Feb 05 2023 12:57 PM
Authenticating with XOAUTH is suddenly failing with 535 5.7.3 Authentication unsuccessful for smtp.office365.com for personal accounts (Outlook/Hotmail/Live). It started with a few accounts, but it seems more, and more people are suffering from this.
To be clear: authentication worked fine before for the same account. It just stopped working, with the same OAuth refresh token, but only for the SMTP server, not for the IMAP server. Authenticating with an (app) password for the same account is a workaround for this issue, so it is probably not an account status problem.
Normally "535 5.7.3 Authentication unsuccessful" means that SMTP AUTH is disabled, but this is not possible for personal accounts, as far as I know.
Examples:
https://contact.faircode.eu/?product=fairemailsupport
https://www.aqua-mail.com/forum/index.php?action=recent
Can somebody please look into this, or contact an engineer at Microsoft?
Feb 05 2023 01:30 PM
Hi please this is a helpful discussion below, but MTC is not technical support, so you need to contact Microsoft support directly.
535: 5.7.3 Authentication unsuccessful - Microsoft Community
Feb 05 2023 01:33 PM - edited Feb 05 2023 01:40 PM
@A1 Thanks, but that's about Office 365 accounts with SMTP AUTH disabled, but this issue is about personal accounts (Outlook/Hotmail/Live).
So, it is not the same issue.
Moreover, this problem does not occur for Office 365 accounts in the same setting.
Feb 05 2023 01:48 PM
"535 5.7.3 Authentication unsuccessful for smtp.office365.com for personal accounts"
This is a common error and sometimes it is worth reading the shared thread in its entirety
Best regards
Feb 05 2023 01:52 PM
@A1 I did my research before posting here. Believe me, those articles won't help to solve this problem. Quite some people using multiple apps are suffering from this, and all of a sudden. Therefore, this is likely a problem at the side of Microsoft, again, unfortunately.
Feb 05 2023 02:03 PM - edited Feb 05 2023 02:09 PM
" Therefore, this is likely a problem at the side of Microsoft, again, unfortunately"
I understand, but it is complicated and rather this post - will be another submission.
Enable or disable SMTP AUTH in Exchange Online | Microsoft Learn
Please this is official documentation.
Feb 05 2023 02:05 PM - edited Feb 05 2023 02:06 PM
So, what do you propose to do? Contact Microsoft? If so, how? There doesn't seem to be a support contact for Outlook/Hotmail/Live, so ...
Feb 05 2023 02:26 PM
Microsoft 365 - support
Feb 05 2023 10:31 PM
@A1 This is about personal Outlook/Hotmail/Live accounts, so the Office 365 team won't help.
Feb 05 2023 11:01 PM
Is that how Microsoft support responded?
Feb 05 2023 11:06 PM
Feb 05 2023 11:10 PM
Feb 05 2023 11:27 PM
Check if this app provides proper synchronization - this is the easiest way and almost always works :)
Feb 05 2023 11:30 PM
Feb 05 2023 11:39 PM
This is built in for Windows - install and write!
Feb 05 2023 11:45 PM
Feb 06 2023 01:00 AM
Thank you for the discussion was very informative!
Feb 07 2023 09:27 AM
@A1 I told you so:
"Concerning your service ticket, I wanted to inform you that we support only enterprise accounts since we are Exchange Online break-fix team."
What do you suggest as an alternative?
Feb 07 2023 10:02 AM
Feb 07 2023 10:13 AM