Email Validation,
Stamped with Confidence.

Stop bounces before they happen.
The developer-first API for real-time email verification.

Free to start. No credit card required.

Built for Developers

A simple API for validating emails in real time.
Integrate in minutes and start verifying addresses instantly.

  • Predictable JSON responses
  • Async / Await support
  • SDKs for Node.js and Python
  • Built for production workloads
View full API documentation

import stamp from 'stamp-api';

const result = await stamp.validate({

email: 'user@example.com'

});

// Returns { status: 'valid', score: 0.98 }

Disposable Email Detection

Remove disposable email addresses used for spamming and abuse. Keep your database clean by preventing throwaway addresses from signups or form submissions.

  • Block disposable mailboxes
  • Detect temporary services
  • Prevent fake signups
  • Maintain list quality

Real-time Email Verification

Validate email addresses on the fly as they are submitted. Identify invalid inboxes and stop undelivered mail and protect your sender reputation in real-time.

  • Check MX records
  • Perform SMTP handshake
  • Prevent future bounces
  • Protect sender reputation

Supporting Features

Syntax Validation

Ensure email addresses follow the correct format before deeper checks.

Bulk Email Validation

Validate large email lists efficiently at scale.

Greylist Monitoring

Detect temporary mail server deferrals and retry intelligently.