I have tried another email verifier. The redeem doesn't work right away. The site's contact us and about us page do not work. I can't trust it. I checked out a few more and I decided on BrandNav because the pricing is good, they have been in the business for a few years with properly dispalyed company information, and they reply to customers' questions and complaints! I have used the site to verified a few batches. It works well so far!