diff --git a/apps/notification/backend/application/tenant_notification_hub.py b/apps/notification/backend/application/tenant_notification_hub.py
index f4ebd45..00a8bef 100644
--- a/apps/notification/backend/application/tenant_notification_hub.py
+++ b/apps/notification/backend/application/tenant_notification_hub.py
@@ -6,7 +6,7 @@ from common.exception.exceptions import InvalidDataError
 from backend.business.tenant_notification_manager import TenantNotificationManager
 from backend.application.template_message_hub import TemplateMessageHub
 from backend.application.email_sender_hub import EmailSenderHub
-
+from backend.models.constants import NotificationConstants
 
 class TenantNotificationHub:
     def __init__(self):
@@ -14,6 +14,7 @@ class TenantNotificationHub:
         self.template_message_hub = TemplateMessageHub()
         self.email_sender_hub = EmailSenderHub()
         self.module_logger = ModuleLogger(sender_id="TenantNotificationHub")
+        self.notification_constants = NotificationConstants()
 
     async def send_tenant_email(
         self,
@@ -41,23 +42,23 @@ class TenantNotificationHub:
             )
             
             # 3. get tenant email senders
+            default_sender_email = self.notification_constants.DEFAULT_EMAIL_SENDER
             if sender_emails is None:
-                # TODO: use default email sender directly 
                 tenant_email_senders = await self.email_sender_hub.get_email_senders(tenant_id)
                 if not tenant_email_senders:
-                    sender_emails = ["support@freeleaps.com"]
+                    sender_emails = [default_sender_email]
                     await self.module_logger.log_info(
                         "Using default email sender for tenant",
                         properties={
                             "tenant_id": tenant_id,
-                            "default_sender": "support@freeleaps.com"
+                            "default_sender": default_sender_email
                         }
                     )
                 else:
                     sender_emails = tenant_email_senders
             
             # 4. check if sender_emails are valid
-            if sender_emails != ["support@freeleaps.com"]: 
+            if sender_emails != [default_sender_email]: 
                 tenant_senders = await self.email_sender_hub.get_email_senders(tenant_id)
                 invalid_senders = [email for email in sender_emails if email not in tenant_senders]
                 if invalid_senders:
diff --git a/apps/notification/backend/models/constants.py b/apps/notification/backend/models/constants.py
index d8ff9ad..7702cb4 100644
--- a/apps/notification/backend/models/constants.py
+++ b/apps/notification/backend/models/constants.py
@@ -125,3 +125,12 @@ SystemNotifications = {
         },
     },
 }
+
+class NotificationConstants:
+    DEFAULT_EMAIL_SENDER: str = "support@freeleaps.com"
+
+    class Settings:
+        name = "notification_constants"
+        indexes = [
+            "DEFAULT_EMAIL_SENDER"
+            ]