Confidence Score is basically an indicator of validity of the sources of the found/verified email(s). The bigger the Confidence Score is, the more accurate the results are. For each found or verified email, you’ll be able to see the Confidence Score and it will tell you whether the email is authentic and whether you should use it or not.
Here’s a brief description:
95 –100% Confidence Score means that we found the email address from a very reliable source(s) – And you can send the email with 100% confidence that it will be delivered to the right person
85% Confidence Score represents slightly risky source(s) – It means we have found the email but we’re not too confident about the email’s authenticity
70% Confidence Score has risky sources and that means that we have found the email address, but we’re not confident whether it’s authentic. It also means that we consider sending the email to it risky, since we cannot guarantee it represents the right person.