Hello, again wo can't send mails to part of our customers. Error Message returnes:
This message was created automatically by the SMTP relay on xxxx
A message that you sent could not be delivered to all of its recipients.
The following address(es) failed:
customers@xxx.de
SMTP error from remote mail server after end of data:
host mail.xxx: 550 Administrative prohibition
our Server is not blacklistet. Any ideas? Thank you
Found only the old topic, seams Sophos problem on blacklist...
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