Topic: Postfix version Different Cent OS - Ubuntu

==== Required information ====
- iRedMail version: 8.3
- Store mail accounts in which backend (LDAP/MySQL/PGSQL): LDAP
- Linux/BSD distribution name and version: Cent OS
- Related log if you're reporting an issue:
Hi Zhang,

Postfix version is different on Cent OS and Ubuntu using same version of iRedmail 8.3.

Cent OS - Postfix 2.6.6

Ubuntu - Postfix 2.9.3

Why not latest version of postfix on Cent OS also like Ubuntu ?

Is there any performance different on  both Platform because of postfix version.