{
  description = "quasar system configuration";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.05";
    simple-nixos-mailserver.url = "gitlab:simple-nixos-mailserver/nixos-mailserver/nixos-24.05";
  };

  outputs = { nixpkgs, simple-nixos-mailserver, ... }: {
    nixosConfigurations.quasar = nixpkgs.lib.nixosSystem {
      system = "x86_64-linux";
      modules = [
        ./configuration.nix
        simple-nixos-mailserver.nixosModule
      ];
    };
  };
}