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Max Muster
Asked: 2021-11-04 02:26:12 +0800 CST

postfix : how to check the "from" server ip match server domain for all hops

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I recieve spam emails where the sender server ip does not match the named domain like this examples:

Return-Path: <[email protected]>
[...]
From: "Sparkasse informiert" <[email protected]>
[...]
Received: from amdir.dtfibre.fr (amdir.dtfibre.fr [199.101.190.36])
    by my.example.com (my.example.com) with ESMTPS id 1DDEC74013E
    for <[email protected]>; Wed,  3 Nov 2021 07:16:12 +0100 (CET)
Received: from [127.0.0.1] (unknown [178.159.123.178])
    by amdir.dtfibre.fr (Postfix) with ESMTPSA id 7E85B87E6F
    for <[email protected]>; Wed,  3 Nov 2021 00:36:49 -0400 (AST)

the problem is that the host of 178.159.123.178 is not "unknown", it is "pool.sevtele.com"

what settings can I make to postfix to reject/drop such emails?

postfix

0 Answers