On 2024-02-12 at 07:07:03 UTC-0500 (Mon, 12 Feb 2024 13:07:03 +0100)
Joachim Lindenberg via Postfix-users <[email protected]>
is rumored to have said:
I haven´t seen this before, but at present my mail server is kind of
alternating between mail.example.com and the real hostname (or someone
is spoofing my IP-address which I doubt).
It is not at all clear what you actually mean by that. Any MTA has a
potentially complicated collection of different "identities" used in
different context. E.g. in Postfix you've got origin domain names,
destination domain names, hostnames used in MX records, and a hostname
used in HELO/EHLO greetings.
Or is the 'alternating' happening in DNS? We cannot know...
All configuration files I checked indicate the correct setting and
postconf myhostname returns the correct name. Thus I am wondering
whether this might be caused by a recent change of postfix, which
happens tob e 3.5.23 – the mail server is a mailcow-dockerized
instance which still uses images based on debian-bullseye.
Any idea for the cause and a fix?
My guess: Gremlins.
You might get more useful answers by including the illuminating
information described at https://www.postfix.org/DEBUG_README.html#mail
in the section titled "Reporting problems to [email protected]"
--
Bill Cole
[email protected] or [email protected]
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
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