Outgoing e-mail cannot be sent

This help center article refers to the following products:
Email Protection โ†’ Send Connectors

Error message

553 5.7.1 <info@meine-domain.de>: Sender address rejected: not owned by user username@mai.out.creoline.de


This error occurs if a domain is used as the sender e-mail address that does not have sender rights for this send connector.


The domain of the sender e-mail address must be added to the list of authorized domains.

Detailed step-by-step instructions can be found in the article Sendeconnectors.

Which sender e-mail addresses can I use?

One of the authorized domains must be used for outgoing e-mails. In addition, the successful verification of ownership must be given.