Our Email Finder neither stores nor provides emails from a database, as this would be illegal and violate GDPR. What our Email Finder does is guess emails based on a member's name and surname, as well as the company's name or domain name. Subsequently, since there are various possible formats for an email address, they are tested one by one and then verified. When verified, the deliverability guarantee is 98%.
A rate of 50% to 70% is entirely normal because not all LinkedIn members provide their company's name. For instance, freelancers or those working in specific sectors like the restaurant industry often do not mention their company's name or may not have one. In such cases, it is unlikely to find their email address.