==== REQUIRED BASIC INFO OF YOUR IREDMAIL SERVER ====
- iRedMail version (check /etc/iredmail-release):  1.3.2
- Deployed with iRedMail Easy or the downloadable installer? downloadable
- Linux/BSD distribution name and version: CentOS 7
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):  MySQL
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? NO
- [IMPORTANT] Related original log or error message is required if you're experiencing an issue.
====

The file  /var/log/messages is flooded by messages about session created and removed by sogo.
Is it possible to stop those messages?

Example:
Nov 17 16:47:01 servername systemd: Started Session 233 of user root.
Nov 17 16:47:01 servername systemd: Created slice User Slice of sogo.
Nov 17 16:47:01 servername systemd: Started Session 234 of user sogo.
Nov 17 16:47:02 servername systemd: Removed slice User Slice of sogo.
Nov 17 16:48:01 servername systemd: Started Session 236 of user root.
Nov 17 16:48:01 servername systemd: Created slice User Slice of sogo.
Nov 17 16:48:01 servername systemd: Started Session 235 of user sogo.
Nov 17 16:48:01 servername systemd: Removed slice User Slice of sogo.

I don't want to change the location of sogo log file because I want to mantain standard configuration.

But /var/log/messages is really difficult to read because it's flooded by those pointless messages.
Thanks.