greylist

==== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.9.2
- Linux/BSD distribution name and version: Centos 6.5 64
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): MySQL
- Web server (Apache or Nginx):Nginx
- Manage mail accounts with iRedAdmin-Pro?
- Related log if you're reporting an issue:
====

Hi, I type : vi /etc/postfix-policyd.conf  to disable greylist. But it displays blank content.

I am a new hand,my skill in Linux is very poor.  Could you please type the command lines for me directly to close the greylist ?

Many thanks!