Hi there and welcome
ATT mail is now done by Yahoo, so you will have to use this for your emailing from now on.
They made this change a few years ago as it is more cost effective to allow Yahoo with its large email infrastructure to manage their email system.
So to sign into your ATT email account, you sign in via
And click Sign in at the top right
If you have any problems, or would like any additional information or assistance, please do not hesitate to let me know.
Else if you can take a second to rate my service by clicking one of the stars at the top of the screen then submit, that would be greatly appreciated.