procedure TMainForm.SpeedButton1Click(Sender: TObject);
begin
    NMSMTP1.UserID:='xswgxnn';
    NMSMTP1.Host:='Smtp.163.com';//指定邮件服务器地址
    NMSMTP1.Port:=25;//端口  Try
    if NMSMTP1.Connected then NMSMTP1.Disconnect;
    NMSMTP1.Connect;
      NMSMTP1.PostMessage.Body.Clear;
      NMSMTP1.PostMessage.Attachments.Clear;
      NMSMTP1.PostMessage.ToAddress.Clear;      NMSMTP1.PostMessage.FromAddress:=MailFrom;//发件人地址
      NMSMTP1.PostMessage.FromName:=MailName;//发件人姓名
      NMSMTP1.PostMessage.Subject:='测试中'; //邮件主题
      NMSMTP1.PostMessage.ToAddress.Add('[email protected]'); //收件人
      //正文信息
      NMSMTP1.PostMessage.Body.Assign(Memo_EMtext.Lines);
      NMSMTP1.SendMail;//发送邮件
    end;
    if NMSMTP1.Connected then NMSMTP1.Disconnect ;
    Gauge1.Visible:=False;
  Except
    ON E:exception do
      Statusbar1.Panels[1].Text:='发送邮件失败!返回错误:'+E.Message;
  End;
end;然后总是弹出"5533 you are not authrized to send as <Mail Form:<[email protected]>> authentication is required“  的信息,这应该是服务器要验证密码!可是密码怎么写?请高手指导!