diff --git a/LawFirm/LawFirm/Program.cs b/LawFirm/LawFirm/Program.cs
index ffbb533..439c111 100644
--- a/LawFirm/LawFirm/Program.cs
+++ b/LawFirm/LawFirm/Program.cs
@@ -79,7 +79,7 @@ namespace LawFirm
             DependencyManager.Instance.RegisterType<AbstractSaveToExcel, SaveToExcel>();
             DependencyManager.Instance.RegisterType<AbstractSaveToPdf, SaveToPdf>();
 
-			DependencyManager.Instance.RegisterType<AbstractMailWorker, MailKitWorker>();
+			DependencyManager.Instance.RegisterType<AbstractMailWorker, MailKitWorker>(isSingle: true);
 
 			DependencyManager.Instance.RegisterType<FormMain>();
             DependencyManager.Instance.RegisterType<FormBlank>();