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if your users are using the ISP's SMTP server, you should easily be able to block port 25 traffic vby configuring the users to use SMTP submission on port 587. This is an authenticated session and is FAR better to use anyway than generic SMTP.
I've gone ahead and blocked port 25 on the linksys router for outgoing traffic, and then setup Outlook to send through port 587. Thanks for Barrulus for that suggestion. I've also used NETSTAT on each machine to locate the offender. For future use i've gone ahead and downloaded pfsense to monitor outgoing traffic
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