I have Postfix configured to block email from a persistent spammer that has found a "bulletproof" spam service provider (known as Amazon SES), but of course the block fails because the MAIL FROM (aka "Return-Path") is a string such as
firstname.lastname@example.org while the
From header passed in the DATA command is
Is there a way to block the address/domain in the
From header during the SMTP transaction, rather than filtering it to
/dev/null with some after-the-fact process like Sieve, Amavis, Spamassassin, etc.?
This answer suggests it's not possible, but then goes on to emphasise a different point that is not relevant to my question, so it's not clear to me that it is absolutely not possible.
I don't think my
postconf output is relevant to this question, as Postfix is running as it should be (I'm running 2.10.1.). I'm looking for a configuration tweak. Thanks.