Email
Sends an email when the notification event is triggered.

Config

Dynamic Message Fields
As noted in the screenshot above, all text fields can use templating and special variables.
Send Message via Queue
Whether to send the message via the queue or immediately. On by default.
For performance reasons, it's recommended to send messages via the queue whenever possible.
Body Editor
The Email Body field offers two editing modes, switchable at any time via the mode toggle in the field heading.

Rich Text
Provides a basic WYSIWYG editor for writing prose-heavy notifications with a few inline Twig interpolations.
Code
A code-editing interface which provides Twig hints and syntax highlighting, making it easier to write complex Twig logic.
For intricate Twig logic, use Code mode or an {% include %}
Writing a lot of Twig tags? Switch to code mode to get hints and syntax highlighting.
For extremely long or complex messages, use an {% include %} pointed to a hard-coded Twig template file.
Troubleshooting
When sending email messages, Notifier relies on Craft's own internal mail configuration.
Problems sending out emails?
Follow the official Craft guide for Troubleshooting Email Errors.