[Postfix/Rspamd] Do not reject unauthenticated sender mismatches but rewrite their subject and assign symbol SPOOFED_SENDER with score 1.0

data/conf/rspamd/local.d/force_actions.conf

@@ -2,7 +2,7 @@ rules {
   DKIM_FAIL {
     action = "add header";
     expression = "R_DKIM_REJECT & !MAILLIST & !MAILCOW_WHITE & !MAILCOW_BLACK";
-    require_action = ["no action", "greylist"];
+    require_action = ["no action", "greylist", "soft reject"];
   }
   VIRUS_FOUND {
     action = "reject";
@@ -19,4 +19,9 @@ rules {
     expression = "WHITELISTED_FWD_HOST";
     require_action = ["greylist", "soft reject"];
   }
+  ADD_UNAUTH_SUBJ {
+    action = "rewrite subject";
+    subject = "[Unauth] %s";
+    expression = "SPOOFED_SENDER";
+  }
 }