The AT&T is currently down and the AT&T webmail as the company official website. It started by 5:00 A.M./P.S.T. and 8:00 A.M./E.S.T. As you attempt to login in AT&T web login page, the site returns a "Cannot find server" message from your browsers.
To read more about this issue, you can open U.S. News Today web post for more. [Connect from here]