Adding upstream version 1:2.3.19.1+dfsg1.upstream/1%2.3.19.1+dfsg1upstream

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

8 files changed, 2236 insertions, 0 deletions

diff --git a/src/lib-lda/Makefile.am b/src/lib-lda/Makefile.am
new file mode 100644
index 0000000..3ea04f3
--- /dev/null
+++ b/src/lib-lda/Makefile.am
@@ -0,0 +1,35 @@
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+	-I$(top_srcdir)/src/lib-imap \
+	-I$(top_srcdir)/src/lib-smtp \
+	-I$(top_srcdir)/src/lib-mail \
+	-I$(top_srcdir)/src/lib-storage \
+	-I$(top_srcdir)/src/lib-ssl-iostream
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diff --git a/src/lib-lda/Makefile.in b/src/lib-lda/Makefile.in
new file mode 100644
index 0000000..9d2713a
--- /dev/null
+++ b/src/lib-lda/Makefile.in
@@ -0,0 +1,878 @@
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+	-I$(top_srcdir)/src/lib-imap \
+	-I$(top_srcdir)/src/lib-smtp \
+	-I$(top_srcdir)/src/lib-mail \
+	-I$(top_srcdir)/src/lib-storage \
+	-I$(top_srcdir)/src/lib-ssl-iostream
+
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+	mail-deliver.c \
+	mail-send.c
+
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+	mail-deliver.h \
+	mail-send.h
+
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+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
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+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
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+	fi
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+	clean-generic clean-libtool clean-noinstLTLIBRARIES \
+	clean-pkglibLTLIBRARIES cscopelist-am ctags ctags-am distclean \
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+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib-lda/lda-settings.c b/src/lib-lda/lda-settings.c
new file mode 100644
index 0000000..1bb02f8
--- /dev/null
+++ b/src/lib-lda/lda-settings.c
@@ -0,0 +1,80 @@
+/* Copyright (c) 2005-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "hostpid.h"
+#include "settings-parser.h"
+#include "mail-storage-settings.h"
+#include "smtp-submit-settings.h"
+#include "lda-settings.h"
+
+#include <stddef.h>
+
+static bool lda_settings_check(void *_set, pool_t pool, const char **error_r);
+
+#undef DEF
+#undef DEFLIST
+#define DEF(type, name) \
+	SETTING_DEFINE_STRUCT_##type(#name, name, struct lda_settings)
+#define DEFLIST(field, name, defines) \
+	{ .type = SET_DEFLIST, .key = name, \
+	  .offset = offsetof(struct lda_settings, field), \
+	  .list_info = defines }
+
+static const struct setting_define lda_setting_defines[] = {
+	DEF(STR, hostname),
+	DEF(STR, rejection_subject),
+	DEF(STR, rejection_reason),
+	DEF(STR, deliver_log_format),
+	DEF(STR, recipient_delimiter),
+	DEF(STR, lda_original_recipient_header),
+	DEF(BOOL, quota_full_tempfail),
+	DEF(BOOL, lda_mailbox_autocreate),
+	DEF(BOOL, lda_mailbox_autosubscribe),
+
+	SETTING_DEFINE_LIST_END
+};
+
+static const struct lda_settings lda_default_settings = {
+	.hostname = "",
+	.rejection_subject = "Rejected: %s",
+	.rejection_reason =
+		"Your message to <%t> was automatically rejected:%n%r",
+	.deliver_log_format = "msgid=%m: %$",
+	.recipient_delimiter = "+",
+	.lda_original_recipient_header = "",
+	.quota_full_tempfail = FALSE,
+	.lda_mailbox_autocreate = FALSE,
+	.lda_mailbox_autosubscribe = FALSE
+};
+
+static const struct setting_parser_info *lda_setting_dependencies[] = {
+	&mail_user_setting_parser_info,
+	&smtp_submit_setting_parser_info,
+	NULL
+};
+
+const struct setting_parser_info lda_setting_parser_info = {
+	.module_name = "lda",
+	.defines = lda_setting_defines,
+	.defaults = &lda_default_settings,
+
+	.type_offset = SIZE_MAX,
+	.struct_size = sizeof(struct lda_settings),
+
+	.parent_offset = SIZE_MAX,
+
+#ifndef CONFIG_BINARY
+	.check_func = lda_settings_check,
+#endif
+	.dependencies = lda_setting_dependencies
+};
+
+static bool lda_settings_check(void *_set, pool_t pool,
+	const char **error_r ATTR_UNUSED)
+{
+	struct lda_settings *set = _set;
+
+	if (*set->hostname == '\0')
+		set->hostname = p_strdup(pool, my_hostdomain());
+	return TRUE;
+}
diff --git a/src/lib-lda/lda-settings.h b/src/lib-lda/lda-settings.h
new file mode 100644
index 0000000..8b0c209
--- /dev/null
+++ b/src/lib-lda/lda-settings.h
@@ -0,0 +1,21 @@
+#ifndef LDA_SETTINGS_H
+#define LDA_SETTINGS_H
+
+struct mail_user_settings;
+
+struct lda_settings {
+	const char *hostname;
+	const char *rejection_subject;
+	const char *rejection_reason;
+	const char *deliver_log_format;
+	const char *recipient_delimiter;
+	const char *lda_original_recipient_header;
+
+	bool quota_full_tempfail;
+	bool lda_mailbox_autocreate;
+	bool lda_mailbox_autosubscribe;
+};
+
+extern const struct setting_parser_info lda_setting_parser_info;
+
+#endif
diff --git a/src/lib-lda/mail-deliver.c b/src/lib-lda/mail-deliver.c
new file mode 100644
index 0000000..e0f69da
--- /dev/null
+++ b/src/lib-lda/mail-deliver.c
@@ -0,0 +1,810 @@
+/* Copyright (c) 2005-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "array.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "time-util.h"
+#include "unichar.h"
+#include "var-expand.h"
+#include "message-address.h"
+#include "smtp-address.h"
+#include "lda-settings.h"
+#include "mail-storage.h"
+#include "mail-namespace.h"
+#include "mail-storage-private.h"
+#include "mail-duplicate.h"
+#include "mail-deliver.h"
+
+#define DUPLICATE_DB_NAME "lda-dupes"
+
+#define MAIL_DELIVER_USER_CONTEXT(obj) \
