include "sieve-validator.h"
+#include "sieve-interpreter.h"
+
+#include "sieve-ext-copy.h"
+
+#include "sieve-extprograms-common.h"
+
+/*
+ * Extension
+ */
+
+static bool ext_pipe_load(const struct sieve_extension *ext, void **context);
+static void ext_pipe_unload(const struct sieve_extension *ext);
+static bool ext_pipe_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+	
+const struct sieve_extension_def sieve_ext_vnd_pipe = {
+	.name = "vnd.dovecot.pipe",
+	.load = ext_pipe_load,
+	.unload = ext_pipe_unload,
+	.validator_load = ext_pipe_validator_load,
+	SIEVE_EXT_DEFINE_OPERATION(sieve_opr_pipe),
+};
+
+/*
+ * Context
+ */
+
+static bool ext_pipe_load(const struct sieve_extension *ext, void **context)
+{
+	if ( *context != NULL ) {
+		ext_pipe_unload(ext);
+		*context = NULL;
+	}
+
+	*context = (void *)sieve_extprograms_config_init(ext);
+	return TRUE;
+}
+
+static void ext_pipe_unload(const struct sieve_extension *ext)
+{
+	struct sieve_extprograms_config *ext_config = 
+		(struct sieve_extprograms_config *)ext->context;
+
+	if ( ext_config == NULL ) return;
+
+	sieve_extprograms_config_deinit(&ext_config);
+}
+
+/*
+ * Validation
+ */
+
+static bool ext_pipe_validator_validate
+	(const struct sieve_extension *ext,
+		struct sieve_validator *valdtr, void *context,
+		struct sieve_ast_argument *require_arg,
+		bool required);
+
+static const struct sieve_validator_extension pipe_validator_extension = {
+	.ext = &sieve_ext_vnd_pipe,
+	.validate = ext_pipe_validator_validate
+};
+
+static bool ext_pipe_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	/* Register commands */
+	sieve_validator_register_command(valdtr, ext, &sieve_cmd_pipe);
+
+	/* Register extension to validator */
+	sieve_validator_extension_register
+		(valdtr, ext, &pipe_validator_extension, NULL);
+
+	return TRUE;
+}
+
+static bool ext_pipe_validator_validate
+(const struct sieve_extension *ext,
+	struct sieve_validator *valdtr, void *context ATTR_UNUSED,
+	struct sieve_ast_argument *require_arg ATTR_UNUSED,
+	bool required ATTR_UNUSED)
+{
+	struct sieve_extprograms_config *ext_config =
+		(struct sieve_extprograms_config *) ext->context;
+
+	if ( ext_config != NULL && ext_config->copy_ext != NULL ) {
+		/* Register :copy command tag */
+		sieve_ext_copy_register_tag(valdtr,
+			ext_config->copy_ext, sieve_cmd_pipe.identifier);
+	}
+	return TRUE;
+}
+
+
diff --git a/pigeonhole/src/plugins/sieve-extprograms/sieve-extprograms-common.c b/pigeonhole/src/plugins/sieve-extprograms/sieve-extprograms-common.c
new file mode 100644
index 0000000..3c9ff23
--- /dev/null
+++ b/pigeonhole/src/plugins/sieve-extprograms/sieve-extprograms-common.c
@@ -0,0 +1,648 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "lib-signals.h"
+#include "str.h"
+#include "strfuncs.h"
+#include "str-sanitize.h"
+#include "unichar.h"
+#include "array.h"
+#include "eacces-error.h"
+#include "smtp-params.h"
+#include "istream.h"
+#include "istream-crlf.h"
+#include "istream-header-filter.h"
+#include "ostream.h"
+#include "mail-user.h"
+#include "mail-storage.h"
+
+#include "program-client.h"
+
+#include "sieve-common.h"
+#include "sieve-settings.h"
+#include "sieve-error.h"
+#include "sieve-extensions.h"
+#include "sieve-ast.h"
+#include "sieve-commands.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-actions.h"
+#include "sieve-validator.h"
+#include "sieve-runtime.h"
+#include "sieve-interpreter.h"
+
+#include "sieve-ext-copy.h"
+#include "sieve-ext-variables.h"
+
+#include "sieve-extprograms-common.h"
+
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <sys/socket.h>
+
+/*
+ * Limits
+ */
+
+#define SIEVE_EXTPROGRAMS_MAX_PROGRAM_NAME_LEN 128
+#define SIEVE_EXTPROGRAMS_MAX_PROGRAM_ARG_LEN  1024
+
+#define SIEVE_EXTPROGRAMS_DEFAULT_EXEC_TIMEOUT_SECS 10
+#define SIEVE_EXTPROGRAMS_CONNECT_TIMEOUT_MSECS 5
+
+/*
+ * Pipe Extension Context
+ */
+
+struct sieve_extprograms_config *sieve_extprograms_config_init
+(const struct sieve_extension *ext)
+{
+	struct sieve_instance *svinst = ext->svinst;
+	struct sieve_extprograms_config *ext_config;
+	const char *extname = sieve_extension_name(ext);
+	const char *bin_dir, *socket_dir, *input_eol;
+	sieve_number_t execute_timeout;
+
+	extname = strrchr(extname, '.');
+	i_assert(extname != NULL);
+	extname++;
+
+	bin_dir = sieve_setting_get
+		(svinst, t_strdup_printf("sieve_%s_bin_dir", extname));
+	socket_dir = sieve_setting_get
+		(svinst, t_strdup_printf("sieve_%s_socket_dir", extname));
+	input_eol = sieve_setting_get
+		(svinst, t_strdup_printf("sieve_%s_input_eol", extname));
+	
+	ext_config = i_new(struct sieve_extprograms_config, 1);
+	ext_config->execute_timeout = 
+		SIEVE_EXTPROGRAMS_DEFAULT_EXEC_TIMEOUT_SECS;
+
+	if ( bin_dir == NULL && socket_dir == NULL ) {
+		e_debug(svinst->event, "%s extension: "
+			"no bin or socket directory specified; extension is unconfigured "
+			"(both sieve_%s_bin_dir and sieve_%s_socket_dir are not set)",
+			sieve_extension_name(ext), extname, extname);
+	} else {
+		ext_config->bin_dir = i_strdup(bin_dir);
+		ext_config->socket_dir = i_strdup(socket_dir);
+
+		if (sieve_setting_get_duration_value
+			(svinst, t_strdup_printf("sieve_%s_exec_timeout", extname),
+				&execute_timeout)) {
+			ext_config->execute_timeout = execute_timeout;
+		}
+
+		ext_config->default_input_eol = SIEVE_EXTPROGRAMS_EOL_CRLF;
+		if (input_eol != NULL && strcasecmp(input_eol, "lf") == 0)
+			ext_config->default_input_eol = SIEVE_EXTPROGRAMS_EOL_LF;
+	}
+
+	if ( sieve_extension_is(ext, sieve_ext_vnd_pipe) ) 
+		ext_config->copy_ext = sieve_ext_copy_get_extension(ext->svinst);
+	if ( sieve_extension_is(ext, sieve_ext_vnd_execute) ) 
+		ext_config->var_ext = sieve_ext_variables_get_extension(ext->svinst);
+	return ext_config;
+}
+
+void sieve_extprograms_config_deinit
+(struct sieve_extprograms_config **ext_config)
+{
+	if ( *ext_config == NULL )
+		return;
+
+	i_free((*ext_config)->bin_dir);
+	i_free((*ext_config)->socket_dir);
+	i_free((*ext_config));
+
+	*ext_config = NULL;
+}
+
+/*
+ * Program name and arguments
+ */
+
+bool sieve_extprogram_name_is_valid(string_t *name)
+{
+	ARRAY_TYPE(unichars) uni_name;
+	unsigned int count, i;
+	const unichar_t *name_chars;
+	size_t namelen = str_len(name);
+
+	/* Check minimum length */
+	if ( namelen == 0 )
+		return FALSE;
+
+	/* Check worst-case maximum length */
+	if ( namelen > SIEVE_EXTPROGRAMS_MAX_PROGRAM_NAME_LEN * 4 )
+		return FALSE;
+
+	/* Intialize array for unicode characters */
+	t_array_init(&uni_name, namelen * 4);
+
+	/* Convert UTF-8 to UCS4/UTF-32 */
+	if ( uni_utf8_to_ucs4_n(str_data(name), namelen, &uni_name) < 0 )
+		return FALSE;
+	name_chars = array_get(&uni_name, &count);
+
+	/* Check true maximum length */
+	if ( count > SIEVE_EXTPROGRAMS_MAX_PROGRAM_NAME_LEN )
+		return FALSE;
+
+	/* Scan name for invalid characters
+	 *   FIXME: compliance with Net-Unicode Definition (Section 2 of
+	 *          RFC 5198) is not checked fully and no normalization
+	 *          is performed.
+	 */
+	for ( i = 0; i < count; i++ ) {
+
+		/* 0000-001F; [CONTROL CHARACTERS] */
+		if ( name_chars[i] <= 0x001f )
+			return FALSE;
+
+		/* 002F; SLASH */
+		if ( name_chars[i] == 0x002f )
+			return FALSE;
+
+		/* 007F; DELETE */
+		if ( name_chars[i] == 0x007f )
+			return FALSE;
+
+		/* 0080-009F; [CONTROL CHARACTERS] */
+		if ( name_chars[i] >= 0x0080 && name_chars[i] <= 0x009f )
+			return FALSE;
+
+		/* 00FF */
+		if ( name_chars[i] == 0x00ff )
+			return FALSE;
+
+		/* 2028; LINE SEPARATOR */
+		/* 2029; PARAGRAPH SEPARATOR */
+		if ( name_chars[i] == 0x2028 || name_chars[i] == 0x2029 )
+			return FALSE;
+	}
+
+	return TRUE;
+}
+
+bool sieve_extprogram_arg_is_valid(string_t *arg)
+{
+	const unsigned char *chars;
+	unsigned int i;
+
+	/* Check maximum length */
+	if ( str_len(arg) > SIEVE_EXTPROGRAMS_MAX_PROGRAM_ARG_LEN )
+		return FALSE;
+
+	/* Check invalid characters */
+	chars = str_data(arg);
+	for ( i = 0; i < str_len(arg); i++ ) {
+		/* 0010; CR */
+		if ( chars[i] == 0x0D )
+			return FALSE;
+
+		/* 0010; LF */
+		if ( chars[i] == 0x0A )
+			return FALSE;
+	}
+
+	return TRUE;
+}
+
+/*
+ * Command validation
+ */
+
+struct _arg_validate_context {
+	struct sieve_validator *valdtr;
+	struct sieve_command *cmd;
+};
+
+static int _arg_validate
+(void *context, struct sieve_ast_argument *item)
+{
+	struct _arg_validate_context *actx = (struct _arg_validate_context *) context;
+
+	if ( sieve_argument_is_string_literal(item) ) {
+		string_t *arg = sieve_ast_argument_str(item);
+
+		if ( !sieve_extprogram_arg_is_valid(arg) ) {
+			sieve_argument_validate_error(actx->valdtr, item,
+				"%s %s: specified external program argument `%s' is invalid",
+				sieve_command_identifier(actx->cmd), sieve_command_type_name(actx->cmd),
+				str_sanitize(str_c(arg), 128));
+
+			return -1;
+		}
+	}
+
+	return 1;
+}
+
+bool sieve_extprogram_command_validate
+(struct sieve_validator *valdtr, struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg = cmd->first_positional;
+	struct sieve_ast_argument *stritem;
+	struct _arg_validate_context actx;
+	string_t *program_name;
+
+	if ( arg == NULL ) {
+		sieve_command_validate_error(valdtr, cmd, 
+			"the %s %s expects at least one positional argument, but none was found", 
+			sieve_command_identifier(cmd), sieve_command_type_name(cmd));
+		return FALSE;
+	}
+
+	/* <program-name: string> argument */
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, cmd, arg, "program-name", 1, SAAT_STRING) ) {
+		return FALSE;
+	}
+	
+	if ( !sieve_validator_argument_activate(valdtr, cmd, arg, FALSE) )
+		return FALSE;
+
+	/* Variables are not allowed */
+	if ( !sieve_argument_is_string_literal(arg) ) {
+		sieve_argument_validate_error(valdtr, arg, 
+			"the %s %s requires a constant string "
+			"for its program-name argument",
+			sieve_command_identifier(cmd), sieve_command_type_name(cmd));
+		return FALSE;
+	}
+
+	/* Check program name */
+	program_name = sieve_ast_argument_str(arg);
+	if ( !sieve_extprogram_name_is_valid(program_name) ) {
+ 		sieve_argument_validate_error(valdtr, arg,
+			"%s %s: invalid program name '%s'",
+			sieve_command_identifier(cmd), sieve_command_type_name(cmd),
+			str_sanitize(str_c(program_name), 80));
+		return FALSE;
+	}
+
+	/* Optional <arguments: string-list> argument */
+
+	arg = sieve_ast_argument_next(arg);
+	if ( arg == NULL )
+		return TRUE;
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, cmd, arg, "arguments", 2, SAAT_STRING_LIST) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, cmd, arg, FALSE) )
+		return FALSE;
+
+	/* Check arguments */
+	actx.valdtr = valdtr;
+	actx.cmd = cmd;
+	stritem = arg;
+	if ( sieve_ast_stringlist_map
+		(&stritem, (void *)&actx, _arg_validate) <= 0 ) {
+		return FALSE;
+	}
+
+	if ( sieve_ast_argument_next(arg) != NULL ) {
+		sieve_command_validate_error(valdtr, cmd, 
+			"the %s %s expects at most two positional arguments, but more were found", 
+			sieve_command_identifier(cmd), sieve_command_type_name(cmd));
+		return FALSE;
+	}
+
+	return TRUE;
+}
+
+/*
+ * Common command operands
+ */
+
+int sieve_extprogram_command_read_operands
+(const struct sieve_runtime_env *renv, sieve_size_t *address,
+	string_t **pname_r, struct sieve_stringlist **args_list_r)
+{	
+	string_t *arg;
+	int ret;
+
+	/*
+	 * Read fixed operands
+	 */
+
+	if ( (ret=sieve_opr_string_read
+		(renv, address, "program-name", pname_r)) <= 0 )
+		return ret;
+
+	if ( (ret=sieve_opr_stringlist_read_ex
+		(renv, address, "arguments", TRUE, args_list_r)) <= 0 )
+		return ret;
+		
+	/*
+	 * Check operands
+	 */
+
+	arg = NULL;
+	while ( *args_list_r != NULL &&
+		(ret=sieve_stringlist_next_item(*args_list_r, &arg)) > 0 ) {
+		if ( !sieve_extprogram_arg_is_valid(arg) ) {
+			sieve_runtime_error(renv, NULL,
+				"specified :args item `%s' is invalid",
+				str_sanitize(str_c(arg), 128));
+			return SIEVE_EXEC_FAILURE;
+		}
+	}
+
+	if ( ret < 0 ) {
+		sieve_runtime_trace_error(renv, "invalid args-list item");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Running external programs
+ */
+
+struct sieve_extprogram {
+	struct sieve_instance *svinst;
+	const struct sieve_extprograms_config *ext_config;
+
+	const struct sieve_script_env *scriptenv;
+	struct program_client_settings set;
+	struct program_client *program_client;
+};
+
+void sieve_extprogram_exec_error
+(struct sieve_error_handler *ehandler, const char *location,
+	const char *fmt, ...)
+{
+	char str[256];
+	struct tm *tm;
+	const char *timestamp;
+
+	tm = localtime(&ioloop_time);
+
+	timestamp =
+		( strftime(str, sizeof(str), " [%Y-%m-%d %H:%M:%S]", tm) > 0 ? str : "" );
+
+	va_list args;
+	va_start(args, fmt);
+
+	T_BEGIN {
+		sieve_error(ehandler, location,
+			"%s: refer to server log for more information.%s",
+			t_strdup_vprintf(fmt, args), timestamp);
+	} T_END;
+
+	va_end(args);
+}
+
+/* API */
+
+struct sieve_extprogram *sieve_extprogram_create
+(const struct sieve_extension *ext, const struct sieve_script_env *senv,
+	const struct sieve_message_data *msgdata, const char *action,
+	const char *program_name, const char * const *args,
+	enum sieve_error *error_r)
+{
+	struct sieve_instance *svinst = ext->svinst;
+	struct sieve_extprograms_config *ext_config =
+		(struct sieve_extprograms_config *) ext->context;
+	const struct smtp_address *sender, *recipient, *orig_recipient;
+	struct sieve_extprogram *sprog;
+	const char *path = NULL;
+	struct stat st;
+	bool fork = FALSE;
+
+	e_debug(svinst->event, "action %s: "
+		"running program: %s", action, program_name);
+
+	if ( ext_config == NULL ||
+		(ext_config->bin_dir == NULL && ext_config->socket_dir == NULL) ) {
+		e_error(svinst->event, "action %s: "
+			"failed to execute program `%s': "
+			"vnd.dovecot.%s extension is unconfigured",
+			action, program_name, action);
+		*error_r = SIEVE_ERROR_NOT_FOUND;
+		return NULL;
+	}
+
+	/* Try socket first */
+	if ( ext_config->socket_dir != NULL ) {
+		path = t_strconcat(senv->user->set->base_dir, "/",
+			ext_config->socket_dir, "/", program_name, NULL);
+		if ( stat(path, &st) < 0 ) {
+			switch ( errno ) {
+			case ENOENT:
+				e_debug(svinst->event, "action %s: "
+					"socket path `%s' for program `%s' not found",
+					action, path, program_name);
+				break;
+			case EACCES:
+				e_error(svinst->event, "action %s: "
+					"failed to stat socket: %s",
+					action, eacces_error_get("stat", path));
+				*error_r = SIEVE_ERROR_NO_PERMISSION;
+				return NULL;
+			default:
+				e_error(svinst->event, "action %s: "
+					"failed to stat socket `%s': %m",
+					action, path);
+				*error_r = SIEVE_ERROR_TEMP_FAILURE;
+				return NULL;
+			}
+			path = NULL;
+		} else if ( !S_ISSOCK(st.st_mode) ) {
+			e_error(svinst->event, "action %s: "
+				"socket path `%s' for program `%s' is not a socket",
+				action, path, program_name);
+			*error_r = SIEVE_ERROR_NOT_POSSIBLE;
+			return NULL;
+		}
+	}
+		
+	/* Try executable next */
+	if ( path == NULL && ext_config->bin_dir != NULL ) {
+		fork = TRUE;
+		path = t_strconcat(ext_config->bin_dir, "/", program_name, NULL);
+		if ( stat(path, &st) < 0 ) {
+			switch ( errno ) {
+			case ENOENT:
+				e_debug(svinst->event, "action %s: "
+					"executable path `%s' for program `%s' not found",
+					action, path, program_name);
+				*error_r = SIEVE_ERROR_NOT_FOUND;
+				break;
+			case EACCES:
+				e_error(svinst->event, "action %s: "
+					"failed to stat program: %s",
+					action, eacces_error_get("stat", path));
+				*error_r = SIEVE_ERROR_NO_PERMISSION;
+				break;
+			default:
+				e_error(svinst->event, "action %s: "
+					"failed to stat program `%s': %m",
+					action, path);
+				*error_r = SIEVE_ERROR_TEMP_FAILURE;
+				break;
+			}
+
+			return NULL;
+		} else if ( !S_ISREG(st.st_mode) ) {
+			e_error(svinst->event, "action %s: "
+				"executable `%s' for program `%s' is not a regular file",
+				action, path, program_name);
+			*error_r = SIEVE_ERROR_NOT_POSSIBLE;
+			return NULL;
+		} else if ( (st.st_mode & S_IWOTH) != 0 ) {
+			e_error(svinst->event, "action %s: "
+				"executable `%s' for program `%s' is world-writable",
+				action, path, program_name);
+			*error_r = SIEVE_ERROR_NO_PERMISSION;
+			return NULL;
+		}
+	}
+
+	/* None found ? */
+	if ( path == NULL ) {
+		e_error(svinst->event, "action %s: "
+			"program `%s' not found", action, program_name);
+		*error_r = SIEVE_ERROR_NOT_FOUND;
+		return NULL;
+	}
+
+	sprog = i_new(struct sieve_extprogram, 1);
+	sprog->svinst = ext->svinst;
+	sprog->ext_config = ext_config;
+	sprog->scriptenv = senv;
+
+	sprog->set.client_connect_timeout_msecs =
+		SIEVE_EXTPROGRAMS_CONNECT_TIMEOUT_MSECS;
+	sprog->set.input_idle_timeout_msecs =
+		ext_config->execute_timeout * 1000;
+	restrict_access_init(&sprog->set.restrict_set);
+	if (senv->user->uid != 0)
+		sprog->set.restrict_set.uid = senv->user->uid;
+	if (senv->user->gid != 0)
+		sprog->set.restrict_set.gid = senv->user->gid;
+	sprog->set.debug = svinst->debug;
+
+	if ( fork ) {
+		sprog->program_client =
+			program_client_local_create(path, args, &sprog->set);
+	} else {
+		sprog->program_client =
+			program_client_unix_create(path, args, &sprog->set, FALSE);
+	}
+
+	if ( svinst->username != NULL )
+		program_client_set_env(sprog->program_client, "USER", svinst->username);
+	if ( svinst->home_dir != NULL )
+		program_client_set_env(sprog->program_client, "HOME", svinst->home_dir);
+	if ( svinst->hostname != NULL )
+		program_client_set_env(sprog->program_client, "HOST", svinst->hostname);
+
+	sender = msgdata->envelope.mail_from;
+	recipient = msgdata->envelope.rcpt_to;
+	orig_recipient = NULL;
+	if ( msgdata->envelope.rcpt_params != NULL )
+		orig_recipient = msgdata->envelope.rcpt_params->orcpt.addr;
+
+	if ( !smtp_address_isnull(sender) ) {
+		program_client_set_env(sprog->program_client, "SENDER",
+				       smtp_address_encode(sender));
+	}
+	if ( !smtp_address_isnull(recipient) ) {
+		program_client_set_env(sprog->program_client, "RECIPIENT",
+				       smtp_address_encode(recipient));
+	}
+	if ( !smtp_address_isnull(orig_recipient) ) {
+		program_client_set_env(sprog->program_client, "ORIG_RECIPIENT",
+				       smtp_address_encode(orig_recipient));
+	}
+
+	return sprog;
+}
+
+void sieve_extprogram_destroy(struct sieve_extprogram **_sprog)
+{
+	struct sieve_extprogram *sprog = *_sprog;
+
+	program_client_destroy(&sprog->program_client);
+	i_free(sprog);
+	*_sprog = NULL;
+}
+
+/* I/0 */
+
+void sieve_extprogram_set_output
+(struct sieve_extprogram *sprog, struct ostream *output)
+{
+	program_client_set_output(sprog->program_client, output);
+}
+
+void sieve_extprogram_set_input
+(struct sieve_extprogram *sprog, struct istream *input)
+{
+	switch (sprog->ext_config->default_input_eol) {
+	case SIEVE_EXTPROGRAMS_EOL_LF:
+		input = i_stream_create_lf(input);
+		break;
+	case SIEVE_EXTPROGRAMS_EOL_CRLF:
+		input = i_stream_create_crlf(input);
+		break;
+	default:
+		i_unreached();
+	}
+
+	program_client_set_input(sprog->program_client, input);
+
+	i_stream_unref(&input);
+}
+
+void sieve_extprogram_set_output_seekable
+(struct sieve_extprogram *sprog)
+{
+	string_t *prefix;
+	prefix = t_str_new(128);
+	mail_user_set_get_temp_prefix(prefix, sprog->scriptenv->user->set);
+
+	program_client_set_output_seekable(sprog->program_client, str_c(prefix));
+}
+
+struct istream *sieve_extprogram_get_output_seekable
+(struct sieve_extprogram *sprog)
+{
+	return program_client_get_output_seekable(sprog->program_client);
+}
+
+int sieve_extprogram_set_input_mail
+(struct sieve_extprogram *sprog, struct mail *mail)
+{
+	struct istream *input;
+
+	if (mail_get_stream(mail, NULL, NULL, &input) < 0)
+		return -1;
+
+	sieve_extprogram_set_input(sprog, input);
+	return 1;
+}
+
+int sieve_extprogram_run(struct sieve_extprogram *sprog)
+{
+	switch (program_client_run(sprog->program_client)) {
+	case PROGRAM_CLIENT_EXIT_STATUS_INTERNAL_FAILURE:
+		return -1;
+	case PROGRAM_CLIENT_EXIT_STATUS_FAILURE:
+		return 0;
+	case PROGRAM_CLIENT_EXIT_STATUS_SUCCESS:
+		return 1;
+	}
+	i_unreached();
+}
+
diff --git a/pigeonhole/src/plugins/sieve-extprograms/sieve-extprograms-common.h b/pigeonhole/src/plugins/sieve-extprograms/sieve-extprograms-common.h
new file mode 100644
index 0000000..063c02b
--- /dev/null
+++ b/pigeonhole/src/plugins/sieve-extprograms/sieve-extprograms-common.h
@@ -0,0 +1,107 @@
+#ifndef SIEVE_EXTPROGRAMS_COMMON_H
+#define SIEVE_EXTPROGRAMS_COMMON_H
+
+#include "sieve-common.h"
+
+/*
+ * Extension configuration
+ */
+
+enum sieve_extprograms_eol {
+	SIEVE_EXTPROGRAMS_EOL_CRLF = 0,
+	SIEVE_EXTPROGRAMS_EOL_LF
+};
+
+struct sieve_extprograms_config {
+	const struct sieve_extension *copy_ext;
+	const struct sieve_extension *var_ext;
+
+	char *socket_dir;
+	char *bin_dir;
+
+	enum sieve_extprograms_eol default_input_eol;
+
+	unsigned int execute_timeout;
+};
+
+struct sieve_extprograms_config *sieve_extprograms_config_init
+	(const struct sieve_extension *ext);
+void sieve_extprograms_config_deinit
+	(struct sieve_extprograms_config **ext_config);
+
+/*
+ * Extensions
+ */
+
+extern const struct sieve_extension_def sieve_ext_vnd_pipe;
+extern const struct sieve_extension_def sieve_ext_vnd_filter;
+extern const struct sieve_extension_def sieve_ext_vnd_execute;
+
+/* 
+ * Commands 
+ */
+
+extern const struct sieve_command_def sieve_cmd_pipe;
+extern const struct sieve_command_def sieve_cmd_filter;
+extern const struct sieve_command_def sieve_cmd_execute;
+
+/*
+ * Operations
+ */
+
+extern const struct sieve_operation_def sieve_opr_pipe;
+extern const struct sieve_operation_def sieve_opr_filter;
+extern const struct sieve_operation_def sieve_opr_execute;
+
+/*
+ * Program name and arguments
+ */
+
+bool sieve_extprogram_arg_is_valid(string_t *arg);
+bool sieve_extprogram_name_is_valid(string_t *name);
+
+/*
+ * Command validation
+ */
+
+bool sieve_extprogram_command_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+
+/*
+ * Common command operands
+ */
+
+int sieve_extprogram_command_read_operands
+	(const struct sieve_runtime_env *renv, sieve_size_t *address,
+		string_t **pname_r, struct sieve_stringlist **args_list_r);
+
+/*
+ * Running external programs
+ */
+
+void sieve_extprogram_exec_error
+	(struct sieve_error_handler *ehandler, const char *location,
+		const char *fmt, ...) ATTR_FORMAT(3, 4);
+
+struct sieve_extprogram *sieve_extprogram_create
+	(const struct sieve_extension *ext, const struct sieve_script_env *senv,
+		const struct sieve_message_data *msgdata, const char *action,
+		const char *program_name, const char * const *args,
+		enum sieve_error *error_r);
+void sieve_extprogram_destroy(struct sieve_extprogram **_sprog);
+
+void sieve_extprogram_set_output
+	(struct sieve_extprogram *sprog, struct ostream *output);
+void sieve_extprogram_set_output_seekable
+	(struct sieve_extprogram *sprog);
+struct istream *sieve_extprogram_get_output_seekable
+	(struct sieve_extprogram *sprog);
+
+void sieve_extprogram_set_input
+	(struct sieve_extprogram *sprog, struct istream *input);
+int sieve_extprogram_set_input_mail
+	(struct sieve_extprogram *sprog, struct mail *mail);
+
+int sieve_extprogram_run(struct sieve_extprogram *sprog);
+
+#endif
diff --git a/pigeonhole/src/plugins/sieve-extprograms/sieve-extprograms-plugin.c b/pigeonhole/src/plugins/sieve-extprograms/sieve-extprograms-plugin.c
new file mode 100644
index 0000000..bf17a80
--- /dev/null
+++ b/pigeonhole/src/plugins/sieve-extprograms/sieve-extprograms-plugin.c
@@ -0,0 +1,68 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+#include "sieve-extensions.h"
+
+#include "sieve-extprograms-common.h"
+#include "sieve-extprograms-plugin.h"
+
+/*
+ * Sieve plugin interface
+ */
+
+struct _plugin_context {
+	const struct sieve_extension *ext_pipe;
+	const struct sieve_extension *ext_filter;
+	const struct sieve_extension *ext_execute;		
+};
+
+const char *sieve_extprograms_plugin_version = PIGEONHOLE_ABI_VERSION;
+
+void sieve_extprograms_plugin_load
+(struct sieve_instance *svinst, void **context)
+{
+	struct _plugin_context *pctx = i_new(struct _plugin_context, 1);
+
+	pctx->ext_pipe = sieve_extension_register
+		(svinst, &sieve_ext_vnd_pipe, FALSE);
+	pctx->ext_filter = sieve_extension_register
+		(svinst, &sieve_ext_vnd_filter, FALSE);
+	pctx->ext_execute = sieve_extension_register
+		(svinst, &sieve_ext_vnd_execute, FALSE);
+
+	if ( svinst->debug ) {
+		e_debug(svinst->event,
+			"Sieve Extprograms plugin for %s version %s loaded",
+			PIGEONHOLE_NAME, PIGEONHOLE_VERSION_FULL);
+	}
+
+	*context = (void *)pctx;
+}
+
+void sieve_extprograms_plugin_unload
+(struct sieve_instance *svinst ATTR_UNUSED, void *context)
+{
+	struct _plugin_context *pctx = (struct _plugin_context *)context;
+
+	sieve_extension_unregister(pctx->ext_pipe);
+	sieve_extension_unregister(pctx->ext_filter);
+	sieve_extension_unregister(pctx->ext_execute);
+
+	i_free(pctx);
+}
+
+/*
+ * Module interface
+ */
+
+void sieve_extprograms_plugin_init(void)
+{
+	/* Nothing */
+}
+
+void sieve_extprograms_plugin_deinit(void)
+{
+	/* Nothing */
+}
diff --git a/pigeonhole/src/plugins/sieve-extprograms/sieve-extprograms-plugin.h b/pigeonhole/src/plugins/sieve-extprograms/sieve-extprograms-plugin.h
new file mode 100644
index 0000000..20fa55a
--- /dev/null
+++ b/pigeonhole/src/plugins/sieve-extprograms/sieve-extprograms-plugin.h
@@ -0,0 +1,20 @@
+#ifndef SIEVE_EXTPROGRAMS_PLUGIN_H
+#define SIEVE_EXTPROGRAMS_PLUGIN_H
+
+/*
+ * Plugin interface
+ */
+
+void sieve_extprograms_plugin_load
+	(struct sieve_instance *svinst, void **context);
+void sieve_extprograms_plugin_unload
+	(struct sieve_instance *svinst, void *context);
+
+/*
+ * Module interface
+ */
+
+void sieve_extprograms_plugin_init(void);
+void sieve_extprograms_plugin_deinit(void);
+
+#endif
diff --git a/pigeonhole/src/sieve-tools/Makefile.am b/pigeonhole/src/sieve-tools/Makefile.am
new file mode 100644
index 0000000..f2ceffd
--- /dev/null
+++ b/pigeonhole/src/sieve-tools/Makefile.am
@@ -0,0 +1,59 @@
+bin_PROGRAMS = sievec sieve-dump sieve-test sieve-filter
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib-sieve \
+	-I$(top_srcdir)/src/lib-sieve-tool \
+	-I$(srcdir)/debug \
+	$(LIBDOVECOT_INCLUDE) \
+	$(LIBDOVECOT_SERVICE_INCLUDE)
+
+libs = \
+	$(top_builddir)/src/lib-sieve/libdovecot-sieve.la \
+	$(top_builddir)/src/lib-sieve-tool/libsieve-tool.la
+
+libs_ldadd = $(libs) $(LIBDOVECOT_STORAGE) $(LIBDOVECOT_LDA) $(LIBDOVECOT)
+libs_deps = $(libs) $(LIBDOVECOT_STORAGE_DEPS) $(LIBDOVECOT_LDA_DEPS) $(LIBDOVECOT_DEPS)
+
+# Sieve Compile Tool
+
+sievec_CPPFLAGS = $(AM_CPPFLAGS) $(BINARY_CFLAGS)
+sievec_LDFLAGS = -export-dynamic $(BINARY_LDFLAGS)
+sievec_LDADD = $(libs_ldadd)
+sievec_DEPENDENCIES = $(libs_deps)
+
+sievec_SOURCES = \
+	sievec.c
+
+# Sieve Dump Tool
+
+sieve_dump_CPPFLAGS = $(AM_CPPFLAGS) $(BINARY_CFLAGS)
+sieve_dump_LDFLAGS = -export-dynamic $(BINARY_LDFLAGS)
+sieve_dump_LDADD = $(libs_ldadd)
+sieve_dump_DEPENDENCIES = $(libs_deps)
+
+sieve_dump_SOURCES = \
+	sieve-dump.c
+
+# Sieve Test Tool
+
+sieve_test_CPPFLAGS = $(AM_CPPFLAGS) $(BINARY_CFLAGS)
+sieve_test_LDFLAGS = -export-dynamic $(BINARY_LDFLAGS)
+sieve_test_LDADD = $(libs_ldadd)
+sieve_test_DEPENDENCIES = $(libs_deps)
+
+sieve_test_SOURCES = \
+	sieve-test.c
+
+## Unfinished tools
+
+# Sieve Filter Tool
+
+sieve_filter_CPPFLAGS = $(AM_CPPFLAGS) $(BINARY_CFLAGS)
+sieve_filter_LDFLAGS = -export-dynamic $(BINARY_LDFLAGS)
+sieve_filter_LDADD = $(libs_ldadd)
+sieve_filter_DEPENDENCIES = $(libs_deps)
+
+sieve_filter_SOURCES = \
+	sieve-filter.c
+
+noinst_HEADERS =
diff --git a/pigeonhole/src/sieve-tools/Makefile.in b/pigeonhole/src/sieve-tools/Makefile.in
new file mode 100644
index 0000000..6b5b0d0
--- /dev/null
+++ b/pigeonhole/src/sieve-tools/Makefile.in
@@ -0,0 +1,863 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+VPATH = @srcdir@
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+DISTCHECK_CONFIGURE_FLAGS = @DISTCHECK_CONFIGURE_FLAGS@
+DLLTOOL = @DLLTOOL@
+DOVECOT_BINARY_CFLAGS = @DOVECOT_BINARY_CFLAGS@
+DOVECOT_BINARY_LDFLAGS = @DOVECOT_BINARY_LDFLAGS@
+DOVECOT_CFLAGS = @DOVECOT_CFLAGS@
+DOVECOT_COMPRESS_LIBS = @DOVECOT_COMPRESS_LIBS@
+DOVECOT_INSTALLED = @DOVECOT_INSTALLED@
+DOVECOT_LIBS = @DOVECOT_LIBS@
+DOVECOT_LUA_CFLAGS = @DOVECOT_LUA_CFLAGS@
+DOVECOT_LUA_LIBS = @DOVECOT_LUA_LIBS@
+DOVECOT_SQL_LIBS = @DOVECOT_SQL_LIBS@
+DOVECOT_SSL_LIBS = @DOVECOT_SSL_LIBS@
+DSYMUTIL = @DSYMUTIL@
+DUMPBIN = @DUMPBIN@
+ECHO_C = @ECHO_C@
+ECHO_N = @ECHO_N@
+ECHO_T = @ECHO_T@
+EGREP = @EGREP@
+EXEEXT = @EXEEXT@
+FGREP = @FGREP@
+GREP = @GREP@
+INSTALL = @INSTALL@
+INSTALL_DATA = @INSTALL_DATA@
+INSTALL_PROGRAM = @INSTALL_PROGRAM@
+INSTALL_SCRIPT = @INSTALL_SCRIPT@
+INSTALL_STRIP_PROGRAM = @INSTALL_STRIP_PROGRAM@
+LD = @LD@
+LDAP_LIBS = @LDAP_LIBS@
+LDFLAGS = @LDFLAGS@
+LIBDOVECOT = @LIBDOVECOT@
+LIBDOVECOT_ACL_INCLUDE = @LIBDOVECOT_ACL_INCLUDE@
+LIBDOVECOT_AUTH_INCLUDE = @LIBDOVECOT_AUTH_INCLUDE@
+LIBDOVECOT_COMPRESS = @LIBDOVECOT_COMPRESS@
+LIBDOVECOT_COMPRESS_DEPS = @LIBDOVECOT_COMPRESS_DEPS@
+LIBDOVECOT_CONFIG_INCLUDE = @LIBDOVECOT_CONFIG_INCLUDE@
+LIBDOVECOT_DEPS = @LIBDOVECOT_DEPS@
+LIBDOVECOT_DOVEADM_INCLUDE = @LIBDOVECOT_DOVEADM_INCLUDE@
+LIBDOVECOT_DSYNC = @LIBDOVECOT_DSYNC@
+LIBDOVECOT_DSYNC_DEPS = @LIBDOVECOT_DSYNC_DEPS@
+LIBDOVECOT_DSYNC_INCLUDE = @LIBDOVECOT_DSYNC_INCLUDE@
+LIBDOVECOT_FTS_INCLUDE = @LIBDOVECOT_FTS_INCLUDE@
+LIBDOVECOT_IMAPC_INCLUDE = @LIBDOVECOT_IMAPC_INCLUDE@
+LIBDOVECOT_IMAP_INCLUDE = @LIBDOVECOT_IMAP_INCLUDE@
+LIBDOVECOT_IMAP_LOGIN_INCLUDE = @LIBDOVECOT_IMAP_LOGIN_INCLUDE@
+LIBDOVECOT_INCLUDE = @LIBDOVECOT_INCLUDE@
+LIBDOVECOT_LDA = @LIBDOVECOT_LDA@
+LIBDOVECOT_LDA_DEPS = @LIBDOVECOT_LDA_DEPS@
+LIBDOVECOT_LDA_INCLUDE = @LIBDOVECOT_LDA_INCLUDE@
+LIBDOVECOT_LIBFTS = @LIBDOVECOT_LIBFTS@
+LIBDOVECOT_LIBFTS_DEPS = @LIBDOVECOT_LIBFTS_DEPS@
+LIBDOVECOT_LIBFTS_INCLUDE = @LIBDOVECOT_LIBFTS_INCLUDE@
+LIBDOVECOT_LMTP_INCLUDE = @LIBDOVECOT_LMTP_INCLUDE@
+LIBDOVECOT_LOGIN = @LIBDOVECOT_LOGIN@
+LIBDOVECOT_LOGIN_DEPS = @LIBDOVECOT_LOGIN_DEPS@
+LIBDOVECOT_LOGIN_INCLUDE = @LIBDOVECOT_LOGIN_INCLUDE@
+LIBDOVECOT_LUA = @LIBDOVECOT_LUA@
+LIBDOVECOT_LUA_DEPS = @LIBDOVECOT_LUA_DEPS@
+LIBDOVECOT_LUA_INCLUDE = @LIBDOVECOT_LUA_INCLUDE@
+LIBDOVECOT_NOTIFY_INCLUDE = @LIBDOVECOT_NOTIFY_INCLUDE@
+LIBDOVECOT_POP3_INCLUDE = @LIBDOVECOT_POP3_INCLUDE@
+LIBDOVECOT_PUSH_NOTIFICATION_INCLUDE = @LIBDOVECOT_PUSH_NOTIFICATION_INCLUDE@
+LIBDOVECOT_SERVICE_INCLUDE = @LIBDOVECOT_SERVICE_INCLUDE@
+LIBDOVECOT_SQL = @LIBDOVECOT_SQL@
+LIBDOVECOT_SQL_DEPS = @LIBDOVECOT_SQL_DEPS@
+LIBDOVECOT_SQL_INCLUDE = @LIBDOVECOT_SQL_INCLUDE@
+LIBDOVECOT_SSL = @LIBDOVECOT_SSL@
+LIBDOVECOT_SSL_DEPS = @LIBDOVECOT_SSL_DEPS@
+LIBDOVECOT_STORAGE = @LIBDOVECOT_STORAGE@
+LIBDOVECOT_STORAGE_DEPS = @LIBDOVECOT_STORAGE_DEPS@
+LIBDOVECOT_STORAGE_INCLUDE = @LIBDOVECOT_STORAGE_INCLUDE@
+LIBDOVECOT_SUBMISSION_INCLUDE = @LIBDOVECOT_SUBMISSION_INCLUDE@
+LIBOBJS = @LIBOBJS@
+LIBS = @LIBS@
+LIBTOOL = @LIBTOOL@
+LIPO = @LIPO@
+LN_S = @LN_S@
+LTLIBOBJS = @LTLIBOBJS@
+LT_SYS_LIBRARY_PATH = @LT_SYS_LIBRARY_PATH@
+MAINT = @MAINT@
+MAKEINFO = @MAKEINFO@
+MANIFEST_TOOL = @MANIFEST_TOOL@
+MKDIR_P = @MKDIR_P@
+NM = @NM@
+NMEDIT = @NMEDIT@
+OBJDUMP = @OBJDUMP@
+OBJEXT = @OBJEXT@
+OTOOL = @OTOOL@
+OTOOL64 = @OTOOL64@
+PACKAGE = @PACKAGE@
+PACKAGE_BUGREPORT = @PACKAGE_BUGREPORT@
+PACKAGE_NAME = @PACKAGE_NAME@
+PACKAGE_STRING = @PACKAGE_STRING@
+PACKAGE_TARNAME = @PACKAGE_TARNAME@
+PACKAGE_URL = @PACKAGE_URL@
+PACKAGE_VERSION = @PACKAGE_VERSION@
+PATH_SEPARATOR = @PATH_SEPARATOR@
+PIE_CFLAGS = @PIE_CFLAGS@
+PIE_LDFLAGS = @PIE_LDFLAGS@
+RANLIB = @RANLIB@
+RELRO_LDFLAGS = @RELRO_LDFLAGS@
+RUN_TEST = @RUN_TEST@
+SED = @SED@
+SET_MAKE = @SET_MAKE@
+SHELL = @SHELL@
+STRIP = @STRIP@
+VALGRIND = @VALGRIND@
+VERSION = @VERSION@
+abs_builddir = @abs_builddir@
+abs_srcdir = @abs_srcdir@
+abs_top_builddir = @abs_top_builddir@
+abs_top_srcdir = @abs_top_srcdir@
+ac_ct_AR = @ac_ct_AR@
+ac_ct_CC = @ac_ct_CC@
+ac_ct_DUMPBIN = @ac_ct_DUMPBIN@
+am__include = @am__include@
+am__leading_dot = @am__leading_dot@
+am__quote = @am__quote@
+am__tar = @am__tar@
+am__untar = @am__untar@
+bindir = @bindir@
+build = @build@
+build_alias = @build_alias@
+build_cpu = @build_cpu@
+build_os = @build_os@
+build_vendor = @build_vendor@
+builddir = @builddir@
+datadir = @datadir@
+datarootdir = @datarootdir@
+docdir = @docdir@
+dovecot_docdir = @dovecot_docdir@
+dovecot_installed_moduledir = @dovecot_installed_moduledir@
+dovecot_moduledir = @dovecot_moduledir@
+dovecot_pkgincludedir = @dovecot_pkgincludedir@
+dovecot_pkglibdir = @dovecot_pkglibdir@
+dovecot_pkglibexecdir = @dovecot_pkglibexecdir@
+dovecot_statedir = @dovecot_statedir@
+dovecotdir = @dovecotdir@
+dvidir = @dvidir@
+exec_prefix = @exec_prefix@
+host = @host@
+host_alias = @host_alias@
+host_cpu = @host_cpu@
+host_os = @host_os@
+host_vendor = @host_vendor@
+htmldir = @htmldir@
+includedir = @includedir@
+infodir = @infodir@
+install_sh = @install_sh@
+libdir = @libdir@
+libexecdir = @libexecdir@
+localedir = @localedir@
+localstatedir = @localstatedir@
+mandir = @mandir@
+mkdir_p = @mkdir_p@
+moduledir = @moduledir@
+oldincludedir = @oldincludedir@
+pdfdir = @pdfdir@
+prefix = @prefix@
