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MailTester Ninja

Official registry Productivity

Verify email addresses live against their mail server and find work emails. Nothing stored.

Website

Install

Add this to your client's MCP configuration (Claude Desktop: claude_desktop_config.json; Cursor: .cursor/mcp.json; VS Code and others use the same "mcpServers" shape).

Remote (streamable-http)
Claude Code 
claude mcp add --transport http mailtester-ninja 'https://mcp.mailtester.ninja/mcp' --header 'X-API-Key: <Your MailTester Ninja key: a free API token from https://mailtester.ninja/free-email-verification-api/ (50 checks a day) or a paid key.>'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "mailtester-ninja": {
            "type": "http",
            "url": "https://mcp.mailtester.ninja/mcp",
            "headers": {
                "X-API-Key": "<Your MailTester Ninja key: a free API token from https://mailtester.ninja/free-email-verification-api/ (50 checks a day) or a paid key.>"
            }
        }
    }
}

Frequently asked questions

What is MailTester Ninja?

Verify email addresses live against their mail server and find work emails. Nothing stored.

How do I install MailTester Ninja?

It runs as a remote server. In Claude Code: claude mcp add --transport http mailtester-ninja 'https://mcp.mailtester.ninja/mcp' --header 'X-API-Key: <Your MailTester Ninja key: a free API token from https://mailtester.ninja/free-email-verification-api/ (50 checks a day) or a paid key.>'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does MailTester Ninja need an API key?

Yes. It expects X-API-Key, which you set in its configuration.

Who maintains MailTester Ninja?

It is published by ninja.mailtester. AI.tn lists it but does not maintain or endorse it.

From the official MCP Registry. Listing is not an endorsement: review a server's code and permissions before giving it access to your data.