
Mailman can now work with MTAs other than Postfix. You'll have to configure it yourself using the options in `services.mailman.settings.mta`. This addition is reflected in the release notes for 21.03.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at https://nixos.org/nixos and in the manual in doc/manual.