Server Fault Asked by user8056359 on January 24, 2021
Having read through many tutorials on configuring Postfix to pass mail to Dovecot-LMTP I am still quite confused as they are often contradictory.
Some tutorials say the following must be added:
virtual_transport = dovecot
dovecot_destination_recipient_limit = 1
Others say:
virtual_transport = lmtp:unix:private/dovecot-lmtp
And yet others say:
virtual_transport = lmtp:unix:private/lmtp
Some tutorials imply that nothing further needs to be added to the configuration file for Postfix to pass mail to Dovecot-LMTP but others instruct you add the following:
dovecot unix - n n - - pipe
flags=DRhu user=vmail:mail argv=/usr/lib/dovecot/dovecot-lda -d $(recipient)
How can I verify that Dovecot-LMTP is in fact being handed mail and that Postfix is not delivering it to mailboxes itself?
virtual_transport = dovecot
master.cf modification you mention is required only for non LMTP postfix's configuration
virtual_transport = lmtp:unix:...
The two remaining postfix configurations merely use slightly different LMTP socket name. They require modification of dovecot's configuration .
Dovecot should log on the log files (Debian => /var/log/mail.info) that has a message have been submitted and accepted via LMTP.
Documentation:
Dovecot Wiki2: Postfix and Dovecot LMTP
Basic postfix and dovecot configuration for integration via LMTP + rejecting email to non existing virtual users by postfix in RCPT TO: reply
Dovecot Wiki2: Postfix and Dovecot SASL
Making possfix use dovecot's passwords for SMTP AUTH
Answered by AnFi on January 24, 2021
It depends on how exactly you've configured it all to work together. My set up is similar to that as shown at workaround.org, here's what a message looks like in mail.log as it arrives from "out there" and is processed by postfix and dovecot using lmtp to pass it off. You can see the log entries for the lmtp pass off.
Jul 6 04:24:40 node3 postfix/smtpd[22238]: connect from sendinghostname[sendingip]
Jul 6 04:24:40 node3 postfix/smtpd[22238]: Anonymous TLS connection established from sendinghostname[sendingip]: TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)
Jul 6 04:24:40 node3 postfix/smtpd[22238]: DF2FE1EF3C: client=sendinghostname[sendingip]
Jul 6 04:24:40 node3 postfix/cleanup[22241]: DF2FE1EF3C: message-id=<e0f21d60-ea5d-4563-53d5-6e9450540655@sendingdomainname>
Jul 6 04:24:40 node3 spamd[8704]: spamd: connection from localhost [127.0.0.1]:44362 to port 783, fd 5
Jul 6 04:24:40 node3 spamd[8704]: spamd: processing message <e0f21d60-ea5d-4563-53d5-6e9450540655@sendingdomainname> for username:5000
Jul 6 04:24:41 node3 spamd[8704]: spamd: clean message (-0.0/5.0) for username:5000 in 0.3 seconds, 1576 bytes.
Jul 6 04:24:41 node3 spamd[8704]: spamd: result: . 0 - SPF_PASS scantime=0.3,size=1576,user=username,uid=5000,required_score=5.0,rhost=localhost,raddr=127.0.0.1,rport=44362,mid=<e0f21d60-ea5d-4563-53d5-6e9450540655@sendingdomainname>,autolearn=ham autolearn_force=no
Jul 6 04:24:41 node3 postfix/qmgr[3741]: DF2FE1EF3C: from=<username@sendingdomainname>, size=1789, nrcpt=1 (queue active)
Jul 6 04:24:41 node3 postfix/smtpd[22238]: disconnect from sendinghostname[sendingip] ehlo=2 starttls=1 mail=1 rcpt=1 data=1 quit=1 commands=7
Jul 6 04:24:41 node3 dovecot: lmtp(22244): Connect from local
Jul 6 04:24:41 node3 dovecot: lmtp(username@recipientdomain): qpVLDom7XVnkVgAAD1k5Pg: sieve: msgid=<e0f21d60-ea5d-4563-53d5-6e9450540655@sendingdomainname>: stored mail into mailbox 'INBOX'
Jul 6 04:24:41 node3 dovecot: lmtp(22244): Disconnect from local: Successful quit
Jul 6 04:24:41 node3 postfix/lmtp[22243]: DF2FE1EF3C: to=<username@recipientdomain>, relay=receivingservername[private/dovecot-lmtp], delay=0.35, delays=0.3/0.02/0.01/0.01, dsn=2.0.0, status=sent (250 2.0.0 <username@recipientdomain> qpVLDom7XVnkVgAAD1k5Pg Saved)
Jul 6 04:24:41 node3 postfix/qmgr[3741]: DF2FE1EF3C: removed
Jul 6 04:24:41 node3 spamd[8703]: prefork: child states: II
Answered by ivanivan on January 24, 2021
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