Comcast Error

[Nic]

When sending a new message in comcast it always goes to my outbox. I then have to send/receive to actually send the message. This is fine but now when trying to send the message from out box I get this message:

"Messages cannot be downloaded to your mobile device. Make sure that you are connected and that your email account settings are correct. Then try again."

I double checked all my settings. Any ideas? Thanks.