My mailcow server (VPS with correct DNS-Setup) hat issues to delive to t-online.de mailboxes.
Error message from postfix:
3C26B72E69: to=<firstname.lastname@example.org>, relay=mx02.t-online.de[188.8.131.52]:25, delay=59544, delays=59542/0.99/0.88/0, dsn=4.0.0, status=deferred (host mx02.t-online.de[184.108.40.206] refused to talk to me: 554 IP=x.x.x.x - A problem occurred. (Ask your postmaster for help or to contact email@example.com to clarify.) (BL))
Does someone have any idea how to solve this?