Adding upstream version 1:2.3.21+dfsg1.upstream/1%2.3.21+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

204 files changed, 52770 insertions, 0 deletions

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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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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+	  *config.status*) \
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+	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_body.la: $(libsieve_ext_body_la_OBJECTS) $(libsieve_ext_body_la_DEPENDENCIES) $(EXTRA_libsieve_ext_body_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(LINK)  $(libsieve_ext_body_la_OBJECTS) $(libsieve_ext_body_la_LIBADD) $(LIBS)
+
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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 @@
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+
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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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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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+
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+	sieve-ext-copy.h
+
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+
+pkginc_libdir=$(dovecot_pkgincludedir)/sieve
+pkginc_lib_HEADERS = $(public_headers)
+noinst_HEADERS = $(headers)
+
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
+++ b/pigeonhole/src/lib-sieve/plugins/copy/Makefile.in
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+	sieve-ext-copy.h
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+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
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+	$(AM_V_CCLD)$(LINK)  $(libsieve_ext_copy_la_OBJECTS) $(libsieve_ext_copy_la_LIBADD) $(LIBS)
+
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+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-copy.Plo@am__quote@ # am--include-marker
+
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+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
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+	esac; \
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+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
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+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
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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/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 @@
+noinst_LTLIBRARIES = libsieve_ext_date.la
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new file mode 100644
index 0000000..0bc3ec0
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/date/Makefile.in
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+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
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+	if test -z "$(ETAGS_ARGS)$$*$$unique"; then :; else \
+	  test -n "$$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)
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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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+
+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	mostlyclean-am
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+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/ext-date-common.Plo
+	-rm -f ./$(DEPDIR)/ext-date.Plo
+	-rm -f ./$(DEPDIR)/tst-date.Plo
+	-rm -f Makefile
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+		-rm -f ./$(DEPDIR)/ext-date-common.Plo
+	-rm -f ./$(DEPDIR)/ext-date.Plo
+	-rm -f ./$(DEPDIR)/tst-date.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/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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+
+AM_CPPFLAGS = \
+	-I$(srcdir)/../.. \
+	$(LIBDOVECOT_INCLUDE)
+
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+	tst-duplicate.c
+
+extensions = \
+	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
@@ -0,0 +1,697 @@
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+
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+
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+	$(tests) \
+	$(extensions) \
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+
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+	    *$$dep*) \
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+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/lib-sieve/plugins/duplicate/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/lib-sieve/plugins/duplicate/Makefile
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+	  *config.status*) \
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+	-test -z "$(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_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:
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+
+distclean-compile:
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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+	fi
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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/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 = \
+	$(commands) \
+	ext-editheader.c \
+	ext-editheader-common.c
+
+noinst_HEADERS = \
+	ext-editheader-limits.h \
+	ext-editheader-common.h
diff --git a/pigeonhole/src/lib-sieve/plugins/editheader/Makefile.in b/pigeonhole/src/lib-sieve/plugins/editheader/Makefile.in
new file mode 100644
index 0000000..75d9571
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/editheader/Makefile.in
@@ -0,0 +1,701 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(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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+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)/cmd-addheader.Plo
+	-rm -f ./$(DEPDIR)/cmd-deleteheader.Plo
+	-rm -f ./$(DEPDIR)/ext-editheader-common.Plo
+	-rm -f ./$(DEPDIR)/ext-editheader.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/cmd-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
+
+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/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
+
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+	-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
+
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+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
+++ b/pigeonhole/src/lib-sieve/plugins/enotify/Makefile.in
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+	cmd-notify.c
+
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+	tst-valid-notify-method.c \
+	tst-notify-method-capability.c
+
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+	vmodf-encodeurl.c
+
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+	./mailto/libsieve_ext_enotify_mailto.la
+
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+	$(notify_methods)
+
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+	$(notify_methods)
+
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+	ext-enotify.c \
+	ext-enotify-common.c \
+	$(commands) \
+	$(tests) \
+	$(var_modifiers)
+
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+	sieve-ext-enotify.h
+
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+
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+	$(AM_V_CCLD)$(LINK)  $(libsieve_ext_enotify_la_OBJECTS) $(libsieve_ext_enotify_la_LIBADD) $(LIBS)
