diff --git a/app/v2/notifications/post_notifications.py b/app/v2/notifications/post_notifications.py
index 7e39ad116..3af8db0b0 100644
--- a/app/v2/notifications/post_notifications.py
+++ b/app/v2/notifications/post_notifications.py
@@ -265,12 +265,6 @@ def process_letter_notification(*, letter_data, api_key, template, reply_to_text
                 [str(notification.id)],
                 queue=QueueNames.CREATE_LETTERS_PDF
             )
-    elif (api_key.service.research_mode and
-          current_app.config['NOTIFY_ENVIRONMENT'] in ['preview', 'development']):
-        create_fake_letter_response_file.apply_async(
-            (notification.reference,),
-            queue=QueueNames.RESEARCH_MODE
-        )
     else:
         if precompiled and api_key.key_type == KEY_TYPE_TEST:
             filename = upload_letter_pdf(notification, letter_content)
@@ -281,6 +275,14 @@ def process_letter_notification(*, letter_data, api_key, template, reply_to_text
                 kwargs={'filename': filename},
                 queue=QueueNames.ANTIVIRUS,
             )
+        elif (
+            api_key.service.research_mode and
+            current_app.config['NOTIFY_ENVIRONMENT'] in ['preview', 'development']
+        ):
+            create_fake_letter_response_file.apply_async(
+                (notification.reference,),
+                queue=QueueNames.RESEARCH_MODE
+            )
         else:
             update_notification_status_by_reference(notification.reference, NOTIFICATION_DELIVERED)
 
diff --git a/tests/app/v2/notifications/test_post_letter_notifications.py b/tests/app/v2/notifications/test_post_letter_notifications.py
index 851cf2e3c..bfcf85ccf 100644
--- a/tests/app/v2/notifications/test_post_letter_notifications.py
+++ b/tests/app/v2/notifications/test_post_letter_notifications.py
@@ -393,12 +393,15 @@ def test_post_letter_notification_is_delivered_if_in_trial_mode_and_using_test_k
     assert not fake_create_letter_task.called
 
 
+@pytest.mark.parametrize('is_research_mode', [True, False])
 def test_post_letter_notification_is_delivered_and_has_pdf_uploaded_to_test_letters_bucket_using_test_key(
     client,
     notify_user,
-    mocker
+    mocker,
+    is_research_mode
 ):
-    sample_letter_service = create_service(service_permissions=['letter', 'precompiled_letter'])
+    sample_letter_service = create_service(
+        service_permissions=['letter', 'precompiled_letter'], research_mode=is_research_mode)
     s3mock = mocker.patch('app.v2.notifications.post_notifications.upload_letter_pdf', return_value='test.pdf')
     mocker.patch('app.v2.notifications.post_notifications.pdf_page_count', return_value=1)
     mock_celery = mocker.patch("app.letters.rest.notify_celery.send_task")