+program_transform_name = @program_transform_name@
+psdir = @psdir@
+runstatedir = @runstatedir@
+sbindir = @sbindir@
+sharedstatedir = @sharedstatedir@
+sieve_docdir = @sieve_docdir@
+srcdir = @srcdir@
+sysconfdir = @sysconfdir@
+target_alias = @target_alias@
+top_build_prefix = @top_build_prefix@
+top_builddir = @top_builddir@
+top_srcdir = @top_srcdir@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib-sieve \
+	-I$(top_srcdir)/src/lib-sieve-tool \
+	-I$(srcdir)/debug \
+	$(LIBDOVECOT_INCLUDE) \
+	$(LIBDOVECOT_SERVICE_INCLUDE)
+
+libs = \
+	$(top_builddir)/src/lib-sieve/libdovecot-sieve.la \
+	$(top_builddir)/src/lib-sieve-tool/libsieve-tool.la
+
+libs_ldadd = $(libs) $(LIBDOVECOT_STORAGE) $(LIBDOVECOT_LDA) $(LIBDOVECOT)
+libs_deps = $(libs) $(LIBDOVECOT_STORAGE_DEPS) $(LIBDOVECOT_LDA_DEPS) $(LIBDOVECOT_DEPS)
+
+# Sieve Compile Tool
+sievec_CPPFLAGS = $(AM_CPPFLAGS) $(BINARY_CFLAGS)
+sievec_LDFLAGS = -export-dynamic $(BINARY_LDFLAGS)
+sievec_LDADD = $(libs_ldadd)
+sievec_DEPENDENCIES = $(libs_deps)
+sievec_SOURCES = \
+	sievec.c
+
+
+# Sieve Dump Tool
+sieve_dump_CPPFLAGS = $(AM_CPPFLAGS) $(BINARY_CFLAGS)
+sieve_dump_LDFLAGS = -export-dynamic $(BINARY_LDFLAGS)
+sieve_dump_LDADD = $(libs_ldadd)
+sieve_dump_DEPENDENCIES = $(libs_deps)
+sieve_dump_SOURCES = \
+	sieve-dump.c
+
+
+# Sieve Test Tool
+sieve_test_CPPFLAGS = $(AM_CPPFLAGS) $(BINARY_CFLAGS)
+sieve_test_LDFLAGS = -export-dynamic $(BINARY_LDFLAGS)
+sieve_test_LDADD = $(libs_ldadd)
+sieve_test_DEPENDENCIES = $(libs_deps)
+sieve_test_SOURCES = \
+	sieve-test.c
+
+
+# Sieve Filter Tool
+sieve_filter_CPPFLAGS = $(AM_CPPFLAGS) $(BINARY_CFLAGS)
+sieve_filter_LDFLAGS = -export-dynamic $(BINARY_LDFLAGS)
+sieve_filter_LDADD = $(libs_ldadd)
+sieve_filter_DEPENDENCIES = $(libs_deps)
+sieve_filter_SOURCES = \
+	sieve-filter.c
+
+noinst_HEADERS = 
+all: all-am
+
+.SUFFIXES:
+.SUFFIXES: .c .lo .o .obj
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/sieve-tools/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/sieve-tools/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4): @MAINTAINER_MODE_TRUE@ $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+install-binPROGRAMS: $(bin_PROGRAMS)
+	@$(NORMAL_INSTALL)
+	@list='$(bin_PROGRAMS)'; test -n "$(bindir)" || list=; \
+	if test -n "$$list"; then \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(bindir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(bindir)" || exit 1; \
+	fi; \
+	for p in $$list; do echo "$$p $$p"; done | \
+	sed 's/$(EXEEXT)$$//' | \
+	while read p p1; do if test -f $$p \
+	 || test -f $$p1 \
+	  ; then echo "$$p"; echo "$$p"; else :; fi; \
+	done | \
+	sed -e 'p;s,.*/,,;n;h' \
+	    -e 's|.*|.|' \
+	    -e 'p;x;s,.*/,,;s/$(EXEEXT)$$//;$(transform);s/$$/$(EXEEXT)/' | \
+	sed 'N;N;N;s,\n, ,g' | \
+	$(AWK) 'BEGIN { files["."] = ""; dirs["."] = 1 } \
+	  { d=$$3; if (dirs[d] != 1) { print "d", d; dirs[d] = 1 } \
+	    if ($$2 == $$4) files[d] = files[d] " " $$1; \
+	    else { print "f", $$3 "/" $$4, $$1; } } \
+	  END { for (d in files) print "f", d, files[d] }' | \
+	while read type dir files; do \
+	    if test "$$dir" = .; then dir=; else dir=/$$dir; fi; \
+	    test -z "$$files" || { \
+	    echo " $(INSTALL_PROGRAM_ENV) $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL_PROGRAM) $$files '$(DESTDIR)$(bindir)$$dir'"; \
+	    $(INSTALL_PROGRAM_ENV) $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL_PROGRAM) $$files "$(DESTDIR)$(bindir)$$dir" || exit $$?; \
+	    } \
+	; done
+
+uninstall-binPROGRAMS:
+	@$(NORMAL_UNINSTALL)
+	@list='$(bin_PROGRAMS)'; test -n "$(bindir)" || list=; \
+	files=`for p in $$list; do echo "$$p"; done | \
+	  sed -e 'h;s,^.*/,,;s/$(EXEEXT)$$//;$(transform)' \
+	      -e 's/$$/$(EXEEXT)/' \
+	`; \
+	test -n "$$list" || exit 0; \
+	echo " ( cd '$(DESTDIR)$(bindir)' && rm -f" $$files ")"; \
+	cd "$(DESTDIR)$(bindir)" && rm -f $$files
+
+clean-binPROGRAMS:
+	@list='$(bin_PROGRAMS)'; test -n "$$list" || exit 0; \
+	echo " rm -f" $$list; \
+	rm -f $$list || exit $$?; \
+	test -n "$(EXEEXT)" || exit 0; \
+	list=`for p in $$list; do echo "$$p"; done | sed 's/$(EXEEXT)$$//'`; \
+	echo " rm -f" $$list; \
+	rm -f $$list
+
+sieve-dump$(EXEEXT): $(sieve_dump_OBJECTS) $(sieve_dump_DEPENDENCIES) $(EXTRA_sieve_dump_DEPENDENCIES) 
+	@rm -f sieve-dump$(EXEEXT)
+	$(AM_V_CCLD)$(sieve_dump_LINK) $(sieve_dump_OBJECTS) $(sieve_dump_LDADD) $(LIBS)
+
+sieve-filter$(EXEEXT): $(sieve_filter_OBJECTS) $(sieve_filter_DEPENDENCIES) $(EXTRA_sieve_filter_DEPENDENCIES) 
+	@rm -f sieve-filter$(EXEEXT)
+	$(AM_V_CCLD)$(sieve_filter_LINK) $(sieve_filter_OBJECTS) $(sieve_filter_LDADD) $(LIBS)
+
+sieve-test$(EXEEXT): $(sieve_test_OBJECTS) $(sieve_test_DEPENDENCIES) $(EXTRA_sieve_test_DEPENDENCIES) 
+	@rm -f sieve-test$(EXEEXT)
+	$(AM_V_CCLD)$(sieve_test_LINK) $(sieve_test_OBJECTS) $(sieve_test_LDADD) $(LIBS)
+
+sievec$(EXEEXT): $(sievec_OBJECTS) $(sievec_DEPENDENCIES) $(EXTRA_sievec_DEPENDENCIES) 
+	@rm -f sievec$(EXEEXT)
+	$(AM_V_CCLD)$(sievec_LINK) $(sievec_OBJECTS) $(sievec_LDADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/sieve_dump-sieve-dump.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/sieve_filter-sieve-filter.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/sieve_test-sieve-test.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/sievec-sievec.Po@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
+am--depfiles: $(am__depfiles_remade)
+
+.c.o:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(COMPILE) -c -o $@ $<
+
+.c.obj:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ `$(CYGPATH_W) '$<'`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(COMPILE) -c -o $@ `$(CYGPATH_W) '$<'`
+
+.c.lo:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(LTCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LTCOMPILE) -c -o $@ $<
+
+sieve_dump-sieve-dump.o: sieve-dump.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(sieve_dump_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT sieve_dump-sieve-dump.o -MD -MP -MF $(DEPDIR)/sieve_dump-sieve-dump.Tpo -c -o sieve_dump-sieve-dump.o `test -f 'sieve-dump.c' || echo '$(srcdir)/'`sieve-dump.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/sieve_dump-sieve-dump.Tpo $(DEPDIR)/sieve_dump-sieve-dump.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='sieve-dump.c' object='sieve_dump-sieve-dump.o' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(sieve_dump_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o sieve_dump-sieve-dump.o `test -f 'sieve-dump.c' || echo '$(srcdir)/'`sieve-dump.c
+
+sieve_dump-sieve-dump.obj: sieve-dump.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(sieve_dump_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT sieve_dump-sieve-dump.obj -MD -MP -MF $(DEPDIR)/sieve_dump-sieve-dump.Tpo -c -o sieve_dump-sieve-dump.obj `if test -f 'sieve-dump.c'; then $(CYGPATH_W) 'sieve-dump.c'; else $(CYGPATH_W) '$(srcdir)/sieve-dump.c'; fi`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/sieve_dump-sieve-dump.Tpo $(DEPDIR)/sieve_dump-sieve-dump.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='sieve-dump.c' object='sieve_dump-sieve-dump.obj' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(sieve_dump_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o sieve_dump-sieve-dump.obj `if test -f 'sieve-dump.c'; then $(CYGPATH_W) 'sieve-dump.c'; else $(CYGPATH_W) '$(srcdir)/sieve-dump.c'; fi`
+
+sieve_filter-sieve-filter.o: sieve-filter.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(sieve_filter_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT sieve_filter-sieve-filter.o -MD -MP -MF $(DEPDIR)/sieve_filter-sieve-filter.Tpo -c -o sieve_filter-sieve-filter.o `test -f 'sieve-filter.c' || echo '$(srcdir)/'`sieve-filter.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/sieve_filter-sieve-filter.Tpo $(DEPDIR)/sieve_filter-sieve-filter.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='sieve-filter.c' object='sieve_filter-sieve-filter.o' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(sieve_filter_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o sieve_filter-sieve-filter.o `test -f 'sieve-filter.c' || echo '$(srcdir)/'`sieve-filter.c
+
+sieve_filter-sieve-filter.obj: sieve-filter.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(sieve_filter_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT sieve_filter-sieve-filter.obj -MD -MP -MF $(DEPDIR)/sieve_filter-sieve-filter.Tpo -c -o sieve_filter-sieve-filter.obj `if test -f 'sieve-filter.c'; then $(CYGPATH_W) 'sieve-filter.c'; else $(CYGPATH_W) '$(srcdir)/sieve-filter.c'; fi`
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+
+sieve_test-sieve-test.o: sieve-test.c
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+sieve_test-sieve-test.obj: sieve-test.c
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+
+sievec-sievec.o: sievec.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(sievec_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT sievec-sievec.o -MD -MP -MF $(DEPDIR)/sievec-sievec.Tpo -c -o sievec-sievec.o `test -f 'sievec.c' || echo '$(srcdir)/'`sievec.c
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+
+sievec-sievec.obj: sievec.c
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+
+mostlyclean-libtool:
+	-rm -f *.lo
+
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+	$(am__define_uniq_tagged_files); mkid -fID $$unique
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+	      "$$@" $$unique; \
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+	      $$unique; \
+	  fi; \
+	fi
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+
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+	esac; \
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+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
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+
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+	    || cp -p $$d/$$file "$(distdir)/$$file" \
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+	  fi; \
+	done
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+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
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+	-rm -f ./$(DEPDIR)/sieve_filter-sieve-filter.Po
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+	-rm -f ./$(DEPDIR)/sievec-sievec.Po
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+# Otherwise a system limit (for SysV at least) may be exceeded.
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diff --git a/pigeonhole/src/sieve-tools/sieve-dump.c b/pigeonhole/src/sieve-tools/sieve-dump.c
new file mode 100644
index 0000000..23b2be4
--- /dev/null
+++ b/pigeonhole/src/sieve-tools/sieve-dump.c
@@ -0,0 +1,97 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "array.h"
+#include "master-service.h"
+#include "master-service-settings.h"
+#include "mail-storage-service.h"
+#include "mail-user.h"
+
+#include "sieve.h"
+#include "sieve-extensions.h"
+#include "sieve-tool.h"
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <sysexits.h>
+
+/*
+ * Print help
+ */
+
+static void print_help(void)
+{
+	printf(
+"Usage: sieve-dump [-c <config-file>] [-D] [-h] [-P <plugin>] [-x <extensions>]\n"
+"                  <sieve-binary> [<out-file>]\n"
+	);
+}
+
+/*
+ * Tool implementation
+ */
+
+int main(int argc, char **argv)
+{
+	struct sieve_instance *svinst;
+	struct sieve_binary *sbin;
+	const char *binfile, *outfile;
+	bool hexdump = FALSE;
+	int exit_status = EXIT_SUCCESS;
+	int c;
+
+	sieve_tool = sieve_tool_init("sieve-dump", &argc, &argv, "DhP:x:", FALSE);
+
+	outfile = NULL;
+
+	while ((c = sieve_tool_getopt(sieve_tool)) > 0) {
+		switch (c) {
+		case 'h':
+			/* produce hexdump */
+			hexdump = TRUE;
+			break;
+		default:
+			print_help();
+			i_fatal_status(EX_USAGE, "Unknown argument: %c", c);
+			break;
+		}
+	}
+
+	if ( optind < argc ) {
+		binfile = argv[optind++];
+	} else {
+		print_help();
+		i_fatal_status(EX_USAGE, "Missing <script-file> argument");
+	}
+
+	if ( optind < argc ) {
+		outfile = argv[optind++];
+	}
+
+	/* Finish tool initialization */
+	svinst = sieve_tool_init_finish(sieve_tool, FALSE, TRUE);
+
+        /* Enable debug extension */
+        sieve_enable_debug_extension(svinst);
+
+	/* Dump binary */
+	sbin = sieve_load(svinst, binfile, NULL);
+	if ( sbin != NULL ) {
+		sieve_tool_dump_binary_to(sbin, outfile == NULL ? "-" : outfile, hexdump);
+
+		sieve_close(&sbin);
+	} else {
+		i_error("failed to load binary: %s", binfile);
+		exit_status = EXIT_FAILURE;
+	}
+
+	sieve_tool_deinit(&sieve_tool);
+
+	return exit_status;
+}
+
diff --git a/pigeonhole/src/sieve-tools/sieve-filter.c b/pigeonhole/src/sieve-tools/sieve-filter.c
new file mode 100644
index 0000000..2b98fe6
--- /dev/null
+++ b/pigeonhole/src/sieve-tools/sieve-filter.c
@@ -0,0 +1,614 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "lib-signals.h"
+#include "ioloop.h"
+#include "env-util.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "ostream.h"
+#include "array.h"
+#include "mail-namespace.h"
+#include "mail-storage.h"
+#include "mail-search-build.h"
+
+#include "sieve.h"
+#include "sieve-extensions.h"
+#include "sieve-binary.h"
+
+#include "sieve-tool.h"
+
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <pwd.h>
+#include <sysexits.h>
+
+/*
+ * Print help
+ */
+
+static void print_help(void)
+{
+	printf(
+"Usage: sieve-filter [-c <config-file>] [-C] [-D] [-e] [-m <default-mailbox>]\n"
+"                    [-P <plugin>] [-q <output-mailbox>] [-Q <mail-command>]\n"
+"                    [-s <script-file>] [-u <user>] [-v] [-W] [-x <extensions>]\n"
+"                    <script-file> <source-mailbox> [<discard-action>]\n"
+	);
+}
+
+enum sieve_filter_discard_action {
+	SIEVE_FILTER_DACT_KEEP,   /* Keep discarded messages in source folder */
+	SIEVE_FILTER_DACT_MOVE,   /* Move discarded messages to Trash folder */
+	SIEVE_FILTER_DACT_DELETE, /* Flag discarded messages as \DELETED */
+	SIEVE_FILTER_DACT_EXPUNGE /* Expunge discarded messages */
+};
+
+struct sieve_filter_data {
+	enum sieve_filter_discard_action discard_action;
+	struct mailbox *move_mailbox;
+
+	struct sieve_script_env *senv;
+	struct sieve_binary *main_sbin;
+	struct sieve_error_handler *ehandler;
+
+	bool execute:1;
+	bool source_write:1;
+	bool default_move:1;
+};
+
+struct sieve_filter_context {
+	const struct sieve_filter_data *data;
+
+	struct mailbox_transaction_context *move_trans;
+
+	struct ostream *teststream;
+};
+
+static const char *
+result_amend_log_message(const struct sieve_script_env *senv,
+			 enum log_type log_type, const char *message)
+{
+	const struct sieve_message_data *msgdata = senv->script_context;
+	string_t *str;
+
+	if (log_type == LOG_TYPE_DEBUG)
+		return message;
+
+	str = t_str_new(256);
+	str_printfa(str, "msgid=%s", (msgdata->id == NULL ?
+				      "unspecified" : msgdata->id));
+	str_append(str, ": ");
+	str_append(str, message);
+
+	return str_c(str);
+}
+
+static int filter_message(struct sieve_filter_context *sfctx, struct mail *mail)
+{
+	struct sieve_error_handler *ehandler = sfctx->data->ehandler;
+	enum sieve_execute_flags exflags = SIEVE_EXECUTE_FLAG_LOG_RESULT;
+	struct sieve_script_env *senv = sfctx->data->senv;
+	struct sieve_exec_status estatus;
+	struct sieve_binary *sbin;
+	struct sieve_message_data msgdata;
+	bool execute = sfctx->data->execute;
+	bool source_write = sfctx->data->source_write;
+	const char *subject, *date;
+	uoff_t size = 0;
+	int ret;
+
+	/* Initialize execution status */
+	i_zero(&estatus);
+	senv->exec_status = &estatus;
+
+	/* Collect necessary message data */
+	i_zero(&msgdata);
+	msgdata.mail = mail;
+	msgdata.auth_user = senv->user->username;
+	(void)mail_get_message_id(mail, &msgdata.id);
+	senv->script_context = &msgdata;
+
+	sieve_tool_get_envelope_data(&msgdata, mail, NULL, NULL, NULL);
+
+	if (mail_get_virtual_size(mail, &size) < 0) {
+		if (mail->expunged)
+			return 1;
+
+		sieve_error(ehandler, NULL, "failed to obtain message size; "
+			    "skipping this message (id=%s)",
+			    (msgdata.id == NULL ? "none" : msgdata.id));
+		return 0;
+	}
+
+	if (mail_get_first_header(mail, "date", &date) <= 0)
+		date = "";
+	if (mail_get_first_header(mail, "subject", &subject) <= 0)
+		subject = "";
+
+	/* Single script */
+	sbin = sfctx->data->main_sbin;
+
+	/* Execute script */
+	if (execute) {
+		sieve_info(ehandler, NULL,
+			   "filtering: [%s; %"PRIuUOFF_T" bytes] `%s'",
+			   date, size, str_sanitize(subject, 40));
+
+		ret = sieve_execute(sbin, &msgdata, senv, ehandler, ehandler,
+				    exflags);
+	} else {
+		o_stream_nsend_str(
+			sfctx->teststream,
+			t_strdup_printf(">> Filtering message:\n\n"
+					"  ID:      %s\n"
+					"  Date:    %s\n"
+					"  Size:    %"PRIuUOFF_T" bytes\n"
+					"  Subject: %s\n",
+					(msgdata.id == NULL ?
+					 "none" : msgdata.id), date, size,
+					str_sanitize(subject, 40)));
+
+		ret = sieve_test(sbin, &msgdata, senv, ehandler,
+				 sfctx->teststream, exflags);
+	}
+
+	/* Handle message in source folder */
+	if (ret > 0) {
+		struct mailbox *move_box = sfctx->data->move_mailbox;
+		enum sieve_filter_discard_action discard_action =
+			sfctx->data->discard_action;
+
+		if (!source_write) {
+			/* READ-ONLY; Do nothing */
+		} else if (estatus.keep_original) {
+			/* Explicitly `stored' in source box; just keep it there */
+			sieve_info(ehandler, NULL,
+				   "message kept in source mailbox");
+		} else if (estatus.message_saved) {
+			sieve_info(
+				ehandler, NULL,
+				"message expunged from source mailbox upon successful move");
+
+			if (execute)
+				mail_expunge(mail);
+		} else {
+			switch (discard_action) {
+			/* Leave it there */
+			case SIEVE_FILTER_DACT_KEEP:
+				sieve_info(ehandler, NULL,
+					   "message left in source mailbox");
+				break;
+			/* Move message to indicated folder */
+			case SIEVE_FILTER_DACT_MOVE:
+				sieve_info(
+					ehandler, NULL,
+					"message in source mailbox moved to mailbox '%s'",
+					mailbox_get_name(move_box));
+
+				if (execute && move_box != NULL) {
+					struct mailbox_transaction_context *t =
+						sfctx->move_trans;
+					struct mail_save_context *save_ctx;
+
+					save_ctx = mailbox_save_alloc(t);
+
+					if (mailbox_copy(&save_ctx, mail) < 0) {
+						enum mail_error error;
+						const char *errstr;
+
+						errstr = mail_storage_get_last_error(
+							mailbox_get_storage(move_box), &error);
+
+						sieve_error(
+							ehandler, NULL,
+							"failed to move message to mailbox %s: %s",
+							mailbox_get_name(move_box), errstr);
+						return -1;
+					}
+					mail_expunge(mail);
+				}
+				break;
+			/* Flag message as \DELETED */
+			case SIEVE_FILTER_DACT_DELETE:
+				sieve_info(
+					ehandler, NULL,
+					"message flagged as deleted in source mailbox");
+				if (execute)
+					mail_update_flags(mail, MODIFY_ADD, MAIL_DELETED);
+				break;
+			/* Expunge the message immediately */
+			case SIEVE_FILTER_DACT_EXPUNGE:
+				sieve_info(ehandler, NULL,
+					   "message expunged from source mailbox");
+				if (execute)
+					mail_expunge(mail);
+				break;
+			/* Unknown */
+			default:
+				i_unreached();
+				break;
+			}
+		}
+	}
+
+	switch (ret) {
+	case SIEVE_EXEC_OK:
+		break;
+	case SIEVE_EXEC_RESOURCE_LIMIT:
+		sieve_error(ehandler, NULL, "sieve resource limit exceeded");
+		return -1;
+	case SIEVE_EXEC_BIN_CORRUPT:
+		sieve_error(ehandler, NULL, "sieve script binary is corrupt");
+		return -1;
+	case SIEVE_EXEC_FAILURE:
+	case SIEVE_EXEC_TEMP_FAILURE:
+		if (source_write && execute && sfctx->data->default_move &&
+		    !estatus.keep_original && estatus.message_saved) {
+			/* The implicit keep action moved message to default
+			   mailbox, so the source message still needs to be
+			   expunged */
+			sieve_error(
+				ehandler, NULL,
+				"sieve script execution failed for this message; "
+				"message moved to default mailbox");
+			mail_expunge(mail);
+			return 0;
+		}
+		/* Fall through */
+	case SIEVE_EXEC_KEEP_FAILED:
+		sieve_error(
+			ehandler, NULL,
+			"sieve script execution failed for this message; "
+			"message left in source mailbox");
+		return 0;
+	}
+
+	return 1;
+}
+
+/* FIXME: introduce this into Dovecot */
+static void
+mail_search_build_add_flags(struct mail_search_args *args,
+			    enum mail_flags flags, bool not)
+{
+	struct mail_search_arg *arg;
+
+	arg = p_new(args->pool, struct mail_search_arg, 1);
+	arg->type = SEARCH_FLAGS;
+	arg->value.flags = flags;
+	arg->match_not = not;
+
+	arg->next = args->args;
+	args->args = arg;
+}
+
+static int
+filter_mailbox(const struct sieve_filter_data *sfdata, struct mailbox *src_box)
+{
+	struct sieve_filter_context sfctx;
+	struct mailbox *move_box = sfdata->move_mailbox;
+	struct sieve_error_handler *ehandler = sfdata->ehandler;
+	struct mail_search_args *search_args;
+	struct mailbox_transaction_context *t;
+	struct mail_search_context *search_ctx;
+	struct mail *mail;
+	int ret = 1;
+
+	/* Sync source mailbox */
+
+	if (mailbox_sync(src_box, MAILBOX_SYNC_FLAG_FULL_READ) < 0) {
+		sieve_error(ehandler, NULL, "failed to sync source mailbox");
+		return -1;
+	}
+
+	/* Initialize */
+
+	i_zero(&sfctx);
+	sfctx.data = sfdata;
+
+	/* Create test stream */
+	if (!sfdata->execute) {
+		sfctx.teststream = o_stream_create_fd(1, 0);
+		o_stream_set_no_error_handling(sfctx.teststream, TRUE);
+	}
+
+	/* Start move mailbox transaction */
+
+	if (move_box != NULL) {
+		sfctx.move_trans = mailbox_transaction_begin(
+			move_box, MAILBOX_TRANSACTION_FLAG_EXTERNAL,
+			"sieve_filter_data move_box");
+	}
+
+	/* Search non-deleted messages in the source folder */
+
+	search_args = mail_search_build_init();
+	mail_search_build_add_flags(search_args, MAIL_DELETED, TRUE);
+
+	t = mailbox_transaction_begin(src_box, 0,
+				      "sieve_filter_data src_box");
+	search_ctx = mailbox_search_init(t, search_args, NULL, 0, NULL);
+	mail_search_args_unref(&search_args);
+
+	/* Iterate through all requested messages */
+
+	while (ret >= 0 && mailbox_search_next(search_ctx, &mail))
+		ret = filter_message(&sfctx, mail);
+
+	/* Cleanup */
+
+	if (mailbox_search_deinit(&search_ctx) < 0)
+		ret = -1;
+
+	if (sfctx.move_trans != NULL) {
+		if (mailbox_transaction_commit(&sfctx.move_trans) < 0)
+			ret = -1;
+	}
+
+	if (mailbox_transaction_commit(&t) < 0)
+		ret = -1;
+
+	if (sfctx.teststream != NULL)
+		o_stream_destroy(&sfctx.teststream);
+
+	if (ret < 0) return ret;
+
+	/* Sync mailbox */
+
+	if (sfdata->execute) {
+		if (mailbox_sync(src_box, MAILBOX_SYNC_FLAG_FULL_WRITE) < 0) {
+			sieve_error(ehandler, NULL,
+				    "failed to sync source mailbox");
+			return -1;
+		}
+	}
+
+	return ret;
+}
+
+/*
+ * Tool implementation
+ */
+
+int main(int argc, char **argv)
+{
+	struct sieve_instance *svinst;
+	ARRAY_TYPE(const_string) scriptfiles;
+	const char *scriptfile,	*src_mailbox, *dst_mailbox, *move_mailbox;
+	struct sieve_filter_data sfdata;
+	enum sieve_filter_discard_action discard_action =
+		SIEVE_FILTER_DACT_KEEP;
+	struct mail_user *mail_user;
+	struct sieve_binary *main_sbin;
+	struct sieve_script_env scriptenv;
+	struct sieve_error_handler *ehandler;
+	bool force_compile, execute, source_write, verbose, default_move;
+	struct mail_namespace *ns;
+	struct mailbox *src_box = NULL, *move_box = NULL;
+	enum mailbox_flags open_flags = MAILBOX_FLAG_IGNORE_ACLS;
+	enum mail_error error;
+	const char *errstr;
+	int c;
+
+	sieve_tool = sieve_tool_init("sieve-filter", &argc, &argv,
+				     "m:s:x:P:u:q:Q:DCevW", FALSE);
+
+	t_array_init(&scriptfiles, 16);
+
+	/* Parse arguments */
+	dst_mailbox = move_mailbox = NULL;
+	force_compile = execute = source_write = default_move = FALSE;
+	verbose = FALSE;	
+	while ((c = sieve_tool_getopt(sieve_tool)) > 0) {
+		switch (c) {
+		case 'm':
+			/* default mailbox (keep box) */
+			dst_mailbox = optarg;
+			break;
+		case 's':
+			/* scriptfile executed before main script */
+			{
+				const char *file;
+
+				file = t_strdup(optarg);
+				array_append(&scriptfiles, &file, 1);
+
+				/* FIXME: */
+				i_fatal_status(
+					EX_USAGE,
+					"The -s argument is currently NOT IMPLEMENTED");
+			}
+			break;
+		case 'q':
+			i_fatal_status(
+				EX_USAGE,
+				"The -q argument is currently NOT IMPLEMENTED");
+			break;
+		case 'Q':
+			i_fatal_status(
+				EX_USAGE,
+				"The -Q argument is currently NOT IMPLEMENTED");
+			break;
+		case 'e':
+			/* execution mode */
+			execute = TRUE;
+			break;
+		case 'C':
+			/* force script compile */
+			force_compile = TRUE;
+			break;
+		case 'W':
+			/* enable source mailbox write */
+			source_write = TRUE;
+			break;
+		case 'v':
+			/* enable verbose output */
+			verbose = TRUE;
+			break;
+		default:
+			/* unrecognized option */
+			print_help();
+			i_fatal_status(EX_USAGE, "Unknown argument: %c", c);
+			break;
+		}
+	}
+
+	/* Script file argument */
+	if (optind < argc)
+		scriptfile = t_strdup(argv[optind++]);
+	else {
+		print_help();
+		i_fatal_status(EX_USAGE, "Missing <script-file> argument");
+	}
+
+	/* Source mailbox argument */
+	if (optind < argc)
+		src_mailbox = t_strdup(argv[optind++]);
+	else {
+		print_help();
+		i_fatal_status(EX_USAGE, "Missing <source-mailbox> argument");
+	}
+
+	/* Source action argument */
+	if (optind < argc) {
+		const char *srcact = argv[optind++];
+
+		if (strcmp(srcact, "keep") == 0) {
+			discard_action = SIEVE_FILTER_DACT_KEEP;
+		} else if (strcmp(srcact, "move") == 0) {
+			discard_action = SIEVE_FILTER_DACT_MOVE;
+			if (optind < argc)
+				move_mailbox = t_strdup(argv[optind++]);
+			else {
+				print_help();
+				i_fatal_status(
+					EX_USAGE,
+					"Invalid <discard-action> argument: "
+					"the `move' action requires mailbox argument");
+			}
+		} else if (strcmp(srcact, "delete") == 0) {
+			discard_action = SIEVE_FILTER_DACT_DELETE;
+		} else if (strcmp(srcact, "expunge") == 0) {
+			discard_action = SIEVE_FILTER_DACT_EXPUNGE;
+		} else {
+			print_help();
+			i_fatal_status(EX_USAGE,
+				       "Invalid <discard-action> argument");
+		}
+	}
+
+	if (optind != argc) {
+		print_help();
+		i_fatal_status(EX_USAGE, "Unknown argument: %s", argv[optind]);
+	}
+
+	if (dst_mailbox == NULL) {
+		dst_mailbox = src_mailbox;
+	} else {
+		/* The (implicit) keep action will move the message */
+		default_move = TRUE;
+	}
+
+	/* Finish tool initialization */
+	svinst = sieve_tool_init_finish(sieve_tool, TRUE, FALSE);
+
+	/* Enable debug extension */
+	sieve_enable_debug_extension(svinst);
+
+	/* Create error handler */
+	ehandler = sieve_stderr_ehandler_create(svinst, 0);
+	sieve_error_handler_accept_infolog(ehandler, verbose);
+	sieve_error_handler_accept_debuglog(ehandler, svinst->debug);
+
+	/* Compile main sieve script */
+	if (force_compile) {
+		main_sbin = sieve_tool_script_compile(svinst, scriptfile, NULL);
+		if (main_sbin != NULL)
+			(void)sieve_save(main_sbin, TRUE, NULL);
+	} else {
+		main_sbin = sieve_tool_script_open(svinst, scriptfile);
+	}
+
+	/* Initialize mail user */
+	mail_user = sieve_tool_get_mail_user(sieve_tool);
+
+	/* Open the source mailbox */
+
+	ns = mail_namespace_find(mail_user->namespaces, src_mailbox);
+	if (ns == NULL) {
+		i_fatal("Unknown namespace for source mailbox '%s'",
+			src_mailbox);
+	}
+
+	if (!source_write || !execute)
+		open_flags |= MAILBOX_FLAG_READONLY;
+
+	src_box = mailbox_alloc(ns->list, src_mailbox, open_flags);
+	if (mailbox_open(src_box) < 0) {
+		i_fatal("Couldn't open source mailbox '%s': %s",
+			src_mailbox, mailbox_get_last_internal_error(src_box, &error));
+	}
+
+	/* Open move box if necessary */
+
+	if (execute && discard_action == SIEVE_FILTER_DACT_MOVE &&
+	    move_mailbox != NULL) {
+		ns = mail_namespace_find(mail_user->namespaces, move_mailbox);
+		if (ns == NULL)
+			i_fatal("Unknown namespace for mailbox '%s'",
+				move_mailbox);
+
+		move_box = mailbox_alloc(ns->list, move_mailbox, open_flags);
+		if (mailbox_open(move_box) < 0) {
+			i_fatal("Couldn't open mailbox '%s': %s",
+				move_mailbox,
+				mailbox_get_last_internal_error(move_box, &error));
+		}
+
+		if (mailbox_backends_equal(src_box, move_box))
+			i_fatal("Source mailbox and mailbox for move action are identical.");
+	}
+
+	/* Compose script environment */
+	if (sieve_script_env_init(&scriptenv, mail_user, &errstr) < 0)
+		i_fatal("Failed to initialize script execution: %s", errstr);
+	scriptenv.mailbox_autocreate = FALSE;
+	scriptenv.default_mailbox = dst_mailbox;
+	scriptenv.result_amend_log_message = result_amend_log_message;
+
+	/* Compose filter context */
+	i_zero(&sfdata);
+	sfdata.senv = &scriptenv;
+	sfdata.discard_action = discard_action;
+	sfdata.move_mailbox = move_box;
+	sfdata.main_sbin = main_sbin;
+	sfdata.ehandler = ehandler;
+	sfdata.execute = execute;
+	sfdata.source_write = source_write;
+	sfdata.default_move = default_move;
+
+	/* Apply Sieve filter to all messages found */
+	(void)filter_mailbox(&sfdata, src_box);
+
+	/* Close the source mailbox */
+	if (src_box != NULL)
+		mailbox_free(&src_box);
+
+	/* Close the move mailbox */
+	if (move_box != NULL)
+		mailbox_free(&move_box);
+
+	/* Close the script binary */
+	if (main_sbin != NULL)
+		sieve_close(&main_sbin);
+
+	/* Cleanup error handler */
+	sieve_error_handler_unref(&ehandler);
+
+	sieve_tool_deinit(&sieve_tool);
+
+	return 0;
+}
diff --git a/pigeonhole/src/sieve-tools/sieve-test.c b/pigeonhole/src/sieve-tools/sieve-test.c
new file mode 100644
index 0000000..e7345be
--- /dev/null
+++ b/pigeonhole/src/sieve-tools/sieve-test.c
@@ -0,0 +1,515 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "lib-signals.h"
+#include "ioloop.h"
+#include "env-util.h"
+#include "str.h"
+#include "ostream.h"
+#include "array.h"
+#include "mail-namespace.h"
+#include "mail-storage.h"
+#include "master-service.h"
+#include "master-service-settings.h"
+#include "mail-storage-service.h"
+
+#include "sieve.h"
+#include "sieve-binary.h"
+#include "sieve-extensions.h"
+
+#include "sieve-tool.h"
+
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <pwd.h>
+#include <sysexits.h>
+
+
+/*
+ * Configuration
+ */
+
+#define DEFAULT_SENDMAIL_PATH "/usr/lib/sendmail"
+
+/*
+ * Print help
+ */
+
+static void print_help(void)
+{
+	printf(
+"Usage: sieve-test [-a <orig-recipient-address] [-c <config-file>]\n"
+"                  [-C] [-D] [-d <dump-filename>] [-e]\n"
+"                  [-f <envelope-sender>] [-l <mail-location>]\n"
+"                  [-m <default-mailbox>] [-P <plugin>]\n"
+"                  [-r <recipient-address>] [-s <script-file>]\n"
+"                  [-t <trace-file>] [-T <trace-option>] [-x <extensions>]\n"
+"                  <script-file> <mail-file>\n"
+	);
+}
+
+/*
+ * Dummy SMTP session
+ */
+
+static void *
+sieve_smtp_start(const struct sieve_script_env *senv ATTR_UNUSED,
+		 const struct smtp_address *mail_from)
+{
+	struct ostream *output;
+
+	i_info("sending message from <%s>:", smtp_address_encode(mail_from));
+
+	output = o_stream_create_fd(STDOUT_FILENO, (size_t)-1);
+	o_stream_set_no_error_handling(output, TRUE);
+	return (void*)output;
+}
+
+static void
+sieve_smtp_add_rcpt(const struct sieve_script_env *senv ATTR_UNUSED,
+		    void *handle ATTR_UNUSED,
+		    const struct smtp_address *rcpt_to)
+{
+	printf("\nRECIPIENT: %s\n", smtp_address_encode(rcpt_to));
+}
+
+static struct ostream *
+sieve_smtp_send(const struct sieve_script_env *senv ATTR_UNUSED, void *handle)
+{
+	printf("START MESSAGE:\n");
+
+	return (struct ostream *)handle;
+}
+
+static void
+sieve_smtp_abort(const struct sieve_script_env *senv ATTR_UNUSED, void *handle)
+{
+	struct ostream *output = (struct ostream *)handle;
+
+	printf("#### ABORT MESSAGE ####\n\n");
+	o_stream_unref(&output);
+}
+
+static int
+sieve_smtp_finish(const struct sieve_script_env *senv ATTR_UNUSED, void *handle,
+		  const char **error_r ATTR_UNUSED)
+{
+	struct ostream *output = (struct ostream *)handle;
+
+	printf("END MESSAGE\n\n");
+	o_stream_unref(&output);
+	return 1;
+}
+
+/*
+ * Dummy duplicate check implementation
+ */
+
+static void *
+duplicate_transaction_begin(const struct sieve_script_env *senv ATTR_UNUSED)
+{
+	return NULL;
+}
+
+static void duplicate_transaction_commit(void **_dup_trans ATTR_UNUSED)
+{
+}
+
+static void duplicate_transaction_rollback(void **_dup_trans ATTR_UNUSED)
+{
+}
+
+static int
+duplicate_check(void *_dup_trans ATTR_UNUSED,
+		const struct sieve_script_env *senv,
+		const void *id ATTR_UNUSED, size_t id_size ATTR_UNUSED)
+{
+	i_info("checked duplicate for user %s.\n", senv->user->username);
+	return 0;
+}
+
+static void
+duplicate_mark(void *_dup_trans ATTR_UNUSED,
+	       const struct sieve_script_env *senv,
+	       const void *id ATTR_UNUSED, size_t id_size ATTR_UNUSED,
+	       time_t time ATTR_UNUSED)
+{
+	i_info("marked duplicate for user %s.\n", senv->user->username);
+}
+
+/*
+ * Result logging
+ */
+
+static const char *
+result_amend_log_message(const struct sieve_script_env *senv,
+			 enum log_type log_type, const char *message)
+{
+	const struct sieve_message_data *msgdata = senv->script_context;
+	string_t *str;
+
+	if (log_type == LOG_TYPE_DEBUG)
+		return message;
+
+	str = t_str_new(256);
+	str_printfa(str, "msgid=%s", (msgdata->id == NULL ?