+
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+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
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+			   sort -u` ;; \
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+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
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+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
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+	    || exit 1; \
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+	-rm -f ./$(DEPDIR)/tst-notify-method-capability.Plo
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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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+	uri-mailto.c \
+	ntfy-mailto.c
+
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+	uri-mailto.h
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+
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+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
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+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+libsieve_ext_enotify_mailto.la: $(libsieve_ext_enotify_mailto_la_OBJECTS) $(libsieve_ext_enotify_mailto_la_DEPENDENCIES) $(EXTRA_libsieve_ext_enotify_mailto_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(LINK)  $(libsieve_ext_enotify_mailto_la_OBJECTS) $(libsieve_ext_enotify_mailto_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
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+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ntfy-mailto.Plo@am__quote@ # am--include-marker
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+	      "$$@" $$unique; \
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+	      $$unique; \
+	  fi; \
+	fi
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+GTAGS:
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+	esac; \
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+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
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+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
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+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    fi; \
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+	    fi; \
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+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
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+	      install; \
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+	  $(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)/ntfy-mailto.Plo
+	-rm -f ./$(DEPDIR)/uri-mailto.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
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+		-rm -f ./$(DEPDIR)/ntfy-mailto.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/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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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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+	  rm -f $${locs}; \
+	}
+
+libsieve_ext_environment.la: $(libsieve_ext_environment_la_OBJECTS) $(libsieve_ext_environment_la_DEPENDENCIES) $(EXTRA_libsieve_ext_environment_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(LINK)  $(libsieve_ext_environment_la_OBJECTS) $(libsieve_ext_environment_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-environment-common.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-environment.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/tst-environment.Plo@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
+am--depfiles: $(am__depfiles_remade)
+
+.c.o:
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+	done
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+	  fi; \
+	fi
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+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
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+	      -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 $$file; then d=.; else d=$(srcdir); fi; \
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+	    if test -d "$(distdir)/$$file"; then \
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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
+check-am: all-am
+check: check-am
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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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+	  $(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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+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 \
+	mostlyclean-am
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+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/ext-environment-common.Plo
+	-rm -f ./$(DEPDIR)/ext-environment.Plo
+	-rm -f ./$(DEPDIR)/tst-environment.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
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+dvi: dvi-am
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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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+	cscopelist-am ctags ctags-am distclean distclean-compile \
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+	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 \
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+	mostlyclean-libtool pdf pdf-am ps ps-am tags tags-am uninstall \
+	uninstall-am uninstall-pkginc_libHEADERS
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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 @@
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+
+AM_CPPFLAGS = \
+	-I$(srcdir)/../.. \
+	$(LIBDOVECOT_INCLUDE)
+
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+	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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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 @@
+noinst_LTLIBRARIES = libsieve_ext_imap4flags.la
+
+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
+++ b/pigeonhole/src/lib-sieve/plugins/imap4flags/Makefile.in
@@ -0,0 +1,776 @@
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+# @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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+
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+
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+	ext-imap4flags-common.c \
+	$(commands) \
+	$(tests) \
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+	ext-imap4flags.c \
+	ext-imapflags.c
+
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+	sieve-ext-imap4flags.h
+
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+	ext-imap4flags-common.h
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+	      exit 1;; \
+	  esac; \
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+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/lib-sieve/plugins/imap4flags/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/lib-sieve/plugins/imap4flags/Makefile
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+	  *config.status*) \
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+	  echo rm -f $${locs}; \
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+	fi
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+	     $$unique
+
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+	here=`$(am__cd) $(top_builddir) && pwd` \
