diff --git a/api/extensions/ext_mail.py b/api/extensions/ext_mail.py
index ab55cfb286f467..10d0ee52fefae3 100644
--- a/api/extensions/ext_mail.py
+++ b/api/extensions/ext_mail.py
@@ -87,7 +87,7 @@ def send(self, to: str, subject: str, html: str, from_: Optional[str] = None):
 
 
 def is_enabled() -> bool:
-    return dify_config.MAIL_TYPE
+    return dify_config.MAIL_TYPE is not None
 
 
 def init_app(app: DifyApp):