Install mailman3-full by entering the following commands in the terminal:
sudo apt update sudo apt install mailman3-full
Description:
Full Mailman3 mailing list management suite (metapackage)
This is GNU Mailman, a mailing list management system. This metapackage depends on all components of the full Mailman3 suite: . * mailman3: The core Mailman3 delivery engine * mailman3-web: Django project integrating Mailman3 postorius and hyperkitty * python3-mailman-hyperkitty: Mailman3 server plugin for Hyperkitty archiver
Homepage: http://www.list.org/
Version: 3.1.1-9
Section: universe/mail