Greylisting and backup MX domains

==== Required information ====
- iRedMail version: 0.8.3
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Linux/BSD distribution name and version: Ubuntu 12.04 LTS
====

First of all, thanks for such a great, and free project. I will try to buy the PRO version to support your work!

My question:

I would like to also enable greylisting for relay domains (backupMX). At the moment in my configuration it seems that greylisting isn't working for non local hosted domains.

Is there a configuration option somewhere in cluebringer or in the postfix configuration?

Thanks!