+				      "unspecified" : msgdata->id));
+	str_append(str, ": ");
+	str_append(str, message);
+
+	return str_c(str);
+}
+
+/*
+ * Tool implementation
+ */
+
+int main(int argc, char **argv)
+{
+	struct sieve_instance *svinst;
+	ARRAY_TYPE (const_string) scriptfiles;
+	const char *scriptfile, *mailbox, *dumpfile, *tracefile, *mailfile,
+		*mailloc, *errstr;
+	struct smtp_address *rcpt_to, *final_rcpt_to, *mail_from;
+	struct sieve_trace_config trace_config;
+	struct mail *mail;
+	struct sieve_binary *main_sbin, *sbin = NULL;
+	struct sieve_message_data msgdata;
+	struct sieve_script_env scriptenv;
+	struct sieve_exec_status estatus;
+	enum sieve_execute_flags exflags = SIEVE_EXECUTE_FLAG_LOG_RESULT;
+	struct sieve_error_handler *ehandler;
+	struct ostream *teststream = NULL;
+	struct sieve_trace_log *trace_log = NULL;
+	bool force_compile = FALSE, execute = FALSE;
+	int exit_status = EXIT_SUCCESS;
+	int ret, c;
+
+	sieve_tool = sieve_tool_init("sieve-test", &argc, &argv,
+				     "r:a:f:m:d:l:s:eCt:T:DP:x:u:", FALSE);
+
+	ehandler = NULL;
+	t_array_init(&scriptfiles, 16);
+
+	/* Parse arguments */
+	mailbox = dumpfile = tracefile = mailloc = NULL;
+	mail_from = final_rcpt_to = rcpt_to = NULL;
+	i_zero(&trace_config);
+	trace_config.level = SIEVE_TRLVL_ACTIONS;
+	while ((c = sieve_tool_getopt(sieve_tool)) > 0) {
+		switch (c) {
+		case 'r':
+			/* final recipient address */
+			if (smtp_address_parse_mailbox(
+				pool_datastack_create(), optarg,
+				SMTP_ADDRESS_PARSE_FLAG_ALLOW_LOCALPART,
+				&final_rcpt_to, &errstr) < 0)
+				i_fatal("Invalid -r parameter: %s", errstr);
+			break;
+		case 'a':
+			/* original recipient address */
+			if (smtp_address_parse_mailbox(
+				pool_datastack_create(), optarg,
+				SMTP_ADDRESS_PARSE_FLAG_ALLOW_LOCALPART,
+				&rcpt_to, &errstr) < 0)
+				i_fatal("Invalid -a parameter: %s", errstr);
+			break;
+		case 'f':
+			/* envelope sender address */
+			if (smtp_address_parse_mailbox(
+				pool_datastack_create(), optarg,
+				0, &mail_from, &errstr) < 0)
+				i_fatal("Invalid -f parameter: %s", errstr);
+			break;
+		case 'm':
+			/* default mailbox (keep box) */
+			mailbox = optarg;
+			break;
+		case 'l':
+			/* mail location */
+			mailloc = optarg;
+			break;
+		case 't':
+			/* trace file */
+			tracefile = optarg;
+			break;
+			/* trace options */
+		case 'T':
+			sieve_tool_parse_trace_option(&trace_config, optarg);
+			break;
+		case 'd':
+			/* dump file */
+			dumpfile = optarg;
+			break;
+		case 's':
+			/* scriptfile executed before main script */
+			{
+				const char *file;
+
+				file = t_strdup(optarg);
+				array_append(&scriptfiles, &file, 1);
+			}
+			break;
+			/* execution mode */
+		case 'e':
+			execute = TRUE;
+			break;
+			/* force script compile */
+		case 'C':
+			force_compile = TRUE;
+			break;
+		default:
+			/* unrecognized option */
+			print_help();
+			i_fatal_status(EX_USAGE, "Unknown argument: %c", c);
+			break;
+		}
+	}
+
+	if (optind < argc)
+		scriptfile = argv[optind++];
+	else {
+		print_help();
+		i_fatal_status(EX_USAGE, "Missing <script-file> argument");
+	}
+
+	if (optind < argc)
+		mailfile = argv[optind++];
+	else {
+		print_help();
+		i_fatal_status(EX_USAGE, "Missing <mail-file> argument");
+	}
+
+	if (optind != argc) {
+		print_help();
+		i_fatal_status(EX_USAGE, "Unknown argument: %s", argv[optind]);
+	}
+
+	/* Finish tool initialization */
+	svinst = sieve_tool_init_finish(sieve_tool, mailloc == NULL, FALSE);
+
+	/* Enable debug extension */
+	sieve_enable_debug_extension(svinst);
+
+	/* Create error handler */
+	ehandler = sieve_stderr_ehandler_create(svinst, 0);
+	sieve_error_handler_accept_infolog(ehandler, TRUE);
+	sieve_error_handler_accept_debuglog(ehandler, svinst->debug);
+
+	/* Compile main sieve script */
+	if (force_compile) {
+		main_sbin = sieve_tool_script_compile(svinst, scriptfile, NULL);
+		if (main_sbin != NULL)
+			(void)sieve_save(main_sbin, TRUE, NULL);
+	} else {
+		main_sbin = sieve_tool_script_open(svinst, scriptfile);
+	}
+
+	if (main_sbin == NULL) {
+		exit_status = EXIT_FAILURE;
+	} else {
+		/* Dump script */
+		sieve_tool_dump_binary_to(main_sbin, dumpfile, FALSE);
+
+		/* Obtain mail namespaces from -l argument */
+		if (mailloc != NULL)
+			sieve_tool_init_mail_user(sieve_tool, mailloc);
+
+		/* Initialize raw mail object */
+		mail = sieve_tool_open_file_as_mail(sieve_tool, mailfile);
+
+		if (mailbox == NULL)
+			mailbox = "INBOX";
+
+		/* Collect necessary message data */
+		i_zero(&msgdata);
+		msgdata.mail = mail;
+		msgdata.auth_user = sieve_tool_get_username(sieve_tool);
+		(void)mail_get_message_id(mail, &msgdata.id);
+
+		sieve_tool_get_envelope_data(&msgdata, mail,
+					     mail_from, rcpt_to, final_rcpt_to);
+
+		/* Create streams for test and trace output */
+
+		if (!execute) {
+			teststream = o_stream_create_fd(1, 0);
+			o_stream_set_no_error_handling(teststream, TRUE);
+		}
+
+		if (tracefile != NULL) {
+			(void)sieve_trace_log_create(
+				svinst, (strcmp(tracefile, "-") == 0 ?
+					 NULL : tracefile), &trace_log);
+		}
+
+		/* Compose script environment */
+		if (sieve_script_env_init(
+			&scriptenv, sieve_tool_get_mail_user(sieve_tool),
+			&errstr) < 0) {
+			i_fatal("Failed to initialize script execution: %s",
+				errstr);
+		}
+
+		scriptenv.default_mailbox = mailbox;
+		scriptenv.smtp_start = sieve_smtp_start;
+		scriptenv.smtp_add_rcpt = sieve_smtp_add_rcpt;
+		scriptenv.smtp_send = sieve_smtp_send;
+		scriptenv.smtp_abort = sieve_smtp_abort;
+		scriptenv.smtp_finish = sieve_smtp_finish;
+		scriptenv.duplicate_transaction_begin =
+			duplicate_transaction_begin;
+		scriptenv.duplicate_transaction_commit =
+			duplicate_transaction_commit;
+		scriptenv.duplicate_transaction_rollback =
+			duplicate_transaction_rollback;
+		scriptenv.duplicate_mark = duplicate_mark;
+		scriptenv.duplicate_check = duplicate_check;
+		scriptenv.result_amend_log_message = result_amend_log_message;
+		scriptenv.trace_log = trace_log;
+		scriptenv.trace_config = trace_config;
+		scriptenv.script_context = &msgdata;
+
+		i_zero(&estatus);
+		scriptenv.exec_status = &estatus;
+
+		/* Run the test */
+		ret = 1;
+		if (array_count(&scriptfiles) == 0) {
+			/* Single script */
+			sbin = main_sbin;
+			main_sbin = NULL;
+
+			/* Execute/Test script */
+			if (execute) {
+				ret = sieve_execute(sbin, &msgdata, &scriptenv,
+						    ehandler, ehandler,
+						    exflags);
+			} else {
+				ret = sieve_test(sbin, &msgdata, &scriptenv,
+						 ehandler, teststream, exflags);
+			}
+		} else {
+			/* Multiple scripts */
+			const char *const *sfiles;
+			unsigned int i, count;
+			struct sieve_multiscript *mscript;
+			bool more = TRUE;
+
+			if (execute)
+				mscript = sieve_multiscript_start_execute(
+					svinst, &msgdata, &scriptenv);
+			else
+				mscript = sieve_multiscript_start_test(
+					svinst, &msgdata, &scriptenv,
+					teststream);
+
+			/* Execute scripts sequentially */
+			sfiles = array_get(&scriptfiles, &count);
+			for (i = 0; i < count && more; i++) {
+				if (teststream != NULL) {
+					o_stream_nsend_str(
+						teststream,
+						t_strdup_printf("\n## Executing script: %s\n",
+								sfiles[i]));
+				}
+
+				/* Close previous script */
+				if (sbin != NULL)
+					sieve_close(&sbin);
+
+				/* Compile sieve script */
+				if (force_compile) {
+					sbin = sieve_tool_script_compile(
+						svinst, sfiles[i], sfiles[i]);
+					if (sbin != NULL)
+						(void)sieve_save(sbin, FALSE, NULL);
+				} else {
+					sbin = sieve_tool_script_open(svinst, sfiles[i]);
+				}
+
+				if (sbin == NULL) {
+					ret = SIEVE_EXEC_FAILURE;
+					break;
+				}
+
+				/* Execute/Test script */
+				more = sieve_multiscript_run(
+					mscript, sbin, ehandler, ehandler,
+					exflags);
+			}
+
+			/* Execute/Test main script */
+			if (more && ret > 0) {
+				if (teststream != NULL) {
+					o_stream_nsend_str(
+						teststream,
+						t_strdup_printf("## Executing script: %s\n",
+								scriptfile));
+				}
+
+				/* Close previous script */
+				if (sbin != NULL)
+					sieve_close(&sbin);
+
+				sbin = main_sbin;
+				main_sbin = NULL;
+
+				(void)sieve_multiscript_run(
+					mscript, sbin, ehandler, ehandler,
+					exflags);
+			}
+
+			ret = sieve_multiscript_finish(&mscript, ehandler,
+						       exflags, ret);
+		}
+
+		/* Run */
+		switch (ret) {
+		case SIEVE_EXEC_OK:
+			i_info("final result: success");
+			break;
+		case SIEVE_EXEC_RESOURCE_LIMIT:
+			i_info("resource limit exceeded");
+			exit_status = EXIT_FAILURE;
+			break;
+		case SIEVE_EXEC_BIN_CORRUPT:
+			i_info("corrupt binary deleted.");
+			i_unlink_if_exists(sieve_binary_path(sbin));
+			/* fall through */
+		case SIEVE_EXEC_FAILURE:
+			i_info("final result: failed; "
+			       "resolved with successful implicit keep");
+			exit_status = EXIT_FAILURE;
+			break;
+		case SIEVE_EXEC_TEMP_FAILURE:
+			i_info("final result: temporary failure");
+			exit_status = EXIT_FAILURE;
+			break;
+		case SIEVE_EXEC_KEEP_FAILED:
+			i_info("final result: utter failure");
+			exit_status = EXIT_FAILURE;
+			break;
+		}
+
+		if (teststream != NULL)
+			o_stream_destroy(&teststream);
+		if (trace_log != NULL)
+			sieve_trace_log_free(&trace_log);
+
+		/* Cleanup remaining binaries */
+		if (sbin != NULL)
+			sieve_close(&sbin);
+		if (main_sbin != NULL)
+			sieve_close(&main_sbin);
+	}
+
+	/* Cleanup error handler */
+	sieve_error_handler_unref(&ehandler);
+
+	sieve_tool_deinit(&sieve_tool);
+
+	return exit_status;
+}
diff --git a/pigeonhole/src/sieve-tools/sievec.c b/pigeonhole/src/sieve-tools/sievec.c
new file mode 100644
index 0000000..d70435d
--- /dev/null
+++ b/pigeonhole/src/sieve-tools/sievec.c
@@ -0,0 +1,157 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "array.h"
+#include "master-service.h"
+#include "master-service-settings.h"
+#include "mail-storage-service.h"
+#include "mail-user.h"
+
+#include "sieve.h"
+#include "sieve-extensions.h"
+#include "sieve-script.h"
+#include "sieve-tool.h"
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <dirent.h>
+#include <sysexits.h>
+
+/*
+ * Print help
+ */
+
+static void print_help(void)
+{
+	printf(
+"Usage: sievec  [-c <config-file>] [-d] [-D] [-P <plugin>] [-x <extensions>] \n"
+"              <script-file> [<out-file>]\n"
+	);
+}
+
+/*
+ * Tool implementation
+ */
+
+int main(int argc, char **argv)
+{
+	struct sieve_instance *svinst;
+	struct stat st;
+	struct sieve_binary *sbin;
+	bool dump = FALSE;
+	const char *scriptfile, *outfile;
+	int exit_status = EXIT_SUCCESS;
+	int c;
+
+	sieve_tool = sieve_tool_init("sievec", &argc, &argv, "DdP:x:u:", FALSE);
+
+	outfile = NULL;
+	while ((c = sieve_tool_getopt(sieve_tool)) > 0) {
+		switch (c) {
+		case 'd':
+			/* dump file */
+			dump = TRUE;
+			break;
+		default:
+			print_help();
+			i_fatal_status(EX_USAGE, "Unknown argument: %c", c);
+			break;
+		}
+	}
+
+	if ( optind < argc ) {
+		scriptfile = argv[optind++];
+	} else {
+		print_help();
+		i_fatal_status(EX_USAGE, "Missing <script-file> argument");
+	}
+
+	if ( optind < argc ) {
+		outfile = argv[optind++];
+	} else if ( dump ) {
+		outfile = "-";
+	}
+
+	svinst = sieve_tool_init_finish(sieve_tool, FALSE, TRUE);
+
+	/* Enable debug extension */
+	sieve_enable_debug_extension(svinst);
+
+	if ( stat(scriptfile, &st) == 0 && S_ISDIR(st.st_mode) ) {
+		/* Script directory */
+		DIR *dirp;
+		struct dirent *dp;
+
+		/* Sanity checks on some of the arguments */
+
+		if ( dump )
+			i_fatal_status(EX_USAGE,
+				"the -d option is not allowed when scriptfile is a directory.");
+
+		if ( outfile != NULL )
+			i_fatal_status(EX_USAGE,
+				"the outfile argument is not allowed when scriptfile is a directory.");
+
+		/* Open the directory */
+		if ( (dirp = opendir(scriptfile)) == NULL )
+			i_fatal("opendir(%s) failed: %m", scriptfile);
+
+		/* Compile each sieve file */
+		for (;;) {
+
+			errno = 0;
+			if ( (dp = readdir(dirp)) == NULL ) {
+				if ( errno != 0 )
+					i_fatal("readdir(%s) failed: %m", scriptfile);
+				break;
+			}
+
+			if ( sieve_script_file_has_extension(dp->d_name) ) {
+				const char *file;
+
+				if ( scriptfile[strlen(scriptfile)-1] == '/' )
+					file = t_strconcat(scriptfile, dp->d_name, NULL);
+				else
+					file = t_strconcat(scriptfile, "/", dp->d_name, NULL);
+
+				sbin = sieve_tool_script_compile(svinst, file, NULL);
+
+				if ( sbin != NULL ) {
+					sieve_save(sbin, TRUE, NULL);
+					sieve_close(&sbin);
+				}
+			}
+		}
+
+		/* Close the directory */
+		if ( closedir(dirp) < 0 )
+			i_fatal("closedir(%s) failed: %m", scriptfile);
+	} else {
+		/* Script file (i.e. not a directory)
+		 *
+		 *   NOTE: For consistency, stat errors are handled here as well
+		 */
+		sbin = sieve_tool_script_compile(svinst, scriptfile, NULL);
+
+		if ( sbin != NULL ) {
+			if ( dump )
+				sieve_tool_dump_binary_to(sbin, outfile, FALSE);
+			else {	
+				sieve_save_as(sbin, outfile, TRUE, 0600, NULL);
+			}
+
+			sieve_close(&sbin);
+		} else {
+			exit_status = EXIT_FAILURE;
+		}
+	}
+
+	sieve_tool_deinit(&sieve_tool);
+
+	return exit_status;
+}
diff --git a/pigeonhole/src/testsuite/Makefile.am b/pigeonhole/src/testsuite/Makefile.am
new file mode 100644
index 0000000..f7b85dc
--- /dev/null
+++ b/pigeonhole/src/testsuite/Makefile.am
@@ -0,0 +1,74 @@
+noinst_PROGRAMS = testsuite
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib-sieve \
+	-I$(top_srcdir)/src/lib-sieve/util \
+	-I$(top_srcdir)/src/lib-sieve/plugins/variables \
+	-I$(top_srcdir)/src/lib-sieve-tool \
+	$(LIBDOVECOT_INCLUDE) \
+	$(LIBDOVECOT_SERVICE_INCLUDE)
+
+testsuite_LDFLAGS = -export-dynamic
+
+libs = \
+	$(top_builddir)/src/lib-sieve/libdovecot-sieve.la \
+	$(top_builddir)/src/lib-sieve-tool/libsieve-tool.la
+
+testsuite_LDADD = $(libs) $(LIBDOVECOT_STORAGE) $(LIBDOVECOT_LDA) $(LIBDOVECOT)
+testsuite_DEPENDENCIES = $(libs) $(LIBDOVECOT_STORAGE_DEPS) $(LIBDOVECOT_LDA_DEPS) $(LIBDOVECOT_DEPS)
+
+commands = \
+	cmd-test.c \
+	cmd-test-fail.c \
+	cmd-test-config.c \
+	cmd-test-set.c \
+	cmd-test-result.c \
+	cmd-test-message.c \
+	cmd-test-mailbox.c \
+	cmd-test-binary.c \
+	cmd-test-imap-metadata.c
+
+tests = \
+	tst-test-script-compile.c \
+	tst-test-script-run.c \
+	tst-test-multiscript.c \
+	tst-test-error.c \
+	tst-test-result-action.c \
+	tst-test-result-execute.c
+
+testsuite_SOURCES = \
+	testsuite-common.c \
+	testsuite-settings.c \
+	testsuite-objects.c \
+	testsuite-substitutions.c \
+	testsuite-variables.c \
+	testsuite-arguments.c \
+	testsuite-message.c \
+	testsuite-log.c \
+	testsuite-script.c \
+	testsuite-result.c \
+	testsuite-smtp.c \
+	testsuite-mailstore.c \
+	testsuite-binary.c \
+	$(commands) \
+	$(tests) \
+	ext-testsuite.c \
+	testsuite.c
+
+noinst_HEADERS = \
+	testsuite-common.h \
+	testsuite-settings.h \
+	testsuite-objects.h \
+	testsuite-substitutions.h \
+	testsuite-variables.h \
+	testsuite-arguments.h \
+	testsuite-message.h \
+	testsuite-log.h \
+	testsuite-script.h \
+	testsuite-result.h \
+	testsuite-smtp.h \
+	testsuite-mailstore.h \
+	testsuite-binary.h
+
+clean-local:
+	-rm -rf test.out.*
diff --git a/pigeonhole/src/testsuite/Makefile.in b/pigeonhole/src/testsuite/Makefile.in
new file mode 100644
index 0000000..1f9043f
--- /dev/null
+++ b/pigeonhole/src/testsuite/Makefile.in
@@ -0,0 +1,869 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
+am__make_running_with_option = \
+  case $${target_option-} in \
+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
+              "target option '$${target_option-}' specified" >&2; \
+         exit 1;; \
+  esac; \
+  has_opt=no; \
+  sane_makeflags=$$MAKEFLAGS; \
+  if $(am__is_gnu_make); then \
+    sane_makeflags=$$MFLAGS; \
+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
+        bs=\\; \
+        sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \
+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+  }; \
+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
+    case $$flg in \
+      *=*|--*) continue;; \
+        -*I) strip_trailopt 'I'; skip_next=yes;; \
+      -*I?*) strip_trailopt 'I';; \
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+      -*O?*) strip_trailopt 'O';; \
+        -*l) strip_trailopt 'l'; skip_next=yes;; \
+      -*l?*) strip_trailopt 'l';; \
+      -[dEDm]) skip_next=yes;; \
+      -[JT]) skip_next=yes;; \
+    esac; \
+    case $$flg in \
+      *$$target_option*) has_opt=yes; break;; \
+    esac; \
+  done; \
+  test $$has_opt = yes
+am__make_dryrun = (target_option=n; $(am__make_running_with_option))
+am__make_keepgoing = (target_option=k; $(am__make_running_with_option))
+pkgdatadir = $(datadir)/@PACKAGE@
+pkgincludedir = $(includedir)/@PACKAGE@
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+pkglibexecdir = $(libexecdir)/@PACKAGE@
+am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd
+install_sh_DATA = $(install_sh) -c -m 644
+install_sh_PROGRAM = $(install_sh) -c
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+INSTALL_HEADER = $(INSTALL_DATA)
+transform = $(program_transform_name)
+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
+PRE_UNINSTALL = :
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+subdir = src/testsuite
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+am__aclocal_m4_deps = $(top_srcdir)/m4/dovecot.m4 \
+	$(top_srcdir)/m4/libtool.m4 $(top_srcdir)/m4/ltoptions.m4 \
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+	$(top_srcdir)/m4/lt~obsolete.m4 $(top_srcdir)/configure.ac
+am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
+	$(ACLOCAL_M4)
+DIST_COMMON = $(srcdir)/Makefile.am $(noinst_HEADERS) \
+	$(am__DIST_COMMON)
+mkinstalldirs = $(install_sh) -d
+CONFIG_HEADER = $(top_builddir)/dummy-config.h \
+	$(top_builddir)/pigeonhole-config.h
+CONFIG_CLEAN_FILES =
+CONFIG_CLEAN_VPATH_FILES =
+PROGRAMS = $(noinst_PROGRAMS)
+am__objects_1 = cmd-test.$(OBJEXT) cmd-test-fail.$(OBJEXT) \
+	cmd-test-config.$(OBJEXT) cmd-test-set.$(OBJEXT) \
+	cmd-test-result.$(OBJEXT) cmd-test-message.$(OBJEXT) \
+	cmd-test-mailbox.$(OBJEXT) cmd-test-binary.$(OBJEXT) \
+	cmd-test-imap-metadata.$(OBJEXT)
+am__objects_2 = tst-test-script-compile.$(OBJEXT) \
+	tst-test-script-run.$(OBJEXT) tst-test-multiscript.$(OBJEXT) \
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+	fi
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+clean-local:
+	-rm -rf test.out.*
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+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/pigeonhole/src/testsuite/cmd-test-binary.c b/pigeonhole/src/testsuite/cmd-test-binary.c
new file mode 100644
index 0000000..6f810bd
--- /dev/null
+++ b/pigeonhole/src/testsuite/cmd-test-binary.c
@@ -0,0 +1,208 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+#include "sieve-dump.h"
+
+#include "testsuite-common.h"
+#include "testsuite-binary.h"
+#include "testsuite-script.h"
+
+/*
+ * Commands
+ */
+
+static bool cmd_test_binary_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool cmd_test_binary_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx);
+
+/* Test_binary_load command
+ *
+ * Syntax:
+ *   test_binary_load <binary-name: string>
+ */
+
+const struct sieve_command_def cmd_test_binary_load = {
+	.identifier = "test_binary_load",
+	.type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = cmd_test_binary_validate,
+	.generate = cmd_test_binary_generate
+};
+
+/* Test_binary_save command
+ *
+ * Syntax:
+ *   test_binary_save <binary-name: string>
+ */
+
+const struct sieve_command_def cmd_test_binary_save = {
+	.identifier = "test_binary_save",
+	.type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = cmd_test_binary_validate,
+	.generate = cmd_test_binary_generate,
+};
+
+/*
+ * Operations
+ */
+
+static bool cmd_test_binary_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int cmd_test_binary_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+/* test_binary_create operation */
+
+const struct sieve_operation_def test_binary_load_operation = {
+	.mnemonic = "TEST_BINARY_LOAD",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_BINARY_LOAD,
+	.dump = cmd_test_binary_operation_dump,
+	.execute = cmd_test_binary_operation_execute
+};
+
+/* test_binary_delete operation */
+
+const struct sieve_operation_def test_binary_save_operation = {
+	.mnemonic = "TEST_BINARY_SAVE",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_BINARY_SAVE,
+	.dump = cmd_test_binary_operation_dump,
+	.execute = cmd_test_binary_operation_execute
+};
+
+/*
+ * Validation
+ */
+
+static bool cmd_test_binary_validate
+(struct sieve_validator *valdtr, struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg = cmd->first_positional;
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, cmd, arg, "binary-name", 1, SAAT_STRING) ) {
+		return FALSE;
+	}
+
+	return sieve_validator_argument_activate(valdtr, cmd, arg, FALSE);
+}
+
+/*
+ * Code generation
+ */
+
+static bool cmd_test_binary_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	/* Emit operation */
+	if ( sieve_command_is(cmd, cmd_test_binary_load) )
+		sieve_operation_emit(cgenv->sblock, cmd->ext, &test_binary_load_operation);
+	else if ( sieve_command_is(cmd, cmd_test_binary_save) )
+		sieve_operation_emit(cgenv->sblock, cmd->ext, &test_binary_save_operation);
+	else
+		i_unreached();
+
+ 	/* Generate arguments */
+	if ( !sieve_generate_arguments(cgenv, cmd, NULL) )
+		return FALSE;
+
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool cmd_test_binary_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "%s:", sieve_operation_mnemonic(denv->oprtn));
+
+	sieve_code_descend(denv);
+
+	return sieve_opr_string_dump(denv, address, "binary-name");
+}
+
+/*
+ * Intepretation
+ */
+
+static int cmd_test_binary_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	const struct sieve_operation *oprtn = renv->oprtn;
+	string_t *binary_name = NULL;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Binary Name */
+
+	if ( (ret=sieve_opr_string_read(renv, address, "binary-name", &binary_name))
+		<= 0 )
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	if ( sieve_operation_is(oprtn, test_binary_load_operation) ) {
+		struct sieve_binary *sbin = testsuite_binary_load(str_c(binary_name));
+
+		if ( sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS) ) {
+			sieve_runtime_trace(renv, 0, "testsuite: test_binary_load command");
+			sieve_runtime_trace_descend(renv);
+			sieve_runtime_trace(renv, 0, "load binary `%s'", str_c(binary_name));
+		}
+
+		if ( sbin != NULL ) {
+			testsuite_script_set_binary(renv, sbin);
+
+			sieve_binary_unref(&sbin);
+		} else {
+			e_error(testsuite_sieve_instance->event,
+				"failed to load binary %s", str_c(binary_name));
+			return SIEVE_EXEC_FAILURE;
+		}
+
+	} else if ( sieve_operation_is(oprtn, test_binary_save_operation) ) {
+		struct sieve_binary *sbin = testsuite_script_get_binary(renv);
+
+		if ( sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS) ) {
+			sieve_runtime_trace(renv, 0, "testsuite: test_binary_save command");
+			sieve_runtime_trace_descend(renv);
+			sieve_runtime_trace(renv, 0, "save binary `%s'", str_c(binary_name));
+		}
+
+		if ( sbin != NULL )
+			testsuite_binary_save(sbin, str_c(binary_name));
+		else {
+			e_error(testsuite_sieve_instance->event,
+				"no compiled binary to save as %s",
+				str_c(binary_name));
+			return SIEVE_EXEC_FAILURE;
+		}
+	} else {
+		i_unreached();
+	}
+
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/testsuite/cmd-test-config.c b/pigeonhole/src/testsuite/cmd-test-config.c
new file mode 100644
index 0000000..c1399b0
--- /dev/null
+++ b/pigeonhole/src/testsuite/cmd-test-config.c
@@ -0,0 +1,504 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-settings.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+#include "sieve-dump.h"
+
+#include "testsuite-common.h"
+#include "testsuite-settings.h"
+
+/*
+ * Commands
+ */
+
+static bool
+cmd_test_config_generate(const struct sieve_codegen_env *cgenv,
+			 struct sieve_command *ctx);
+
+/* Test_config_set command
+ *
+ * Syntax:
+ *   test_config_set <setting: string> <value: string>
+ */
+
+static bool
+cmd_test_config_set_validate(struct sieve_validator *valdtr,
+			     struct sieve_command *cmd);
+
+const struct sieve_command_def cmd_test_config_set = {
+	.identifier = "test_config_set",
+	.type = SCT_COMMAND,
+	.positional_args = 2,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = cmd_test_config_set_validate,
+	.generate = cmd_test_config_generate
+};
+
+/* Test_config_unset command
+ *
+ * Syntax:
+ *   test_config_unset <setting: string>
+ */
+
+static bool
+cmd_test_config_unset_validate(struct sieve_validator *valdtr,
+			       struct sieve_command *cmd);
+
+const struct sieve_command_def cmd_test_config_unset = {
+	.identifier = "test_config_unset",
+	.type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = cmd_test_config_unset_validate,
+	.generate = cmd_test_config_generate,
+};
+
+/* Test_config_reload command
+ *
+ * Syntax:
+ *   test_config_reload [:extension <extension: string>]
+ */
+
+static bool
+cmd_test_config_reload_registered(struct sieve_validator *valdtr,
+				  const struct sieve_extension *ext,
+				  struct sieve_command_registration *cmd_reg);
+
+const struct sieve_command_def cmd_test_config_reload = {
+	.identifier = "test_config_reload",
+	.type = SCT_COMMAND,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = cmd_test_config_reload_registered,
+	.generate = cmd_test_config_generate
+};
+
+/*
+ * Command tags
+ */
+
+/* Forward declarations */
+
+static bool
+cmd_test_config_reload_validate_tag(struct sieve_validator *valdtr,
+				    struct sieve_ast_argument **arg,
+				    struct sieve_command *cmd);
+
+/* Argument objects */
+
+static const struct sieve_argument_def test_config_reload_extension_tag = {
+	.identifier = "extension",
+	.validate = cmd_test_config_reload_validate_tag,
+};
+
+/* Codes for optional arguments */
+
+enum cmd_test_config_optional {
+	OPT_END,
+	OPT_EXTENSION
+};
+
+/*
+ * Operations
+ */
+
+/* Test_config_set operation */
+
+static bool
+cmd_test_config_set_operation_dump(const struct sieve_dumptime_env *denv,
+				   sieve_size_t *address);
+static int
+cmd_test_config_set_operation_execute(const struct sieve_runtime_env *renv,
+				      sieve_size_t *address);
+
+const struct sieve_operation_def test_config_set_operation = {
+	.mnemonic = "TEST_CONFIG_SET",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_CONFIG_SET,
+	.dump = cmd_test_config_set_operation_dump,
+	.execute = cmd_test_config_set_operation_execute
+};
+
+/* Test_config_unset operation */
+
+static bool
+cmd_test_config_unset_operation_dump(const struct sieve_dumptime_env *denv,
+				     sieve_size_t *address);
+static int
+cmd_test_config_unset_operation_execute(const struct sieve_runtime_env *renv,
+					sieve_size_t *address);
+
+const struct sieve_operation_def test_config_unset_operation = {
+	.mnemonic = "TEST_CONFIG_UNSET",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_CONFIG_UNSET,
+	.dump = cmd_test_config_unset_operation_dump,
+	.execute = cmd_test_config_unset_operation_execute
+};
+
+/* Test_config_read operation */
+
+static bool
+cmd_test_config_reload_operation_dump(const struct sieve_dumptime_env *denv,
+				      sieve_size_t *address);
+static int
+cmd_test_config_reload_operation_execute(const struct sieve_runtime_env *renv,
+					 sieve_size_t *address);
+
+const struct sieve_operation_def test_config_reload_operation = {
+	.mnemonic = "TEST_CONFIG_RELOAD",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_CONFIG_RELOAD,
+	.dump = cmd_test_config_reload_operation_dump,
+	.execute = cmd_test_config_reload_operation_execute
+};
+
+/*
+ * Tag validation
+ */
+
+static bool
+cmd_test_config_reload_validate_tag(struct sieve_validator *valdtr,
+				    struct sieve_ast_argument **arg,
+				    struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+
+	/* Detach the tag itself */
+	*arg = sieve_ast_arguments_detach(*arg,1);
+
+	/* Check syntax:
+	 *   :extension <extension: string>
+	 */
+	if (!sieve_validate_tag_parameter(valdtr, cmd, tag, *arg, NULL, 0,
+					  SAAT_STRING, TRUE))
+		return FALSE;
+
+	/* Skip parameter */
+	*arg = sieve_ast_argument_next(*arg);
+
+	return TRUE;
+}
+
+/*
+ * Command registration
+ */
+
+static bool
+cmd_test_config_reload_registered(struct sieve_validator *valdtr,
+				  const struct sieve_extension *ext,
+				  struct sieve_command_registration *cmd_reg)
+{
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &test_config_reload_extension_tag,
+				     OPT_EXTENSION);
+	return TRUE;
+}
+
+/*
+ * Command validation
+ */
+
+static bool
+cmd_test_config_set_validate(struct sieve_validator *valdtr,
+			     struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg = cmd->first_positional;
+
+	/* Check syntax:
+	 *   <setting: string> <value: string>
+	 */
+
+	if (!sieve_validate_positional_argument(valdtr, cmd, arg, "setting",
+						1, SAAT_STRING))
+		return FALSE;
+
+	if (!sieve_validator_argument_activate(valdtr, cmd, arg, FALSE))
+		return FALSE;
+
+	arg = sieve_ast_argument_next(arg);
+
+	if (!sieve_validate_positional_argument(valdtr, cmd, arg, "value", 2,
+						SAAT_STRING))
+		return FALSE;
+
+	return sieve_validator_argument_activate(valdtr, cmd, arg, FALSE);
+}
+
+static bool
+cmd_test_config_unset_validate(struct sieve_validator *valdtr,
+			       struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg = cmd->first_positional;
+
+	/* Check syntax:
+	 *   <setting: string>
+	 */
+	if (!sieve_validate_positional_argument(valdtr, cmd, arg, "setting", 1,
+						SAAT_STRING))
+		return FALSE;
+
+	return sieve_validator_argument_activate(valdtr, cmd, arg, FALSE);
+}
+
+/*
+ * Code generation
+ */
+
+static bool
+cmd_test_config_generate(const struct sieve_codegen_env *cgenv,
+			 struct sieve_command *cmd)
+{
+	if (sieve_command_is(cmd, cmd_test_config_set)) {
+		sieve_operation_emit(cgenv->sblock, cmd->ext,
+				     &test_config_set_operation);
+	} else if (sieve_command_is(cmd, cmd_test_config_unset)) {
+		sieve_operation_emit(cgenv->sblock, cmd->ext,
+				     &test_config_unset_operation);
+	} else if (sieve_command_is(cmd, cmd_test_config_reload)) {
+		sieve_operation_emit(cgenv->sblock, cmd->ext,
+				     &test_config_reload_operation);
+	} else {
+		i_unreached();
+	}
+
+ 	/* Generate arguments */
+	if (!sieve_generate_arguments(cgenv, cmd, NULL))
+		return FALSE;
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+cmd_test_config_set_operation_dump(const struct sieve_dumptime_env *denv,
+				   sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "TEST_CONFIG_SET:");
+
+	sieve_code_descend(denv);
+
+	return (sieve_opr_string_dump(denv, address, "setting") &&
+		sieve_opr_string_dump(denv, address, "value"));
+}
+
+static bool
+cmd_test_config_unset_operation_dump(const struct sieve_dumptime_env *denv,
+				     sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "TEST_CONFIG_UNSET:");
+
+	sieve_code_descend(denv);
+
+	return sieve_opr_string_dump(denv, address, "setting");
+}
+
+static bool
+cmd_test_config_reload_operation_dump(const struct sieve_dumptime_env *denv,
+				      sieve_size_t *address)
+{
+	int opt_code = 0;
+
+	sieve_code_dumpf(denv, "TEST_CONFIG_RELOAD:");
+	sieve_code_descend(denv);
+
+	/* Dump optional operands */
+
+	for (;;) {
+		int opt;
+		bool opok = TRUE;
+
+		if ((opt = sieve_opr_optional_dump(denv, address,
+						   &opt_code)) < 0)
+			return FALSE;
+
+		if (opt == 0)
+			break;
+
+		switch (opt_code) {
+		case OPT_EXTENSION:
+			opok = sieve_opr_string_dump(denv, address,
+						     "extensions");
+			break;
+		default:
+			opok = FALSE;
+			break;
+		}
+
+		if (!opok)
+			return FALSE;
+	}
+
+	return TRUE;
+}
+
+/*
+ * Interpretation
+ */
+
+static int
+cmd_test_config_set_operation_execute(const struct sieve_runtime_env *renv,
+				      sieve_size_t *address)
+{
+	string_t *setting;
+	string_t *value;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Setting */
+	if ((ret = sieve_opr_string_read(renv, address, "setting",
+					 &setting)) <= 0)
+		return ret;
+
+	/* Value */
+	if ((ret = sieve_opr_string_read(renv, address, "value",
+					 &value)) <= 0)
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS)) {
+		sieve_runtime_trace(
+			renv, 0, "testsuite: test_config_set command");
+		sieve_runtime_trace_descend(renv);
+		sieve_runtime_trace(
+			renv, 0, "set config `%s' = `%s'",
+			str_c(setting), str_c(value));
+	}
+
+	testsuite_setting_set(str_c(setting), str_c(value));
+
+	return SIEVE_EXEC_OK;
+}
+
+static int
+cmd_test_config_unset_operation_execute(const struct sieve_runtime_env *renv,
+					sieve_size_t *address)
+{
+	string_t *setting;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Setting */
+	if ((ret = sieve_opr_string_read(renv, address, "setting",
+					 &setting)) <= 0)
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS)) {
+		sieve_runtime_trace(
+			renv, 0, "testsuite: test_config_unset command");
+		sieve_runtime_trace_descend(renv);
+		sieve_runtime_trace(
+			renv, 0, "unset config `%s'", str_c(setting));
+	}
+
+	testsuite_setting_unset(str_c(setting));
+
+	return SIEVE_EXEC_OK;
+}
+
+static int
+cmd_test_config_reload_operation_execute(const struct sieve_runtime_env *renv,
+					 sieve_size_t *address)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	const struct sieve_extension *ext;
+	int opt_code = 0;
+	string_t *extension = NULL;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Optional operands */
+	for (;;) {
+		int opt;
+
+		if ((opt = sieve_opr_optional_read(renv, address,
+						   &opt_code)) < 0)
+			return SIEVE_EXEC_BIN_CORRUPT;
+
+		if (opt == 0)
+			break;
+
+		switch (opt_code) {
+		case OPT_EXTENSION:
+			ret = sieve_opr_string_read(renv, address, "extension",
+						    &extension);
+			break;
+		default:
+			sieve_runtime_trace_error(
+				renv, "unknown optional operand");
+			ret = SIEVE_EXEC_BIN_CORRUPT;
+		}
+
+		if (ret <= 0)
+			return ret;
+	}
+
+	/*
+	 * Perform operation
+	 */
+
+	if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS)) {
+		sieve_runtime_trace(
+			renv, 0, "testsuite: test_config_reload command");
+		sieve_runtime_trace_descend(renv);
+	}
+
+	if (extension == NULL) {
+		if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS)) {
+			sieve_runtime_trace(
+				renv, 0,
+				"reload configuration for sieve engine");
+		}
+
+		sieve_settings_load(eenv->svinst);
+	} else {
+		if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS)) {
+			sieve_runtime_trace(
+				renv, 0,
+				"reload configuration for extension `%s'",
+				str_c(extension));
+		}
+
+		ext = sieve_extension_get_by_name(eenv->svinst,
+						  str_c(extension));
+		if (ext == NULL) {
+			return testsuite_test_failf(
+				renv, "test_config_reload: "
+				"unknown extension '%s'", str_c(extension));
+		}
+		sieve_extension_reload(ext);
+	}
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/testsuite/cmd-test-fail.c b/pigeonhole/src/testsuite/cmd-test-fail.c
new file mode 100644
index 0000000..346c187
--- /dev/null
+++ b/pigeonhole/src/testsuite/cmd-test-fail.c
@@ -0,0 +1,129 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+#include "sieve-dump.h"
+
+#include "testsuite-common.h"
+
+/*
+ * Test_fail command
+ *
+ * Syntax:
+ *   test_fail <reason: string>
+ */
+
+static bool
+cmd_test_fail_validate(struct sieve_validator *valdtr,
+		       struct sieve_command *cmd);
+static bool
+cmd_test_fail_generate(const struct sieve_codegen_env *cgenv,
+		       struct sieve_command *ctx);
+
+const struct sieve_command_def cmd_test_fail = {
+	.identifier = "test_fail",
+	.type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = cmd_test_fail_validate,
+	.generate = cmd_test_fail_generate,
+};
+
+/*
+ * Test operation
+ */
+
+static bool
+cmd_test_fail_operation_dump(const struct sieve_dumptime_env *denv,
+			     sieve_size_t *address);
+static int
+cmd_test_fail_operation_execute(const struct sieve_runtime_env *renv,
+				sieve_size_t *address);
+
+const struct sieve_operation_def test_fail_operation = {
+	.mnemonic = "TEST_FAIL",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_FAIL,
+	.dump = cmd_test_fail_operation_dump,
+	.execute = cmd_test_fail_operation_execute,
+};
+
+/*
+ * Validation
+ */
+
+static bool
+cmd_test_fail_validate(struct sieve_validator *valdtr ATTR_UNUSED,
+		       struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg = cmd->first_positional;
+
+	if (!sieve_validate_positional_argument(valdtr, cmd, arg, "reason", 1,
+						SAAT_STRING))
+		return FALSE;
+
+	return sieve_validator_argument_activate(valdtr, cmd, arg, FALSE);
+}
+
+/*
+ * Code generation
+ */
+
+static bool
+cmd_test_fail_generate(const struct sieve_codegen_env *cgenv,
+		       struct sieve_command *cmd)
+{
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &test_fail_operation);
+
+	/* Generate arguments */
+	if (!sieve_generate_arguments(cgenv, cmd, NULL))
+		return FALSE;
+
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+cmd_test_fail_operation_dump(const struct sieve_dumptime_env *denv,
+			     sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "TEST_FAIL:");
+	sieve_code_descend(denv);
+
+	if (!sieve_opr_string_dump(denv, address, "reason"))
+		return FALSE;
+
+	return TRUE;
+}
+
+/*
+ * Intepretation
+ */
+
+static int
+cmd_test_fail_operation_execute(const struct sieve_runtime_env *renv,
+				sieve_size_t *address)
+{
+	string_t *reason;
+	int ret;
+
+	ret = sieve_opr_string_read(renv, address, "reason", &reason);
+	if (ret <= 0)
+		return ret;
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS, "testsuite: "
+			    "test_fail command; FAIL current test");
+
+	return testsuite_test_fail(renv, reason);
+}
diff --git a/pigeonhole/src/testsuite/cmd-test-imap-metadata.c b/pigeonhole/src/testsuite/cmd-test-imap-metadata.c
new file mode 100644
index 0000000..1c5e2a9
--- /dev/null
+++ b/pigeonhole/src/testsuite/cmd-test-imap-metadata.c
@@ -0,0 +1,284 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+#include "sieve-dump.h"
+
+#include "testsuite-common.h"
+#include "testsuite-mailstore.h"
+
+/*
+ * Commands
+ */
+
+static bool cmd_test_imap_metadata_registered
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+static bool cmd_test_imap_metadata_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool cmd_test_imap_metadata_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx);
+
+/* Test_mailbox_create command
+ *
+ * Syntax:
+ *   test_imap_metadata_set
+ *     <mailbox: string> <annotation: string> <value:string>
+ */
+
+const struct sieve_command_def cmd_test_imap_metadata_set = {
+	.identifier = "test_imap_metadata_set",
+	.type = SCT_COMMAND,
+	.positional_args = 2,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = cmd_test_imap_metadata_registered,
+	.validate = cmd_test_imap_metadata_validate,
+	.generate = cmd_test_imap_metadata_generate,
+};
+
+/*
+ * Command tags
+ */
+
+static bool cmd_test_imap_metadata_validate_mailbox_tag
+	(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *cmd);
+
+static const struct sieve_argument_def test_imap_metadata_mailbox_tag = {
+	.identifier = "mailbox",
