Error When Testing SMTP for Django Website

Question

I'm trying to link my email to my Django website via SMTP for sending newsletters to subscribers. However, when I try to test sending the email, I receive the following error message:

(535, b"5.7.139 Authentication unsuccessful, user is locked by your organization's security defaults policy. Contact your administrator. [MN2PR20CA0024.namprd20.prod.outlook.com 2023-12-27T04:58:32.658Z 08DC052365A41D9B]")

Note that I have already checked the Authenticated SMTP option for my account in the Microsoft 365 admin center. Any suggestions on how to fix this error?

Answer 1

Hi @Wencong Cui,

From the error message it seems Django Website is using basic authentication for SMTP instead of Oauth, which by default is blocked by the security defaults in Azure.

Please refer to this link to disable Azure security defaults and see if it can help with this issue:

Disabling security defaults

If the issue persists, please refer to this link to check other possible causes like conditional access policy:

Error: Authentication unsuccessful

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