It looks like google did increase the requirements for incoming E-Mails to them.
https://blog.google/products/gmail/gmai ... rotection/
for example, they want a dkim or at least strongly advise it.
Also our reverse-DNS Entrys for the smtp.gentoo.org server, doesnt show smtp.gentoo.org like it calls itself during submissions on the ipv6 Adresses (which gmail accepts), only woodpecker.gentoo.org.
And on a personal Note:
If Google is breaking this for multiple senders, that suggests this is a Google problem, not a sender problem. The sender might or might not have relevant data in their logs, but Google should have a log of what happened.
probably. But you cant hide behind that shield if you also doesn't include todays standard in that, if your servers doesnt use something developed 30 years ago to help decrease spam mails. Like server naming through proper dns to submissions or at least dkim it from your outgoing servers (developed 10 years ago).
(Did you look in your E-Mail Headers outgoing? How much another server "doesn't know" who the server speaking to them is?)
Code: Select all
Recieved: from goshawk.gentoo.org (unknown [140.211.166.177]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by smtp.gentoo.org (Postfix) with ESMTPS id 34F4134336D for <some-name-here@web.de>; Mon, 29 Jan 2024 18:10:50 +0000 (UTC)
for reference, a nopaste
https://nopaste.net/WtElwRZR2x