Not sure why you would want or need email whilst driving. I use rSAP and it cuts off the network connection to the phone, but as soon as I stop and turn off the ignition, the connection reverts to the phone and all my emails that have been waiting in the ether arrive at once. Using email or internet features on a phone whilst driving is dangerous.
However, I suppose if you spend most of your day parked on the NCP M25 then you can do a whole day's work on the way to and from the office...
