Mailbox Mcp

Please install the `mailbox-mcp` MCP server into my current AI client (that's you).

Required prerequisites (do these first if not already done):
- **Node.js and npm** — Install Node.js and npm to run the server via npx. (https://nodejs.org/)

Optional prerequisites:
- Google OAuth credentials for Gmail accounts — If you want to use Gmail, create a Google Cloud project, enable the Gmail API, configure the OAuth consent screen, create Desktop app OAuth credentials, and save the downloaded JSON as ~/.mailbox-mcp/oauth-keys.json. (https://console.cloud.google.com/)
- Encryption passphrase for IMAP/JMAP accounts — Choose a long random passphrase for MAILBOX_MCP_PASSPHRASE. It is required before adding IMAP or JMAP accounts and is used to encrypt credentials at rest.

Canonical MCP server config (stdio transport):
- command: `npx`
- args: ["-y","mailbox-mcp"]
- optional environment variables:
  - `MAILBOX_MCP_PASSPHRASE`: Passphrase used to encrypt IMAP/JMAP credentials at rest. Required if you will add IMAP or JMAP accounts; unused for Gmail-only setups. (example: `<your-long-random-passphrase>`)

Note: After starting the server, accounts are added interactively through the MCP tools such as authenticate. For Gmail, OAuth keys must be saved at ~/.mailbox-mcp/oauth-keys.json before authenticating. Tokens are stored locally under ~/.mailbox-mcp/accounts/.

Add this MCP server to my current client's config in the correct format for you. If you need secrets or credentials I haven't provided, ASK me — do not invent values or leave raw placeholders. After adding it, tell me how to verify the server is connected.