some Ratchet update

hosts/generic/configuration_generic.nix

@@ -37,6 +37,9 @@
     "192.168.1.94" = [ "Qwark" ];
   };
 
+  # mailing
+  services.exim.enable = true;
+
   # locales
   i18n.extraLocales = [ "en_US.UTF-8/UTF-8" "C.UTF-8/UTF-8" "ru_RU.UTF-8/UTF-8" ];