Short answer LeadGrabber finds 99% of the prospect emails that are findable on the web & is 10x faster than human researcher (50+ leads per hour). Your success rate depends on web presence of your prospect & company. See more details below Detailed Answer eGrabber does deep-web searches and finds prospect email-IDs faster & better than human experts. The B2B prospecting software finds 99% of the prospect emails that expert researchers find & is 10x faster than a human researcher; researches 50+ leads per hour. Unlike most human researchers, it will go back and ping the company's email server to verify if the found email is still valid. Sometimes a LinkedIn profile might say a person is working in a company, but in reality, they are gone & company disconnected their email. This method catches that. If the B2B prospecting tool can't find a valid email-ID of the prospect on the web, it looks at email patterns of co-workers in the same company and makes intelligent guesses at possible email-IDs. It then pings the company email server & determines the best email addresses based on ping status We provide email verify status of every email-ID we give you If you use only #1 rated emails from eGrabber, the email deliverability will be 96%+ If you use #2 rated emails, then email deliverability will be around 75% - because in such emails, the company's email server refuses to acknowledge existence or not existence of such an email. We hold the only US Patent that was awarded for finding B2B email-IDs with name & company. Here is the link to our patents eGrabber Patents. Accuracy varies depending on your use case There is a huge variance in found email depending on the industry and type of people you are targeting-in all cases we find 99% of findable B2B email-IDs. If you look for john smith, plumber who may not be on the Internet and who may not even have a B2B email id, the find probability is low. If you look for B2B executives in marketing, then the find rate is guaranteed to be high. To find out what the accuracy rate for your industry and title is, we suggest you to try our B2B prospecting tool and get 150 leads for free. Get yourself 150 contacts that represent your ideal sample & do a live test. That is the best way for you to know what type of accuracy you can expect.