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mcp/harbor
Claude Desktop

mailsnail for Claude Desktop

io.github.iancollins27/mailsnail

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

client:Claude Desktop transport:stdio runtime:npm

Install mailsnail in Claude Desktop

~/Library/Application Support/Claude/claude_desktop_config.json · windows: %APPDATA%\Claude\claude_desktop_config.json

Held in this page only — never stored, logged, or sent anywhere but back to your screen. 

{
  "mcpServers": {
    "mailsnail": {
      "command": "npx",
      "args": [
        "-y",
        "mailsnail"
      ],
      "env": {
        "MAIL_PROVIDER": "<MAIL_PROVIDER>",
        "MAIL_API_BASE_URL": "<MAIL_API_BASE_URL>",
        "CLICK2MAIL_USERNAME": "<CLICK2MAIL_USERNAME>",
        "CLICK2MAIL_PASSWORD": "<CLICK2MAIL_PASSWORD>",
        "LOB_API_KEY": "<LOB_API_KEY>",
        "MAIL_MCP_ALLOW_LIVE": "<MAIL_MCP_ALLOW_LIVE>",
        "MAIL_MCP_SPEND_CAP_USD": "<MAIL_MCP_SPEND_CAP_USD>"
      }
    }
  }
}

Settings → Developer → Edit Config opens this file. Restart the app after saving. Claude Desktop docs

mailsnail in other clients

mailsnail MCP server