Installing a Proxy server?

Ok.
I have come a bit further then last time.
I have managed to get both my internal mailserver and my external mail gateway up and running. They are talking together and mail is flowing as intended.
On the mail gateway in the DMZ local delivery is turned off.
On the internal mail server I now have IMAP running and I'm using Squirrel mail for web based mail.
Web mail is delivered from the internal gateway address through NAT.
I'm running the external web service on the mail gateway in the DMZ.
I'm running internal webservices on the internal server.
VPN connects directly to the internal router.
Wireless services connect directly to the internal network
I have bought a second router to put between the ISP and my DMZ. Once I have installed this router I will start to restrict the flow of information.
Now I would like to take a look at how to set up a proxy server.
I know what it is for, and where to put it but I don't know how to configure such a device.
Could you please point me to some reading material on this issue?
Perhaps something of similar quality as the documentation on postfix.org.
TIA
Hans

Just wondering...
Should I be asking this question on another forum?
If so, on which forum?
Hans

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