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I'm interested in implementing the advanced content filter example for postfix.

socat tcp-listen:10026,reuseaddr,fork tcp:localhost:10025

This is a simple "passthru" that works, but obviously doesn't do any filtering or responding.

My goal is to have this socat command work exactly as it does (two-way forwarding between the two connections), but also one-way forward its input to a PHP script.

How would I do that?

Possible duplicate question (unanswered as of today)

For more background... I would like to avoid the limitations of the "simple" content filter via pipe but I don't want to implement a full SMTP client and server to handle the postfix <--> filter <--> postfix transaction.

I do not need to filter the mail, but I do need to track it. My thought is that I could forward the network traffic per usual, but have a PHP script that tracks the data passing over the wire.

  • 1
    another way might be to use a milter in postfix – thrig Feb 12 '18 at 3:05
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You could simply add -v to socat and it will copy all i/o to stderr, prefixed by > or < to indicate the direction.

  • I ended up using xinetd and PHP sockets, but this was very helpful in helping me move toward that solution. Thank you! – jchook Feb 15 '18 at 5:57

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