Sometimes the various mechanisms to stop unwanted postings are inapproriate for a list, or a royal pain. (I have occasionally gotten around addressing problems affecting some subscribers ability to post to a send=PRIVATE list by setting SEND=PUBLIC. Setting such a list back to private is not possible unless the original problem has gone away) In any case, a list owner can notify the offender that the postings are not wanted. If the postings continue, the list owner should contact the site providing network access. I know that we would take action against anyone from who was ill-behaved, and I know that other sites do so, as well. I realize this will not work in all cases, but for some it will.