Don’t be startled at the question. Most reasons why Email marketing doesn’t fetch anticipated results is because the question wasn’t asked and if asked, wasn’t accurately responded to.
Search for Email Marketing and you get a host of Email Marketing Tool Providers. They all offer a set of features that have almost become a category standard. Unlimited Subscribers, Bulk Email marketing, delivery to the Inbox, guaranteed leads, multiple templates, and so on. When compared, all the options deliver on these key evaluating parameters, but of course, at varying levels, which helps you to arrive at the decision.