I have just installed a zimbra instance on a virtual machine to test it. It works but i fail at understanding a couple of things.
My situation is this
the internal domain is "smtp.network.local" and i have a domain managed with dyndns called 2gnetworks.net .
I set up a couple of accounts email@example.com and firstname.lastname@example.org. Now i fail at understanding if when mr. giulio sends an email to ms giovanna it goes in and out or zimbra performs a check with its internal addresses and simply forwards it internally without really using the internet connection.
thanks for your help and 10+ to this fabulous product