Hi all, I believe, I found the reason, why mails are marked as spam and others not.
All spam mails shjow this entry in the header: --- sninp --- Authentication-Results: mail35c50.megamailservers.eu; spf=none smtp.mailfrom=lists.debian.org Authentication-Results: mail35c50.megamailservers.eu; dkim=fail reason="signature verification failed" (2048-bit key) header.d=debian.org header.i=@debian.org header.b="pDp/TPD5" Return-Path: <bounce-debian-devel=hans.ullrich=loop...@lists.debian.org> Received: from bendel.debian.org (bendel.debian.org [82.195.75.100]) by mail35c50.megamailservers.eu (8.14.9/8.13.1) with ESMTP id 425I9ZEK112497 for <hans.ullr...@loop.de>; Tue, 5 Mar 2024 18:09:37 +0000 --- snap --- White mails get the dkim=pass and spam mails got dkim=fail (as you see above). However, I am not much experienced with DKIM, but as far as I read, it has soemthing to do with key exchanges. But who must exchange keys? I see also bendel.debian.org and a bounce message. Can that be the reason, that bendel.debian.org and megameilservers.eu has some problems with the keys? On both I can not take a look and have no influence to it, but mayme the admins of bendel.debian.org do know more. Thanks for reading this, Best regards Hans