When you buy LeadGrabber Append email credits, you are paying for the effort of Internet Research. We do not know ahead of time whether an email will be invalid or deliverable. Our pricing is similar to what you would pay a manual internet researcher - except, the LeadGrabber product is many times faster.

That's why during the research process, LeadGrabber gives you other email addresses that it found. These are Co-Worker's email addresses and also corporate email addresses. The intention is, even if the email of target person is invalid, because they are not currently employed at that company, you have alternate people who you can contact.