You are telling the system that a server name refers to a particular IP address instead of your PC looking for DNS to resolve it.
To do this you add a line at the end of the hosts file on your PC. Use a line similar to the one below but change to suit your server IP and name:
my.zimbra.server 192.168.0.1
If you are on Windows: open with notepad, c:\windows\system32\drivers\etc\hosts.
(The text file has no extension just a dot hosts.) Edit and then save.
On Linux, it's the same file but found /etc/hosts
Does that help?
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