https://mjml.io/
MJML - The Responsive Email Framework
The only framework that makes responsive email easy. MJML is a markup language designed to reduce the pain of coding a responsive email.
mjmlresponsiveemailframework
https://documentation.mjml.io/
Documentation for MJML - The Responsive Email Framework
MJML (Mailjet Markup Language) is a markup language designed to reduce the pain of coding a responsive email.
documentation formjmlresponsiveemailframework