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These settings work for all AT&T-affiliated domains, including: @sbcglobal.net , @bellsouth.net , @ameritech.net . @pacbell.net , @swbell.net , @prodigy.net , @flash.net . POP3 and IMAP Email Settings - AT&T Email Customer Support
Ensure the box for "My outgoing server (SMTP) requires authentication" is checked.
Always ensure "Use SSL" or "SSL/TLS" is checked for both incoming and outgoing servers.
AT&T strongly recommends using over POP3 because it synchronizes your email actions (like reading or deleting) across all your devices. IMAP (Recommended) POP3 (Traditional) Incoming Server imap.mail.att.net inbound.att.net Incoming Port 993 (SSL/TLS) 995 (SSL/TLS) Outgoing Server smtp.mail.att.net outbound.att.net Outgoing Port 465 or 587 (SSL/TLS) 465 (SSL/TLS) Username Your full email address Your full email address Password Secure Mail Key Secure Mail Key The "Secure Mail Key" Requirement