diff --git a/cmdeploy/src/cmdeploy/opendkim/final.lua b/cmdeploy/src/cmdeploy/opendkim/final.lua
index e68a486d..fef5eb9e 100644
--- a/cmdeploy/src/cmdeploy/opendkim/final.lua
+++ b/cmdeploy/src/cmdeploy/opendkim/final.lua
@@ -10,6 +10,7 @@ if nsigs == nil then
 end
 
 local valid = false
+local sigerrors = ""
 for i = 1, nsigs do
 	sig = odkim.get_sighandle(ctx, i - 1)
 	sigres = odkim.sig_result(sig)
@@ -21,6 +22,8 @@ for i = 1, nsigs do
 	-- means the message is acceptable.
 	if sigres == 0 then
 		valid = true
+    else
+        sigerrors = sigerrors .. " " .. tostring(sigres)
 	end
 end
 
@@ -31,7 +34,7 @@ if valid then
 		odkim.del_header(ctx, "DKIM-Signature", i)
 	end
 else
-	odkim.set_reply(ctx, "554", "5.7.1", "No valid DKIM signature found")
+	odkim.set_reply(ctx, "554", "5.7.1", "No valid DKIM signature found. Search https://github.com/trusteddomainproject/OpenDKIM/blob/master/libopendkim/dkim.h#L108 for " .. sigerrors)
 	odkim.set_result(ctx, SMFIS_REJECT)
 end