I have the same problem. My master.cf has no line mentioning "dovecot-lmtp".
My main.cf has line "mailbox_transport = lmtp:unix:/var/spool/postfix/private/dovecot-lmtp". When upgrading Postfix, the process modified my "master.cf" from "lmtp unix - - n - - lmtp" to "lmtp unix - - n - - smtp". -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1654453 Title: LMTP delivery to Dovecot stops working in 3.1.4-1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/postfix/+bug/1654453/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs