diff --git a/IRaCIS.Core.Application/Helper/SendEmailHelper.cs b/IRaCIS.Core.Application/Helper/SendEmailHelper.cs
index 30eecfbbc..1fc71d559 100644
--- a/IRaCIS.Core.Application/Helper/SendEmailHelper.cs
+++ b/IRaCIS.Core.Application/Helper/SendEmailHelper.cs
@@ -21,7 +21,7 @@ public static class SendEmailHelper
 
             smtp.ServerCertificateValidationCallback = (s, c, h, e) => true;
 
-            await smtp.ConnectAsync("smtp.163.com", 465, SecureSocketOptions.StartTls);
+            await smtp.ConnectAsync("smtp.163.com", 465, SecureSocketOptions.SslOnConnect);
 
             await smtp.AuthenticateAsync("iracis_grr@163.com", "XLWVQKZAEKLDWOAH");