Problem with nagios notifications - POSTFIX

Hi,
I have a problem with the notifications of NAGIOS via e-mail, I use POSTFIX and the version of my nagios is Nagios® Core⢠4.4.6
The problem is that I do not receive notifications of changes of state of the hosts via e-mail
Can u help me?
I have a problem with the notifications of NAGIOS via e-mail, I use POSTFIX and the version of my nagios is Nagios® Core⢠4.4.6
The problem is that I do not receive notifications of changes of state of the hosts via e-mail
Can u help me?