We are quickly moving in to a new world - a 'wireless world' sporting trendy Internet -enabled, handheld devices, and interactive television. New marketing methods are emerging, forcing companies to change the way they search out and connect with their customers. The revolutionary element of 'trackable digital delivery' is helping marketers measure their efforts and gain real-time intelligence about their customer base. Today's businesses are looking for economical ways to stretch their marketing dollars. Many companies have already turned to more cost effective methods such as e-mail marketing to reach their customers. Although a relatively new marketing channel, more than $6.8 billion will be invested in e-mail marketing resources by 2006. This article take a look at what is e-marketing, how e-marketing works, technique of e-marketing, e-marketing in developing countries, benefits and problems of e-marketing.