This is the best one I've found, let me know if y'all prefer something else. Happy hunting!
Best email checking/verification site
https://gsuite.tools/verify-email Email Checker - Verify if an email address is valid with 95%+ accuracy
Verify email addresses the easy way with this fast, reliable, clean online SMTP tester. Check the status of a remote e-mail address without sending any message and debug it right away!
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