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Also known as: msgid, Message ID
The globally unique identifier carried by every article, written in angle brackets as a local part, an at sign, and a domain. Servers deduplicate with it: an article whose Message-ID has already been seen is refused instead of stored twice, which is what keeps a densely peered network from multiplying copies. References threads with it, cancels name their target with it, and NZB files address segments by it.
Browse all terms in Core Usenet Concepts, or see the full Usenet glossary.