If you are angry, you can sound abusive or threatening. Be careful when expressing humor and sarcasm because it can be misinterpreted. With most systems you can't get the message back after you click the send button. A large collection of emoticons is available from The Unofficial Smiley Dictionary on the Electronic Freedom Foundation's Extended Guide to the Internet . Use informative, carefully phrased subject headings.
Many people get a hundred or so pieces of e-mail a day.
If you want your message to be read, give your messages concise and informative subject headers. Keep the sentence and paragraph length reasonably short. Some systems break up lines longer than 65 characters. If the note is forwarded, it might be indented by tab. Or messages may be strangely formatted by other mail systems.