Problem logging in on AT&T. This worked for me!
This is not actually a question but rather a comment to help other people who may have had the same problem as me with logging in to Thunderbird and using AT&T. You know that you need a "secure email key" as they call it for your password with AT&T. Well I already had one but still couldn't login. I found the answer online finally. Just get a NEW secure email key from AT&T and use that as your password.
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Thanks! Locking this thread.