Interpreting (spam) headers

I'm getting a lot a spam recently, to the point where I've set up my email client (MS Out-of-luck 2002) to bin anything not from a named contact. Tho' I still have to check the trash bin in case any job agencies email me :-(     Anyway, I'm trying to work out what this spam email header is telling me about the sender:

Return-Path: <deborahsevalho@brookshoughton.com>
X-Original-To: ME@dsl.pipex.com
X-Envelope-To: ME@dsl.pipex.com
Delivered-To: ME@dsl.pipex.com
Received: from national.systems.pipex.net (national.systems.pipex.net [62.241.163.9])
      by addams.systems.pipex.net (Postfix) with ESMTP id 6233CE0000D3;
      Mon, 20 Nov 2006 01:56:11 +0000 (GMT)
Received: from 201-67-10-227.bsace704.dsl.brasiltelecom.net.br (unknown [201.67.10.227])
      by national.systems.pipex.net (Postfix) with ESMTP id 93316E0000C8;
      Mon, 20 Nov 2006 01:56:10 +0000 (GMT)
Received: from 216.82.249.179 (HELO cluster6.us.messagelabs.com)
     by dsl.pipex.com with esmtp (*3P2I+(* -)-0)
     id *<WN7I-5/+:/>-06
     for NOT.ME@dsl.pipex.com; Mon, 20 Nov 2006 02:02:40 +0180
From: "Lucas Simons" <deborahsevalho@brookshoughton.com>
To: <NOT.ME@dsl.pipex.com>
Subject: it me Lucas
Date: Mon, 20 Nov 2006 02:02:40 +0180
Message-ID: <01c70c47$f5769870$6c822ecf@deborahsevalho>
MIME-Version: 1.0
Content-Type: text/plain;
      charset="us-ascii"
Content-Transfer-Encoding: 7bit
X-Priority: 3 (Normal)
X-MSMail-Priority: Normal
X-Mailer: Microsoft Office Outlook, Build 11.0.6353
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2670
Thread-Index: Aca6QGVBAB/,J4(H4F(+59@*U9?3,R==


My main question here is why I ("ME@dsl.pipex.com") received this mail when it appears to have been sent to someone else ("NOT.ME" in the "for" field);  I suspected my ISP was redirecting misaddressed emails, but they tell me it's because the spammer is using BCC to hide the list of recipients.  Is my ISP correct?

Furthermore, is there any reliable info in the header, or can it all be forged? So is there any point in me complaining to brasiltelecom ? Or brookshoughton? (If the domain isn't faked, I'm guessing it's part of a botnet or open relay).

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