amelioration(email): passe les jobs non prioritaire [appelons ça des bulk email], dans la queue de low_priority

app/mailers/concerns/priority_delivery_concern.rb

@@ -0,0 +1,10 @@
+module PriorityDeliveryConcern
+  extend ActiveSupport::Concern
+  included do
+    self.delivery_job = PriorizedMailDeliveryJob
+
+    def self.critical_email?(action_name)
+      raise NotImplementedError
+    end
+  end
+end