Forum Discussion
SMTP XOAUTH suddenly failing for Outlook personal with '535 5.7.3 Authentication unsuccessful'
Microsoft 365 - support
Deleted This is about personal Outlook/Hotmail/Live accounts, so the Office 365 team won't help.
- Actually no. I'm currently working on learning MailKit usage in PowerShell, but using EXO/M365/Entra to do this, rather than personal Outlook. I just came across this page as I was earlier having the same 535 5.7.3 Authentication Unsuccessful error. I got past it, and it was unrelated to your original issue's solution. But couldn't help but notice how you were getting actively deflected and want to let you know I could see that and thought it was ridiculous.
JeremyTBradshaw did you see this recent issue?
https://answers.microsoft.com/en-us/outlook_com/forum/all/user-is-authenticated-but-not-connected/7d8465ec-9906-4733-8795-8ff75a527d02
Who does still want to use an Outlook account?
- Wow. You were tortured, and then it was indeed a fix on the backend! Great job persevering! I envy your self-control.
Deleted thanks for the suggestion.
Posted here:
Start a new discussion in the space below, you can add a link to this discussion, of course it does not ensure success, but it is worth checking out!
Security, Compliance, and Identity - Microsoft Community Hub
The same issue is reported here:
https://learn.microsoft.com/en-us/answers/questions/1168272/oauth2-for-smtp-send-granting-accesstoken-but-retu
And here:
https://learn.microsoft.com/en-us/answers/questions/1168242/smtp-send-oauth-permission-not-working-for-consume
I have tried to chat with Microsoft support and they hang up three times with "Do you have any other questions?", which I think is insane.There is just no support for personal/consumer accounts and this is being proven again and again. My advice is not to use an Outlook/Hotmail/Live account for anything significant.
I assure you that this discussion is visible, so we can only wait for Microsoft to prepare a fix.
- There are plenty of people complaining here and at other places:
https://www.aqua-mail.com/forum/index.php?action=recent
The lack of a solution is completely due to Microsoft because they are the only ones who can resolve this. Like I said before, support for personal accounts is non existing. There are a million Members in the MTC - only we discuss, I am a little surprised by the lack of a solution
- That doesn't help if the old EWS protocol (commonly called "Exchange", which is pretty confusing because an Exchange server is not the same as this protocol), isn't supported. Moreover, Microsoft stopped supporting the EWS protocol in 2018 (informally there were no updates since 2016 anymore).
A better workaround, because that is what this is, is to not use Outlook accounts anymore because they are not supported, even not if you can't send messages anymore when using OAuth and an universal email protocol like SMTP.
Moreover, Microsoft is trying to move people away from password authentication, for good reasons, and therefore it is pretty unbelievable that OAuth doesn't work for SMTP anymore, and that nobody cares. When using password authentication it works fine.
If you think that my advice is to stop using Outlook is overdone, no I don't think so. The previous problem, IMAP IDLE (=push messages) not working anymore took Microsoft almost three months to recognize and fix. That's pretty pathetic and unprofessional.
So, this is not about emotions, but about facts. Outlook/Hotmail/Live is unreliable for anything which has any significance. https://answers.microsoft.com/en-us/outlook_com/forum/all/resolved-cant-connect-to-outgoing-server-settings/375f6bd0-f68a-4f94-b444-f58de422a627
Deleted the Office 365 team already said that they do not support personal accounts.
https://learn.microsoft.com/en-us/answers/questions/788460/504-5-7-4-unrecognized-authentication-type-(with-o
In this Microsoft Q&A space, you can ask technical questions - I think there is a chance for an answer that will be helpful.
Deleted this is not related to the issue in any way. Also, this is for Enterprise accounts because you can't change server settings for personal accounts.
https://learn.microsoft.com/en-us/exchange/clients-and-mobile-in-exchange-online/opt-in-exchange-online-endpoint-for-legacy-tls-using-smtp-auth
Now it occurred to me?
- There is no way to contact Microsoft about personal accounts. Try it yourself, and you'll see.
Basically, there is no support for personal accounts. That's what they say too when you contact them in another way.
I tell everybody to not use a personal Outlook account for anything important because it can stop working at any time, and there will be no support at all. In fact, I am considering to hard code this message in my Android app. Please at this point is a link to Microsoft support, I hope that they will develop this problem.
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Still need help?
To get support in Outlook.com, click here or select Outlook.com help icon on the menu bar and enter your query. If the self-help doesn't solve your problem, scroll down to Still need "
Hi Viv_V
Please check this article:
https://support.microsoft.com/en-us/office/sent-email-in-outlook-com-comes-back-delivery-failed-45e048ac-f7b1-4c0f-b525-081cb34f1062
- This is about the SMTP server for Outlook accounts and therefore not related to a specific operating system.
- Do we have any solution so far. We are facing same issue. Suddenly, SMTP OAuth stopped working for personal accounts for last few days. IMAP is working fine. We use limilabs library for IMAP and SMTP. Following exception is being thrown:
Authentication unsuccessful [YT3PR01CA0065.CANPRD01.PROD.OUTLOOK.COM 2023-02-07T18:12:16.786Z 08DB090770EF088C] Deleted 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?
Thank you for the discussion was very informative!
- Please understand that not everybody uses Windows. For example, I do not.
This is built in for Windows - install and write!
