Monitor solution can be used to alert and send emails when servers go offline/crash/shut down. This is done by creating an Agentless Monitor Policy that uses the ICMP Availability Status metric, which causes a Remote Monitor Server (RMS) to ping other servers on a constant interval and alert when a server becomes unresponsive. Keep in mind this can result in false positives when servers become too busy to respond to pings.
ITMS 8.x
Monitor Solution 8.x
Create an Agentless Monitor Policy
Add a Metric Rule
Target the Policy
Add an Email Action (Optional)