POP3 and IMAP Email Settings - Email Customer Support
https://www.att.com/support/article/email-support/KM101052314.12.2021 · Be sure to use the right server and port settings. These settings are good for email addresses with any of these domains: @ameritech.net, @att.net, @bellsouth.net, @currently.com, @flash.net, @nvbell.net, @pacbell.net, @prodigy.net, @sbcglobal.net, @snet.net, @swbell.net, or @wans.net. Learn how to set up your email program. Avoid email hiccups