diff --git a/framework/src/Volo.Abp.Emailing/Volo/Abp/Emailing/AdditionalEmailSendingArgs.cs b/framework/src/Volo.Abp.Emailing/Volo/Abp/Emailing/AdditionalEmailSendingArgs.cs
index 98236d07d5..4de1eb6105 100644
--- a/framework/src/Volo.Abp.Emailing/Volo/Abp/Emailing/AdditionalEmailSendingArgs.cs
+++ b/framework/src/Volo.Abp.Emailing/Volo/Abp/Emailing/AdditionalEmailSendingArgs.cs
@@ -1,8 +1,10 @@
+using System;
 using System.Collections.Generic;
 using Volo.Abp.Data;
 
 namespace Volo.Abp.Emailing;
 
+[Serializable]
 public class AdditionalEmailSendingArgs
 {
     public List<string>? CC { get; set; }