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MailFathom MCP Server

by krzysztof318 Your server? Claim it
not responding

MailFathom is listed as active in the registry but did not answer our last check. Last commit 22 Sep 2026.

Security-first, self-hosted email archive with search, cited answers, and sending for AI agents.

Uptime history 39 days of history · worst day 0%
39 days agonow
0.0%
Uptime 24h
0 of 90 checks
Tools
hidden behind auth
0 ms
Response time
average over 24h
14
Stars
last commit 22 Sep 2026

What the code does

We read the source, 8 h ago · rules 3dff92dd89df

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

            using var browser = Process.Start(new ProcessStartInfo(address.AbsoluteUri) { UseShellExecute = true });
    [GeneratedRegex(@"(?:https?://)?hooks.slack.com/(?:services|workflows|triggers)/[A-Za-z0-9+/]{43,56}", SecretRegexEngine.MatchOptions, SecretRegexEngine.MatchTimeoutMilliseconds)]
In the project's build, not in the package

Found in continuous integration, deployment or infrastructure files, or in a neighbouring package of the same monorepo. None of this is installed when you add the server: it describes how the project is built and released. We list it because a leaked key in a build pipeline is still a real problem, but it is not something this server does on your machine.

Builds a database query by concatenation .github/workflows/release.yml:361
      - name: Create or update the release from the changelog
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
COPY frontend/package.json frontend/pnpm-lock.yaml frontend/pnpm-workspace.yaml frontend/.npmrc frontend/

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

This code can reach further than it looks

We found places where it runs commands, builds paths or queries from values it is given. None of that is a flaw by itself — it becomes one when the code changes, and code changes quietly between releases. We re-read it on every one.

Three servers free · no card

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 13 min ago.

run in your terminal
claude mcp add mailfathom --transport http https://{mailfathom_host}/mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "mailfathom": {
      "url": "https://{mailfathom_host}/mcp"
    }
  }
}
~/.codex/config.toml
[mcp_servers.mailfathom]
url = "https://{mailfathom_host}/mcp"
.cursor/mcp.json
{
  "mcpServers": {
    "mailfathom": {
      "url": "https://{mailfathom_host}/mcp"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "mailfathom": {
      "url": "https://{mailfathom_host}/mcp"
    }
  }
}

Endpoints

URLTransportStateLatencyChecked
https://{mailfathom_host}/mcp streamable-http answering 0 ms 13 min ago

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MailFathom — questions

Answers built from our own checks of this server.

Is MailFathom working right now?
We send a real MCP handshake every 15 minutes. Over the last 24 hours 0 of 90 checks got a reply (0.0%), average response time 0 ms. The bar chart above shows every period we have measured.
The registry lists MailFathom as active — why does it not respond?
The official MCP registry stores what the author submitted; it does not verify that the server still runs. We check the endpoint ourselves, and this one does not answer. Catalogues that copy the registry without checking will show it as working.
How do I connect MailFathom?
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.
Does MailFathom need an API key?
No. MailFathom completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. This is what we observed, not what the docs claim.
Is MailFathom open source?
Yes — it is published under the AGPL-3.0 licence, written in C#, 14 stars on GitHub and 183 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.