Minimize your spelling errors and make sure that the message is easy to read and understand. Writing is an art and to do it well requires practice. Since much of how people judge you is based on your writing, such time is well spent. If you are upset at something or someone, wait until you have had a chance to calm down and think about it. A cup of coffee or a good night's sleep works wonders on your perspective.
Hasty words create more problems than they solve.
Try not to say anything to others you would not say to them in person in a room full of people. It's generally not a good idea to send mail to someone you don't know or at least have an nodding acquaintance with. When sending mail to an unknown person, it's also possible to reach students, professors, administrators, or professional personnel who may not be excited about receiving your unsolicited message. Avoid Distribution lists Many users know how to use distribution lists to send the same message to a group of people. Please think carefully before doing this.