I'd suggest you remove the current installation with the following command:
That will remove everything from the system (according to your output above the install has been run multiple times, not a good idea).
When you've done that I'd suggest your read the
Quick Start Installation Guide and make sure your /etc/hosts file is set correctly. After that, make sure you have valid DNS A & MX records set by following the
Split DNS set-up. You should also search the forums for details on how to check the configuration is correct (this has been covered and answered many times), if everything is OK then try the install again. If you still have problem then post some details of what you've done and the required information from your DNS records and hosts file and any errors in the install log or the Zimbra
log files.