How to Set Up AT&T Email
To set up your email account on macOS or Windows, first download and install the Postbox desktop email app. Next, from the File menu select New > Mail Account, then enter the email settings outlined below.
Email Settings for AT&T
Important: You'll need a Secure Mail Key from AT&T.
Incoming Server – IMAP
Server: imap.mail.att.net
Port: 993
Security: SSL/TLS
Username: Your full email address
Password: Your password
Outgoing Server – SMTP
Server: smtp.mail.att.net
Port: 465
Security: SSL/TLS
Username: Your full email address
Password: Your password
