Just released an open source WordPress plugin "Responsive Email using Divi Builder". It offers a UI email builder using Elegant Theme's Divi Builder.
A detail write up is found here https://www.outsourceappz.com/responsive-email-using-divi-builder-a-wordpress-plugin/
It currently handles WordPress new user registration and forgot password emails out-of-box.
Plugin can be found on the WordPress repository here - https://wordpress.org/plugins/responsive-email-using-divi-builder/
Was wondering if you can offer any constructive feedback
Have a nice day.
Regards
J