# Introduction

Of course, [more advanced tasks can be carried out](https://dokuwiki.pandorafms.com/manual/!development/en/documentation/04_using/01_alerts), such as alerts on events, correlation, etc. The first alert to create is sending an email when one of the [monitored machines](https://dokuwiki.pandorafms.com/manual/!development/en/quickguides/general_quick_guide#interface_network_traffic) goes offline (with the Host alive module).

Pandora FMS alerts are made up by three elements:

- **Command.**
- **Action.**
- **Template.**

In this particular case, a predefined command will be used (email forwardingt), an existing action will be modified (`Mail to XXX`) and an existing template will also be used, template Critical condition, that will execute the task when the module itself goes into critical state.

See also: "[How Pandora FMS alert system works (video)](https://www.youtube.com/watch?v=LzWx9x6ESbw&t=0s)"