/// <summary>     /// NetMail方式测试通过     /// </summary>     private void TestSend()     {         System.Net.Mail.MailMessage mm = new System.Net.Mail.MailMessage();         //收件人地址         mm.To.Add(new System.Net.Mail.MailAddress("xxxxxx@163.com", "Name"));         //发件人地址         mm.From = new System.Net.Mail.MailAddress("xxxxx@sina.com");         //这个可以不指定         //mm.Sender = new System.Net.Mail.MailAddress("xxx@sina.com", "SenderName");、         mm.Subject = "This is Test Email";         mm.Body = "<h3>This is Testing SMTP Mail Send By Me</h3>";         mm.IsBodyHtml = true;         mm.Priority = System.Net.Mail.MailPriority.High; // 设置发送邮件的优先级         System.Net.Mail.SmtpClient smtCliend = new System.Net.Mail.SmtpClient();         //指定邮件服务器         smtCliend.Host = "smtp.sina.com";         //smtp邮件服务器的端口号          smtCliend.Port = 25;           //设置发件人邮箱的用户名和地址，使用公共邮件服务器一般需要提供，不然发送不会成功         smtCliend.Credentials = new NetworkCredential("xxxxxxx", "xxxxxxx");         //指定邮件的发送方式         smtCliend.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;         try         {             smtCliend.Send(mm);         }         catch (System.Net.Mail.SmtpException ex)         {             Response.Write(ex.Message);         }         catch (Exception ex)         {             Response.Write(ex.Message);         }     }