Mailpal Server

Free email for AI agents -- MCP server for mailpal.com

npx mailpal-mcp-server

npm License

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Why MailPal?

• Free forever -- every AI agent gets a real @mailpal.com email address at no cost
• Hardware attestation -- emails are cryptographically signed by your TPM, proving they came from real hardware (via 1id.com). Attestation is ON by default.
• Full protocols -- SMTP, IMAP, JMAP, CalDAV, CardDAV. Not a toy API -- a real mail server powered by Stalwart

Tools

Tool	Description
mailpal_activate_account	Create your @mailpal.com email address (two-phase Proof-of-Intelligence challenge)
mailpal_send_email	Send email with hardware attestation ON by default (mode 2 = SD-JWT, mode 1 = direct TPM CMS, mode 0 = none)
mailpal_check_inbox	Check inbox for messages -- returns summaries with sender, subject, date, preview
mailpal_read_message	Read full message content including text body, HTML body, and all metadata
mailpal_subscribe_to_inbox	Subscribe to real-time "You've Got Mail!" notifications when new email arrives
mailpal_wait_for_email	Block until new email arrives or timeout (requires subscribe first)
mailpal_register_email_callback	Register a webhook URL to POST when new email arrives
mailpal_unregister_email_callback	Remove a previously registered webhook callback
mailpal_jmap	Raw JMAP passthrough -- delete, move, flag, search, folders, contacts, calendars, sieve filters, blob upload, anything JMAP supports
oneid_get_or_create_identity	Get or create a hardware-anchored 1id identity for this agent
oneid_status	Full picture of identity, devices, connected services
oneid_get_bearer_token	Get an OAuth2 Bearer token for the current identity
oneid_sign_challenge	Sign a verifier-provided nonce to prove hardware identity
oneid_verify_peer_identity	Verify another agent's identity proof bundle
oneid_list_credential_pointers	List credential pointers for an identity

The mailpal_jmap tool gives your agent access to the full JMAP specification (RFC 8620/8621) and all Stalwart extensions. If a convenience tool doesn't exist for what you need, use this.

Quick Start

1. Get a 1id.com identity

npx 1id enroll

This creates a hardware-anchored identity and gives you a JWT token.

2. Add to your MCP client

Cursor (~/.cursor/mcp.json):

{
  "mcpServers": {
    "mailpal": {
      "command": "npx",
      "args": ["-y", "mailpal-mcp-server"],
      "env": {
        "MAILPAL_TOKEN": "<your-1id-jwt>"
      }
    }
  }
}

Claude Desktop (claude_desktop_config.json):

{
  "mcpServers": {
    "mailpal": {
      "command": "npx",
      "args": ["-y", "mailpal-mcp-server"],
      "env": {
        "MAILPAL_TOKEN": "<your-1id-jwt>"
      }
    }
  }
}

Windsurf (~/.windsurf/mcp.json):

{
  "mcpServers": {
    "mailpal": {
      "command": "npx",
      "args": ["-y", "mailpal-mcp-server"],
      "env": {
        "MAILPAL_TOKEN": "<your-1id-jwt>"
      }
    }
  }
}

3. Or use the hosted endpoint (zero install)

{
  "mcpServers": {
    "mailpal": {
      "type": "streamable-http",
      "url": "https://mailpal.com/mcp",
      "headers": {
        "Authorization": "Bearer <your-1id-jwt>"
      }
    }
  }
}

The hosted endpoint also supports real-time "You've Got Mail!" notifications via MCP resource subscriptions and SSE.

Environment Variables

Variable	Required	Description
MAILPAL_TOKEN	Yes	1id.com JWT token for authentication
MAILPAL_API_URL	No	Override API base URL (default: https://mailpal.com/api/v1)

Also Available As

• Python: mailpal-mcp on PyPI -- pip install mailpal-mcp
• Hosted endpoint: https://mailpal.com/mcp (Streamable HTTP, supports real-time notifications)
• REST API: https://mailpal.com/api/v1/ (docs)
• Direct IMAP/SMTP: imap.mailpal.com:993 / smtp.mailpal.com:587 (standard email clients)

Comparison

Feature	MailPal	AgentMail	Robotomail	Nylas
Free tier	Unlimited	100 msgs	Limited	Paid
Real SMTP/IMAP	Yes	API only	API only	Yes
Hardware attestation	Yes (ON by default)	No	No	No
CalDAV/CardDAV	Yes	No	No	Yes
MCP server	Yes	Yes	No	No
JMAP passthrough	Yes	No	No	No
Real-time inbox push	Yes	No	No	No
Self-hostable	Yes (Stalwart)	No	No	No

Development

git clone https://github.com/mailpal-com/mcp-server.git
cd mcp-server
npm install
npm run build
node dist/index.js

Test with MCP Inspector:

npx -y @modelcontextprotocol/inspector

License

Apache-2.0 -- see LICENSE.

Built by Crypt Inc. -- the team behind 1id.com and mailpal.com.