用多线程发送邮箱（一次给一个用户发送N封邮件）

前台不用写，后台执行方法就可以了。

namespace SendMail
{
    public partial class SendMail_Page : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!IsPostBack)
            {
                ThStart();
            }
        }
        public Thread[] threads = new Thread[5];
        //开启线程
        public void ThStart()
        {
            ThreadStart thsrt = new ThreadStart(SendMail);
            //循环5个线程  
            for (int i = 0; i < 5; i++)
            {
                threads[i] = new Thread(thsrt);
                threads[i].IsBackground = true;
            }
            //循环遍历所有的5个线程  
            foreach (Thread th in threads)
            {
                th.Start();
            }
        }

        public void SendMail()
        {
            try
            {
                System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient();
                client.Host = "smtp.qq.com";//qq郵箱用這個，網易的就用smtp.126.com,看情況而定
                client.UseDefaultCredentials = false;
                client.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;
                client.Credentials = new System.Net.NetworkCredential("發送郵箱", "郵箱密碼");//驗證發送郵箱和這個一樣不
                System.Net.Mail.MailMessage Message = new System.Net.Mail.MailMessage();
                Message.From = new System.Net.Mail.MailAddress("發送郵箱");
                Message.To.Add("接收郵箱");
                       
                Message.Subject = "用戶測試";
                Message.Body = "主題——測試——郵箱發送";
                Message.SubjectEncoding = System.Text.Encoding.UTF8;
                Message.BodyEncoding = System.Text.Encoding.UTF8;
                Message.Priority = System.Net.Mail.MailPriority.High;
                Message.IsBodyHtml = true;
                client.Send(Message);
                Thread.Sleep(1000);
            }
            catch (Exception)
            {  
                //循环遍历所有的5个线程  
                foreach (Thread th in threads)
                {
                    //中止线程  
                    th.Abort();
                }
            }
        }
    }
}