Hunter.io

Hunter.io is a business email lookup tool built by the French company Hunter (formerly Email Hunter). It's made for salespeople, founders, recruiters, and marketers who need to reach specific people at companies and don't have their direct contact.

It works simply: enter a person's name and their company domain, or just the company domain, and Hunter returns publicly available work emails along with how verified they are. For each address it shows a confidence score and the sources it pulled it from, so you know how much you can rely on it.