I could not get my ATT password to work in Thunderbird. I had to log into my ATT Profile and create a specific Thunderbird password.
I've been a Thunderbird user since its inception. This issue is new and it isn't being disseminated on the web. I could not get my ATT user name and password to work in Thunderbird on 2 of my ATT accounts. In order to fix this issue I had to log into my ATT profile for each account and create a Thunderbird specific password.
New users are probably giving up on Thunderbird because of this.
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Secure mail keys have been recommended here for several months, but yes, it does seem AT&T is lacking when it comes to informing their users. I suspect only a minority access their accounts through email apps like TB, most using webmail.