maildev

by maildev · Developer Tools · ★ 6,148

maildev is an MCP server by maildev. :mailbox: SMTP Server + Web Interface for viewing and testing emails during development. It has 6,148 GitHub stars and ranks #43 of 2217 in Developer Tools by stars.

Category: Developer Tools
Author: maildev
GitHub stars: 6,148
This week: Tracking since 18 Oct 2026
Weekly downloads: 3,291
Language: TypeScript
License: MIT (open source)
Last update: 2026-09-24 (30 days ago)
Links: Source Website npm

maildev
smtp
nodemailer
docker
smtp-server
mailcatcher
testing
development
developer-tools
nodejs

How to install maildev

maildev is published on npm as @maildev/mcp, and it depends on @modelcontextprotocol/sdk. These steps assume it runs as a local stdio server, which is the usual setup.

Check the README. Confirm the start command and note any API keys or environment variables it needs (pass them with -e KEY=value or an env block). You need Node.js for npx.

Add it to Claude Code from a terminal:

claude mcp add maildev -- npx -y @maildev/mcp

Or add it to Cursor or Claude Desktop in .cursor/mcp.json or claude_desktop_config.json:

{
  "mcpServers": {
    "maildev": {
      "command": "npx",
      "args": [
        "-y",
        "@maildev/mcp"
      ]
    }
  }
}

Restart the client and check it. Run claude mcp list, or open the client's MCP settings, and confirm maildev and its tools are listed. The install guide covers VS Code and Codex.

Also listed in

MCP servers for Docker338

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Frequently asked questions

What is maildev?

maildev is an MCP server by maildev in the Developer Tools category. :mailbox: SMTP Server + Web Interface for viewing and testing emails during development. It has 6,148 GitHub stars and ranks #43 of 2217 in Developer Tools by stars. It is written in TypeScript. It is licensed under MIT. It was last updated 30 days ago.

Is maildev free and open source?

Yes. maildev is published under the MIT license, so you can run, modify and self-host it at no cost. If it connects to a paid service, that service's own pricing and API terms still apply. Check the repository for the exact license text before using it commercially.

What are the alternatives to maildev?

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Data last updated 25 October 2026. Stars and downloads are refreshed every day from GitHub and npm.