Lettio MCP Server

by lettio Your server? Claim it

answering

Lettio MCP is answering right now. Last checked 7 min ago. 60 installs a week from npm. Last commit 16 Sep 2026.

Private, EU-hosted email for AI agents over JMAP: read, search, reply, organize, send.

Installs per day peak 60 · avg 2

a month agotoday

Uptime history 67 hours of history

67 hours agonow

100.0%

Uptime 24h

91 of 91 checks

—

Tools

hidden behind auth

217 ms

Response time

average over 24h

Installs / week

npm and PyPI

Nothing serious here today

Today is the operative word: we check Lettio MCP every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 7 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

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

~/Library/Application Support/Claude/claude_desktop_config.json

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

~/.codex/config.toml

[mcp_servers.mcp]
url = "https://mcp.lettio.eu/mcp"

.cursor/mcp.json

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

.vscode/mcp.json

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

This one needs environment variables set before it will start: LETTIO_USERNAME (Full email address of the Lettio mailbox, e.g. [email protected].), LETTIO_PASSWORD (App password for the mailbox.), LETTIO_HOST (Mail host. Defaults to https://mail.lettio.eu.). The author declared them in the registry entry; get the values from the project itself.

This endpoint answered with an authorization challenge. The server is running, but you need an API key from its owner to call it.

Endpoints

URL	Transport	State	Latency	Checked
https://mcp.lettio.eu/mcp	streamable-http	needs key	307 ms	7 min ago

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Lettio MCP — questions

Answers built from our own checks of this server.

Why is there no tool list for Lettio MCP?

The server answered our handshake with an authorization challenge, so it is running — but it will not describe its tools to an anonymous client. To see them you need to connect with your own credentials. We record it as alive, not as broken: 100.0% of checks in the last 24 hours got a reply.

Is Lettio MCP working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 91 of 91 checks got a reply (100.0%), average response time 217 ms. The bar chart above shows every period we have measured.

How do I connect Lettio MCP?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address. You will need your own key: it refuses anonymous clients.

Does Lettio MCP need an API key?

Yes. Every time we knock, Lettio MCP answers with an authorization challenge instead of its tool list — that is how we know it is running and gated rather than broken. Bring your own credentials and it will talk.

How fast is Lettio MCP?

It answers our handshake in 217 ms on average, which is faster than 63% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

How many people use Lettio MCP?

The npm package @lettio/mcp was installed 60 times in the last week. We show installs rather than GitHub stars on purpose: a star is a bookmark, an install is someone actually running it.

Is Lettio MCP open source?

Yes — it is published under the MIT licence, written in TypeScript and 0 stars on GitHub. The source link is on this page, so you can read exactly what it does with your data before you connect it.