• First of all, Visit the ATT.com website and tap the Email icon.
• Choose the button Manage my account.
• Then, Enter your user id or email address and password in the given text fields respectively.
• Enter the button of Sign In.

Read more here:- https://assistkeys.com/att-net-email-login/

Also Read:  https://amazefeeds.com/att-email-account-everything-you-need-to-know/