diff --git a/nixbld-etc-nixos/configuration.nix b/nixbld-etc-nixos/configuration.nix
index 9df28c9..0bf2668 100644
--- a/nixbld-etc-nixos/configuration.nix
+++ b/nixbld-etc-nixos/configuration.nix
@@ -1262,10 +1262,7 @@ in
 
   environment.etc."postfix/sender_relay".text = ''
       @m-labs-intl.com [localhost]:1587
-      @m-labs.hk :
-      @m-labs.ph :
-      @193thz.com :
-      @malloctech.fr :
+      * :
   '';
   systemd.services.postfix-rebuild-sender-relay = {
       description = "Postfix Rebuild Sender Dependent Relayhost Maps";