this thread has some confusing information. you should be able to do something like the following (note that dns returns the same (private) ip that is in the hosts file):
$ cat /etc/hosts
127.0.0.1 localhost.localdomain localhost
10.10.130.165 support01.liquidsys.com support01 s1
$ host support01.liquidsys.com
support01.liquidsys.com has address 10.10.130.165
for testing, it will be goofy, but functional on the lan with the zimbra server, to register private ip's in the public dns. phoenix is right, however, that you probably want to run
split dns in order to
route mail between the zimbra server and the internet.
"First, remember that you need to set up an MX record for the DOMAIN, which points to the A record for the HOST, which will be the IP ADDRESS of the box running zimbra." -from
zimbra wiki - dns