update dkim policy [ci skip]

modules/kubernetes/mailserver/variables.tf

@@ -111,7 +111,7 @@ sender_canonical_classes = envelope_sender
 recipient_canonical_maps = tcp:localhost:10002
 recipient_canonical_classes = envelope_recipient,header_recipient
 compatibility_level = 2
-enable_original_recipient = no
+# enable_original_recipient = no  # b4 uncommenting see https://serverfault.com/questions/661615/how-to-drop-orig-to-using-postfix-virtual-domains
 always_add_missing_headers = yes
 EOT
 }