Prevent Use of all Web based Email???

From: Jado (ploxly_at_hotmail.com)
Date: 08/17/03 

Date: Sun, 17 Aug 2003 00:22:58 +0100

Hi

does anyone know how to stop the use of all internet based web email (i.e.
Hotmail, Yahoo, Excite..etc...)

is there a port used for all such facilities.

basically, i want to enable internet usage for some users, but prevent them
from using web based email programs.

Thanks

Jado

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