diff --git a/aspnet-core/modules/platform/LINGYUN.Platform.Domain/LINGYUN/Platform/Messages/EmailMessageManager.cs b/aspnet-core/modules/platform/LINGYUN.Platform.Domain/LINGYUN/Platform/Messages/EmailMessageManager.cs
index fc47ebc0c..ba221e601 100644
--- a/aspnet-core/modules/platform/LINGYUN.Platform.Domain/LINGYUN/Platform/Messages/EmailMessageManager.cs
+++ b/aspnet-core/modules/platform/LINGYUN.Platform.Domain/LINGYUN/Platform/Messages/EmailMessageManager.cs
@@ -1,7 +1,6 @@
 using Microsoft.Extensions.Logging;
 using System;
 using System.IO;
-using System.Net;
 using System.Net.Mail;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;