+	MODULE_CONTEXT_REQUIRE(obj, mail_deliver_user_module)
+#define MAIL_DELIVER_STORAGE_CONTEXT(obj) \
+	MODULE_CONTEXT_REQUIRE(obj, mail_deliver_storage_module)
+
+struct event_category event_category_mail_delivery = {
+	.name = "local-delivery",
+};
+
+struct mail_deliver_user {
+	union mail_user_module_context module_ctx;
+	struct mail_deliver_context *deliver_ctx;
+	bool want_storage_id;
+};
+
+deliver_mail_func_t *deliver_mail = NULL;
+
+struct mail_deliver_mailbox {
+	union mailbox_module_context module_ctx;
+};
+
+struct mail_deliver_transaction {
+	union mailbox_transaction_module_context module_ctx;
+
+	struct mail_deliver_fields deliver_fields;
+};
+
+static const char *lda_log_wanted_headers[] = {
+	"From", "Message-ID", "Subject",
+	NULL
+};
+static enum mail_fetch_field lda_log_wanted_fetch_fields =
+	MAIL_FETCH_PHYSICAL_SIZE | MAIL_FETCH_VIRTUAL_SIZE;
+static MODULE_CONTEXT_DEFINE_INIT(mail_deliver_user_module,
+				  &mail_user_module_register);
+static MODULE_CONTEXT_DEFINE_INIT(mail_deliver_storage_module,
+				  &mail_storage_module_register);
+
+static struct message_address *
+mail_deliver_get_message_address(struct mail *mail, const char *header)
+{
+	struct message_address *addr;
+	const char *str;
+
+	if (mail_get_first_header(mail, header, &str) <= 0)
+		return NULL;
+	addr = message_address_parse(pool_datastack_create(),
+				     (const unsigned char *)str,
+				     strlen(str), 1, 0);
+	if (addr == NULL || addr->mailbox == NULL || addr->domain == NULL ||
+	    *addr->mailbox == '\0' || *addr->domain == '\0')
+		return NULL;
+	return addr;
+}
+
+const struct smtp_address *
+mail_deliver_get_address(struct mail *mail, const char *header)
+{
+	struct message_address *addr;
+	struct smtp_address *smtp_addr;
+
+	addr = mail_deliver_get_message_address(mail, header);
+	if (addr == NULL ||
+	    smtp_address_create_from_msg_temp(addr, &smtp_addr) < 0)
+		return NULL;
+	return smtp_addr;
+}
+
+static void
+mail_deliver_update_event(struct mail_deliver_context *ctx)
+{
+	event_add_str(ctx->event, "message_id", ctx->fields.message_id);
+	event_add_str(ctx->event, "message_subject", ctx->fields.subject);
+	event_add_str(ctx->event, "message_from", ctx->fields.from);
+	if (ctx->fields.psize != UOFF_T_MAX)
+		event_add_int(ctx->event, "message_size", ctx->fields.psize);
+	if (ctx->fields.vsize != UOFF_T_MAX)
+		event_add_int(ctx->event, "message_vsize", ctx->fields.vsize);
+}
+
+static void
+update_str_field(pool_t pool, const char **old_str, const char *new_str)
+{
+	if (new_str == NULL || new_str[0] == '\0')
+		*old_str = NULL;
+	else if (*old_str == NULL || strcmp(*old_str, new_str) != 0)
+		*old_str = p_strdup(pool, new_str);
+}
+
+static void
+mail_deliver_fields_update(struct mail_deliver_fields *fields, pool_t pool,
+			   struct mail *mail)
+{
+	const char *message_id = NULL, *subject = NULL, *from_envelope = NULL;
+	static struct message_address *from_addr;
+	const char *from;
+
+	if (fields->filled)
+		return;
+	fields->filled = TRUE;
+
+	if (mail_get_message_id(mail, &message_id) > 0)
+		message_id = str_sanitize(message_id, 200);
+	update_str_field(pool, &fields->message_id, message_id);
+
+	if (mail_get_first_header_utf8(mail, "Subject", &subject) > 0)
+		subject = str_sanitize(subject, 80);
+	update_str_field(pool, &fields->subject, subject);
+
+	from_addr = mail_deliver_get_message_address(mail, "From");
+	from = (from_addr == NULL ? NULL :
+		t_strconcat(from_addr->mailbox, "@", from_addr->domain, NULL));
+	update_str_field(pool, &fields->from, from);
+
+	if (mail_get_special(mail, MAIL_FETCH_FROM_ENVELOPE, &from_envelope) > 0)
+		from_envelope = str_sanitize(from_envelope, 80);
+	update_str_field(pool, &fields->from_envelope, from_envelope);
+
+	if (mail_get_physical_size(mail, &fields->psize) < 0)
+		fields->psize = 0;
+	if (mail_get_virtual_size(mail, &fields->vsize) < 0)
+		fields->vsize = 0;
+}
+
+const struct var_expand_table *
+mail_deliver_ctx_get_log_var_expand_table(struct mail_deliver_context *ctx,
+					  const char *message)
+{
+	unsigned int delivery_time_msecs;
+
+	/* If a mail was saved/copied, the fields are already filled and the
+	   following call is ignored. Otherwise, only the source mail exists. */
+	mail_deliver_fields_update(&ctx->fields, ctx->pool, ctx->src_mail);
+	/* This call finishes a mail delivery. With Sieve there may be multiple
+	   mail deliveries. */
+	ctx->fields.filled = FALSE;
+
+	mail_deliver_update_event(ctx);
+
+	io_loop_time_refresh();
+	delivery_time_msecs = timeval_diff_msecs(&ioloop_timeval,
+						 &ctx->delivery_time_started);
+
+	const struct var_expand_table stack_tab[] = {
+		{ '$', message, NULL },
+		{ 'm', ctx->fields.message_id != NULL ?
+		       ctx->fields.message_id : "unspecified", "msgid" },
+		{ 's', ctx->fields.subject, "subject" },
+		{ 'f', ctx->fields.from, "from" },
+		{ 'e', ctx->fields.from_envelope, "from_envelope" },
+		{ 'p', dec2str(ctx->fields.psize), "size" },
+		{ 'w', dec2str(ctx->fields.vsize), "vsize" },
+		{ '\0', dec2str(delivery_time_msecs), "delivery_time" },
+		{ '\0', dec2str(ctx->session_time_msecs), "session_time" },
+		{ '\0', smtp_address_encode(ctx->rcpt_params.orcpt.addr), "to_envelope" },
+		{ '\0', ctx->fields.storage_id, "storage_id" },
+		{ '\0', NULL, NULL }
+	};
+	return p_memdup(unsafe_data_stack_pool, stack_tab, sizeof(stack_tab));
+}
+
+void mail_deliver_log(struct mail_deliver_context *ctx, const char *fmt, ...)
