It sounds like you whatever email service you received that email on doesn't have a service book present for which to send a reply. it happens, oddly as it sounds.
Look at the top of one of those odd emails and see what it says "received using...?" what is there?
Pull your battery, reboot and try it again. If still nothing, resend your service books. How do I resend my service books? - BlackBerryFAQ