Alerts from child node


I have setup a test parent-child node Netdata agent. I have setup the email notifications on the parent node and have successfully tested it both with the netdata account and with a CPU stress test on the Ubuntu Linux server.
Do I have to configure anything on the child node (eg. sendmail) for the email notifications to be send when alerts are triggered like in the parent node or does the parent node detects the alert on the child node and should send the notification from his sendmail setup?

thank you