Alright, let’s face it; AT&T certainly complicates email configuration with the variety of SMTP mail servers that they oversee. Whenever a customer calls with a configuration problem and tells me that they are sending through AT&T, I take a deep breath and prepare myself for battle. Some of the SMTP mail servers under the AT&T umbrella include:

• smtp.pacbell.yahoo.com
• smtp.sbcglobal.yahoo.com
• smtp.prodigy.yahoo.com
• smtp.swbell.yahoo.com
• smtp.ameritech.yahoo.com

But, confusion aside…

Here are the settings for the AT&T Yahoo SMTP Mail Server:

SMTP Server Address: smtp.att.yahoo.com
SMTP Port Number (outgoing): 465 w/SSL checked (this will automatically change your incoming POP3 Port to 995)
SMTP Authentication: Yes, select SMTP Authentication (outbound) and use your AT&T Yahoo email address and password

As always, let us know if you are having problems getting GroupMail configured for your AT&T Yahoo or any other outgoing SMTP mail server.