fix typo in RCVD_UNAUTH_PBL

conf/composites.conf

@@ -87,7 +87,7 @@ composites {
     policy = "leave";
   }
   RCVD_UNAUTH_PBL {
-    expression = "RECEIVED_PBL & -RCVD_VIA_SMTP_AUTH";
+    expression = "RECEIVED_PBL & !RCVD_VIA_SMTP_AUTH";
     description = "Relayed through ZEN PBL IP without sufficient authentication (possible indicating an open relay)";
     score = 2.0;
     policy = "leave";