I'm connected to a friend's Wi-Fi and have been unable to send emails. I get error message saying "Sender rejected by server". My IPAD2 is brand new and I haven't tried sending emails from my own home yet. I've tried the "reboot" solution and that did not work. Are there any other things I can try? This is really frustrating. BTW, I have Comcast and Gmail both set up on my IPAD with Comcast as the "default". I've double checked my settings and they are all OK. Help!