The biggest advantage if Citadel is ease of installation and ease of configuration. Both of these can be a serious hassle when you are building a Postfix mail server from scratch. So the focus of this documentation is clear easy configuration. The goal also requires a mail server that has an easy interface to make changes with and that is intuitive. That goal is provided by the web interface that you can use to make modifications to the server. The final goal is to create a system that will effectively clean Spam and virus email. Spam will be cleaned using Spamassassin and virus problems will be cleaned by ClamAv.