Bulli: as said the PMs will stay in your outbox till they are read by the recipient.... kind of like a read reciept. 8)
Marcher: can you check your registered email and that it isn't blocking the board emails as spam? change the email and see if it works, also check your UCP (user control panel) to make sure you have it set to receive board emails in the setting and try and subscribe to a thread to test it?
hopes this helps