+{
+	va_list args;
+	string_t *str;
+	const struct var_expand_table *tab;
+	const char *msg, *error;
+
+	if (*ctx->set->deliver_log_format == '\0')
+		return;
+
+	va_start(args, fmt);
+	msg = t_strdup_vprintf(fmt, args);
+
+	str = t_str_new(256);
+	tab = mail_deliver_ctx_get_log_var_expand_table(ctx, msg);
+	if (var_expand(str, ctx->set->deliver_log_format, tab, &error) <= 0) {
+		e_error(ctx->event,
+			"Failed to expand deliver_log_format=%s: %s",
+			ctx->set->deliver_log_format, error);
+	}
+
+	e_info(ctx->event, "%s", str_c(str));
+	va_end(args);
+}
+
+struct mail_deliver_session *mail_deliver_session_init(void)
+{
+	struct mail_deliver_session *session;
+	pool_t pool;
+
+	pool = pool_alloconly_create("mail deliver session", 1024);
+	session = p_new(pool, struct mail_deliver_session, 1);
+	session->pool = pool;
+	return session;
+}
+
+void mail_deliver_session_deinit(struct mail_deliver_session **_session)
+{
+	struct mail_deliver_session *session = *_session;
+
+	*_session = NULL;
+	pool_unref(&session->pool);
+}
+
+int mail_deliver_save_open(struct mail_deliver_save_open_context *ctx,
+			   const char *name, struct mailbox **box_r,
+			   enum mail_error *error_r, const char **error_str_r)
+{
+	struct mailbox *box;
+	enum mailbox_flags flags = MAILBOX_FLAG_POST_SESSION;
+
+	*box_r = NULL;
+	*error_r = MAIL_ERROR_NONE;
+	*error_str_r = NULL;
+
+	if (!uni_utf8_str_is_valid(name)) {
+		*error_str_r = "Mailbox name not valid UTF-8";
+		*error_r = MAIL_ERROR_PARAMS;
+		return -1;
+	}
+
+	if (ctx->lda_mailbox_autocreate)
+		flags |= MAILBOX_FLAG_AUTO_CREATE;
+	if (ctx->lda_mailbox_autosubscribe)
+		flags |= MAILBOX_FLAG_AUTO_SUBSCRIBE;
+	*box_r = box = mailbox_alloc_for_user(ctx->user, name, flags);
+
+	if (mailbox_open(box) == 0)
+		return 0;
+	*error_str_r = mailbox_get_last_internal_error(box, error_r);
+	return -1;
+}
+
+static bool mail_deliver_check_duplicate(struct mail_deliver_session *session,
+					 struct mailbox *box)
+{
+	struct mailbox_metadata metadata;
+	const guid_128_t *guid;
+
+	if (mailbox_get_metadata(box, MAILBOX_METADATA_GUID, &metadata) < 0) {
+		/* just play it safe and assume a duplicate */
+		return TRUE;
+	}
+
+	/* there shouldn't be all that many recipients,
+	   so just do a linear search */
+	if (!array_is_created(&session->inbox_guids))
+		p_array_init(&session->inbox_guids, session->pool, 8);
+	array_foreach(&session->inbox_guids, guid) {
+		if (memcmp(metadata.guid, *guid, sizeof(metadata.guid)) == 0)
+			return TRUE;
+	}
+	array_push_back(&session->inbox_guids, &metadata.guid);
+	return FALSE;
+}
+
+void mail_deliver_deduplicate_guid_if_needed(struct mail_deliver_session *session,
+					     struct mail_save_context *save_ctx)
+{
+	struct mailbox_transaction_context *trans =
+		mailbox_save_get_transaction(save_ctx);
+	struct mailbox *box = mailbox_transaction_get_mailbox(trans);
+	guid_128_t guid;
+
+	if (strcmp(mailbox_get_name(box), "INBOX") != 0)
+		return;
+
+	/* avoid storing duplicate GUIDs to delivered mails to INBOX. this
+	   happens if mail is delivered to same user multiple times within a
+	   session. the problem with this is that if GUIDs are used as POP3
+	   UIDLs, some clients can't handle the duplicates well. */
+	if (mail_deliver_check_duplicate(session, box)) {
+		guid_128_generate(guid);
+		mailbox_save_set_guid(save_ctx, guid_128_to_string(guid));
+	}
+}
+
+void mail_deliver_init(struct mail_deliver_context *ctx,
+		       struct mail_deliver_input *input)
+{
+	i_zero(ctx);
+	ctx->set = input->set;
+	ctx->smtp_set = input->smtp_set;
+
+	ctx->session = input->session;
+	ctx->pool = input->session->pool;
+	pool_ref(ctx->pool);
+
+	ctx->session_time_msecs = input->session_time_msecs;
+	ctx->delivery_time_started = input->delivery_time_started;
+	ctx->session_id = p_strdup(ctx->pool, input->session_id);
+	ctx->src_mail = input->src_mail;
+	ctx->save_dest_mail = input->save_dest_mail;
+
+	ctx->mail_from = smtp_address_clone(ctx->pool, input->mail_from);
+	smtp_params_mail_copy(ctx->pool, &ctx->mail_params,
+			      &input->mail_params);
+	ctx->rcpt_to = smtp_address_clone(ctx->pool, input->rcpt_to);
+	smtp_params_rcpt_copy(ctx->pool, &ctx->rcpt_params,
+			      &input->rcpt_params);
+	ctx->rcpt_user = input->rcpt_user;
+	ctx->rcpt_default_mailbox = p_strdup(ctx->pool,
+					     input->rcpt_default_mailbox);
+
+	ctx->event = event_create(input->event_parent);
+	event_add_category(ctx->event, &event_category_mail_delivery);
+
+	mail_deliver_fields_update(&ctx->fields, ctx->pool, ctx->src_mail);
+	mail_deliver_update_event(ctx);
+
+	if (ctx->rcpt_to != NULL) {
+		event_add_str(ctx->event, "rcpt_to",
+			      smtp_address_encode(ctx->rcpt_to));
+	}
+	smtp_params_rcpt_add_to_event(&ctx->rcpt_params, ctx->event);
+}
+
+void mail_deliver_deinit(struct mail_deliver_context *ctx)
+{
+	event_unref(&ctx->event);
+	pool_unref(&ctx->pool);
+}
+
+static struct mail *
+mail_deliver_open_mail(struct mailbox *box, uint32_t uid,
+		       enum mail_fetch_field wanted_fields,
+		       struct mailbox_transaction_context **trans_r)
+{
+	struct mailbox_transaction_context *t;
+	struct mail *mail;
+
+	*trans_r = NULL;
+
+	if (mailbox_sync(box, MAILBOX_SYNC_FLAG_FAST) < 0)
+		return NULL;
+
+	t = mailbox_transaction_begin(box, 0, __func__);
+	mail = mail_alloc(t, wanted_fields, NULL);
+
+	if (!mail_set_uid(mail, uid)) {
+		mail_free(&mail);
+		mailbox_transaction_rollback(&t);
+	}
+	*trans_r = t;
+	return mail;
+}
+
+int mail_deliver_save(struct mail_deliver_context *ctx, const char *mailbox,
+		      enum mail_flags flags, const char *const *keywords,
+		      struct mail_storage **storage_r)
+{
+	struct mail_deliver_save_open_context open_ctx;
+	struct mailbox *box;
+	enum mailbox_transaction_flags trans_flags;
+	struct mailbox_transaction_context *t;
+	struct mail_save_context *save_ctx;
