Mailsnail MCP Server: Install & Setup

Install Mailsnail in Claude Code

Claude Code

claude mcp add mailsnail -e MAIL_PROVIDER=... -- npx -y mailsnail

mcp.json (Claude Desktop, Cursor, VS Code, Windsurf)

{
  "mcpServers": {
    "mailsnail": {
      "command": "npx",
      "args": [
        "-y",
        "mailsnail"
      ],
      "env": {
        "MAIL_PROVIDER": "..."
      }
    }
  }
}

Replace each ... with your own value.

Frequently asked questions

What does the Mailsnail MCP server do?

Send USPS letters, postcards & certified mail from any agent. No signup; pay-per-piece via Stripe.

Is the Mailsnail MCP server free?

Yes, most likely. Open source and no paid account or API key is mentioned in the listing. Check the provider for current pricing.

Does Mailsnail run locally or remotely?

Local. Runs on your machine (stdio). You install it with npx, uvx, Docker or from source.

How do I add Mailsnail to Claude Code?

Run: claude mcp add mailsnail -e MAIL_PROVIDER=... -- npx -y mailsnail

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