SuperMailOS MCP Server

by supermailos Your server? Claim it

answering

SuperMailOS is answering right now. Last checked 8 min ago.

Read, search, organize, draft and send business email from your SuperMailOS mailboxes.

Uptime history 62 hours of history · worst hour 75%

62 hours agonow

98.9%

Uptime 24h

182 of 184 checks

—

Tools

hidden behind auth

780 ms

Response time

average over 24h

OAuth sign-in

Access

streamable-http

SuperMailOS does not always answer

Over the last week it answered 99.3% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 8 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add mail --transport http https://supermailos.com/api/mcp

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

{
  "mcpServers": {
    "mail": {
      "url": "https://supermailos.com/api/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.mail]
url = "https://supermailos.com/api/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "mail": {
      "url": "https://supermailos.com/api/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "mail": {
      "url": "https://supermailos.com/api/mcp"
    }
  }
}

This endpoint answered with an authorization challenge. The server is running, and it signs you in through your browser: there is no API key to paste.

This server publishes 1 more address. The block above uses the one we reach during checks; the full list is under Endpoints below, and the author may intend a particular one for your client.

Endpoints

URL	Transport	State	Latency	Checked
https://supermailos.com/api/mcp	streamable-http	sign-in	795 ms	8 min ago
https://supermailos.com/mcp	streamable-http	sign-in	821 ms	8 min ago

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SuperMailOS — questions

Answers built from our own checks of this server.

Why is there no tool list for SuperMailOS?

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: 98.9% of checks in the last 24 hours got a reply.

Is SuperMailOS working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 182 of 184 checks got a reply (98.9%), average response time 780 ms. The bar chart above shows every period we have measured.

How do I connect SuperMailOS?

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 sign in through your browser once and the client keeps the session: no key to copy, and it refuses anonymous clients.

How do you sign in to SuperMailOS?

No API key is involved. SuperMailOS answers our knock with an OAuth challenge, so you authorise it once in your browser and the client keeps the session. That is also why we see no tool list: it will not describe itself to an anonymous client, and that is the server working as intended, not a fault.

How fast is SuperMailOS?

It answers our handshake in 780 ms on average, which is faster than 11% of all working MCP servers we measure. That is on the slow side — worth knowing if the tool sits inside an interactive loop. The comparison comes from our own checks across the whole registry, every 15 minutes.