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Swarmail MCP Server

local only

Swarmail runs on your own machine — the client starts it, so there is no endpoint to ping. 758 installs a week from npm. Last commit 12 Oct 2026.

Local mail between coding-agent sessions on one machine; relays to a running Swarmail server.

Installs per day peak 169 · avg 6
a month agotoday
758
Installs / week
npm · swarmail-mcp
1
Stars
0 open issues
12 Oct 2026
Last commit
4 releases in 90 days
MIT
License
JavaScript

What the code does

We read the source, 10 h ago · rules ccca72095570

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.

      ? /^\*\*\* (?:Add|Update|Delete) File: (.+)$/m.exec(args.command)?.[1]

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

Nothing serious here today

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

Three servers free · no card

Connect this server

This server runs on your own machine — install it with the package manager and the client starts it for you. Package name taken from the official registry entry.

run in your terminal
claude mcp add swarmail -- npx -y swarmail-mcp
~/Library/Application Support/Claude/claude_desktop_config.json
{
  "mcpServers": {
    "swarmail": {
      "args": [
        "-y",
        "swarmail-mcp"
      ],
      "command": "npx"
    }
  }
}
~/.codex/config.toml
[mcp_servers.swarmail]
command = "npx"
args = ["-y", "swarmail-mcp"]
.cursor/mcp.json
{
  "mcpServers": {
    "swarmail": {
      "args": [
        "-y",
        "swarmail-mcp"
      ],
      "command": "npx"
    }
  }
}
.vscode/mcp.json
{
  "mcpServers": {
    "swarmail": {
      "args": [
        "-y",
        "swarmail-mcp"
      ],
      "command": "npx"
    }
  }
}

This one needs environment variables set before it will start: SWARMAIL_URL (MCP endpoint of the running Swarmail server). The author declared them in the registry entry; get the values from the project itself.

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Swarmail — questions

Answers built from our own checks of this server.

Why is there no uptime for Swarmail?
Swarmail runs on your own machine over stdio — there is no network address to reach, so uptime cannot be measured for it by anyone. What can be measured is adoption: the npm package swarmail-mcp was installed 758 times last week.
How do I connect Swarmail?
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 runs locally, so the command pulls swarmail-mcp straight from npm; nothing to host, nothing to sign up for.
How many people use Swarmail?
The npm package swarmail-mcp was installed 758 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 Swarmail open source?
Yes — it is published under the MIT licence, written in JavaScript and 1 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.