I saw where there was a same problem liste a couple of months ago but the solution did nto work. As of this morning I can no longer send with my CompuServe Account. There was no change in my settings, and I have had the account in place with Thunderbird for years. I get an error to enter my password again, I do, then no luck. It asks again. When I cancel, I get an alert, sending of the message failed, Unable to authenticate Outgoing Server (SMTP), please check the password and verify the "Authentication method" in "Account Settings|Outgoing Server (SMTP) I tried change the password authentication from normal to OAuth2. No luck. No problem with downloading messages; they all come through. I saved the message to be sent in my Draft Folder and then when going to the web version of CompuServe (really AOL and really Yahoo), my message is saved in the Draft Folder and I can then send it. Thank you in advance. Sal