Hello,
I upgraded my OpenBSD 6.4 MX server running OpenSMTPD 6.4 to OpenBSD 6.5
running OpenSMTPD 6.5 but unfortunately had to revert back to 6.4 because mail
delivery to Dovecot using LMTP did not work anymore. Is it possible that LMTP
mail delivery is broken in OpenSMTPD 6.5?
In my smtpd.conf file I use:
action "lmtp_dovecot" lmtp "/var/dovecot/lmtp" rcpt-to virtual <vusers>
The relevant error log entry of OpenSMTPD is:
May 22 21:49:08 mx1 smtpd[45250]: dfc2d91c04922d88 mda delivery
evpid=7f51132de0fd58db from=<some...@domain.tld> to=<m...@mydomain.tld>
rcpt=<m...@mydomain.tld> user=vmail delay=1s result=PermFail stat=Error
("mail.lmtp: LMTP server error: 451 4.4.0 Remote server not answering
(connect)")
In the log file of Dovecot I don't see anything particular but just some
information about the connection:
May 22 21:49:07 mx1 dovecot: lmtp(61415): Connect from local
May 22 21:49:08 mx1 dovecot: lmtp(61415): Disconnect from local: Remote closed
connection (state=READY)
I ran a tcpdump on port 24 (Dovecot LMTP port) and could see that the mail
delivery never goes past these two first commands:
LHLO mx1.mydomain.tld
XCLIENT HELO=localhost TTL=5
In fact it seems to be trying in a loop to connect and always run LHLO and
XCLIENT but never goes further to actually issuing the mail.
Running "ps auxwww | grep lmtp" shows me that mail.lmtp is running but never
manages to deliver the mail successfully:
vmail 19798 0.0 0.1 248 1172 ?? I 10:03PM 0:00.00
/usr/libexec/mail.lmtp -f some...@domain.tld -d /var/dovecot/lmtp
m...@mydomain.tld
Any ideas what could be going wrong here? or is it possibly a bug in 6.5?
Best regards,
Mabi
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