Add new domain to iredmail

==== Required information ====
- iRedMail version: 0.8.5
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: Ubuntu 10.04 x64
- Related log if you're reporting an issue:
====

Hi Zhang and community!
Sorry if my question has been discussed before.
I have two websites running on the same host. Existing instance of iredmail serves mail for website1. Now I need to make iredmail send and receive mail for website2.
Please, point me how can i achieve that?

I'm thinking about steps below:
1. Add new domain and users in iredadmin panel.
2. Add MX record in DNS for website2.

Is that all? Do i miss something?

Thanks in advance!