There is quick information on running mailman on docker at https://github.com/maxking/docker-mailman#running

It would be great to, eventually, get the list onto blockchains so that everybody stays connected.

Here are the instructions for running mailman from the link:

$ apt install docker.io docker-compose

$ mkdir -p /opt/mailman/core
$ mkdir -p /opt/mailman/web
$ git clone https://github.com/maxking/docker-mailman
$ cd docker-mailman
# Change some configuration variables
$ docker-compose up -d