The my.att.net home page has been replaced. The new homepage for all AT&T Internet Service customers is
http://www.att.net
Upgraded customers should sign-in directly at att.net to visit the home page and access webmail.
If your account has not been upgraded, you can still access my.att.net webmail at http://webmail.att.net.
For more information on the att.net upgrade and transition - click here.