Email Verification — Real-Time Deliverability Check

Email verification API for AI agents.

CommunityRequires local installNo sign-inGlobalFreeCan modify data
This server only runs on your computer. It cannot be added to Claude or ChatGPT web. See the project docs for installation.

What it can do

    What data it sees

    Do you need an account

    No: the server works without sign-in

    Email verification API for AI agents. Validate any email address in real-time with syntax check, MX record validation, disposable provider detection (Mailinator, Guerrilla Mail, 100+ providers), role-based flags (admin@, info@), and composite quality score 0-100.

    Tools: email_verify_address (single), email_verify_batch (up to 100 emails).

    Use this BEFORE sending outreach emails, adding contacts to CRM, or processing signups. Essential for cleaning email lists, detecting fake registrations, and qualifying leads. Drop-in replacement for Hunter.io email verification at 15x lower cost.

    Returns: {valid, syntax, mx, disposable, role, free, score, email}. No API key required — x402 micropayment $0.002/call on Base L2.

    Requires a local install: run the server on your machine, then point your client at it.

    How to connect

    How to connect Email Verification — Real-Time Deliverability Check to Claude

    1. Open Claude (claude.ai or the desktop app).
    2. Go to Settings → Connectors.
    3. Click Add custom connector.
    4. Paste the server address copied below into Remote MCP server URL and click Add.
    5. In a chat, click + → Connectors and switch the new connector on.

    Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

    Authorization

    After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

    This server runs locally: it is wired up through the client config, and the project documentation carries the steps.

    How to connect Email Verification — Real-Time Deliverability Check to ChatGPT

    1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
    2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
    3. Open Settings → Connectors and click Create.
    4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
    5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
    6. In a new chat open + → Apps/Connectors and enable the connector.

    OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

    Authorization

    On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

    This server runs locally: it is wired up through the client config, and the project documentation carries the steps.

    How to connect Email Verification — Real-Time Deliverability Check to Cursor

    Fastest: click Open in Cursor below and confirm the prompt.

    Manually:

    1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
    2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
    3. Save the file. The server appears in the MCP list; authorize it there if asked.

    Authorization

    If the service needs sign-in, an authorize button appears next to the server in the MCP list.

    This server runs locally: it is wired up through the client config, and the project documentation carries the steps.

    Tools not fetched yet: the server requires sign-in; the list appears after a manual check.