[Mailman-Users] Spam - How is this happening?

[Jewel]

I run a Mailman server and have noticed more recently that it seems spam 
is being posted to some lists but when I look at the headers the message 
was only posted to the mailman-owner or the owner of the list.  How is 
this happening?  Here is an example of a header.  From just looking at 
the message it looks like it was posted to the entire list but in 
reality it looks like the address was spoofed?  Please help.

Subject:
Every day you loose the sensations of seex!
From:
Meadows <addendumapartheid at rousselpartners.com>
Date:
Fri, 20 Oct 2006 23:53:27 +0900

To:
lawdeans-l at lists.washlaw.edu

Return-path:
<mailman-bounces at lists.washlaw.edu>
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Sender:
mailman-bounces at lists.washlaw.edu
Errors-to:
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Message-ID:
<09183786730436.BB2B64E214 at S6JVCR>
MIME-Version:
1.0
X-MIMEOLE:
Produced By Microsoft MimeOLE V6.00.2800.1106
X-Mailer:
Microsoft Office Outlook, Build 11.0.5510
Content-type:
text/plain; charset=Windows-1252
Content-transfer-encoding:
7bit
Delivered-to:
lawdeans-l-owner at lists.washlaw.edu
Thread-index:
4X3l7WDm9uyWcpAu08vLj8uQqjrHbllRFCVl
X-ASG-Debug-ID:
1161356034-0a76001f0000-YLUhBN
X-Barracuda-URL:
http://mxgateway.washburn.edu:7777/cgi-bin/mark.cgi
X-Barracuda-Connect:
lists.washlaw.edu[198.252.9.198]
X-Barracuda-Start-Time:
1161356034
X-ASG-Whitelist:
Sender
X-Original-To:
lawdeans-l-owner at lists.washlaw.edu
X-ASG-Orig-Subj:
Every day you loose the sensations of seex!
X-Barracuda-Virus-Scanned:
by WU E-mail Filter at washburn.edu
X-Barracuda-Spam-Score:
0.00
X-Barracuda-Spam-Status:
No, SCORE=0.00 using global scores of TAG_LEVEL=2.4 QUARANTINE_LEVEL=4.0 
KILL_LEVEL=6.0
Original-recipient:
rfc822;mark.folmsbee at washburn.edu



Thanks!

-- 
J