has my system been compromised?

[Michael]

I just got an email from a spam blocker. I think my system has been 
compromised. What should I do to fix this?

*email*

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From: Barracuda Spam Firewall <postmaster at smwc.edu>
Message-Id: ulEBk144UO36q.pCiV4rptaEpII at cox.net
Subject: **Message you sent blocked by our bulk email filter**
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Date: Tue, 12 Sep 2006 18:26:10 -0400 (EDT)
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Status: R 
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Your message to: bmichel at smwc.edu
was blocked by our Spam Firewall. The email you sent with the following 
subject has NOT BEEN DELIVERED:

Subject: YOUR MONEY!!! zCzwn1SQSo75n9K1odm82gAt3FSyPNrgE7QHGwF

 
Delivery error report

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        for <bmichel at smwc.edu>; Tue, 12 Sep 2006 18:26:07 -0400 (EDT)
Reply-To: "bmike101 at cox.net" <bmike101 at cox.net>
From: "bmike101 at cox.net" <bmike101 at cox.net>
Date: Thu, 29 Dec 1997 01:09:28 -0300
Message-ID: ulEBk144UO36q.pCiV4rptaEpII at cox.net
To: bmichel at smwc.edu
Content-type: text/html;
 Charset=Windows-1251
Subject: YOUR MONEY!!! zCzwn1SQSo75n9K1odm82gAt3FSyPNrgE7QHGwF
MIME-Version: 1.0