February 18, 2012 at 12:10 pmMy OS is windows 7, and I have tried both segnttis mentioned here. However they have not worked. I even tried pop.mail.yahoo.com and smtp.mail.yahoo.com since I found this suggestion somewhere on the Internet. But it did not work either. I tried to set it up through a different ISP, wireless and wired connections. I still can not get Outlook 2010 to access the AT&T's smtp server. I can receive emails, but can not send. Any other suggestions?