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Also known as: cancel
A control message asking that one article, named by Message-ID, be deleted from servers carrying it. Nothing in the original design verified the sender, so cancels were trivially forged and were used both to erase other people's posts and, in bulk, to fight spam. Most servers now discard cancels outright or accept them only when a matching Cancel-Lock proves the original poster sent it.
Browse all terms in Core Usenet Concepts, or see the full Usenet glossary.