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I do know that ATT uverse email addresses are supported because they are powerred by yahoo, but as far as forwarding, i dont belive that to be an option. ATT uverse internet and internet based tv is pretty awesome, but only cause verizon fios is not offered where i live
Another interesting feature you might be able to partake in is the ATT Uverse WiFi access. in my neighborbhood if you have ATT for internet you can contact them for the access info and utilize the WiFi anywhere you are.