The general appearance of WordPress emails is generally left to each plugin. All WordPress core messages like New Account Notification, Password Reset, Comment Moderation are just simple text messages whilst many plugins have their own email templating system.
WordPress Plugin E-Mail Templates
Some typical examples of plugins sending emails are contact forms and stores. Some of them have their own email templates sometimes as premium add-ons.
But if you use a contact form AND a store on your site there’s no chance to find one template for both plugins email notifications. To have one single template in your corporate design for all your outgoing mails.
wp_mail() and WooCommerce email template files
If you want to solve this issue the hard way there are some points to get started. All WordPress emails are sent with wp_mail() and there’s a filter in this function where you can add your custom code to load a html template.
If you use WooCommerce for example you can override the default email code in your theme, but for this kind of customization you should plan a few days of work. When I did this myself I decided to create a plugin so I don’t have to do this ever again.
So I created the free WP HTML Mail plugin.
Tutorial: Your own WordPress email template in 2 minutes
WP HTML Mail form plugin support
NinjaForms send quite simple mails, without any template. You can customize the content with placeholders for each form field to create a personalized “Thank you” mail and a more structured admin notification.
WP HTML Mail supports NinjaForms notifications out of the box without any add-ons.
Find out more in this article: Send beautiful WordPress Ninja Forms notifications to your customers
Contact Form 7
With Contact Form 7 you can also customize your message content and add placeholders for your form submissions. The interface is not so comfortable as the NinjaForms UI but it works.
The free WP HTML Mail plugin also works with CF7 email notifications.
Caldera Forms also has a nice user interface and some nice features. You can configure individual email notifications for customers admins and whoever you want.
In contrast to the plugins mentioned above Caldera Forms has it’s own email templates for 75 USD. If you use WP HTML Mail it is completely free.
WPForms and WPForms-Lite has a template system where you can add your own HTML template files. But if you also want them to be responsive and work on your mobile devices it’s getting really tricky.
I created an WP HTML Mail add-on for WPForms and the free version WPForms-Lite. There are no additional setting to configure, just install the add-on and your WPForms mails work with your WP HTML template.
WP HTML Mail Shop Support
Easy Digital Downloads
EDD also has its own email templates but they only work for EDD mails and not for any other mails used on your site.
When you used the WP HTML Mail EDD Add-On you can use your general email template for EDD without any more troubles.
WooCommerce has an awful default mail template so I really had to create an add-on for my customer projects.
I heavily extended this add-on during the last two years. Now you can even edit all contents and the products table of your store mail right from the WP HTML Mail WooCommerce Add-On.
More supported plugins
If you want to use WP HTML Mail for plugins not listed above please add them to this list or vote them up.