Security-Enhanced Linux (SELinux)

For show status:

[root@mail ~]# getenforce
Disabled

For Disable SELINUX :

[root@mail ~]#setenforce 0

[root@mail ~]# vim /etc/sysconfig/selinux
SELINUX=disabled

For Enable SELINUX :

[root@mail ~]#setenforce 1
[root@mail ~]# vim /etc/sysconfig/selinux

SELINUX=enforcing

NB:After change enforcing/disable you must restart your server