Does anyone know how to use policyd-rate-limiter?

Hey guys

I have a linux server that runs IMSCP 1.5.1. I need to set up a global outgoing rate limit for all email users. The server is running latest debian, and in the apt repo I have something called policyd-rate-limiter which judging by it's lackluster documentation should be perfect for what I intend to achieve.

This is the documentation I followed:

https://pypi.python.org/pypi/policyd-rate-limit

According to this I should put this into my main.cf

smtpd_recipient_restrictions = ..., check_policy_service { unix:ratelimit/policy, default_action=DUNNO }, ... 

I do that, and I see in the syslog that it does something with what looks like incoming emails not outgoing? Anyways the limits don't work. So if anyone has some advice or experience in this I would gladly get them a reddit silver.

Thanks in advance.