Like any similar database, Lead Finder has a percentage of non-valid emails. This percentage varies depending on the filters you apply.
We use a variety of validation methods to determine if the email exists on LinkedIn. Quite often those methods give completely different results, so the only way to tell if the email is valid is to send a connection request on this email.
We are constantly working on improving the accuracy of our database. The cost of the contact's data in our app is one of the lowest on the market, but the quality is on par with other products.
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