On 12.07.19 16:47, Deeztek Support wrote:
BUT...  amavis identifies the address by matching the envelope sender OR
the From: header sender.  So (in theory) a spammer can easily fake the
envelope sender and get whitelisted.

I was under the impression that amavis uses the Return-Path header and not the 
From header.

It's actually envelope from header.
Yes, amavis uses that one.

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