{ pkgs, ... }: {
  networking.firewall.allowedTCPPorts = [ 25 110 143 465 587 993 995 4190 ];
  environment.systemPackages = [ pkgs.docker-compose ];
  virtualisation.docker = {
    enable = true;
    daemon.settings = {
      ipv6 = true;
      fixed-cidr-v6 = "fd00:dead:beef:c0::/80";
      experimental = true;
      ip6tables = true;
    };
  };
}