Set up a Postfix Mail Server With Dovecot and Squirrelmail on Ubuntu 16.04

Learn how to set up a mail server on a 1&1 Cloud Server running Ubuntu 16.04. This tutorial features Postfix as an SMTP server, Dovecot for POP/IMAP functionality, and Squirrelmail as a webmail program for users to check and receive email from a web browser. The tutorial will also walk you through the process of creating and using a self-signed SSL certificate for use in securing incoming and outgoing email connections. [...]