SOGo mail filter

==== Required information ====http://www.iredmail.org/support.html
- iRedMail version (check /etc/iredmail-release): 0.9.2
- Linux/BSD distribution name and version: Ubuntu 14.04
- Store mail accounts in which backend (LDAP/MySQL/PGSQL):  MySQL
- Web server (Apache or Nginx): Nginx
- Manage mail accounts with iRedAdmin-Pro? no
- Related log if you're reporting an issue:
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Hi, how to enable mail filter in SOGo?

Thanks in advance,

Fabiano.