Download the module to manage Exchange Online more securely.), then Install this module on affected computer (module's name: .Client.application)ģ. Download the second Configuration ( The Exchange Online PowerShell Module supports multi-factor authentication. to expand left menu > Under Admin centers go to Exchange > then click on hybrid.Ģ. Go to your O365 Admin panel > click Show all. Thanks to Microsoft's O365 Ambassador Mr. I have already tried all suggestions I could find (deleting passwords, resetting all, restarting, deleting and adding account again, changes in Config editor related to security.tls), but nothing worked for me.Īny advise is very welcome. Sometimes, at some moment after click on Cancel, it said 'Message sent' and I can see it in my Sent Items folder, but it's fake because I never receive that test message to my personal Gmail address. I've tried all variations available, but nothing works.

If 'Cancel', then receiving message with 'unknown error 80004005' and all other blablabla about unknown reasons, with instruction to check my SMTP settings. Click on 'Retry' or 'Enter new password' do nothing, just return the same pop up. The first thing that jump out is that my password is not OK, which is not correct. OAuth (this is correct setting, all others shows errors, including &, which is completely normal since I'm not in China). IMAP works just fine, all folders synced regularly, but sending not work for some unknown reason. I was connected to O365 with my work email but cannot send any message.

Thunderbird office 365 smtp