diff --git a/ComputersShop/Program.cs b/ComputersShop/Program.cs
index 6bbafc9..1134116 100644
--- a/ComputersShop/Program.cs
+++ b/ComputersShop/Program.cs
@@ -64,7 +64,7 @@ namespace ComputersShop
             DependencyManager.Instance.RegisterType<IClientLogic, ClientLogic>();
             DependencyManager.Instance.RegisterType<IImplementerLogic, ImplementerLogic>();
             DependencyManager.Instance.RegisterType<IWorkProcess, WorkModeling>();
-            DependencyManager.Instance.RegisterType<AbstractMailWorker, MailKitWorker>();
+            DependencyManager.Instance.RegisterType<AbstractMailWorker, MailKitWorker>(isSingle: true);
             DependencyManager.Instance.RegisterType<IMessageInfoLogic, MessageInfoLogic>();
             DependencyManager.Instance.RegisterType<IBackUpLogic, BackUpLogic>();