MailboxValidator

Overview

MailboxValidator is a Model Context Protocol (MCP) server: Email validation MCP server using the MailboxValidator API. It can validate email addresses. As an MCP server it plugs straight into AI assistants, exposing its functionality as tools the model can invoke on your behalf.

It runs locally: the npm package mcp-mailboxvalidator speaks MCP over stdio on your machine. Configuration happens through environment variables — you'll need MAILBOXVALIDATOR_API_KEY. The current release is v1.0.0, published under the MIT license, with source at MailboxValidator/mcp-mailboxvalidator on GitHub.

You'll find MailboxValidator in the Communication category here on mcp.site; it connects to Claude Desktop, Claude Code, Cursor, VS Code, Windsurf, Zed, and any other MCP client — see the install snippets below. If you maintain MailboxValidator for MailboxValidator, claim this listing to verify ownership, earn the Verified badge, and keep the details current.

Installation

// claude_desktop_config.json
{
  "mcpServers": {
    "mailboxvalidator": {
      "command": "npx",
      "args": [
        "-y",
        "mcp-mailboxvalidator"
      ],
      "env": {
        "MAILBOXVALIDATOR_API_KEY": "<mailboxvalidator-api-key>"
      }
    }
  }
}

Requires MAILBOXVALIDATOR_API_KEY