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CheckMX

Official registry Productivity

Verify emails and review cold email campaigns, mailboxes, replies and deliverability in CheckMX.

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 checkmx 'https://checkmx.dev/mcp'
JSON configuration (Claude Desktop, Cursor, VS Code) 
{
    "mcpServers": {
        "checkmx": {
            "type": "http",
            "url": "https://checkmx.dev/mcp"
        }
    }
}

Frequently asked questions

What is CheckMX?

Verify emails and review cold email campaigns, mailboxes, replies and deliverability in CheckMX.

How do I install CheckMX?

It runs as a remote server. In Claude Code: claude mcp add --transport http checkmx 'https://checkmx.dev/mcp'. For other clients, paste the JSON configuration from this page into their MCP settings.

Does CheckMX need an API key?

Its registry entry lists no required key or secret. Some features may still need an account with the service it connects to.

Who maintains CheckMX?

It is published by dev.checkmx. 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.