MSN doesnt work using http - just block off masquerading to port 1863.
Yahoo is almost next to impossible to stop. But you could try blocking
off thise sites
connection server : cs.yahoo.com
edit server : msg.edit.yahoo.com
http proxy server : http.pager.yahoo.com [This maps out to a whole bunch
of servers ...]
Mind you it will also break most of the features of Yahoo. Unfortunately
Yahoo messenger is way too much integrated with the whole web based
account maintenance system.
Mithun
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