Instead, it is a guide to using it politely, effectively, and efficiently. Most people on MAIL will know you only by what you say and how well you say it. They may someday be your co-workers or friends. Take some time to make sure each posting is something that will not embarrass you later. 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.