I've noticed that my maccheck logs are full of ANY_BOUNCE_MESSAGE hits and this is due that trap sensor MTAs empty env-sender to deliver (to avoid possible backscatter) so the masschecker sees:

"Return-Path: <>"  and thinks it's a bounce.


Wondering if & how this could affect overall ruleqa when so many ANY_BOUNCE_MESSAGE hits start showing up.

Any idea how to avoid it without touching the sender MTA?

Hmm, that sounds like you are modifying the envelope header and that will skew things. Is the information still in the email or has the MTA completely sanitized it?

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