邮件发送封装方法

/// <summary>
        /// 发送邮件
        /// </summary>
        /// <param name="subject">标题</param>
        /// <param name="body">内容</param>
        /// <param name="to">收件人</param>
        /// <param name="filePaths">附件路径</param>
        /// <param name="cc">抄送人</param>
        public static void SendMail(string subject, string body, List<string> to, List<string> filePaths = null, List<string> cc = null)
        {
            string host = ConfigurationManager.AppSettings["Smtp.Host"];
            string port = ConfigurationManager.AppSettings["Smtp.Port"] ?? "25";
            string account = ConfigurationManager.AppSettings["Smtp.Account"];
            string password = ConfigurationManager.AppSettings["Smtp.Password"];
            string from = ConfigurationManager.AppSettings["Smtp.From"];
            string EnableSsl = ConfigurationManager.AppSettings["EnableSsl"] ?? "false";

            SmtpClient client = new SmtpClient(host, Convert.ToInt32(port));
            client.DeliveryMethod = SmtpDeliveryMethod.Network;
            client.Credentials = new NetworkCredential(account, password);

            client.EnableSsl = Convert.ToBoolean(EnableSsl);

            MailMessage mailMessage = new MailMessage() { From = new MailAddress(from) };
            if (filePaths != null)
            {
                foreach (var path in filePaths)
                {
                    System.Net.Mail.Attachment attach = new System.Net.Mail.Attachment(path);
                    mailMessage.Attachments.Add(attach);
                }
            }

            mailMessage.Subject = subject;    //主题
            mailMessage.Body = body;    //正文

            foreach (var addr in to)
            {
                //收件人邮箱地址
                mailMessage.To.Add(new MailAddress(addr));
            }

            if (cc != null)
            {
                foreach (string addr in cc)
                {
                    mailMessage.CC.Add(addr);
                }
            }

            mailMessage.SubjectEncoding = System.Text.Encoding.UTF8;
            mailMessage.BodyEncoding = System.Text.Encoding.UTF8;
            mailMessage.IsBodyHtml = true;

            client.Timeout = 10000;
            client.Send(mailMessage);

        }