Email has become an inescapable tool that everyone uses everyday. It's probably the best place to send a notification if an automated task has detected something. On the other hand, email inboxes are already too filled up with spam messages, so be careful.
Spam filters are also a reality. Be careful with who to send emails to and the number of emails to be sent. An email server or address can be labelled as spam, and all emails will be quietly dropped by the internet.
This recipe will show how to send a single email, using an already existing email account.
This approach is viable for spare emails sent to a couple of people, as a result from an automated task, but no more than that.