https://intercom.help/customer-support-fa9f61f64bea/en/articles/10807479-how-can-you-tell-if-an-at-t-email-is-real
https://intercom.help/customer-support-fa9f61f64bea/en/articles/10807479-how-can-you-tell-if-an-at-t-email-is-real