Next, you need to fill in the email address you are using as the recovery email address or secondary contact email address. You must have registered this email address as your backup email address while creating your SBCGlobal or ATT.net email account.
However, if you have even forgotten the recovery email address, or you don’t have its access anymore, you can select the Forgot Contact Email Next, you need to give other information such as your AT&T mobile number, billing Zip Code, or Account number.
After providing the information, select the Continue
And lastly, you’ll receive an email containing your SBCGlobal email or ATT email user ID.