diff --git a/framework/src/Volo.Abp.Emailing/Volo/Abp/Emailing/EmailSenderBase.cs b/framework/src/Volo.Abp.Emailing/Volo/Abp/Emailing/EmailSenderBase.cs
index b278d70d16..b0c572f0e4 100644
--- a/framework/src/Volo.Abp.Emailing/Volo/Abp/Emailing/EmailSenderBase.cs
+++ b/framework/src/Volo.Abp.Emailing/Volo/Abp/Emailing/EmailSenderBase.cs
@@ -69,7 +69,7 @@ namespace Volo.Abp.Emailing
             );
         }
 
-        public async Task QueueAsync(string from, string to, string subject, string body, bool isBodyHtml = true)
+        public virtual async Task QueueAsync(string from, string to, string subject, string body, bool isBodyHtml = true)
         {
             if (!BackgroundJobManager.IsAvailable())
             {