uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs,    WinSock , Registry, StdCtrls, IdBaseComponent, IdComponent,
  IdTCPConnection, IdTCPClient, IdExplicitTLSClientServerBase, IdMessageClient,
  IdSMTPBase, IdSMTP, IdPOP3, IdMessage, IdCustomTCPServer, IdTCPServer,
  IdCmdTCPServer, IdSMTPServer, ExtCtrls;