In the past few weeks I have been unable to login to my att.net account on Thunderbird, even when I re-enter the password. I can get to my gmail accounts without a problem. The att.net account has the bulk of my emails. I attempted to repair the inbox but now cannot see the messages. I also cleared the cache. Prior to being totally unable to receive or send emails from this account, I often had to "retry" when login failed. Now that no longer works and I simply cannot access the att.net (Yahoo) account in Thunderbird but have to do everything in my browser.