设置全部监控项都开启邮件报警：
vim /usr/local/nagios/etc/nagios.cfg
设置
enable_notifications=1 1为开启，0为关闭
如个别监控项只监控不报警：
例如负载load只监控不报警
vim /usr/local/nagios/etc/objects/services.cfg
define service{
use local-service-15x7,services-pnp
host_name sy_frxz_center_121.10.138.31_遂溪新生代
service_description Check Load
servicegroups check_load
check_command check_nrpe!check_load!50,40,30!80,70,60
notifications_enabled 0
}
notifications_enabled设置为0则不发邮件报警