John Foreman is the Chief Data Scientist at Rocket Science , the company behind MailChimp.com , Mandrill.com , TinyLetter.com , and twelve other email-related web and mobile apps. The Rocket Science Group is an email delivery company that focuses on transactional emails, marketing emails, and newsletters for groups and companies ranging from one person all the way up to multinational companies. The three main services send over ten billion emails per month for their six million customers. Ten thousand new members sign up each day. With this growth comes challenges, as the increasing numbers of members, recipients, email addresses, and emails sent make it harder and harder to fight spam intelligently, model email sender and receiver behavior, and understand the overall email ecosystem.