diff --git a/modules/mailserver/postfix.nix b/modules/mailserver/postfix.nix
index d1aca5d..5342054 100644
--- a/modules/mailserver/postfix.nix
+++ b/modules/mailserver/postfix.nix
@@ -141,6 +141,7 @@ lib.mkIf cfg.enable {
       # Postscreen
       smtpd = {
         type = "pass";
+        args = [ "-o" "smtpd_discard_ehlo_keywords=silent-discard,dsn" ];
       };
       smtp_inet = {
         # Partially overrides upstream