465端口發送郵件

2017年買的阿里雲服務器 客服說暫停25端口郵件的發送  只能改為465，這樣就遇到了用web.mail 引用發送郵件
只能吧版本降到4.0


public static void SendEmail(string subject, string body, string mailTo, List<string> mailCC, List<string> attachmentUrls)
        {
            MailMessage mmsg = new MailMessage();
            //驗證   
            mmsg.Subject = subject;// "zhuti1";//郵件主題

            mmsg.BodyFormat = MailFormat.Html;
            mmsg.Body = body;// "wqerwerwerwer";//郵件正文
            mmsg.BodyEncoding = Encoding.UTF8;//正文編碼

            mmsg.Priority = MailPriority.High;//優先級

            mmsg.From = "[e-mail]";//發件者郵箱地址
            mmsg.To = mailTo;//收件人收箱地址
            StringBuilder mailCCString = new StringBuilder();

            foreach (var cc in mailCC)
            {
                mailCCString.Append(cc + ";");
            }
            mmsg.Cc = mailCCString.ToString();

            foreach (var attachmentUrl in attachmentUrls)
            {
                MailAttachment oAttch = new MailAttachment(attachmentUrl, MailEncoding.Base64);

                mmsg.Attachments.Add(oAttch);

            }

            mmsg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");
            //登陸名   
            mmsg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", "[e-mail]");
            //登陸密碼   
            mmsg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", "登陸密碼  ");

            mmsg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpserverport", 465);//端口  
            mmsg.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpusessl", "true");
            System.Web.Mail.SmtpMail.SmtpServer = "smtp.163.com";    //企業賬號用smtp.exmail.qq.com  

            SmtpMail.Send(mmsg);
        }

 

 

 string topic = "測試郵件topic";
            List<string> attachmentUrls = new List<string> { "E:\\附件.txt" };
            string body = "一封含附件的測試郵件";// "<h1>一封含附件的測試郵件</h1>";


            ClassLibrary1.MailSenderHelper.SendEmail(topic, body, "[e-mail]", new List<string> { "[e-mail]" }, attachmentUrls);
            Console.WriteLine("發送成功");
            Console.ReadLine();