Users keep getting emails from them selves...

Hi,
I administer a small network of about 100 users all with their own email addresses, and recently I have had a few calls from users who are getting spam emails from their own email address..  mainly stuff like, the usual..  sex, viagra, etc, etc..  I have already blocked as many phrases as I can to try and stop these mails getting through, but how do I stop mails coming from their own address...  either through sophos puremessage or even exchange 2003.   Baffled..  any help would be greatly appriciated..

Thanks

Darren.  
dazzzorAsked:
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millsclConnect With a Mentor Commented:
Postini could stop this.  It is a spammer trick to get by the filters.

Other third party products may work and be cheaper.  YMMV.
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Jamie McKillopIT ManagerCommented:
Hello,

This is a common spammer trick. You won't be able to prevent this with Exchange. You will need some type of third-party anti-spam software.

JJ
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dazzzorAuthor Commented:
thanks jj
I use sophos anti-virus business console which comes with puremessage email filter..  do you know how I would do this..??

Darren
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Alan HardistyCo-OwnerCommented:
Please read my EE Article for ways to prevent this without resorting to 3rd party software:
http://www.experts-exchange.com/articles/Software/Server_Software/Email_Servers/Exchange/How-to-prevent-Spoofed-Emails-in-Exchange-2003.html
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Alan HardistyConnect With a Mentor Co-OwnerCommented:
You don't need 3rd party software as long as you have Exchange 2003 Service Pack 2 installed, you just need to configure the built-in tools as per my article:
http://www.experts-exchange.com/articles/Software/Server_Software/Email_Servers/Exchange/How-to-prevent-Spoofed-Emails-in-Exchange-2003.html 
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