To avoid being misinterpreted, try to avoid sly humor. Whether you use your real name or an alias, use a name. It identifies you much better than a simple email address. Use a meaningful subject line when you send email. Use care when addressing mail.
Some groups have a single address and mail goes to all members on the list.
Try not to attach a file larger than 50 kilobytes to an e-mail message. It helps readers display and organize the message. When you are responding to email by quoting parts of a message, leave just enough to indicate what you're responding to. Avoid quoting the entire message. Most email systems will do this automatically.