In this post, we will show you how to install Rainloop Webmail on an Ubuntu VPS with Nginx and MariaDB. Rainloop Webmail is a simple, modern and fast web-based email client, written in PHP. Some of the features of the application includes: modern user interface, support of IMAP and SMTP protocols, keyboard shortcuts and autocompletion.
This should work on other Linux VPS systems as well but was tested and written for Ubuntu 14.04.