In this article, we will show you how to set up and configure a mail server with Postfix, Dovecot, Spamassassin, SQLite and PostfixAdmin on an Ubuntu 16.04 VPS with Nginx and PHP 7.0. This guide should work on other Linux VPS systems as well but was tested and written for an Ubuntu 16.04 VPS. To set up a mail server with PostfixAdmin, just follow the steps below.