On 19/10/2022 15:25, Stefano Bagnara via mailop wrote:
On Wed, 19 Oct 2022 at 13:32, Heiko Schlittermann via mailop <mailop@mailop.org> wrote:A given mailhost (ran privately for smaller entities) can't send messages to T-Online anymore. 554 IP=168.119.159.241 - A problem occurred. …Do you get this error at the connection or after you transmitted the message? If you get the error after the "DATA" and "." then maybe you just need DKIM+DMARC compliance for your emails. In this case look for an old thread here: "DKIM+DMARC at t-online.de (Deutsche Telekom's ISP branche)" by florian.kun...@telekom.de (Apr 6 2021)
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