.Net发送邮件异常：邮件发送失败 send Mail Faild

修改邮件发送代码时莫名其妙报错，原因是net的邮件发送封装未自动指向Tls12，显示邮件发送异常，如下图所示

 

 

 

我的解决方法是在邮件发送方法的最前方加入以下代码

System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12;

 

下面附整段邮件发送代码

public bool SendEmail(string email)//收件人
        {
            System.Net.ServicePointManager.SecurityProtocol = System.Net.SecurityProtocolType.Tls12;//配置ssl
            string Email = WebConfigurationManager.AppSettings["Email"].ToString();//发送邮件的邮箱
            string Emailpwd = WebConfigurationManager.AppSettings["Emailpwd"].ToString();//邮箱密码
            string Host = WebConfigurationManager.AppSettings["HostEmail"].ToString();//邮箱服务器
            string Port = WebConfigurationManager.AppSettings["Port"].ToString();//服务器端口号



            // 邮件服务设置
            SmtpClient smtpClient = new SmtpClient();
            smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;//指定电子邮件发送方式
            smtpClient.Host = Host; //指定SMTP服务器
            smtpClient.Port = Convert.ToInt32(Port);
            smtpClient.EnableSsl = true;
            smtpClient.Credentials = new System.Net.NetworkCredential(Email, Emailpwd);//用户名和密码

            // 发送邮件设置        
            MailMessage mailMessage = new MailMessage(Email, email); // 发送人和收件人
            mailMessage.Subject = "test1111";//主题
            mailMessage.Body = "test1111";//内容
            mailMessage.BodyEncoding = Encoding.UTF8;//正文编码
            mailMessage.IsBodyHtml = true;//设置为HTML格式
            mailMessage.Priority = MailPriority.Low;//优先级


            try
            {
                smtpClient.Send(mailMessage); // 发送邮件
                return true;
            }
            catch (Exception ex)
            {
                return false;
            }