Since few day, after my Big Sur upgrade, I can't sent any emails with Microsoft Outlook.
Receiving works well, my Outlook is up-to-date (16.43) and the most important topic, Mail have no problems to sent mails via SMTP yet.
Ticket to Microsoft is opened.
MacBook Pro with Touch Bar
Hi dear,
I got the same problem and tried different settings of my mail client ... without success.
Then I've done the following:
Open Keychain Access Utility
Click Keychain Access in top left corner
Click Preferences > Reset Default Keychain.
Confirm (several times)
Restart your Mac
Re-enter all your passwords
Test ---> it should work by now !
Gary
My provider have changed the port, and Apple Mail used the right port automatically.
Can't send any emails in MS Outlook since upgrade Big Sur
