Error on setting up mail server

Error on setting up mail server

We are testing Opmanager at an external site and when I want to send a test message to an address outside of that domain, it gives this error:
Invalid Addresses; nested exception is: class javax.mail.SendFailedException: 550 5.7.1 Unable to relay for (outside email address)

If we use an email address that is inside that domain, it works perfectly.


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