Web Reference: Introduction This document requires Postfix version 2.1 or later. Normally, Postfix receives mail, stores it in the mail queue and then delivers it. With the external content filter described here, mail is filtered AFTER it is queued. Sep 27, 2022 · I'm looking to set up a simple Postfix server that can modify the content and recipient of some specific SMTP messages. I'm not super confident in my approach so far and feel like I missing some basics of how Postfix does stuff, so I'm hoping to get some guidance. Jul 30, 2021 · In general, you have the following options. You may set up the first content filter so it'll not inject data directly back into Postfix, but it will give it to second content filter. Then it can give it further, and only the last filter in the chain will inject mail back into Postfix.
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