Voidmail (hosted) MCP server

@voidly/mcp-email

Email for AI agents. Create an inbox, read incoming messages as structured data, and send to recipients the human owner has approved. No phone number or CAPTCHA.

Agent inboxes are readable by the server; they are not end-to-end encrypted. Human mail is a separate product.

Install

Requires Node.js 20 or newer.

npx -y @voidly/mcp-email@1.2.1

Add to Cursor

Copy this install URI into your browser address bar. Cursor asks you to review the local command before adding it:

cursor://anysphere.cursor-deeplink/mcp/install?name=voidmail&config=eyJ0eXBlIjoic3RkaW8iLCJjb21tYW5kIjoibnB4IiwiYXJncyI6WyIteSIsIkB2b2lkbHkvbWNwLWVtYWlsQDEuMi4xIl19

For manual project setup, copy the JSON below into .cursor/mcp.json (or ~/.cursor/mcp.json for all projects).

Install in VS Code

Copy this install URI into your browser address bar. VS Code asks you to review the local command before adding it:

vscode:mcp/install?%7B%22name%22%3A%22voidmail%22%2C%22command%22%3A%22npx%22%2C%22args%22%3A%5B%22-y%22%2C%22%40voidly%2Fmcp-email%401.2.1%22%5D%7D

For manual workspace setup, copy the JSON below into .mcp.json at the workspace root. GitHub renders custom app URIs as plain text, so use the copyable snippets above.

{
  "mcpServers": {
    "voidmail": {
      "type": "stdio",
      "command": "npx",
      "args": [
        "-y",
        "@voidly/mcp-email@1.2.1"
      ]
    }
  }
}

These instructions run the local stdio package at 1.2.1. They do not create an inbox. The repository's root .mcp.json keeps that local command as voidmail and also offers the hosted connector as voidmail-hosted at https://api.voidly.ai/mcp/mail. It contains no credentials. The hosted connector has its own tool set; use voidmail_setup to check mailbox configuration before authenticated inbox actions.

Before creating an inbox in a coding agent: voidmailcreateaccount saves an owner key on the local machine. Keep that key outside the agent's shell and file access before handing the inbox to the agent. A 0600 file owned by the same OS user is not enough separation. The server can read message contents; provider acceptance of a send is not delivery.

Claude Desktop

Add to ~/Library/Application Support/Claude/claudedesktopconfig.json:

{
  "mcpServers": {
    "voidmail": {
      "command": "npx",
      "args": ["-y", "@voidly/mcp-email@1.2.1"]
    }
  }
}

This first-time config has no inbox key. After voidmailcreateaccount returns an address and saves the keys, add "env": {"VOIDMAIL_ADDRESS": ""} to this server config and restart the host. If the agent has shell or file tools, use an isolated runtime that can read the agent key but cannot read the owner key; file mode 0600 alone does not separate two processes running as the same user.

Quick Start

After installing the MCP server, use this prompt:

Create one Voidmail inbox and show me its address and where the keys were saved. Draft emails first and wait for my approval before sending.

The draft approval in this prompt is a host workflow request. The API enforces the owner-approved recipient list and content policy; it does not require the owner to review every message body.

For a first receive and send check:

Shortened. The full README is on GitHub.