> There's some ability, native to Amavis, to whitelist an IP, from what I 
> understand, but no ability to white-list a sender's email address in Amavis 
> itself.

Doesn't the Amavis wblist MySQL table or the @whitelist_sender_maps directive 
provide that very functionality that you say is missing?

> And yes, I do understand that sender addresses can be forged, and often are - 
> and that this makes this type of white-list less secure.

Which is why the Return-Path in combination with the X-Envelope-To  is used in 
black/white listings

Maybe I'm way off here, feel free to correct me.




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