This document discusses the power of email marketing for customer loyalty programs. It provides statistics showing that email is a core part of business and a growing channel, with over 2.6 billion users in 2015. Email is measurable, engaging, targeted, and affordable. The document advocates using email at all stages of the customer lifecycle, from acquisition to ongoing engagement, and emphasizes optimizing emails for mobile. It argues that loyalty programs need to evolve by building relationships through recognition, relevancy, emotion, and engagement in order to be successful.