I have a 4S. Paired to BT in my car. I don't use it to play music, just calls. Every time i get an e-mail / other notification in the car, it plays over bluetooth, which then triggers the telephone ...

I find notification centre on the Mac annoying. So I set it to Do Not Disturb for the entire day, but this has a side effect of turning off email sounds, which is the 1 item I want on. I take it there ...