Can I prevent the emailing of certain files?

We have certain secure files on our network that I would like to prevent from being emailed.
Is there a way I can do this?
I have a Windows 2003 DC running MS Exchange 2003 and Symantec Mail Security 5.0.
steveLaMiAsked:
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jimmymcp02Connect With a Mentor Commented:
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FourBeersCommented:
You can actually set this in Outlook, there are some reg keys you can edit (check text halfway down about recent Outlook versions), so it blocks attachments in a similar way to how .exe files are blocked:-
http://www.slipstick.com/outlook/esecup/getexe.asp

Then you might just need to import that key with a login script (or there are other ways these days like custom Administrative Templates, or Server 2008 Preferences).

In Outlook 2007 you can use a downloadable Administrative template with a GPO to set this:-
http://technet.microsoft.com/en-us/library/cc178961.aspx
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steveLaMiAuthor Commented:
I was talking more like specific spreadsheets that I do not want emailed out of our organization.
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