The message body is a list of "official" newsgroups and their description, one group per line. They are compared against the list of active newsgroups on the current host. The names of any obsolete or new newsgroups are mailed to the user usenet and descriptions of the new newsgroups are added to the help file used when posting news.
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