The helpdesk is frequently receiving calls regarding the proper settings for sbcglobal.net Outlook settings and att.net Outlook settings. If your email account is still pointing to the pop.sbcglobal.yahoo.com and smtp.sbcglobal.yahoo.com servers, you are likely receiving a certificate warning issue when sending and receiving mail. AT&T changed these severs over a year ago.
sbcglobal.net and att.net Email Servers
Incoming mail server: pop.att.yahoo.com Outgoing mail server: smtp.att.yahoo.com
Mark the checkbox for My outgoing server (SMTP) requires authentication and select use same settings as my incomming mail server.
Server Port Numbers
Incoming server (POP3) – 995 (Check This server requires an encrypted connection (SSL))
Outgoing server (SMTP) – 465 (Change the following type of encrypted connection from None to SSL)