+	  && $(am__cd) $(top_srcdir) \
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+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
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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/$$file; then \
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+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
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+	      find "$(distdir)/$$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" \
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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+	  $(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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+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)/ext-imap4flags-common.Plo
+	-rm -f ./$(DEPDIR)/ext-imap4flags.Plo
+	-rm -f ./$(DEPDIR)/ext-imapflags.Plo
+	-rm -f ./$(DEPDIR)/tag-flags.Plo
+	-rm -f ./$(DEPDIR)/tst-hasflag.Plo
+	-rm -f Makefile
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+	-rm -f ./$(DEPDIR)/ext-imapflags.Plo
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+	-rm -f ./$(DEPDIR)/tst-hasflag.Plo
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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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+
+
+# 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/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
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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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+GTAGS:
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+	esac; \
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+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
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+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
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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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+	    || cp -p $$d/$$file "$(distdir)/$$file" \
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+	done
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+installcheck: installcheck-am
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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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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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+	fi
+mostlyclean-generic:
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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)/ext-include-common.Plo
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+	-rm -f ./$(DEPDIR)/ext-include.Plo
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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 \
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+  else \
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+  fi; \
+}
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+  if $(am__is_gnu_make); then \
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+  strip_trailopt () \
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+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
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+      *=*|--*) continue;; \
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+      -*I?*) strip_trailopt 'I';; \
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+      -*l?*) strip_trailopt 'l';; \
+      -[dEDm]) skip_next=yes;; \
+      -[JT]) skip_next=yes;; \
+    esac; \
+    case $$flg in \
+      *$$target_option*) has_opt=yes; break;; \
+    esac; \
+  done; \
+  test $$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@
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+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
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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)
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+	$(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 =
+LTLIBRARIES = $(noinst_LTLIBRARIES)
+libsieve_ext_index_la_LIBADD =
+am_libsieve_ext_index_la_OBJECTS = ext-index-common.lo ext-index.lo \
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+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(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 = $(headers)
diff --git a/pigeonhole/src/lib-sieve/plugins/mailbox/Makefile.in b/pigeonhole/src/lib-sieve/plugins/mailbox/Makefile.in
new file mode 100644
index 0000000..6d5ed09
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/mailbox/Makefile.in
@@ -0,0 +1,757 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
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+  elif test -n '$(MAKE_HOST)'; then \
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+}
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+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
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+  }; \
+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
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+      *=*|--*) 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 $$has_opt = yes
+am__make_dryrun = (target_option=n; $(am__make_running_with_option))
+am__make_keepgoing = (target_option=k; $(am__make_running_with_option))
+pkgdatadir = $(datadir)/@PACKAGE@
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+am__cd = CDPATH="$${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 = :
+POST_UNINSTALL = :
+build_triplet = @build@
+host_triplet = @host@
+subdir = src/lib-sieve/plugins/mailbox
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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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+am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
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+mkinstalldirs = $(install_sh) -d
+CONFIG_HEADER = $(top_builddir)/dummy-config.h \
+	$(top_builddir)/pigeonhole-config.h
+CONFIG_CLEAN_FILES =
+CONFIG_CLEAN_VPATH_FILES =
+LTLIBRARIES = $(noinst_LTLIBRARIES)
+libsieve_ext_mailbox_la_LIBADD =
+am__objects_1 = tag-mailbox-create.lo
+am__objects_2 = tst-mailboxexists.lo
+am_libsieve_ext_mailbox_la_OBJECTS = $(am__objects_1) $(am__objects_2) \
+	ext-mailbox.lo
+libsieve_ext_mailbox_la_OBJECTS =  \
+	$(am_libsieve_ext_mailbox_la_OBJECTS)
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+	  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) $(HEADERS)
+installdirs:
+	for dir in "$(DESTDIR)$(pkginc_libdir)"; 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 $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/ext-mailbox.Plo
+	-rm -f ./$(DEPDIR)/tag-mailbox-create.Plo
+	-rm -f ./$(DEPDIR)/tst-mailboxexists.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-pkginc_libHEADERS
+
+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 ./$(DEPDIR)/ext-mailbox.Plo
+	-rm -f ./$(DEPDIR)/tag-mailbox-create.Plo
+	-rm -f ./$(DEPDIR)/tst-mailboxexists.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-pkginc_libHEADERS
+
+.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-pkginc_libHEADERS 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-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/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)/../variables \
