Client settings need to be updated to Microsoft Exchange. For more info see https://x.co/client

Question

I am using my email and password to send email using python script. But I am not able to send mail since past couple of weeks.
I debugged and found error.

Msg: b"Your message wasn't delivered because your client settings need to be updated to Microsoft Exchange. For more info see https://x.co/client"

on windows machine using outlook I also updated my email to Microsoft Exchange but still my problem is not resolved.
Can someone guide me on this?

Note: From outlook web and app email send/receive both are working fine. problem is only with script smtp.

Answer 1

Is the script using basic auth? Could be its now blocked in your tenant

https://learn.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/deprecation-of-basic-authentication-exchange-online

Answer 2

Hi @prioritybiz ,

Basically, outlook client uses the modern authentication to verily account.
You need to have the permission of O365 administrator. And then go to the Microsoft 365 admin center at https://admin.microsoft.com, go Settings > Org Settings > Modern Authentication. In the Modern authentication flyout that appears, you can enable the basic authentication for account.

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