I am expert in Lead research.Also, I am familiar with LINKEDIN Sales Navigator/Recruiter and LINKEDIN Rapportive.I know how to find anyone valid email address and how to check it.I never believe Email Hunter or FLT or any other email collector apps or extension.I collect all Leads manually. High-Quality Business leads ( B2B, B2C, Real estate, Dentist, IT, LAW, Restaurants, Food, GYM, Corporate org, any business with their Top management contact or your required person)