Python-smtp connection to send Outlook mail

Question

When running Python code to send an email using SMTP, I keep encountering the following error: SMTPAuthenticationError: (535, b'5.7.3 Authentication unsuccessful [PN0PR01CA0001.INDPRD01.PROD.OUTLOOK.COM 2023-09-14T13:02:12.713Z 08DBB46FC88CCB87]'. I have double-checked that the username and password are correct. What steps should I take to resolve this authentication issue?

Answer 1

Hi @Akash J,

Are you using basic authentication in your code?

If yes, by default SMTP basic authentication is supposed to be disabled in your tenant.

To enable basic authentication, please make sure you have these settings set correctly:

Error: Authentication unsuccessful

Alternatively, if you can use Oauth instead in your code, you do not need to configure these settings to enable SMTP basic auth.

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Answer 2

Hello @Kael Yao

Thank you for the response, and it is clear. I raised this with my admin team, and I think it will now be sorted.