Dear all, good afternoon. I would like some help with the error of a Saas application trying to do an SMTP Relay using Exchange online. The following error is returned:
----- The following addresses had permanent fatal errors -----
postmaster@localhost
(reason: 530 5.7.57 Client not authenticated to send mail.
Ensure that SMTP authentication is enabled in your SaaS application. This might involve configuring the application to use the correct authentication method (e.g., Basic Authentication, OAuth)
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