It mostly provides the convenience of aliasing `docker exec -ti <CONTAINER NAME> setup`, inferring the container name of a running `docker-mailserver` instance or running a new instance and bind mounting necessary volumes implicitly.
It is intended to be run from the host machine, _not_ from inside your running container. The latest version of the script is included in the `docker-mailserver` repository. You may retrieve it at any time by running this command in your console: