add sbcglobal.net email to att.com for secure mail key
I am trying to generate a secure mail key to access my email, using Thunderbird.
I have an [email scrubbed] email address, but my U--Verse account is under _____.att.com. I have been using the [email scrubbed] email for years. When I login to my U-Verse account, I'm using the ____.att.com userid so the only email account that is displayed as email@example.com which apparently doesn't exist. I had been using inbound.att.com and outbound.att.com as my servers with an IMAP email. How can I add the [email scrubbed] email address to my account? I've tried using OAuth on inbound.att.com, but I get a message that it is not compatible with inbound.att.com. I've tried OAuth on imap.att.yahoo.com, but it doesn't find the firstname.lastname@example.org address.