Multiple Domains with public IP's in iRedMail ?

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

Has anyone ever setup multiple domains with each having a unique public IP for each domain in iRedMail ?  If so, pointers would be appreciated.

thanks