E-mail question regarding address and SPAM

Ok so I go to bed and when I get up I have **x14 **SPAM mails in my inbox for my ISP account.
This an account that is not used, other than to recieve the monthy bill.

Below is the info from one of the messages, however the TO: is not me, so why is it comming to my inbox ?

Return-Path: <[email protected]>
Received: by cpms01.int.iprimus.net.au (
id 455D01E400A29842; Thu, 23 Nov 2006 05:27:39 +1100
Received: from mx04.syd.iprimus.net.au ( by mx03spool.syd.iprimus.net.au (7.3.116)
id 44F9FBA005C3883F; Thu, 23 Nov 2006 05:27:40 +1100
Received: from lns-bzn-43-82-249-177-131.adsl.proxad.net (HELO ROUIT) ([])
by mx04.syd.iprimus.net.au with ESMTP; 23 Nov 2006 05:19:58 +1100
Received: from (HELO brain-adv.com)
by iprimus.com.au with esmtp (R9H06.59 0664T)
id /[email protected]@Y7-6X
for [COLOR=Blue][email protected][/COLOR]; Wed, 22 Nov 2006 18:19:59 -0060
From: “Earle Wynn” <[email protected]>
To: [COLOR=Blue]<[email protected]>[/COLOR]
Subject: Earle wrote:
Date: Wed, 22 Nov 2006 18:19:59 -0060
Message-ID: <[email protected]>
MIME-Version: 1.0
Content-Type: text/plain;
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 V6.00.2800.1506
Thread-Index: Aca6QWJ(QA1,X/:[email protected]’P3K==

There were x6 to that address.

To: <[email protected]> x1

To: <[email protected]> x1

I was under the impression that the to: should be to me. Am I wrong about this, can anyone comment on why x8 of the x14 e-mails are not addressed to me ?