I am working on a client's firewall. It is being used as a VPN only and 
is blocking all other traffic. The client has asked me to setup email 
service through the firewall to a Comcast.net email address. I have run 
into some major difficulty with this because Comcast's SMTP server uses 
several different IP address and I can't point to one that stays long 
enough to connect. Does anyone know how to either only allow POP and 
SMTP traffic through the firewall or how to point to a dynamic IP? It 
would be a great help and make my client awfully pleased.

Thanks,
Nathan