Lettio MCP Server

by lettio Your server? Claim it

answering

Lettio MCP is answering right now. Last checked 3 min ago. 59 installs a week from npm. Last commit 2 Nov 2026.

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

Installs per day peak 12 · avg 4 · +883% w/w

a month agotoday

Uptime history 48 days of history · worst day 93%

48 days agonow

100.0%

Uptime 24h

92 of 92 checks

—

Tools

hidden behind auth

281 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 3 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

Settings → Connectors → Add custom connector, then paste this address

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

{
  "servers": {
    "mcp": {
      "type": "http",
      "url": "https://mcp.lettio.eu/mcp"
    }
  }
}

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	261 ms	3 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 92 of 92 checks got a reply (100.0%), average response time 281 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 in the form 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 281 ms on average, which is faster than 51% 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 59 times in the last week. Week over week that is +883%. 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?

The code is open source: it is published under the MIT licence, written in TypeScript and 0 stars on GitHub. The licence covers the code in the repository, not the hosted service at mcp.lettio.eu, which runs on its operator's own terms.