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Also known as: User-Agent
The header naming the software that posted an article, giving a client name and version. It displaced the older X-Newsreader and X-Mailer headers in common practice. The value is informational and freely settable, so it identifies posting tools only loosely, but it helps administrators spot automated bulk posters and helps diagnose clients that mangle threading, character sets, or encoding in recognizable ways.
Browse all terms in Core Usenet Concepts, or see the full Usenet glossary.