The Email Checker MCP Server validates email addresses for cold outbound email campaigns.
Verify if an email address exists (returns "true" or "false")
Uses the 2ip.me API without requiring an API key
Handles various errors including invalid formats, API failures, network timeouts, and rate limiting
Configurable as an MCP server for integration with Claude desktop
Can run validation through FastMCP tool with async functionality
Email Checker MCP Server
For your cold outbound email, this tool will help you validate email addresses.
Features
Email address validation
Simple JSON response format
No API key required
Related MCP server: MCP-Email-Verify
Prerequisites
Python 3.x
Installation
Clone the repository:
Install dependencies using uv:
Note: We use uv instead of pip since the project uses pyproject.toml for dependency management.
Configure as MCP Server
To add this tool as an MCP server, you'll need to modify your Claude desktop configuration file.
The configuration file location depends on your operating system:
MacOS:
~/Library/Application\ Support/Claude/claude_desktop_config.jsonWindows:
%APPDATA%/Claude/claude_desktop_config.json
Add the following configuration to your JSON file:
⚠️ IMPORTANT:
Replace
YOUR_USERNAMEwith your actual system usernameMake sure the directory path matches your local installation
Usage
The service provides a FastMCP tool for validating email addresses:
Example Use:
Prompt: Does this email exist?
Parameters:
email: String containing the email address to validate
Example Response:
API Usage Limits
The service uses 2IP's Email API which provides:
No API key required
Error Handling
The service includes error handling for:
Invalid email format
API request failures
Network timeouts
Rate limiting