The telephone is a two-way communication system, which allows you to judge the other party's mood and attitudes by their responses and tone of voice. Long documents may be best sent on paper or by fax, especially if they are heavily formatted, or include illustrations. Get to know the software. Misspellings detract from your message, no matter how good your point is. Give messages an accurate, descriptive subject.
Some people get dozens, maybe hundreds of messages a day.
Accurate and concise subject lines help users wade through large amounts of mail quickly.