This task can be performed using Email Checker
Fast, Accurate Email Verification API that wont break your account.
Best product for this task

Email Checker
dev-tools
Email Checker is a smart, high‐accuracy email validation tool that evaluates addresses in real time (or in bulk) using syntax, domain, and mailbox verification. It flags invalid, risky, and disposable emails—helping marketers and developers reduce bounce rates, protect sender reputation, and improve deliverability. With simple API integration and transparent pricing, it’s ideal for any email-driven workflow. TRY: chkfa.st/[email protected]

What to expect from an ideal product
- Validates email addresses in real-time before sending campaigns to catch invalid addresses that cause bounces
- Identifies risky and disposable email addresses that hurt your sender reputation when they bounce or get marked as spam
- Uses three-layer verification checking syntax, domain validity, and actual mailbox existence to ensure emails will reach their destination
- Processes email lists in bulk to clean your entire database and remove addresses that damage deliverability rates
- Integrates directly into your email workflow through API so bad addresses get filtered out automatically before campaigns go live

