DirectoryBox Ox

Box Ox

Browser inbox, sending API, webhooks and agent access, all in your own Cloudflare account.

Email

Box Ox homepage with the headline "Email infrastructure for Cloudflare developers" and a preview of the inbox
Screenshot: boxox.dev.

Box Ox gives you a browser inbox, a sending API, signed webhooks, templates and a typed JavaScript SDK. It all runs in your own Cloudflare account on Workers, R2, D1 and Queues.

What it does

  • Agent access: an app or an AI agent connects through MCP or an agent API, and you set which mailboxes it can use and how much it can send.
  • Cloudflare Access protects the admin side.

Good to know

  • It is not one-click. You download a zip, check the checksum and run pnpm run deploy, or hand the install link to your coding agent.
  • It needs Cloudflare Access and R2. It runs on your own Workers plan, with no Box Ox subscription.
  • The license is not plain open source. The app uses the Functional Source License, which stops you from building a competing product with it. Each version turns MIT after two years. The SDK and CLI are MIT.

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