Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: AMM <anon.amish@gmail.com>
Newsgroups: comp.mail.sendmail
Subject: How to know local IP on which mail was received on
Date: Wed, 11 Dec 2024 10:59:30 +0530
Organization: A noiseless patient Spider
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Hello

So I have two IPs configured on my mail server (acting as MX for my domain).

Say public IPs are 1.2.3.4 (eth1) and 5.6.7.8 (eth2)

When I receive email, system logs sender IP but does not log on what IP 
the email was received on.

Log line looks like this:

Dec 11 08:26:48 foo1 sm-mta[1707322]: STARTTLS=server, 
relay=mail-ed1-f41.google.com [209.85.208.41], version=TLSv1.3, 
verify=NOT, cipher=TLS_AES_256_GCM_SHA384, bits=256/256

How do I know if email came on 1.2.3.4 (eth1) or 5.6.7.8 (eth2)?

I want to debug some issue which requires to know local IP the email 
came on.

Please do let me know, how to check the same.

Thank you,

AMM