version (no arguments)
The name and version of the software running on the local system is to be mailed back to the author of the message (Reply-to if present, otherwise From).
RFC1036: [Source:"RFC-1036"] [Last Changed:December 1987] [Copyright: 1987 M. Horton, R. Adams]
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Up to RFC1036 3. Control Messages
Optional Header Lines: RFC1036 2.2.6. Control