[Rspamd] More spam headers

data/conf/rspamd/local.d/groups.conf

@@ -9,8 +9,8 @@ symbols {
   "BAD_REP_POLICIES" {
     score = 2.5;
   }
-  "BULK_HEADERS" {
-    score = 2.0;
+  "BULK_HEADER" {
+    score = 2.5;
   }
 }