Mailsnail

Overview

Mailsnail is a Model Context Protocol server that lets you send USPS letters, postcards, and certified mail directly from any AI agent. There's no signup required — you pay per piece through Stripe, making it simple to integrate physical mail into your workflows.

The server runs locally via npx -y mailsnail and communicates with your MCP client over stdio. You'll need to set the MAIL_PROVIDER environment variable and provide an API key for authentication. The latest release is v0.6.0, available under the MIT license with source code at iancollins27/mailsnail on GitHub.

Mailsnail appears in the AI & Agents category on mcp.site and works with MCP clients including Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, and Zed. If you're the maintainer, claim this listing to verify your ownership, earn the Verified badge, and keep information up to date.

Installation

// claude_desktop_config.json
{
  "mcpServers": {
    "mailsnail": {
      "command": "npx",
      "args": [
        "-y",
        "mailsnail"
      ],
      "env": {
        "MAIL_PROVIDER": "<mail-provider>"
      }
    }
  }
}

Requires MAIL_PROVIDER