Are you trying to send from a Blackberry email address to a hotmail address that you have set up on the device as well? Or someone elses hotmail? If the hotmail address is not set up on the device you may want to check your regular web inbox to see if it's arrived there. If it is set up on the device you may want to try a hard reset, pulling the battery out while the device is still powered on, and try to resend it after it's powered back on. You might need to resend the service books via your bb management website, or get in contact with your service provider. A good way to test your emails that are set up on the device is to send an email from the address to the same address, example sending an email to the blackberry account from the blackberry account.