+	struct mailbox_header_lookup_ctx *headers_ctx;
+	struct mail_keywords *kw;
+	struct mail *dest_mail;
+	enum mail_error error;
+	const char *mailbox_name, *errstr, *guid;
+	struct mail_transaction_commit_changes changes;
+	bool default_save;
+	int ret = 0;
+
+	i_assert(ctx->dest_mail == NULL);
+
+	default_save = strcmp(mailbox, ctx->rcpt_default_mailbox) == 0;
+	if (default_save)
+		ctx->tried_default_save = TRUE;
+
+	i_zero(&open_ctx);
+	open_ctx.user = ctx->rcpt_user;
+	open_ctx.lda_mailbox_autocreate = ctx->set->lda_mailbox_autocreate;
+	open_ctx.lda_mailbox_autosubscribe = ctx->set->lda_mailbox_autosubscribe;
+
+	mailbox_name = str_sanitize(mailbox, 80);
+	if (mail_deliver_save_open(&open_ctx, mailbox, &box,
+				   &error, &errstr) < 0) {
+		if (box != NULL) {
+			*storage_r = mailbox_get_storage(box);
+			mailbox_free(&box);
+		}
+		mail_deliver_log(ctx, "save failed to open mailbox %s: %s",
+				 mailbox_name, errstr);
+		return -1;
+	}
+	*storage_r = mailbox_get_storage(box);
+
+	trans_flags = MAILBOX_TRANSACTION_FLAG_EXTERNAL;
+	if (ctx->save_dest_mail)
+		trans_flags |= MAILBOX_TRANSACTION_FLAG_ASSIGN_UIDS;
+	t = mailbox_transaction_begin(box, trans_flags, __func__);
+
+	kw = str_array_length(keywords) == 0 ? NULL :
+		mailbox_keywords_create_valid(box, keywords);
+	save_ctx = mailbox_save_alloc(t);
+	if (ctx->mail_from != NULL) {
+		mailbox_save_set_from_envelope(save_ctx,
+			smtp_address_encode(ctx->mail_from));
+	}
+	mailbox_save_set_flags(save_ctx, flags, kw);
+
+	headers_ctx = mailbox_header_lookup_init(box, lda_log_wanted_headers);
+	dest_mail = mailbox_save_get_dest_mail(save_ctx);
+	mail_add_temp_wanted_fields(dest_mail, lda_log_wanted_fetch_fields, NULL);
+	mailbox_header_lookup_unref(&headers_ctx);
+	mail_deliver_deduplicate_guid_if_needed(ctx->session, save_ctx);
+
+	if (mailbox_save_using_mail(&save_ctx, ctx->src_mail) < 0)
+		ret = -1;
+	if (kw != NULL)
+		mailbox_keywords_unref(&kw);
+
+	if (ret < 0)
+		mailbox_transaction_rollback(&t);
+	else
+		ret = mailbox_transaction_commit_get_changes(&t, &changes);
+
+	if (ret == 0) {
+		ctx->saved_mail = TRUE;
+		if (ctx->save_dest_mail) {
+			/* copying needs the message body. with maildir we also
+			   need to get the GUID in case the message gets
+			   expunged. get these early so the copying won't fail
+			   later on. */
+			i_assert(array_count(&changes.saved_uids) == 1);
+			const struct seq_range *range =
+				array_front(&changes.saved_uids);
+			i_assert(range->seq1 == range->seq2);
+			ctx->dest_mail = mail_deliver_open_mail(box, range->seq1,
+				MAIL_FETCH_STREAM_BODY | MAIL_FETCH_GUID, &t);
+			if (ctx->dest_mail == NULL) {
+				i_assert(t == NULL);
+			} else if (mail_get_special(ctx->dest_mail, MAIL_FETCH_GUID, &guid) < 0) {
+				mail_free(&ctx->dest_mail);
+				mailbox_transaction_rollback(&t);
+			}
+		}
+		mail_deliver_log(ctx, "saved mail to %s", mailbox_name);
+		pool_unref(&changes.pool);
+	} else {
+		mail_deliver_log(ctx, "save failed to %s: %s", mailbox_name,
+			mail_storage_get_last_internal_error(*storage_r, &error));
+	}
+
+	if (ctx->dest_mail == NULL)
+		mailbox_free(&box);
+	return ret;
+}
+
+const struct smtp_address *
+mail_deliver_get_return_address(struct mail_deliver_context *ctx)
+{
+	struct message_address *addr;
+	struct smtp_address *smtp_addr;
+	const char *path;
+	int ret;
+
+	if (!smtp_address_isnull(ctx->mail_from))
+		return ctx->mail_from;
+
+	if ((ret=mail_get_first_header(ctx->src_mail,
+				       "Return-Path", &path)) <= 0) {
+		if (ret < 0) {
+			struct mailbox *box = ctx->src_mail->box;
+			e_warning(ctx->event,
+				  "Failed read return-path header: %s",
+				  mailbox_get_last_internal_error(box, NULL));
+		}
+		return NULL;
+	}
+	if (message_address_parse_path(pool_datastack_create(),
+				       (const unsigned char *)path,
+				       strlen(path), &addr) < 0 ||
+	    smtp_address_create_from_msg(ctx->pool, addr, &smtp_addr) < 0) {
+		e_warning(ctx->event, "Failed to parse return-path header");
+		return NULL;
+	}
+	return smtp_addr;
+}
+
+const char *mail_deliver_get_new_message_id(struct mail_deliver_context *ctx)
+{
+	static int count = 0;
+	struct mail_user *user = ctx->rcpt_user;
+	const struct mail_storage_settings *mail_set =
+		mail_user_set_get_storage_set(user);
+
+	return t_strdup_printf("<dovecot-%s-%s-%d@%s>",
+			       dec2str(ioloop_timeval.tv_sec),
+			       dec2str(ioloop_timeval.tv_usec),
+			       count++, mail_set->hostname);
+}
+
+static bool mail_deliver_is_tempfailed(struct mail_deliver_context *ctx,
+				       struct mail_storage *storage)
+{
+	enum mail_error error;
+
+	if (ctx->tempfail_error != NULL)
+		return TRUE;
+	if (storage != NULL) {
+		(void)mail_storage_get_last_error(storage, &error);
+		return error == MAIL_ERROR_TEMP;
+	}
+	return FALSE;
+}
+
+static int
+mail_do_deliver(struct mail_deliver_context *ctx,
+		struct mail_storage **storage_r)
+{
+	int ret;
+
+	*storage_r = NULL;
+	if (deliver_mail == NULL)
+		ret = -1;
+	else {
+		ctx->dup_db = mail_duplicate_db_init(ctx->rcpt_user,
+						     DUPLICATE_DB_NAME);
+		if (deliver_mail(ctx, storage_r) <= 0) {
+			/* if message was saved, don't bounce it even though
+			   the script failed later. */
+			ret = ctx->saved_mail ? 0 : -1;
+		} else {
+			/* success. message may or may not have been saved. */
+			ret = 0;
+		}
+		mail_duplicate_db_deinit(&ctx->dup_db);
+		if (ret < 0 && mail_deliver_is_tempfailed(ctx, *storage_r))
+			return -1;
+	}
+
+	if (ret < 0 && !ctx->tried_default_save) {
+		/* plugins didn't handle this. save into the default mailbox. */
+		ret = mail_deliver_save(ctx, ctx->rcpt_default_mailbox, 0, NULL,
+					storage_r);
+		if (ret < 0 && mail_deliver_is_tempfailed(ctx, *storage_r))
+			return -1;
+	}
+	if (ret < 0 && strcasecmp(ctx->rcpt_default_mailbox, "INBOX") != 0) {
