Lettio MCP Server: Install & Setup

Install Lettio in Claude Code

Remote URL

Claude Code

claude mcp add --transport http lettio https://mcp.lettio.eu/mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "lettio": {
      "url": "https://mcp.lettio.eu/mcp"
    }
  }
}

npm

Claude Code

claude mcp add lettio -e LETTIO_USERNAME=... -e LETTIO_PASSWORD=... -- npx -y @lettio/mcp

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "lettio": {
      "command": "npx",
      "args": [
        "-y",
        "@lettio/mcp"
      ],
      "env": {
        "LETTIO_USERNAME": "...",
        "LETTIO_PASSWORD": "..."
      }
    }
  }
}

Replace each ... with your own value.

Frequently asked questions

What does the Lettio MCP server do?

Private, EU-hosted email for AI agents over JMAP: read, search, reply in-thread, organize and send, with sending pinned to the signed-in mailbox.

Is the Lettio MCP server free?

The server is free, but you will likely need an account. The server itself is free, but it connects to a service that needs an account or API key, which may have paid tiers. Check the provider for current pricing.

Does Lettio run locally or remotely?

Local + Remote. Can run locally or be used as a hosted remote server.

How do I add Lettio to Claude Code?

Run: claude mcp add --transport http lettio https://mcp.lettio.eu/mcp

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