If you are encountering issues while receiving or forwarding an email on your ATT then sign out your account and later again sign in your ATT account and then try to resend an email. If after doing this you are unable to receive or send emails then Contact att customer service phone number by calling or messaging at 1-833-276-4777.The Customer Support team will definitely resolve your query faster and will also provide a reliable service. https://attcustomerservicephonenumber.com/