I looking for information on if a single public IP address can support multiple servers. I have a single RAQ4i that is working fine. it is hosting several sites and amile for all of those. My thought is to separate the mail from the web and use two different machines. I have tried this as a test setting up the second machine in DNS of the first machine but to no avail. the second server is not seen throught the public IP address. If I need to give more specific network information let me know - I though that surely someone else had done this already.
It depends on the webmail package, if your using openwebmail or neomail that is installed with a pkg then you need to adjust the router a little more.
if mail is 192.168.1.3 then setup a port forward something like
public_ip:8080 <> 192.168.1.3:80
That way you people log on to their webmail on port 8080 and the router directs this to port 80 on the mail server. You can setup redirect aliases on the web machine to forward people who goto the /webmail directory.