Postio MCP Server: Install & Setup

Install Postio in Claude Code

Claude Code

claude mcp add postio-uk-address-postcode-email-phone-v -e POSTIO_API_KEY=... -- npx -y @postio/mcp

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

{
  "mcpServers": {
    "postio-uk-address-postcode-email-phone-v": {
      "command": "npx",
      "args": [
        "-y",
        "@postio/mcp"
      ],
      "env": {
        "POSTIO_API_KEY": "..."
      }
    }
  }
}

Replace each ... with your own value.

Frequently asked questions

What does the Postio MCP server do?

Validate UK addresses, postcodes, emails and phone numbers — Royal Mail PAF, live SMTP and HLR.

Is the Postio MCP server free?

The server is free, but you will likely need an account. The server itself is free, but it connects to a service that needs an account or API key, which may have paid tiers. Check the provider for current pricing.

Does Postio run locally or remotely?

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

How do I add Postio to Claude Code?

Run: claude mcp add postio-uk-address-postcode-email-phone-v -e POSTIO_API_KEY=... -- npx -y @postio/mcp

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