switched to dovecot LDA as mail delivery agent to allow use of X-Original-To header for mail filtering

src/mailsrv/assets/dovecot/conf.d/15-lda.conf

@@ -0,0 +1,48 @@
+##
+## LDA specific settings (also used by LMTP)
+##
+
+# Address to use when sending rejection mails.
+# Default is postmaster@%d. %d expands to recipient domain.
+#postmaster_address =
+
+# Hostname to use in various parts of sent mails (e.g. in Message-Id) and
+# in LMTP replies. Default is the system's real hostname@domain.
+#hostname = 
+
+# If user is over quota, return with temporary failure instead of
+# bouncing the mail.
+#quota_full_tempfail = no
+
+# Binary to use for sending mails.
+#sendmail_path = /usr/sbin/sendmail
+
+# If non-empty, send mails via this SMTP host[:port] instead of sendmail.
+#submission_host =
+
+# Subject: header to use for rejection mails. You can use the same variables
+# as for rejection_reason below.
+#rejection_subject = Rejected: %s
+
+# Human readable error message for rejection mails. You can use variables:
+#  %n = CRLF, %r = reason, %s = original subject, %t = recipient
+#rejection_reason = Your message to <%t> was automatically rejected:%n%r
+
+# Delimiter character between local-part and detail in email address.
+recipient_delimiter = -
+
+# Header where the original recipient address (SMTP's RCPT TO: address) is taken
+# from if not available elsewhere. With dovecot-lda -a parameter overrides this. 
+# A commonly used header for this is X-Original-To.
+lda_original_recipient_header = X-Original-To
+
+# Should saving a mail to a nonexistent mailbox automatically create it?
+lda_mailbox_autocreate = yes
+
+# Should automatically created mailboxes be also automatically subscribed?
+lda_mailbox_autosubscribe = yes
+
+protocol lda {
+  # Space separated list of plugins to load (default is global mail_plugins).
+  mail_plugins = $mail_plugins sieve
+}

src/mailsrv/assets/postfix/main.cf

@@ -5,7 +5,7 @@ mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
 inet_interfaces = all
 inet_protocols = all
 # what backend to use to deliver local & virtual mail
-local_transport = lmtp:unix:private/dovecot-lmtp
+local_transport = dovecot
 # hosts to relay for
 relayhost =
 # whether to send "new mail" notifications to users

src/mailsrv/assets/postfix/master.cf

@@ -56,52 +56,5 @@ postlog   unix-dgram n  -       n       -       1       postlogd
 # and other message envelope options.
 # ====================================================================
 #
-# maildrop. See the Postfix MAILDROP_README file for details.
-# Also specify in main.cf: maildrop_destination_recipient_limit=1
-#
-maildrop  unix  -       n       n       -       -       pipe
-  flags=DRhu user=vmail argv=/usr/bin/maildrop -d ${recipient}
-#
-# ====================================================================
-#
-# Recent Cyrus versions can use the existing "lmtp" master.cf entry.
-#
-# Specify in cyrus.conf:
-#   lmtp    cmd="lmtpd -a" listen="localhost:lmtp" proto=tcp4
-#
-# Specify in main.cf one or more of the following:
-#  mailbox_transport = lmtp:inet:localhost
-#  virtual_transport = lmtp:inet:localhost
-#
-# ====================================================================
-#
-# Cyrus 2.1.5 (Amos Gouaux)
-# Also specify in main.cf: cyrus_destination_recipient_limit=1
-#
-#cyrus     unix  -       n       n       -       -       pipe
-#  user=cyrus argv=/cyrus/bin/deliver -e -r ${sender} -m ${extension} ${user}
-#
-# ====================================================================
-# Old example of delivery via Cyrus.
-#
-#old-cyrus unix  -       n       n       -       -       pipe
-#  flags=R user=cyrus argv=/cyrus/bin/deliver -e -m ${extension} ${user}
-#
-# ====================================================================
-#
-# See the Postfix UUCP_README file for configuration details.
-#
-uucp      unix  -       n       n       -       -       pipe
-  flags=Fqhu user=uucp argv=uux -r -n -z -a$sender - $nexthop!rmail ($recipient)
-#
-# Other external delivery methods.
-#
-ifmail    unix  -       n       n       -       -       pipe
-  flags=F user=ftn argv=/usr/lib/ifmail/ifmail -r $nexthop ($recipient)
-bsmtp     unix  -       n       n       -       -       pipe
-  flags=Fq. user=bsmtp argv=/usr/lib/bsmtp/bsmtp -t$nexthop -f$sender $recipient
-scalemail-backend unix  -       n       n       -       2       pipe
-  flags=R user=scalemail argv=/usr/lib/scalemail/bin/scalemail-store ${nexthop} ${user} ${extension}
-mailman   unix  -       n       n       -       -       pipe
-  flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py
-  ${nexthop} ${user}
+dovecot   unix  -       n       n       -       -       pipe
+  flags=DROhu user=vmail:vmail argv=/usr/lib/dovecot/dovecot-lda -f ${sender} -d ${user}@${nexthop}

src/mailsrv/docs/Future.md

@@ -0,0 +1,5 @@
+# future changes
+
+once Postfix 3.5 is on stable, we can use the X-Original-To header with LMTP as well. Simply add the "flags=O" argument to the `lmtp` line in `master.cf`, and change `local_transport` in `main.cf` to be `lmtp:unix:private/dovecot-lmtp` and also add the parameter `lmtp_recipient_limit = 1` to `main.cf` as well. Also, feel free to delete the `15-lda` config file from the git for dovecot
+
+alternatively, could potentially use the `envelope-dsn` extension of Sieve if it is added to Pigeonhole