Mailing List Message #106274
From: Gib Henry <>
Subject: Bogus "non-existent domain in From:" bounce
Date: Wed, 14 Dec 2016 18:22:40 -0600
To: CommuniGate Pro Discussions <>

From time to time I receive copies of my server’s outgoing bounce messages (from mailerdaemon) with the offending incoming messages attached.  The reason stated for the bounce, in this case, is that there is a non-existent domain in the From: header of the incoming message.  However that is not true; the domain name does exist:

/usr/bin/host -t a has address

The log shows:

17:40:04.000 1 DEQUEUER [2420011] SYSTEM(gib) failed: non-existent domain ( in From:
17:40:04.802 2 SMTP-000007(*) [2420014] sent encrypted []:50534 -> []:2501, 
    got:250 4123891 message accepted for delivery

Do I have a DNS problem?  It happens too rarely to justify increasing the log level, but…?  Cheers,
Gib Henry

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