What is Mail Lune?

Mail Lune is an embeddable email builder SDK. Drop a single <email-builder> web component into any web app and your users get a full drag-and-drop email editor — block library, template management, mobile preview, merge tags, and HTML export — all without you writing a line of editor code.

Think of it as the Stripe of email editors: a few lines of code, production-quality results.

Key concepts

Architecture overview

Your app
└── <email-builder api-key="..." user-id="...">   ← Web Component (Shadow DOM)
        ├── Palette panel          (drag blocks)
        ├── Canvas                 (live preview)
        └── Properties panel      (block editor)
              ↕ REST API (api.maillune.com)
              ├── /v1/keys/validate   (auth + plan features)
              ├── /v1/templates       (save / load designs)
              └── /v1/assets/upload   (image hosting)

The component talks directly to the Mail Lune API using your API key. Your backend doesn't need to proxy anything — just store the blockTree JSON your users create and pass it back when they re-open the editor.