[exim] DKIM verification and envelope-from

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Author: Robert Wysocki
Date:  
To: exim-users
Subject: [exim] DKIM verification and envelope-from
Hi there,

I'm trying to achieve configuration that would verify DKIM signatures
for known signers.
Everything works fine until envelope-from address is one of known
signers. But many spams have envelope-from set differently than From:
header, eg. injectingy472@??? in envelope-from and
something@??? in From: header.
This enables them to bypass DKIM signature checks and therefor to bypass
one of the anti-spam mechanisms.

How can I instruct exim to include From: headers' content in known
signers checks?

Regards,
--
Robert Wysocki
administrator systemów linuksowych
CONTIUM S.A., http://www.contium.pl