急布置服务器后，发送邮件失败，求大侠赐教哈，服务器是server 2008

            string fromAddress = "***@gmail.com";            System.Net.Mail.MailMessage msg = new System.Net.Mail.MailMessage();            msg.To.Add(targetAddress);            msg.From = new System.Net.Mail.MailAddress(fromAddress,"***");            msg.BodyEncoding = System.Text.Encoding.UTF8;            /* 上面3个参数分别是发件人地址（可以随便写），发件人姓名，编码*/            msg.Subject = title;//邮件标题             msg.SubjectEncoding = System.Text.Encoding.UTF8;//邮件标题编码             msg.Body = content;//邮件内容             msg.BodyEncoding = System.Text.Encoding.UTF8;//邮件内容编码             msg.IsBodyHtml = true;//是否是HTML邮件             msg.Priority = System.Net.Mail.MailPriority.High;//邮件优先级             System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient();            client.Credentials = new System.Net.NetworkCredential(fromAddress, "***");            //上述写你的GMail邮箱和密码             client.Port = 587;//Gmail使用的端口             client.Host = "smtp.gmail.com";            client.EnableSsl = true;//经过ssl加密             object userState = msg;            client.SendAsync(msg, userState);