make Postfix -> Dovecot delivery over LMTP (was LDA) (#305) (#360)

Dockerfile

@@ -13,6 +13,7 @@ RUN DEBIAN_FRONTEND=noninteractive apt-get update -q --fix-missing && \
     curl \
     dovecot-core \
     dovecot-imapd \
+    dovecot-lmtpd \
     dovecot-managesieved \
     dovecot-pop3d \
     dovecot-sieve \

target/dovecot/10-master.conf

@@ -47,7 +47,8 @@ service pop3-login {
 
 service lmtp {
   unix_listener lmtp {
-    #mode = 0666
+    mode = 0660
+    group = postfix
   }
 
   # Create inet listener only if you can't use the above UNIX socket

target/dovecot/20-lmtp.conf

@@ -0,0 +1,19 @@
+##
+## LMTP specific settings
+##
+
+# Support proxying to other LMTP/SMTP servers by performing passdb lookups.
+#lmtp_proxy = no
+
+# When recipient address includes the detail (e.g. user+detail), try to save
+# the mail to the detail mailbox. See also recipient_delimiter and
+# lda_mailbox_autocreate settings.
+#lmtp_save_to_detail_mailbox = no
+
+# Verify quota before replying to RCPT TO. This adds a small overhead.
+#lmtp_rcpt_check_quota = no
+
+protocol lmtp {
+  # Space separated list of plugins to load (default is global mail_plugins).
+  mail_plugins = $mail_plugins sieve
+}

target/postfix/main.cf

@@ -58,14 +58,10 @@ smtpd_sasl_local_domain = $myhostname
 broken_sasl_auth_clients = yes
 
 # Mail directory
-virtual_mailbox_base = /var/mail
+virtual_transport = lmtp:unix:/var/run/dovecot/lmtp
 virtual_mailbox_domains = /etc/postfix/vhost
 virtual_mailbox_maps = hash:/etc/postfix/vmailbox
 virtual_alias_maps = hash:/etc/postfix/virtual
-virtual_uid_maps = static:5000
-virtual_gid_maps = static:5000
-# Enable Dovecot Sieve
-virtual_transport = dovecot
 
 # Additional option for filtering
 content_filter = smtp-amavis:[127.0.0.1]:10024

target/postfix/master.cf

@@ -45,7 +45,7 @@ retry     unix  -       -       -       -       -       error
 discard   unix  -       -       -       -       -       discard
 local     unix  -       n       n       -       -       local
 virtual   unix  -       n       n       -       -       virtual
-lmtp      unix  -       -       -       -       -       lmtp
+lmtp      unix  -       -       n       -       -       lmtp
 anvil     unix  -       -       -       -       1       anvil
 scache    unix  -       -       -       -       1       scache
 
@@ -63,12 +63,6 @@ mailman   unix  -       n       n       -       -       pipe
   flags=FR user=list argv=/usr/lib/mailman/bin/postfix-to-mailman.py
   ${nexthop} ${user}
 
-#
-# Dovecot LDA configuration
-#
-
-dovecot unix    -       n       n       -       -      pipe
-  flags=DRhu user=docker argv=/usr/lib/dovecot/deliver -f ${sender} -d ${user}@${nexthop} -m ${extension}
 
 #
 # Amavis configuration

test/tests.bats

@@ -149,7 +149,7 @@
 }
 
 @test "checking smtp: delivers mail to existing account" {
-  run docker exec mail /bin/sh -c "grep 'status=sent (delivered via dovecot service)' /var/log/mail/mail.log | wc -l"
+  run docker exec mail /bin/sh -c "grep 'postfix/lmtp' /var/log/mail/mail.log | grep 'status=sent' | grep ' Saved)' | wc -l"
   [ "$status" -eq 0 ]
   [ "$output" -eq 6 ]
 }