When you buy LeadGrabber, you are paying us for the effort of the Internet Research. It is similar to paying for a manual researcher, where you pay for the effort put into the investigation / research. 

Depending on the contacts that you put into LeadGrabber, you may get 1-Deliverable emails, or even 3 & 4 ranked emails. Try to put in Contacts which are more recent; if you put in contacts that are too old, then chances are, those people have moved jobs and are not longer there at those companies - these contacts will receive 4-rated email.

Sometimes when you capture a list from LinkedIn, you will still get a certain proportion of 3 & 4 ranked emails, depending on your industry niche. This is because some people have left those companies and probably not updated their LinkedIn profile (for various reasons). To get around this problem, you should try using the Sales Navigator filter "who's moved in the last 90 days" - this increases your chances of getting people who are still at their new jobs.

To offset all the 3 & 4 rated emails that you get, we give you the Co-Worker Email addresses that we find during the research process. If your primary target does not have a valid email, you can reach out to these Co-Workers instead. We also recommend you run an email verification on these Co-Workers before sending them emails, so that any bounces are reduced. Visit this KB article to see how to extract and use the Co-Worker's email addresses.