I did a battery pull and it still is not working so i changed it back and now im not receiving emails on that one either
A communication error has happened between the bbserver and your email server. All you need to do is login and re-validate your email passwords.
You can do this on your phone under email settings, or go to the actual blackberry email site and update there. Here is the link, scroll down and select your service provider and sign in, and update the password.
If you need don't remember your login info, you might have to call tech support to have them give you your login infor, or reset your password. There is an option to send the pword to your pin, but you must know your login name.