Preventing files on shared folder from being emailed

I have been requested to have all files on a specific shared drive protected against being emailed. This is a public drive that all users have access to, and can add anything to share. All domain users have folder Modify permission, and full control share permission. Is this possible to accomplish with the features available in Server 2003 R2, is there third party software out there, or is this not possible?  
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Short of configuring your smtp gateways to block certain file formats.........what is to stop them from copying the file to an external media and emailing whatever they want from wherever they want?

As long as they have read access,  they have the ability to open the file and "save as" anywhere including the local machine.
following the above correct comment, the only way to do this is to DENY the user rights to the file / folder.
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You also can use various Data Leap Prevention ( DLP) platforms like Vontu or Vericept. You can base it on different groups etc file types... Proofpoint an appliance based DLP AC SPAM Encrytpion appliance can do it as well. I have had great luck with all the above and lean towards Vontu just because I like it better (no I don't work for them).

WRM also does the same thing for preventing email. If you have rights to the file you can email it without any of the above.

Depending what line of business you are in I feel Vontu ro Vericept are the best for data protection. It protects data at rest, data in motion, and data at the end point ( mail)

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I need new fingers. Leap should read Leak for Data Leak Protection (DLP)
I have windows server 2008 standard r2 and excel file is stored on server. i require that client pcs should not intentionally or otherwise email a excel workbook using outlook or webmail

can this be done without vontu or vericept.
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Windows Server 2003

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