The errors in sending and receiving emails via ATT email service can occur anytime as millions of user are accessing this email on a regular basis. The solution to this issue can depend on how complex the problem is. Mostly the issue can be fixed on an individual basis by updating the web browser, clearing the history or using a different web browser for this purpose. The stable net connection also comes at play. But if the situation is too complex, then you can dial the toll-free number at ATT customer care support. The techies available are trained to deal with such issues.