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EmptyInbox MCP Server

local only

EmptyInbox runs on your own machine — the client starts it, so there is no endpoint to ping. 95 installs a week from npm. Last commit 22 Oct 2026.

Zero-config disposable email inboxes for AI agents: create, read mail, await verify codes.

Installs per day peak 291 · avg 32 · +25% w/w
a month agotoday
95
Installs / week
npm · emptyinbox-mcp
4
Stars
4 open issues
22 Oct 2026
Last commit
6 releases in 90 days
MIT
License
HTML

What the code does

We read the source, 1 d ago · rules 995398eba69f

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

  <script src="https://blockonomics.co/js/web3-payment.js"></script>
Page executes code built at runtime static/pay.html:236
        $('qr').innerHTML = code.createSvgTag({ cellSize: 4, margin: 0, scalable: true });

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

run in your terminal
claude mcp add emptyinbox -- npx -y emptyinbox-mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "emptyinbox": {
      "command": "npx",
      "args": [
        "-y",
        "emptyinbox-mcp"
      ]
    }
  }
}
~/.codex/config.toml
[mcp_servers.emptyinbox]
command = "npx"
args = ["-y", "emptyinbox-mcp"]
.cursor/mcp.json
{
  "mcpServers": {
    "emptyinbox": {
      "command": "npx",
      "args": [
        "-y",
        "emptyinbox-mcp"
      ]
    }
  }
}
.vscode/mcp.json
{
  "servers": {
    "emptyinbox": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "emptyinbox-mcp"
      ]
    }
  }
}

Optional settings from the registry entry, left out of the block above: EMPTYINBOX_API_KEY (Existing EmptyInbox API key. Omit to auto-register a free account on the first tool call that needs one; the key is then written to ~/.emptyinbox.json).

Alternatives to EmptyInbox

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GrabMail disposable email
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Disposable email for agents: create an inbox, wait for the message, read the code. No key needed.

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DevInbox
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Real email inboxes for AI agents: create inboxes, catch verification codes, extract OTPs, reply.

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EmptyInbox — questions

Answers built from our own checks of this server.

Why is there no uptime for EmptyInbox?
EmptyInbox runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package emptyinbox-mcp was installed 95 times last week.
How do I connect EmptyInbox?
Copy the ready config from this page. We generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each in the form that client actually reads. It runs locally, so the command pulls emptyinbox-mcp straight from npm; nothing to host, nothing to sign up for.
How many people use EmptyInbox?
The npm package emptyinbox-mcp was installed 95 times in the last week. Week over week that is +25%. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.
Is EmptyInbox open source?
Yes — it is published under the MIT licence, written in HTML, 4 stars on GitHub and 4 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.