Using this guide, you can easily update your ATT.net email settings.
It's as simple as selecting a file to adjust your account settings.
Your AT&T email address can be altered by tapping the account.
Make sure your IMAP and POP email settings are correct.
Then, enter the user's full name.
Enter your secure mail key in the password field if you want to remember your password.
You will be prompted to test your account settings after clicking next.
After you have finished the application, close it.