Email Marketing Statistics Email marketing statistics you need to know The total number of active email users is expected to grow to over 4 billion by 2022 81% of all small businesses rely on email marketing as their primary acquisition channel to find new customers Active email accounts are expected to grow to over 5 billion by 2019. 59% of marketers say email marketing is their biggest source of ROI among other online marketing methods. It's estimated that the U.S. will spend over 350 million dollars on email marketing in 2019 and that number is expected to continue to grow. Revenue for B2B marketing automation systems increased 60% to $1.2 million in 2014, compared to a 50% increase in 2013. – VentureBeat Mobile opens accounted for 46 percent of all email opens. Litmus.com 93% of B2B marketers use email to distribute content (Content Marketing Institute)