In the process of writing this email, I found the root cause of my
problem :) , but anyway if anybody suffers similarly, and Just For The
Record, I'll send it anyway, including the solution(s).
I have a multi-instance setup to do spam-filtering before I expand
aliases for a mailing-list. Mail submittet from MUA to internal users is
supposed to go postfix-external-submit -> postfix-relay ->
postfix-local-deliver.
I very rarely send mail internally, but today I got this error:
2025-04-14T13:04:17.489875+02:00 garbo
postfix-external-submit/qmgr[3582]: 6069A4848F08:
from=<ha...@alstadheim.priv.no>, size=1089, nrcpt=1 (queue active)
2025-04-14T13:04:17.498316+02:00 garbo
postfix-external-submit/local[21039]: 6069A4848F08: passing
<ha...@alstadheim.priv.no> to transport=smtp
2025-04-14T13:04:17.516132+02:00 garbo
postfix-external-submit/smtp[21040]: connect to
localhost[148.252.106.155]:10029: Connection refused
2025-04-14T13:04:17.522798+02:00 garbo
postfix-external-submit/smtp[21040]: 6069A4848F08:
to=<ha...@alstadheim.priv.no>, orig_to=<famil...@alstadheim.priv.no>,
relay=none, delay=0.13, delays=0.1/0.01/0.02/0, dsn=4.4.1,
status=deferred (connect to localhost[148.252.106.155]:10029: Connection
refused)
148.252.106.155 is the outside interface on my router. I have NO idea
how that address got picked up. postfix-external-submig had:
mailbox_transport = smtp:[localhost]:10029
When I changed it to:
mailbox_transport = smtp:[127.0.0.1]:10029
The mail went through. Still, I'm concerned how [localhost] got
translated to the outside interface. If I do "dig alstadheim.priv.no" on
my mailserver, I get that wrong address, from the global DNS-system, but
that should have no bearing on looking up "localhost" however, and this
is THE SOLUTION:
i had this in /etc/hosts:
127.0.0.1 localhost
Changed to
127.0.0.1 localhost localhost.alstadheim.priv.no
Problem fixed, I believe.
So, evidently localhost gets looked up as localhost.alstadheim.priv.no
when connecting to the mailbox transport.
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