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Claude Desktop

Postio — UK Address, Postcode, Email & Phone Validation for Claude Desktop

uk.co.postio/postcode-address-validation

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

client:Claude Desktop transport:stdio runtime:npm

Install Postio — UK Address, Postcode, Email & Phone Validation 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": {
    "postcode-address-validation": {
      "command": "npx",
      "args": [
        "-y",
        "@postio/mcp"
      ],
      "env": {
        "POSTIO_API_KEY": "<POSTIO_API_KEY>",
        "POSTIO_BASE_URL": "<POSTIO_BASE_URL>"
      }
    }
  }
}

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

Postio — UK Address, Postcode, Email & Phone Validation in other clients

Postio — UK Address, Postcode, Email & Phone Validation MCP server