{
  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-21.05-small";
    utils.url = "github:gytis-ivaskevicius/flake-utils-plus/staging";

    snm = {
      url = "gitlab:simple-nixos-mailserver/nixos-mailserver";
      inputs.nixpkgs.follows = "nixpkgs";
      inputs.flake-utils.follows = "utils/flake-utils";
    };
  };
  outputs = { self, nixpkgs, ... }@inputs: {
    inherit self inputs;
    nixosConfigurations."thrall" = nixpkgs.lib.nixosSystem {
      system = "x86_64-linux";
      modules = [
        inputs.snm.nixosModule
	./hosts/thrall
      ];
    };
  };
}