As a senior frontend developer working on email infrastructure, I've spent countless hours wrestling with the complexities of email HTML. If you've ever built email templates, you know the pain: nested tables, inline styles, Outlook-specific hacks, and the constant battle to make things work across different email clients.
Recently, we migrated our entire email template system to MJML (Mailjet Markup Language), and the results have been transformative. In this post, I'll share why we made the switch, the concrete benefits we've seen, and how MJML solved some of our biggest email development challenges—especially around minification, Outlook compatibility, and responsive design.
MJML is a markup language designed specifically for email development. Instead of writing complex HTML tables, you write semantic MJML tags that compile into email-safe HTML.
# Build all templates
npm run build
# Watch mode for development
npm run watch
The build script recursively finds all .mjml files, compiles them to minified HTML, and outputs to a dist/ folder with the same structure. Component changes automatically trigger rebuilds of all dependent templates.
MJML has transformed our email development workflow. We're shipping templates faster, with fewer bugs, and better cross-client compatibility. The investment in learning MJML paid off within the first month.
✅ MJML reduces code by 80-90% while improving maintainability
✅ Automatic minification reduces file sizes and improves deliverability
✅ Built-in Outlook compatibility eliminates hours of debugging
✅ Responsive design works out of the box without media queries
✅ Component system enables DRY principles and faster updates
Email development doesn't have to be painful. MJML has given us a modern, maintainable approach to building email templates that work consistently across all major email clients. The combination of automatic minification, Outlook compatibility, and responsive design has saved us countless hours and improved the quality of our email communications.
If you're building email templates at scale, I highly recommend giving MJML a try. The learning curve is gentle, and the benefits are immediate.
Have you tried MJML? What's been your experience? I'd love to hear your thoughts and any tips you've discovered along the way.
This post reflects my personal experience migrating email template systems to MJML. The views and opinions expressed are my own.