Be gentle. Newbie here

I've been running Zimbra FOSS since April and love it. Still learning it, but have gotten it working quite well. Even have it running in a VMWare server under Windows XP host. It's been very solid.

So now I'm trying to find out why spam filtering is not working. Nothing gets tagged. I have Kill set to 99% and Tag set to 25%.

Here's a typical header on some very obvious junk:

Return-path:
Envelope-to: info@mydomain.com
Delivery-date: Fri, 22 Aug 2008 16:48:53 -0500
Received: from host-91-103-31-98.customers.adc.am ([91.103.31.98])
by vps.mywebhost.com with esmtp (Exim 4.69)
(envelope-from )
id 1KWeV2-0002f2-L2
for info@mydomain.com ; Fri, 22 Aug 2008 16:48:53 -0500
Message-ID: <000901c904a1$acbd1b50$621f675b@genik>
From: "Camden WRONKA"
To: info@mydomain.com
Subject: Taliban say Nicky Hilton Hotter Than Paris Hilton
Date: Sat, 23 Aug 2008 02:24:39 +04-30
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="--------=_NextPart_000_0005_01C904C7.64B0EF50"
X-Priority: 3
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook Express 6.00.2900.3138
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3198

----------=_NextPart_000_0005_01C904C7.64B0EF50
Content-Type: text/plain;
charset="iso-8859-1"
Content-Transfer-Encoding: quoted-printable

Any clues for me?