thebluecube

This plugin is intended to be useful more for developers than other types of users.
Have you ever had a client who likes to be able to independently update the content of the emails that your code is sending out programmatically? If so, this plugin might help you make your client happy.
How to use:
When you activate the plugin, it adds a custom post type to your website called “Email Templates”. You can create your templates using this custom post type. Templates can contain placeholders for your code to fill them up with desired values. A placeholder sample would be {USERNAME} or {USER_EMAIL}. Please note, placeholders should not contain lowercase letters.
This plugin creates a global instance of the BlueCube\Email_Template class which is called $bluecube_email_template. Once you have created a template, you can use the sendEmail() method of the instance to send out your emails.
<pre><code>$email_args = array(
 'template_title' => 'your-template-title',
 'to' => $email,
 'variables' => array('username' => 'JohnDoe', 'user_email' => 'test@test.com'),
);
$bluecube_email_template->sendEmail($email_args);
</code></pre>

Blue Cube Email Templates

This plugin provides an email template system for developers to send programmatic emails which their clients can easily update the emails content.

Mário Valney

<a href="https://wordpress.org/plugins/contact-form-7/" title="Install it first, of course" rel="ugc">Contact Form 7 (CF7)</a> is a awesome plugin used by 1+ million WordPress websites.
But even it allow users to use HTML instead of just Plain Text email it’s not trivial to users who aren’t developers create something really pro.
However, time to leave all your worries behind! As a recently launched “Contact Form 7 – HTML Mail Template Extension” will allow you, WordPress developers or not, to use a simply but beautiful HTML Template in your CF7 so users will get better emails than just amount of text.
<h4>Configurations</h4>
Easily and quickly! No configurations required to start, but you can change a lot of stuff like colors, header image and width (by now… new versions will come).
<h4>Email Template</h4>
The plugin applies a HTML template to email sent from your CF7. The Template is optimized to show your HTML emails perfectly in the most popular email browsers including mobile ones.

HTML Template for CF7

Improve your Contact Form 7 emails with a HTML Template.

Blue Cube Email Templates vs HTML Template for CF7