Keep messages as brief as possible. Do not shout. This is done by typing the subject line and message using all capital letters. Avoid expressing a strong criticism of someone or something. This is known as flaming on the Internet.
Most mailing lists desire postings that are professional in nature.
Humor in good taste is usually allowed. Avoid profanity in your postings. There is a mailing list you may want to subscribe to that announces new Internet discussion groups. This mailing list is called The Scout Report. The Scout Report is published weekly by InterNIC Information Services.