+		/* still didn't work. try once more to save it
+		   to INBOX. */
+		ret = mail_deliver_save(ctx, "INBOX", 0, NULL, storage_r);
+	}
+	return ret;
+}
+
+int mail_deliver(struct mail_deliver_context *ctx,
+		 enum mail_deliver_error *error_code_r,
+		 const char **error_r)
+{
+	struct mail_deliver_user *muser =
+		MAIL_DELIVER_USER_CONTEXT(ctx->rcpt_user);
+	struct event_passthrough *e;
+	struct mail_storage *storage = NULL;
+	enum mail_deliver_error error_code = MAIL_DELIVER_ERROR_NONE;
+	const char *error = NULL;
+	int ret;
+
+	i_assert(muser->deliver_ctx == NULL);
+
+	mail_deliver_fields_update(&ctx->fields, ctx->pool, ctx->src_mail);
+	mail_deliver_update_event(ctx);
+
+	muser->want_storage_id =
+		var_has_key(ctx->set->deliver_log_format, '\0', "storage_id");
+
+	muser->deliver_ctx = ctx;
+
+	e = event_create_passthrough(ctx->event)->
+		set_name("mail_delivery_started");
+	e_debug(e->event(), "Local delivery started");
+
+	ret = mail_do_deliver(ctx, &storage);
+
+	if (ret >= 0)
+		i_assert(ret == 0); /* ret > 0 has no defined meaning */
+	else if (ctx->tempfail_error != NULL) {
+		error = ctx->tempfail_error;
+		error_code = MAIL_DELIVER_ERROR_TEMPORARY;
+	} else if (storage != NULL) {
+		enum mail_error mail_error;
+
+		error = mail_storage_get_last_error(storage, &mail_error);
+		if (mail_error == MAIL_ERROR_NOQUOTA) {
+			error_code = MAIL_DELIVER_ERROR_NOQUOTA;
+		} else {
+			error_code = MAIL_DELIVER_ERROR_TEMPORARY;
+		}
+	} else {
+		/* This shouldn't happen */
+		e_error(ctx->event, "BUG: Saving failed to unknown storage");
+		error = "Temporary internal error";
+		error_code = MAIL_DELIVER_ERROR_INTERNAL;
+	}
+
+	e = event_create_passthrough(ctx->event)->
+		set_name("mail_delivery_finished");
+	if (ret == 0) {
+		e_debug(e->event(), "Local delivery finished successfully");
+	} else {
+		e->add_str("error", error);
+		e_debug(e->event(), "Local delivery failed: %s", error);
+	}
+
+	muser->deliver_ctx = NULL;
+
+	*error_code_r = error_code;
+	*error_r = error;
+	return ret;
+}
+
+deliver_mail_func_t *mail_deliver_hook_set(deliver_mail_func_t *new_hook)
+{
+	deliver_mail_func_t *old_hook = deliver_mail;
+
+	deliver_mail = new_hook;
+	return old_hook;
+}
+
+static int mail_deliver_save_finish(struct mail_save_context *ctx)
+{
+	struct mailbox *box = ctx->transaction->box;
+	struct mail_deliver_mailbox *mbox = MAIL_DELIVER_STORAGE_CONTEXT(box);
+	struct mail_deliver_user *muser =
+		MAIL_DELIVER_USER_CONTEXT(box->storage->user);
+	struct mail_deliver_transaction *dt =
+		MAIL_DELIVER_STORAGE_CONTEXT(ctx->transaction);
+
+	if (mbox->module_ctx.super.save_finish(ctx) < 0)
+		return -1;
+
+	/* initialize most of the fields from dest_mail */
+	mail_deliver_fields_update(&dt->deliver_fields,
+				   muser->deliver_ctx->pool,
+				   ctx->dest_mail);
+	return 0;
+}
+
+static int mail_deliver_copy(struct mail_save_context *ctx, struct mail *mail)
+{
+	struct mailbox *box = ctx->transaction->box;
+	struct mail_deliver_mailbox *mbox = MAIL_DELIVER_STORAGE_CONTEXT(box);
+	struct mail_deliver_user *muser =
+		MAIL_DELIVER_USER_CONTEXT(box->storage->user);
+	struct mail_deliver_transaction *dt =
+		MAIL_DELIVER_STORAGE_CONTEXT(ctx->transaction);
+
+	if (mbox->module_ctx.super.copy(ctx, mail) < 0)
+		return -1;
+
+	/* initialize most of the fields from dest_mail */
+	mail_deliver_fields_update(&dt->deliver_fields,
+				   muser->deliver_ctx->pool,
+				   ctx->dest_mail);
+	return 0;
+}
+
+static void
+mail_deliver_fields_update_post_commit(struct mailbox *orig_box, uint32_t uid)
+{
+	struct mail_deliver_user *muser =
+		MAIL_DELIVER_USER_CONTEXT(orig_box->storage->user);
+	struct mailbox *box;
+	struct mailbox_transaction_context *t;
+	struct mail *mail;
+	const char *storage_id;
+
+	if (!muser->want_storage_id)
+		return;
+
+	/* getting storage_id requires a whole new mailbox view that is
+	   synced, so it'll contain the newly written mail. this is racy, so
+	   it's possible another process has already deleted the mail. */
+	box = mailbox_alloc(orig_box->list, orig_box->vname, 0);
+	mail = mail_deliver_open_mail(box, uid, MAIL_FETCH_STORAGE_ID, &t);
+	if (mail != NULL) {
+		if (mail_get_special(mail, MAIL_FETCH_STORAGE_ID, &storage_id) < 0 ||
+		    storage_id[0] == '\0')
+			storage_id = NULL;
+		muser->deliver_ctx->fields.storage_id =
+			p_strdup(muser->deliver_ctx->pool, storage_id);
+		mail_free(&mail);
+		(void)mailbox_transaction_commit(&t);
+	} else {
+		muser->deliver_ctx->fields.storage_id = NULL;
+	}
+	mailbox_free(&box);
+}
+
+static struct mailbox_transaction_context *
+mail_deliver_transaction_begin(struct mailbox *box,
+			       enum mailbox_transaction_flags flags,
+			       const char *reason)
+{
+	struct mail_deliver_mailbox *mbox = MAIL_DELIVER_STORAGE_CONTEXT(box);
+	struct mail_deliver_user *muser =
+		MAIL_DELIVER_USER_CONTEXT(box->storage->user);
+	struct mailbox_transaction_context *t;
+	struct mail_deliver_transaction *dt;
+
+	i_assert(muser->deliver_ctx != NULL);
+
+	t = mbox->module_ctx.super.transaction_begin(box, flags, reason);
+	dt = p_new(muser->deliver_ctx->pool, struct mail_deliver_transaction, 1);
+
+	MODULE_CONTEXT_SET(t, mail_deliver_storage_module, dt);
+	return t;
+}
+
+static int
+mail_deliver_transaction_commit(struct mailbox_transaction_context *ctx,
+				struct mail_transaction_commit_changes *changes_r)
+{
+	struct mailbox *box = ctx->box;
+	struct mail_deliver_mailbox *mbox = MAIL_DELIVER_STORAGE_CONTEXT(box);
+	struct mail_deliver_transaction *dt = MAIL_DELIVER_STORAGE_CONTEXT(ctx);
+	struct mail_deliver_user *muser =
+		MAIL_DELIVER_USER_CONTEXT(box->storage->user);
+
+	i_assert(muser->deliver_ctx != NULL);
+
+	/* sieve creates multiple transactions, saves the mails and
+	   then commits all of them at the end. we'll need to keep
+	   switching the deliver_ctx->fields for each commit.
