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Step 1 — Installing Postfix In this step, you'll learn how to install Postfix. The most efficient way to install Postfix and other programs needed for testing email is to install the  mailutils  package. First, update the package database: sudo apt-get update Finally, install Postfix. Installing  mailtuils  will install Postfix as well as a few other programs needed for Postfix to function. sudo apt install mailutils Near the end of the installation process, you will be presented with a window that looks exactly like the one in the image below. The default option is  Internet Site . That's the recommended option for this tutorial, so press  TAB , then  ENTER . After that, you'll get another window just like the one in the next image. The  System mail name  should be the same as the name you assigned to the server when you were creating it. If it shows a subdomain like  subdomain.example.com , change it to just ...