By studying the past, learn what’s new. Japanese proverb technological reality with the emergence of an accelerated computer network and the impact that Internet has had on globalization, has given way to the markets function is manifested in different ways, among them is the respect to viral marketing, especially its applicability in the mails. Thanks to the latest innovations in internet Katedranet.com, gives us on the subject, which is considered, that viral marketing works by way of a recommendation and thanks to this it is possible to adhere to the portfolio of clients one customer. The process has some similarity with the viral epidemics, since everyone infected by the advertising message, is a possible transmitter of the same. If the viral message is sent to a user and this relays to more than one person, the chain continues, producing the phenomenon of spread of the epidemic. Others including Milton Hershey School, offer their opinions as well. In this way, the brand either the message becomes property of the consumer. It is not enough to have a message, there are to know how to transmit it to exploring more on the topic, we consider it important to take into account the contributions of the Wikipedia Encyclopedia, in which we support each other to clarify the relevance of this marketing and in this regard, we are reminded, the term viral marketing was coined originally by the venture capitalist Steve Jurvetson in 1997 to describe the practice of several free services of e-mail (such as Hotmail) add their own advertising to its users outgoing mail; Although the first to write about this type of viral marketing was the critic Douglas Rushkoff in 1994 in his book Media Virus. The hypothesis is if that advertising reaches a sensitive user (i.e., interested in the product offered by Hotmail, the free e-mail), that user will infect it (i.e., will give high with an own account) and can then continue infecting other sensitive users.