Apps I use on a daily basis
Steps were re-written from below links for faster setup.
This guide assumes you are using Ubuntu 18 and Nginx.
Part 1: Build Your Own Email Server on Ubuntu: Basic Postfix Setup - LinuxBabe
Part 2: Install Dovecot IMAP server on Ubuntu and Enable TLS Encryption
Part 3: How to Set up SPF and DKIM with Postfix on Ubuntu Server