Resist taking a difference of opinion personally. Someone not liking your position or the nutty thing you have done does not mean that they dislike you. Never engage in a flame war, roughly defined as a heated exchange that deteriorates into personal attacks. Have your flame-proof vests ready at all times. The Internet facilitates the rapid exchange of vast numbers of messages.
Many people subscribe to multiple lists.
As a general rule, do not forward material from other lists. Particularly do not forward jokes, as these make the rounds quickly and tend to get recycled periodically. If you discover a related list that subscribers may be interested in, provide subscribing information so that people can decide for themselves whether to join. Try to keep your personal list total to under 5. If you belong to a list that has more than 50 messages per day, resign from your job and take up list reading full-time.