+
+	   we also want to do this only for commits generated by sieve.
+	   other plugins or storage backends may be creating transactions as
+	   well, which we need to ignore. */
+	if ((box->flags & MAILBOX_FLAG_POST_SESSION) != 0) {
+		muser->deliver_ctx->fields = dt->deliver_fields;
+		mail_deliver_update_event(muser->deliver_ctx);
+	}
+
+	if (mbox->module_ctx.super.transaction_commit(ctx, changes_r) < 0)
+		return -1;
+
+	if (array_count(&changes_r->saved_uids) > 0) {
+		const struct seq_range *range =
+			array_front(&changes_r->saved_uids);
+
+		mail_deliver_fields_update_post_commit(box, range->seq1);
+	}
+	return 0;
+}
+
+static void mail_deliver_mail_user_created(struct mail_user *user)
+{
+	struct mail_deliver_user *muser;
+
+	muser = p_new(user->pool, struct mail_deliver_user, 1);
+	MODULE_CONTEXT_SET(user, mail_deliver_user_module, muser);
+}
+
+static void mail_deliver_mailbox_allocated(struct mailbox *box)
+{
+	struct mailbox_vfuncs *v = box->vlast;
+	struct mail_deliver_mailbox *mbox;
+	struct mail_deliver_user *muser =
+		MAIL_DELIVER_USER_CONTEXT(box->storage->user);
+
+	/* we are doing something other than lda/lmtp delivery
+	   and should not be involved */
+	if (muser->deliver_ctx == NULL)
+		return;
+
+	mbox = p_new(box->pool, struct mail_deliver_mailbox, 1);
+	mbox->module_ctx.super = *v;
+	box->vlast = &mbox->module_ctx.super;
+	v->save_finish = mail_deliver_save_finish;
+	v->copy = mail_deliver_copy;
+	v->transaction_begin = mail_deliver_transaction_begin;
+	v->transaction_commit = mail_deliver_transaction_commit;
+
+	MODULE_CONTEXT_SET(box, mail_deliver_storage_module, mbox);
+ }
+
+static struct mail_storage_hooks mail_deliver_hooks = {
+	.mail_user_created = mail_deliver_mail_user_created,
+	.mailbox_allocated = mail_deliver_mailbox_allocated
+};
+
+void mail_deliver_hooks_init(void)
+{
+	mail_storage_hooks_add_internal(&mail_deliver_hooks);
+}
diff --git a/src/lib-lda/mail-deliver.h b/src/lib-lda/mail-deliver.h
new file mode 100644
index 0000000..5396a82
--- /dev/null
+++ b/src/lib-lda/mail-deliver.h
@@ -0,0 +1,185 @@
+#ifndef MAIL_DELIVER_H
+#define MAIL_DELIVER_H
+
+#include "guid.h"
+#include "mail-types.h"
+#include "mail-error.h"
+#include "smtp-params.h"
+
+#include <sys/time.h>
+
+struct smtp_address;
+struct mail_storage;
+struct mail_save_context;
+struct mailbox;
+
+enum mail_deliver_error {
+	MAIL_DELIVER_ERROR_NONE = 0,
+
+	/* Temporary error */
+	MAIL_DELIVER_ERROR_TEMPORARY,
+	/* Delivery rejected */
+	MAIL_DELIVER_ERROR_REJECTED,
+	/* Out of storage quota for mailbox or user */
+	MAIL_DELIVER_ERROR_NOQUOTA,
+	/* Internal error (BUG) */
+	MAIL_DELIVER_ERROR_INTERNAL,
+};
+
+struct mail_deliver_session {
+	pool_t pool;
+
+	/* List of INBOX GUIDs where this mail has already been saved to */
+	ARRAY(guid_128_t) inbox_guids;
+};
+
+struct mail_deliver_input {
+	const struct lda_settings *set;
+	const struct smtp_submit_settings *smtp_set;
+	struct mail_deliver_session *session;
+	struct event *event_parent;
+
+	unsigned int session_time_msecs;
+	struct timeval delivery_time_started;
+
+	/* Session ID, used as log line prefix if non-NULL. */
+	const char *session_id;
+	/* Mail to save */
+	struct mail *src_mail;
+
+	/* Envelope sender, if known. */
+	const struct smtp_address *mail_from;
+	/* MAIL parameters */
+	struct smtp_params_mail mail_params;
+
+	/* Envelope recipient (final recipient) */
+	const struct smtp_address *rcpt_to;
+	/* RCPT parameters (can contain original recipient) */
+	struct smtp_params_rcpt rcpt_params;
+	/* Destination user */
+	struct mail_user *rcpt_user;
+	/* Mailbox where mail should be saved, unless e.g. Sieve does
+	   something to it. */
+	const char *rcpt_default_mailbox;
+
+	bool save_dest_mail:1;
+};
+
+struct mail_deliver_fields {
+	const char *message_id;
+	const char *subject;
+	const char *from;
+	const char *from_envelope;
+	const char *storage_id;
+
+	uoff_t psize, vsize;
+
+	bool filled:1;
+};
+
+struct mail_deliver_context {
+	pool_t pool;
+	const struct lda_settings *set;
+	const struct smtp_submit_settings *smtp_set;
+	struct mail_deliver_session *session;
+	struct event *event;
+
+	unsigned int session_time_msecs;
+	struct timeval delivery_time_started;
+
+	struct mail_duplicate_db *dup_db;
+
+	/* Session ID, used as log line prefix if non-NULL. */
+	const char *session_id;
+	/* Mail to save */
+	struct mail *src_mail;
+
+	/* Envelope sender, if known. */
+	const struct smtp_address *mail_from;
+	/* MAIL parameters */
+	struct smtp_params_mail mail_params;
+
+	/* Envelope recipient (final recipient) */
+	const struct smtp_address *rcpt_to;
+	/* RCPT parameters (can contain original recipient) */
+	struct smtp_params_rcpt rcpt_params;
+	/* Destination user */
+	struct mail_user *rcpt_user;
+	/* Mailbox where mail should be saved, unless e.g. Sieve does
+	   something to it. */
+	const char *rcpt_default_mailbox;
+
+	/* Filled with destination mail, if save_dest_mail=TRUE.
