Most professionals use email every day for business — in fact, it’d be hard not to, with 281 billion messages sent and received on a daily basis. But when it comes to marketing, much of the attention gets focused on social media, which — while popular and highly visible — has a conversion rate less than half that of email marketing (4.29% vs. 1.81%), according to a recent analysis. Indeed, one 2015 study revealed that email marketing had an average ROI of £38 (about $50 USD) for every dollar invested.