I don't have the luxury of a dedicated email server in my small business. We currently have a machine running apache, php, mysql, postfix, etc. I would like to use zimbra, but can't give up the apache2, php, mysql parts immediately. So, I've read the forum posts and have tried to set up Zimbra on other ports, but have hit a snag. If I use the browser to go straight to the zimbra server:

http://mailhost.example.com:8080

All is well. However, when I try to use the proxy:

http://mail.example.com

Zimbra gives me a grey screen and stops. Anyone have any suggestions on where to start solving this problem? My apache config looks like this:

Code:
ServerName mail.example.com

ProxyPass / http://mailhost.example.com:8080
ProxyPassReverse / http://mailhost.example.com:8080