Email Verifier MCP Server — verify email addresses from Claude, Cursor or any agent

Give your AI assistant the ability to check whether an email address is real. This Actor is an MCP server: connect it once, and your agent can verify addresses mid-conversation — before it drafts outreach, enriches a CRM record, or hands you a lead list.

$0.30 per 1,000 addresses verified. No Verimailx account needed — you authenticate with your Apify token.

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What your agent can do

Tool	What it does
verify_email	Check one address. Returns a verdict, a 0–100 deliverability score, and every individual check.
verify_email_list	Check up to 25 addresses in one call. Returns per-address records plus a summary count by verdict.

Each check runs RFC syntax validation, DNS resolution, MX record inspection and an SMTP handshake, and flags disposable and role-based mailboxes. No mail is ever sent — the SMTP handshake asks the receiving server whether a mailbox exists and then disconnects, so nobody on your list is contacted.

Verdicts are valid (safe to send), invalid (will bounce), risky (disposable, role-based, or a catch-all domain) and unknown (server timeout or ambiguous response).

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Connect it

Claude Desktop / Claude Code

Add this to your MCP configuration, using an Apify API token:

{
  "mcpServers": {
    "verimailx": {
      "url": "https://cold-email-master--verimailx-email-mcp.apify.actor/mcp",
      "headers": {
        "Authorization": "Bearer <YOUR_APIFY_API_TOKEN>"
      }
    }
  }
}

Cursor, Windsurf, and other MCP clients

Same URL, same bearer token. The server speaks MCP over the Streamable HTTP transport.

The Actor runs in Standby mode, so an instance is kept warm and answers immediately — there is no run to start.

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What it looks like in use

You: Before I import these, are any of them going to bounce? founder@stripe.com, info@mailinator.com, nobody@thisdomaindoesnotexist.xyz

Claude: (calls verify_email_list) One of three is safe to send to. founder@stripe.com is valid, score 98. info@mailinator.com is risky — it's a disposable address and a role mailbox. nobody@thisdomaindoesnotexist.xyz is invalid; the domain has no MX records.

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Pricing

$0.30 per 1,000 addresses verified — billed per address, not per call or per run.

Volume	Cost
100 addresses	$0.03
1,000 addresses	$0.30
10,000 addresses	$3.00

Failed lookups are not charged. Apify's platform fee is included in the rate.

If you set a maximum charge for the run, the server checks the remaining budget before it verifies anything. Once the budget is spent it says so plainly — it will not keep verifying addresses it cannot bill you for, and a partial list call tells you exactly which addresses it left unverified.

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Verifying more than 25 at a time

This server is built for conversational use — an agent checking a handful of addresses inside a task. For list cleaning at scale, use the bulk Actor instead: Bulk Email Verifier & Validator. It takes a link to a CSV, an Apify dataset ID, or a pasted list, and handles tens of thousands of addresses per run at the same price.

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FAQ

Q: Do I need a Verimailx account? A: No. The Actor carries the Verimailx credentials; you authenticate with your Apify token and are billed through Apify.

Q: Does this send email to the addresses I check? A: No. Verification stops at the SMTP handshake. No message is delivered and the recipient sees nothing.

Q: How accurate is catch-all detection? A: Catch-all domains — ones configured to accept mail at any address — are reported as risky rather than valid, because an individual mailbox behind a catch-all cannot be confirmed. Treating them as valid is the most common cause of bounces on a "clean" list.

Q: What happens to the addresses I check? A: They are sent to the Verimailx API for verification and are not written to any persistent storage by this Actor.

Q: Can I use this without an AI agent? A: For scripted use the REST Actor is a better fit — MCP is designed for tool-calling clients.

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Support

• Issues with this Actor: open an issue on the Actor's Issues tab
• Bulk pricing (100k+ addresses): contact us through Apify messaging
• Verimailx API: verimailx.com

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Changelog

0.0.1 — Initial release

• verify_email and verify_email_list tools over Streamable HTTP, served through Actor Standby.
• Pay-per-event billing, charged per address verified.