My LAN is spamming me ???

Hello Gurus,
Win2003 SRV R2
Exchange 2003
25 Clients machine.
my pb is that I am receiving like 100 emails of spam...
after many investigations...it turned out that my pb is internal..
since most of these spam emails are from within my LAN ...being sent from my users accounts...
(whereas they are not sending ...)
please help... How do I fix that ?
I installed Malaware's and did not find anything on my server...
any other tools to help?
thanks
ammounpierreAsked:
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NpatangCommented:
Check couple of things
1) Make sure that Relay is not open on the server.
2) make sure that all the filtering are on the exchange server.
3) Make sure that on the firewall only the exchange is allowed to send mails , no other IP should be allowed.
4) Also if you are nnot using any SMTP clients block the SMTP connections to exchange server.
 Check this link
http://www.petri.co.il/block_spam_with_exchange_2003.htm
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ammounpierreAuthor Commented:
I am not very knowledgeable with exchange...can u please detail ??
thanks..
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NpatangCommented:
1) Make sure that Relay is not open on the server.
Unserstanding what is relay http://support.microsoft.com/kb/895853.. ( itmeans other then your users , no other external users can send mails from your exchange)
How to check is server is open for relay or not
http://www.checkor.com/
2) make sure that all the filtering are on the exchange server.
http://www.petri.co.il/block_spam_with_exchange_2003.htm
3) Make sure that on the firewall only the exchange is allowed to send mails , no other IP should be allowed
The same has been mentioned on the above web link
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ammounpierreAuthor Commented:
Npatang, sorry for being late but I had a small health issue.
I did try what u mentioned ...not workin...
still receiving around 100 emails sent from my own users !!!!! where are they are not sending..
I installed Symantec corporate on the server and on the PCs but didnt find anything suspicious..
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ammounpierreAuthor Commented:
??
How can there be emails sent from by behalf as spams ?
please help.
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