junk email outlook 2007

A user i getting returned emails that she did not send in her Junk Mail.
How can this happen & prevent it?

This is the messge
Hi. This is the qmail-send program at presenta.net.
I'm afraid I wasn't able to deliver your message to the following addresses.
This is a permanent error; I've given up. Sorry it didn't work out.
--- Below this line is a copy of the message.

Return-Path: <ilene.rosenthal-schulman@atlantichealth.org>
Received: (qmail 31712 invoked from network); 16 Nov 2010 13:07:21 -0000
Received: from unknown (HELO microsof-007cad) (94.77.183.54)
  by presenta.net with SMTP; 16 Nov 2010 13:07:21 -0000
Received: from [94.77.183.54] by mailhub1.ahsys.org; Tue, 16 Nov 2010 16:37:50 +0300
Date:      Tue, 16 Nov 2010 16:37:50 +0300
From:      "Stacy Dickinson" <ilene.rosenthal-schulman@atlantichealth.org>
X-Mailer: The Bat! (v2.10.03) Personal
Reply-To: ilene.rosenthal-schulman@atlantichealth.org
X-Priority: 3 (Normal)
Message-ID: <975951108.86470965208441@atlantichealth.org>
To: gcanton@presenta.net
Subject: {chislo[5]
MIME-Version: 1.0
Content-Type: text/plain;
  charset=us-ascii
Content-Transfer-Encoding: 7bit


<gcanton@presenta.net>:
vdeliver: Invalid or unknown virtual user 'gcanton'

<gcequality@presenta.net>:
vdeliver: Invalid or unknown virtual user 'gcequality'

jwahexAsked:
Who is Participating?
 
war1Connect With a Mentor Commented:
This is the result of user spoofing your client's address and sending out spam using your client's address in the From field. When email gets block by receiving server, it goes back to your client.

Verify that virus is not sending email from computer without your client's knowledge.  Run antivirus and anti mailware scans.  

If spammer is sending from another server, you cannot do much about the spoofing.  
1. Make sure your client does not click on any links in the spam mail.
2. Report the abuse http://spamlinks.net/track-report-addresses.htm

Here is more info about spoofing and what can be done
http://www.consumerfraudreporting.org/spoofing.php
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jwahexAuthor Commented:
thank you
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