Hello: I am an intermediate IT support person for a high school computer lab. I'm having some trouble preventing students from accessing webmail. I thought the easiest thing to do would (rather than trying to ban 20,000 websites supplying email) would be to remove the ports that support webmail. I've done some research into POP, etc. and discovered that ports 109, 110, etc. support web based mail activity. Could someone explain to me how these ports might be closed? PS. I went into Network Connections, double clicked TCP/IP protocol, advanced properties. I found some filtering options in there and messed around but to no avail...