Paid eMail at att.net has become inaccessible

Please how do I get to my att.net Paid eMail. It became inaccessible ten days ago - apparently when Yaahhoo made a gateway login page inaccessible. I can log in to att.com but I can't get to my eMail. This is personally distressing. I have been a loyal, regular paying customer - small payments admittedly but totalling better that $1000 over the nearly ten years - for a service that Gogoole provides free. I can't understand why I can't be allowed even just to get my Contacts out. I'm not getting mail from my banks, store accounts, personal eMails, people who want to reach me. I subscribed to ATT for my 'phone and internet when I worked in Seattle from 2002 to 2009, and kept the eMail, paying a small fee, when I repatriated to Australia in July 2009. Suddenly, and without warning, it has been shut off. If AT&T want me to go away I will, but they haven't said anything - not that I can figure out how they could, since they are not providing the eMail service I pay for. This is a really bad situation.