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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Sendmail queue files: “Mhost map: lookup” deferred

Posted by jpluimers on 2022/02/22

I had forgotten about sendmail mail queue entries that start with Mhost map: lookup.

It it happens for all email then you have a DNS problem.

When it happens only for a few emails, then usually that domain is gone (often because of SPAM reasons).

via: [Wayback] “Mhost map: lookup” – Google Search

–jeroen

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