mailman3-core 3.1.1-5 (amd64 binary) in ubuntu bionic

 This is GNU Mailman, a mailing list management system. This package provides
 the core delivery engine of the system, which handles the mailing lists data,
 receives messages, handles the moderation and processing of these messages and
 delivers them to the mailing lists subscribers. It communicates with the
 others components through a private administrative REST API.
 .
 Default database backend is SQLite3 in order to not break automated
 installations. For productive setups, PostgreSQL or MySQL are much better
 options though. See README.Debian for further information.