We have spidered the web for years and saved the e-mail addresses we’ve found. After the GDPR* we didn’t want to keep this individual data, but our customers stil want to find e-mail addresses. Therefore we researched over a billion e-mail addresses to analyze the e-mail address formats for every company website we could (over 100 million worldwide). If you know the company and name of a person we probably can produce the e-mail address.
We now made this data freely available for personal use (up to 10 searches a day).
* The GDPR (General Data Protection Regulation) is a EU privacy/security law that prohibits saving personal information without consent. Therefore we don’t save personal email addresses, but just the email address format.