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The original was posted on /r/selfhosted by /u/Fromdozimomat on 2025-04-23 09:28:59+00:00.

Hey,

just wanted to share one of the stupidest things I econtered in over 30 years of network engineering…:

In Germany, if you want to send a mail with a correctly configured mailserver hosted in a big datacenter - also in germany - you have to register by email (!) [[email protected]](mailto:[email protected]) that you wish to be whitelisted.

But thats not all… Say, the mailserver is reachable at mxwhatever.whateverdomain.com you have to (!!!) host a https-Site on THAT domain (mxwhatever…) with contact Details of the person in charge.

Else they deny it…

Looks like this in the logs:

[111.11.111.1]:25, delay=0.18, delays=0.02/0.01/0.16/0, dsn=4.0.0, status=deferred (host mx00.t-online.de[194.25.134.8] refused to talk to me: 554 IP=111.111.11.111 - A problem occurred. Ask your postmaster for help or to contact [email protected] to clarify. (TEM))

So, Selfhosted email admins, please support this nonsense and write ALL an Email with you mailservers to [[email protected]](mailto:[email protected]) to get whitelisted!

If they get thounsands of Emails each day, maybe they wake up and consider this idea idiotic…