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Mail rejected "550 Administrative prohibition"

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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