Mailbox MCP Server

What the code does

We read the source, 21 h ago · rules 3dff92dd89df

A value the model can set ends up inside a file or shell call. That is not a flaw by itself — for a terminal server it is the job — but it is where things go wrong when it is not.

    writeFileSync(filePath, result.data, { mode: 0o600 });

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.

    const child = spawn(opener.cmd, opener.args, { detached: true, stdio: "ignore" });

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

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.

claude mcp add mailbox-mcp -- npx -y mailbox-mcp

{
  "mcpServers": {
    "mailbox-mcp": {
      "args": [
        "-y",
        "mailbox-mcp"
      ],
      "command": "npx"
    }
  }
}

[mcp_servers.mailbox-mcp]
command = "npx"
args = ["-y", "mailbox-mcp"]

{
  "mcpServers": {
    "mailbox-mcp": {
      "args": [
        "-y",
        "mailbox-mcp"
      ],
      "command": "npx"
    }
  }
}

{
  "mcpServers": {
    "mailbox-mcp": {
      "args": [
        "-y",
        "mailbox-mcp"
      ],
      "command": "npx"
    }
  }
}

This one needs environment variables set before it will start: MAILBOX_MCP_PASSPHRASE (Passphrase used to encrypt IMAP/JMAP credentials at rest. Required for IMAP and JMAP accounts.). The author declared them in the registry entry; get the values from the project itself.