==== Required information ====
- iRedMail version (check /etc/iredmail-release): 0.9.3
- Linux/BSD distribution name and version: CentOS Linux release 7.2.1511 (Core)
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Web server (Apache or Nginx): Apache
- Manage mail accounts with iRedAdmin-Pro? Yes
- Related log if you're reporting an issue:
====
As far as my new installation of iRedMail is working fine but I am just having max 400 users where I am seeing high mail queue on server. Upon monitoring maillog I can see that mail processing is very slow as compared to earlier. I think POSTSCREEN options set on postfix is taking time in lookups and verification.
Can we turn off POSTSCREEN feature in postfix? Will it speed up mail processing? is it safe? or is there any other options to speed up postfix mail processing?