You will need to check with them. AT&T recently merged with Cingular, and have changed.
Because of their massive load, it may be that they have multiple servers, and hence don't publish any specific one.
Here are the
Learn how to troubleshoot when unable to send email with the BlackBerry Server.Thank you for using the AT&T Business YouTube channel. We hope ...
Learn how to configure BlackBerry Enterprise Server Email Filter.Thank you for using the AT&T Business YouTube channel. We hope that this has ...
Learn how to troubleshoot when unable to receive email with the BlackBerry Enterprise Server.Thank you for using the AT&T Business YouTube ...
Learn how to configure the AT&T Centro to sync with your Exchange server with Exchange ActiveSync.
Learn how to configure or setup POP3/IMAP or personal email on the HTC Tilt 2.Thank you for using the AT&T Business YouTube channel. We hope ...
Accessing att.net Mail: Accessing Your Mail From a Web Browser
This means your att.net Mail account is actually a web site on an att.net Mail server. ... A computer dedicated to running such applications is also called a mail server. ...
AT&T Support and Customer Service
AT&T Customers: Get Customer Service, Technical & Customer Support, and Help for AT&T U-verse, Internet, DSL, Home Phone, Satellite TV & Wireless services.
Popular POP and IMAP e-mail providers and their incoming ...
Incoming Servers. Users must contact their e-mail service providers for server addresses ... AT&T WorldNet e-mail may not be accessible from any device e-mail ...
AT&T - AT&T Email
AT&T Email Basics. You can access your AT&T e-mail account using webmail through your web ... With AT&T Webmail you can keep as much as you want on our servers, for as long ...
How do I enable SMTP server authentication? - AT&T Yahoo! ...
Select your AT&T Yahoo! Business Email account and click "Properties. ... Click on the "Servers" tab. Check the box next to "My Server Requires Authentication. ...