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jgiannerini asked on

dsn=5.1.1, stat=User unknown

I have a linux machine configured to send emails to our vessels, but now they aren't working anymore. I think they aren't accepting messages because our linux machine is not configured as an mx.

Take a look at log file /var/log/maillog
Jul 13 10:02:23 intra sendmail[27973]: p6DD2NA5027973: from=star, size=187307, class=0, nrcpts=1, msgid=<20110713130222.GA27971@intra>, relay=star@localhost
Jul 13 10:02:23 intra sendmail[27974]: p6DD2Na5027974: from=<star@intra.norsul.com>, size=187465, class=0, nrcpts=1, msgid=<20110713130222.GA27971@intra>, proto=ESMTP, daemon=MTA, relay=intra.norsul.com []
Jul 13 10:02:23 intra sendmail[27973]: p6DD2NA5027973: to=nstppxc@norsul.amosconnect.com, ctladdr=star (501/501), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=217307, relay=[] [], dsn=2.0.0, stat=Sent (p6DD2Na5027974 Message accepted for delivery)
Jul 13 10:02:28 intra sendmail[27976]: p6DD2Na5027974: to=<nstppxc@norsul.amosconnect.com>, ctladdr=<star@intra.norsul.com> (501/501), delay=00:00:05, xdelay=00:00:05, mailer=esmtp, pri=307465, relay=relay1.station12.com. [], dsn=5.1.1, stat=User unknown
Jul 13 10:02:29 intra sendmail[27976]: p6DD2Na5027974: p6DD2Ta5027976: DSN: User unknown
Jul 13 10:02:29 intra sendmail[27976]: p6DD2Ta5027976: to=<star@intra.norsul.com>, delay=00:00:00, xdelay=00:00:00, mailer=local, pri=218717, dsn=2.0.0, stat=Sent

When I send to my company email (exchange) and to my personnal email (gmail) there is no matter, it only occours when I try to send to the vessels, who is configured to domain norsul.amosconnect.com

Do you have an idea how to solve this problem?

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8/22/2022 - Mon

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Configured sendmail to relay messages to exchange.

Note that an email to user@norsul.amosconnec.com is not being seen as internal/local/virtual and is being sent through to relay1.station12.com whose mail server is rejecting the email with the user unknown and not your server.

If this email should be handled internally to the intra server, you have to make sure that the domain is defined as local/virtual etc.
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