Install libnet-citadel-perl by entering the following commands in the terminal:
sudo apt update sudo apt install libnet-citadel-perl
Citadel.org protocol coverage
Citadel is a "turnkey open-source solution for email and collaboration". The main component is the Citadel server. To communicate with it you can use either a web interface, or - if you have to automate things - with a protocol. NET::Citadel tries to do a bit of abstraction and handles some of the protocol handling. The basic idea is that the application using the package deals with Citadel's objects: rooms, floors, users.