The sendmail service must be running, otherwise important system mail to root is not delivered.
# svcadm enable smtp:sendmail
The ntp service must be installed on all systems where security and compliance is desired.
# pkg install service/network/ntp
The Network Time Protocol daemon must be enabled and properly configured as a client. The /etc/inet/ntp.conf file must include at least one server definition. The file must also contain the line restrict default ignore to prevent the client from also acting as a server.
# vi /etc/inet/ntp.conf . . . server server_IP_address iburst restrict default ignore ... # svcadm enable ntp