Zimbra Proxy for web frontend

[andy.l]

Hi
I've configured and set up a dedicated server running Zimbra with all roles installed on one box. We're now in the situation that we also have to make mail available of site with a webmail solution.
I've read and I now see that I can install a http proxy role on a dedicated box in the DMZ, but are there any special configuration that has to be done to enable this, or is it as simple as just installing the Zimbra proxy?

/Andy