Mail-in-a-Box is a free and open source application that makes it easy to turn your Ubuntu 14.04 server into a complete, full-stack email solution for multiple domains. Mail-in-a-Box helps individuals take back control of their email by defining a one-click, easy-to-deploy SMTP+everything else server: a mail server in a box. Each Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software. It also includes contacts and calendar synchronization. The installation process should take about 10-15 minutes if you follow the very easy steps described below.