This may be a dumb question, I'm pretty new to all this. I have a mail server running on a shared web host. We receive mail from several different domain names. I am trying to set up a mail server here at our office using Zimbra. I'm not sure how to setup the new mail server so that I can test it out without changing the DNS. Of course, I don't want to change the DNS until I know it is working. And I would like to have as little down time while making the transition as possible.
I've got Zimba installed on the mail server using a DynDNS.org address temporarily. It can send but cannot receive. I'm not really sure where to go from here. Could someone please point me in the right direction.