We try to teach them to use them responsibly. We have online discussions. The teach poses a question and each of the students respond in writing. We do this with web based discussion, but it will work well via email. We try to heavily stress that what occurs in email is the same as what occurs in real life.
Students often feel that anything on the computer is a game.
We try to wean them from this incorrect notion. Students will send anonymous email. We don't let them do this. This is bad. You can image the problems.