The majority of email marketing experts realize that the emphasis of clients is actually shortage of time. That´s why they consider they base the key success of email marketing campaigns on how well the priority of the message can call attention to potential clients, in order to facilitate better communication. The ineffectiveness of massive email is illegal in most cases. The better alternative of Internet marketing is through making all segments effective by the clients and adapting the same content. It is fundamental to segment audiences, personalize and adapt the offer, look and assess the results with other tools of traditional communication. It is important to recognize the laws that accompany this communication tool, like informing clients of date collections, offer the information immediately, and gratituity of commercial listings, along with many other aspects.