MJML Email Markup MCP. Convert complex markup into flawless, cross-client HTML.
MJML Email Markup MCP transforms complex MJML code into responsive HTML emails. Stop debugging CSS for different email clients; simply give your agent the markup and get production-ready HTML that looks right everywhere, from Outlook to Gmail.
Give Claude and any AI agent real-world access
Takes raw MJML code strings and converts them into production-ready HTML that adapts to various viewing devices.
Allows you to quickly iterate on full email designs directly within your chat or development environment without leaving your workflow.
Automatically structures the output to meet best practices for major email service providers, bypassing common client rendering errors.
Checks your input MJML code against industry standards, preventing manual formatting mistakes like improper table nesting or missing required tags.
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What AI agents can do with MJML (Email Markup) MCP: 1 Tool Available
The `render_mjml` tool allows you to take any MJML markup code string and instantly convert it into responsive, clean HTML.
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Start using MJML (Email Markup) MCPRender Mjml
Takes raw MJML markup (XML or JSON) and renders it instantly to responsive HTML.
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Independent Platform Disclaimer: Vinkius is an independent platform and is not affiliated with, endorsed by, sponsored by, verified by, or otherwise authorized by MJML. All third-party trademarks, logos, and brand names are the property of their respective owners. Their use on this website is strictly for informational purposes to identify service compatibility and interoperability.
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The Pain of Email Development
Today, building a single campaign means copying content into multiple tools: you draft in a CMS, check it on your phone, then paste it into an editor that only shows a preview. You end up spending hours fighting nested tables and debugging why background colors or columns look different when viewed through Outlook versus Gmail.
With this MCP, the process shrinks down to one step. Your agent takes your source markup, uses `render_mjml`, and instantly provides you with production-ready HTML that has already been tested against industry best practices.
Generate Responsive HTML via render_mjml
The manual steps that vanish are: checking for CSS conflicts, ensuring every column is wrapped in the correct table structure, and manually adjusting padding or spacing to accommodate different client limitations.
Now you simply provide the structured input; the MCP handles all the necessary structural changes. It's immediate, reliable HTML.
What MJML Email Markup MCP does for your AI
Email development is a nightmare because every client—Outlook, Apple Mail, Gmail—treats HTML differently. Manually coding these templates means fighting complex nested tables and worrying about CSS inline conflicts. This MCP solves that by letting your AI agent handle the heavy lifting. You provide MJML markup (XML or JSON), and this connector transpiles it instantly into clean, responsive HTML.
It’s like having a senior front-end developer available in chat. Whether you're working directly in an IDE or just chatting with your agent, you get immediate, client-standardized results. Because Vinkius hosts this MCP, you connect once and gain access to industry best practices for email design without needing a specialized build system.
019e38c2-db09-72c6-9310-9ea0e4606917 How to set up MJML Email Markup MCP
The bottom line is you skip the debugging steps and get finished HTML ready for deployment.
First, you provide the connector with your raw content—this is either a JSON or XML string of MJML markup.
The MCP uses the render_mjml tool to process this input through its engine, which translates the standardized format into browser-readable code.
You receive clean, responsive HTML output that follows modern email client best practices.
Who uses MJML Email Markup MCP
This MCP is essential for Marketing Operations professionals, front-end developers, and UX designers who spend too much time fighting with email client bugs instead of building campaigns. If your job involves sending emails through multiple platforms, you need this.
They use this to quickly test how a new campaign layout will look in Outlook or Gmail before the actual send date.
They rely on it to generate complex, highly structured email sections without manually writing dozens of nested tables and inline CSS.
They use it to validate MJML syntax and get immediate visual confirmation that their design translates correctly into code.
Benefits of connecting MJML Email Markup MCP
Avoids the 'table hacking' headache. Instead of manually nesting tables to appease Outlook, this MCP handles all client-specific structure automatically when you run render_mjml.
Saves hours of debugging time. You stop spending cycles fixing minor CSS bugs across different email platforms and start focusing on content.
Allows for rapid prototyping. Need a button or section design? Give your agent the markup, use render_mjml, and get an immediate visual preview to approve.
Guarantees responsiveness. The output isn't just code; it's structurally sound HTML that adapts cleanly whether viewed on mobile or desktop.
Keeps you in flow. You don't need to switch between a separate build tool or IDE plugin; your agent handles the conversion right where you work.
MJML Email Markup MCP use cases
Client needs an email template for a major product launch.
The developer asks their agent: 'Can you use render_mjml to take this MJML code and give me the HTML for our new feature announcement?' The agent returns perfect, cross-platform code immediately, bypassing days of manual CSS work.
Marketing team needs to test a flyer conversion.
The marketing specialist pastes their raw JSON markup into the chat and prompts: 'Render this for me.' The agent uses render_mjml and provides a working, responsive HTML output for pre-deployment review.
Designer needs to validate complex button styles.
The designer wants to see how an advanced call-to-action will render. They ask the agent to generate and then use render_mjml on the code, validating that the resulting HTML is clean and accurate.
MJML Email Markup MCP tradeoffs
What to watch out for, and the recommended way to handle each one.
Writing nested tables manually
Copying and pasting raw HTML from a WYSIWYG editor often results in massive, unreadable code blocks that break on mobile devices or get stripped out entirely by Gmail.
Use the MCP to convert your content via render_mjml. This ensures you are generating structured, clean MJML markup first, which then gets converted into robust HTML.
Relying on pure CSS for email structure
Trying to build an entire campaign layout using only modern CSS properties often fails because major mail clients (especially Outlook) don't support them.
This MCP is built specifically around MJML, which encodes best practices that respect the limitations of legacy email clients. Always let render_mjml handle the final conversion.
Debugging client-specific bugs
Spending half a day debugging why a specific background color looks wrong only when viewed in Apple Mail on an older version.
The MCP's engine is designed to account for these differences. By generating the final HTML via render_mjml, you get code that already accounts for multiple client behaviors.
When to use MJML Email Markup MCP
Use this MCP if your primary goal is creating professional, responsive email campaigns intended for a wide audience using various clients (Gmail, Outlook, etc.). If the deliverable must be an email and you're dealing with complex layouts or varying client behavior, this tool is mandatory. Don't use it if you are building simple web pages that only need to look good in modern browsers; then standard HTML/CSS tools suffice. Also, don't rely on it for basic text messaging campaigns, as the markup complexity isn't needed. This MCP exists solely to solve the specific pain of email rendering.
Frequently asked questions about MJML Email Markup MCP
Does MJML (Email Markup) MCP support JSON or XML? +
Yes, it supports both. The render_mjml tool accepts raw markup strings whether they are formatted as XML or JSON.
Can I use render_mjml to just generate a simple text email? +
While you can pass minimal markup, this MCP is optimized for complex, styled emails. For basic text announcements, standard content management systems are faster.
Is the HTML output from MJML (Email Markup) MCP production-ready? +
Yes, the output is designed to be production-grade, incorporating best practices that solve common client rendering issues. You don't need further structural cleanup.
How does render_mjml handle responsiveness? +
It handles responsiveness by generating code structures that adapt columns and sections based on the viewing device size, ensuring a good experience across mobile, tablet, and desktop clients.
What if my MJML markup has an error? Can render_mjml catch it? +
The process is designed to validate your syntax. If there's an issue with the input structure, the agent will alert you before attempting to generate the HTML.