procedure TForm1.FormCreate(Sender: TObject);

begin

  try

    IdSMTP1.AuthenticationType := atLogin;

    IdSMTP1.Host := 'smtp.qq.com';

    IdSMTP1.Username := 'test@qq.com';        //qq邮箱

    IdSMTP1.Password := 'tjlhnnajvwrgbifca';  //授权码

    IdSMTP1.Port := 25;

    IdSMTP1.Connect(3000);

    IdSMTP1.Authenticate;

    IdMessage1.Subject := '测试邮件';

    IdMessage1.From.Address := 'test@qq.com';

    IdMessage1.Recipients.EMailAddresses := 'test@foxmail.com';

    IdMessage1.Body.Text := 'hello kkkkkkkkkkkkkk';

    IdSMTP1.Send(IdMessage1);

  except

    on e: Exception do

    ShowMessage(e.Message);

  end;

end;