"It works amazingly well at validating email addresses with great API and support. It was able to identify about 10% of the invalid contacts in our database. There are other products for email verification but Clearout by far has the best price and easiest to use."

"After trying Clearout email tester, I almost never see any bounces or failed deliveries and our open rate is as high as 82% sometimes because the quality of our list is so good now. The "guaranteed deliverables" feature gives us a lot of confidence in Clearout as a product."