Email marketing is the act of sending promotional messages to people in mass quantities. It typically is to generate sales or leads and it may contain advertising. Email marketing is still ranked as the most effective marketing channel, beating out social media, SEO, and affiliate marketing. Why is that? Email marketing has an ROI of Ksh.4300 ($38) for every Kenya Shillings / dollar spent, meaning it deserves a place in every marketer’s toolbox.