https://support.revvitysignals.com/hc/en-us/community/posts/35898494868116-How-can-you-tell-if-an-at-t-email-is-real
https://support.revvitysignals.com/hc/en-us/community/posts/35898494868116-How-can-you-tell-if-an-at-t-email-is-real