max daily rcpt per user

======== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.9.0
- Linux/BSD distribution name and version:         CentOS release 5.5 (Final)
- Store mail accounts in which backend:              LDAP
- Web server (Apache or Nginx):                           Apache
- Manage mail accounts with iRedAdmin-Pro?       yes v2.1.2
- Related log if you're reporting an issue:
====

Hi all,
I would like to set a limit of 1000 emails sent daily per user basis.
In other words any authenticated user should be able to send max 1000 emails in 24h.

I'm trying to set it through /etc/policyd.conf without success.

policyd.conf and main.cf attached to this post

Thanks for your help,
Cocco.