+	.validate = cmd_test_imap_metadata_validate_mailbox_tag
+};
+
+/*
+ * Operations
+ */
+
+static bool cmd_test_imap_metadata_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int cmd_test_imap_metadata_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+/* Test_mailbox_create operation */
+
+const struct sieve_operation_def test_imap_metadata_set_operation = {
+	.mnemonic = "TEST_IMAP_METADATA_SET",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_IMAP_METADATA_SET,
+	.dump = cmd_test_imap_metadata_operation_dump,
+	.execute = cmd_test_imap_metadata_operation_execute
+};
+
+/* Codes for optional arguments */
+
+enum cmd_vacation_optional {
+	OPT_END,
+	OPT_MAILBOX
+};
+
+/*
+ * Tag validation
+ */
+
+static bool cmd_test_imap_metadata_validate_mailbox_tag
+(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+	struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+
+	/* Delete this tag */
+	*arg = sieve_ast_arguments_detach(*arg, 1);
+
+	/* Check syntax:
+	 *   :mailbox string
+	 */
+	if ( !sieve_validate_tag_parameter
+		(valdtr, cmd, tag, *arg, NULL, 0, SAAT_STRING, FALSE) ) {
+		return FALSE;
+	}
+
+	/* Skip parameter */
+	*arg = sieve_ast_argument_next(*arg);
+	return TRUE;
+}
+
+/*
+ * Command registration
+ */
+
+static bool cmd_test_imap_metadata_registered
+(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+	struct sieve_command_registration *cmd_reg)
+{
+	sieve_validator_register_tag
+		(valdtr, cmd_reg, ext, &test_imap_metadata_mailbox_tag, OPT_MAILBOX);
+	return TRUE;
+}
+
+
+/*
+ * Validation
+ */
+
+static bool cmd_test_imap_metadata_validate
+(struct sieve_validator *valdtr, struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg = cmd->first_positional;
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, cmd, arg, "annotation", 2, SAAT_STRING) )
+		return FALSE;
+
+	if (!sieve_validator_argument_activate(valdtr, cmd, arg, FALSE))
+		return FALSE;
+
+	arg = sieve_ast_argument_next(arg);
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, cmd, arg, "value", 3, SAAT_STRING) )
+		return FALSE;
+
+	if (!sieve_validator_argument_activate(valdtr, cmd, arg, FALSE))
+		return FALSE;
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool cmd_test_imap_metadata_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	/* Emit operation */
+	if ( sieve_command_is(cmd, cmd_test_imap_metadata_set) )
+		sieve_operation_emit
+			(cgenv->sblock, cmd->ext, &test_imap_metadata_set_operation);
+	else
+		i_unreached();
+
+ 	/* Generate arguments */
+	if ( !sieve_generate_arguments(cgenv, cmd, NULL) )
+		return FALSE;
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool cmd_test_imap_metadata_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	int opt_code = 0;
+
+	sieve_code_dumpf(denv, "%s:", sieve_operation_mnemonic(denv->oprtn));
+	sieve_code_descend(denv);
+
+	/* Dump optional operands */
+
+	for (;;) {
+		int opt;
+		bool opok = TRUE;
+
+		if ( (opt=sieve_opr_optional_dump(denv, address, &opt_code)) < 0 )
+			return FALSE;
+
+		if ( opt == 0 ) break;
+
+		switch ( opt_code ) {
+		case OPT_MAILBOX:
+			opok = sieve_opr_string_dump(denv, address, "mailbox");
+			break;
+		default:
+			return FALSE;
+		}
+
+		if ( !opok ) return FALSE;
+	}	
+
+	return 
+		( sieve_opr_string_dump(denv, address, "annotation") &&
+			sieve_opr_string_dump(denv, address, "value") );
+}
+
+/*
+ * Intepretation
+ */
+
+static int cmd_test_imap_metadata_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	const struct sieve_operation *oprtn = renv->oprtn;
+	int opt_code = 0;
+	string_t *mailbox = NULL, *annotation = NULL, *value = NULL;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Optional operands */
+
+	for (;;) {
+		int opt;
+
+		if ( (opt=sieve_opr_optional_read(renv, address, &opt_code)) < 0 )
+			return SIEVE_EXEC_BIN_CORRUPT;
+
+		if ( opt == 0 ) break;
+
+		switch ( opt_code ) {
+		case OPT_MAILBOX:
+			ret = sieve_opr_string_read(renv, address, "mailbox", &mailbox);
+			break;
+		default:
+			sieve_runtime_trace_error(renv, "unknown optional operand");
+			ret = SIEVE_EXEC_BIN_CORRUPT;
+		}
+
+		if ( ret <= 0 ) return ret;
+	}
+
+	/* Fixed operands */
+
+	if ( (ret=sieve_opr_string_read
+		(renv, address, "annotation", &annotation)) <= 0 )
+		return ret;
+	if ( (ret=sieve_opr_string_read
+		(renv, address, "value", &value)) <= 0 )
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	if ( sieve_operation_is(oprtn, test_imap_metadata_set_operation) ) {
+		if ( sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS) ) {
+			sieve_runtime_trace(renv, 0, "testsuite/test_imap_metadata_set command");
+			sieve_runtime_trace_descend(renv);
+			if (mailbox == NULL) {
+				sieve_runtime_trace(renv, 0,
+					"set server annotation `%s'", str_c(annotation));
+			} else {
+				sieve_runtime_trace(renv, 0,
+					"set annotation `%s' for mailbox `%s'",
+					str_c(annotation), str_c(mailbox));
+			}
+		}
+
+		if (testsuite_mailstore_set_imap_metadata
+			(( mailbox == NULL ? NULL : str_c(mailbox) ),
+				str_c(annotation), str_c(value)) < 0)
+			return SIEVE_EXEC_FAILURE;
+	}
+
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/testsuite/cmd-test-mailbox.c b/pigeonhole/src/testsuite/cmd-test-mailbox.c
new file mode 100644
index 0000000..b5d946c
--- /dev/null
+++ b/pigeonhole/src/testsuite/cmd-test-mailbox.c
@@ -0,0 +1,261 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+#include "sieve-dump.h"
+#include "sieve-actions.h"
+
+#include "testsuite-common.h"
+#include "testsuite-mailstore.h"
+
+/*
+ * Commands
+ */
+
+static bool
+cmd_test_mailbox_validate(struct sieve_validator *valdtr,
+			  struct sieve_command *cmd);
+static bool
+cmd_test_mailbox_generate(const struct sieve_codegen_env *cgenv,
+			  struct sieve_command *ctx);
+
+/* Test_mailbox_create command
+ *
+ * Syntax:
+ *   test_mailbox_create <mailbox: string>
+ */
+
+const struct sieve_command_def cmd_test_mailbox_create = {
+	.identifier = "test_mailbox_create",
+	.type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = cmd_test_mailbox_validate,
+	.generate = cmd_test_mailbox_generate,
+};
+
+/* Test_mailbox_delete command
+ *
+ * Syntax:
+ *   test_mailbox_create <mailbox: string>
+ */
+
+const struct sieve_command_def cmd_test_mailbox_delete = {
+	.identifier = "test_mailbox_delete",
+	.type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = cmd_test_mailbox_validate,
+	.generate = cmd_test_mailbox_generate,
+};
+
+/*
+ * Operations
+ */
+
+static bool
+cmd_test_mailbox_operation_dump(const struct sieve_dumptime_env *denv,
+				sieve_size_t *address);
+static int
+cmd_test_mailbox_operation_execute(const struct sieve_runtime_env *renv,
+				   sieve_size_t *address);
+
+/* Test_mailbox_create operation */
+
+const struct sieve_operation_def test_mailbox_create_operation = {
+	.mnemonic = "TEST_MAILBOX_CREATE",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_MAILBOX_CREATE,
+	.dump = cmd_test_mailbox_operation_dump,
+	.execute = cmd_test_mailbox_operation_execute,
+};
+
+/* Test_mailbox_delete operation */
+
+const struct sieve_operation_def test_mailbox_delete_operation = {
+	.mnemonic = "TEST_MAILBOX_DELETE",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_MAILBOX_DELETE,
+	.dump = cmd_test_mailbox_operation_dump,
+	.execute = cmd_test_mailbox_operation_execute,
+};
+
+/*
+ * Validation
+ */
+
+static bool
+cmd_test_mailbox_validate(struct sieve_validator *valdtr,
+			  struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg = cmd->first_positional;
+
+	if (!sieve_validate_positional_argument(valdtr, cmd, arg, "mailbox", 1,
+						SAAT_STRING))
+		return FALSE;
+
+	if ( !sieve_validator_argument_activate(valdtr, cmd, arg, FALSE) )
+		return FALSE;
+
+	/* Check name validity when folder argument is not a variable */
+	if ( sieve_argument_is_string_literal(arg) ) {
+		const char *folder = sieve_ast_argument_strc(arg), *error;
+
+		if ( !sieve_mailbox_check_name(folder, &error) ) {
+			sieve_command_validate_error(
+				valdtr, cmd, "%s command: "
+				"invalid mailbox `%s' specified: %s",
+				sieve_command_identifier(cmd),
+				str_sanitize(folder, 256), error);
+			return FALSE;
+		}
+	}
+
+	return TRUE;
+}
+
+/*
+ * Code generation
+ */
+
+static bool
+cmd_test_mailbox_generate(const struct sieve_codegen_env *cgenv,
+			  struct sieve_command *cmd)
+{
+	/* Emit operation */
+	if (sieve_command_is(cmd, cmd_test_mailbox_create)) {
+		sieve_operation_emit(cgenv->sblock, cmd->ext,
+				     &test_mailbox_create_operation);
+	} else if (sieve_command_is(cmd, cmd_test_mailbox_delete)) {
+		sieve_operation_emit(cgenv->sblock, cmd->ext,
+				     &test_mailbox_delete_operation);
+	} else {
+		i_unreached();
+	}
+
+ 	/* Generate arguments */
+	if (!sieve_generate_arguments(cgenv, cmd, NULL))
+		return FALSE;
+
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+cmd_test_mailbox_operation_dump(const struct sieve_dumptime_env *denv,
+				sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "%s:", sieve_operation_mnemonic(denv->oprtn));
+
+	sieve_code_descend(denv);
+
+	return sieve_opr_string_dump(denv, address, "mailbox");
+}
+
+/*
+ * Intepretation
+ */
+
+static const char *
+cmd_test_mailbox_get_command_name(const struct sieve_operation *oprtn)
+{
+	if (sieve_operation_is(oprtn, test_mailbox_create_operation))
+		return "test_mailbox_create";
+	if (sieve_operation_is(oprtn, test_mailbox_delete_operation))
+		return "test_mailbox_delete";
+
+	i_unreached();
+}
+
+static int
+cmd_test_mailbox_create_execute(const struct sieve_runtime_env *renv,
+				const char *mailbox)
+{
+	if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS)) {
+		sieve_runtime_trace(
+			renv, 0,
+			"testsuite/test_mailbox_create command");
+		sieve_runtime_trace_descend(renv);
+		sieve_runtime_trace(
+			renv, 0, "create mailbox `%s'", mailbox);
+	}
+
+	testsuite_mailstore_mailbox_create(renv, mailbox);
+	return SIEVE_EXEC_OK;
+}
+
+static int
+cmd_test_mailbox_delete_execute(const struct sieve_runtime_env *renv,
+				const char *mailbox)
+{
+	if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS)) {
+		sieve_runtime_trace(
+			renv, 0,
+			"testsuite/test_mailbox_delete command");
+		sieve_runtime_trace_descend(renv);
+		sieve_runtime_trace(
+			renv, 0, "delete mailbox `%s'", mailbox);
+	}
+
+	/* FIXME: implement */
+	return testsuite_test_failf(
+		renv, "test_mailbox_delete: NOT IMPLEMENTED");
+}
+
+static int
+cmd_test_mailbox_operation_execute(const struct sieve_runtime_env *renv,
+				   sieve_size_t *address)
+{
+	const struct sieve_operation *oprtn = renv->oprtn;
+	string_t *mailbox = NULL;
+	const char *error;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Mailbox */
+
+	ret = sieve_opr_string_read(renv, address, "mailbox", &mailbox);
+	if (ret <= 0)
+		return ret;
+
+	if (!sieve_mailbox_check_name(str_c(mailbox), &error)) {
+		sieve_runtime_error(
+			renv, NULL, "%s command: "
+			"invalid mailbox `%s' specified: %s",
+			cmd_test_mailbox_get_command_name(oprtn),
+			str_c(mailbox), error);
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	/*
+	 * Perform operation
+	 */
+
+	if (sieve_operation_is(oprtn, test_mailbox_create_operation))
+		ret = cmd_test_mailbox_create_execute(renv, str_c(mailbox));
+	else if (sieve_operation_is(oprtn, test_mailbox_delete_operation))
+		ret = cmd_test_mailbox_delete_execute(renv, str_c(mailbox));
+	else
+		i_unreached();
+
+	return ret;
+}
diff --git a/pigeonhole/src/testsuite/cmd-test-message.c b/pigeonhole/src/testsuite/cmd-test-message.c
new file mode 100644
index 0000000..ff36704
--- /dev/null
+++ b/pigeonhole/src/testsuite/cmd-test-message.c
@@ -0,0 +1,569 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str-sanitize.h"
+#include "istream.h"
+#include "mail-storage.h"
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-message.h"
+#include "sieve-actions.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+#include "sieve-dump.h"
+
+#include "testsuite-common.h"
+#include "testsuite-smtp.h"
+#include "testsuite-mailstore.h"
+
+/*
+ * Commands
+ */
+
+/* Test_message command
+ *
+ * Syntax:
+ *   test_message ( :smtp / :mailbox <mailbox: string> ) <index: number>
+ */
+
+static bool
+cmd_test_message_registered(struct sieve_validator *valdtr,
+			    const struct sieve_extension *ext,
+			    struct sieve_command_registration *cmd_reg);
+static bool
+cmd_test_message_validate(struct sieve_validator *valdtr,
+			  struct sieve_command *cmd);
+static bool
+cmd_test_message_generate(const struct sieve_codegen_env *cgenv,
+			  struct sieve_command *ctx);
+
+const struct sieve_command_def cmd_test_message = {
+	.identifier = "test_message",
+	.type = SCT_HYBRID,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = cmd_test_message_registered,
+	.validate = cmd_test_message_validate,
+	.generate = cmd_test_message_generate,
+};
+
+/* Test_message_print command
+ *
+ * Syntax:
+ *   test_message_print
+ */
+
+static bool
+cmd_test_message_print_generate(const struct sieve_codegen_env *cgenv,
+				struct sieve_command *cmd);
+
+const struct sieve_command_def cmd_test_message_print = {
+	.identifier = "test_message_print",
+	.type = SCT_COMMAND,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.generate = cmd_test_message_print_generate,
+};
+
+/*
+ * Operations
+ */
+
+/* Test_message_smtp operation */
+
+static bool
+cmd_test_message_smtp_operation_dump(const struct sieve_dumptime_env *denv,
+				     sieve_size_t *address);
+static int
+cmd_test_message_smtp_operation_execute(const struct sieve_runtime_env *renv,
+					sieve_size_t *address);
+
+const struct sieve_operation_def test_message_smtp_operation = {
+	.mnemonic = "TEST_MESSAGE_SMTP",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_MESSAGE_SMTP,
+	.dump = cmd_test_message_smtp_operation_dump,
+	.execute = cmd_test_message_smtp_operation_execute,
+};
+
+/* Test_message_mailbox operation */
+
+static bool
+cmd_test_message_mailbox_operation_dump(const struct sieve_dumptime_env *denv,
+					sieve_size_t *address);
+static int
+cmd_test_message_mailbox_operation_execute(const struct sieve_runtime_env *renv,
+					   sieve_size_t *address);
+
+const struct sieve_operation_def test_message_mailbox_operation = {
+	.mnemonic = "TEST_MESSAGE_MAILBOX",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_MESSAGE_MAILBOX,
+	.dump = cmd_test_message_mailbox_operation_dump,
+	.execute = cmd_test_message_mailbox_operation_execute,
+};
+
+/* Test_message_print operation */
+
+static bool
+cmd_test_message_print_operation_dump(const struct sieve_dumptime_env *denv,
+				      sieve_size_t *address);
+static int
+cmd_test_message_print_operation_execute(const struct sieve_runtime_env *renv,
+					 sieve_size_t *address);
+
+const struct sieve_operation_def test_message_print_operation = {
+	.mnemonic = "TEST_MESSAGE_PRINT",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_MESSAGE_PRINT,
+	.dump = cmd_test_message_print_operation_dump,
+	.execute = cmd_test_message_print_operation_execute,
+};
+
+/*
+ * Compiler context data
+ */
+
+enum test_message_source {
+	MSG_SOURCE_SMTP,
+	MSG_SOURCE_MAILBOX,
+	MSG_SOURCE_LAST,
+};
+
+const struct sieve_operation_def *test_message_operations[] = {
+	&test_message_smtp_operation,
+	&test_message_mailbox_operation,
+};
+
+struct cmd_test_message_context_data {
+	enum test_message_source msg_source;
+	const char *folder;
+};
+
+#define CMD_TEST_MESSAGE_ERROR_DUP_TAG \
+	"exactly one of the ':smtp' or ':folder' tags must be specified " \
+	"for the test_message command, but more were found"
+
+/*
+ * Command tags
+ */
+
+static bool
+cmd_test_message_validate_smtp_tag(struct sieve_validator *valdtr,
+				   struct sieve_ast_argument **arg,
+				   struct sieve_command *cmd);
+static bool
+cmd_test_message_validate_folder_tag(struct sieve_validator *valdtr,
+				     struct sieve_ast_argument **arg,
+				     struct sieve_command *cmd);
+
+static const struct sieve_argument_def test_message_smtp_tag = {
+	.identifier = "smtp",
+	.validate = cmd_test_message_validate_smtp_tag,
+};
+
+static const struct sieve_argument_def test_message_folder_tag = {
+	.identifier = "folder",
+	.validate = cmd_test_message_validate_folder_tag,
+};
+
+static bool
+cmd_test_message_registered(struct sieve_validator *valdtr,
+			    const struct sieve_extension *ext,
+			    struct sieve_command_registration *cmd_reg)
+{
+	/* Register our tags */
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &test_message_folder_tag, 0);
+	sieve_validator_register_tag(valdtr, cmd_reg, ext,
+				     &test_message_smtp_tag, 0);
+	return TRUE;
+}
+
+static struct cmd_test_message_context_data *
+cmd_test_message_validate_tag(struct sieve_validator *valdtr,
+			      struct sieve_ast_argument **arg,
+			      struct sieve_command *cmd)
+{
+	struct cmd_test_message_context_data *ctx_data =
+		(struct cmd_test_message_context_data *)cmd->data;
+
+	if (ctx_data != NULL) {
+		sieve_argument_validate_error(valdtr, *arg,
+					      CMD_TEST_MESSAGE_ERROR_DUP_TAG);
+		return NULL;
+	}
+
+	ctx_data = p_new(sieve_command_pool(cmd),
+			 struct cmd_test_message_context_data, 1);
+	cmd->data = ctx_data;
+
+	/* Delete this tag */
+	*arg = sieve_ast_arguments_detach(*arg, 1);
+
+	return ctx_data;
+}
+
+static bool
+cmd_test_message_validate_smtp_tag(struct sieve_validator *valdtr,
+				   struct sieve_ast_argument **arg,
+				   struct sieve_command *cmd)
+{
+	struct cmd_test_message_context_data *ctx_data =
+		cmd_test_message_validate_tag(valdtr, arg, cmd);
+
+	/* Return value is NULL on error */
+	if (ctx_data == NULL)
+		return FALSE;
+
+	/* Assign chosen message source */
+	ctx_data->msg_source = MSG_SOURCE_SMTP;
+
+	return TRUE;
+}
+
+static bool
+cmd_test_message_validate_folder_tag(struct sieve_validator *valdtr,
+				     struct sieve_ast_argument **arg,
+				     struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+	struct cmd_test_message_context_data *ctx_data =
+		cmd_test_message_validate_tag(valdtr, arg, cmd);
+
+	/* Return value is NULL on error */
+	if (ctx_data == NULL)
+		return FALSE;
+
+	/* Assign chose message source */
+	ctx_data->msg_source = MSG_SOURCE_MAILBOX;
+
+	/* Check syntax:
+	 *   :folder string
+	 */
+	if (!sieve_validate_tag_parameter(valdtr, cmd, tag, *arg, NULL, 0,
+					  SAAT_STRING, FALSE)) {
+		return FALSE;
+	}
+
+	/* Check name validity when folder argument is not a variable */
+	if ( sieve_argument_is_string_literal(*arg) ) {
+		const char *folder = sieve_ast_argument_strc(*arg), *error;
+
+		if ( !sieve_mailbox_check_name(folder, &error) ) {
+			sieve_command_validate_error(
+				valdtr, cmd, "%s command: "
+				"invalid mailbox `%s' specified: %s",
+				sieve_command_identifier(cmd),
+				str_sanitize(folder, 256), error);
+			return FALSE;
+		}
+	}
+
+	/* Skip parameter */
+	*arg = sieve_ast_argument_next(*arg);
+
+	return TRUE;
+}
+
+/*
+ * Validation
+ */
+
+static bool
+cmd_test_message_validate(struct sieve_validator *valdtr,
+			  struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg = cmd->first_positional;
+
+	if (cmd->data == NULL) {
+		sieve_command_validate_error(
+			valdtr, cmd,
+			"the test_message command requires either "
+			"the :smtp or the :mailbox tag to be specified");
+		return FALSE;
+	}
+
+	if (!sieve_validate_positional_argument(valdtr, cmd, arg, "index", 1,
+						SAAT_NUMBER))
+		return FALSE;
+
+	return sieve_validator_argument_activate(valdtr, cmd, arg, FALSE);
+}
+
+/*
+ * Code generation
+ */
+
+static bool
+cmd_test_message_generate(const struct sieve_codegen_env *cgenv,
+			  struct sieve_command *cmd)
+{
+	struct cmd_test_message_context_data *ctx_data =
+		(struct cmd_test_message_context_data *)cmd->data;
+
+	i_assert(ctx_data->msg_source < MSG_SOURCE_LAST);
+
+	/* Emit operation */
+	sieve_operation_emit(cgenv->sblock, cmd->ext,
+			     test_message_operations[ctx_data->msg_source]);
+
+	/* Emit is_test flag */
+	sieve_binary_emit_byte(cgenv->sblock,
+			       (cmd->ast_node->type == SAT_TEST ? 1 : 0));
+
+ 	/* Generate arguments */
+	if (!sieve_generate_arguments(cgenv, cmd, NULL))
+		return FALSE;
+
+	return TRUE;
+}
+
+static bool
+cmd_test_message_print_generate(const struct sieve_codegen_env *cgenv,
+				struct sieve_command *cmd)
+{
+	/* Emit operation */
+	sieve_operation_emit(cgenv->sblock, cmd->ext,
+			     &test_message_print_operation);
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+cmd_test_message_smtp_operation_dump(const struct sieve_dumptime_env *denv,
+				     sieve_size_t *address)
+{
+	unsigned int is_test;
+
+	if (!sieve_binary_read_byte(denv->sblock, address, &is_test))
+		return FALSE;
+
+	sieve_code_dumpf(denv, "TEST_MESSAGE_SMTP (%s):",
+			 (is_test > 0 ? "TEST" : "COMMAND"));
+
+	sieve_code_descend(denv);
+
+	return sieve_opr_number_dump(denv, address, "index");
+}
+
+static bool
+cmd_test_message_mailbox_operation_dump(const struct sieve_dumptime_env *denv,
+					sieve_size_t *address)
+{
+	unsigned int is_test;
+
+	if (!sieve_binary_read_byte(denv->sblock, address, &is_test))
+		return FALSE;
+
+	sieve_code_dumpf(denv, "TEST_MESSAGE_MAILBOX (%s):",
+			 (is_test > 0 ? "TEST" : "COMMAND"));
+
+	sieve_code_descend(denv);
+
+	return (sieve_opr_string_dump(denv, address, "folder") &&
+		sieve_opr_number_dump(denv, address, "index"));
+}
+
+static bool
+cmd_test_message_print_operation_dump(const struct sieve_dumptime_env *denv,
+				      sieve_size_t *address ATTR_UNUSED)
+{
+	sieve_code_dumpf(denv, "TEST_MESSAGE_PRINT");
+
+	return TRUE;
+}
+
+/*
+ * Intepretation
+ */
+
+static int
+cmd_test_message_smtp_operation_execute(const struct sieve_runtime_env *renv,
+					sieve_size_t *address)
+{
+	sieve_number_t msg_index;
+	unsigned int is_test = 0;
+	bool result;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Is test */
+
+	if (!sieve_binary_read_byte(renv->sblock, address, &is_test)) {
+		sieve_runtime_trace_error(renv, "invalid is_test flag");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	/* Index */
+
+	ret = sieve_opr_number_read(renv, address, "index", &msg_index);
+	if (ret <= 0)
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	if (is_test > 0) {
+		if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_TESTS)) {
+			sieve_runtime_trace(
+				renv, 0, "testsuite: test_message test");
+			sieve_runtime_trace_descend(renv);
+			sieve_runtime_trace(
+				renv, 0,
+				"check and retrieve smtp message [index=%llu]",
+				(unsigned long long)msg_index);
+		}
+	} else {
+		if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS)) {
+			sieve_runtime_trace(
+				renv, 0, "testsuite: test_message command");
+			sieve_runtime_trace_descend(renv);
+			sieve_runtime_trace(
+				renv, 0,
+				"retrieve smtp message [index=%llu]",
+				(unsigned long long)msg_index);
+		}
+	}
+
+	result = testsuite_smtp_get(renv, msg_index);
+
+	if (is_test > 0) {
+		sieve_interpreter_set_test_result(renv->interp, result);
+		return SIEVE_EXEC_OK;
+	}
+
+	if (!result) {
+		return testsuite_test_failf(
+			renv, "no outgoing SMTP message with index %llu",
+			(unsigned long long)msg_index);
+	}
+
+	return SIEVE_EXEC_OK;
+}
+
+static int
+cmd_test_message_mailbox_operation_execute(const struct sieve_runtime_env *renv,
+					   sieve_size_t *address)
+{
+	string_t *folder;
+	sieve_number_t msg_index;
+	unsigned int is_test = 0;
+	bool result;
+	const char *error;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Is test */
+	if (!sieve_binary_read_byte(renv->sblock, address, &is_test)) {
+		sieve_runtime_trace_error(renv, "invalid is_test flag");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	/* Folder */
+	ret = sieve_opr_string_read(renv, address, "folder", &folder);
+	if (ret <= 0)
+		return ret;
+
+	/* Index */
+	ret = sieve_opr_number_read(renv, address, "index", &msg_index);
+	if (ret <= 0)
+		return ret;
+
+	if (!sieve_mailbox_check_name(str_c(folder), &error)) {
+		return testsuite_test_failf(
+			renv, "invalid mailbox `%s' specified: %s",
+			str_c(folder), error);
+	}
+
+	/*
+	 * Perform operation
+	 */
+
+	if (is_test > 0) {
+		if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_TESTS)) {
+			sieve_runtime_trace(
+				renv, 0, "testsuite: test_message test");
+			sieve_runtime_trace_descend(renv);
+			sieve_runtime_trace(
+				renv, 0, "check and retrieve mailbox message "
+				"[mailbox=`%s' index=%llu]",
+				str_c(folder), (unsigned long long)msg_index);
+		}
+	} else {
+		if (sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS)) {
+			sieve_runtime_trace(
+				renv, 0, "testsuite: test_message command");
+			sieve_runtime_trace_descend(renv);
+			sieve_runtime_trace(
+				renv, 0, "retrieve mailbox message "
+				"[mailbox=`%s' index=%llu]",
+				str_c(folder), (unsigned long long)msg_index);
+		}
+	}
+
+	result = testsuite_mailstore_mail_index(renv, str_c(folder), msg_index);
+
+	if (is_test > 0) {
+		sieve_interpreter_set_test_result(renv->interp, result);
+		return SIEVE_EXEC_OK;
+	}
+
+	if (!result) {
+		return testsuite_test_failf(
+			renv, "no message in folder '%s' with index %llu",
+			str_c(folder), (unsigned long long)msg_index);
+	}
+
+	return SIEVE_EXEC_OK;
+}
+
+static int
+cmd_test_message_print_operation_execute(const struct sieve_runtime_env *renv,
+					 sieve_size_t *address ATTR_UNUSED)
+{
+	struct mail *mail = sieve_message_get_mail(renv->msgctx);
+	struct istream *input;
+	const unsigned char *data;
+	size_t size;
+
+	if (mail_get_stream(mail, NULL, NULL, &input) < 0) {
+		sieve_runtime_error(renv, NULL,	"test_message_print: "
+				    "failed to read current message");
+		return SIEVE_EXEC_OK;
+	}
+
+	printf("\n--MESSAGE: \n");
+
+	/* Pipe the message to the outgoing SMTP transport */
+	while (i_stream_read_more(input, &data, &size) > 0) {
+		ssize_t wret;
+
+		wret = write(1, data, size);
+		if (wret <= 0)
+			break;
+		i_stream_skip(input, wret);
+	}
+	printf("\n--MESSAGE--\n");
+
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/testsuite/cmd-test-result.c b/pigeonhole/src/testsuite/cmd-test-result.c
new file mode 100644
index 0000000..230aa62
--- /dev/null
+++ b/pigeonhole/src/testsuite/cmd-test-result.c
@@ -0,0 +1,138 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-script.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+#include "sieve-dump.h"
+#include "sieve.h"
+
+#include "testsuite-common.h"
+#include "testsuite-result.h"
+#include "testsuite-message.h"
+#include "testsuite-smtp.h"
+
+/*
+ * Commands
+ */
+
+static bool
+cmd_test_result_generate(const struct sieve_codegen_env *cgenv,
+			 struct sieve_command *cmd);
+
+/* Test_result_reset command
+ *
+ * Syntax:
+ *   test_result_reset
+ */
+
+const struct sieve_command_def cmd_test_result_reset = {
+	.identifier = "test_result_reset",
+	.type = SCT_COMMAND,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.generate = cmd_test_result_generate,
+};
+
+/* Test_result_print command
+ *
+ * Syntax:
+ *   test_result_print
+ */
+
+const struct sieve_command_def cmd_test_result_print = {
+	.identifier = "test_result_print",
+	.type = SCT_COMMAND,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.generate = cmd_test_result_generate,
+};
+
+/*
+ * Operations
+ */
+
+/* test_result_reset */
+
+static int
+cmd_test_result_reset_operation_execute(const struct sieve_runtime_env *renv,
+					sieve_size_t *address);
+
+const struct sieve_operation_def test_result_reset_operation = {
+	.mnemonic = "TEST_RESULT_RESET",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_RESULT_RESET,
+	.execute = cmd_test_result_reset_operation_execute,
+};
+
+/* test_result_print */
+
+static int
+cmd_test_result_print_operation_execute(const struct sieve_runtime_env *renv,
+					sieve_size_t *address);
+
+const struct sieve_operation_def test_result_print_operation = {
+	.mnemonic = "TEST_RESULT_PRINT",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_RESULT_PRINT,
+	.execute = cmd_test_result_print_operation_execute,
+};
+
+/*
+ * Code generation
+ */
+
+static bool
+cmd_test_result_generate(const struct sieve_codegen_env *cgenv,
+			 struct sieve_command *cmd)
+{
+	if (sieve_command_is(cmd, cmd_test_result_reset)) {
+		sieve_operation_emit(cgenv->sblock, cmd->ext,
+				     &test_result_reset_operation);
+	} else if (sieve_command_is(cmd, cmd_test_result_print)) {
+		sieve_operation_emit(cgenv->sblock, cmd->ext,
+				     &test_result_print_operation);
+	} else {
+		i_unreached();
+	}
+
+	return TRUE;
+}
+
+/*
+ * Intepretation
+ */
+
+static int
+cmd_test_result_reset_operation_execute(const struct sieve_runtime_env *renv,
+					sieve_size_t *address ATTR_UNUSED)
+{
+	sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS,	"testsuite: "
+			    "test_result_reset command; reset script result");
+
+	testsuite_result_reset(renv);
+	testsuite_smtp_reset();
+
+	return SIEVE_EXEC_OK;
+}
+
+static int
+cmd_test_result_print_operation_execute(const struct sieve_runtime_env *renv,
+					sieve_size_t *address ATTR_UNUSED)
+{
+	sieve_runtime_trace(renv, SIEVE_TRLVL_COMMANDS,	"testsuite: "
+			    "test_result_print command; print script result ");
+
+	testsuite_result_print(renv);
+
+	return SIEVE_EXEC_OK;
+}
diff --git a/pigeonhole/src/testsuite/cmd-test-set.c b/pigeonhole/src/testsuite/cmd-test-set.c
new file mode 100644
index 0000000..22b51d2
--- /dev/null
+++ b/pigeonhole/src/testsuite/cmd-test-set.c
@@ -0,0 +1,161 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "str-sanitize.h"
+#include "istream.h"
+#include "istream-header-filter.h"
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-actions.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-code-dumper.h"
+#include "sieve-result.h"
+
+#include "testsuite-common.h"
+#include "testsuite-objects.h"
+
+#include <stdio.h>
+
+/*
+ * Test_set command
+ *
+ * Syntax
+ *   test_set <testsuite object (member): string> <value: string>
+ */
+
+static bool cmd_test_set_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool cmd_test_set_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd);
+
+const struct sieve_command_def cmd_test_set = {
+	.identifier = "test_set",
+	.type = SCT_COMMAND,
+	.positional_args = 2,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = cmd_test_set_validate,
+	.generate = cmd_test_set_generate
+};
+
+/*
+ * Test_set operation
+ */
+
+static bool cmd_test_set_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int cmd_test_set_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def test_set_operation = {
+	.mnemonic = "TEST_SET",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_SET,
+	.dump = cmd_test_set_operation_dump,
+	.execute = cmd_test_set_operation_execute
+};
+
+/*
+ * Validation
+ */
+
+static bool cmd_test_set_validate
+(struct sieve_validator *valdtr, struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg = cmd->first_positional;
+
+	/* Check arguments */
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, cmd, arg, "object", 1, SAAT_STRING) ) {
+		return FALSE;
+	}
+
+	if ( !testsuite_object_argument_activate(valdtr, arg, cmd) )
+		return FALSE;
+
+	arg = sieve_ast_argument_next(arg);
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, cmd, arg, "value", 2, SAAT_STRING) ) {
+		return FALSE;
+	}
+
+	return sieve_validator_argument_activate(valdtr, cmd, arg, FALSE);
+}
+
+/*
+ * Code generation
+ */
+
+static bool cmd_test_set_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd)
+{
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &test_set_operation);
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, cmd, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool cmd_test_set_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "TEST SET:");
+	sieve_code_descend(denv);
+
+	return
+		testsuite_object_dump(denv, address) &&
+		sieve_opr_string_dump(denv, address, "value");
+}
+
+/*
+ * Intepretation
+ */
+
+static int cmd_test_set_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	struct testsuite_object tobj;
+	string_t *value;
+	int member_id;
+	int ret;
+
+	if ( !testsuite_object_read_member
+		(renv->sblock, address, &tobj, &member_id) ) {
+		sieve_runtime_trace_error(renv, "invalid testsuite object member");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	if ( (ret=sieve_opr_string_read(renv, address, "string", &value)) <= 0 )
+		return ret;
+
+	if ( sieve_runtime_trace_active(renv, SIEVE_TRLVL_COMMANDS) ) {
+		sieve_runtime_trace(renv, 0, "testsuite: test_set command");
+		sieve_runtime_trace_descend(renv);
+		sieve_runtime_trace(renv, 0,
+			"set test parameter '%s' = \"%s\"",
+				testsuite_object_member_name(&tobj, member_id), str_c(value));
+	}
+
+	if ( tobj.def == NULL || tobj.def->set_member == NULL ) {
+		sieve_runtime_trace_error(renv, "unimplemented testsuite object");
+		return SIEVE_EXEC_FAILURE;
+	}
+
+	tobj.def->set_member(renv, member_id, value);
+	return SIEVE_EXEC_OK;
+}
+
+
+
diff --git a/pigeonhole/src/testsuite/cmd-test.c b/pigeonhole/src/testsuite/cmd-test.c
new file mode 100644
index 0000000..c817aed
--- /dev/null
+++ b/pigeonhole/src/testsuite/cmd-test.c
@@ -0,0 +1,208 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+#include "sieve-dump.h"
+
+#include "testsuite-common.h"
+
+/*
+ * Test command
+ *
+ * Syntax:
+ *   test <test-name: string> <block>
+ */
+
+static bool
+cmd_test_validate(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool
+cmd_test_generate(const struct sieve_codegen_env *cgenv,
+		  struct sieve_command *md);
+
+const struct sieve_command_def cmd_test = {
+	.identifier = "test",
+	.type = SCT_COMMAND,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = TRUE,
+	.block_required = TRUE,
+	.validate = cmd_test_validate,
+	.generate = cmd_test_generate,
+};
+
+/*
+ * Test operations
+ */
+
+/* Test operation */
+
+static bool
+cmd_test_operation_dump(const struct sieve_dumptime_env *denv,
+			sieve_size_t *address);
+static int
+cmd_test_operation_execute(const struct sieve_runtime_env *renv,
+			   sieve_size_t *address);
+
+const struct sieve_operation_def test_operation = {
+	.mnemonic = "TEST",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST,
+	.dump = cmd_test_operation_dump,
+	.execute = cmd_test_operation_execute,
+};
+
+/* Test_finish operation */
+
+static int
+cmd_test_finish_operation_execute(const struct sieve_runtime_env *renv,
+				  sieve_size_t *address);
+
+const struct sieve_operation_def test_finish_operation = {
+	.mnemonic = "TEST-FINISH",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_FINISH,
+	.execute = cmd_test_finish_operation_execute,
+};
+
+/*
+ * Validation
+ */
+
+static bool
+cmd_test_validate(struct sieve_validator *valdtr ATTR_UNUSED,
+		  struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *arg = cmd->first_positional;
+
+ 	/* Check valid command placement */
+	if (!sieve_command_is_toplevel(cmd)) {
+		sieve_command_validate_error(
+			valdtr, cmd, "tests cannot be nested: test "
+			"command must be issued at top-level");
+		return FALSE;
+	}
+
+	if (!sieve_validate_positional_argument(valdtr, cmd, arg, "test-name",
+						1, SAAT_STRING))
+		return FALSE;
+
+	return sieve_validator_argument_activate(valdtr, cmd, arg, FALSE);
+}
+
+/*
+ * Code generation
+ */
+
+static inline struct testsuite_generator_context *
+_get_generator_context(struct sieve_generator *gentr)
+{
+	return (struct testsuite_generator_context *)
+		sieve_generator_extension_get_context(gentr, testsuite_ext);
+}
+
+static bool
+cmd_test_generate(const struct sieve_codegen_env *cgenv,
+		  struct sieve_command *cmd)
+{
+	struct testsuite_generator_context *genctx =
+		_get_generator_context(cgenv->gentr);
+
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &test_operation);
+
+	/* Generate arguments */
+	if (!sieve_generate_arguments(cgenv, cmd, NULL))
+		return FALSE;
+
+	/* Prepare jumplist */
+	sieve_jumplist_reset(genctx->exit_jumps);
+	sieve_jumplist_add(genctx->exit_jumps,
+		sieve_binary_emit_offset(cgenv->sblock, 0));
+
+	/* Test body */
+	if (!sieve_generate_block(cgenv, cmd->ast_node))
+		return FALSE;
+
+	sieve_operation_emit(cgenv->sblock, cmd->ext, &test_finish_operation);
+
+	/* Resolve exit jumps to this point */
+	sieve_jumplist_resolve(genctx->exit_jumps);
+
+	return TRUE;
+}
+
+/*
+ * Code dump
+ */
+
+static bool
+cmd_test_operation_dump(const struct sieve_dumptime_env *denv,
+			sieve_size_t *address)
+{
+	sieve_size_t tst_begin;
+	sieve_offset_t tst_end_offset;
+
+	sieve_code_dumpf(denv, "TEST:");
+	sieve_code_descend(denv);
+
+	if (!sieve_opr_string_dump(denv, address, "test name"))
+		return FALSE;
+
+	sieve_code_mark(denv);
+	tst_begin = *address;
+	if (!sieve_binary_read_offset(denv->sblock, address, &tst_end_offset))
+		return FALSE;
+	sieve_code_dumpf(denv, "end: %d [%08llx]",
+			 tst_end_offset,
+			 (unsigned long long)tst_begin + tst_end_offset);
+
+	return TRUE;
+}
+
+/*
+ * Interpretation
+ */
+
+static int
+cmd_test_operation_execute(const struct sieve_runtime_env *renv,
+			   sieve_size_t *address)
+{
+	sieve_size_t tst_begin, tst_end;
+	sieve_offset_t tst_end_offset;
+	string_t *test_name;
+	int ret;
+
+	ret = sieve_opr_string_read(renv, address, "test name", &test_name);
+	if (ret <= 0)
+		return ret;
+
+	tst_begin = *address;
+	if (!sieve_binary_read_offset(renv->sblock, address, &tst_end_offset)) {
+		sieve_runtime_trace_error(renv, "invalid end offset");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+	tst_end = tst_begin + tst_end_offset;
+
+	sieve_runtime_trace_sep(renv);
+	sieve_runtime_trace(renv, SIEVE_TRLVL_NONE,
+			    "** Testsuite test start: \"%s\" (end: %08llx)",
+			    str_c(test_name),
+			    (unsigned long long)tst_end);
+
+	return testsuite_test_start(renv, test_name, tst_end);
+}
+
+static int
+cmd_test_finish_operation_execute(const struct sieve_runtime_env *renv,
+				  sieve_size_t *address)
+{
+	sieve_runtime_trace(renv, SIEVE_TRLVL_NONE, "** Testsuite test end");
+	sieve_runtime_trace_sep(renv);
+
+	return testsuite_test_succeed(renv, address, NULL);
+}
diff --git a/pigeonhole/src/testsuite/ext-testsuite.c b/pigeonhole/src/testsuite/ext-testsuite.c
new file mode 100644
index 0000000..cb9c92f
--- /dev/null
+++ b/pigeonhole/src/testsuite/ext-testsuite.c
@@ -0,0 +1,175 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+/* Extension testsuite
+ * -------------------
+ *
+ * Authors: Stephan Bosch
+ * Specification: vendor-specific
+ *   (FIXME: provide specification for test authors)
+ *
+ */
+
+/*
+ * Purpose: This custom extension is used to add sieve commands and tests that
+ *          act the Sieve engine and on the test suite itself. This practically
+ *          provides the means to completely control and thereby test the Sieve
+ *          compiler and interpreter. This extension transforms the basic Sieve
+ *          language into something much more powerful and suitable to perform
+ *          complex self-test operations. Of course, this extension is only
+ *          available (as vnd.dovecot.testsuite) when the sieve engine is used
+ *          from within the testsuite commandline tool. Test scripts have the
+ *          extension .svtest by convention to distinguish them from any normal
+ *          sieve scripts that may reside in the same directory.
