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From: Jesper Harder <harder@ifa.au.dk>
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Subject: Re: Can thread gathering use In-Reply-To: <message-id>?
Date: Wed, 15 May 2002 20:53:43 +0200
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tkoelman@xs4all.nl (Tom Koelman) writes:

> On inspection of the reply I noticed that it didn't have its
> References header set, but did have a header called In-Reply_To: with
> the correct message-id.
>
> Is there some way to make gnus use this information?

Hmm, I would have thought Gnus already does it.  This piece of code from
`gnus-nov-parse-line' seems to do exactly that:

    (when (and (string= references "")
	       (setq in-reply-to (mail-header-extra header))
	       (setq in-reply-to (cdr (assq 'In-Reply-To in-reply-to))))
      (mail-header-set-references
       header (gnus-extract-message-id-from-in-reply-to in-reply-to)))

You could try do edebug `gnus-nov-parse-line' to find out, if it really
works.