Merge pull request #5696 from mailcow/fix/netfilter

[Netfilter] add mailcow isolation rule to MAILCOW chain

data/conf/dovecot/dovecot.conf

@@ -247,6 +247,9 @@ plugin {
   mail_log_events = delete undelete expunge copy mailbox_delete mailbox_rename
   mail_log_fields = uid box msgid size
   mail_log_cached_only = yes
+
+  # Try set mail_replica
+  !include_try /etc/dovecot/mail_replica.conf
 }
 service quota-warning {
   executable = script /usr/local/bin/quota_notify.py