I don't have a static IP but my ip does not change very often. I have a few questions on how to setup dns. I modified the mx record at my registrar to point to xxx.dyndns.info. I have the dyndns client running on my firewall.

So, on the zimbra server, should I have the local ip address (192.168.0.8) in the hosts file as mail.mydomain.com or the public ip address? Forward ports?