When communicating on the Internet, it is essential to observe certain rules of behavior. Actually, netiquette refers to rules of behavior governing the use of all Internet services, including communicating with discussion groups, creation of web pages, and connecting to FTP and Telnet sites. Think before you post a message. Always make sure you really want to send what you have written. E-mail messages are not secure.
Most organizations archive all e-mail messages that pass through their servers.
Messages may also be intercepted en route. Don't use e-mail when you are emotional. 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.