setup domain name for IredMail

==== Required information ====
- iRedMail version: lastest?
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: ubuntu server 12.10
- Related log if you're reporting an issue:  none
====

Hello everyone!

I'm doing a test for make a presentation of IRedMail. The server is hosted under a static IP with PfSense as firewall.

I want to point one of my domain name to the mail server. How do I setup the DNS in my domain hotel and what should I do in the firewall and what settings do I have to do on my ubuntu machine?

I'm a neewbie, first time setting up a mail server.