Email Validator MCP server

This Email Checker MCP Server helps validate email addresses for your cold outbound campaigns, providing simple verification through a Claude integration with no API key required.

Installation

Prerequisites

• Python 3.x

Setup Steps

1. Clone the repository:

   git clone https://github.com/ravinahp/email-checker-mcp.git
   cd email-checker-mcp
   

2. Install dependencies using uv:

   uv sync
   

Configuration

To integrate this tool with Claude desktop, you'll need to modify your Claude configuration file.

Configuration File Location

• MacOS: ~/Library/Application\ Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%/Claude/claude_desktop_config.json

Adding the MCP Server

Add the following configuration to your JSON file:

{
    "email-checker-mcp": {
        "command": "uv",
        "args": [
            "--directory",
            "/Users/YOUR_USERNAME/Code/email-checker-mcp",
            "run",
            "email-checker-mcp"
        ]
    }
}

Important notes:

• Replace YOUR_USERNAME with your actual system username
• Ensure the directory path matches your local installation

Using the Email Validator

The service provides a FastMCP tool for validating email addresses:

@mcp.tool()
async def validate_email(email: str) -> bool:
    """Validate if an email address exists."""

Parameters

• email: String containing the email address to validate

Example Response

{
    "exist": true
}

Usage Example

You can ask Claude to check if an email exists, and Claude will use the MCP server to validate it.

Service Limits

The service uses 2IP's Email API which:

• Requires no API key
• Has built-in error handling for:
  • Invalid email format
  • API request failures
  • Network timeouts
  • Rate limiting

How to install this MCP server

For Claude Code

To add this MCP server to Claude Code, run this command in your terminal:

claude mcp add-json "email-checker-mcp" '{"command":"uv","args":["--directory","/Users/YOUR_USERNAME/Code/email-checker-mcp","run","email-checker-mcp"]}'

See the official Claude Code MCP documentation for more details.

For Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > Tools & Integrations and click "New MCP Server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "email-checker-mcp": {
            "command": "uv",
            "args": [
                "--directory",
                "/Users/YOUR_USERNAME/Code/email-checker-mcp",
                "run",
                "email-checker-mcp"
            ]
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explicitly ask the agent to use the tool by mentioning the tool name and describing what the function does.

For Claude Desktop

To add this MCP server to Claude Desktop:

1. Find your configuration file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json
• Linux: ~/.config/Claude/claude_desktop_config.json

2. Add this to your configuration file:

{
    "mcpServers": {
        "email-checker-mcp": {
            "command": "uv",
            "args": [
                "--directory",
                "/Users/YOUR_USERNAME/Code/email-checker-mcp",
                "run",
                "email-checker-mcp"
            ]
        }
    }
}

3. Restart Claude Desktop for the changes to take effect