mailing list and reply-to header

[giglio robbo' d'acciaio]

I'd like to set the reply-to header accordingly to the group I'm in. For
example if I'm in the group “gmane.linux.debian.user.italian” this header
should address to <debian-italian@lists.debian.org> and so on.

I can use posting style to set the header per group and the function
message-fetch-field or message-fetch-reply-field to fetch the value of the
header, but I don't know where to fetch the value from.

For example, theese are the header of this group take from a previous message
of mine.

,----
| Path: news.gmane.org!not-for-mail
| Message-ID: <87hcepfgr9.fsf@father.nostromo.wy>
| From:  giglio robbo' d'acciaio <dgiglio@iol.it>
| Newsgroups: gmane.emacs.gnus.user
| Subject: Refreshing groups
| Date: Sat, 29 Mar 2008 20:54:18 +0100
| Lines: 13
| Approved: news@gmane.org
| NNTP-Posting-Host: lo.gmane.org
| Mime-Version: 1.0
| Content-Type: text/plain; charset=us-ascii
| X-Trace: ger.gmane.org 1206820830 15733 80.91.229.12 (29 Mar 2008 20:00:30 
GMT)
| X-Complaints-To: usenet@ger.gmane.org
| NNTP-Posting-Date: Sat, 29 Mar 2008 20:00:30 +0000 (UTC)
| To: info-gnus-english@gnu.org
| Original-X-From: 
info-gnus-english-bounces+gegu-info-gnus-english=m.gmane.org@gnu.org Sat Mar 29 
21:01:01 2008
| Return-path: 
<info-gnus-english-bounces+gegu-info-gnus-english=m.gmane.org@gnu.org>
| Envelope-to: gegu-info-gnus-english@m.gmane.org
| Original-Received: from lists.gnu.org ([199.232.76.165])
|       by lo.gmane.org with esmtp (Exim 4.50)
|       id 1JfhEY-0003j3-Js
|       for gegu-info-gnus-english@m.gmane.org; Sat, 29 Mar 2008 21:00:58 +0100
| Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org)
|       by lists.gnu.org with esmtp (Exim 4.43)
|       id 1JfhDx-0001Hk-0g
|       for gegu-info-gnus-english@m.gmane.org; Sat, 29 Mar 2008 16:00:21 -0400
| Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43)
|       id 1JfhDu-0001HK-Sn
|       for info-gnus-english@gnu.org; Sat, 29 Mar 2008 16:00:18 -0400
| Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43)
|       id 1JfhDt-0001Gw-Pg
|       for info-gnus-english@gnu.org; Sat, 29 Mar 2008 16:00:18 -0400
| Original-Received: from [199.232.76.173] (helo=monty-python.gnu.org)
|       by lists.gnu.org with esmtp (Exim 4.43) id 1JfhDt-0001Gt-MU
|       for info-gnus-english@gnu.org; Sat, 29 Mar 2008 16:00:17 -0400
| Original-Received: from main.gmane.org ([80.91.229.2] helo=ciao.gmane.org)
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|       (Exim 4.60) (envelope-from <gegu-info-gnus-english@m.gmane.org>)
|       id 1JfhDt-0001MC-6g
|       for info-gnus-english@gnu.org; Sat, 29 Mar 2008 16:00:17 -0400
| Original-Received: from list by ciao.gmane.org with local (Exim 4.43)
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|       for info-gnus-english@gnu.org; Sat, 29 Mar 2008 20:00:10 +0000
| Original-Received: from host221-169-static.75-81-b.business.telecomitalia.it
|       ([81.75.169.221]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian))
|       id 1AlnuQ-0007hv-00
|       for <info-gnus-english@gnu.org>; Sat, 29 Mar 2008 20:00:10 +0000
| Original-Received: from dgiglio by 
host221-169-static.75-81-b.business.telecomitalia.it
|       with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00
|       for <info-gnus-english@gnu.org>; Sat, 29 Mar 2008 20:00:10 +0000
| X-Injected-Via-Gmane: http://gmane.org/
| Original-Lines: 13
| Original-X-Complaints-To: usenet@ger.gmane.org
| X-Gmane-NNTP-Posting-Host: 
host221-169-static.75-81-b.business.telecomitalia.it
| Face: iVBORw0KGgoAAAANSUhEUgAAADAAAAAwBAMAAAClLOS0AAAAMFBMVEUAAAABAQECAgIFBQUL
|       
CwsYGBguLi5QUFBsbGyPj4+wsLDQ0NDr6+vk5OT9/f3y8vJxVnJfAAAAEHRSTlMA/ykhO1tRdaLF
|       
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|       
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|       
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|       
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|       
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|       
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|       
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|       
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|       cHRvcnNfQmFkZ2UucG5nXNoq+QAAAABJRU5ErkJggg==
| User-Agent: Gnus/5.110006 (No Gnus v0.6) Emacs/21.4 (gnu/linux)
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| Original-Sender: 
info-gnus-english-bounces+gegu-info-gnus-english=m.gmane.org@gnu.org
| Errors-To: 
info-gnus-english-bounces+gegu-info-gnus-english=m.gmane.org@gnu.org
| Archived-At: <http://permalink.gmane.org/gmane.emacs.gnus.user/10739>
| Xref: father.nostromo.wy gmane.emacs.gnus.user:56
`----
-- 
      Daniele Giglio      Dona i tuoi cicli di clock alla ricerca!
      email in ROT13      http://boinc.berkeley.edu/
      qtvtyvb@vby.vg
                          --------------------
         "L'uomo e' ancora il piu' straordinario dei computer."
                        -- John F. Kennedy, "Discorso, 21 maggio 1963"