
mjml.
The open source framework for responsive emails
In plain words
MJML is an open source framework that simplifies creating responsive emails by using high-level components instead of complex code. It handles compatibility across email clients from Outlook 2003 to Gmail Inbox through conditional comments, media queries, and fallbacks. Designed for developers and email designers, MJML uses semantic syntax to make building and maintaining responsive emails more straightforward and less time-consuming.
written from the facts on this page · September 2026
From the sources
MJML leverages high level components to abstract the complexity of responsive email. It embeds all of the hacks needed to make emails responsive everywhere, from Outlook 2003 to Inbox by Gmail: conditional comments, media queries and fallbacks. Based on a semantic syntax, it’s very easy to learn, use and maintain.
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