Mail Hi-Jacked-How do I 'stop' it

  Z1100 13:33 24 May 07

I have a dozen or so e-mails 'bounced' back to my domain but not to addresses that I have on that domain. like this one; [email protected]

What should I be doing now.
I have run Ad-Aware, Spybot, SpyWare Guard and Spy Ware Blaster. All come back with no problem found.

I guess this is a malware attack, what do you think it could be?

Here is an example of the content.

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of its
recipients. This is a permanent error. The following address(es) failed:

[email protected]
SMTP error from remote mail server after RCPT TO: [email protected]>:
host []:
550 5.1.1 Recipient not recognised!

------ This is a copy of the message, including all the headers. ------

Return-path: [email protected]>
Received: from ([])
by with esmtp (Exim 4.66)
(envelope-from [email protected]>)
id 1Hr7B5-0003cG-9R
for [email protected]; Thu, 24 May 2007 08:52:03 +0200
Received: from [] (
by with esmtp (Exim 4.66)
(envelope-from [email protected]>)
id 1Hr7B4-00076b-8v
for [email protected]; Thu, 24 May 2007 08:52:03 +0200
Received: from mychat-4d37cf05 ([] helo=mychat-4d37cf05)
by ( sendmail 8.13.3/8.13.1) with esmtpa id 1GmMpa-000PMO-iR
for [email protected]; Thu, 24 May 2007 14:49:53 +0800
X-Mailer: QUALCOMM Windows Eudora Version
Date: Thu, 24 May 2007 14:49:29 +0800
To: [email protected]
From: "Helder hoyt" [email protected]>
Subject: proportion XPSP automatic planet
Mime-Version: 1.0
Content-Type: multipart/related;

Content-Type: multipart/alternative;

Content-Type: text/plain; charset="us-ascii"; format=flowed


  Stuartli 13:36 24 May 07

I'm also getting a lot of this type of "undelivered" stuff at present.

I've run all the usual scans but nothing shows up - I just Delete them.

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