+ *
+ * WARNING: Although this code can serve as an example on how to write
+ *          extensions to the Sieve interpreter, it is generally _NOT_ to be
+ *          used as a source for ideas on new Sieve extensions. Many of the
+ *          commands and tests that this extension introduces conflict with the
+ *          goal and the implied restrictions of the Sieve language. These
+ *          restrictions were put in place with good reason. Therefore, do
+ *          _NOT_ export functionality provided by this testsuite extension to
+ *          your custom extensions that are to be put to general use.
+ */
+
+#include <stdio.h>
+
+#include "sieve-common.h"
+
+#include "sieve-code.h"
+#include "sieve-extensions.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-result.h"
+
+#include "testsuite-common.h"
+#include "testsuite-variables.h"
+#include "testsuite-arguments.h"
+
+/*
+ * Operations
+ */
+
+const struct sieve_operation_def *testsuite_operations[] = {
+	&test_operation,
+	&test_finish_operation,
+	&test_fail_operation,
+	&test_config_set_operation,
+	&test_config_unset_operation,
+	&test_config_reload_operation,
+	&test_set_operation,
+	&test_script_compile_operation,
+	&test_script_run_operation,
+	&test_multiscript_operation,
+	&test_error_operation,
+	&test_result_action_operation,
+	&test_result_execute_operation,
+	&test_result_reset_operation,
+	&test_result_print_operation,
+	&test_message_smtp_operation,
+	&test_message_mailbox_operation,
+	&test_message_print_operation,
+	&test_mailbox_create_operation,
+	&test_mailbox_delete_operation,
+	&test_binary_load_operation,
+	&test_binary_save_operation,
+	&test_imap_metadata_set_operation
+};
+
+/*
+ * Operands
+ */
+
+const struct sieve_operand_def *testsuite_operands[] = {
+	&testsuite_object_operand,
+	&testsuite_substitution_operand,
+	&testsuite_namespace_operand
+};
+
+/*
+ * Extension
+ */
+
+/* Forward declarations */
+
+static bool ext_testsuite_validator_load
+	(const struct sieve_extension *ext, struct sieve_validator *valdtr);
+static bool ext_testsuite_generator_load
+	(const struct sieve_extension *ext, const struct sieve_codegen_env *cgenv);
+static bool ext_testsuite_interpreter_load
+	(const struct sieve_extension *ext, const struct sieve_runtime_env *renv,
+		sieve_size_t *address);
+static bool ext_testsuite_binary_load
+	(const struct sieve_extension *ext, struct sieve_binary *sbin);
+
+/* Extension object */
+
+const struct sieve_extension_def testsuite_extension = {
+	.name = "vnd.dovecot.testsuite",
+	.validator_load = ext_testsuite_validator_load,
+	.generator_load = ext_testsuite_generator_load,
+	.interpreter_load = ext_testsuite_interpreter_load,
+	.binary_load = ext_testsuite_binary_load,
+	SIEVE_EXT_DEFINE_OPERATIONS(testsuite_operations),
+	SIEVE_EXT_DEFINE_OPERANDS(testsuite_operands)
+};
+
+/* Extension implementation */
+
+static bool ext_testsuite_validator_load
+(const struct sieve_extension *ext, struct sieve_validator *valdtr)
+{
+	sieve_validator_register_command(valdtr, ext, &cmd_test);
+	sieve_validator_register_command(valdtr, ext, &cmd_test_fail);
+	sieve_validator_register_command(valdtr, ext, &cmd_test_config_set);
+	sieve_validator_register_command(valdtr, ext, &cmd_test_config_unset);
+	sieve_validator_register_command(valdtr, ext, &cmd_test_config_reload);
+	sieve_validator_register_command(valdtr, ext, &cmd_test_set);
+	sieve_validator_register_command(valdtr, ext, &cmd_test_result_print);
+	sieve_validator_register_command(valdtr, ext, &cmd_test_result_reset);
+	sieve_validator_register_command(valdtr, ext, &cmd_test_message);
+	sieve_validator_register_command(valdtr, ext, &cmd_test_message_print);
+	sieve_validator_register_command(valdtr, ext, &cmd_test_mailbox_create);
+	sieve_validator_register_command(valdtr, ext, &cmd_test_mailbox_delete);
+	sieve_validator_register_command(valdtr, ext, &cmd_test_binary_load);
+	sieve_validator_register_command(valdtr, ext, &cmd_test_binary_save);
+	sieve_validator_register_command(valdtr, ext, &cmd_test_imap_metadata_set);
+
+	sieve_validator_register_command(valdtr, ext, &tst_test_script_compile);
+	sieve_validator_register_command(valdtr, ext, &tst_test_script_run);
+	sieve_validator_register_command(valdtr, ext, &tst_test_multiscript);
+	sieve_validator_register_command(valdtr, ext, &tst_test_error);
+	sieve_validator_register_command(valdtr, ext, &tst_test_result_action);
+	sieve_validator_register_command(valdtr, ext, &tst_test_result_execute);
+
+/*	sieve_validator_argument_override(valdtr, SAT_VAR_STRING, ext,
+		&testsuite_string_argument);*/
+
+	testsuite_variables_init(ext, valdtr);
+
+	return testsuite_validator_context_initialize(valdtr);
+}
+
+static bool ext_testsuite_generator_load
+(const struct sieve_extension *ext, const struct sieve_codegen_env *cgenv)
+{
+	return testsuite_generator_context_initialize(cgenv->gentr, ext);
+}
+
+static bool ext_testsuite_interpreter_load
+(const struct sieve_extension *ext, const struct sieve_runtime_env *renv,
+	sieve_size_t *address ATTR_UNUSED)
+{
+	return testsuite_interpreter_context_initialize(renv->interp, ext);
+}
+
+static bool ext_testsuite_binary_load
+(const struct sieve_extension *ext ATTR_UNUSED, struct sieve_binary *sbin ATTR_UNUSED)
+{
+	return TRUE;
+}
+
+
+
diff --git a/pigeonhole/src/testsuite/testsuite-arguments.c b/pigeonhole/src/testsuite/testsuite-arguments.c
new file mode 100644
index 0000000..f1e17f4
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-arguments.c
@@ -0,0 +1,190 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "array.h"
+
+#include "sieve-common.h"
+#include "sieve-ast.h"
+#include "sieve-commands.h"
+#include "sieve-code.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-dump.h"
+
+#include "testsuite-common.h"
+#include "testsuite-substitutions.h"
+#include "testsuite-arguments.h"
+
+#include <ctype.h>
+
+/*
+ * Testsuite string argument
+ */
+
+static bool arg_testsuite_string_validate
+	(struct sieve_validator *validator, struct sieve_ast_argument **arg,
+		struct sieve_command *context);
+
+const struct sieve_argument_def testsuite_string_argument = {
+	.identifier = "@testsuite-string",
+	.validate = arg_testsuite_string_validate,
+	.generate = sieve_arg_catenated_string_generate,
+};
+
+static bool arg_testsuite_string_validate
+(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+	struct sieve_command *cmd)
+{
+	enum { ST_NONE, ST_OPEN, ST_SUBSTITUTION, ST_PARAM, ST_CLOSE } state =
+		ST_NONE;
+	pool_t pool = sieve_ast_pool((*arg)->ast);
+	struct sieve_arg_catenated_string *catstr = NULL;
+	string_t *str = sieve_ast_argument_str(*arg);
+	const char *p, *strstart, *substart = NULL;
+	const char *strval = (const char *) str_data(str);
+	const char *strend = strval + str_len(str);
+	bool result = TRUE;
+	string_t *subs_name = t_str_new(256);
+	string_t *subs_param = t_str_new(256);
+
+	T_BEGIN {
+		/* Initialize substitution structure */
+
+		p = strval;
+		strstart = p;
+		while ( result && p < strend ) {
+			switch ( state ) {
+
+			/* Nothing found yet */
+			case ST_NONE:
+				if ( *p == '%' ) {
+					substart = p;
+					state = ST_OPEN;
+					str_truncate(subs_name, 0);
+					str_truncate(subs_param, 0);
+				}
+				p++;
+				break;
+
+			/* Got '%' */
+			case ST_OPEN:
+				if ( *p == '{' ) {
+					state = ST_SUBSTITUTION;
+					p++;
+				} else
+					state = ST_NONE;
+				break;
+
+			/* Got '%{' */
+			case ST_SUBSTITUTION:
+				state = ST_PARAM;
+
+				while ( *p != '}' && *p != ':' ) {
+					if ( !i_isalnum(*p) ) {
+						state = ST_NONE;
+						break;
+					}
+					str_append_c(subs_name, *p);
+					p++;
+				}
+				break;
+
+			/* Got '%{name' */
+			case ST_PARAM:
+				if ( *p == ':' ) {
+					p++;
+					while ( *p != '}' ) {
+						str_append_c(subs_param, *p);
+						p++;
+					}
+				}
+				state = ST_CLOSE;
+				break;
+
+			/* Finished parsing param, expecting '}' */
+			case ST_CLOSE:
+				if ( *p == '}' ) {
+					struct sieve_ast_argument *strarg;
+
+					/* We now know that the substitution is valid */
+
+					if ( catstr == NULL ) {
+						catstr = sieve_arg_catenated_string_create(*arg);
+					}
+
+					/* Add the substring that is before the substitution to the
+					 * variable-string AST.
+					 */
+					if ( substart > strstart ) {
+						string_t *newstr = str_new(pool, substart - strstart);
+						str_append_data(newstr, strstart, substart - strstart);
+
+						strarg = sieve_ast_argument_string_create_raw
+							((*arg)->ast, newstr, (*arg)->source_line);
+						sieve_arg_catenated_string_add_element(catstr, strarg);
+
+						/* Give other substitution extensions a chance to do their work */
+						if ( !sieve_validator_argument_activate_super
+							(valdtr, cmd, strarg, FALSE) ) {
+							result = FALSE;
+							break;
+						}
+					}
+
+					strarg = testsuite_substitution_argument_create
+						(valdtr, (*arg)->ast, (*arg)->source_line, str_c(subs_name),
+							str_c(subs_param));
+
+					if ( strarg != NULL )
+						sieve_arg_catenated_string_add_element(catstr, strarg);
+					else {
+						sieve_argument_validate_error(valdtr, *arg,
+							"unknown testsuite substitution type '%s'", str_c(subs_name));
+					}
+
+					strstart = p + 1;
+					substart = strstart;
+
+					p++;
+				}
+
+				/* Finished, reset for the next substitution */
+				state = ST_NONE;
+			}
+		}
+	} T_END;
+
+	/* Bail out early if substitution is invalid */
+	if ( !result ) return FALSE;
+
+	/* Check whether any substitutions were found */
+	if ( catstr == NULL ) {
+		/* No substitutions in this string, pass it on to any other substution
+		 * extension.
+		 */
+		return sieve_validator_argument_activate_super(valdtr, cmd, *arg, TRUE);
+	}
+
+	/* Add the final substring that comes after the last substitution to the
+	 * variable-string AST.
+	 */
+	if ( strend > strstart ) {
+		struct sieve_ast_argument *strarg;
+		string_t *newstr = str_new(pool, strend - strstart);
+		str_append_data(newstr, strstart, strend - strstart);
+
+		strarg = sieve_ast_argument_string_create_raw
+			((*arg)->ast, newstr, (*arg)->source_line);
+		sieve_arg_catenated_string_add_element(catstr, strarg);
+
+		/* Give other substitution extensions a chance to do their work */
+		if ( !sieve_validator_argument_activate_super
+			(valdtr, cmd, strarg, FALSE) )
+			return FALSE;
+	}
+
+	return TRUE;
+}
diff --git a/pigeonhole/src/testsuite/testsuite-arguments.h b/pigeonhole/src/testsuite/testsuite-arguments.h
new file mode 100644
index 0000000..22ab82b
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-arguments.h
@@ -0,0 +1,6 @@
+#ifndef TESTSUITE_ARGUMENTS_H
+#define TESTSUITE_ARGUMENTS_H
+
+extern const struct sieve_argument_def testsuite_string_argument;
+
+#endif
diff --git a/pigeonhole/src/testsuite/testsuite-binary.c b/pigeonhole/src/testsuite/testsuite-binary.c
new file mode 100644
index 0000000..6c875a7
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-binary.c
@@ -0,0 +1,82 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "mempool.h"
+#include "imem.h"
+#include "array.h"
+#include "strfuncs.h"
+#include "unlink-directory.h"
+
+#include "sieve.h"
+#include "sieve-common.h"
+#include "sieve-script.h"
+#include "sieve-binary.h"
+#include "sieve-error.h"
+
+#include "testsuite-common.h"
+#include "testsuite-binary.h"
+
+#include <sys/stat.h>
+#include <sys/types.h>
+
+/*
+ * State
+ */
+
+static char *testsuite_binary_tmp = NULL;
+
+/*
+ * Initialization
+ */
+
+void testsuite_binary_init(void)
+{
+	testsuite_binary_tmp = i_strconcat
+		(testsuite_tmp_dir_get(), "/binaries", NULL);
+
+	if ( mkdir(testsuite_binary_tmp, 0700) < 0 ) {
+		i_fatal("failed to create temporary directory '%s': %m.",
+			testsuite_binary_tmp);
+	}
+}
+
+void testsuite_binary_deinit(void)
+{
+	const char *error;
+
+	if ( unlink_directory(testsuite_binary_tmp, UNLINK_DIRECTORY_FLAG_RMDIR, &error) < 0 ) {
+		i_warning("failed to remove temporary directory '%s': %s.",
+			testsuite_binary_tmp, error);
+	}
+
+	i_free(testsuite_binary_tmp);
+}
+
+void testsuite_binary_reset(void)
+{
+	testsuite_binary_init();
+	testsuite_binary_deinit();
+}
+
+/*
+ * Binary Access
+ */
+
+bool testsuite_binary_save(struct sieve_binary *sbin, const char *name)
+{
+	return ( sieve_save_as(sbin, t_strdup_printf
+		("%s/%s", testsuite_binary_tmp, sieve_binfile_from_name(name)), TRUE,
+			0600, NULL) > 0 );
+}
+
+struct sieve_binary *testsuite_binary_load(const char *name)
+{
+	struct sieve_instance *svinst = testsuite_sieve_instance;
+
+	return sieve_load(svinst, t_strdup_printf
+		("%s/%s", testsuite_binary_tmp, sieve_binfile_from_name(name)), NULL);
+}
+
+
+
diff --git a/pigeonhole/src/testsuite/testsuite-binary.h b/pigeonhole/src/testsuite/testsuite-binary.h
new file mode 100644
index 0000000..0a09d2b
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-binary.h
@@ -0,0 +1,17 @@
+#ifndef TESTSUITE_BINARY_H
+#define TESTSUITE_BINARY_H
+
+#include "sieve-common.h"
+
+void testsuite_binary_init(void);
+void testsuite_binary_deinit(void);
+void testsuite_binary_reset(void);
+
+/*
+ * Binary Access
+ */
+
+bool testsuite_binary_save(struct sieve_binary *sbin, const char *name);
+struct sieve_binary *testsuite_binary_load(const char *name);
+
+#endif
diff --git a/pigeonhole/src/testsuite/testsuite-common.c b/pigeonhole/src/testsuite/testsuite-common.c
new file mode 100644
index 0000000..269deee
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-common.c
@@ -0,0 +1,374 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "string.h"
+#include "ostream.h"
+#include "hash.h"
+#include "mail-storage.h"
+#include "env-util.h"
+#include "unlink-directory.h"
+
+#include "mail-raw.h"
+
+#include "sieve-common.h"
+#include "sieve-code.h"
+#include "sieve-message.h"
+#include "sieve-commands.h"
+#include "sieve-extensions.h"
+#include "sieve-binary.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-result.h"
+#include "sieve-dump.h"
+
+#include "testsuite-common.h"
+#include "testsuite-settings.h"
+#include "testsuite-objects.h"
+#include "testsuite-log.h"
+#include "testsuite-script.h"
+#include "testsuite-binary.h"
+#include "testsuite-result.h"
+#include "testsuite-smtp.h"
+
+#include <string.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <time.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+/*
+ * Global data
+ */
+
+struct sieve_instance *testsuite_sieve_instance = NULL;
+char *testsuite_test_path = NULL;
+
+/* Test context */
+
+static string_t *test_name;
+static sieve_size_t test_block_end;
+static unsigned int test_index;
+static unsigned int test_failures;
+
+/* Extension */
+
+const struct sieve_extension *testsuite_ext;
+
+/*
+ * Validator context
+ */
+
+bool testsuite_validator_context_initialize(struct sieve_validator *valdtr)
+{
+	pool_t pool = sieve_validator_pool(valdtr);
+	struct testsuite_validator_context *ctx =
+		p_new(pool, struct testsuite_validator_context, 1);
+
+	/* Setup object registry */
+	ctx->object_registrations =
+		sieve_validator_object_registry_create(valdtr);
+	testsuite_register_core_objects(ctx);
+
+	sieve_validator_extension_set_context(valdtr, testsuite_ext, ctx);
+
+	return TRUE;
+}
+
+struct testsuite_validator_context *
+testsuite_validator_context_get(struct sieve_validator *valdtr)
+{
+	return (struct testsuite_validator_context *)
+		sieve_validator_extension_get_context(valdtr, testsuite_ext);
+}
+
+/*
+ * Generator context
+ */
+
+bool testsuite_generator_context_initialize(
+	struct sieve_generator *gentr, const struct sieve_extension *this_ext)
+{
+	pool_t pool = sieve_generator_pool(gentr);
+	struct sieve_binary_block *sblock = sieve_generator_get_block(gentr);
+	struct testsuite_generator_context *ctx =
+		p_new(pool, struct testsuite_generator_context, 1);
+
+	/* Setup exit jumplist */
+	ctx->exit_jumps = sieve_jumplist_create(pool, sblock);
+
+	sieve_generator_extension_set_context(gentr, this_ext, ctx);
+
+	return TRUE;
+}
+
+/*
+ * Interpreter context
+ */
+
+static void
+testsuite_interpreter_free(const struct sieve_extension *ext ATTR_UNUSED,
+			   struct sieve_interpreter *interp ATTR_UNUSED,
+			   void *context)
+{
+	struct testsuite_interpreter_context *ctx =
+		(struct testsuite_interpreter_context *)context;
+
+	sieve_binary_unref(&ctx->compiled_script);
+}
+
+const struct sieve_interpreter_extension testsuite_interpreter_ext = {
+	.ext_def = &testsuite_extension,
+	.free = testsuite_interpreter_free,
+};
+
+bool testsuite_interpreter_context_initialize(
+	struct sieve_interpreter *interp, const struct sieve_extension *this_ext)
+{
+	pool_t pool = sieve_interpreter_pool(interp);
+	struct testsuite_interpreter_context *ctx =
+		p_new(pool, struct testsuite_interpreter_context, 1);
+
+	sieve_interpreter_extension_register(interp, this_ext,
+					     &testsuite_interpreter_ext, ctx);
+	return TRUE;
+}
+
+struct testsuite_interpreter_context *
+testsuite_interpreter_context_get(struct sieve_interpreter *interp,
+				  const struct sieve_extension *this_ext)
+{
+	struct testsuite_interpreter_context *ctx =
+		sieve_interpreter_extension_get_context(interp, this_ext);
+
+	return ctx;
+}
+
+/*
+ * Test context
+ */
+
+static void testsuite_test_context_init(void)
+{
+	test_name = str_new(default_pool, 128);
+	test_block_end = 0;
+	test_index = 0;
+	test_failures = 0;
+}
+
+int testsuite_test_start(const struct sieve_runtime_env *renv,
+			 string_t *name, sieve_size_t block_end)
+{
+	if (test_block_end != 0) {
+		sieve_runtime_trace_error(renv, "already inside test block");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+	str_truncate(test_name, 0);
+	str_append_str(test_name, name);
+
+	test_block_end = block_end;
+	test_index++;
+
+	return SIEVE_EXEC_OK;
+}
+
+int testsuite_test_fail(const struct sieve_runtime_env *renv,
+			string_t *reason)
+{
+	return testsuite_test_fail_cstr(renv, str_c(reason));
+}
+
+int testsuite_test_failf(const struct sieve_runtime_env *renv,
+			 const char *fmt, ...)
+{
+	va_list args;
+	int ret;
+
+	va_start(args, fmt);
+	ret = testsuite_test_fail_cstr(renv, t_strdup_vprintf(fmt, args));
+	va_end(args);
+
+	return ret;
+}
+
+int testsuite_test_fail_cstr(const struct sieve_runtime_env *renv,
+			     const char *reason)
+{
+	sieve_size_t end = test_block_end;
+
+	if (str_len(test_name) == 0) {
+		if (reason == NULL || *reason == '\0')
+			printf("%2d: Test FAILED\n", test_index);
+		else
+			printf("%2d: Test FAILED: %s\n", test_index, reason);
+	} else {
+		if (reason == NULL || *reason == '\0') {
+			printf("%2d: Test '%s' FAILED\n",
+			       test_index, str_c(test_name));
+		} else {
+			printf("%2d: Test '%s' FAILED: %s\n",
+			       test_index, str_c(test_name), reason);
+		}
+	}
+
+	str_truncate(test_name, 0);
+	test_block_end = 0;
+
+	test_failures++;
+
+	return sieve_interpreter_program_jump_to(renv->interp, end, FALSE);
+}
+
+void testsuite_testcase_fail(const char *reason)
+{
+	if (reason == NULL || *reason == '\0')
+		printf("XX: Test CASE FAILED\n");
+	else
+		printf("XX: Test CASE FAILED: %s\n", reason);
+
+	test_failures++;
+}
+
+int testsuite_test_succeed(const struct sieve_runtime_env *renv,
+			   sieve_size_t *address, string_t *reason)
+{
+	sieve_size_t end = test_block_end;
+	int ret;
+
+	if (str_len(test_name) == 0) {
+		if (reason == NULL || str_len(reason) == 0)
+			printf("%2d: Test SUCCEEDED\n", test_index);
+		else {
+			printf("%2d: Test SUCCEEDED: %s\n",
+			       test_index, str_c(reason));
+		}
+	} else {
+		if (reason == NULL || str_len(reason) == 0) {
+			printf("%2d: Test '%s' SUCCEEDED\n",
+			       test_index, str_c(test_name));
+		} else {
+			printf("%2d: Test '%s' SUCCEEDED: %s\n", test_index,
+				str_c(test_name), str_c(reason));
+		}
+	}
+
+	str_truncate(test_name, 0);
+	test_block_end = 0;
+
+	if (*address > end) {
+		sieve_runtime_trace_error(
+			renv, "invalid test block end offset");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	} else if (*address < end) {
+		ret = sieve_interpreter_program_jump_to(
+			renv->interp, end, FALSE);
+		if (ret <= 0)
+			return ret;
+	}
+
+	return SIEVE_EXEC_OK;
+}
+
+static void testsuite_test_context_deinit(void)
+{
+	str_free(&test_name);
+}
+
+bool testsuite_testcase_result(bool expect_failure)
+{
+	if (expect_failure) {
+		if (test_failures < test_index) {
+			printf("\nFAIL: Only %d of %d tests failed "
+			       "(all expected to fail).\n\n",
+			       test_failures, test_index);
+			return FALSE;
+		}
+
+		printf("\nPASS: %d tests failed (expected to fail).\n\n",
+		       (test_index == 0 ? 1 : test_index));
+		return TRUE;
+	}
+
+	if (test_failures > 0) {
+		printf("\nFAIL: %d of %d tests failed.\n\n",
+		       test_failures, test_index);
+		return FALSE;
+	}
+
+	printf("\nPASS: %d tests succeeded.\n\n", test_index);
+	return TRUE;
+}
+
+/*
+ * Testsuite temporary directory
+ */
+
+static char *testsuite_tmp_dir;
+
+static void testsuite_tmp_dir_init(void)
+{
+	testsuite_tmp_dir = i_strdup_printf("/tmp/dsieve-testsuite.%s.%s",
+					    dec2str(time(NULL)),
+					    dec2str(getpid()));
+
+	if (mkdir(testsuite_tmp_dir, 0700) < 0) {
+		i_fatal("failed to create temporary directory '%s': %m.",
+			testsuite_tmp_dir);
+	}
+}
+
+static void testsuite_tmp_dir_deinit(void)
+{
+	const char *error;
+
+	if (unlink_directory(testsuite_tmp_dir,
+			     UNLINK_DIRECTORY_FLAG_RMDIR, &error) < 0)
+		i_warning("failed to remove temporary directory '%s': %s.",
+			  testsuite_tmp_dir, error);
+
+	i_free(testsuite_tmp_dir);
+}
+
+const char *testsuite_tmp_dir_get(void)
+{
+	return testsuite_tmp_dir;
+}
+
+/*
+ * Main testsuite init/deinit
+ */
+
+void testsuite_init(struct sieve_instance *svinst, const char *test_path,
+		    bool log_stdout)
+{
+	testsuite_sieve_instance = svinst;
+
+	testsuite_test_context_init();
+	testsuite_log_init(log_stdout);
+	testsuite_tmp_dir_init();
+
+	testsuite_script_init();
+	testsuite_binary_init();
+	testsuite_smtp_init();
+
+	testsuite_ext =
+		sieve_extension_register(svinst, &testsuite_extension, TRUE);
+
+	testsuite_test_path = i_strdup(test_path);
+}
+
+void testsuite_deinit(void)
+{
+	i_free(testsuite_test_path);
+
+	testsuite_smtp_deinit();
+	testsuite_binary_deinit();
+	testsuite_script_deinit();
+
+	testsuite_tmp_dir_deinit();
+	testsuite_log_deinit();
+	testsuite_test_context_deinit();
+}
diff --git a/pigeonhole/src/testsuite/testsuite-common.h b/pigeonhole/src/testsuite/testsuite-common.h
new file mode 100644
index 0000000..9a40cdd
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-common.h
@@ -0,0 +1,193 @@
+#ifndef TESTSUITE_COMMON_H
+#define TESTSUITE_COMMON_H
+
+#include "sieve-common.h"
+
+#include "sieve-tool.h"
+
+/*
+ * Global data
+ */
+
+extern struct sieve_instance *testsuite_sieve_instance;
+
+extern const struct sieve_extension_def testsuite_extension;
+
+extern const struct sieve_extension *testsuite_ext;
+
+extern const struct sieve_script_env *testsuite_scriptenv;
+
+extern char *testsuite_test_path;
+
+
+/*
+ * Validator context
+ */
+
+struct testsuite_validator_context {
+	struct sieve_validator_object_registry *object_registrations;
+};
+
+bool testsuite_validator_context_initialize(struct sieve_validator *valdtr);
+struct testsuite_validator_context *
+testsuite_validator_context_get(struct sieve_validator *valdtr);
+
+/*
+ * Generator context
+ */
+
+struct testsuite_generator_context {
+	struct sieve_jumplist *exit_jumps;
+};
+
+bool testsuite_generator_context_initialize(
+	struct sieve_generator *gentr, const struct sieve_extension *this_ext);
+
+/*
+ * Interpreter context
+ */
+
+struct testsuite_interpreter_context {
+	struct sieve_binary *compiled_script;
+};
+
+bool testsuite_interpreter_context_initialize(
+	struct sieve_interpreter *interp,
+	const struct sieve_extension *this_ext);
+struct testsuite_interpreter_context *
+testsuite_interpreter_context_get(struct sieve_interpreter *interp,
+				  const struct sieve_extension *this_ext);
+
+/*
+ * Commands
+ */
+
+extern const struct sieve_command_def cmd_test;
+extern const struct sieve_command_def cmd_test_fail;
+extern const struct sieve_command_def cmd_test_config_set;
+extern const struct sieve_command_def cmd_test_config_unset;
+extern const struct sieve_command_def cmd_test_config_reload;
+extern const struct sieve_command_def cmd_test_set;
+extern const struct sieve_command_def cmd_test_result_reset;
+extern const struct sieve_command_def cmd_test_result_print;
+extern const struct sieve_command_def cmd_test_message;
+extern const struct sieve_command_def cmd_test_message_print;
+extern const struct sieve_command_def cmd_test_mailbox;
+extern const struct sieve_command_def cmd_test_mailbox_create;
+extern const struct sieve_command_def cmd_test_mailbox_delete;
+extern const struct sieve_command_def cmd_test_binary_load;
+extern const struct sieve_command_def cmd_test_binary_save;
+extern const struct sieve_command_def cmd_test_imap_metadata_set;
+
+/*
+ * Tests
+ */
+
+extern const struct sieve_command_def tst_test_script_compile;
+extern const struct sieve_command_def tst_test_script_run;
+extern const struct sieve_command_def tst_test_multiscript;
+extern const struct sieve_command_def tst_test_error;
+extern const struct sieve_command_def tst_test_result_action;
+extern const struct sieve_command_def tst_test_result_execute;
+
+/*
+ * Operations
+ */
+
+enum testsuite_operation_code {
+	TESTSUITE_OPERATION_TEST,
+	TESTSUITE_OPERATION_TEST_FINISH,
+	TESTSUITE_OPERATION_TEST_FAIL,
+	TESTSUITE_OPERATION_TEST_CONFIG_SET,
+	TESTSUITE_OPERATION_TEST_CONFIG_UNSET,
+	TESTSUITE_OPERATION_TEST_CONFIG_RELOAD,
+	TESTSUITE_OPERATION_TEST_SET,
+	TESTSUITE_OPERATION_TEST_SCRIPT_COMPILE,
+	TESTSUITE_OPERATION_TEST_SCRIPT_RUN,
+	TESTSUITE_OPERATION_TEST_MULTISCRIPT,
+	TESTSUITE_OPERATION_TEST_ERROR,
+	TESTSUITE_OPERATION_TEST_RESULT_ACTION,
+	TESTSUITE_OPERATION_TEST_RESULT_EXECUTE,
+	TESTSUITE_OPERATION_TEST_RESULT_RESET,
+	TESTSUITE_OPERATION_TEST_RESULT_PRINT,
+	TESTSUITE_OPERATION_TEST_MESSAGE_SMTP,
+	TESTSUITE_OPERATION_TEST_MESSAGE_MAILBOX,
+	TESTSUITE_OPERATION_TEST_MESSAGE_PRINT,
+	TESTSUITE_OPERATION_TEST_MAILBOX_CREATE,
+	TESTSUITE_OPERATION_TEST_MAILBOX_DELETE,
+	TESTSUITE_OPERATION_TEST_BINARY_LOAD,
+	TESTSUITE_OPERATION_TEST_BINARY_SAVE,
+	TESTSUITE_OPERATION_TEST_IMAP_METADATA_SET
+};
+
+extern const struct sieve_operation_def test_operation;
+extern const struct sieve_operation_def test_finish_operation;
+extern const struct sieve_operation_def test_fail_operation;
+extern const struct sieve_operation_def test_config_set_operation;
+extern const struct sieve_operation_def test_config_unset_operation;
+extern const struct sieve_operation_def test_config_reload_operation;
+extern const struct sieve_operation_def test_set_operation;
+extern const struct sieve_operation_def test_script_compile_operation;
+extern const struct sieve_operation_def test_script_run_operation;
+extern const struct sieve_operation_def test_multiscript_operation;
+extern const struct sieve_operation_def test_error_operation;
+extern const struct sieve_operation_def test_result_action_operation;
+extern const struct sieve_operation_def test_result_execute_operation;
+extern const struct sieve_operation_def test_result_reset_operation;
+extern const struct sieve_operation_def test_result_print_operation;
+extern const struct sieve_operation_def test_message_smtp_operation;
+extern const struct sieve_operation_def test_message_mailbox_operation;
+extern const struct sieve_operation_def test_message_print_operation;
+extern const struct sieve_operation_def test_mailbox_create_operation;
+extern const struct sieve_operation_def test_mailbox_delete_operation;
+extern const struct sieve_operation_def test_binary_load_operation;
+extern const struct sieve_operation_def test_binary_save_operation;
+extern const struct sieve_operation_def test_imap_metadata_set_operation;
+
+/*
+ * Operands
+ */
+
+extern const struct sieve_operand_def testsuite_object_operand;
+extern const struct sieve_operand_def testsuite_substitution_operand;
+
+enum testsuite_operand_code {
+	TESTSUITE_OPERAND_OBJECT,
+	TESTSUITE_OPERAND_SUBSTITUTION,
+	TESTSUITE_OPERAND_NAMESPACE
+};
+
+/*
+ * Test context
+ */
+
+int testsuite_test_start(const struct sieve_runtime_env *renv,
+			 string_t *name, sieve_size_t block_end);
+int testsuite_test_fail(const struct sieve_runtime_env *renv,
+			string_t *reason);
+int testsuite_test_failf(const struct sieve_runtime_env *renv,
+			 const char *fmt, ...) ATTR_FORMAT(2, 3);
+int testsuite_test_fail_cstr(const struct sieve_runtime_env *renv,
+			     const char *reason);
+
+int testsuite_test_succeed(const struct sieve_runtime_env *renv,
+			   sieve_size_t *address, string_t *reason);
+
+void testsuite_testcase_fail(const char *reason);
+bool testsuite_testcase_result(bool expect_failure);
+
+/*
+ * Testsuite temporary directory
+ */
+
+const char *testsuite_tmp_dir_get(void);
+
+/*
+ * Testsuite init/deinit
+ */
+
+void testsuite_init(struct sieve_instance *svinst, const char *test_path,
+		    bool log_stdout);
+void testsuite_deinit(void);
+
+#endif
diff --git a/pigeonhole/src/testsuite/testsuite-log.c b/pigeonhole/src/testsuite/testsuite-log.c
new file mode 100644
index 0000000..d06b744
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-log.c
@@ -0,0 +1,319 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "array.h"
+
+#include "sieve-common.h"
+#include "sieve-stringlist.h"
+#include "sieve-error-private.h"
+
+#include "testsuite-common.h"
+#include "testsuite-log.h"
+
+/*
+ * Configuration
+ */
+
+bool _testsuite_log_stdout = FALSE;
+
+/*
+ * Testsuite log error handlers
+ */
+
+struct sieve_error_handler *testsuite_log_ehandler = NULL;
+struct sieve_error_handler *testsuite_log_main_ehandler = NULL;
+
+struct _testsuite_log_message {
+	const char *location;
+	const char *message;
+};
+
+static pool_t _testsuite_logmsg_pool = NULL;
+ARRAY(struct _testsuite_log_message) _testsuite_log_errors;
+ARRAY(struct _testsuite_log_message) _testsuite_log_warnings;
+ARRAY(struct _testsuite_log_message) _testsuite_log_messages;
+
+static inline void
+_testsuite_stdout_log(const struct sieve_error_params *params,
+		      const char *prefix, const char *message)
+{
+	if (_testsuite_log_stdout) {
+		if (params->location == NULL || *params->location == '\0') {
+			fprintf(stdout, "LOG: %s: %s\n",
+				prefix, message);
+		} else {
+			fprintf(stdout, "LOG: %s: %s: %s\n",
+				params->location, prefix, message);
+		}
+	}
+}
+
+static void
+_testsuite_log(struct sieve_error_handler *ehandler ATTR_UNUSED,
+	       const struct sieve_error_params *params,
+	       enum sieve_error_flags flags ATTR_UNUSED, const char *message)
+{
+	pool_t pool = _testsuite_logmsg_pool;
+	struct _testsuite_log_message msg;
+	const char *prefix;
+
+	switch (params->log_type) {
+	case LOG_TYPE_ERROR:
+		prefix = "error";
+		break;
+	case LOG_TYPE_WARNING:
+		prefix = "warning";
+		break;
+	case LOG_TYPE_INFO:
+		prefix = "info";
+		break;
+	case LOG_TYPE_DEBUG:
+		prefix = "debug";
+		break;
+	default:
+		i_unreached();
+	}
+
+	_testsuite_stdout_log(params, prefix, message);
+
+	msg.location = p_strdup(pool, params->location);
+	msg.message = p_strdup(pool, message);
+
+	switch (params->log_type) {
+	case LOG_TYPE_ERROR:
+		array_append(&_testsuite_log_errors, &msg, 1);
+		break;
+	case LOG_TYPE_WARNING:
+		array_append(&_testsuite_log_warnings, &msg, 1);
+		break;
+	case LOG_TYPE_INFO:
+		array_append(&_testsuite_log_messages, &msg, 1);
+		break;
+	case LOG_TYPE_DEBUG:
+		break;
+	default:
+		i_unreached();
+	}
+}
+
+static void
+_testsuite_main_log(struct sieve_error_handler *ehandler,
+		    const struct sieve_error_params *params,
+		    enum sieve_error_flags flags, const char *message)
+{
+	if (params->log_type != LOG_TYPE_ERROR)
+		return _testsuite_log(ehandler, params, flags, message);
+
+	if (params->location == NULL || *params->location == '\0')
+		fprintf(stderr, "error: %s\n", message);
+	else
+		fprintf(stderr, "%s: error: %s\n", params->location, message);
+}
+
+static struct sieve_error_handler *_testsuite_log_ehandler_create(void)
+{
+	pool_t pool;
+	struct sieve_error_handler *ehandler;
+
+	pool = pool_alloconly_create("testsuite_log_ehandler",
+				     sizeof(struct sieve_error_handler));
+	ehandler = p_new(pool, struct sieve_error_handler, 1);
+	sieve_error_handler_init(ehandler, testsuite_sieve_instance, pool, 0);
+
+	ehandler->log = _testsuite_log;
+
+	return ehandler;
+}
+
+static struct sieve_error_handler *_testsuite_log_main_ehandler_create(void)
+{
+	pool_t pool;
+	struct sieve_error_handler *ehandler;
+
+	pool = pool_alloconly_create("testsuite_log_main_ehandler",
+				     sizeof(struct sieve_error_handler));
+	ehandler = p_new(pool, struct sieve_error_handler, 1);
+	sieve_error_handler_init(ehandler, testsuite_sieve_instance, pool, 0);
+
+	ehandler->log = _testsuite_main_log;
+
+	return ehandler;
+}
+
+static void ATTR_FORMAT(2, 0)
+testsuite_error_handler(const struct failure_context *ctx, const char *fmt,
+			va_list args)
+{
+	struct sieve_error_params params = {
+		.location = NULL,
+	};
+	pool_t pool = _testsuite_logmsg_pool;
+	struct _testsuite_log_message msg;
+
+	i_zero(&msg);
+	switch (ctx->type) {
+	case LOG_TYPE_DEBUG:
+		T_BEGIN {
+			_testsuite_stdout_log(&params, "debug",
+					      t_strdup_vprintf(fmt, args));
+		} T_END;
+		break;
+	case LOG_TYPE_INFO:
+		msg.message = p_strdup_vprintf(pool, fmt, args);
+		array_append(&_testsuite_log_messages, &msg, 1);
+
+		_testsuite_stdout_log(&params, "info", msg.message);
+		break;
+	case LOG_TYPE_WARNING:
+		msg.message = p_strdup_vprintf(pool, fmt, args);
+		array_append(&_testsuite_log_warnings, &msg, 1);
+
+		_testsuite_stdout_log(&params, "warning", msg.message);
+		break;
+	case LOG_TYPE_ERROR:
+		msg.message = p_strdup_vprintf(pool, fmt, args);
+		array_append(&_testsuite_log_errors, &msg, 1);
+
+		_testsuite_stdout_log(&params, "error", msg.message);
+		break;
+	default:
+		default_error_handler(ctx, fmt, args);
+		break;
+	}
+}
+
+/*
+ *
+ */
+
+void testsuite_log_clear_messages(void)
+{
+	if (_testsuite_logmsg_pool != NULL) {
+		if (array_count(&_testsuite_log_errors) == 0)
+			return;
+		pool_unref(&_testsuite_logmsg_pool);
+	}
+
+	_testsuite_logmsg_pool =
+		pool_alloconly_create("testsuite_log_messages", 8192);
+
+	p_array_init(&_testsuite_log_errors, _testsuite_logmsg_pool, 128);
+	p_array_init(&_testsuite_log_warnings, _testsuite_logmsg_pool, 128);
+	p_array_init(&_testsuite_log_messages, _testsuite_logmsg_pool, 128);
+
+	sieve_error_handler_reset(testsuite_log_ehandler);
+}
+
+/*
+ *
+ */
+
+void testsuite_log_init(bool log_stdout)
+{
+	_testsuite_log_stdout = log_stdout;
+
+	testsuite_log_ehandler = _testsuite_log_ehandler_create();
+	sieve_error_handler_accept_infolog(testsuite_log_ehandler, TRUE);
+	sieve_error_handler_accept_debuglog(testsuite_log_ehandler, TRUE);
+
+	testsuite_log_main_ehandler = _testsuite_log_main_ehandler_create();
+	sieve_error_handler_accept_infolog(testsuite_log_main_ehandler, TRUE);
+	sieve_error_handler_accept_debuglog(testsuite_log_main_ehandler, TRUE);
+
+	i_set_error_handler(testsuite_error_handler);
+	i_set_info_handler(testsuite_error_handler);
+	i_set_debug_handler(testsuite_error_handler);
+
+	testsuite_log_clear_messages();
+}
+
+void testsuite_log_deinit(void)
+{
+	sieve_error_handler_unref(&testsuite_log_ehandler);
+	sieve_error_handler_unref(&testsuite_log_main_ehandler);
+
+	i_set_error_handler(default_error_handler);
+	i_set_info_handler(default_error_handler);
+	i_set_debug_handler(default_error_handler);
+
+	pool_unref(&_testsuite_logmsg_pool);
+}
+
+/*
+ * Log stringlist
+ */
+
+/* Forward declarations */
+
+static int
+testsuite_log_stringlist_next_item(struct sieve_stringlist *_strlist,
+				   string_t **str_r);
+static void testsuite_log_stringlist_reset(struct sieve_stringlist *_strlist);
+
+/* Stringlist object */
+
+struct testsuite_log_stringlist {
+	struct sieve_stringlist strlist;
+
+	int pos, index;
+};
+
+struct sieve_stringlist *
+testsuite_log_stringlist_create(const struct sieve_runtime_env *renv,
+				int index)
+{
+	struct testsuite_log_stringlist *strlist;
+
+	strlist = t_new(struct testsuite_log_stringlist, 1);
+	strlist->strlist.runenv = renv;
+	strlist->strlist.exec_status = SIEVE_EXEC_OK;
+	strlist->strlist.next_item = testsuite_log_stringlist_next_item;
+	strlist->strlist.reset = testsuite_log_stringlist_reset;
+
+ 	strlist->index = index;
+	strlist->pos = 0;
+
+	return &strlist->strlist;
+}
+
+static int
+testsuite_log_stringlist_next_item(struct sieve_stringlist *_strlist,
+				   string_t **str_r)
+{
+	struct testsuite_log_stringlist *strlist =
+		(struct testsuite_log_stringlist *) _strlist;
+	const struct _testsuite_log_message *msg;
+	int pos;
+
+	*str_r = NULL;
+
+	if (strlist->pos < 0)
+		return 0;
+
+	if (strlist->index > 0) {
+		pos = strlist->index - 1;
+		strlist->pos = -1;
+	} else {
+		pos = strlist->pos++;
+	}
+
+	if (pos >= (int) array_count(&_testsuite_log_errors)) {
+		strlist->pos = -1;
+		return 0;
+	}
+
+	msg = array_idx(&_testsuite_log_errors, (unsigned int) pos);
+
+	*str_r = t_str_new_const(msg->message, strlen(msg->message));
+	return 1;
+}
+
+static void testsuite_log_stringlist_reset(struct sieve_stringlist *_strlist)
+{
+	struct testsuite_log_stringlist *strlist =
+		(struct testsuite_log_stringlist *) _strlist;
+
+	strlist->pos = 0;
+}
diff --git a/pigeonhole/src/testsuite/testsuite-log.h b/pigeonhole/src/testsuite/testsuite-log.h
new file mode 100644
index 0000000..335d044
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-log.h
@@ -0,0 +1,26 @@
+#ifndef TESTSUITE_LOG_H
+#define TESTSUITE_LOG_H
+
+#include "sieve-common.h"
+
+extern struct sieve_error_handler *testsuite_log_ehandler;
+extern struct sieve_error_handler *testsuite_log_main_ehandler;
+
+/*
+ * Initialization
+ */
+
+void testsuite_log_init(bool log_stdout);
+void testsuite_log_deinit(void);
+
+/*
+ * Access
+ */
+
+void testsuite_log_clear_messages(void);
+
+struct sieve_stringlist *
+testsuite_log_stringlist_create(const struct sieve_runtime_env *renv,
+				int index);
+
+#endif
diff --git a/pigeonhole/src/testsuite/testsuite-mailstore.c b/pigeonhole/src/testsuite/testsuite-mailstore.c
new file mode 100644
index 0000000..7762d50
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-mailstore.c
@@ -0,0 +1,349 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "mempool.h"
+#include "imem.h"
+#include "array.h"
+#include "strfuncs.h"
+#include "str-sanitize.h"
+#include "path-util.h"
+#include "unlink-directory.h"
+#include "env-util.h"
+#include "mail-namespace.h"
+#include "mail-storage.h"
+#include "imap-metadata.h"
