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Upd !!better!! — Delivery Temporarily Suspended Unknown Mail Transport Error Postfix

You are likely using a content filter (like SpamAssassin, ClamAV, Amavisd-new, or a custom Python/Perl script) defined in master.cf . If that script:

To the uninitiated, this is just a line in a log file. To those who have stared at a frozen email queue at 2 AM, it is a modern haiku of helplessness. It tells you something is wrong, but refuses to say what. It promises a future resolution ("temporarily"), yet offers no path to get there. It is the error message as existential riddle. You are likely using a content filter (like

Check postconf -n | grep transport to see your active transport settings. You are likely using a content filter (like

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delivery temporarily suspended unknown mail transport error postfix upd