To stop receiving emails, go to your profile. Select the contact information tab. Click on the email address and select manage. Select the ‘delete account’ option for confirmation purposes.
How do I delete my AT&T email account?
You have to go to your profile -> contact -> email tab and click on the manage button. Then you select the delete account button. After that you need to type your member ID or name. You can confirm it like it was disabled from here.