Let's create some load

Right, so we configured sending email. But it's not very interesting until we actually receive some notifications. Let's increase the load on our test system. In the console, launch the following:

$ cat /dev/urandom | md5sum

This grabs a pseudo random, never-ending character stream and calculates its MD5 checksum, so system load should increase as a result. You can observe the outcome as a graph—navigate to Monitoring | Latest data and click on Graph for our single item again.

Notice how the system load has climbed. If your test system can cope with such a process really well, it might not be enough—in such a case, you can try running multiple such MD5 checksum calculation processes simultaneously.

Allow 3 minutes to pass and there should be a popup in the upper-right corner, accompanied by a sound alert:

There is one of the...