Fix legacy fallback for parameterized mailers

1 files changed, 9 insertions, 1 deletions

diff --git a/actionmailer/lib/action_mailer/parameterized.rb b/actionmailer/lib/action_mailer/parameterized.rb
index 999435919e..0a97af8105 100644
--- a/actionmailer/lib/action_mailer/parameterized.rb
+++ b/actionmailer/lib/action_mailer/parameterized.rb
@@ -145,12 +145,20 @@ module ActionMailer
           if processed?
             super
           else
-            job  = @mailer_class.delivery_job
+            job  = delivery_job_class
             args = arguments_for(job, delivery_method)
             job.set(options).perform_later(*args)
           end
         end
 
+        def delivery_job_class
+          if @mailer_class.delivery_job <= MailDeliveryJob
+            @mailer_class.delivery_job
+          else
+            Parameterized::DeliveryJob
+          end
+        end
+
         def arguments_for(delivery_job, delivery_method)
           if delivery_job <= MailDeliveryJob
             [@mailer_class.name, @action.to_s, delivery_method.to_s, params: @params, args: @args]