Email marketing continues to be the highest ROI-driving force of marketing. According to Constant Contact, email marketing has a return on investment (ROI) of $42 for every $1 spent. Just to put things in perspective, email marketing is more likely to drive sales than social media marketing! In this article on email engagement trends for 2021, we cover the variables that most impact email deliverability, how to boost user engagement in 2021, the most used email clients and how frequently users want to hear from you (you’ll be surprised!).