3 files changed, 14 insertions, 2 deletions
diff --git a/actionmailer/lib/action_mailer/base.rb b/actionmailer/lib/action_mailer/base.rb
index 650dd8bbda..5610212fad 100644
--- a/actionmailer/lib/action_mailer/base.rb
+++ b/actionmailer/lib/action_mailer/base.rb
@@ -461,7 +461,7 @@ module ActionMailer
 
     helper ActionMailer::MailHelper
 
-    class_attribute :delivery_job, default: ::ActionMailer::MailDeliveryJob
+    class_attribute :delivery_job, default: ::ActionMailer::DeliveryJob
     class_attribute :default_params, default: {
       mime_version: "1.0",
       charset:      "UTF-8",
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]
diff --git a/actionmailer/lib/action_mailer/railtie.rb b/actionmailer/lib/action_mailer/railtie.rb
index bb6141b406..23488db790 100644
--- a/actionmailer/lib/action_mailer/railtie.rb
+++ b/actionmailer/lib/action_mailer/railtie.rb
@@ -46,6 +46,10 @@ module ActionMailer
         register_preview_interceptors(options.delete(:preview_interceptors))
         register_observers(options.delete(:observers))
 
+        if delivery_job = options.delete(:delivery_job)
+          self.delivery_job = delivery_job.constantize
+        end
+
         options.each { |k, v| send("#{k}=", v) }
       end