diff --git a/app/service/rest.py b/app/service/rest.py
index 99478ca7d..e0e1591fa 100644
--- a/app/service/rest.py
+++ b/app/service/rest.py
@@ -9,6 +9,7 @@ from notifications_utils.letter_timings import (
 from notifications_utils.timezones import convert_utc_to_bst
 from sqlalchemy.exc import IntegrityError
 from sqlalchemy.orm.exc import NoResultFound
+from werkzeug.datastructures import MultiDict
 
 from app.aws import s3
 from app.config import QueueNames
@@ -404,9 +405,15 @@ def get_service_history(service_id):
     return jsonify(data=data)
 
 
-@service_blueprint.route('/<uuid:service_id>/notifications', methods=['GET'])
+@service_blueprint.route('/<uuid:service_id>/notifications', methods=['GET', 'POST'])
 def get_all_notifications_for_service(service_id):
-    data = notifications_filter_schema.load(request.args).data
+    if request.method == 'GET':
+        data = notifications_filter_schema.load(request.args).data
+    elif request.method == 'POST':
+        # Must transform request.get_json() to MultiDict as NotificationsFilterSchema expects a MultiDict.
+        # Unlike request.args, request.get_json() does not return a MultiDict but instead just a dict.
+        data = notifications_filter_schema.load(MultiDict(request.get_json())).data
+
     if data.get('to'):
         notification_type = data.get('template_type')[0] if data.get('template_type') else None
         return search_for_notification_by_to_field(service_id=service_id,
diff --git a/tests/app/service/test_rest.py b/tests/app/service/test_rest.py
index c8c79a765..90cd27a9d 100644
--- a/tests/app/service/test_rest.py
+++ b/tests/app/service/test_rest.py
@@ -1710,6 +1710,64 @@ def test_get_all_notifications_for_service_in_order(notify_api, notify_db_sessio
         assert response.status_code == 200
 
 
+def test_get_all_notifications_for_service_in_order_with_post_request(client, notify_db_session):
+    service_1 = create_service(service_name="1")
+    service_2 = create_service(service_name="2")
+
+    service_1_template = create_template(service_1)
+    service_2_template = create_template(service_2)
+
+    # create notification for service_2
+    create_notification(service_2_template)
+
+    notification_1 = create_notification(service_1_template)
+    notification_2 = create_notification(service_1_template)
+    notification_3 = create_notification(service_1_template)
+
+    response = client.post(
+        path=f'/service/{service_1.id}/notifications',
+        data=json.dumps({}),
+        headers=[('Content-Type', 'application/json'), create_admin_authorization_header()])
+
+    resp = json.loads(response.get_data(as_text=True))
+    assert len(resp['notifications']) == 3
+    assert resp['notifications'][0]['to'] == notification_3.to
+    assert resp['notifications'][1]['to'] == notification_2.to
+    assert resp['notifications'][2]['to'] == notification_1.to
+    assert response.status_code == 200
+
+
+def test_get_all_notifications_for_service_filters_notifications_when_using_post_request(client, notify_db_session):
+    service_1 = create_service(service_name="1")
+    service_2 = create_service(service_name="2")
+
+    service_1_sms_template = create_template(service_1)
+    service_1_email_template = create_template(service_1, template_type=EMAIL_TYPE)
+    service_2_sms_template = create_template(service_2)
+
+    returned_notification = create_notification(service_1_sms_template, normalised_to='447700900855')
+
+    create_notification(service_1_sms_template, to_field='+447700900000', normalised_to='447700900000')
+    create_notification(service_1_sms_template, status='delivered', normalised_to='447700900855')
+    create_notification(service_1_email_template, normalised_to='447700900855')
+    # create notification for service_2
+    create_notification(service_2_sms_template)
+
+    auth_header = create_admin_authorization_header()
+    data = {'page': 1, 'template_type': ['sms'], 'status': ['created', 'sending'], 'to': '0855'}
+
+    response = client.post(
+        path=f'/service/{service_1.id}/notifications',
+        data=json.dumps(data),
+        headers=[('Content-Type', 'application/json'), auth_header])
+
+    resp = json.loads(response.get_data(as_text=True))
+    assert len(resp['notifications']) == 1
+    assert resp['notifications'][0]['to'] == returned_notification.to
+    assert resp['notifications'][0]['status'] == returned_notification.status
+    assert response.status_code == 200
+
+
 def test_get_all_notifications_for_service_formatted_for_csv(client, sample_template):
     notification = create_notification(template=sample_template)
     auth_header = create_admin_authorization_header()