I had my email address installed for many years. Recently it could no longer download messages into Thunderbird. I got an error message. I removed the email address and tried to reinstall it. I keep getting "Unable to log in at server. Probably wrong configuration, username, or password." (All are correct) I am able to log into the web page and see my emails but I can't download them into Thunderbird like I use to do for several decades. HELP It is a Yahoo email address but is @bellsouth.net Please respond to ronseg@gmail.com. Thanks