At present, the use of emails has increased significantly. Today is one of the easiest and fastest forms of asynchronous communication, especially over long distances, in a convenient and secure way. This document details aspects of communication through Internet access, in order to show a simpler to traditional application, along with the SMTP protocol, an email transfer protocol, it consists of a client- server, which shows the sending of emails to different email addresses at the same time, application which was designed in Java programming language, this allows the client to be multiplatform, using the NetBeans ID, in addition to this, account with the use of different libraries including javax, where the results were to transmit information, with and without attachments, sending such information to 3 different mails at the same time, to interact between different mail servers, reliably, in addition to this provides a user-friendly interface, allowing effective communication.