[Conf] Add missing symbols

conf/scores.d/headers_group.conf

         weight = 4.0;
         description = "One received header with 'bad' patterns inside";
     }
+    "DIRECT_TO_MX" {
+        weight = 0.0;
+        description = "Message has been directly delivered from MUA to local MX";
+    }
     "MAILLIST" {
         weight = -0.2;
         description = "Message seems to be from maillist";

conf/scores.d/policies_group.conf

         description = "SPF DNS failure";
         groups = ["spf"];
     }
+    "R_SPG_NA" {
+        weight = 0.0;
+        description = "Missing SPF record";
+        one_shot = true;
+        groups = ["spf"];
+    }
 
     # DKIM
     "R_DKIM_REJECT" {
         one_shot = true;
         groups = ["dkim"];
     }
+    "R_DKIM_NA" {
+        weight = 0.0;
+        description = "Missing DKIM signature";
+        one_shot = true;
+        groups = ["dkim"];
+    }
 
     # DMARC
     "DMARC_POLICY_ALLOW" {
         description = "DMARC failed";
         groups = ["dmarc"];
     }
+    "DMARC_NA" {
+        weight = 0.0;
+        description = "No DMARC record";
+        groups = ["dmarc"];
+     }
 
     # ARC
     "ARC_ALLOW" {