usefor-usefor-01 September 2004

3.  News Headers

   The following news headers (also known as header fields) extend the
   fields defined in section 3.6 of [RFC2822] as follows:

   fields          =/ *( newsgroups /
               path /
               injection-date /
               followup-to /
               expires /
               control /
               supersedes /
               distribution /
               summary /
               approved /
               organization /
               xref /
               archive /
               user-agent /
               injection-info )

   Each of these headers may occur at most once in a news article.