Blocking Internet Access

[kendaukcat]

Hey Gang...here is my issue.

My goal is to block 4 PCs from accessing the internet, with the ability to access only an internal Exchange 2003 Server running OWA.

Here is what I have done so far:

I have created a client address set with all of the statically assigned IP adresses of the PC's I want to block.

I have then created an access policy that redirects any http request to

http://mail.<mydomain>.com

that applies to the client address set I created above.

Unfortunately, all http requests are still being granted. Is there something I am missing?

Thanks in Advance,

Ken