The email notifier sends alerts as emails.
If you are hosting Humio yourself, you must configure how emails are send.
This notifier will by default send out a nicely styled email with the most important aspects of an alarm, including a link back into Humio with the result.
Should you for some reason want to modify the e-mail you can do so by checking “Use custom email template” and fill out the “Message Body Template”. See Notifier templates for how to use our templates.