Development and status
Mailman 3 is essentially five projects:
Mailman 3.0 is most suitable to new installations of Mailman. We do not guarantee that it will work well for migrations and upgrades of Mailman 2.x; we believe that will work, but encourage you to make backups and test your migrations first. It is not yet at full feature parity with Mailman 2.x, but we're working on that for 3.1.
Puppet module to manage/install mailman3 (WIP - Active development in the 'ASF_Developement' branch)
Currently the best path for installing the entire Mailman 3 suite at once is Mailman Bundler:
If you're installing on Ubuntu, see DEV/Mailman 3.0/Mailman 3.0 Suite Install on Ubuntu for the commands to install the prerequisites.
We do eventually hope to have appropriate packages for some popular distros, so if you prefer packages only, please be patient!
If you want to try Mailman 3 suite out in Docker, you might want to see DEV/Mailman 3.0/Mailman 3.0 Suite Dockerfile. I am still looking for someone to help provide nice instructions on how to use this, including connecting port 8000 inside the container to a port on the outside so that the tutorial can end with "and now go to http://localhost:8000/mailman3 to check out the web interface!"