When opening emails, the modern email user is using a mobile device. In fact, 75% of Gmail users use mobile devices when opening or interacting with email. Keeping mobile in mind is a key component of a successful email marketing strategy because it ensures your emails are reaching the largest audience. Making sure your emails are compatible with mobile devices will become even more important over time. A recent study also showed that by the end of 2018, worldwide mobile email users are expected to total over 2.2 billion. Making sure your emails are easy to read and interact with in mobile is a huge component of your emails performance.