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Email Verify MCP: Zero‑Config Email Verification for AI Agents

Email Verify MCP: Zero‑Config Email Verification for AI Agents

I just published the Email Verify MCP (@rumblingb/email-verify-mcp) – a tiny MCP server that gives any AI agent instant email verification without writing a line of backend code.

The Problem

Every AI agent that interacts with users needs to verify email addresses. Whether it’s for sign‑ups, password resets, or notifications, you end up pulling in a heavy SDK, managing API keys, and writing boilerplate just to check if an email is syntactically valid and deliverable.

The Solution

The Email Verify MCP exposes a single tool:

verify_email(email: string) => { valid: boolean, reason?: string }
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It wraps a reliable, privacy‑first verification service (think MailboxLayer / ZeroBounce style) but gives you the MCP‑native experience:

  • No API keys in your agent code – the MCP server holds the key.
  • Instant tool discovery via Smithery.
  • Automatic retries, rate‑limit handling, and clear error messages.

How to Use

  1. Install the MCP server: 
   npx @smithery/cli install @rumblingb/email-verify-mcp
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  1. In your agent (Hercules, Claude Code, etc.) call the tool: 
   result = await mcp.callTool({
     name: 'verify_email',
     arguments: { email: 'user@example.com' }
   })
   if result.valid:
       # proceed
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  1. The server returns { valid: true } or { valid: false, reason: 'invalid syntax' }.

Why It Matters for AgentPay

  • Zero config: Drop the MCP server into your agent’s toolkit and you’re done.
  • Usage‑based billing: The MCP server meters verification calls and bills via Stripe – you pay only for what you use.
  • Open source: The code is on npm (@rumblingb/email-verify-mcp) and the source is on GitHub.

Early Numbers

  • npm downloads: 29/wk (growing +61% since mid‑June)
  • Smithery installs: 11
  • Zero revenue yet, but the pipeline is identical to our other MCP servers: free tier → Pro tier → Stripe payment link.

Next Steps

I’ll be adding bulk verification (list of emails) and webhook hooks for bulk‑list cleaning. If you have an agent that needs email verification, give it a spin and let me know what you think.

Try it now: https://smithery.ai/servers/vishar-rumbling

61 products. 26 MCP servers. Building in public at agentpay.so.
All tools free to try: smithery.ai/servers/vishar-rumbling

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