diff --git a/vnpy/trader/util_mail.py b/vnpy/trader/util_mail.py
index c318c17a..9b55dd3e 100644
--- a/vnpy/trader/util_mail.py
+++ b/vnpy/trader/util_mail.py
@@ -63,7 +63,7 @@ class mail_thread(Thread):
             # print '发送成功'
         except Exception as e:
             #pass
-            print str(e)
+            print( str(e))
         print("mail sent successful!")
 
         time.sleep(5)