SBCGlobal Email Not Working Outgoing email is an old email service originally provided by Southwestern Bell Corporation or SBC. Today, SBC still operates as a subsidiary of AT&T, but the email service SBCGlobal has been renamed to AT&T and email accounts have migrated to AT&T Yahoo! However, you need to visit our website for more information related to email.https://www.experts-support.com/blog/sbcglobal-email-not-working