diff --git a/nixos/machines/nyarlathotep/mail.nix b/nixos/machines/nyarlathotep/mail.nix
index 9eb7ce1..336b29f 100644
--- a/nixos/machines/nyarlathotep/mail.nix
+++ b/nixos/machines/nyarlathotep/mail.nix
@@ -4,7 +4,7 @@ flake-inputs:
 
   mailserver = {
     enable = true;
-    debug = true; # TODO disable
+    debug = false; # TODO disable
     fqdn = "mathebau.de";
     sendingFqdn = "fb04184.mathematik.tu-darmstadt.de";
     domains = [
diff --git a/nixos/roles/xen_guest.nix b/nixos/roles/xen_guest.nix
index 9c9ee32..f7cef3e 100644
--- a/nixos/roles/xen_guest.nix
+++ b/nixos/roles/xen_guest.nix
@@ -10,6 +10,7 @@
       kernelModules = [ ];
     };
     extraModulePackages = [ ];
+    tmp.useTmpfs = true;
   };
 }