"Proper email is a balance between politeness and succinctness," entrepreneur-investor-author Guy Kawasaki tells Entrepreneur.com. "Less than five sentences is often abrupt and rude, more than five sentences wastes time."
In this way, the email is like poem. A sonnet maybe, with the way its limitations have a funny way of granting freedom. Or maybe an epic poem, given the fact that we all write a novel's worth of email every year. But would a missive by any other length read just as sweet?