Empty Inbox MCP Server

Disposable email inbox API for AI agents and developers. Create temporary email addresses, receive messages, and read content - via REST API or MCP server. It runs locally over stdio via the published package.

People who work with email and privacy and want it reachable from Claude, Cursor, VS Code, or another MCP client. The project is written in HTML.

VERIFIED ACTIVE

LAST COMMIT 2026-09-18 · ★ 4 · #29 OF 90 MAINTAINED EMAIL · VERIFIED 2026-09-18

HTML · how we verify → /methodology

01 · Install Empty Inbox

before you install - you'll need

Set FLASK_ENV, BLOCKONOMICS_API_KEY, USDT_RECEIVING_ADDRESS, MATCH_CALLBACK before connecting.

Claude Code

claude mcp add blockonomics-emptyinbox-me -- npx -y emptyinbox-mcp

Claude Desktop / Cursor / VS Code - add to config

{
  "mcpServers": {
    "blockonomics-emptyinbox-me": {
      "command": "npx",
      "args": [
        "-y",
        "emptyinbox-mcp"
      ]
    }
  }
}

Same JSON for Cursor. For VS Code, rename the top-level key from `mcpServers` to `servers`.

Using another client? Same JSON, different key

Claude Desktop · mcpServers

Cursor · mcpServers

VS Code · servers

Windsurf · mcpServers

Zed · context_servers

Cline · mcpServers

Roo Code · mcpServers

Continue · mcpServers

LibreChat · mcpServers

Gemini CLI · mcpServers

Codex CLI · mcp_servers

Full setup guides: every client.

02 · Evidence

Security posture

What to check before giving this server access to your agent - from the registry, GitHub, and our own probes. We don't score safety; we show what's verifiable.

runs as local process (stdio) - runs on your machine with your user's permissions

license no standard license detected - usage rights unclear; check the repo before commercial use

npm package emptyinbox-mcp - unscoped; check the name against the project README before installing

registry registry publisher io.github.cnohall is not the repo owner (blockonomics) - the registry entry was published by someone else

03 · Who maintains Empty Inbox

EmptyInbox is maintained by blockonomics. It's the only MCP server we track from this author; the repo dates to Jul 2025.

04 · Facts

repository: github.com/blockonomics/emptyinbox-me
category: email - ranked #29 of 90 actively-maintained email servers as of 2026-09-18.
registry: io.github.cnohall/emptyinbox (active, first published 2026-09-11 · 2 versions)
packages: npm:emptyinbox-mcp

05 · Empty Inbox FAQ

What is Empty Inbox?

Is Empty Inbox still maintained?

Yes - as of 2026-09-18, its last commit was 2026-09-18. We re-verify nightly.

How do I install Empty Inbox?

Run `npx -y emptyinbox-mcp`. The README documents 4 environment variables (FLASK_ENV, BLOCKONOMICS_API_KEY, USDT_RECEIVING_ADDRESS…) to set first. Set FLASK_ENV, BLOCKONOMICS_API_KEY, USDT_RECEIVING_ADDRESS, MATCH_CALLBACK before connecting. You can also paste the ready-made client config above.

Does Empty Inbox run locally?

Yes - it's a stdio server: it runs on your machine (via npx) with your user's permissions. Your data stays local unless the server itself calls external APIs.

06 · Alternatives to Empty Inbox

Alternatives to Empty Inbox

Maintained email servers if Empty Inbox isn't the fit.

More email MCP servers · Email (IMAP/SMTP) (boutquin) · Company Enrichment API · Fluxmail · Email MCP