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const
 wm_sendMail = wm_user +1;
type
  TMDIClient = class(TForm)
  private
    { Private-Deklarationen }
    MasterWindow:Hwnd;
  public
    { Public-Deklarationen }
    constructor Create(AOwner:TComponent;AMasterWindow:Hwnd);reintroduce;
    procedure WMSendMail(var Msg:TMessage);Message wm_SendMail;
  end;


constructor TMDIClient.Create;
begin
  Inherited Create(Aowner);
  MasterWIndow:= AMasterWindow;
end;


procedure TMDIClient.WMPrintItem(var Msg: TMessage);
begin
  PostMessage(MasterWindow,wm_sendmail,0,0);
end;                    

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... 
TMDIClient.Create(self,Self.Handle);
...