I thought I give zimbra another try and installation worked pretty smooth on Ubuntu 8.04.
The problem I have is that I am behind a nasty firewall that has pretty much all ports closed except for a few standard ones.
I want to access the admin interface through one of the standard ports and redirect it with iptables on the zimbra server to port 7071.

This is what I added to iptables:
iptables -t nat -A PREROUTING -i eth0 -p tcp --dport 8080 -j REDIRECT --to-port 7071

when I access https://www.example.com:8080 then the server replies, but redirects the request to https://www.example.com/zimbra/?zinitmode=http

How do I setup iptables properly to get this working?
Thanks for any help