+	   The caller must free the mail, its transaction and close
+	   the mailbox. */
+	struct mail *dest_mail;
+
+	/* Recorded field values for the transaction */
+	struct mail_deliver_fields fields;
+
+	/* Error message for a temporary failure. This is necessary only when
+	   there is no storage where to get the error message from. */
+	const char *tempfail_error;
+
+	bool tried_default_save;
+	bool saved_mail;
+	bool save_dest_mail;
+	/* Delivery failed because user is out of quota / disk space */
+	bool mailbox_full;
+	/* Send DSN instead of MDN */
+	bool dsn;
+};
+
+struct mail_deliver_save_open_context {
+	struct mail_user *user;
+	bool lda_mailbox_autocreate;
+	bool lda_mailbox_autosubscribe;
+};
+
+typedef int deliver_mail_func_t(struct mail_deliver_context *ctx,
+				struct mail_storage **storage_r);
+
+extern deliver_mail_func_t *deliver_mail;
+
+const struct var_expand_table *
+mail_deliver_ctx_get_log_var_expand_table(struct mail_deliver_context *ctx,
+					  const char *message);
+void mail_deliver_log(struct mail_deliver_context *ctx, const char *fmt, ...)
+	ATTR_FORMAT(2, 3);
+
+const struct smtp_address *
+mail_deliver_get_address(struct mail *mail, const char *header);
+const struct smtp_address *
+mail_deliver_get_return_address(struct mail_deliver_context *ctx);
+const char *mail_deliver_get_new_message_id(struct mail_deliver_context *ctx);
+
+struct mail_deliver_session *mail_deliver_session_init(void);
+void mail_deliver_session_deinit(struct mail_deliver_session **session);
+
+void mail_deliver_init(struct mail_deliver_context *ctx,
+		       struct mail_deliver_input *input);
+void mail_deliver_deinit(struct mail_deliver_context *ctx);
+
+/* Try to open mailbox for saving. Returns 0 if ok, -1 if error. The box may
+   be returned even with -1, and the caller must free it then. */
+int mail_deliver_save_open(struct mail_deliver_save_open_context *ctx,
+			   const char *name, struct mailbox **box_r,
+			   enum mail_error *error_r, const char **error_str_r);
+int mail_deliver_save(struct mail_deliver_context *ctx, const char *mailbox,
+		      enum mail_flags flags, const char *const *keywords,
+		      struct mail_storage **storage_r) ATTR_NULL(4);
+void mail_deliver_deduplicate_guid_if_needed(struct mail_deliver_session *session,
+					     struct mail_save_context *save_ctx);
+
+int mail_deliver(struct mail_deliver_context *ctx,
+		 enum mail_deliver_error *error_code_r,
+		 const char **error_r);
+
+/* Sets the deliver_mail hook and returns the previous hook,
+   which the new_hook should call if it's non-NULL. */
+deliver_mail_func_t *mail_deliver_hook_set(deliver_mail_func_t *new_hook);
+
+/* Must be called before any storage is created. */
+void mail_deliver_hooks_init(void);
+
+#endif
diff --git a/src/lib-lda/mail-send.c b/src/lib-lda/mail-send.c
new file mode 100644
index 0000000..2027b0b
--- /dev/null
+++ b/src/lib-lda/mail-send.c
@@ -0,0 +1,216 @@
+/* Copyright (c) 2005-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "ioloop.h"
+#include "hostpid.h"
+#include "istream.h"
+#include "ostream.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "var-expand.h"
+#include "message-date.h"
+#include "message-size.h"
+#include "message-address.h"
+#include "istream-header-filter.h"
+#include "mail-storage.h"
+#include "mail-storage-settings.h"
+#include "iostream-ssl.h"
+#include "lda-settings.h"
+#include "mail-deliver.h"
+#include "smtp-address.h"
+#include "smtp-submit.h"
+#include "mail-send.h"
+
+#include <sys/wait.h>
+
+static const struct var_expand_table *
+get_var_expand_table(struct mail *mail,
+		     const struct smtp_address *recipient,
+		     const char *reason)
+{
+	const char *subject;
+	if (mail_get_first_header(mail, "Subject", &subject) <= 0)
+		subject = "";
+
+	const struct var_expand_table stack_tab[] = {
+		{ 'n', "\r\n", "crlf" },
+		{ 'r', reason, "reason" },
+		{ 's', str_sanitize(subject, 80), "subject" },
+		{ 't', smtp_address_encode(recipient), "to" },
+		{ '\0', NULL, NULL }
+	};
+	struct var_expand_table *tab;
+
+	tab = t_malloc_no0(sizeof(stack_tab));
+	memcpy(tab, stack_tab, sizeof(stack_tab));
+	return tab;
+}
+
+int mail_send_rejection(struct mail_deliver_context *ctx,
+			const struct smtp_address *recipient,
+			const char *reason)
+{
+	struct mail_user *user = ctx->rcpt_user;
+	struct ssl_iostream_settings ssl_set;
+	struct mail *mail = ctx->src_mail;
+	struct istream *input;
+	struct smtp_submit_input smtp_input;
+	struct smtp_submit *smtp_submit;
+	struct ostream *output;
+	const struct message_address *postmaster_addr;
+	const struct smtp_address *return_addr;
+	const char *hdr, *value, *msgid, *orig_msgid, *boundary, *error;
+	const struct var_expand_table *vtable;
+	string_t *str;
+	int ret;
+
+	if (mail_get_first_header(mail, "Message-ID", &orig_msgid) < 0)
+		orig_msgid = NULL;
+
+	if (mail_get_first_header(mail, "Auto-Submitted", &value) > 0 &&
+		strcasecmp(value, "no") != 0) {
+		i_info("msgid=%s: Auto-submitted message discarded: %s",
+			orig_msgid == NULL ? "" : str_sanitize(orig_msgid, 80),
+			str_sanitize(reason, 512));
+		return 0;
+	}
+
+	return_addr = mail_deliver_get_return_address(ctx);
+	if (smtp_address_isnull(return_addr)) {
+		i_info("msgid=%s: Return-Path missing, rejection reason: %s",
+			orig_msgid == NULL ? "" : str_sanitize(orig_msgid, 80),
+			str_sanitize(reason, 512));
+		return 0;
+	}
+
