uses
Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
Vcl.Controls, Vcl.Forms, Vcl.Dialogs, IdBaseComponent, IdComponent,
IdTCPConnection, IdTCPClient, IdExplicitTLSClientServerBase, IdMessageClient,
IdSMTPBase, IdSMTP, IdMessage, IdAttachment, IdAttachmentFile, Vcl.StdCtrls,
IdServerIOHandler, IdSSL, IdSSLOpenSSL, IdIOHandler, IdIOHandlerSocket,
IdIOHandlerStack;