diff --git a/app/celery/tasks.py b/app/celery/tasks.py
index d03d08e43..616d9ee77 100644
--- a/app/celery/tasks.py
+++ b/app/celery/tasks.py
@@ -43,6 +43,7 @@ from app.dao.notifications_dao import (
     dao_get_notification_history_by_reference,
 )
 from app.dao.provider_details_dao import get_provider_details_by_notification_type
+from app.dao.returned_letters_dao import insert_or_update_returned_letters
 from app.dao.service_email_reply_to_dao import dao_get_reply_to_by_id
 from app.dao.service_inbound_api_dao import get_service_inbound_api_for_service
 from app.dao.service_sms_sender_dao import dao_get_service_sms_senders_by_id
@@ -619,6 +620,8 @@ def process_returned_letters_list(notification_references):
         {"status": NOTIFICATION_RETURNED_LETTER}
     )
 
+    insert_or_update_returned_letters(notification_references)
+
     current_app.logger.info(
         "Updated {} letter notifications ({} history notifications, from {} references) to returned-letter".format(
             updated, updated_history, len(notification_references)
diff --git a/tests/app/celery/test_tasks.py b/tests/app/celery/test_tasks.py
index 515ef5f8c..698e61e74 100644
--- a/tests/app/celery/test_tasks.py
+++ b/tests/app/celery/test_tasks.py
@@ -44,6 +44,7 @@ from app.models import (
     JOB_STATUS_IN_PROGRESS,
     LETTER_TYPE,
     SMS_TYPE,
+    ReturnedLetter
 )
 
 from tests.app import load_example_csv
@@ -1626,3 +1627,15 @@ def test_process_returned_letters_list_updates_history_if_notification_is_alread
 
     assert [n.status for n in notifications] == ['returned-letter', 'returned-letter']
     assert all(n.updated_at for n in notifications)
+
+
+def test_process_returned_letters_populates_returned_letters_table(
+        sample_letter_template
+):
+    create_notification_history(sample_letter_template, reference='ref1')
+    create_notification_history(sample_letter_template, reference='ref2')
+
+    process_returned_letters_list(['ref1', 'ref2', 'unknown-ref'])
+
+    returned_letters = ReturnedLetter.query.all()
+    assert len(returned_letters) == 2