+	if (!mail_user_get_postmaster_address(user, &postmaster_addr, &error)) {
+		i_error("msgid=%s: Invalid postmaster_address - can't send rejection: %s",
+			orig_msgid == NULL ? "" : str_sanitize(orig_msgid, 80), error);
+		return -1;
+	}
+
+	e_debug(mail_event(mail), "Sending a rejection to <%s>: %s",
+		smtp_address_encode(return_addr),
+		str_sanitize(reason, 512));
+
+	vtable = get_var_expand_table(mail, recipient, reason);
+
+	mail_user_init_ssl_client_settings(user, &ssl_set);
+
+	i_zero(&smtp_input);
+	smtp_input.ssl = &ssl_set;
+	smtp_submit = smtp_submit_init_simple(&smtp_input, ctx->smtp_set, NULL);
+	smtp_submit_add_rcpt(smtp_submit, return_addr);
+	output = smtp_submit_send(smtp_submit);
+
+	msgid = mail_deliver_get_new_message_id(ctx);
+	boundary = t_strdup_printf("%s/%s", my_pid, user->set->hostname);
+
+	str = t_str_new(512);
+	str_printfa(str, "Message-ID: %s\r\n", msgid);
+	str_printfa(str, "Date: %s\r\n", message_date_create(ioloop_time));
+	str_append(str, "From: ");
+	message_address_write(str, postmaster_addr);
+	str_append(str, "\r\n");
+	str_printfa(str, "To: <%s>\r\n", smtp_address_encode(return_addr));
+	str_append(str, "MIME-Version: 1.0\r\n");
+	str_printfa(str, "Content-Type: "
+		"multipart/report; report-type=%s;\r\n"
+		"\tboundary=\"%s\"\r\n",
+		ctx->dsn ? "delivery-status" : "disposition-notification",
+		boundary);
+	str_append(str, "Subject: ");
+	if (var_expand(str, ctx->set->rejection_subject,
+		vtable, &error) <= 0) {
+		i_error("Failed to expand rejection_subject=%s: %s",
+			ctx->set->rejection_subject, error);
+	}
+	str_append(str, "\r\n");
+
+	str_append(str, "Auto-Submitted: auto-replied (rejected)\r\n");
+	str_append(str, "Precedence: bulk\r\n");
+	str_append(str, "\r\nThis is a MIME-encapsulated message\r\n\r\n");
+
+	/* human readable status report */
+	str_printfa(str, "--%s\r\n", boundary);
+	str_append(str, "Content-Type: text/plain; charset=utf-8\r\n");
+	str_append(str, "Content-Disposition: inline\r\n");
+	str_append(str, "Content-Transfer-Encoding: 8bit\r\n\r\n");
+
+	if (var_expand(str, ctx->set->rejection_reason,
+		vtable, &error) <= 0) {
+		i_error("Failed to expand rejection_reason=%s: %s",
+			ctx->set->rejection_reason, error);
+	}
+	str_append(str, "\r\n");
+
+	if (ctx->dsn) {
+		/* DSN status report: For LDA rejects. currently only used when
+		   user is out of quota */
+		str_printfa(str, "--%s\r\n"
+			"Content-Type: message/delivery-status\r\n\r\n",
+			boundary);
+		str_printfa(str, "Reporting-MTA: dns; %s\r\n", user->set->hostname);
+		if (mail_get_first_header(mail, "Original-Recipient", &hdr) > 0)
+			str_printfa(str, "Original-Recipient: rfc822; %s\r\n", hdr);
+		str_printfa(str, "Final-Recipient: rfc822; %s\r\n",
+			smtp_address_encode(recipient));
+		str_append(str, "Action: failed\r\n");
+		str_printfa(str, "Status: %s\r\n", ctx->mailbox_full ? "5.2.2" : "5.2.0");
+	} else {
+		/* MDN status report: For Sieve "reject" */
+		str_printfa(str, "--%s\r\n"
+			"Content-Type: message/disposition-notification\r\n\r\n",
+			boundary);
+		str_printfa(str, "Reporting-UA: %s; Dovecot Mail Delivery Agent\r\n",
+			user->set->hostname);
+		if (mail_get_first_header(mail, "Original-Recipient", &hdr) > 0)
+			str_printfa(str, "Original-Recipient: rfc822; %s\r\n", hdr);
+		str_printfa(str, "Final-Recipient: rfc822; %s\r\n",
+			smtp_address_encode(recipient));
+
+		if (orig_msgid != NULL)
+			str_printfa(str, "Original-Message-ID: %s\r\n", orig_msgid);
+		str_append(str, "Disposition: "
+			"automatic-action/MDN-sent-automatically; deleted\r\n");
+	}
+	str_append(str, "\r\n");
+
+	/* original message's headers */
+	str_printfa(str, "--%s\r\nContent-Type: message/rfc822\r\n\r\n", boundary);
+	o_stream_nsend(output, str_data(str), str_len(str));
+
+	if (mail_get_hdr_stream(mail, NULL, &input) == 0) {
+		/* Note: If you add more headers, they need to be sorted.
+		   We'll drop Content-Type because we're not including the message
+		   body, and having a multipart Content-Type may confuse some
+		   MIME parsers when they don't see the message boundaries. */
+		static const char *const exclude_headers[] = {
+			"Content-Type"
+		};
+
+		input = i_stream_create_header_filter(input,
+			HEADER_FILTER_EXCLUDE | HEADER_FILTER_NO_CR |
+			HEADER_FILTER_HIDE_BODY, exclude_headers,
+			N_ELEMENTS(exclude_headers),
+			*null_header_filter_callback, NULL);
+
+		o_stream_nsend_istream(output, input);
+		i_stream_unref(&input);
+	}
+
+	str_truncate(str, 0);
+	str_printfa(str, "\r\n\r\n--%s--\r\n", boundary);
+	o_stream_nsend(output, str_data(str), str_len(str));
+	if ((ret = smtp_submit_run(smtp_submit, &error)) < 0) {
+		i_error("msgid=%s: Temporarily failed to send rejection: %s",
+			orig_msgid == NULL ? "" : str_sanitize(orig_msgid, 80),
+			str_sanitize(error, 512));
+	} else if (ret == 0) {
+		i_info("msgid=%s: Permanently failed to send rejection: %s",
+			orig_msgid == NULL ? "" : str_sanitize(orig_msgid, 80),
+			str_sanitize(error, 512));
+	}
+	smtp_submit_deinit(&smtp_submit);
+	return ret < 0 ? -1 : 0;
+}
diff --git a/src/lib-lda/mail-send.h b/src/lib-lda/mail-send.h
new file mode 100644
index 0000000..88f87ed
--- /dev/null
+++ b/src/lib-lda/mail-send.h
@@ -0,0 +1,11 @@
+#ifndef MAIL_SEND_H
+#define MAIL_SEND_H
+
+struct mail;
+struct mail_deliver_context;
+
+int mail_send_rejection(struct mail_deliver_context *ctx,
+			const struct smtp_address *recipient,
+			const char *reason);
+
+#endif