[RaceBannon]

att, it uses a yahoo server

pop.att.yahoo.com
smtp.att.yahoo.com

the ports are the same 946 and 442 or somethign like that

ssl

I always had to use my full address with @att.net

[50cal Smokepole]

I switched to att recently and have had that problem. I have the internets, just no email. Take a closer look at that error message. Look for “server error...”
Try restarting your email app. If that doesn't work, reboot (I had to do that once, don't know why, prolly some security hangup.)