I was having issues with password apps again. I cleared all password apps from my outlook account, and generated a new one and entered it into Thunderbird. Now things are working as desired. I may have had more than 40 app passwords, and that was cre...
Had troubles with Thunderbird Nebula. I deleted all SMTP settings. And then, sending emails worked fine for me. Went to Tools> Account settings > SMTP Settings (bottom of accounts), and then deleted all SMTP accounts associated with a hotmail/outlook...