How can i block users from transfering datas via Internet ?

Hi Experts,
would like to know, how can i prevent Clients for transfering datas via internet....
the main server(Windows 2000 base) the client need to go through the Firewall get access to the internet... some users are unable to surf the net (firewall restriction by IP) email system is monitored to check if files more that X kb not allowed...
some clients do have access to the internet... How can i block these users from transfering datas using their private email address? is there a software that can do that?
Thanks
Jocelyn
Jocelyn_r64Asked:
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bbaoConnect With a Mentor IT ConsultantCommented:
some software may do that, according to their prodcut desciptions, but it seems you have to define the pattern by yourself if possible.

Symantec Launches Integrated Anti-Virus and Content Filtering Solution for Web Gateway
http://www.symantec.com/press/2001/n010725.html

Content Analysis Toolkits
http://www.amikanow.com/content/ca_toolkit.asp

if you think firmware as one kind of software, then CBAC is it:

Configuring Context-Based Access Control
http://www.cisco.com/univercd/cc/td/doc/product/software/ios121/121cgcr/secur_c/scprt3/scdcbac.htm

other URLs for your reference:

A Case-Based Approach to Adaptive Information Filtering for the WWW
http://wwwis.win.tue.nl/asum99/marinilli/marinilli.html

CONTENT FILTERING VS. BLOCKING
http://www.securitysoft.com/content_filtering.html

hope it helps,
bbao
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jvuzCommented:
Maybe blocking the webmail sites
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Jocelyn_r64Author Commented:
it would be really difficult job to do... there are so many free webmail sites...
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bbaoIT ConsultantCommented:
Jocelyn_r64, as you mentioned, it would be a really difficult job. anway, just a thought coming into my mind, if you have a powerful gateway which supports context based content filtering, you may define a pattern to recognize email headers in http streams, and blcok or drop the suspected packets. of course, even with the most advanced AI technology, we still can not 100 percent guarantee taht you can blcok all the traffic that should be blocked. regards, bbao
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Jocelyn_r64Author Commented:
Hi Bbao
Is there a software that can do that? any possibility?
thanks
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Jocelyn_r64Author Commented:
Thanks Bbao,
i tried the URL's.. i found one of them interesting and i requested some info and i am still waiting for a reply regarding the software.....
Regards
Jocelyn
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