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Install MX Probe

For an AI agent that sets up MCP servers (Cline and the like). The server needs no clone and no build: it runs from npm over stdio, and the free DNS tier needs no key.

Add this to the MCP settings file (Cline: cline_mcp_settings.json):

{
  "mcpServers": {
    "mxprobe": {
      "command": "npx",
      "args": ["-y", "mxprobe", "mcp"],
      "disabled": false,
      "autoApprove": []
    }
  }
}

Node 20 or newer is the only requirement. npx fetches the mxprobe package on the first start.

Check it

Call verify_email on an address. The answer is send, hold or kill with the reason. Without a key the tools run the DNS tier on this machine.

Tools

Tool What
verify_email One address: send, hold or kill, with the reason.
verify_batch Up to 500 addresses in one call.
signup Make a hosted key with 100 free checks.
balance The credits left on the key.
buy_credits A Stripe link: 9 USD per 10,000 checks.

The hosted tier (optional)

signup takes the operator's email address, creates the key and writes it to ~/.config/mxprobe/config.json. The verify tools then probe the mailbox over SMTP, and a DNS kill stays local. You can also put the key in the env block above as MXPROBE_API_KEY.

Docs: https://mxprobe.dev. For agents: https://mxprobe.dev/llms.txt.