I am having problems comfiguring Postfix and Dovecot to communicate via lmtp on
Ubuntu.
The following is an excerpt of my Dovecot configuration:
protocols = imap lmtp
protocol lmtp {
postmaster_address = [email protected] # required
mail_plugins = quota sieve
lmtp_rawlog_dir = /var/log/dovecot-lmtp
}
service lmtp {
inet_listener lmtp {
address = *
port = 24
}
unix_listener /var/spool/postfix/private/lmtp {
group = postfix
mode = 0660
user = postfix
}
}
The following is an exceprt of my Postfix configuration:
virtual_transport = lmtp:unix:private/lmtp
mailbox_transport = lmtp:unix:private/lmtp
The following are the lmtp sockets that got created automatically when I
started Dovecot. (I am not sure why the first socket is getting created.)
srw-rw-rw- 1 root root 0 Mar 31 13:44 /var/run/dovecot/lmtp
srw-rw---- 1 postfix postfix 0 Mar 31 13:44 /var/spool/postfix/private/lmtp
I have successfully used socat to submit an email to Dovecot using lmtp, and
Thunderbird showed this email in my Inbox, so I am fairly sure that Dovecot is
correctly configured and that the problem is with Postfix.
# socat - UNIX-CONNECT:/var/spool/postfix/private/lmtp
220 Pluto Dovecot (Ubuntu) ready.
lhlo wiskit.com
250-Pluto
250-8BITMIME
250-CHUNKING
250-ENHANCEDSTATUSCODES
250-PIPELINING
250 STARTTLS
mail from:<[email protected]>
250 2.1.0 OK
rcpt to:<herbw>
250 2.1.5 OK
data
354 OK
From: Herb Weiner <[email protected]>
To: Herb Weiner <[email protected]>
Subject: Testing lmtp using socat
This is a test email
.
250 2.0.0 <herbw> ABkiC7MJ62daCwAARkBUVA Saved
quit
221 2.0.0 Bye
The verbose logs in /var/log/dovecot-lmtp all show the same pattern:
-rw------- 1 root root 0 Mar 31 15:32 20250331-153257.3510.7.in
-rw------- 1 root root 53 Mar 31 15:32 20250331-153257.3510.7.out
# cat 20250331-153257.3510.7.out
1743460377.751537 220 Pluto Dovecot (Ubuntu) ready.
1743460677.851664 421 4.4.2 Pluto Disconnected for inactivity
The following is an excerpt from my /var/log/mail.log:
2025-03-31T15:32:57.690248-07:00 Pluto postfix/qmgr[2346]: BCA7B2B41147:
from=<[email protected]>, size=612, nrcpt=2 (queue active)
2025-03-31T15:32:57.696541-07:00 Pluto postfix/qmgr[2346]: 947212B406A4:
from=<[email protected]>, size=581, nrcpt=2 (queue active)
2025-03-31T15:32:57.696791-07:00 Pluto postfix/local[3507]: BCA7B2B41147:
passing <[email protected]> to transport=lmtp
2025-03-31T15:32:57.731171-07:00 Pluto postfix/local[3508]: warning: unexpected
end-of-input from private/lmtp socket while reading input attribute name
2025-03-31T15:32:57.731248-07:00 Pluto postfix/local[3508]: warning:
private/lmtp socket: malformed response
2025-03-31T15:32:57.750433-07:00 Pluto postfix/local[3508]: F1FF52B407F4:
to=<[email protected]>, relay=none, delay=249764,
delays=249464/0.07/0/300, dsn=4.3.0, status=deferred (mail transport
unavailable)
2025-03-31T15:32:57.751092-07:00 Pluto postfix/local[3508]: 947212B406A4:
passing <[email protected]> to transport=lmtp
2025-03-31T15:37:57.798352-07:00 Pluto postfix/local[3507]: warning: unexpected
end-of-input from private/lmtp socket while reading input attribute name
2025-03-31T15:37:57.834555-07:00 Pluto postfix/local[3507]: warning:
private/lmtp socket: malformed response
2025-03-31T15:37:57.834782-07:00 Pluto postfix/qmgr[2346]: 1CA0B2B407EF:
from=<[email protected]>, size=608, nrcpt=2 (queue active)
2025-03-31T15:37:57.851977-07:00 Pluto postfix/local[3508]: warning: unexpected
end-of-input from private/lmtp socket while reading input attribute name
2025-03-31T15:37:57.852038-07:00 Pluto postfix/local[3508]: warning:
private/lmtp socket: malformed response
2025-03-31T15:37:57.853270-07:00 Pluto postfix/local[3507]: BCA7B2B41147:
to=<[email protected]>, relay=none, delay=72387, delays=72087/0.01/0/300,
dsn=4.3.0, status=deferred (mail transport unavailable)
I'd be happy to supply any other configuration details or log output, test any
configuration changes, or enable any additional debugging. Thanks for your
assistance.
Herb
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