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Spare Mailbox

Pro verified

Disposable email inboxes with a free API and an MCP server for AI agents

FreeDeveloper Tools
LBy Louis TerrellLaunched Oct 1, 2026 UTC5 comments
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Overview

Spare Mailbox gives you a throwaway email address instantly — no signup, no password, no cookie wall. Open the site, get an address, receive mail in seconds, and keep spam out of your real inbox.

What makes it useful beyond the usual temp-mail site:

  • Free public API. Create an inbox, list messages, and fetch a message body over plain HTTP. No account needed to start, so you can wire it into signup tests, QA runs, and CI without ceremony.
  • MCP server for coding agents. Point Claude, Cursor, or any MCP client at https://mcp.sparemailbox.com/mcp and your agent can create its own disposable inbox and read the confirmation email itself — no copy-pasting verification codes between a browser and a chat window.
  • Attachments are kept, not dropped, so you can actually test receipts, invoices, and exports.
  • HTML is sandboxed before it renders, so tracking pixels and remote content don't phone home.
  • Available in 19 languages.

Built for developers testing signup and password-reset flows, QA engineers who need a fresh address per test run, and anyone who just doesn't want to hand over their real address to download a PDF.

Runs on Cloudflare Workers, D1, and R2 — fast everywhere, and cheap enough to keep the core free.

Screenshots

Spare Mailbox screenshot 1

Discussion (5)

  • T

    Trung Lê Thành

    Oct 2, 2026, 7:45 AM UTC

    Good tools, cannot imagined about how this tool can be creating and supporting my job

  • T

    Tú Nguyễn

    Oct 2, 2026, 7:54 AM UTC

    Really useful tool, saves me from giving out my real email everywhere. Clean and fast too.

  • L

    Leandro Travis

    Oct 2, 2026, 10:30 AM UTC

    Everything feels pretty straightforward, and it’s been really helpful so far. Great job!

  • A

    Antoine Sementro

    Oct 2, 2026, 10:33 AM UTC

    This is the best app I've ever used. I can't imagine my life without this app now.

  • K

    Kevin Hazz

    Oct 2, 2026, 10:35 AM UTC

    Great tool for creating temporary email addresses quickly and easily. The API integration is especially useful for testing and automation. Simple, convenient, and developer-friendly

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