_: {
    users.users.stalwart = {
        isSystemUser = true;
        group = "stalwart";
        home = "/var/lib/stalwart";
    };

    users.groups.stalwart = {};

    services.stalwart-mail = {
        enable = true;
        settings = {
            server = {
                hostname = "mail.jacekpoz.pl";
                run-as = {
                    user = "stalwart";
                    group = "stalwart";
                };
                #listener = {
                #    lmtp = {
                #        protocol = "lmtp";
                #        bind = [ "0.0.0.0:9900" ];
                #    };
                #    smtp = {
                #        protocol = "smtp";
                #        bind = [ "0.0.0.0:9901" ];
                #    };
                #    jmap = {
                #        protocol = "jmap";
                #        bind = [ "0.0.0.0:9902" ];
                #        url = "https://mail.jacekpoz.pl/jmap";
                #    };
                #};
            };
            global = {
                thread-pool = 4;
                shared-map = {
                    shard = 32;
                    capacity = 10;
                };
                tracing = {
                    method = "journal";
                    level = "warn";
                };
            };
        };
    };

    services.caddy = {
        enable = true;
        virtualHosts."mail.jacekpoz.pl".extraConfig = ''
            handle_path /jmap* {
                reverse_proxy * localhost:9902
            }
        '';
    };
}