Change Citadel Domain
We will use mail as hostname, mail.example.net as our original domain, and mail.example.com as our new domain; and 203.0.113.1 as our public facing IP address on this page for the citadel server. Replace with your own.
Pre-Install Before you start set your DNS to point your domain to the servers IP. How to do that is out of this manuals scope. Next we will set some variables, replace with your domain and IP address then execute following in your servers shell.