diff --git a/nixos/modules/services/mail/postfix.nix b/nixos/modules/services/mail/postfix.nix
index 616018fc307..c97aad77419 100644
--- a/nixos/modules/services/mail/postfix.nix
+++ b/nixos/modules/services/mail/postfix.nix
@@ -210,12 +210,13 @@ in
 
       submissionOptions = mkOption {
         type = types.attrs;
-        default = { "smtpd_tls_security_level" = "encrypt";
+        default = {};
+        description = "Options for the submission config in master.cf";
+        example = { "smtpd_tls_security_level" = "encrypt";
                     "smtpd_sasl_auth_enable" = "yes";
                     "smtpd_client_restrictions" = "permit_sasl_authenticated,reject";
+                    "milter_macro_daemon_name" = "ORIGINATING";
                   };
-        description = "Options for the submission config in master.cf";
-        example = { "milter_macro_daemon_name" = "ORIGINATING"; };
       };
 
       setSendmail = mkOption {