報錯誤：郵箱不可用。 服務器響應為: 5.7.1 Unable to relay for cpjhz1261986@126.com代碼段：//發(fā)送郵件            SmtpClient sc = new SmtpClient();            sc.Host = "192.168.1.101";            sc.Credentials = new NetworkCredential("begin2010cpj@sina.com", "begin2010-cpj");            sc.Send(mailObj);            Lab.Text = "發(fā)送完畢!";急需解決?。?！