not to be all big dick - but at this point in my life I re-read my emails about 1/5 as many times as I used to. when I was younger (including the pre-email days) writing a letter for fax could be an affiar of a few hours, and I always re-read everything 3-5 times. now, I pretty much look over it, unless it is a very important email, and then I will spell check it and send it to my assistant to proof just in case for grammer and spelling I might miss. but I can afford to make the occasional mistakes now, I couldn't then. I strongly suggest continuing to re-read until you are very comfortable with your ability to write business material. if I am sending something to be printed - I'll have two people proof it, though. This. Earlier in my career I couldn't risk sending poorly composed e-mail or notes with errors. Now I look an e-mail over once maybe, time permitting. For critically important or more formal correspondence, my assistant, and if needed, an editor proofreads it.