Received a trojan in email from my own server

Hi,
I received an email with a trojan in the attachment that originated from my own server.
The following is the message header.

How should I address this issue? How can I track who's sending this or wether there is a malicious program on the server?
Return-path: <register@gamenoob.com>
Envelope-to: sales@gamenoob.com
Delivery-date: Sun, 12 Jun 2005 02:21:59 -0700
Received: from [82.14.9.15] (helo=gamenoob.com)
by web.gamenoob.com with esmtp (Exim 4.43)
id 1DhOfa-000224-Qu
for sales@gamenoob.com; Sun, 12 Jun 2005 02:21:59 -0700
From: register@gamenoob.com
To: sales@gamenoob.com
Subject: Email Account Suspension
Date: Sun, 12 Jun 2005 10:21:57 +0100
MIME-Version: 1.0
Content-Type: multipart/mixed;
boundary="----=_NextPart_000_0001_5B10839D.A09EBF20"
X-Priority: 3
X-MSMail-Priority: Normal

 

 

 

 

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