If I want my mail server to handle myfirstpublicdomain.com, I put a line in the /etc/hosts file like:
What happens when I want it to handle mail mynextpublicdomain.com as well?
192.168.0.36 mail.mypublicdomain.com mail
Also, what address should I use for local clients that want to send mail via Zimbra? Assuming that they won't want to point to mail.mypublicdomain.com , I put a name in the local DNS that maps mail.localdomain to 192.168.0.36 and the clients use that name for local access.