Do not assume that e-mail is secure or confidential. Others may be able to read your message even over someone's shoulder. Use humor and sarcasm carefully. Written communications suffer from the absence of gestures and facial expressions. Elements of Style Use upper and lower case letters and be careful of your spelling.
Nothing is more distracting than a misspelled e-mail message.
It conveys an attitude of carelessness and lack of thought. Do not type everything in capital letters. That is the equivalent of shouting in e-mail. Keep paragraphs and messages short and to the point. When responding to a message, include that message as a reference point.