[Minor] Add default

diff --git a/src/plugins/lua/rbl.lua b/src/plugins/lua/rbl.lua
index 7447850110d73fba05913142d1d0cebdd6446bce..32eb4f2d01fec235d7ff375b4b11b235f71d71de 100644 (file)
--- a/src/plugins/lua/rbl.lua
+++ b/src/plugins/lua/rbl.lua
@@ -219,8 +219,10 @@ local function rbl_cb (task)
 
   local havegot = {
     emails = {},
-    received = {}
+    received = {},
+    dkim = {},
   }
+
   local notgot = {}
 
   local alive_rbls = fun.filter(function(_, rbl)