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Build beautiful, responsive email templates visually — then render them anywhere with a single API call.

Maildeno gives product teams a drag-and-drop email editor and gives developers a clean SDK to inject that output into any application stack.

Where do you want to start?

🚀 Quickstart

New here? Get your first email rendered in under five minutes.

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✏️ Email Builder

Learn the editor: templates, merge tags, visibility rules, and exporting.

Explore the builder →
🔌 SDK Reference

Integrate rendering into your app with the JavaScript or Python SDK.

Browse the SDK →

What is Maildeno?

Maildeno is a two-part product:

  • Email Builder — A visual drag-and-drop editor for designing responsive email templates. Teams can manage layouts, merge tags, visibility rules, and export targets all from the dashboard — no code required.

  • Render API & SDKs — A REST API (with official JavaScript/TypeScript and Python SDKs) that takes a template ID plus optional dynamic data and returns a fully rendered HTML, React Email, or MJML string ready to pipe into any email-sending service.

Key capabilities

Capability Description

Drag-and-drop editor

Build pixel-perfect emails without writing HTML or CSS.

Merge tags

Inject dynamic text, URLs, and HTML attributes at render time.

Visibility rules

Show or hide sections based on context values like plan or country.

Multi-target export

Render the same template as HTML, React Email, or MJML.

Scoped API keys

Restrict each key to specific render targets for least-privilege access.

Sync + async SDKs

Python SDK ships both MaildenoClient (sync) and AsyncMaildenoClient (asyncio).

Supported render targets

Target SDK constant Use case

HTML

"html" / "html"

Any transactional email service (SendGrid, Postmark, SES, etc.)

React Email

"react-email" / "react-email"

Next.js / React-based email pipelines

MJML

"mjml" / "mjml"

Teams already using MJML for cross-client compatibility

Need help?