Failed to connect to email server. : 535 5.7.3 Authentication unsuccessful

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getting the following error: Failed to connect to email server. : 535 5.7.3 Authentication unsuccessful [MAXP287CA0020.INDP287.PROD.OUTLOOK.COM 2025-02-28T05:40:07.959Z 08DD577E0263A89B]   while connecting to Azure directory with the OAuth configuration in email connector module .   can someone help me in finding out solution for this
asked
2 answers
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As a recommendation, please note that Microsoft disables Authenticated SMTP by default for all mailboxes. Even if you are using a valid OAuth token, SMTP authentication will fail if this setting is not enabled.


To fix this, go to the Microsoft 365 Admin Center → Users → Active users, select the mailbox used by Mendix, open the Mail tab, and click Manage email apps. Make sure Authenticated SMTP is enabled and saved.


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Ensure that the below:

  • You are using corrent username and password
  • Server is allowed to send email as white lsited from Exchange
  • SMTP URL and port is enabled
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