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(gnus)To From Newsgroups

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To From Newsgroups
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   In some groups (particularly in archive groups), the `From' header
isn't very interesting, since all the articles there are written by
you.  To display the information in the `To' or `Newsgroups' headers
instead, you need to decide three things: What information to gather;
where to display it; and when to display it.

  1. The reading of extra header information is controlled by the
     `gnus-extra-headers'.  This is a list of header symbols.  For
     instance:

          (setq gnus-extra-headers
                '(To Newsgroups X-Newsreader))

     This will result in Gnus trying to obtain these three headers, and
     storing it in header structures for later easy retrieval.

  2. The value of these extra headers can be accessed via the
     `gnus-extra-header' function.  Here's a format line spec that will
     access the `X-Newsreader' header:

          "%~(form (gnus-extra-header 'X-Newsreader))@"

  3. The `gnus-ignored-from-addresses' variable says when the `%f'
     summary line spec returns the `To', `Newsreader' or `From' header.
     If this regexp matches the contents of the `From' header, the
     value of the `To' or `Newsreader' headers are used instead.


   A related variable is `nnmail-extra-headers', which controls when to
include extra headers when generating overview (NOV) files.  If you
have old overview files, you should regenerate them after changing this
variable.

   You also have to instruct Gnus to display the data by changing the
`%n' spec to the `%f' spec in the `gnus-summary-line-format' variable.

   In summary, you'd typically do something like the following:

     (setq gnus-extra-headers
           '(To Newsgroups))
     (setq nnmail-extra-headers gnus-extra-headers)
     (setq gnus-summary-line-format
           "%U%R%z%I%(%[%4L: %-20,20f%]%) %s\n")
     (setq gnus-ignored-from-addresses
           "Your Name Here")

   Now, this is mostly useful for mail groups, where you have control
over the NOV files that are created.  However, if you can persuade your
nntp admin to add:

     Newsgroups:full

   to the end of her `overview.fmt' file, then you can use that just as
you would the extra headers from the mail groups.