How to set up Zimbra mail server on CentOS

In this tutorial, we will examine the process of installing Zimbra mail server in CentOS Linux environment. Zimbra is my personal favorite when it comes to open-source mail servers as it comes with a number of useful features such as built-in calendar support, email filtering rules, a modern interface for both users and admins, spam and malware scanners, etc. Besides server-side components, Zimbra also boasts of a full-featured web-based email client.