Here is what a redirected catchall email sent to anyone@mysite.com looks like with a quick hack to grab the last for (original) target (2) and the To: field (3) - the (n) are added for clarity. There are some mail Parsers on CPAN that you should look at but as you will have to do the guestimations by hand this may just do. You could use something like String::Approx to automatically guess the best address.

my $message = join'',<DATA>;
my ( $for, $to ) = $message =~ m/.*for\s+<([^>]+)>.*\nTo:\s+([^\n]+)/s
+;
print $for, $/, $to;

__DATA__
Return-Path: <jfreeman@tassie.net.au>
Received: from zeus.tassie.net.au (zeus.tassie.net.au [203.57.213.21])
        by perseus.tassie.net.au (8.12.2/8.12.2/RG2.2) with ESMTP id g
+3IB9LuQ085226
        for <jfreeman@tassie.net.au>; Thu, 18 Apr 2002 21:09:21 +1000 
+(EST)
Received: from perseus.tassie.net.au (perseus.tassie.net.au [203.57.21
+3.25])
        by zeus.tassie.net.au (8.8.8/8.8.8) with ESMTP id VAA16087
        for <anyone@mysite.com(1)>; Thu, 18 Apr 2002 21:10:26 +1000 (E
+ST)
Received: from tassie.net.au (dialin67.hbt.tassie.net.au [203.57.210.6
+7])
        by perseus.tassie.net.au (8.12.2/8.12.2/RG2.2) with ESMTP id g
+3IB9KuQ085223
        for <anyone@mysite.com(2)>; Thu, 18 Apr 2002 21:09:20 +1000 (E
+ST)
Message-ID: <3CBEAB8D.A7CD69BC@tassie.net.au>
Date: Thu, 18 Apr 2002 21:18:37 +1000
From: James freeman <jfreeman@tassie.net.au>
Organization: Adajio
X-Mailer: Mozilla 4.7 [en] (Win98; I)
X-Accept-Language: en,pdf
MIME-Version: 1.0
To: anyone@mysite.com (3)
Subject: redirect
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
X-Mozilla-Status: 8001
X-Mozilla-Status2: 00000000
X-UIDL: lL`"!A@*!!#/'#!RO3"!

This message will get redirected to catchall because 
anyone is not a valid account at mysite.com
[download]

cheers

tachyon

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