Clearout is an email verification company as they provide overall email verification accuracy of 88% on the valid, invalid, Gmail, Yahoo, AOL, and other types of emails.
It gives you the pace of choosing a plan according to your frequency of email validation, like for one time or based on a monthly subscription.
They have their own community where you can participate for healthy discussions or for tips, tutorials, etc. Even you'll be able to get quick answers to your questions. Isn't it amazing?
Further, they even provide phone number validation. It certainly helps you to get rid of useless phone numbers in your database. It saves lots of your time and even reduces your efforts while doing marketing through SMS. No such other email verification provides this type of service!
Clearout is the standard email verification though they lack a bit concerning accuracy. But overall, they are great in their services.