I have some small quibbles with this. I would be very irritated by #4, the meaningless nicety. I have to process 50 or more e-mail a day—don’t waste my time reading B.S. I can also skip the greeting (though I agree that “Hey!” is offensive). Start with #6, then #5. Keep the email short and to the point.

#7, #8, and #9 are good.