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+#include "sieve-actions.h"
+#include "sieve-interpreter.h"
+
+#include "testsuite-message.h"
+#include "testsuite-common.h"
+#include "testsuite-smtp.h"
+
+#include "testsuite-mailstore.h"
+
+#include <sys/stat.h>
+#include <sys/types.h>
+
+struct testsuite_mailstore_mail {
+	struct testsuite_mailstore_mail *next;
+
+	char *folder;
+	struct mailbox *box;
+	struct mailbox_transaction_context *trans;
+	struct mail *mail;
+};
+
+/*
+ * Forward declarations
+ */
+
+static void testsuite_mailstore_free(bool all);
+
+/*
+ * State
+ */
+
+static struct mail_user *testsuite_mailstore_user = NULL;
+
+static struct testsuite_mailstore_mail *testsuite_mailstore_mail = NULL;
+
+static char *testsuite_mailstore_location = NULL;
+static char *testsuite_mailstore_attrs = NULL;
+
+/*
+ * Initialization
+ */
+
+void testsuite_mailstore_init(void)
+{
+	struct mail_user *mail_user_dovecot, *mail_user;
+	struct mail_namespace *ns;
+	struct mail_namespace_settings *ns_set;
+	struct mail_storage_settings *mail_set;
+	const char *tmpdir, *error, *cwd;
+
+	tmpdir = testsuite_tmp_dir_get();
+	testsuite_mailstore_location =
+		i_strconcat(tmpdir, "/mailstore", NULL);
+	testsuite_mailstore_attrs =
+		i_strconcat(tmpdir, "/mail-attrs.dict", NULL);
+
+	if (mkdir(testsuite_mailstore_location, 0700) < 0) {
+		i_fatal("failed to create temporary directory '%s': %m.",
+			testsuite_mailstore_location);
+	}
+	
+	mail_user_dovecot = sieve_tool_get_mail_user(sieve_tool);
+	mail_user = mail_user_alloc(NULL, "testsuite-mail-user@example.org",
+				    mail_user_dovecot->set_info,
+				    mail_user_dovecot->unexpanded_set);
+	mail_user->autocreated = TRUE;
+	if (t_get_working_dir(&cwd, &error) < 0)
+		i_fatal("Failed to get working directory: %s", error);
+	mail_user_set_home(mail_user, cwd);
+	if (mail_user_init(mail_user, &error) < 0)
+		i_fatal("Testsuite user initialization failed: %s", error);
+
+	ns_set = p_new(mail_user->pool, struct mail_namespace_settings, 1);
+	ns_set->location = testsuite_mailstore_location;
+	ns_set->separator = ".";
+
+	ns = mail_namespaces_init_empty(mail_user);
+	ns->flags |= NAMESPACE_FLAG_INBOX_USER;
+	ns->set = ns_set;
+	/* absolute paths are ok with raw storage */
+	mail_set = p_new(mail_user->pool, struct mail_storage_settings, 1);
+	*mail_set = *ns->mail_set;
+	mail_set->mail_location = p_strconcat(
+		mail_user->pool, "maildir:",
+		testsuite_mailstore_location, NULL);
+	mail_set->mail_attribute_dict = p_strconcat(
+		mail_user->pool, "file:",
+		testsuite_mailstore_attrs, NULL);
+	ns->mail_set = mail_set;
+
+	if (mail_storage_create(ns, "maildir", 0, &error) < 0)
+		i_fatal("Couldn't create testsuite storage: %s", error);
+	if (mail_namespaces_init_finish(ns, &error) < 0)
+		i_fatal("Couldn't create testsuite namespace: %s", error);
+
+	testsuite_mailstore_user = mail_user;
+}
+
+void testsuite_mailstore_deinit(void)
+{
+	const char *error;
+
+	testsuite_mailstore_free(TRUE);
+
+	if (unlink_directory(testsuite_mailstore_location,
+			     UNLINK_DIRECTORY_FLAG_RMDIR, &error) < 0) {
+		i_warning("failed to remove temporary directory '%s': %s.",
+			  testsuite_mailstore_location, error);
+	}
+
+	i_free(testsuite_mailstore_location);
+	i_free(testsuite_mailstore_attrs);
+	mail_user_unref(&testsuite_mailstore_user);
+}
+
+/*
+ * Mail user
+ */
+
+struct mail_user *testsuite_mailstore_get_user(void)
+{
+	if (testsuite_mailstore_user == NULL)
+		return sieve_tool_get_mail_user(sieve_tool);
+	return testsuite_mailstore_user;
+}
+
+/*
+ * Mailbox Access
+ */
+
+bool testsuite_mailstore_mailbox_create(
+	const struct sieve_runtime_env *renv ATTR_UNUSED, const char *folder)
+{
+	struct mail_user *mail_user = testsuite_mailstore_user;
+	struct mail_namespace *ns = mail_user->namespaces;
+	struct mailbox *box;
+
+	box = mailbox_alloc(ns->list, folder, 0);
+
+	if (mailbox_create(box, NULL, FALSE) < 0) {
+		mailbox_free(&box);
+		return FALSE;
+	}
+
+	mailbox_free(&box);
+
+	return TRUE;
+}
+
+static struct testsuite_mailstore_mail *
+testsuite_mailstore_open(const char *folder)
+{
+	enum mailbox_flags flags =
+		MAILBOX_FLAG_SAVEONLY | MAILBOX_FLAG_POST_SESSION;
+	struct mail_user *mail_user = testsuite_mailstore_user;
+	struct mail_namespace *ns = mail_user->namespaces;
+	struct mailbox *box;
+	struct mailbox_transaction_context *t;
+	struct testsuite_mailstore_mail *tmail, *tmail_prev;
+	const char *error;
+
+	if (!sieve_mailbox_check_name(folder, &error)) {
+		e_error(testsuite_sieve_instance->event,
+			"testsuite: invalid mailbox name `%s' specified: %s",
+			folder, error);
+		return NULL;
+	}
+
+	tmail = testsuite_mailstore_mail;
+	tmail_prev = NULL;
+	while (tmail != NULL) {
+		if (strcmp(tmail->folder, folder) == 0) {
+			if (tmail_prev != NULL) {
+				/* Remove it from list if it is not first. */
+				tmail_prev->next = tmail->next;
+			}
+			break;
+		}
+		tmail_prev = tmail;
+		tmail = tmail->next;
+	}
+	if (tmail != NULL) {
+		if (tmail != testsuite_mailstore_mail) {
+			/* Bring it to front */
+			tmail->next = testsuite_mailstore_mail;
+			testsuite_mailstore_mail = tmail;
+		}
+		return tmail;
+	}
+
+	box = mailbox_alloc(ns->list, folder, flags);
+	if (mailbox_open(box) < 0) {
+		e_error(testsuite_sieve_instance->event,
+			"testsuite: failed to open mailbox '%s'", folder);
+		mailbox_free(&box);
+		return NULL;
+	}
+
+	/* Sync mailbox */
+
+	if (mailbox_sync(box, MAILBOX_SYNC_FLAG_FULL_READ) < 0) {
+		e_error(testsuite_sieve_instance->event,
+			"testsuite: failed to sync mailbox '%s'", folder);
+		mailbox_free(&box);
+		return NULL;
+	}
+
+	/* Start transaction */
+
+	t = mailbox_transaction_begin(box, 0, __func__);
+
+	tmail = i_new(struct testsuite_mailstore_mail, 1);
+	tmail->next = testsuite_mailstore_mail;
+	testsuite_mailstore_mail = tmail;
+
+	tmail->folder = i_strdup(folder);
+	tmail->box = box;
+	tmail->trans = t;
+	tmail->mail = mail_alloc(t, 0, NULL);
+
+	return tmail;
+}
+
+static void testsuite_mailstore_free(bool all)
+{
+	struct testsuite_mailstore_mail *tmail;
+
+	if (testsuite_mailstore_mail == NULL)
+		return;
+
+	tmail = (all ?
+		 testsuite_mailstore_mail : testsuite_mailstore_mail->next);
+	while (tmail != NULL) {
+		struct testsuite_mailstore_mail *tmail_next = tmail->next;
+
+		mail_free(&tmail->mail);
+		mailbox_transaction_rollback(&tmail->trans);
+		mailbox_free(&tmail->box);
+		i_free(tmail->folder);
+		i_free(tmail);
+
+		tmail = tmail_next;
+	}
+	if (all)
+		testsuite_mailstore_mail = NULL;
+	else
+		testsuite_mailstore_mail->next = NULL;
+}
+
+void testsuite_mailstore_flush(void)
+{
+	testsuite_mailstore_free(FALSE);
+}
+
+bool testsuite_mailstore_mail_index(const struct sieve_runtime_env *renv,
+				    const char *folder, unsigned int index)
+{
+	struct testsuite_mailstore_mail *tmail;
+	struct mailbox_status status;
+
+	tmail = testsuite_mailstore_open(folder);
+	if (tmail == NULL)
+		return FALSE;
+
+	mailbox_get_open_status(tmail->box, STATUS_MESSAGES, &status);
+	if (index >= status.messages)
+		return FALSE;
+
+	mail_set_seq(tmail->mail, index+1);
+	testsuite_message_set_mail(renv, tmail->mail);
+
+	return TRUE;
+}
+
+/*
+ * IMAP metadata
+ */
+
+int testsuite_mailstore_set_imap_metadata(const char *mailbox,
+					  const char *annotation,
+					  const char *value)
+{
+	struct imap_metadata_transaction *imtrans;
+	struct mail_attribute_value avalue;
+	struct mailbox *box;
+	enum mail_error error_code;
+	const char *error;
+	int ret;
+
+	if (!imap_metadata_verify_entry_name(annotation, &error)) {
+		e_error(testsuite_sieve_instance->event,
+			"testsuite: imap metadata: "
+			"specified annotation name `%s' is invalid: %s",
+			str_sanitize(annotation, 256), error);
+		return -1;
+	}
+
+	if (mailbox != NULL) {
+		struct mail_namespace *ns;
+		ns = mail_namespace_find(testsuite_mailstore_user->namespaces,
+					 mailbox);
+		box = mailbox_alloc(ns->list, mailbox, 0);
+		imtrans = imap_metadata_transaction_begin(box);
+	} else {
+		box = NULL;
+		imtrans = imap_metadata_transaction_begin_server(
+			testsuite_mailstore_user);
+	}
+
+	i_zero(&avalue);
+	avalue.value = value;
+	if ((ret = imap_metadata_set(imtrans, annotation, &avalue)) < 0) {
+		error = imap_metadata_transaction_get_last_error(
+			imtrans, &error_code);
+		imap_metadata_transaction_rollback(&imtrans);
+	} else {
+		ret = imap_metadata_transaction_commit(&imtrans,
+						       &error_code, &error);
+	}
+	if (box != NULL)
+		mailbox_free(&box);
+
+	if (ret < 0) {
+		e_error(testsuite_sieve_instance->event,
+			"testsuite: imap metadata: "
+			"failed to assign annotation `%s': %s",
+			str_sanitize(annotation, 256), error);
+		return -1;
+	}
+	return 0;
+}
diff --git a/pigeonhole/src/testsuite/testsuite-mailstore.h b/pigeonhole/src/testsuite/testsuite-mailstore.h
new file mode 100644
index 0000000..07b0ab0
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-mailstore.h
@@ -0,0 +1,40 @@
+#ifndef TESTSUITE_MAILSTORE_H
+#define TESTSUITE_MAILSTORE_H
+
+#include "lib.h"
+
+#include "sieve-common.h"
+
+/*
+ * Initialization
+ */
+
+void testsuite_mailstore_init(void);
+void testsuite_mailstore_deinit(void);
+void testsuite_mailstore_flush(void);
+
+/*
+ * Mail user
+ */
+
+struct mail_user *testsuite_mailstore_get_user(void);
+
+/*
+ * Mailbox Access
+ */
+
+bool testsuite_mailstore_mailbox_create(
+	const struct sieve_runtime_env *renv ATTR_UNUSED, const char *folder);
+
+bool testsuite_mailstore_mail_index(const struct sieve_runtime_env *renv,
+				    const char *folder, unsigned int index);
+
+/*
+ * IMAP metadata
+ */
+
+int testsuite_mailstore_set_imap_metadata(const char *mailbox,
+					  const char *annotation,
+					  const char *value);
+
+#endif
diff --git a/pigeonhole/src/testsuite/testsuite-message.c b/pigeonhole/src/testsuite/testsuite-message.c
new file mode 100644
index 0000000..68e20eb
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-message.c
@@ -0,0 +1,339 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "str.h"
+#include "istream.h"
+#include "smtp-params.h"
+#include "message-address.h"
+#include "mail-storage.h"
+#include "master-service.h"
+#include "mail-raw.h"
+
+#include "sieve-common.h"
+#include "sieve-address.h"
+#include "sieve-error.h"
+#include "sieve-message.h"
+#include "sieve-interpreter.h"
+
+#include "sieve-tool.h"
+
+#include "testsuite-common.h"
+#include "testsuite-message.h"
+
+/*
+ * Testsuite message environment
+ */
+
+struct testsuite_message {
+	struct testsuite_message *next;
+
+	struct mail_raw *mail_raw;
+};
+
+struct sieve_message_data testsuite_msgdata;
+static struct smtp_params_rcpt testsuite_rcpt_params;
+
+static struct testsuite_message *testsuite_msg;
+
+static const char *_default_message_data =
+"From: sender@example.com\n"
+"To: recipient@example.org\n"
+"Subject: Frop!\n"
+"\n"
+"Friep!\n";
+
+static struct smtp_address *testsuite_env_mail_from = NULL;
+static struct smtp_address *testsuite_env_rcpt_to = NULL;
+static struct smtp_address *testsuite_env_orig_rcpt_to = NULL;
+static char *testsuite_env_auth = NULL;
+
+static pool_t testsuite_msg_pool;
+static char *testsuite_msg_id = NULL;
+
+static const struct smtp_address *
+testsuite_message_get_address(struct mail *mail, const char *header)
+{
+	struct message_address *addr;
+	struct smtp_address *smtp_addr;
+	const char *str;
+
+	if (mail_get_first_header(mail, header, &str) <= 0)
+		return NULL;
+	addr = message_address_parse(pool_datastack_create(),
+				     (const unsigned char *)str,
+				     strlen(str), 1, 0);
+	if (addr == NULL || addr->mailbox == NULL || *addr->mailbox == '\0')
+		return NULL;
+	if (smtp_address_create_from_msg_temp(addr, &smtp_addr) < 0)
+		return NULL;
+	return smtp_addr;
+}
+
+static void testsuite_message_set_data(struct mail *mail)
+{
+	const struct smtp_address *recipient = NULL, *sender = NULL;
+	const char *msg_id;
+
+	static const struct smtp_address default_recipient = {
+		.localpart = "recipient",
+		.domain = "example.com",
+	};
+	static const struct smtp_address default_sender = {
+		.localpart = "sender",
+		.domain = "example.com",
+	};
+
+	i_free(testsuite_env_mail_from);
+	i_free(testsuite_env_rcpt_to);
+	i_free(testsuite_env_orig_rcpt_to);
+	i_free(testsuite_env_auth);
+	i_free(testsuite_msg_id);
+
+	/*
+	 * Collect necessary message data
+	 */
+
+	/* Get recipient address */
+	recipient = testsuite_message_get_address(mail, "Envelope-To");
+	if (recipient == NULL)
+		recipient = testsuite_message_get_address(mail, "To");
+	if (recipient == NULL)
+		recipient = &default_recipient;
+
+	/* Get sender address */
+	sender = testsuite_message_get_address(mail, "Return-path");
+	if (sender == NULL)
+		sender = testsuite_message_get_address(mail, "Sender");
+	if (sender == NULL)
+		sender = testsuite_message_get_address(mail, "From");
+	if (sender == NULL)
+		sender = &default_sender;
+
+	testsuite_env_mail_from = smtp_address_clone(default_pool, sender);
+	testsuite_env_rcpt_to = smtp_address_clone(default_pool, recipient);
+	testsuite_env_orig_rcpt_to = smtp_address_clone(default_pool, recipient);
+
+	(void)mail_get_message_id(mail, &msg_id);
+	testsuite_msg_id = i_strdup(msg_id);
+
+	i_zero(&testsuite_msgdata);
+	testsuite_msgdata.mail = mail;
+	testsuite_msgdata.auth_user = sieve_tool_get_username(sieve_tool);
+	testsuite_msgdata.envelope.mail_from = testsuite_env_mail_from;
+	testsuite_msgdata.envelope.rcpt_to = testsuite_env_rcpt_to;
+	testsuite_msgdata.id = testsuite_msg_id;
+
+	i_zero(&testsuite_rcpt_params);
+	testsuite_rcpt_params.orcpt.addr = testsuite_env_orig_rcpt_to;
+
+	testsuite_msgdata.envelope.rcpt_params = &testsuite_rcpt_params;
+}
+
+static struct testsuite_message *testsuite_message_new(void)
+{
+	struct testsuite_message *msg;
+
+	msg = i_new(struct testsuite_message, 1);
+	msg->next = testsuite_msg;
+	testsuite_msg = msg;
+
+	return msg;
+}
+
+static void testsuite_message_new_string(string_t *mail_str)
+{
+	struct mail_user *mail_raw_user =
+		sieve_tool_get_mail_raw_user(sieve_tool);
+	struct testsuite_message *msg;
+
+	msg = testsuite_message_new();
+	msg->mail_raw = mail_raw_open_data(mail_raw_user, mail_str);
+
+	testsuite_message_set_data(msg->mail_raw->mail);
+}
+
+static void testsuite_message_new_file(const char *mail_path)
+{
+	struct mail_user *mail_raw_user =
+		sieve_tool_get_mail_raw_user(sieve_tool);
+	struct testsuite_message *msg;
+
+	msg = testsuite_message_new();
+	msg->mail_raw = mail_raw_open_file(mail_raw_user, mail_path);
+
+	testsuite_message_set_data(msg->mail_raw->mail);
+}
+
+static void testsuite_message_free(bool all)
+{
+	struct testsuite_message *msg;
+
+	if (testsuite_msg == NULL)
+		return;
+
+	msg = (all ? testsuite_msg : testsuite_msg->next);
+	while (msg != NULL) {
+		struct testsuite_message *msg_next = msg->next;
+
+		mail_raw_close(&msg->mail_raw);
+		i_free(msg);
+
+		msg = msg_next;
+	}
+	if (all)
+		testsuite_msg = NULL;
+	else
+		testsuite_msg->next = NULL;
+}
+
+void testsuite_message_flush(void)
+{
+	testsuite_message_free(FALSE);
+}
+
+void testsuite_message_init(void)
+{
+	testsuite_msg_pool = pool_alloconly_create("testsuite_message", 6096);
+
+	string_t *default_message = str_new(testsuite_msg_pool, 1024);
+	str_append(default_message, _default_message_data);
+
+	testsuite_message_new_string(default_message);
+}
+
+void testsuite_message_set_string(const struct sieve_runtime_env *renv,
+				  string_t *message)
+{
+	sieve_message_context_reset(renv->msgctx);
+
+	testsuite_message_new_string(message);
+}
+
+void testsuite_message_set_file(const struct sieve_runtime_env *renv,
+				const char *file_path)
+{
+	sieve_message_context_reset(renv->msgctx);
+
+	testsuite_message_new_file(file_path);
+}
+
+void testsuite_message_set_mail(const struct sieve_runtime_env *renv,
+				struct mail *mail)
+{
+	sieve_message_context_reset(renv->msgctx);
+
+	testsuite_message_set_data(mail);
+}
+
+void testsuite_message_deinit(void)
+{
+	testsuite_message_free(TRUE);
+
+	i_free(testsuite_env_mail_from);
+	i_free(testsuite_env_rcpt_to);
+	i_free(testsuite_env_orig_rcpt_to);
+	i_free(testsuite_env_auth);
+	pool_unref(&testsuite_msg_pool);
+	i_free(testsuite_msg_id);
+}
+
+void testsuite_envelope_set_sender_address(const struct sieve_runtime_env *renv,
+					   const struct smtp_address *address)
+{
+	sieve_message_context_reset(renv->msgctx);
+
+	i_free(testsuite_env_mail_from);
+
+	testsuite_env_mail_from = smtp_address_clone(default_pool, address);
+	testsuite_msgdata.envelope.mail_from = testsuite_env_mail_from;
+}
+
+void testsuite_envelope_set_sender(const struct sieve_runtime_env *renv,
+				   const char *value)
+{
+	struct smtp_address *address = NULL;
+	const char *error;
+
+	if (smtp_address_parse_path(pool_datastack_create(), value,
+				    (SMTP_ADDRESS_PARSE_FLAG_ALLOW_EMPTY |
+				     SMTP_ADDRESS_PARSE_FLAG_BRACKETS_OPTIONAL),
+				    &address, &error) < 0) {
+		e_error(testsuite_sieve_instance->event,
+			"testsuite: envelope sender address "
+			"`%s' is invalid: %s", value, error);
+	}
+	testsuite_envelope_set_sender_address(renv, address);
+}
+
+void testsuite_envelope_set_recipient_address(
+	const struct sieve_runtime_env *renv,
+	const struct smtp_address *address)
+{
+	sieve_message_context_reset(renv->msgctx);
+
+	i_free(testsuite_env_rcpt_to);
+	i_free(testsuite_env_orig_rcpt_to);
+
+	testsuite_env_rcpt_to = smtp_address_clone(default_pool, address);
+	testsuite_env_orig_rcpt_to = smtp_address_clone(default_pool, address);
+	testsuite_msgdata.envelope.rcpt_to = testsuite_env_rcpt_to;
+	testsuite_rcpt_params.orcpt.addr = testsuite_env_orig_rcpt_to;
+}
+
+void testsuite_envelope_set_recipient(const struct sieve_runtime_env *renv,
+				      const char *value)
+{
+	struct smtp_address *address = NULL;
+	const char *error;
+
+	if (smtp_address_parse_path(pool_datastack_create(), value,
+				    (SMTP_ADDRESS_PARSE_FLAG_ALLOW_LOCALPART |
+				     SMTP_ADDRESS_PARSE_FLAG_BRACKETS_OPTIONAL),
+				    &address, &error) < 0) {
+		e_error(testsuite_sieve_instance->event,
+			"testsuite: envelope recipient address "
+			"`%s' is invalid: %s", value, error);
+	}
+	testsuite_envelope_set_recipient_address(renv, address);
+}
+
+void testsuite_envelope_set_orig_recipient_address(
+	const struct sieve_runtime_env *renv,
+	const struct smtp_address *address)
+{
+	sieve_message_context_reset(renv->msgctx);
+
+	i_free(testsuite_env_orig_rcpt_to);
+
+	testsuite_env_orig_rcpt_to = smtp_address_clone(default_pool, address);
+	testsuite_rcpt_params.orcpt.addr = testsuite_env_orig_rcpt_to;
+}
+
+void testsuite_envelope_set_orig_recipient(const struct sieve_runtime_env *renv,
+					   const char *value)
+{
+	struct smtp_address *address = NULL;
+	const char *error;
+
+	if (smtp_address_parse_path(pool_datastack_create(), value,
+				    (SMTP_ADDRESS_PARSE_FLAG_ALLOW_LOCALPART |
+				     SMTP_ADDRESS_PARSE_FLAG_BRACKETS_OPTIONAL),
+				    &address, &error) < 0) {
+		e_error(testsuite_sieve_instance->event,
+			"testsuite: envelope recipient address "
+			"`%s' is invalid: %s", value, error);
+	}
+	testsuite_envelope_set_orig_recipient_address(renv, address);
+}
+
+void testsuite_envelope_set_auth_user(const struct sieve_runtime_env *renv,
+				      const char *value)
+{
+	sieve_message_context_reset(renv->msgctx);
+
+	i_free(testsuite_env_auth);
+
+	testsuite_env_auth = i_strdup(value);
+	testsuite_msgdata.auth_user = testsuite_env_auth;
+}
diff --git a/pigeonhole/src/testsuite/testsuite-message.h b/pigeonhole/src/testsuite/testsuite-message.h
new file mode 100644
index 0000000..2a4d3b4
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-message.h
@@ -0,0 +1,44 @@
+#ifndef TESTSUITE_MESSAGE_H
+#define TESTSUITE_MESSAGE_H
+
+#include "lib.h"
+#include "master-service.h"
+
+#include "sieve-common.h"
+#include "sieve-tool.h"
+
+extern struct sieve_message_data testsuite_msgdata;
+
+void testsuite_message_init(void);
+void testsuite_message_deinit(void);
+
+void testsuite_message_flush(void);
+
+void testsuite_message_set_string(const struct sieve_runtime_env *renv,
+				  string_t *message);
+void testsuite_message_set_file(const struct sieve_runtime_env *renv,
+				const char *file_path);
+void testsuite_message_set_mail(const struct sieve_runtime_env *renv,
+				struct mail *mail);
+
+void testsuite_envelope_set_sender_address(const struct sieve_runtime_env *renv,
+					   const struct smtp_address *address);
+void testsuite_envelope_set_sender(const struct sieve_runtime_env *renv,
+				   const char *value);
+
+void testsuite_envelope_set_recipient_address(
+	const struct sieve_runtime_env *renv,
+	const struct smtp_address *address);
+void testsuite_envelope_set_recipient(const struct sieve_runtime_env *renv,
+				      const char *value);
+
+void testsuite_envelope_set_orig_recipient_address(
+	const struct sieve_runtime_env *renv,
+	const struct smtp_address *address);
+void testsuite_envelope_set_orig_recipient(const struct sieve_runtime_env *renv,
+					   const char *value);
+
+void testsuite_envelope_set_auth_user(const struct sieve_runtime_env *renv,
+				      const char *value);
+
+#endif
diff --git a/pigeonhole/src/testsuite/testsuite-objects.c b/pigeonhole/src/testsuite/testsuite-objects.c
new file mode 100644
index 0000000..4c09c85
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-objects.c
@@ -0,0 +1,369 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "string.h"
+#include "ostream.h"
+#include "hash.h"
+#include "mail-storage.h"
+
+#include "sieve.h"
+#include "sieve-code.h"
+#include "sieve-commands.h"
+#include "sieve-extensions.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-binary.h"
+#include "sieve-dump.h"
+
+#include "testsuite-common.h"
+#include "testsuite-objects.h"
+#include "testsuite-message.h"
+
+/*
+ * Testsuite core objects
+ */
+
+enum testsuite_object_code {
+	TESTSUITE_OBJECT_MESSAGE,
+	TESTSUITE_OBJECT_ENVELOPE
+};
+
+const struct testsuite_object_def *testsuite_core_objects[] = {
+	&message_testsuite_object, &envelope_testsuite_object
+};
+
+const unsigned int testsuite_core_objects_count =
+	N_ELEMENTS(testsuite_core_objects);
+
+/*
+ * Testsuite object registry
+ */
+
+static inline struct sieve_validator_object_registry *_get_object_registry
+(struct sieve_validator *valdtr)
+{
+	struct testsuite_validator_context *ctx =
+		testsuite_validator_context_get(valdtr);
+
+	return ctx->object_registrations;
+}
+
+void testsuite_object_register
+(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+	const struct testsuite_object_def *tobj_def)
+{
+	struct sieve_validator_object_registry *regs = _get_object_registry(valdtr);
+
+	sieve_validator_object_registry_add(regs, ext, &tobj_def->obj_def);
+}
+
+static const struct testsuite_object *testsuite_object_create
+(struct sieve_validator *valdtr, struct sieve_command *cmd,
+	const char *identifier)
+{
+	struct sieve_validator_object_registry *regs = _get_object_registry(valdtr);
+	struct sieve_object object;
+	struct testsuite_object *tobj;
+
+	if ( !sieve_validator_object_registry_find(regs, identifier, &object) )
+		return NULL;
+
+	tobj = p_new(sieve_command_pool(cmd), struct testsuite_object, 1);
+	tobj->object = object;
+	tobj->def = (const struct testsuite_object_def *) object.def;
+
+  return tobj;
+}
+
+void testsuite_register_core_objects
+(struct testsuite_validator_context *ctx)
+{
+	struct sieve_validator_object_registry *regs = ctx->object_registrations;
+	unsigned int i;
+
+	/* Register core testsuite objects */
+	for ( i = 0; i < testsuite_core_objects_count; i++ ) {
+		const struct testsuite_object_def *tobj_def = testsuite_core_objects[i];
+
+		sieve_validator_object_registry_add
+			(regs, testsuite_ext, &tobj_def->obj_def);
+	}
+}
+
+/*
+ * Testsuite object code
+ */
+
+const struct sieve_operand_class sieve_testsuite_object_operand_class =
+	{ "testsuite object" };
+
+static const struct sieve_extension_objects core_testsuite_objects =
+	SIEVE_EXT_DEFINE_OBJECTS(testsuite_core_objects);
+
+const struct sieve_operand_def testsuite_object_operand = {
+	.name = "testsuite-object",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERAND_OBJECT,
+	.class = &sieve_testsuite_object_operand_class,
+	.interface = &core_testsuite_objects
+};
+
+static void testsuite_object_emit
+(struct sieve_binary_block *sblock, const struct testsuite_object *tobj,
+	int member_id)
+{
+	sieve_opr_object_emit(sblock, tobj->object.ext, tobj->object.def);
+
+	if ( tobj->def != NULL && tobj->def->get_member_id != NULL ) {
+		(void) sieve_binary_emit_byte(sblock, (unsigned char) member_id);
+	}
+}
+
+bool testsuite_object_read
+(struct sieve_binary_block *sblock, sieve_size_t *address,
+	struct testsuite_object *tobj)
+{
+	struct sieve_operand oprnd;
+
+	if ( !sieve_operand_read(sblock, address, NULL, &oprnd) )
+		return FALSE;
+
+	if ( !sieve_opr_object_read_data
+		(sblock, &oprnd, &sieve_testsuite_object_operand_class, address,
+			&tobj->object) )
+		return FALSE;
+
+	tobj->def = (const struct testsuite_object_def *) tobj->object.def;
+	i_assert(tobj->def != NULL);
+	return TRUE;
+}
+
+bool testsuite_object_read_member
+(struct sieve_binary_block *sblock, sieve_size_t *address,
+	struct testsuite_object *tobj, int *member_id_r)
+{
+	if ( !testsuite_object_read(sblock, address, tobj) )
+		return FALSE;
+
+	*member_id_r = -1;
+	if ( tobj->def->get_member_id != NULL ) {
+		if ( !sieve_binary_read_code(sblock, address, member_id_r) )
+			return FALSE;
+	}
+
+	return TRUE;
+}
+
+const char *testsuite_object_member_name
+(const struct testsuite_object *object, int member_id)
+{
+	const struct testsuite_object_def *obj_def = object->def;
+	const char *member = NULL;
+
+	if ( obj_def->get_member_id != NULL ) {
+		if ( obj_def->get_member_name != NULL )
+			member = obj_def->get_member_name(member_id);
+	} else
+		return obj_def->obj_def.identifier;
+
+	if ( member == NULL )
+		return t_strdup_printf("%s.%d", obj_def->obj_def.identifier, member_id);
+
+	return t_strdup_printf("%s.%s", obj_def->obj_def.identifier, member);
+}
+
+bool testsuite_object_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	struct testsuite_object object;
+	int member_id;
+
+	sieve_code_mark(denv);
+
+	if ( !testsuite_object_read_member
+		(denv->sblock, address, &object, &member_id) )
+		return FALSE;
+
+	sieve_code_dumpf(denv, "%s: %s",
+		sieve_testsuite_object_operand_class.name,
+		testsuite_object_member_name(&object, member_id));
+
+	return TRUE;
+}
+
+/*
+ * Testsuite object argument
+ */
+
+static bool arg_testsuite_object_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+		struct sieve_command *cmd);
+
+const struct sieve_argument_def testsuite_object_argument = {
+	.identifier = "testsuite-object",
+	.generate = arg_testsuite_object_generate
+};
+
+struct testsuite_object_argctx {
+	const struct testsuite_object *object;
+	int member;
+};
+
+bool testsuite_object_argument_activate
+(struct sieve_validator *valdtr, struct sieve_ast_argument *arg,
+	struct sieve_command *cmd)
+{
+	const char *objname = sieve_ast_argument_strc(arg);
+	const struct testsuite_object *tobj;
+	int member_id;
+	const char *member;
+	struct testsuite_object_argctx *ctx;
+
+	/* Parse the object specifier */
+
+	member = strchr(objname, '.');
+	if ( member != NULL ) {
+		objname = t_strdup_until(objname, member);
+		member++;
+	}
+
+	/* Find the object */
+
+	tobj = testsuite_object_create(valdtr, cmd, objname);
+	if ( tobj == NULL ) {
+		sieve_argument_validate_error(valdtr, arg,
+			"unknown testsuite object '%s'", objname);
+		return FALSE;
+	}
+
+	/* Find the object member */
+
+	member_id = -1;
+	if ( member != NULL ) {
+		if ( tobj->def == NULL || tobj->def->get_member_id == NULL ||
+			(member_id=tobj->def->get_member_id(member)) == -1 ) {
+			sieve_argument_validate_error(valdtr, arg,
+				"member '%s' does not exist for testsuite object '%s'", member, objname);
+			return FALSE;
+		}
+	}
+
+	/* Assign argument context */
+
+	ctx = p_new(sieve_command_pool(cmd), struct testsuite_object_argctx, 1);
+	ctx->object = tobj;
+	ctx->member = member_id;
+
+	arg->argument = sieve_argument_create
+		(arg->ast, &testsuite_object_argument, testsuite_ext, 0);
+	arg->argument->data = (void *) ctx;
+
+	return TRUE;
+}
+
+static bool arg_testsuite_object_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+	struct sieve_command *cmd ATTR_UNUSED)
+{
+	struct testsuite_object_argctx *ctx =
+		(struct testsuite_object_argctx *) arg->argument->data;
+
+	testsuite_object_emit(cgenv->sblock, ctx->object, ctx->member);
+
+	return TRUE;
+}
+
+/*
+ * Testsuite core object implementation
+ */
+
+static bool tsto_message_set_member
+	(const struct sieve_runtime_env *renv, int id, string_t *value);
+
+static int tsto_envelope_get_member_id(const char *identifier);
+static const char *tsto_envelope_get_member_name(int id);
+static bool tsto_envelope_set_member
+	(const struct sieve_runtime_env *renv, int id, string_t *value);
+
+const struct testsuite_object_def message_testsuite_object = {
+	SIEVE_OBJECT("message",
+		&testsuite_object_operand, TESTSUITE_OBJECT_MESSAGE),
+	.set_member = tsto_message_set_member
+};
+
+const struct testsuite_object_def envelope_testsuite_object = {
+	SIEVE_OBJECT("envelope",
+		&testsuite_object_operand, TESTSUITE_OBJECT_ENVELOPE),
+	.get_member_id = tsto_envelope_get_member_id,
+	.get_member_name = tsto_envelope_get_member_name,
+	.set_member = tsto_envelope_set_member
+};
+
+enum testsuite_object_envelope_field {
+	TESTSUITE_OBJECT_ENVELOPE_FROM,
+	TESTSUITE_OBJECT_ENVELOPE_TO,
+	TESTSUITE_OBJECT_ENVELOPE_ORIG_TO,
+	TESTSUITE_OBJECT_ENVELOPE_AUTH_USER
+};
+
+static bool tsto_message_set_member
+(const struct sieve_runtime_env *renv, int id, string_t *value)
+{
+	if ( id != -1 ) return FALSE;
+
+	testsuite_message_set_string(renv, value);
+
+	return TRUE;
+}
+
+static int tsto_envelope_get_member_id(const char *identifier)
+{
+	if ( strcasecmp(identifier, "from") == 0 )
+		return TESTSUITE_OBJECT_ENVELOPE_FROM;
+	if ( strcasecmp(identifier, "to") == 0 )
+		return TESTSUITE_OBJECT_ENVELOPE_TO;
+	if ( strcasecmp(identifier, "orig_to") == 0 )
+		return TESTSUITE_OBJECT_ENVELOPE_ORIG_TO;
+	if ( strcasecmp(identifier, "auth") == 0 )
+		return TESTSUITE_OBJECT_ENVELOPE_AUTH_USER;
+
+	return -1;
+}
+
+static const char *tsto_envelope_get_member_name(int id)
+{
+	switch ( id ) {
+	case TESTSUITE_OBJECT_ENVELOPE_FROM:
+		return "from";
+	case TESTSUITE_OBJECT_ENVELOPE_TO:
+		return "to";
+	case TESTSUITE_OBJECT_ENVELOPE_ORIG_TO:
+		return "orig_to";
+	case TESTSUITE_OBJECT_ENVELOPE_AUTH_USER:
+		return "auth";
+	}
+
+	return NULL;
+}
+
+static bool tsto_envelope_set_member
+(const struct sieve_runtime_env *renv, int id, string_t *value)
+{
+	switch ( id ) {
+	case TESTSUITE_OBJECT_ENVELOPE_FROM:
+		testsuite_envelope_set_sender(renv, str_c(value));
+		return TRUE;
+	case TESTSUITE_OBJECT_ENVELOPE_TO:
+		testsuite_envelope_set_recipient(renv, str_c(value));
+		return TRUE;
+	case TESTSUITE_OBJECT_ENVELOPE_ORIG_TO:
+		testsuite_envelope_set_orig_recipient(renv, str_c(value));
+		return TRUE;
+	case TESTSUITE_OBJECT_ENVELOPE_AUTH_USER:
+		testsuite_envelope_set_auth_user(renv, str_c(value));
+		return TRUE;
+	}
+
+	return FALSE;
+}
diff --git a/pigeonhole/src/testsuite/testsuite-objects.h b/pigeonhole/src/testsuite/testsuite-objects.h
new file mode 100644
index 0000000..0aa6f4f
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-objects.h
@@ -0,0 +1,83 @@
+#ifndef TESTSUITE_OBJECTS_H
+#define TESTSUITE_OBJECTS_H
+
+#include "sieve-common.h"
+#include "sieve-objects.h"
+
+#include "testsuite-common.h"
+
+/*
+ * Testsuite object operand
+ */
+
+struct testsuite_object_operand_interface {
+	struct sieve_extension_objects testsuite_objects;
+};
+
+extern const struct sieve_operand_class testsuite_object_oprclass;
+
+/*
+ * Testsuite object access
+ */
+
+struct testsuite_object_def {
+	struct sieve_object_def obj_def;
+
+	int (*get_member_id)(const char *identifier);
+	const char *(*get_member_name)(int id);
+
+	bool (*set_member)
+		(const struct sieve_runtime_env *renv, int id, string_t *value);
+	string_t *(*get_member)
+		(const struct sieve_runtime_env *renv, int id);
+};
+
+struct testsuite_object {
+	struct sieve_object object;
+
+	const struct testsuite_object_def *def;
+};
+
+/*
+ * Testsuite object registration
+ */
+
+void testsuite_register_core_objects
+	(struct testsuite_validator_context *ctx);
+void testsuite_object_register
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		const struct testsuite_object_def *tobj_def);
+
+/*
+ * Testsuite object argument
+ */
+
+bool testsuite_object_argument_activate
+	(struct sieve_validator *valdtr, struct sieve_ast_argument *arg,
+		struct sieve_command *cmd);
+
+/*
+ * Testsuite object code
+ */
+
+bool testsuite_object_read
+  (struct sieve_binary_block *sblock, sieve_size_t *address,
+		struct testsuite_object *tobj);
+bool testsuite_object_read_member
+  (struct sieve_binary_block *sblock, sieve_size_t *address,
+		struct testsuite_object *tobj, int *member_id_r);
+
+bool testsuite_object_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+
+const char *testsuite_object_member_name
+	(const struct testsuite_object *object, int member_id);
+
+/*
+ * Testsuite core objects
+ */
+
+extern const struct testsuite_object_def message_testsuite_object;
+extern const struct testsuite_object_def envelope_testsuite_object;
+
+#endif
diff --git a/pigeonhole/src/testsuite/testsuite-result.c b/pigeonhole/src/testsuite/testsuite-result.c
new file mode 100644
index 0000000..51be3ff
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-result.c
@@ -0,0 +1,206 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "ostream.h"
+#include "str.h"
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+#include "sieve-stringlist.h"
+#include "sieve-actions.h"
+#include "sieve-interpreter.h"
+#include "sieve-result.h"
+
+#include "testsuite-common.h"
+#include "testsuite-log.h"
+#include "testsuite-message.h"
+#include "testsuite-mailstore.h"
+
+#include "testsuite-result.h"
+
+struct sieve_execute_env testsuite_execute_env;
+
+static pool_t testsuite_execute_pool = NULL;
+static struct sieve_result *_testsuite_result = NULL;
+static struct sieve_result_execution *_testsuite_rexec = NULL;
+
+void testsuite_result_init(void)
+{
+	struct sieve_instance *svinst = testsuite_sieve_instance;
+
+	testsuite_execute_pool = pool_alloconly_create("sieve execution", 4096);
+
+	sieve_execute_init(&testsuite_execute_env, testsuite_sieve_instance,
+			   testsuite_execute_pool, &testsuite_msgdata,
+			   testsuite_scriptenv, 0);
+
+	_testsuite_result = sieve_result_create(svinst, testsuite_execute_pool,
+						&testsuite_execute_env);
+}
+
+void testsuite_result_deinit(void)
+{
+	sieve_result_execution_destroy(&_testsuite_rexec);
+	if (_testsuite_result != NULL)
+		sieve_result_unref(&_testsuite_result);
+	sieve_execute_deinit(&testsuite_execute_env);
+	pool_unref(&testsuite_execute_pool);
+}
+
+void testsuite_result_reset(const struct sieve_runtime_env *renv)
+{
+	struct sieve_instance *svinst = testsuite_sieve_instance;
+
+	if (_testsuite_result != NULL) {
+		sieve_result_execution_destroy(&_testsuite_rexec);
+		sieve_result_unref(&_testsuite_result);
+		pool_unref(&testsuite_execute_pool);
+	}
+
+	testsuite_message_flush();
+	testsuite_mailstore_flush();
+	i_zero(testsuite_execute_env.exec_status);
+
+	testsuite_execute_pool = pool_alloconly_create("sieve execution", 4096);
+	_testsuite_result = sieve_result_create(svinst, testsuite_execute_pool,
+						&testsuite_execute_env);
+	sieve_interpreter_set_result(renv->interp, _testsuite_result);
+}
+
+struct sieve_result *testsuite_result_get(void)
+{
+	return _testsuite_result;
+}
+
+struct sieve_result_iterate_context *testsuite_result_iterate_init(void)
+{
+	if (_testsuite_result == NULL)
+		return NULL;
+
+	return sieve_result_iterate_init(_testsuite_result);
+}
+
+bool testsuite_result_execute(const struct sieve_runtime_env *renv)
+{
+	int ret;
+
+	if (_testsuite_result == NULL) {
+		sieve_runtime_error(renv, NULL,	"testsuite: "
+				    "trying to execute result, "
+				    "but no result evaluated yet");
+		return FALSE;
+	}
+
+	testsuite_log_clear_messages();
+
+	if (_testsuite_rexec == NULL) {
+		_testsuite_rexec = sieve_result_execution_create(
+			_testsuite_result, testsuite_execute_pool);
+	}
+
+	/* Execute the result */
+	ret = sieve_result_execute(_testsuite_rexec, SIEVE_EXEC_OK, TRUE,
+				   testsuite_log_ehandler, NULL);
+
+	return (ret > 0);
+}
+
+void testsuite_result_print(const struct sieve_runtime_env *renv)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	struct ostream *out;
+
+	out = o_stream_create_fd(1, 0);
+	o_stream_set_no_error_handling(out, TRUE);
+
+	o_stream_nsend_str(out, "\n--");
+	sieve_result_print(_testsuite_result, eenv->scriptenv, out, NULL);
+	o_stream_nsend_str(out, "--\n\n");
+
+	o_stream_destroy(&out);
+}
+
+/*
+ * Result stringlist
+ */
+
+/* Forward declarations */
+
+static int
+testsuite_result_stringlist_next_item(struct sieve_stringlist *_strlist,
+				      string_t **str_r);
+static void
+testsuite_result_stringlist_reset(struct sieve_stringlist *_strlist);
+
+/* Stringlist object */
+
+struct testsuite_result_stringlist {
+	struct sieve_stringlist strlist;
+
+	struct sieve_result_iterate_context *result_iter;
+	int pos, index;
+};
+
+struct sieve_stringlist *
+testsuite_result_stringlist_create(const struct sieve_runtime_env *renv,
+				   int index)
+{
+	struct testsuite_result_stringlist *strlist;
+
+	strlist = t_new(struct testsuite_result_stringlist, 1);
+	strlist->strlist.runenv = renv;
+	strlist->strlist.exec_status = SIEVE_EXEC_OK;
+	strlist->strlist.next_item = testsuite_result_stringlist_next_item;
+	strlist->strlist.reset = testsuite_result_stringlist_reset;
+
+	strlist->result_iter = testsuite_result_iterate_init();
+ 	strlist->index = index;
+	strlist->pos = 0;
+
+	return &strlist->strlist;
+}
+
+static int
+testsuite_result_stringlist_next_item(struct sieve_stringlist *_strlist,
+				      string_t **str_r)
+{
+	struct testsuite_result_stringlist *strlist =
+		(struct testsuite_result_stringlist *)_strlist;
+	const struct sieve_action *action;
+	const char *act_name;
+	bool keep;
+
+	*str_r = NULL;
+
+	if (strlist->index > 0 && strlist->pos > 0)
+		return 0;
+
+	do {
+		if ((action = sieve_result_iterate_next(strlist->result_iter,
+							&keep)) == NULL)
+			return 0;
+
+		strlist->pos++;
+	} while (strlist->pos < strlist->index);
+
+	if (keep)
+		act_name = "keep";
+	else {
+		act_name = ((action == NULL || action->def == NULL ||
+			     action->def->name == NULL) ?
