According to eMarketer Study, an average email marketing ROI is 122%. This means, for every 1 rupee spent you earn 1 rupee 22 paisa in return. People buy more products form the businesses who send email to their customers on a daily basis as compared to non-email senders . People buy products & services marketed through email spend 138% more than people who do not receive email offers.
Online-Mail Marketing is one of the cheapest forms of marketing strategy. This is one of the main reasons of its high ROI.