Mailgun

Mailgun is a leading email verification and validation service provider. They offer a range of tools and APIs designed to improve email deliverability and enhance the quality of email lists. With a robust infrastructure that handles over 340 billion emails annually, Mailgun ensures reliable and secure email communications. Their Email Verification tool utilizes real-time, three-step validation checks based on billions of sent emails. It helps users filter out bad email addresses and separate quality subscribers. Mailgun's services are widely used by individuals, businesses, and organizations that rely on email communications for marketing, customer engagement, and other purposes.

https://www.mailgun.com/