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Basically what all these people are saying is that you do not need to buy a great big piece of silicone and plastic to filter obscenities.
We need more information to decide on excatly what program you may need, like what are the servers running and what protocols do the users have access to. You could switch over to a Cisco firewall, they have excellent customability to filter words and phrases from mail and ftp. Since you already have a 2600 router it would integrate at the lower layers on the router well.
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