Exchange is sending SPAM user to user

Hello,
I have an Exchange 2003 server and some users are receiving SPAM emails from themselves. I know this is a SPAM technique but what worries me is that some of the emails have REALLY been sent from Exchange. If I go to the  message tracking centre I can see that the email has been sent. The message ID appears as:

200905197317.46DDB690F56FB0@89-215-118-150.2072968958.ddns-lan.pl.ekk.bg

Is my Exchange server been compromised? Does the user have a virus?

Please help,
Briega
briegaAsked:
Who is Participating?
 
Rajith EnchiparambilConnect With a Mentor Office 365 & Exchange ArchitectCommented:
Authenticated relaying, disable it following this article http://www.amset.info/exchange/smtp-relaysecure.asp

Check whether you are an open relay here http://www.mxtoolbox.com/diagnostic.aspx

Use smtp tarpitting and IMF in exchange 2003 to fight spam.

http://enchiparambil.com/smtp_tarpitting_for_exchange.aspx

http://www.petri.co.il/block_spam_with_exchange2003_imf.htm
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briegaAuthor Commented:
When you click on one of the emails this is the Message History:

From: user@domain.com
To: user@domain.com
Subject: RE: DISCOUNT ID81968 75% OFF on Pfizer!
Message ID: HLCLDNS02F0SpvmoYoZ00002c1c@hlcldns02.hargrove.internal

18/05/2009 00:18 SMTP: Message Submitted to Advanced Queuing
18/05/2009 00:18 SMTP: Started Message Submission to Advanced Queue
18/05/2009 00:18 SMTP: Advanced Queue Failed to Deliver Message
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briegaAuthor Commented:
Thanks for answering.
The open relay check says:

Connect Time: 0 seconds - Good
Transaction Time: 0.516 seconds - Good
Relay Check: OK - This server is not an open relay.

The user is a valid user. Is that email been sent externaly or internaly? Is the user account compromised? Why does it appear in the tracking centre as sent?
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Authenticated relaying, disable it following this article http://www.amset.info/exchange/smtp-relaysecure.asp
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briegaAuthor Commented:
Done! I will monitor the system to see if the issue has stopped. Why does this happen? Is a user machine infected with a virus?
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Rajith EnchiparambilOffice 365 & Exchange ArchitectCommented:
Can be a virus or malicious apps which run on the pc.
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MesthaCommented:
If it was authenticated relaying you could tell - your server would be full of spam. If the password is guessed then the server gets abused. This doesn't look like authenticated relaying.

To me it looks the message has been sent directly to your server, rather than bounced off another relay server. While unusual, it can happen.

Remember - its spam, the entire header cannot be trusted.

Simon.
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briegaAuthor Commented:
Is there any way of stopping this?
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MesthaConnect With a Mentor Commented:
Your antispam tool should be able to deal with those messages in just the same way that it deals with any other spam messages. Just ensure that you haven't white listed your own domain.

Simon.
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