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This rapid development of technological knowledge can help humans fulfill the new order of civilization in the era of technology that was created to make daily work easier. Computers are not only used as electronic typewriters but have been used to increase work and business productivity. An information system is a system that provides information for the decision-making process at every level in an organization. Network users control what they do through graphical applications prepared for the user. All data including electronic mail (e-mail), databases are stored on the server. Special servers for the internet or even for certain internet functions are the heart of information on the internet. Getting many benefits from the internet, for example reducing communication costs, improving communication and coordination skills, distributing knowledge and providing facilities for e-business or e-commerce, including reducing communication costs. In this article the author explains the implementation of the internetworking concept (internet and extranet), the benefits of using each and the development that can be carried out from the internetworking concept, components and forms of application of the internetworking.

In today's era, information exchange is fast and can be done in various ways and one of them is using email. There are many free email service providers that can be used, such as Gmail, Yahoo Mail and Outlook. In addition to free services, email servers can also be used to serve communication between clients and transfer data over the local network using a custom domain for the company. The purpose of this report is to build your own email server using the server development method using the Linux Ubuntu 18.04 operating system and the software Postfix and Dovecot as its supports. The results of this mail server work can send emails from one user to another through the terminal directly correctly. Sending can be done directly using the terminal without creating a text first or creating a text before sending it. Both ways are equally successful in the main process in the mail server.