MailFlat — MCP server

Native Model Context Protocol server for MailFlat. Gives Claude Desktop, Cursor, or any MCP client disposable inbox tooling — create inboxes, wait for OTP codes, send DKIM-signed mail, and clean up. Built on the mailflat Python SDK.

Run

# zero-install, isolated (recommended)
MAILFLAT_API_KEY=mf_live_… uvx mailflat-mcp

# or install it
pipx install mailflat-mcp
MAILFLAT_API_KEY=mf_live_… mailflat-mcp

Claude Desktop / Cursor config

Add to claude_desktop_config.json (or your client's MCP config):

{
  "mcpServers": {
    "mailflat": {
      "command": "uvx",
      "args": ["mailflat-mcp"],
      "env": { "MAILFLAT_API_KEY": "mf_live_..." }
    }
  }
}

Get your API key from the MailFlat dashboard → Agents.

Tools (11)

Tool	What it does
`create_inbox(prefix?, label?, retention_hours?)`	Open a disposable inbox; `retention_hours` capped by your plan
`list_inboxes()`	All inboxes this key can see
`read_messages(address, direction="in")`	Read messages; received mail by default (`out` / `all` for the rest)
`wait_for_otp(address, timeout=30)`	Poll until an OTP arrives, then return it
`wait_for_message(address, timeout=30)`	Poll until a new message arrives; ignores mail you sent
`send_email(address, to, subject?, body?, html?)`	Send a DKIM-signed mail from the inbox
`reply(address, message_id, body?, html?)`	Answer a message in the same conversation (threading headers filled in)
`mark_read(address, message_id)`	Mark one message read so later polls skip it
`burn_inbox(address)`	Delete every message but KEEP the address
`delete_inbox(address)`	Delete the inbox and its messages
`delete_message(address, message_id)`	Delete one message; the inbox itself stays

Reads return received mail by default. Without that, sending to a peer and then waiting for the reply would immediately match your own outgoing message.

Configuration

MAILFLAT_API_KEY — your account API key (required).
MAILFLAT_API_URL — override the API base (default https://mailflat.net; for self-hosted / BYOD).

License

MIT

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