I say 102 because my real guide for emailing comes from Bill Jensen's book : The Simplicity Survival Handbook: 32 Ways to Do Less and Accomplish More
However Guy's effective emailer is a great refresher.
Let the Good Times Roll--by Guy Kawasaki: The Effective Emailer
1. Yes, I'm often guilty of #5 either by "fisking" or by sending back one line responses. But I'm working at it. My #1 frustration is dealing with those who do it as well so at least I can appreciate it.
As Guy says "Take my advice and do as I say, not as I have done--or will do. :-)"