Be sure to properly acknowledge with quotations any material borrowed from others. Be careful of plagiarism. Do not post any messages anonymously. The professional community views this practice as bad form. Be careful when you re-post any requests.
Some requests are fraudulent.
State the subject of your message clearly in the subject line. Before joining mailing lists and news groups give thought to how much time these activities require. Also, for Usenet, look at the news.announce. It contains information to assist you. Remember that not everyone is as polite as you are.