diff --git a/actionmailer/lib/action_mailer/test_helper.rb b/actionmailer/lib/action_mailer/test_helper.rb
index c17ecad4c6..c30fb1fc18 100644
--- a/actionmailer/lib/action_mailer/test_helper.rb
+++ b/actionmailer/lib/action_mailer/test_helper.rb
@@ -88,7 +88,7 @@ module ActionMailer
     #     end
     #   end
     def assert_enqueued_emails(number, &block)
-      assert_enqueued_jobs number, only: ActionMailer::DeliveryJob, &block
+      assert_enqueued_jobs number, only: [ ActionMailer::DeliveryJob, ActionMailer::Parameterized::DeliveryJob ], &block
     end
 
     # Asserts that no emails are enqueued for later delivery.
@@ -107,7 +107,7 @@ module ActionMailer
     #     end
     #   end
     def assert_no_enqueued_emails(&block)
-      assert_no_enqueued_jobs only: ActionMailer::DeliveryJob, &block
+      assert_no_enqueued_jobs only: [ ActionMailer::DeliveryJob, ActionMailer::Parameterized::DeliveryJob ], &block
     end
   end
 end
diff --git a/actionmailer/test/test_helper_test.rb b/actionmailer/test/test_helper_test.rb
index 31ac5a5211..876e9b0634 100644
--- a/actionmailer/test/test_helper_test.rb
+++ b/actionmailer/test/test_helper_test.rb
@@ -143,6 +143,16 @@ class TestHelperMailerTest < ActionMailer::TestCase
     end
   end
 
+  def test_assert_enqueued_parameterized_emails
+    assert_nothing_raised do
+      assert_enqueued_emails 1 do
+        silence_stream($stdout) do
+          TestHelperMailer.with(a: 1).test.deliver_later
+        end
+      end
+    end
+  end
+
   def test_assert_enqueued_emails_too_few_sent
     error = assert_raise ActiveSupport::TestCase::Assertion do
       assert_enqueued_emails 2 do
@@ -176,6 +186,14 @@ class TestHelperMailerTest < ActionMailer::TestCase
     end
   end
 
+  def test_assert_no_enqueued_parameterized_emails
+    assert_nothing_raised do
+      assert_no_enqueued_emails do
+        TestHelperMailer.with(a: 1).test.deliver_now
+      end
+    end
+  end
+
   def test_assert_no_enqueued_emails_failure
     error = assert_raise ActiveSupport::TestCase::Assertion do
       assert_no_enqueued_emails do