E-Marketing has led to a new online shopping behaviour among consumers, by utilising technology and the convenience it provides. This study focuses on consumer behaviour in in MatahariMall.com based in Bandung. It was found consumer behaviour changes perceptions and beliefs in terms of influencing their purchase decision. This study attempts to find out if e-Marketing of Mataharimall.com influences consumer's purchase decision by creating trust in the product. The sample population of this study are 100 consumers from Singapore and their purchasing decisions at MatahariMall.com. Results showed that e-marketing had won the trust of these consumers to ultimately influence their purchasing decisions, more so as these consumers had never made a purchase in MatahariMall.com before this. Therefore, trust had a significant role in purchase decisions.