I have a Zimbra appliance I was configuring for a client. I build the server in my workshop network 192.168.0.0/24 and then took the VM after configuration to the clients, whose network was 192.168.1.0/24
I changed the IP address of the appliance and was able to manage it after restarting, but I was unable to relay mail through it anymore.
The postfix mynetworks command sill only showed "127.0.0.0/8 192.168.0.0/24" (note this was after doing a password reset on the "zimbra" user to enable me to run a console with enough access - it was not using the admin password I set with the initial install - login using su - zimbra at the console was failing when logging in as vmware) which I have now found has broken most of the services 8(
Anyway, how are you supposed to change the network the appliance is in without a full reinstall?