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Postfix Documentation
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Postfix fast ETRN service limitations

The design of the flush(8) server and of the flush queue introduce a few limitations that should not be an issue unless you want to turn on fast ETRN service for every possible destination.

  • The flush(8) daemon maintains per-destination logfiles with queue file names. When a request to "deliver mail now" arrives, Postfix will attempt to deliver all recipients in the queue files that have mail for the destination in question. This does not perform well when queue files have recipients in many different domains.

  • The flush(8) daemon maintains per-destination logfiles only for destinations listed with $ fast_flush_domains. With other destinations it not possible to trigger delivery with "sendmail -qRdestination" or, with Postfix version 1.1 and later, "postqueue -sdestination".

  • Up to and including early versions of Postfix version 2.1, the "fast flush" service may not deliver some messages if the request to "deliver mail now" is received while a deferred queue scan is already in progress. The reason is that the queue manager does not ignore the volatile in-memory list of dead domains, and the list of message delivery transports specified with the defer_transports configuration parameter.

Postfix Documentation
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