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Problems of a user sending emails to external domains

There are problems with sending mail to external mail from my domain.

The Outlook message states:

Error: 550 5.7.1 Command rejected
Message rejected by:

Only that user has the problem, the other users are working no

Added tags
[edited by: Raphael Alganes at 1:24 AM (GMT -7) on 7 Sep 2023]
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