i want to use Zimbra mail server with SugarCRM support.

First i installed SugarCRM. than Zimbra OpenSource Edition.
i dont have seperate registred domain but i have static publi IP(say xx.xx.xx.xx) .
i want to use this zimbra mail server for my local network users..

so how can i configure the Zimbra and /ete/hosts file..

My machine name is linuxzimbra and i dont have any domain.

shall i create any domain, if so, where i have to create the domain.

also tell me how to create MX and A records...

pls dont give me the links to the existing forum, because i didnt get proper solution from the existing forums...

pls reply..