[Feature] Add spamhaus DROP dnsbl

conf/metrics.conf

@@ -505,6 +505,10 @@ metric {
             weight = 2.0;
             description = "From address is listed in zen pbl (Spamhaus list)";
         }
+        symbol "RBL_SPAMHAUS_DROP" {
+            weight = 7.0;
+            description = "From address is listed in zen drop bl";
+        }
         symbol "RECEIVED_SPAMHAUS_XBL" {
             weight = 3.0;
             description = "Received address is listed in zen xbl";

conf/modules.d/rbl.conf

@@ -34,6 +34,7 @@ rbl {
                 RBL_SPAMHAUS_XBL3 = "127.0.0.7";
                 RBL_SPAMHAUS_PBL = "127.0.0.10";
                 RBL_SPAMHAUS_PBL1 = "127.0.0.11";
+                RBL_SPAMHAUS_DROP = "127.0.0.9";
             }
         }