In case you didn’t get your fill from our previous post, the e-mail guide Send — by The Times‘s OpEd editor, David Shipley, and former Hyperion Books editor-in-chief, Will Schwalbe — has a lot to say about e-mail mistakes. If you just made your own e-flub, visit their Web site, Thinkbeforeyousend.com — a collection of the worst e-mail mistakes. You’ll . . .