Sendmail

I'm going to explain to you my situation, I'm using sendmail 8.8.7 and TIS firewall toolkit, I have a red hat linux 5.2 as proxy server which we use as mail repository. TIS software takes every X minutes all mails here and sends them to our mail server(linux 7.0), but now I want to change of proxy server to a new CSM proxy in another server and with another red hat linux version, where TIS doesn't work, I really don't know how I can configurate it to do the same thing("check the repository and send all messages to our internal mail server").