Solved
blacklist
10 months ago
host
webmail.systemform-datenbelege.de[93.240.59.105] said: 550-Sophos Anti Spam
Engine has blocked this Email because the sender IP 550 Address is
blacklisted. (in reply to RCPT TO command)
Wer muss was run?
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Accepted Solution
accepted by
10 months ago
See
https://telekomhilft.telekom.de/t5/E-Mail/T-Online-auf-Blacklist-550-Sophos-Anti-Spam-Engine-Undelivered/m-p/5119290#M183277
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