Take the time to delete excessive quotes created by your mail program. Do not post defamatory, libleous or profane items to a mailing list. Do not begin or respond to ad hominum attacks. Subscribers that begin such affairs will be removed from the subscription list without ceremony and those who respond in a similar fashion will be treated in the same manner. There will be no appeal and no forgiveness.
Private communications are exactly that, private.
The deliberate posting of the contents of private messages on a public forum is inexcuseable and will result in immediate and irrevokable banishment from the list. Disputes arrising in private will not be entertained as reason for denying a subscriber access to the list. Debates that move to private e-mail should stay there unless both parties agree otherwise. Do not expect that the subject must rigorously remain solely on the mail list topic. This is a community.