Email marketing is known to have the highest return on the investment, because it’s the least expensive way of promoting your service or product. They library of the content formed into an email campaigns can be used for years. This makes it one of the most effortless methods of engaging when it’s automated.
Email is know to drive the highest conversion, with average open rate of 19%, and click through rate of 2.5%. These numbers are even higher than any other marketing methods such as display network, search network, or social media.