I'm looking for a script that can append text files - specifically Yahoo! Groups mbox (example below).

I'd like to append them so that a link to the original Yahoo! Group message (found towards the bottom of the header - for example, X-Yahoo-Message-Num: 15306) is printed above the text in the body of the email. For example:

Yahoo-Message-Num: <A HREF="yahoogroup">15306</a>

Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam etc....

===== sample mbox ====

From user_email@... Thu Dec 04 11:28:47 2003
Return-Path: <user_email@...>
X-Sender: user_email@...
X-Apparently-To: GroupName@yahoogroups.com
Received: (qmail 5935 invoked from network); 4 Dec 2003 19:28:46 -0000
Received: from unknown (xx.xxx.xx.xxx)
  by m19.grp.scd.yahoo.com with QMQP; 4 Dec 2003 19:28:46 -0000
Received: from unknown (HELO mail2.accpac.com) (xx.xxx.xx.xxx)
  by mta2.grp.scd.yahoo.com with SMTP; 4 Dec 2003 19:28:46 -0000
Received: by mail2.accpac.com with Internet Mail Service (x.x.xxxx.xx)
  id <YB41MB87>; Thu, 4 Dec 2003 11:28:45 -0800
Message-ID: <F90AE1685A4C684796A39180FE3B20EB028B479F@...>
To: GroupName@yahoogroups.com
Subject: Message Subject Here
Date: Thu, 4 Dec 2003 11:28:43 -0800 
MIME-Version: 1.0
X-Mailer: Internet Mail Service (x.x.xxxx.xx)
Content-Type: text/plain
X-eGroups-Remote-IP: xx.xxx.xx.xxx
X-eGroups-From: "User, Name" <user_email@...>
From: "User, Name" <user_email@...>
X-Yahoo-Group-Post: member; u=xxxxxxx
X-Yahoo-Profile: user_email
X-Yahoo-Message-Num: 15306

Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonu
+my eirmod tempor invidunt ut labore et dolore magna aliquyam erat, se
+d diam voluptua. At vero eos et accusam et justo duo dolores et ea re
+bum. Stet clita kasd gubergren, no sea takimata sanctus est Lorem ips
+um dolor sit amet. Lorem ipsum dolor sit amet, consetetur sadipscing 
+elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore mag
+na aliquyam erat, sed diam voluptua. At vero eos et accusam et justo 
+duo dolores et ea rebum. Stet clita kasd gubergren, no sea takimata s
+anctus est Lorem ipsum dolor sit amet. Lorem ipsum dolor sit amet, co
+nsetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut 
+labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos 
+et accusam et justo duo dolores et ea rebum. Stet clita kasd gubergre
+n, no sea takimata sanctus est Lorem ipsum dolor sit amet.
[download]

Anybody have a script that can do this, or can point me in a direction to go about making one?

Many thanks in advance,