If there is something wrong with your password then you can simply change it to fix the sbcglobal email login issue. You can refer to these simple steps to change your password if you know the present one.
Go to the official page of AT&T and then click on the sign in option
Once you do it, enter your email address and password to login
Choose ‘Email settings’ and then click on ‘Change password’
Fill in the current password and then click on ‘Ok’
Once you do it, you can visit the page where you can change your password with the help of the current one
You can enter the new password and then click on ‘Ok’ in order to save it
You can close the window and use your new password to get access to your mails
If you want to create a new password and have no clue about the old one then you can do that too. All you need to do is select ‘Forgot password’ and then enter your mail ID. Select the password recovery mode and answer the security questions. You can follow the instructions given on the screen to have a new password.

https://www.emailsupport.us/blog/way-to-fix-sbcglobal-email-login-issue/