Hello wonderful community!
I'm at my first Zimbra installation and I need some tips.

I had no problem installing the suite and making it work to receive mails. I used this guide: Zimbra setup - part 1 of 2 - YouTube

THAT'S MY PROBLEM: How can I publish my zimbra server on the web and make it accessible from everywere? By now I could only manage to make it work on my LAN..
How should I set my DNS (in the server and in the public domain) to make it work?

That's may parameters (to make it easier for you guys to help me):
Public Static IP (provided by ISP):
Public domain (not hosted by my ISP): labarriera.it
Zimbra server FQDN: zimbra.labarriera.it
Zimbra server private IP:

Thanks for your time!