I've been trying to access my e-mail through the standard inbox via wifi.

Everytime I do it, It generates this error:
"Messages cannot be downloaded to your mobile device. Make sure that you are connected and that your e-mail account settings are correct. Then try to download messages again."

I was able to successfully send an e-mail and when type in the wrong username or password it pops up the username screen again. It's obviously connecting. It just won't download the messages

Please help!!!