Methodology
Start with a google search (“Who is in THIS role at THIS company?”) Then go to phonebook.cz, hunter.io or equivalent to identify the email formatting. Try to find the person and discover or guess the pattern or format. Go to tools.emailhippo.com or equivalent to verify the emails, but sometimes you get false positives. You probably will only be verifying emails and not doing any kind of interaction. Clearbit Connect is limited so be careful how much you use it.