I would start with a battery pull.
1st step to take if device is having problems? - BlackBerryFAQ
If that doesn't work, I would try resending your service books:
How do I resend my service books? - BlackBerryFAQ
If that doesn't work, I would check the settings.
Messages > Options > General Options > Hide Sent Messages = ??
Messages > Options > Email Settings > Send Email To Handheld = ??
Messages > Options > Email Settings > Save Copy In Sent Folder = ??