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+
+tests = \
+	tst-metadata.c \
+	tst-metadataexists.c
+
+extensions = \
+	ext-metadata.c
+
+libsieve_ext_metadata_la_SOURCES = \
+	$(tests) \
+	$(extensions)
+
+noinst_HEADERS = \
+	ext-metadata-common.h
+
diff --git a/pigeonhole/src/lib-sieve/plugins/metadata/Makefile.in b/pigeonhole/src/lib-sieve/plugins/metadata/Makefile.in
new file mode 100644
index 0000000..0b95819
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/metadata/Makefile.in
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+	@list='$(noinst_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
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+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
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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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+
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+commands = \
+	cmd-foreverypart.c \
+	cmd-break.c \
+	cmd-extracttext.c
+
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+	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
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+	cmd-break.c \
+	cmd-extracttext.c
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+
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+	ext-mime.c \
+	ext-foreverypart.c \
+	ext-extracttext.c
+
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+	ext-mime-common.c \
+	$(commands) \
+	$(tags) \
+	$(extensions)
+
+noinst_HEADERS = \
+	ext-mime-common.h
+
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+	      exit 1;; \
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+	$(am__cd) $(top_srcdir) && \
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+@AMDEP_TRUE@@am__include@ @am__quote@./$(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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+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
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+	      -e "s|^$$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 $$file; then d=.; else d=$(srcdir); fi; \
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+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
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+	    fi; \
+	    cp -fpR $$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)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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+	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 $(CONFIG_CLEAN_VPATH_FILES)
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+	-rm -f ./$(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
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+
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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 \
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+  else \
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+  if $(am__is_gnu_make); then \
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+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
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+      *=*|--*) continue;; \
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+      -*I?*) strip_trailopt 'I';; \
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+      -[JT]) skip_next=yes;; \
+    esac; \
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+      *$$target_option*) has_opt=yes; break;; \
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+  test $$has_opt = yes
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+INSTALL_HEADER = $(INSTALL_DATA)
+transform = $(program_transform_name)
+NORMAL_INSTALL = :
+PRE_INSTALL = :
+POST_INSTALL = :
+NORMAL_UNINSTALL = :
+PRE_UNINSTALL = :
+POST_UNINSTALL = :
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+host_triplet = @host@
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+am__aclocal_m4_deps = $(top_srcdir)/m4/dovecot.m4 \
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+am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
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+	$(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 =
+LTLIBRARIES = $(noinst_LTLIBRARIES)
+libsieve_ext_notify_la_LIBADD =
+am__objects_1 = cmd-notify.lo cmd-denotify.lo
+am_libsieve_ext_notify_la_OBJECTS = ext-notify.lo ext-notify-common.lo \
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+am__maybe_remake_depfiles = depfiles
+am__depfiles_remade = ./$(DEPDIR)/cmd-denotify.Plo \
+	./$(DEPDIR)/cmd-notify.Plo ./$(DEPDIR)/ext-notify-common.Plo \
+	./$(DEPDIR)/ext-notify.Plo
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+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(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)/../.. \
+	$(LIBDOVECOT_INCLUDE)
+
+libsieve_ext_regex_la_SOURCES = \
+	mcht-regex.c \
+	ext-regex-common.c \
+	ext-regex.c
+
+noinst_HEADERS = \
+	ext-regex-common.h
diff --git a/pigeonhole/src/lib-sieve/plugins/regex/Makefile.in b/pigeonhole/src/lib-sieve/plugins/regex/Makefile.in
new file mode 100644
index 0000000..379d384
--- /dev/null
+++ b/pigeonhole/src/lib-sieve/plugins/regex/Makefile.in
@@ -0,0 +1,688 @@
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+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
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+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
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+
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+
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+		-rm -f ./$(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 $$MAKEFLAGS in \
+      *\\[\ \	]*) \
+        bs=\\; \
+        sane_makeflags=`printf '%s\n' "$$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/relational
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+	      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 ./$(DEPDIR)/mcht-value.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/ext-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
+
+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/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
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index 0000000..dca31e3
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+	      "$$@" $$unique; \
+	  else \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
+	      $$unique; \
+	  fi; \
+	fi
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+
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+GTAGS:
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+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
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+	esac; \
+	for i in $$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)
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+	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)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
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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:
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+	-rm -f ./$(DEPDIR)/tst-spamvirustest.Plo
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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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+	$(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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+	$(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;; \
