Sending mail to a large mailing list or forwarding chain letters wastes valuable computer resources. For example, when you send a message to an entire class, the computer must create, store and deliver 300 or more separate copies of that message, which can slow it down and prevent other important mail from getting through quickly. Also, some people get very annoyed when they get mail they are not interested in, especially from people they do not know well. If you don't know the person you're sending a message to, or are not sure that they would be interested in the information you're sending, then you shouldn't be sending it. Although we have consciously not made an exact definition of a mass mailing in terms of the number of recipients or the nature of the message, you should use this guideline in determining whether a mailing is appropriate.
Tone is difficult to discern in electronic communication.
Add smiley faces when you are joking or teasing to be sure your mail will not be misinterpreted. Using all uppercase letters makes it appear as if you are shouting, so try to avoid it. Always sign your name to your electronic communication. You should never send mail that appears to be from another user, even as a joke. Electronic mail is the sender's intellectual property.