:memo: Explain how to configure mail recipient for disk reports

Guides/monitor.md

@@ -33,3 +33,13 @@ or
 or
 
 `atop`
+
+### By mail
+
+Edit `/etc/smartd.conf`
+
+In `DEVICESCAN -d removable -n standby -m root -M exec /usr/share/smartmontools/smartd-runner`
+
+Replace `-m root` by `-m my.address@mail.perso`.
+
+You may need to restart or reload the `smartmontools.service`.