+			    "" : action->def->name);
+	}
+
+	*str_r = t_str_new_const(act_name, strlen(act_name));
+	return 1;
+}
+
+static void testsuite_result_stringlist_reset(struct sieve_stringlist *_strlist)
+{
+	struct testsuite_result_stringlist *strlist =
+		(struct testsuite_result_stringlist *)_strlist;
+
+	strlist->result_iter = testsuite_result_iterate_init();
+	strlist->pos = 0;
+}
diff --git a/pigeonhole/src/testsuite/testsuite-result.h b/pigeonhole/src/testsuite/testsuite-result.h
new file mode 100644
index 0000000..3e232d2
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-result.h
@@ -0,0 +1,25 @@
+#ifndef TESTSUITE_RESULT_H
+#define TESTSUITE_RESULT_H
+
+#include "sieve-execute.h"
+
+extern struct sieve_execute_env testsuite_execute_env;
+
+void testsuite_result_init(void);
+void testsuite_result_deinit(void);
+
+void testsuite_result_reset(const struct sieve_runtime_env *renv);
+
+struct sieve_result *testsuite_result_get(void);
+
+struct sieve_result_iterate_context *testsuite_result_iterate_init(void);
+
+bool testsuite_result_execute(const struct sieve_runtime_env *renv);
+
+void testsuite_result_print(const struct sieve_runtime_env *renv ATTR_UNUSED);
+
+struct sieve_stringlist *
+testsuite_result_stringlist_create(const struct sieve_runtime_env *renv,
+				   int index);
+
+#endif
diff --git a/pigeonhole/src/testsuite/testsuite-script.c b/pigeonhole/src/testsuite/testsuite-script.c
new file mode 100644
index 0000000..b6edd9b
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-script.c
@@ -0,0 +1,256 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+
+#include "sieve.h"
+#include "sieve-common.h"
+#include "sieve-script.h"
+#include "sieve-binary.h"
+#include "sieve-interpreter.h"
+#include "sieve-runtime-trace.h"
+#include "sieve-result.h"
+
+#include "testsuite-common.h"
+#include "testsuite-settings.h"
+#include "testsuite-log.h"
+#include "testsuite-smtp.h"
+#include "testsuite-result.h"
+
+#include "testsuite-script.h"
+
+/*
+ * Tested script environment
+ */
+
+void testsuite_script_init(void)
+{
+}
+
+void testsuite_script_deinit(void)
+{
+}
+
+static struct sieve_binary *
+_testsuite_script_compile(const struct sieve_runtime_env *renv,
+			  const char *script)
+{
+	struct sieve_instance *svinst = testsuite_sieve_instance;
+	struct sieve_binary *sbin;
+	const char *script_path;
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+			    "compile script `%s'", script);
+
+	script_path = sieve_file_script_get_dirpath(renv->script);
+	if (script_path == NULL)
+		return NULL;
+
+	script_path = t_strconcat(script_path, "/", script, NULL);
+	if ((sbin = sieve_compile(svinst, script_path, NULL,
+				  testsuite_log_ehandler, 0, NULL)) == NULL)
+		return NULL;
+
+	return sbin;
+}
+
+bool testsuite_script_compile(const struct sieve_runtime_env *renv,
+			      const char *script)
+{
+	struct testsuite_interpreter_context *ictx =
+		testsuite_interpreter_context_get(renv->interp, testsuite_ext);
+	struct sieve_binary *sbin;
+
+	i_assert(ictx != NULL);
+	testsuite_log_clear_messages();
+
+	if ((sbin = _testsuite_script_compile(renv, script)) == NULL)
+		return FALSE;
+
+	sieve_binary_unref(&ictx->compiled_script);
+
+	ictx->compiled_script = sbin;
+	return TRUE;
+}
+
+bool testsuite_script_is_subtest(const struct sieve_runtime_env *renv)
+{
+	struct testsuite_interpreter_context *ictx =
+		testsuite_interpreter_context_get(renv->interp, testsuite_ext);
+
+	i_assert(ictx != NULL);
+	if (ictx->compiled_script == NULL)
+		return FALSE;
+
+	return (sieve_binary_extension_get_index(ictx->compiled_script,
+						 testsuite_ext) >= 0);
+}
+
+bool testsuite_script_run(const struct sieve_runtime_env *renv)
+{
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	const struct sieve_script_env *senv = eenv->scriptenv;
+	struct testsuite_interpreter_context *ictx =
+		testsuite_interpreter_context_get(renv->interp, testsuite_ext);
+	struct sieve_script_env scriptenv;
+	struct sieve_exec_status exec_status;
+	struct sieve_result *result;
+	struct sieve_interpreter *interp;
+	pool_t pool;
+	struct sieve_execute_env exec_env;
+	const char *error;
+	int ret;
+
+	i_assert(ictx != NULL);
+
+	if (ictx->compiled_script == NULL) {
+		sieve_runtime_error(renv, NULL, "testsuite: "
+			"trying to run script, but no script compiled yet");
+		return FALSE;
+	}
+
+	testsuite_log_clear_messages();
+
+	i_zero(&exec_status);
+
+	/* Compose script execution environment */
+	if (sieve_script_env_init(&scriptenv, senv->user, &error) < 0) {
+		sieve_runtime_error(renv, NULL,	"testsuite: "
+			"failed to initialize script execution: %s", error);
+		return FALSE;
+	}
+	scriptenv.default_mailbox = "INBOX";
+	scriptenv.smtp_start = testsuite_smtp_start;
+	scriptenv.smtp_add_rcpt = testsuite_smtp_add_rcpt;
+	scriptenv.smtp_send = testsuite_smtp_send;
+	scriptenv.smtp_abort = testsuite_smtp_abort;
+	scriptenv.smtp_finish = testsuite_smtp_finish;
+	scriptenv.duplicate_mark = NULL;
+	scriptenv.duplicate_check = NULL;
+	scriptenv.trace_log = eenv->scriptenv->trace_log;
+	scriptenv.trace_config = eenv->scriptenv->trace_config;
+
+	result = testsuite_result_get();
+
+	pool = pool_alloconly_create("sieve execution", 4096);
+	sieve_execute_init(&exec_env, eenv->svinst, pool, eenv->msgdata,
+			   &scriptenv, eenv->flags);
+	pool_unref(&pool);
+
+	/* Execute the script */
+	interp = sieve_interpreter_create(ictx->compiled_script, NULL,
+					  &exec_env, testsuite_log_ehandler);
+
+	if (interp == NULL) {
+		sieve_execute_deinit(&exec_env);
+		return FALSE;
+	}
+
+	ret = sieve_interpreter_run(interp, result);
+	sieve_interpreter_free(&interp);
+
+	sieve_execute_finish(&exec_env, ret);
+	sieve_execute_deinit(&exec_env);
+
+	return (ret > 0 ||
+		sieve_binary_extension_get_index(ictx->compiled_script,
+						 testsuite_ext) >= 0);
+}
+
+struct sieve_binary *
+testsuite_script_get_binary(const struct sieve_runtime_env *renv)
+{
+	struct testsuite_interpreter_context *ictx =
+		testsuite_interpreter_context_get(renv->interp, testsuite_ext);
+
+	i_assert(ictx != NULL);
+	return ictx->compiled_script;
+}
+
+void testsuite_script_set_binary(const struct sieve_runtime_env *renv,
+				 struct sieve_binary *sbin)
+{
+	struct testsuite_interpreter_context *ictx =
+		testsuite_interpreter_context_get(renv->interp, testsuite_ext);
+
+	i_assert(ictx != NULL);
+
+	sieve_binary_unref(&ictx->compiled_script);
+
+	ictx->compiled_script = sbin;
+	sieve_binary_ref(sbin);
+}
+
+/*
+ * Multiscript
+ */
+
+bool testsuite_script_multiscript(const struct sieve_runtime_env *renv,
+				  ARRAY_TYPE (const_string) *scriptfiles)
+{
+	struct sieve_instance *svinst = testsuite_sieve_instance;
+	const struct sieve_execute_env *eenv = renv->exec_env;
+	const struct sieve_script_env *senv = eenv->scriptenv;
+	struct sieve_script_env scriptenv;
+	struct sieve_exec_status exec_status;
+	struct sieve_multiscript *mscript;
+	const char *const *scripts;
+	const char *error;
+	unsigned int count, i;
+	bool more = TRUE;
+	bool result = TRUE;
+
+	testsuite_log_clear_messages();
+
+	/* Compose script execution environment */
+	if (sieve_script_env_init(&scriptenv, senv->user, &error) < 0) {
+		sieve_runtime_error(renv, NULL,
+			"testsuite: failed to initialize script execution: %s",
+			error);
+		return FALSE;
+	}
+	scriptenv.default_mailbox = "INBOX";
+	scriptenv.smtp_start = testsuite_smtp_start;
+	scriptenv.smtp_add_rcpt = testsuite_smtp_add_rcpt;
+	scriptenv.smtp_send = testsuite_smtp_send;
+	scriptenv.smtp_abort = testsuite_smtp_abort;
+	scriptenv.smtp_finish = testsuite_smtp_finish;
+	scriptenv.duplicate_mark = NULL;
+	scriptenv.duplicate_check = NULL;
+	scriptenv.trace_log = eenv->scriptenv->trace_log;
+	scriptenv.trace_config = eenv->scriptenv->trace_config;
+	scriptenv.exec_status = &exec_status;
+
+	/* Start execution */
+
+	mscript = sieve_multiscript_start_execute(svinst, eenv->msgdata,
+						  &scriptenv);
+
+	/* Execute scripts before main script */
+
+	scripts = array_get(scriptfiles, &count);
+	for (i = 0; i < count && more; i++) {
+		struct sieve_binary *sbin = NULL;
+		const char *script = scripts[i];
+
+		/* Open */
+		if ((sbin = _testsuite_script_compile(renv, script)) == NULL) {
+			result = FALSE;
+			break;
+		}
+
+		/* Execute */
+
+		sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+				    "run script `%s'", script);
+
+		more = sieve_multiscript_run(mscript, sbin,
+					     testsuite_log_ehandler,
+					     testsuite_log_ehandler, 0);
+
+		sieve_close(&sbin);
+	}
+
+	return (sieve_multiscript_finish(&mscript, testsuite_log_ehandler,
+					 0, SIEVE_EXEC_OK) > 0 && result);
+}
diff --git a/pigeonhole/src/testsuite/testsuite-script.h b/pigeonhole/src/testsuite/testsuite-script.h
new file mode 100644
index 0000000..547fdfc
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-script.h
@@ -0,0 +1,22 @@
+#ifndef TESTSUITE_SCRIPT_H
+#define TESTSUITE_SCRIPT_H
+
+#include "sieve-common.h"
+
+void testsuite_script_init(void);
+void testsuite_script_deinit(void);
+
+bool testsuite_script_is_subtest(const struct sieve_runtime_env *renv);
+
+bool testsuite_script_compile(const struct sieve_runtime_env *renv,
+			      const char *script);
+bool testsuite_script_run(const struct sieve_runtime_env *renv);
+bool testsuite_script_multiscript(const struct sieve_runtime_env *renv,
+				  ARRAY_TYPE (const_string) *scriptfiles);
+
+struct sieve_binary *
+testsuite_script_get_binary(const struct sieve_runtime_env *renv);
+void testsuite_script_set_binary(const struct sieve_runtime_env *renv,
+				 struct sieve_binary *sbin);
+
+#endif
diff --git a/pigeonhole/src/testsuite/testsuite-settings.c b/pigeonhole/src/testsuite/testsuite-settings.c
new file mode 100644
index 0000000..9d3c872
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-settings.c
@@ -0,0 +1,96 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "hash.h"
+#include "imem.h"
+#include "strfuncs.h"
+#include "mail-user.h"
+
+#include "sieve-common.h"
+
+#include "testsuite-common.h"
+#include "testsuite-mailstore.h"
+#include "testsuite-settings.h"
+
+struct testsuite_setting {
+	char *identifier;
+	char *value;
+};
+
+static HASH_TABLE(const char *, struct testsuite_setting *) settings;
+
+static const char *testsuite_setting_get
+	(void *context, const char *identifier);
+
+void testsuite_settings_init(void)
+{
+	hash_table_create(&settings, default_pool, 0, str_hash, strcmp);
+
+	sieve_tool_set_setting_callback(sieve_tool, testsuite_setting_get, NULL);
+}
+
+void testsuite_settings_deinit(void)
+{
+	struct hash_iterate_context *itx =
+		hash_table_iterate_init(settings);
+	const char *key;
+	struct testsuite_setting *setting;
+
+	while ( hash_table_iterate(itx, settings, &key, &setting) ) {
+		i_free(setting->identifier);
+		i_free(setting->value);
+		i_free(setting);
+	}
+
+	hash_table_iterate_deinit(&itx);
+
+	hash_table_destroy(&settings);
+}
+
+static const char *testsuite_setting_get
+(void *context ATTR_UNUSED, const char *identifier)
+{
+	struct testsuite_setting *setting;
+	struct mail_user *user;
+
+	setting = hash_table_lookup(settings, identifier);
+	if ( setting != NULL )
+		return setting->value;
+
+	user = testsuite_mailstore_get_user();
+	if ( user == NULL )
+		return NULL;
+	return mail_user_plugin_getenv(user, identifier);
+}
+
+void testsuite_setting_set(const char *identifier, const char *value)
+{
+	struct testsuite_setting *setting =
+		hash_table_lookup(settings, identifier);
+
+	if ( setting != NULL ) {
+		i_free(setting->value);
+		setting->value = i_strdup(value);
+	} else {
+		setting = i_new(struct testsuite_setting, 1);
+		setting->identifier = i_strdup(identifier);
+		setting->value = i_strdup(value);
+
+		hash_table_insert(settings, identifier, setting);
+	}
+}
+
+void testsuite_setting_unset(const char *identifier)
+{
+	struct testsuite_setting *setting =
+		hash_table_lookup(settings, identifier);
+
+	if ( setting != NULL ) {
+		i_free(setting->identifier);
+		i_free(setting->value);
+		i_free(setting);
+
+		hash_table_remove(settings, identifier);
+	}
+}
diff --git a/pigeonhole/src/testsuite/testsuite-settings.h b/pigeonhole/src/testsuite/testsuite-settings.h
new file mode 100644
index 0000000..b84e620
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-settings.h
@@ -0,0 +1,12 @@
+#ifndef TESTSUITE_SETTINGS_H
+#define TESTSUITE_SETTINGS_H
+
+#include "sieve-common.h"
+
+void testsuite_settings_init(void);
+void testsuite_settings_deinit(void);
+
+void testsuite_setting_set(const char *identifier, const char *value);
+void testsuite_setting_unset(const char *identifier);
+
+#endif
diff --git a/pigeonhole/src/testsuite/testsuite-smtp.c b/pigeonhole/src/testsuite/testsuite-smtp.c
new file mode 100644
index 0000000..0eb40ac
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-smtp.c
@@ -0,0 +1,176 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "array.h"
+#include "ostream.h"
+#include "unlink-directory.h"
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+#include "sieve-interpreter.h"
+
+#include "testsuite-message.h"
+#include "testsuite-common.h"
+#include "testsuite-smtp.h"
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+struct testsuite_smtp_message {
+	const struct smtp_address *envelope_from, *envelope_to;
+	const char *file;
+};
+
+static pool_t testsuite_smtp_pool;
+static const char *testsuite_smtp_tmp;
+static ARRAY(struct testsuite_smtp_message) testsuite_smtp_messages;
+
+/*
+ * Initialize
+ */
+
+void testsuite_smtp_init(void)
+{
+	pool_t pool;
+
+	testsuite_smtp_pool = pool = pool_alloconly_create("testsuite_smtp", 8192);
+
+	testsuite_smtp_tmp = p_strconcat
+		(pool, testsuite_tmp_dir_get(), "/smtp", NULL);
+
+	if ( mkdir(testsuite_smtp_tmp, 0700) < 0 ) {
+		i_fatal("failed to create temporary directory '%s': %m.",
+			testsuite_smtp_tmp);
+	}
+
+	p_array_init(&testsuite_smtp_messages, pool, 16);
+}
+
+void testsuite_smtp_deinit(void)
+{
+	const char *error;
+
+	if ( unlink_directory(testsuite_smtp_tmp, UNLINK_DIRECTORY_FLAG_RMDIR, &error) < 0 )
+		i_warning("failed to remove temporary directory '%s': %s.",
+			testsuite_smtp_tmp, error);
+
+	pool_unref(&testsuite_smtp_pool);
+}
+
+void testsuite_smtp_reset(void)
+{
+	testsuite_smtp_deinit();
+	testsuite_smtp_init();
+}
+
+/*
+ * Simulated SMTP out
+ */
+
+struct testsuite_smtp {
+	char *msg_file;
+	struct smtp_address *mail_from;
+	struct ostream *output;
+};
+
+void *testsuite_smtp_start
+(const struct sieve_script_env *senv ATTR_UNUSED,
+	const struct smtp_address *mail_from)
+{
+	struct testsuite_smtp *smtp;
+	unsigned int smtp_count = array_count(&testsuite_smtp_messages);
+	int fd;
+
+	smtp = i_new(struct testsuite_smtp, 1);
+
+	smtp->msg_file = i_strdup_printf("%s/%d.eml", testsuite_smtp_tmp, smtp_count);
+	smtp->mail_from = smtp_address_clone(default_pool, mail_from);
+	
+	if ( (fd=open(smtp->msg_file, O_WRONLY | O_CREAT, 0600)) < 0 ) {
+		i_fatal("failed create tmp file for SMTP simulation: open(%s) failed: %m",
+			smtp->msg_file);
+	}
+
+	smtp->output = o_stream_create_fd_autoclose(&fd, (size_t)-1);
+
+	return (void *) smtp;
+}
+
+void testsuite_smtp_add_rcpt
+(const struct sieve_script_env *senv ATTR_UNUSED,
+	void *handle, const struct smtp_address *rcpt_to)
+{
+	struct testsuite_smtp *smtp = (struct testsuite_smtp *) handle;
+	struct testsuite_smtp_message *msg;
+
+	msg = array_append_space(&testsuite_smtp_messages);
+
+	msg->file = p_strdup(testsuite_smtp_pool, smtp->msg_file);
+	msg->envelope_from = smtp_address_clone(testsuite_smtp_pool, smtp->mail_from);
+	msg->envelope_to = smtp_address_clone(testsuite_smtp_pool, rcpt_to);
+}
+
+struct ostream *testsuite_smtp_send
+(const struct sieve_script_env *senv ATTR_UNUSED, void *handle)
+{
+	struct testsuite_smtp *smtp = (struct testsuite_smtp *) handle;
+
+	return smtp->output;
+}
+
+void testsuite_smtp_abort
+(const struct sieve_script_env *senv ATTR_UNUSED,
+	void *handle)
+{
+	struct testsuite_smtp *smtp = (struct testsuite_smtp *) handle;
+
+	o_stream_ignore_last_errors(smtp->output);
+	o_stream_unref(&smtp->output);
+	i_unlink(smtp->msg_file);
+	i_free(smtp->msg_file);
+	i_free(smtp->mail_from);
+	i_free(smtp);
+}
+
+int testsuite_smtp_finish
+(const struct sieve_script_env *senv ATTR_UNUSED,
+	void *handle, const char **error_r ATTR_UNUSED)
+{
+	struct testsuite_smtp *smtp = (struct testsuite_smtp *) handle;
+	int ret = 1;
+
+	if (o_stream_finish(smtp->output) < 0) {
+		i_error("write(%s) failed: %s", smtp->msg_file,
+			o_stream_get_error(smtp->output));
+		ret = -1;
+	}
+	o_stream_unref(&smtp->output);
+	i_free(smtp->msg_file);
+	i_free(smtp->mail_from);
+	i_free(smtp);
+	return ret;
+}
+
+/*
+ * Access
+ */
+
+bool testsuite_smtp_get
+(const struct sieve_runtime_env *renv, unsigned int index)
+{
+	const struct testsuite_smtp_message *smtp_msg;
+
+	if ( index >= array_count(&testsuite_smtp_messages) )
+		return FALSE;
+
+	smtp_msg = array_idx(&testsuite_smtp_messages, index);
+
+	testsuite_message_set_file(renv, smtp_msg->file);
+	testsuite_envelope_set_sender_address(renv, smtp_msg->envelope_from);
+	testsuite_envelope_set_recipient_address(renv, smtp_msg->envelope_to);
+
+	return TRUE;
+}
diff --git a/pigeonhole/src/testsuite/testsuite-smtp.h b/pigeonhole/src/testsuite/testsuite-smtp.h
new file mode 100644
index 0000000..0b120b2
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-smtp.h
@@ -0,0 +1,35 @@
+#ifndef TESTSUITE_SMTP_H
+#define TESTSUITE_SMTP_H
+
+void testsuite_smtp_init(void);
+void testsuite_smtp_deinit(void);
+void testsuite_smtp_reset(void);
+
+/*
+ * Simulated SMTP out
+ */
+
+void *testsuite_smtp_start
+	(const struct sieve_script_env *senv ATTR_UNUSED,
+		const struct smtp_address *mail_from);
+void testsuite_smtp_add_rcpt
+	(const struct sieve_script_env *senv ATTR_UNUSED,
+		void *handle, const struct smtp_address *rcpt_to);
+struct ostream *testsuite_smtp_send
+	(const struct sieve_script_env *senv ATTR_UNUSED,
+		void *handle);
+void testsuite_smtp_abort
+	(const struct sieve_script_env *senv ATTR_UNUSED,
+		void *handle);
+int testsuite_smtp_finish
+	(const struct sieve_script_env *senv ATTR_UNUSED,
+		void *handle, const char **error_r);
+
+/*
+ * Access
+ */
+
+bool testsuite_smtp_get
+	(const struct sieve_runtime_env *renv, unsigned int index);
+
+#endif
diff --git a/pigeonhole/src/testsuite/testsuite-substitutions.c b/pigeonhole/src/testsuite/testsuite-substitutions.c
new file mode 100644
index 0000000..b165587
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-substitutions.c
@@ -0,0 +1,253 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+
+#include "sieve.h"
+#include "sieve-code.h"
+#include "sieve-commands.h"
+#include "sieve-binary.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "testsuite-common.h"
+#include "testsuite-substitutions.h"
+
+/*
+ * Forward declarations
+ */
+
+void testsuite_opr_substitution_emit
+	(struct sieve_binary_block *sblock, const struct testsuite_substitution *tsub,
+		const char *param);
+
+/*
+ * Testsuite substitutions
+ */
+
+/* FIXME: make this extendible */
+
+enum {
+	TESTSUITE_SUBSTITUTION_FILE,
+};
+
+static const struct testsuite_substitution_def testsuite_file_substitution;
+
+static const struct testsuite_substitution_def *substitutions[] = {
+	&testsuite_file_substitution,
+};
+
+static const unsigned int substitutions_count = N_ELEMENTS(substitutions);
+
+static inline const struct testsuite_substitution_def *
+testsuite_substitution_get
+(unsigned int code)
+{
+	if ( code >= substitutions_count )
+		return NULL;
+
+	return substitutions[code];
+}
+
+static const struct testsuite_substitution *testsuite_substitution_create
+(struct sieve_ast *ast, const char *identifier)
+{
+	unsigned int i;
+
+	for ( i = 0; i < substitutions_count; i++ ) {
+		if ( strcasecmp(substitutions[i]->obj_def.identifier, identifier) == 0 ) {
+			const struct testsuite_substitution_def *tsub_def = substitutions[i];
+			struct testsuite_substitution *tsub;
+
+			tsub = p_new(sieve_ast_pool(ast), struct testsuite_substitution, 1);
+			tsub->object.def = &tsub_def->obj_def;
+			tsub->object.ext = testsuite_ext;
+			tsub->def = tsub_def;
+
+			return tsub;
+		}
+	}
+
+	return NULL;
+}
+
+/*
+ * Substitution argument
+ */
+
+static bool arg_testsuite_substitution_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+		struct sieve_command *context);
+
+struct _testsuite_substitution_context {
+	const struct testsuite_substitution *tsub;
+	const char *param;
+};
+
+const struct sieve_argument_def testsuite_substitution_argument = {
+	.identifier = "@testsuite-substitution",
+	.generate = arg_testsuite_substitution_generate
+};
+
+struct sieve_ast_argument *testsuite_substitution_argument_create
+(struct sieve_validator *valdtr ATTR_UNUSED, struct sieve_ast *ast,
+	unsigned int source_line, const char *substitution, const char *param)
+{
+	const struct testsuite_substitution *tsub;
+	struct _testsuite_substitution_context *tsctx;
+	struct sieve_ast_argument *arg;
+	pool_t pool;
+
+	tsub = testsuite_substitution_create(ast, substitution);
+	if ( tsub == NULL )
+		return NULL;
+
+	arg = sieve_ast_argument_create(ast, source_line);
+	arg->type = SAAT_STRING;
+
+	pool = sieve_ast_pool(ast);
+	tsctx = p_new(pool, struct _testsuite_substitution_context, 1);
+	tsctx->tsub = tsub;
+	tsctx->param = p_strdup(pool, param);
+
+	arg->argument = sieve_argument_create
+		(ast, &testsuite_substitution_argument, testsuite_ext, 0);
+	arg->argument->data = (void *) tsctx;
+
+	return arg;
+}
+
+static bool arg_testsuite_substitution_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_ast_argument *arg,
+	struct sieve_command *context ATTR_UNUSED)
+{
+	struct _testsuite_substitution_context *tsctx =
+		(struct _testsuite_substitution_context *) arg->argument->data;
+
+	testsuite_opr_substitution_emit(cgenv->sblock, tsctx->tsub, tsctx->param);
+
+	return TRUE;
+}
+
+/*
+ * Substitution operand
+ */
+
+static bool opr_substitution_dump
+	(const struct sieve_dumptime_env *denv, const struct sieve_operand *oprnd,
+		sieve_size_t *address);
+static int opr_substitution_read_value
+	(const struct sieve_runtime_env *renv, const struct sieve_operand *oprnd,
+		sieve_size_t *address, string_t **str);
+
+const struct sieve_opr_string_interface testsuite_substitution_interface = {
+	opr_substitution_dump,
+	opr_substitution_read_value
+};
+
+const struct sieve_operand_def testsuite_substitution_operand = {
+	.name = "test-substitution",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERAND_SUBSTITUTION,
+	.class = &string_class,
+	.interface = &testsuite_substitution_interface
+};
+
+void testsuite_opr_substitution_emit
+(struct sieve_binary_block *sblock, const struct testsuite_substitution *tsub,
+	const char *param)
+{
+	/* Default variable storage */
+	(void) sieve_operand_emit
+		(sblock, testsuite_ext, &testsuite_substitution_operand);
+	(void) sieve_binary_emit_unsigned(sblock, tsub->object.def->code);
+	(void) sieve_binary_emit_cstring(sblock, param);
+}
+
+static bool opr_substitution_dump
+(const struct sieve_dumptime_env *denv, const struct sieve_operand *oprnd,
+	sieve_size_t *address)
+{
+	unsigned int code = 0;
+	const struct testsuite_substitution_def *tsub;
+	string_t *param;
+
+	if ( !sieve_binary_read_unsigned(denv->sblock, address, &code) )
+		return FALSE;
+
+	tsub = testsuite_substitution_get(code);
+	if ( tsub == NULL )
+		return FALSE;
+
+	if ( !sieve_binary_read_string(denv->sblock, address, &param) )
+		return FALSE;
+
+	if ( oprnd->field_name != NULL )
+		sieve_code_dumpf(denv, "%s: TEST_SUBS %%{%s:%s}",
+			oprnd->field_name, tsub->obj_def.identifier, str_c(param));
+	else
+		sieve_code_dumpf(denv, "TEST_SUBS %%{%s:%s}",
+			tsub->obj_def.identifier, str_c(param));
+	return TRUE;
+}
+
+static int opr_substitution_read_value
+(const struct sieve_runtime_env *renv,
+	const struct sieve_operand *oprnd ATTR_UNUSED, sieve_size_t *address,
+	string_t **str_r)
+{
+	const struct testsuite_substitution_def *tsub;
+	unsigned int code = 0;
+	string_t *param;
+
+	if ( !sieve_binary_read_unsigned(renv->sblock, address, &code) )
+		return SIEVE_EXEC_BIN_CORRUPT;
+
+	tsub = testsuite_substitution_get(code);
+	if ( tsub == NULL )
+		return SIEVE_EXEC_FAILURE;
+
+	/* Parameter str can be NULL if we are requested to only skip and not
+	 * actually read the argument.
