diff --git a/config.py b/config.py
index e52b75d..f672974 100644
--- a/config.py
+++ b/config.py
@@ -32,14 +32,13 @@
 # user_id for anonymous users - fix in deployment config
 BOOTSTRAP_USER_ID = 0
 
+NECTAR_REFERRERS = ["dev.scixplorer.org"]
+
 # import endpoints
 HARBOUR_MYADS_IMPORT_ENDPOINT = 'https://api.adsabs.harvard.edu/v1/harbour/myads/classic/%s'
 MYADS_DAILY_TIME_RANGE = 2 # days
 MYADS_WEEKLY_TIME_RANGE = 6 # days
 
-# scixplorer host
-SCIXPLORER_HOST = 'scixplorer.org'
-
 # arXiv categories and sub-categories
 ALLOWED_ARXIV_CLASSES = ['astro-ph',
                          'astro-ph.GA', 'astro-ph.CO', 'astro-ph.EP', 'astro-ph.HE', 'astro-ph.IM', 'astro-ph.SR',
diff --git a/vault_service/tests/test_user.py b/vault_service/tests/test_user.py
index 0736cdf..61b87f7 100644
--- a/vault_service/tests/test_user.py
+++ b/vault_service/tests/test_user.py
@@ -944,7 +944,7 @@ def test_scixplorer_referrer_updates_all_notifications(self):
             self.assertFalse(notification1.scix_ui)
             self.assertFalse(notification2.scix_ui)
         
-        # Create a third notification WITH Scixplorer Host (query type)
+        # Create a third notification WITH Scixplorer Referrer (query type)
         r = self.client.post(
             url_for('user.myads_notifications'),
             data=json.dumps({
@@ -957,9 +957,9 @@ def test_scixplorer_referrer_updates_all_notifications(self):
             content_type='application/json',
             headers={
                 'Authorization': 'secret',
-                'X-api-uid': '42', 
-            },
-            environ_overrides={'HTTP_HOST': self.app.config['SCIXPLORER_HOST']}
+                'X-api-uid': '42',
+                'Referer': 'https://dev.scixplorer.org/search'
+            }
         )
         self.assertStatus(r, 200)
         self.assertTrue(r.json['name'] == 'Scixplorer Query')
@@ -974,5 +974,36 @@ def test_scixplorer_referrer_updates_all_notifications(self):
             self.assertTrue(notification2.scix_ui)
             self.assertTrue(notification3.scix_ui)
 
+        # Create a fourth notification WITHOUT Scixplorer Host (query type)
+        r = self.client.post(
+            url_for('user.myads_notifications'),
+            data=json.dumps({
+                'name': 'Scixplorer Query',
+                'qid': qid,
+                'stateful': True,
+                'frequency': 'daily',
+                'type': 'query'
+            }),
+            content_type='application/json',
+            headers={
+                'Authorization': 'secret',
+                'X-api-uid': '42', 
+            }
+        )
+        self.assertStatus(r, 200)
+        self.assertTrue(r.json['name'] == 'Scixplorer Query')
+        fourth_notification_id = r.json['id']
+
+        # Verify ALL notifications now have scix_ui=True
+        with self.app.session_scope() as session:
+            notification1 = session.query(MyADS).filter_by(id=first_notification_id).first()
+            notification2 = session.query(MyADS).filter_by(id=second_notification_id).first()
+            notification3 = session.query(MyADS).filter_by(id=third_notification_id).first()
+            notification4 = session.query(MyADS).filter_by(id=fourth_notification_id).first()
+            self.assertTrue(notification1.scix_ui)
+            self.assertTrue(notification2.scix_ui)
+            self.assertTrue(notification3.scix_ui)
+            self.assertTrue(notification4.scix_ui)
+
 if __name__ == '__main__':
     unittest.main()
diff --git a/vault_service/views/user.py b/vault_service/views/user.py
index cc8d2e7..b0ac6f2 100644
--- a/vault_service/views/user.py
+++ b/vault_service/views/user.py
@@ -294,7 +294,7 @@ def _create_myads_notification(payload=None, headers=None, user_id=None):
     except KeyError:
         return json.dumps({'msg': 'No notification type passed'}), 400
     
-    scix_ui_header = current_app.config['SCIXPLORER_HOST'] in request.headers.get('Host', '')
+    scix_ui_header = urlparse.urlparse(request.referrer).netloc in current_app.config.get("NECTAR_REFERRERS", ["dev.scixplorer.org"])
 
     with current_app.session_scope() as session:
         try:
@@ -407,15 +407,15 @@ def _create_myads_notification(payload=None, headers=None, user_id=None):
             # qid is an int in the myADS table
             myads_id = setup.id
             
-            # If user is coming from scixplorer but existing notifications don't have scix_ui set to True, update them
-            if scix_ui_header:
-                # Check if there are any of user's notifications with scix_ui=False
-                existing_notifications = session.query(MyADS).filter_by(user_id=user_id).filter_by(scix_ui=False).all()
-                current_app.logger.info(f'Total notifications to update: {len(existing_notifications)}')
-                if existing_notifications:
-                    for notification in existing_notifications:
-                        current_app.logger.info(f'Updating notification: {notification.id} for user: {user_id}')
-                        notification.scix_ui = True
+            # If scix_ui_header is True or any of the notifications have scix_ui=True, update all notifications to scix_ui=True
+            existing_notifications = session.query(MyADS).filter_by(user_id=user_id).all()
+            notifications_scix_ui_is_false = [notification for notification in existing_notifications if notification.scix_ui == False]
+            if scix_ui_header or (len(notifications_scix_ui_is_false) < len(existing_notifications)):
+                current_app.logger.info(f'Total notifications to update: {len(notifications_scix_ui_is_false)}')
+
+                for notification in notifications_scix_ui_is_false:
+                    current_app.logger.info(f'Updating notification: {notification.id} for user: {user_id}')
+                    notification.scix_ui = True
             
             session.commit()
         except exc.StatementError as e: