MCP Tool

Email Verifier

Verify email deliverability and detect invalid addresses before outreach. Stop bouncing emails and protect your sender reputation.

Installation

npx @dropui/email-verifier

Configuration

Add to your claude_desktop_config.json:

{
  "mcpServers": {
    "email-verifier": {
      "command": "npx",
      "args": [
        "@dropui/email-verifier"
      ],
      "env": {
        "HUNTER_API_KEY": "your-hunter-api-key"
      }
    }
  }
}

Usage Examples

Verify single email

"Verify if john@example.com is a valid email address"

Check deliverability

"Can I send emails to sarah@company.co? Check if it will bounce"

Bulk verification

"Verify these emails and tell me which ones are valid: [list]"

Response Data

The tool returns verification results:

{
  "email": "john@example.com",
  "status": "valid",
  "score": 92,
  "deliverable": true,
  "disposable": false,
  "role_based": false,
  "free_provider": false,
  "mx_records": true,
  "smtp_check": true
}

Status Codes

validEmail is valid and deliverable

invalidEmail does not exist or will bounce

riskyMay be deliverable but has risks (catch-all, disposable)

unknownCould not verify (server timeout, etc.)

Best Practices

Verify emails before adding to outreach sequences
Re-verify old email lists before campaigns
Don't send to risky or unknown emails
Keep bounce rate under 2% to protect sender reputation

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