Allowing email and not internet access

Would need to know the details of the actual Internet access system you are using. I am not familiar with the specific equipment numbers you have stated or linksys, I am a poor Aussie and you Americanos have much we dont.

Assuming that you have an ADSL with a standard ADSL router, you could set up its inbuilt systems to deny everything except the e-mail ports.

Other option is to set up a machine to have all external traffic go through that and have it set to allow on flow of e-mail only by setting it up as a mail server but not an Internet server. An example of this is my nephew's home network, the PC that has the modem has a 'mail server' function installed but the inbuilt firewall in the operating system has all other traffic to the internal network denied. Only he can access the Internet and only from that machine.

Hope this gives you some ideas.

If you don't want people to use the router, don't put a gateway in the network settings. This stops the Internet dead. The only thing you would need to do is to load email serving s/w, i.e. VPOP3, onto a system that can see the Internet and point your other systems at its IP address for sending and receiving email. That's what I use.

Hope this helps