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From: Jesper Harder <harder@myrealbox.com>
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Subject: Re: gnus-alter-header-function and mail->news gateway.
Date: Fri, 07 Mar 2003 02:24:22 +0100
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Gaute B Strokkenes <gs234@cam.ac.uk> writes:

> I read a mailing list through a news gateway.  Threading does not work
> very well, since the gateway munges the headers slightly.  For
> instance, "References:" becomes "X-Originial-References:".  I would
> like to have Gnus consider this information as well, and it seems that
> I can do so using gnus-alter-header-function.

This function won't do the trick -- it can only alter a header _value_
not the name of a header.

Another more serious problem is that Gnus doesn't know the the value of
'X-Originial-References' when the threading is done.  

Initially, just the subset of headers included in the overview are
fetched.  The rest of the headers are only fetched from the server when
you actually view the article.

You _can_ tell Gnus to fetch all headers, but this will be _much_ slower
than the normal method.

Something like this might work:

(defun my-unmangle-references ()
  (save-excursion
    (goto-char (point-min))
    (when (re-search-forward "^X-Original-References:" nil t)
      (replace-match "References:"))))

(add-hook 'gnus-parse-headers-hook 'my-unmangle-references)
(setq nntp-server-xover nil)