This free tool will verify all your email lists in seconds and will allow you to download a report with all invalid emails. Easy, fast and secure!
You can check all email addresses from your mailing lists, Windows Address Book, Microsoft Outlook Contacts and external databases- csv or xls formats
This tool reduces the possibility of sending out newsletters or messages to non-existent email addresses; resulting in improved marketing campaigns and customer relationship management, minimizing the chances of being flagged as a spammer, avoiding blacklists and saving your organization time and resources.
Have a look here: https://www.whoisextractor.in/validate-email-address/