citadel-mta software package provides complete and feature-rich groupware server (mail transport agent), you can install in your Ubuntu 16.04 LTS (Xenial Xerus) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install citadel-mta
citadel-mta is installed in your system.
Make ensure the citadel-mta package were installed using the commands given below,
$ sudo dpkg-query -l | grep citadel-mta *
You will get with citadel-mta package name, version, architecture and description in a table
| Distro | Ubuntu 16 04 lts xenial xerus |
| Section | |
| Package | citadel-mta |
| Version | 9.01-1 |
| Description | complete and feature-rich groupware server (mail transport agent) |
| Sub Section |