diff --git a/api/settings.py b/api/settings.py
index e08ffe31..9f881aba 100644
--- a/api/settings.py
+++ b/api/settings.py
@@ -21,7 +21,7 @@ BASE_DIR = Path(__file__).resolve().parent.parent
 SECRET_KEY = 'django-insecure-_u202k$8qq2p*cr_eo(7k!0ngr5^n)27@85+5oy8&41(u6&j54'
 
 # SECURITY WARNING: don't run with debug turned on in production!
-DEBUG = True
+DEBUG = False
 
 ALLOWED_HOSTS = ['*']
 
@@ -79,7 +79,7 @@ ASGI_APPLICATION = 'api.asgi.application'
 # https://docs.djangoproject.com/en/4.1/ref/settings/#databases
 #prod:5.223.52.193      dev:5.223.42.146
 
-MODE = 'dev'  
+MODE = 'prod'  
 DBHOST = '138.199.203.34' if MODE == 'prod' else '138.199.203.34'
 
 DATABASES = {
diff --git a/app/email.py b/app/email.py
index c5dad27e..1bb93c8e 100644
--- a/app/email.py
+++ b/app/email.py
@@ -145,7 +145,7 @@ def send_email(request):
       sender = request.data.get('sender')
   
   # send email
-  result = send_via_zeptomail(receiver, subject, content, sender)
+  result = send_one_by_one(receiver, subject, content, sender)
 
   if result:
     return Response({'message': 'Send success'}, status=200)