So ...

Upon activation, go to Appearance => Email Templates to create your own email templates.

Now, this plugin uses the default theme customizer which will allow you define your own email templates with a live preview feature included. You'll be taken to the template customizer screen which looks like this:

As you can see, the customizer has different sections. As a first step, you'll have to select the settings tab where you can enter the name of your site and the email address to use in the from field of your outgoing messages:

By default, the plugin will use the email address defined in you Wordpress settings, but you can change that to use any other email address.

Next, you'll have to click on the back arrow icon to return to template sections.

Under the "Template" tab, you'll be able to choose between a full width or boxed layout email template, and of course, to choose a background color for your template. I am going to select a 680 px width boxed template with a yellow background:

Next, under the "Email Header" tab you can define the header of your email template. If you want, you can add a logo image and of course, you can use your own customized text (text size, alignement, color, etc):

By default, the plugin will show your site’s name as text in the email header and of course, you can change that to whatever you like ...

Next, under the "Email Body" tab you can change the font size and colors for the the actual email template:

Finally, there is a "Footer" tab where you can customize the footer section of your email (font, background, text color, etc). By default, the plugin shows the name of your site ...

OK. Now let's see the magic ...