https://techcrunch.com/2019/04/01/mailgun-changes-hands-again-as-thoma-bravo-buys-majority-stake/

Mailgun, an email API delivery service, announced today that it was selling a majority stake in the company to private equity firm Thoma Bravo. The companies did not share terms, but this is the second owner in the company’s 8+ year history.

Mailgun provides API services for building email functionality into applications. It has over 150,000 customers today using its APIs, according to data provided by the company.