+	  *) \
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+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
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+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
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+
+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 $${locs}; \
+	}
+
+libsieve_ext_special_use.la: $(libsieve_ext_special_use_la_OBJECTS) $(libsieve_ext_special_use_la_DEPENDENCIES) $(EXTRA_libsieve_ext_special_use_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(LINK)  $(libsieve_ext_special_use_la_OBJECTS) $(libsieve_ext_special_use_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-special-use-common.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/ext-special-use.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/tag-specialuse.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/tst-specialuse-exists.Plo@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
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+
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+	-rm -f *.lo
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+	-rm -rf .libs _libs
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+ID: $(am__tagged_files)
+	$(am__define_uniq_tagged_files); mkid -fID $$unique
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+	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) "$$here"
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+
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+	list='$(am__tagged_files)'; \
+	case "$(srcdir)" in \
+	  [\\/]* | ?:[\\/]*) sdir="$(srcdir)" ;; \
+	  *) sdir=$(subdir)/$(srcdir) ;; \
+	esac; \
+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
+
+distclean-tags:
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+distdir: $(BUILT_SOURCES)
+	$(MAKE) $(AM_MAKEFLAGS) distdir-am
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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|^$$srcdirstrip/||;t" \
+	      -e "s|^$$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
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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 $(CONFIG_CLEAN_VPATH_FILES)
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+	mostlyclean-am
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+		-rm -f ./$(DEPDIR)/ext-special-use-common.Plo
+	-rm -f ./$(DEPDIR)/ext-special-use.Plo
+	-rm -f ./$(DEPDIR)/tag-specialuse.Plo
+	-rm -f ./$(DEPDIR)/tst-specialuse-exists.Plo
+	-rm -f Makefile
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+		-rm -f ./$(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
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+	clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	cscopelist-am ctags ctags-am distclean distclean-compile \
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+	install-exec install-exec-am install-html install-html-am \
+	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/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
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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
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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/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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+	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) \
+	$(tsts) \
+	ext-variables.c
+
+public_headers = \
+	sieve-ext-variables.h
+
+headers = \
+	ext-variables-common.h \
+	ext-variables-limits.h \
+	ext-variables-name.h \
+	ext-variables-namespaces.h \
+	ext-variables-arguments.h \
+	ext-variables-operands.h \
+	ext-variables-modifiers.h \
+	ext-variables-dump.h
+
+pkginc_libdir=$(dovecot_pkgincludedir)/sieve
+pkginc_lib_HEADERS = $(public_headers)
+noinst_HEADERS = $(headers)
+
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
@@ -0,0 +1,801 @@
+# 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,
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+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
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+	-rm -f ./$(DEPDIR)/ext-variables-namespaces.Plo
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+	-rm -f ./$(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
+++ b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/debug/Makefile.am
@@ -0,0 +1,15 @@
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+
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+
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+	$(commands) \
+	ext-debug.c
+
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+	ext-debug-common.h
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
+++ b/pigeonhole/src/lib-sieve/plugins/vnd.dovecot/debug/Makefile.in
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+	    $(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)
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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:
+
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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
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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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+	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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+  elif test -n '$(MAKE_VERSION)' && test -n '$(CURDIR)'; then \
+    true; \
+  else \
+    false; \
+  fi; \
+}
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+  if $(am__is_gnu_make); then \
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+  strip_trailopt () \
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+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
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+      *=*|--*) continue;; \
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+      -*I?*) strip_trailopt 'I';; \
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+      -*O?*) strip_trailopt 'O';; \
+        -*l) strip_trailopt 'l'; skip_next=yes;; \
+      -*l?*) strip_trailopt 'l';; \
+      -[dEDm]) skip_next=yes;; \
+      -[JT]) skip_next=yes;; \
+    esac; \
+    case $$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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+am__cd = CDPATH="$${ZSH_VERSION+.}$(PATH_SEPARATOR)" && cd
+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 = :
+PRE_UNINSTALL = :
+POST_UNINSTALL = :
+build_triplet = @build@
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+subdir = src/lib-sieve/plugins/vnd.dovecot/report
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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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+am__configure_deps = $(am__aclocal_m4_deps) $(CONFIGURE_DEPENDENCIES) \
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+	$(am__DIST_COMMON)
+mkinstalldirs = $(install_sh) -d
+CONFIG_HEADER = $(top_builddir)/dummy-config.h \
+	$(top_builddir)/pigeonhole-config.h
+CONFIG_CLEAN_FILES =
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+	if test -z '$(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 $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(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;
+}