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Postfix Documentation
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The Postfix before-queue content filter feature

As of version 2.1, the Postfix SMTP server can forward all incoming mail to a content filtering proxy server that inspects all mail BEFORE it is stored in the Postfix mail queue.

The before-queue content filter is meant to be used as follows:

Internet -> Postfix SMTP server -> Before queue filter -> Postfix SMTP server -> Postfix cleanup server -> Postfix queue -< smtp
local
virtual

The before-queue content filter is not to be confused with the approach described in the FILTER_README document, where mail is filtered AFTER it is stored in the Postfix mail queue.

This document describes the following topics:

Postfix Documentation
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