Re: [exim] Trying to block by Reply-To/From headers match

In addition to Alex's response,

On 16/01/2021 02:25, Konstantin Boyandin via Exim-users wrote:
> As far as I understood, the above only filters by the address reported
> in "MAIL FROM" SMTP command

Yes

> (i.e., by Return-Path),

Possibly added by a transport - not necessarily present in an
incoming message

> which can be bogus.

Anything in an inbound message can be bogus - including the From:
header. It's just as easy to forge as the envelope FROM.
--
Cheers,
Jeremy