Unsure Greylisting is Active

iRedMail 0.8.7
MySQL
CentOS 6.5

I'm not seeing anything in /var/log/maillog. or /var/log/cbpolicyd.log about greylisting at all. I'm receiving SPAM that is quite obvious and upon testing from outside email accounts there is no delay in mail flow such as there would be if greylisting were in effect.

Please advise.

==== 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:
====