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Our postfix logs are being filled with messages that appear to be stuck in the mail queue.

I believe this may have been caused by a recent DNS outage. The offending mail was originally intended for node@hostname but postfix was unable to resolve its own domain.

However, what I don't understand is why the messages have been prefixed with owner-owner-owner-owner-owner-. This is repeated hundreds of times - the mail address is so long that the postfix logs truncate it so I can't even see the original address without using mailq.

Does anyone know why this happens? What is postfix trying to achieve by prefixing with owner and how do I prevent this from happening again?

SystemParadox
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  • I don't know the answer, but does the condition persist if you clear the queue? – Paul Jan 28 '22 at 13:16
  • I cleared these messages from the queue and they haven't come back since, which does suggest the DNS outage was the trigger for this. I would still like to understand what postfix was doing though. – SystemParadox Jan 29 '22 at 15:32

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