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).
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? Thanks, Joachim
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