Thunderbird-Hilfeforum

As of version 115.0 for 64bit, I am unable to send emails to Outlook.com. An error occurs saying:

Send Message Error Sending of the message failed. The message could not be sent because the connection to the Outgoing server (SMTP) smtp.office365.com timed out. Try again.

There are no issues sending emails to Outlook.com using a different mail client.

Using IMAP to outlook.office365.com and I've stopped getting new mail. I can send mail but not receive. It just times out after a couple of minutes. Any help is appreciated. Settings match microsoft's server names etc. Steve

I have to use MSN now for my email server since your software no longer works!!! I can't send anything through your software now that you "upgraded" your TB software without my permission. Not sure why, but MSN is now saying that Outlook won't work with TB. So, good luck with that.

I've been a faithful Thunderbird user since the beginning - and continue to use Thunderbird with our company's Microsoft365 deployment

until Monday of this week -- when suddenly I find that my credentials are being refused.

The symptoms

• XXX: Connected to outlook.office365.com
• nothing in the activity viewer
• no email coming in

I've read and tried all the fixes proposed in the article at https://support.mozilla.org/en-US/kb/microsoft-oauth-authentication-and-thunderbird-202 (restarting thunderbird after each step, naturally)

• have authorized Thunderbird to our Microsoft365 tenant
• created and tried registering with a new thunderbird profile
• have set my security settings to 'accept all cookies'
• have used the config editor to remove 'oauth2.issuer' and 'oauth2.scope' values
• I've checked that my account in Microsoft365 has IMAP and Authenticated SMTP enabled

So, since Monday, I've been living in hell, trying to pretend that the Microsoft Outlook app for macOS is useable, but it's practically debilitating to be forced to use that piece of software.

Can somebody please point me to another possible set of steps that I can use to try and diagnose this?

I absolutely hate myself for having to ask for help on this, but I'm at my wit's end...

I have connected my wifes outlook acc. and my Gmail acc. without issue, one on each of the user profiles, but with the 3rd my Outlook acc, I keep getting the "Unable to log in at server..." error. The Name/email/password are all correct. I have tried connecting my 3rd email account (+New/Existing Mail Account) as the 2nd account on different profiles but I get the same error trying to connect my Outlook acc.. I have verified that Thunderbird is configured to accept cookies. Is there some issue with having 2 outlook accounts linked to the same instance of Thunderbird?? (I hope not!! - that would be a complete deal-breaker!) Is there anything else I can try? Many thanks

I have several Outlook.com e-mail addresses in TB 115. Every time I start TB, I get the popup window to send a notification to my Microsoft Authenticator mobile app and authenticate the access. I get the popup for each account I have.

This happened when i installed v115 over the previous version. I still get the authentication popups after deleting my profile and re-entering my accounts from scratch.

All of my outlook.com accounts are passwordless and no longer have an app password associated with them.