+	 */
+	if ( str_r == NULL ) {
+		if ( !sieve_binary_read_string(renv->sblock, address, NULL) )
+			return SIEVE_EXEC_BIN_CORRUPT;
+
+		return SIEVE_EXEC_OK;
+	}
+
+	if ( !sieve_binary_read_string(renv->sblock, address, &param) )
+		return SIEVE_EXEC_BIN_CORRUPT;
+
+	if ( !tsub->get_value(str_c(param), str_r) )
+		return SIEVE_EXEC_FAILURE;
+
+	return SIEVE_EXEC_OK;
+}
+
+/*
+ * Testsuite substitution definitions
+ */
+
+static bool testsuite_file_substitution_get_value
+	(const char *param, string_t **result);
+
+static const struct testsuite_substitution_def
+testsuite_file_substitution = {
+	SIEVE_OBJECT("file",
+		&testsuite_substitution_operand,
+		TESTSUITE_SUBSTITUTION_FILE),
+	.get_value = testsuite_file_substitution_get_value
+};
+
+static bool testsuite_file_substitution_get_value
+(const char *param, string_t **result)
+{
+	*result = t_str_new(256);
+
+	str_printfa(*result, "[FILE: %s]", param);
+	return TRUE;
+}
+
diff --git a/pigeonhole/src/testsuite/testsuite-substitutions.h b/pigeonhole/src/testsuite/testsuite-substitutions.h
new file mode 100644
index 0000000..8b256d0
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-substitutions.h
@@ -0,0 +1,23 @@
+#ifndef TESTSUITE_SUBSTITUTIONS_H
+#define TESTSUITE_SUBSTITUTIONS_H
+
+#include "sieve-common.h"
+#include "sieve-objects.h"
+
+struct testsuite_substitution_def {
+	struct sieve_object_def obj_def;
+
+	bool (*get_value)(const char *param, string_t **result);
+};
+
+struct testsuite_substitution {
+	struct sieve_object object;
+
+	const struct testsuite_substitution_def *def;
+};
+
+struct sieve_ast_argument *testsuite_substitution_argument_create
+	(struct sieve_validator *valdtr, struct sieve_ast *ast,
+		unsigned int source_line, const char *substitution, const char *param);
+
+#endif
diff --git a/pigeonhole/src/testsuite/testsuite-variables.c b/pigeonhole/src/testsuite/testsuite-variables.c
new file mode 100644
index 0000000..f644393
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-variables.c
@@ -0,0 +1,183 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+
+#include "sieve-common.h"
+#include "sieve-ast.h"
+#include "sieve-binary.h"
+#include "sieve-code.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-dump.h"
+
+#include "sieve-ext-variables.h"
+
+#include "testsuite-common.h"
+#include "testsuite-variables.h"
+
+/*
+ *
+ */
+
+static const struct sieve_extension *testsuite_ext_variables = NULL;
+
+/*
+ *
+ */
+
+bool testsuite_varnamespace_validate
+	(struct sieve_validator *valdtr, const struct sieve_variables_namespace *nspc,
+		struct sieve_ast_argument *arg, struct sieve_command *cmd,
+		ARRAY_TYPE(sieve_variable_name) *var_name, void **var_data,
+		bool assignment);
+bool testsuite_varnamespace_generate
+	(const struct sieve_codegen_env *cgenv,
+		const struct sieve_variables_namespace *nspc,
+		struct sieve_ast_argument *arg, struct sieve_command *cmd, void *var_data);
+bool testsuite_varnamespace_dump_variable
+	(const struct sieve_dumptime_env *denv,
+		const struct sieve_variables_namespace *nspc,
+		const struct sieve_operand *oprnd, sieve_size_t *address);
+int testsuite_varnamespace_read_variable
+	(const struct sieve_runtime_env *renv,
+		const struct sieve_variables_namespace *nspc,
+		const struct sieve_operand *oprnd, sieve_size_t *address, string_t **str_r);
+
+static const struct sieve_variables_namespace_def testsuite_namespace = {
+	SIEVE_OBJECT("tst", &testsuite_namespace_operand, 0),
+	testsuite_varnamespace_validate,
+	testsuite_varnamespace_generate,
+	testsuite_varnamespace_dump_variable,
+	testsuite_varnamespace_read_variable
+};
+
+bool testsuite_varnamespace_validate
+(struct sieve_validator *valdtr,
+	const struct sieve_variables_namespace *nspc ATTR_UNUSED,
+	struct sieve_ast_argument *arg, struct sieve_command *cmd ATTR_UNUSED,
+	ARRAY_TYPE(sieve_variable_name) *var_name, void **var_data,
+	bool assignment)
+{
+	struct sieve_ast *ast = arg->ast;
+	const struct sieve_variable_name *name_element;
+	const char *variable;
+
+	/* Check variable name */
+
+	if ( array_count(var_name) != 2 ) {
+		sieve_argument_validate_error(valdtr, arg,
+			"testsuite: invalid variable name within testsuite namespace: "
+			"encountered sub-namespace");
+		return FALSE;
+ 	}
+
+	name_element = array_idx(var_name, 1);
+	if ( name_element->num_variable >= 0 ) {
+		sieve_argument_validate_error(valdtr, arg,
+			"testsuite: invalid variable name within testsuite namespace 'tst.%d': "
+			"encountered numeric variable name", name_element->num_variable);
+		return FALSE;
+	}
+
+	variable = str_c(name_element->identifier);
+
+	if ( assignment ) {
+		sieve_argument_validate_error(valdtr, arg,
+			"testsuite: cannot assign to testsuite variable 'tst.%s'", variable);
+		return FALSE;
+	}
+
+	*var_data = (void *) p_strdup(sieve_ast_pool(ast), variable);
+
+	return TRUE;
+}
+
+bool testsuite_varnamespace_generate
+(const struct sieve_codegen_env *cgenv,
+	const struct sieve_variables_namespace *nspc,
+	struct sieve_ast_argument *arg ATTR_UNUSED,
+	struct sieve_command *cmd ATTR_UNUSED, void *var_data)
+{
+	const struct sieve_extension *this_ext = SIEVE_OBJECT_EXTENSION(nspc);
+	const char *variable = (const char *) var_data;
+
+	if ( this_ext == NULL )
+		return FALSE;
+
+	sieve_variables_opr_namespace_variable_emit
+		(cgenv->sblock, testsuite_ext_variables, this_ext, &testsuite_namespace);
+	sieve_binary_emit_cstring(cgenv->sblock, variable);
+
+	return TRUE;
+}
+
+bool testsuite_varnamespace_dump_variable
+(const struct sieve_dumptime_env *denv,
+	const struct sieve_variables_namespace *nspc ATTR_UNUSED,
+	const struct sieve_operand *oprnd, sieve_size_t *address)
+{
+	string_t *var_name;
+
+	if ( !sieve_binary_read_string(denv->sblock, address, &var_name) )
+		return FALSE;
+
+	if ( oprnd->field_name != NULL )
+		sieve_code_dumpf(denv, "%s: VAR ${tst.%s}",
+			oprnd->field_name, str_c(var_name));
+	else
+		sieve_code_dumpf(denv, "VAR ${tst.%s}",
+			str_c(var_name));
+
+	return TRUE;
+}
+
+int testsuite_varnamespace_read_variable
+(const struct sieve_runtime_env *renv,
+	const struct sieve_variables_namespace *nspc ATTR_UNUSED,
+	const struct sieve_operand *oprnd, sieve_size_t *address,
+	string_t **str_r)
+{
+	string_t *var_name;
+
+	if ( !sieve_binary_read_string(renv->sblock, address, &var_name) ) {
+		sieve_runtime_trace_operand_error(renv, oprnd,
+			"testsuite variable operand corrupt: invalid name");
+		return SIEVE_EXEC_BIN_CORRUPT;
+	}
+
+	if ( str_r != NULL ) {
+		if ( strcmp(str_c(var_name), "path") == 0 )
+			*str_r = t_str_new_const(testsuite_test_path, strlen(testsuite_test_path));
+		else
+			*str_r = NULL;
+	}
+	return SIEVE_EXEC_OK;
+}
+
+
+/*
+ * Namespace registration
+ */
+
+static const struct sieve_extension_objects testsuite_namespaces =
+	SIEVE_VARIABLES_DEFINE_NAMESPACE(testsuite_namespace);
+
+const struct sieve_operand_def testsuite_namespace_operand = {
+	.name = "testsuite-namespace",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERAND_NAMESPACE,
+	.class =  &sieve_variables_namespace_operand_class,
+	.interface = &testsuite_namespaces
+};
+
+void testsuite_variables_init
+(const struct sieve_extension *this_ext, struct sieve_validator *valdtr)
+{
+	testsuite_ext_variables = sieve_ext_variables_get_extension(this_ext->svinst);
+
+	sieve_variables_namespace_register
+		(testsuite_ext_variables, valdtr, this_ext, &testsuite_namespace);
+}
diff --git a/pigeonhole/src/testsuite/testsuite-variables.h b/pigeonhole/src/testsuite/testsuite-variables.h
new file mode 100644
index 0000000..60f6b18
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite-variables.h
@@ -0,0 +1,11 @@
+#ifndef TESTSUITE_VARIABLES_H
+#define TESTSUITE_VARIABLES_H
+
+extern const struct sieve_operand_def testsuite_namespace_operand;
+
+void testsuite_variables_init
+	(const struct sieve_extension *this_ext, struct sieve_validator *valdtr);
+
+#endif
+
+
diff --git a/pigeonhole/src/testsuite/testsuite.c b/pigeonhole/src/testsuite/testsuite.c
new file mode 100644
index 0000000..2a6b82e
--- /dev/null
+++ b/pigeonhole/src/testsuite/testsuite.c
@@ -0,0 +1,256 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "lib.h"
+#include "lib-signals.h"
+#include "ioloop.h"
+#include "env-util.h"
+#include "ostream.h"
+#include "hostpid.h"
+#include "path-util.h"
+
+#include "sieve.h"
+#include "sieve-extensions.h"
+#include "sieve-script.h"
+#include "sieve-binary.h"
+#include "sieve-result.h"
+#include "sieve-interpreter.h"
+
+#include "sieve-tool.h"
+
+#include "testsuite-common.h"
+#include "testsuite-log.h"
+#include "testsuite-settings.h"
+#include "testsuite-result.h"
+#include "testsuite-message.h"
+#include "testsuite-smtp.h"
+#include "testsuite-mailstore.h"
+
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <pwd.h>
+#include <sysexits.h>
+
+const struct sieve_script_env *testsuite_scriptenv;
+
+/*
+ * Configuration
+ */
+
+#define DEFAULT_SENDMAIL_PATH "/usr/lib/sendmail"
+
+/*
+ * Testsuite execution
+ */
+
+static void print_help(void)
+{
+	printf(
+"Usage: testsuite [-D] [-E] [-F] [-d <dump-filename>]\n"
+"                 [-t <trace-filename>] [-T <trace-option>]\n"
+"                 [-P <plugin>] [-x <extensions>]\n"
+"                 <scriptfile>\n"
+	);
+}
+
+static int
+testsuite_run(struct sieve_binary *sbin, struct sieve_error_handler *ehandler)
+{
+	struct sieve_interpreter *interp;
+	struct sieve_result *result;
+	int ret = 0;
+
+	/* Create the interpreter */
+	interp = sieve_interpreter_create(sbin, NULL, &testsuite_execute_env,
+					  ehandler);
+	if (interp == NULL)
+		return SIEVE_EXEC_BIN_CORRUPT;
+
+	/* Run the interpreter */
+	result = testsuite_result_get();
+	ret = sieve_interpreter_run(interp, result);
+
+	/* Free the interpreter */
+	sieve_interpreter_free(&interp);
+
+	return ret;
+}
+
+int main(int argc, char **argv)
+{
+	struct sieve_instance *svinst;
+	const char *scriptfile, *dumpfile, *tracefile;
+	struct sieve_trace_config trace_config;
+	struct sieve_binary *sbin;
+	const char *sieve_dir, *cwd, *error;
+	bool log_stdout = FALSE, expect_failure = FALSE;
+	int ret, c;
+
+	sieve_tool = sieve_tool_init("testsuite", &argc, &argv,
+				     "d:t:T:EFDP:", TRUE);
+
+	/* Parse arguments */
+	dumpfile = tracefile = NULL;
+	i_zero(&trace_config);
+	trace_config.level = SIEVE_TRLVL_ACTIONS;
+	while ((c = sieve_tool_getopt(sieve_tool)) > 0) {
+		switch (c) {
+		case 'd':
+			/* destination address */
+			dumpfile = optarg;
+			break;
+		case 't':
+			/* trace file */
+			tracefile = optarg;
+			break;
+		case 'T':
+			sieve_tool_parse_trace_option(&trace_config, optarg);
+			break;
+		case 'E':
+			log_stdout = TRUE;
+			break;
+		case 'F':
+			expect_failure = TRUE;
+			break;
+		default:
+			print_help();
+			i_fatal_status(EX_USAGE, "Unknown argument: %c", c);
+			break;
+		}
+	}
+
+	if (optind < argc) {
+		scriptfile = t_strdup(argv[optind++]);
+	} else {
+		print_help();
+		i_fatal_status(EX_USAGE, "Missing <scriptfile> argument");
+	}
+
+	if (optind != argc) {
+		print_help();
+		i_fatal_status(EX_USAGE, "Unknown argument: %s", argv[optind]);
+	}
+
+	// FIXME: very very ugly
+	master_service_parse_option(
+		master_service, 'o',
+		"postmaster_address=postmaster@example.com");
+
+	/* Initialize mail user */
+	if (t_get_working_dir(&cwd, &error) < 0)
+		i_fatal("Failed to get working directory: %s", error);
+	sieve_tool_set_homedir(sieve_tool, cwd);
+
+	/* Initialize settings environment */
+	testsuite_settings_init();
+
+	/* Currently needed for include (FIXME) */
+	sieve_dir = strrchr(scriptfile, '/');
+	if (sieve_dir == NULL)
+		sieve_dir = "./";
+	else
+		sieve_dir = t_strdup_until(scriptfile, sieve_dir+1);
+
+	testsuite_setting_set("sieve_dir",
+			      t_strconcat(sieve_dir, "included", NULL));
+	testsuite_setting_set("sieve_global_dir",
+			      t_strconcat(sieve_dir, "included-global", NULL));
+
+	/* Finish testsuite initialization */
+	svinst = sieve_tool_init_finish(sieve_tool, FALSE, FALSE);
+	testsuite_init(svinst, sieve_dir, log_stdout);
+
+	printf("Test case: %s:\n\n", scriptfile);
+
+	/* Compile sieve script */
+	if ((sbin = sieve_compile(svinst, scriptfile, NULL,
+				  testsuite_log_main_ehandler,
+				  0, NULL)) != NULL) {
+		struct sieve_trace_log *trace_log = NULL;
+		struct sieve_exec_status exec_status;
+		struct sieve_script_env scriptenv;
+
+		/* Dump script */
+		sieve_tool_dump_binary_to(sbin, dumpfile, FALSE);
+
+		if (tracefile != NULL) {
+			(void)sieve_trace_log_create(
+				svinst, (strcmp(tracefile, "-") == 0 ?
+					 NULL : tracefile), &trace_log);
+		}
+
+		testsuite_mailstore_init();
+		testsuite_message_init();
+
+		if (sieve_script_env_init(&scriptenv,
+					  testsuite_mailstore_get_user(),
+					  &error) < 0) {
+			i_fatal("Failed to initialize script execution: %s",
+				error);
+		}
+
+		i_zero(&exec_status);
+
+		scriptenv.default_mailbox = "INBOX";
+		scriptenv.smtp_start = testsuite_smtp_start;
+		scriptenv.smtp_add_rcpt = testsuite_smtp_add_rcpt;
+		scriptenv.smtp_send = testsuite_smtp_send;
+		scriptenv.smtp_abort = testsuite_smtp_abort;
+		scriptenv.smtp_finish = testsuite_smtp_finish;
+		scriptenv.trace_log = trace_log;
+		scriptenv.trace_config = trace_config;
+		scriptenv.exec_status = &exec_status;
+
+		testsuite_scriptenv = &scriptenv;
+
+		testsuite_result_init();
+
+		/* Run the test */
+		ret = testsuite_run(sbin, testsuite_log_main_ehandler);
+
+		switch (ret) {
+		case SIEVE_EXEC_OK:
+			break;
+		case SIEVE_EXEC_FAILURE:
+		case SIEVE_EXEC_KEEP_FAILED:
+		case SIEVE_EXEC_TEMP_FAILURE:
+			testsuite_testcase_fail(
+				"test script execution aborted due to error");
+			break;
+		case SIEVE_EXEC_BIN_CORRUPT:
+			testsuite_testcase_fail(
+				"compiled test script binary is corrupt");
+			break;
+		case SIEVE_EXEC_RESOURCE_LIMIT:
+			testsuite_testcase_fail(
+				"resource limit exceeded");
+			break;
+		}
+
+		sieve_close(&sbin);
+
+		/* De-initialize message environment */
+		testsuite_result_deinit();
+		testsuite_message_deinit();
+		testsuite_mailstore_deinit();
+
+		if (trace_log != NULL)
+			sieve_trace_log_free(&trace_log);
+
+		testsuite_scriptenv = NULL;
+	} else {
+		testsuite_testcase_fail("failed to compile testcase script");
+	}
+
+	/* De-initialize testsuite */
+	testsuite_deinit();
+	testsuite_settings_deinit();
+
+	sieve_tool_deinit(&sieve_tool);
+
+	if (!testsuite_testcase_result(expect_failure))
+		return EXIT_FAILURE;
+
+	return EXIT_SUCCESS;
+}
diff --git a/pigeonhole/src/testsuite/tst-test-error.c b/pigeonhole/src/testsuite/tst-test-error.c
new file mode 100644
index 0000000..f2f2eb9
--- /dev/null
+++ b/pigeonhole/src/testsuite/tst-test-error.c
@@ -0,0 +1,273 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+#include "sieve-script.h"
+#include "sieve-commands.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+#include "sieve-dump.h"
+#include "sieve-match.h"
+
+#include "testsuite-common.h"
+#include "testsuite-log.h"
+
+/*
+ * Test_error command
+ *
+ * Syntax:
+ *   test [MATCH-TYPE] [COMPARATOR] [:index number] <key-list: string-list>
+ */
+
+static bool tst_test_error_registered
+	(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+static bool tst_test_error_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool tst_test_error_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx);
+
+const struct sieve_command_def tst_test_error = {
+	.identifier = "test_error",
+	.type = SCT_TEST,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = tst_test_error_registered,
+	.validate = tst_test_error_validate,
+	.generate = tst_test_error_generate
+};
+
+/*
+ * Operation
+ */
+
+static bool tst_test_error_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int tst_test_error_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def test_error_operation = {
+	.mnemonic = "TEST_ERROR",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_ERROR,
+	.dump = tst_test_error_operation_dump,
+	.execute = tst_test_error_operation_execute
+};
+
+/*
+ * Tagged arguments
+ */
+
+/* NOTE: This will be merged with the date-index extension when it is
+ * implemented.
+ */
+
+static bool tst_test_error_validate_index_tag
+	(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+		struct sieve_command *cmd);
+
+static const struct sieve_argument_def test_error_index_tag = {
+	.identifier = "index",
+	.validate = tst_test_error_validate_index_tag
+};
+
+enum tst_test_error_optional {
+	OPT_INDEX = SIEVE_MATCH_OPT_LAST,
+};
+
+
+/*
+ * Argument implementation
+ */
+
+static bool tst_test_error_validate_index_tag
+(struct sieve_validator *valdtr, struct sieve_ast_argument **arg,
+	struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+
+	/* Detach the tag itself */
+	*arg = sieve_ast_arguments_detach(*arg,1);
+
+	/* Check syntax:
+	 *   :index number
+	 */
+	if ( !sieve_validate_tag_parameter
+		(valdtr, cmd, tag, *arg, NULL, 0, SAAT_NUMBER, FALSE) ) {
+		return FALSE;
+	}
+
+	/* Skip parameter */
+	*arg = sieve_ast_argument_next(*arg);
+	return TRUE;
+}
+
+
+/*
+ * Command registration
+ */
+
+static bool tst_test_error_registered
+(struct sieve_validator *valdtr, const struct sieve_extension *ext,
+	struct sieve_command_registration *cmd_reg)
+{
+	/* The order of these is not significant */
+	sieve_comparators_link_tag(valdtr, cmd_reg, SIEVE_MATCH_OPT_COMPARATOR);
+	sieve_match_types_link_tags(valdtr, cmd_reg, SIEVE_MATCH_OPT_MATCH_TYPE);
+
+	sieve_validator_register_tag
+		(valdtr, cmd_reg, ext, &test_error_index_tag, OPT_INDEX);
+
+	return TRUE;
+}
+
+/*
+ * Validation
+ */
+
+static bool tst_test_error_validate
+(struct sieve_validator *valdtr ATTR_UNUSED, struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+	struct sieve_comparator cmp_default =
+		SIEVE_COMPARATOR_DEFAULT(i_octet_comparator);
+	struct sieve_match_type mcht_default =
+		SIEVE_COMPARATOR_DEFAULT(is_match_type);
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "key list", 2, SAAT_STRING_LIST) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, tst, arg, FALSE) )
+		return FALSE;
+
+	/* Validate the key argument to a specified match type */
+	return sieve_match_type_validate
+		(valdtr, tst, arg, &mcht_default, &cmp_default);
+}
+
+/*
+ * Code generation
+ */
+
+static bool tst_test_error_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *tst)
+{
+	sieve_operation_emit(cgenv->sblock, tst->ext, &test_error_operation);
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, tst, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool tst_test_error_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	int opt_code = 0;
+
+	sieve_code_dumpf(denv, "TEST_ERROR:");
+	sieve_code_descend(denv);
+
+	/* Handle any optional arguments */
+	for (;;) {
+		int opt;
+
+		if ( (opt=sieve_match_opr_optional_dump(denv, address, &opt_code))
+			< 0 )
+			return FALSE;
+
+		if ( opt == 0 ) break;
+
+		if ( opt_code == OPT_INDEX ) {
+			if ( !sieve_opr_number_dump(denv, address, "index") )
+				return FALSE;
+		} else {
+			return FALSE;
+		}
+	}
+
+	return sieve_opr_stringlist_dump(denv, address, "key list");
+}
+
+/*
+ * Intepretation
+ */
+
+static int tst_test_error_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	int opt_code = 0;
+	struct sieve_comparator cmp = SIEVE_COMPARATOR_DEFAULT(i_octet_comparator);
+	struct sieve_match_type mcht = SIEVE_COMPARATOR_DEFAULT(is_match_type);
+	struct sieve_stringlist *value_list, *key_list;
+	int index = -1;
+	int match, ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Read optional operands */
+	for (;;) {
+		sieve_number_t number;
+		int opt;
+
+		if ( (opt=sieve_match_opr_optional_read
+			(renv, address, &opt_code, &ret, &cmp, &mcht)) < 0 )
+			return ret;
+
+		if ( opt == 0 ) break;
+
+		if ( opt_code == OPT_INDEX ) {
+			if ( (ret=sieve_opr_number_read(renv, address, "index", &number)) <= 0 )
+				return ret;
+			index = (int) number;
+		} else {
+			sieve_runtime_trace_error(renv, "invalid optional operand");
+			return SIEVE_EXEC_BIN_CORRUPT;
+		}
+	}
+
+	/* Read key-list */
+	if ( (ret=sieve_opr_stringlist_read(renv, address, "key_list", &key_list))
+		<= 0 )
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	if ( index > 0 )
+		sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+			"testsuite: test_error test; match error message [index=%d]", index);
+	else
+		sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+			"testsuite: test_error test; match error messages");
+
+	/* Create value stringlist */
+	value_list = testsuite_log_stringlist_create(renv, index);
+
+	/* Perform match */
+	if ( (match=sieve_match(renv, &mcht, &cmp, value_list, key_list, &ret)) < 0 )
+		return ret;
+
+	/* Set test result for subsequent conditional jump */
+	sieve_interpreter_set_test_result(renv->interp, match > 0);
+	return SIEVE_EXEC_OK;
+}
+
+
+
+
diff --git a/pigeonhole/src/testsuite/tst-test-multiscript.c b/pigeonhole/src/testsuite/tst-test-multiscript.c
new file mode 100644
index 0000000..b4b2a0e
--- /dev/null
+++ b/pigeonhole/src/testsuite/tst-test-multiscript.c
@@ -0,0 +1,155 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-script.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-stringlist.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+#include "sieve-dump.h"
+#include "sieve.h"
+
+#include "testsuite-common.h"
+#include "testsuite-script.h"
+
+/*
+ * Test_multiscript command
+ *
+ * Syntax:
+ *   test_multiscript <scripts: string-list>
+ */
+
+static bool tst_test_multiscript_validate
+	(struct sieve_validator *validator, struct sieve_command *cmd);
+static bool tst_test_multiscript_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *tst);
+
+const struct sieve_command_def tst_test_multiscript = {
+	.identifier = "test_multiscript",
+	.type = SCT_TEST,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = tst_test_multiscript_validate,
+	.generate = tst_test_multiscript_generate,
+};
+
+/*
+ * Operation
+ */
+
+static bool tst_test_multiscript_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int tst_test_multiscript_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def test_multiscript_operation = {
+	.mnemonic = "TEST_MULTISCRIPT",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_MULTISCRIPT,
+	.dump = tst_test_multiscript_operation_dump,
+	.execute = tst_test_multiscript_operation_execute
+};
+
+/*
+ * Validation
+ */
+
+static bool tst_test_multiscript_validate
+(struct sieve_validator *valdtr, struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "scripts", 1, SAAT_STRING_LIST) ) {
+		return FALSE;
+	}
+
+	return sieve_validator_argument_activate(valdtr, tst, arg, FALSE);
+}
+
+/*
+ * Code generation
+ */
+
+static bool tst_test_multiscript_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *tst)
+{
+	sieve_operation_emit(cgenv->sblock, tst->ext, &test_multiscript_operation);
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, tst, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool tst_test_multiscript_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "TEST_MULTISCRIPT:");
+	sieve_code_descend(denv);
+
+	if ( !sieve_opr_stringlist_dump(denv, address, "scripts") )
+		return FALSE;
+
+	return TRUE;
+}
+
+/*
+ * Intepretation
+ */
+
+static int tst_test_multiscript_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	struct sieve_stringlist *scripts_list;
+	string_t *script_name;
+	ARRAY_TYPE (const_string) scriptfiles;
+	bool result = TRUE;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	if ( (ret=sieve_opr_stringlist_read(renv, address, "scripts", &scripts_list))
+		<= 0 )
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+		"testsuite: test_multiscript test");
+	sieve_runtime_trace_descend(renv);
+
+	t_array_init(&scriptfiles, 16);
+
+	script_name = NULL;
+	while ( result &&
+		(ret=sieve_stringlist_next_item(scripts_list, &script_name)) > 0 ) {
+		const char *script = t_strdup(str_c(script_name));
+
+		array_append(&scriptfiles, &script, 1);
+	}
+
+	result = result && (ret >= 0) &&
+		testsuite_script_multiscript(renv, &scriptfiles);
+
+	/* Set result */
+	sieve_interpreter_set_test_result(renv->interp, result);
+
+	return SIEVE_EXEC_OK;
+}
+
+
+
+
diff --git a/pigeonhole/src/testsuite/tst-test-result-action.c b/pigeonhole/src/testsuite/tst-test-result-action.c
new file mode 100644
index 0000000..75d4a2f
--- /dev/null
+++ b/pigeonhole/src/testsuite/tst-test-result-action.c
@@ -0,0 +1,268 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-error.h"
+#include "sieve-script.h"
+#include "sieve-commands.h"
+#include "sieve-actions.h"
+#include "sieve-comparators.h"
+#include "sieve-match-types.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+#include "sieve-result.h"
+#include "sieve-dump.h"
+#include "sieve-match.h"
+
+#include "testsuite-common.h"
+#include "testsuite-result.h"
+
+/*
+ * test_result_action command
+ *
+ * Syntax:
+ *   test_result_action [MATCH-TYPE] [COMPARATOR] [:index number]
+ *     <key-list: string-list>
+ */
+
+static bool tst_test_result_action_registered
+	(struct sieve_validator *validator, const struct sieve_extension *ext,
+		struct sieve_command_registration *cmd_reg);
+static bool tst_test_result_action_validate
+	(struct sieve_validator *validator, struct sieve_command *cmd);
+static bool tst_test_result_action_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *ctx);
+
+const struct sieve_command_def tst_test_result_action = {
+	.identifier = "test_result_action",
+	.type = SCT_TEST,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = tst_test_result_action_registered,
+	.validate = tst_test_result_action_validate,
+	.generate = tst_test_result_action_generate
+};
+
+/*
+ * Operation
+ */
+
+static bool tst_test_result_action_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int tst_test_result_action_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def test_result_action_operation = {
+	.mnemonic = "TEST_RESULT_ACTION",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_RESULT_ACTION,
+	.dump = tst_test_result_action_operation_dump,
+	.execute = tst_test_result_action_operation_execute
+};
+
+/*
+ * Tagged arguments
+ */
+
+/* FIXME: merge this with the test_error version of this tag */
+
+static bool tst_test_result_action_validate_index_tag
+	(struct sieve_validator *validator, struct sieve_ast_argument **arg,
+		struct sieve_command *cmd);
+
+static const struct sieve_argument_def test_result_action_index_tag = {
+	.identifier = "index",
+	.validate = tst_test_result_action_validate_index_tag
+};
+
+enum tst_test_result_action_optional {
+	OPT_INDEX = SIEVE_MATCH_OPT_LAST,
+};
+
+/*
+ * Argument implementation
+ */
+
+static bool tst_test_result_action_validate_index_tag
+(struct sieve_validator *validator, struct sieve_ast_argument **arg,
+	struct sieve_command *cmd)
+{
+	struct sieve_ast_argument *tag = *arg;
+
+	/* Detach the tag itself */
+	*arg = sieve_ast_arguments_detach(*arg,1);
+
+	/* Check syntax:
+	 *   :index number
+	 */
+	if ( !sieve_validate_tag_parameter
+		(validator, cmd, tag, *arg, NULL, 0, SAAT_NUMBER, FALSE) ) {
+		return FALSE;
+	}
+
+	/* Skip parameter */
+	*arg = sieve_ast_argument_next(*arg);
+	return TRUE;
+}
+
+
+/*
+ * Command registration
+ */
+
+static bool tst_test_result_action_registered
+(struct sieve_validator *validator, const struct sieve_extension *ext,
+	struct sieve_command_registration *cmd_reg)
+{
+	/* The order of these is not significant */
+	sieve_comparators_link_tag(validator, cmd_reg, SIEVE_MATCH_OPT_COMPARATOR);
+	sieve_match_types_link_tags(validator, cmd_reg, SIEVE_MATCH_OPT_MATCH_TYPE);
+
+	sieve_validator_register_tag
+		(validator, cmd_reg, ext, &test_result_action_index_tag, OPT_INDEX);
+
+	return TRUE;
+}
+
+/*
+ * Validation
+ */
+
+static bool tst_test_result_action_validate
+(struct sieve_validator *valdtr ATTR_UNUSED, struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+	struct sieve_comparator cmp_default =
+		SIEVE_COMPARATOR_DEFAULT(i_octet_comparator);
+	struct sieve_match_type mcht_default =
+		SIEVE_COMPARATOR_DEFAULT(is_match_type);
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "key list", 2, SAAT_STRING_LIST) ) {
+		return FALSE;
+	}
+
+	if ( !sieve_validator_argument_activate(valdtr, tst, arg, FALSE) )
+		return FALSE;
+
+	/* Validate the key argument to a specified match type */
+	return sieve_match_type_validate
+		(valdtr, tst, arg, &mcht_default, &cmp_default);
+}
+
+/*
+ * Code generation
+ */
+
+static bool tst_test_result_action_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *tst)
+{
+	sieve_operation_emit(cgenv->sblock, tst->ext, &test_result_action_operation);
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, tst, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool tst_test_result_action_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	int opt_code = 0;
+
+	sieve_code_dumpf(denv, "TEST_RESULT_ACTION:");
+	sieve_code_descend(denv);
+
+	/* Handle any optional arguments */
+	for (;;) {
+		int opt;
+
+		if ( (opt=sieve_match_opr_optional_dump(denv, address, &opt_code))
+			< 0 )
+			return FALSE;
+
+		if ( opt == 0 ) break;
+
+		if ( opt_code == OPT_INDEX ) {
+			if ( !sieve_opr_number_dump(denv, address, "index") )
+				return FALSE;
+		} else {
+			return FALSE;
+		}
+	}
+
+	return sieve_opr_stringlist_dump(denv, address, "key list");
+}
+
+/*
+ * Intepretation
+ */
+
+static int tst_test_result_action_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	int opt_code = 0;
+	struct sieve_comparator cmp = SIEVE_COMPARATOR_DEFAULT(i_octet_comparator);
+	struct sieve_match_type mcht = SIEVE_MATCH_TYPE_DEFAULT(is_match_type);
+	struct sieve_stringlist *value_list, *key_list;
+	int index = 0;
+	int match, ret;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Read optional operands */
+	for (;;) {
+		sieve_number_t number;
+		int opt;
+
+		if ( (opt=sieve_match_opr_optional_read
+			(renv, address, &opt_code, &ret, &cmp, &mcht)) < 0 )
+			return ret;
+
+		if ( opt == 0 ) break;
+
+		if ( opt_code == OPT_INDEX ) {
+			if ( (ret=sieve_opr_number_read(renv, address, "index", &number)) <= 0 )
+				return ret;
+			index = (int) number;
+		} else {
+			sieve_runtime_trace_error(renv, "invalid optional operand");
+			return SIEVE_EXEC_BIN_CORRUPT;
+		}
+	}
+
+	/* Read key-list */
+	if ( (ret=sieve_opr_stringlist_read(renv, address, "key-list", &key_list))
+		<= 0 )
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+		"testsuite: test_result_action test; match result name (index: %d)", index);
+
+	/* Create value stringlist */
+	value_list = testsuite_result_stringlist_create(renv, index);
+
+	/* Perform match */
+	if ( (match=sieve_match(renv, &mcht, &cmp, value_list, key_list, &ret)) < 0 )
+		return ret;
+
+	/* Set test result for subsequent conditional jump */
+	sieve_interpreter_set_test_result(renv->interp, match > 0);
+	return SIEVE_EXEC_OK;
+}
+
+
+
diff --git a/pigeonhole/src/testsuite/tst-test-result-execute.c b/pigeonhole/src/testsuite/tst-test-result-execute.c
new file mode 100644
index 0000000..1b9a7ee
--- /dev/null
+++ b/pigeonhole/src/testsuite/tst-test-result-execute.c
@@ -0,0 +1,96 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-script.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+#include "sieve-dump.h"
+#include "sieve.h"
+
+#include "testsuite-common.h"
+#include "testsuite-result.h"
+
+/*
+ * Test_result_execute command
+ *
+ * Syntax:
+ *   test_result_execute
+ */
+
+static bool tst_test_result_execute_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd);
+
+const struct sieve_command_def tst_test_result_execute = {
+	.identifier = "test_result_execute",
+	.type = SCT_TEST,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.generate = tst_test_result_execute_generate
+};
+
+/*
+ * Operation
+ */
+
+static int tst_test_result_execute_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def test_result_execute_operation = {
+	.mnemonic = "TEST_RESULT_EXECUTE",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_RESULT_EXECUTE,
+	.execute = tst_test_result_execute_operation_execute
+};
+
+/*
+ * Code generation
+ */
+
+static bool tst_test_result_execute_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *tst)
+{
+	sieve_operation_emit(cgenv->sblock, tst->ext, &test_result_execute_operation);
+
+	return TRUE;
+}
+
+/*
+ * Intepretation
+ */
+
+static int tst_test_result_execute_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address ATTR_UNUSED)
+{
+	bool result = TRUE;
+
+	/*
+	 * Perform operation
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+		"testsuite: test_result_execute test");
+
+	result = testsuite_result_execute(renv);
+
+	if ( sieve_runtime_trace_active(renv, SIEVE_TRLVL_TESTS) ) {
+		sieve_runtime_trace_descend(renv);
+		sieve_runtime_trace(renv, 0, "execution of result %s",
+			( result ? "succeeded" : "failed" ));
+	}
+
+	/* Set result */
+	sieve_interpreter_set_test_result(renv->interp, result);
+
+	return SIEVE_EXEC_OK;
+}
+
+
+
+
diff --git a/pigeonhole/src/testsuite/tst-test-script-compile.c b/pigeonhole/src/testsuite/tst-test-script-compile.c
new file mode 100644
index 0000000..c053486
--- /dev/null
+++ b/pigeonhole/src/testsuite/tst-test-script-compile.c
@@ -0,0 +1,144 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-script.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+#include "sieve-dump.h"
+#include "sieve.h"
+
+#include "testsuite-common.h"
+#include "testsuite-script.h"
+
+/*
+ * Test_script_compile command
+ *
+ * Syntax:
+ *   test_script_compile <scriptpath: string>
+ */
+
+static bool tst_test_script_compile_validate
+	(struct sieve_validator *valdtr, struct sieve_command *cmd);
+static bool tst_test_script_compile_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd);
+
+const struct sieve_command_def tst_test_script_compile = {
+	.identifier = "test_script_compile",
+	.type = SCT_TEST,
+	.positional_args = 1,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.validate = tst_test_script_compile_validate,
+	.generate = tst_test_script_compile_generate
+};
+
+/*
+ * Operation
+ */
+
+static bool tst_test_script_compile_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int tst_test_script_compile_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def test_script_compile_operation = {
+	.mnemonic = "TEST_SCRIPT_COMPILE",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_SCRIPT_COMPILE,
+	.dump = tst_test_script_compile_operation_dump,
+	.execute = tst_test_script_compile_operation_execute
+};
+
+/*
+ * Validation
+ */
+
+static bool tst_test_script_compile_validate
+(struct sieve_validator *valdtr ATTR_UNUSED, struct sieve_command *tst)
+{
+	struct sieve_ast_argument *arg = tst->first_positional;
+
+	if ( !sieve_validate_positional_argument
+		(valdtr, tst, arg, "script", 1, SAAT_STRING) ) {
+		return FALSE;
+	}
+
+	return sieve_validator_argument_activate(valdtr, tst, arg, FALSE);
+}
+
+/*
+ * Code generation
+ */
+
+static bool tst_test_script_compile_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *tst)
+{
+	sieve_operation_emit(cgenv->sblock, tst->ext, &test_script_compile_operation);
+
+	/* Generate arguments */
+	return sieve_generate_arguments(cgenv, tst, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool tst_test_script_compile_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	sieve_code_dumpf(denv, "TEST_SCRIPT_COMPILE:");
+	sieve_code_descend(denv);
+
+	if ( !sieve_opr_string_dump(denv, address, "script-name") )
+		return FALSE;
+
+	return TRUE;
+}
+
+/*
+ * Intepretation
+ */
+
+static int tst_test_script_compile_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	string_t *script_name;
+	bool result = TRUE;
+	int ret;
+
+	/*
+	 * Read operands
+	 */
+
+	if ( (ret=sieve_opr_string_read(renv, address, "script-name", &script_name))
+		<= 0 )
+		return ret;
+
+	/*
+	 * Perform operation
+	 */
+
+	if ( sieve_runtime_trace_active(renv, SIEVE_TRLVL_TESTS) ) {
+		sieve_runtime_trace(renv, 0, "testsuite: test_script_compile test");
+		sieve_runtime_trace_descend(renv);
+	}
+
+	/* Attempt script compile */
+
+	result = testsuite_script_compile(renv, str_c(script_name));
+
+	/* Set result */
+	sieve_interpreter_set_test_result(renv->interp, result);
+
+	return SIEVE_EXEC_OK;
+}
+
+
+
+
diff --git a/pigeonhole/src/testsuite/tst-test-script-run.c b/pigeonhole/src/testsuite/tst-test-script-run.c
new file mode 100644
index 0000000..214a5c6
--- /dev/null
+++ b/pigeonhole/src/testsuite/tst-test-script-run.c
@@ -0,0 +1,198 @@
+/* Copyright (c) 2002-2018 Pigeonhole authors, see the included COPYING file
+ */
+
+#include "sieve-common.h"
+#include "sieve-script.h"
+#include "sieve-commands.h"
+#include "sieve-validator.h"
+#include "sieve-generator.h"
+#include "sieve-interpreter.h"
+#include "sieve-code.h"
+#include "sieve-binary.h"
+#include "sieve-dump.h"
+#include "sieve.h"
+
+#include "testsuite-common.h"
+#include "testsuite-script.h"
+#include "testsuite-result.h"
+
+/*
+ * Test_script_run command
+ *
+ * Syntax:
+ *   test_script_run
+ */
+
+static bool tst_test_script_run_registered
+(struct sieve_validator *validator, const struct sieve_extension *ext,
+	struct sieve_command_registration *cmd_reg);
+static bool tst_test_script_run_generate
+	(const struct sieve_codegen_env *cgenv, struct sieve_command *cmd);
+
+const struct sieve_command_def tst_test_script_run = {
+	.identifier = "test_script_run",
+	.type = SCT_TEST,
+	.positional_args = 0,
+	.subtests = 0,
+	.block_allowed = FALSE,
+	.block_required = FALSE,
+	.registered = tst_test_script_run_registered,
+	.generate = tst_test_script_run_generate
+};
+
+/*
+ * Operation
+ */
+
+static bool tst_test_script_run_operation_dump
+	(const struct sieve_dumptime_env *denv, sieve_size_t *address);
+static int tst_test_script_run_operation_execute
+	(const struct sieve_runtime_env *renv, sieve_size_t *address);
+
+const struct sieve_operation_def test_script_run_operation = {
+	.mnemonic = "TEST_SCRIPT_RUN",
+	.ext_def = &testsuite_extension,
+	.code = TESTSUITE_OPERATION_TEST_SCRIPT_RUN,
+	.dump = tst_test_script_run_operation_dump,
+	.execute = tst_test_script_run_operation_execute
+};
+
+/*
+ * Tagged arguments
+ */
+
+/* Codes for optional arguments */
+
+enum cmd_vacation_optional {
+	OPT_END,
+	OPT_APPEND_RESULT
+};
+
+/* Tags */
+
+static const struct sieve_argument_def append_result_tag = {
+	.identifier = "append_result"
+};
+
+static bool tst_test_script_run_registered
+(struct sieve_validator *validator, const struct sieve_extension *ext,
+	struct sieve_command_registration *cmd_reg)
+{
+	sieve_validator_register_tag
+		(validator, cmd_reg, ext, &append_result_tag, OPT_APPEND_RESULT);
+
+	return TRUE;
+}
+
+
+/*
+ * Code generation
+ */
+
+static bool tst_test_script_run_generate
+(const struct sieve_codegen_env *cgenv, struct sieve_command *tst)
+{
+	sieve_operation_emit(cgenv->sblock, tst->ext, &test_script_run_operation);
+
+	return sieve_generate_arguments(cgenv, tst, NULL);
+}
+
+/*
+ * Code dump
+ */
+
+static bool tst_test_script_run_operation_dump
+(const struct sieve_dumptime_env *denv, sieve_size_t *address)
+{
+	int opt_code = 0;
+
+	sieve_code_dumpf(denv, "TEST_SCRIPT_RUN");
+	sieve_code_descend(denv);
+
+	/* Dump optional operands */
+	for (;;) {
+		int opt;
+
+		if ( (opt=sieve_opr_optional_dump(denv, address, &opt_code)) < 0 )
+			return FALSE;
+
+		if ( opt == 0 ) break;
+
+		switch ( opt_code ) {
+		case OPT_APPEND_RESULT:
+			sieve_code_dumpf(denv, "append_result");
+			break;
+		default:
+			return FALSE;
+		}
+	}
+
+	return TRUE;
+}
+
+
+/*
+ * Intepretation
+ */
+
+static int tst_test_script_run_operation_execute
+(const struct sieve_runtime_env *renv, sieve_size_t *address)
+{
+	bool append_result = FALSE;
+	int opt_code = 0;
+	bool result = TRUE;
+
+	/*
+	 * Read operands
+	 */
+
+	/* Optional operands */
+	for (;;) {
+		int opt;
+
+		if ( (opt=sieve_opr_optional_read(renv, address, &opt_code)) < 0 )
+			return SIEVE_EXEC_BIN_CORRUPT;
+
+		if ( opt == 0 ) break;
+
+		switch ( opt_code ) {
+		case OPT_APPEND_RESULT:
+			append_result = TRUE;
+			break;
+		default:
+			sieve_runtime_trace_error(renv,
+				"unknown optional operand");
+			return SIEVE_EXEC_BIN_CORRUPT;
+		}
+	}
+
+	/*
+	 * Perform operation
+	 */
+
+	sieve_runtime_trace(renv, SIEVE_TRLVL_TESTS,
+		"testsuite: run compiled script [append_result=%s]",
+		( append_result ? "yes" : "no" ));
+
+	/* Reset result object */
+	if ( !append_result )
+		testsuite_result_reset(renv);
+
+	/* Run script */
+	result = testsuite_script_run(renv);
+
+	if ( sieve_runtime_trace_active(renv, SIEVE_TRLVL_TESTS) ) {
+		sieve_runtime_trace_descend(renv);
+		sieve_runtime_trace(renv, 0, "execution of script %s",
+			( result ? "succeeded" : "failed" ));
+	}
+
+	/* Indicate test status */
+	sieve_interpreter_set_test_result(renv->interp, result);
+
+	return SIEVE_EXEC_OK;
+}
+
+
+
+