邮件批量发送

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Net.Mail;
using System.Configuration;
using System.Collections;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
    public string mailContent ;
    protected void Page_Load(object sender, EventArgs e)
    {

    }

    public void Send()
    {
        MailMessage mail = new MailMessage();
        try
        {
            //设置邮件的标题
            mail.Subject = "悠哉WebService报告";
            mail.SubjectEncoding = System.Text.Encoding.UTF8;
            //设置邮件的发件人
            string SendEmail = ConfigurationManager.AppSettings["SendEmail"].ToString();
            MailAddress Addressfrom = new MailAddress(SendEmail, "uzai", System.Text.Encoding.UTF8); //邮件的发件人
            mail.From = Addressfrom;
            /*  这里这样写是因为可能发给多个联系人，每个地址用 , 号隔开
           */
            List<string> mailAddress = new List<string>();
            foreach (string address in mailAddress)
            {
                if (address != string.Empty)
                {
                    mail.To.Add(new MailAddress(address, address, System.Text.Encoding.UTF8));
                }
            }
            //设置邮件的内容
            mail.Body = mailContent;
            //设置邮件的格式
            mail.BodyEncoding = System.Text.Encoding.UTF8;
            //mail.IsBodyHtml = true;
            //设置邮件的发送级别
            mail.Priority = MailPriority.Normal;
            //发送通知
            mail.DeliveryNotificationOptions = DeliveryNotificationOptions.OnSuccess;
            SmtpClient client = new SmtpClient();
            //设置用于 SMTP 事务的主机的名称，填IP地址也可以了
            client.Host = "smtp.gmail.com";
            client.Port = 25;
            client.Timeout = 9999;
            client.UseDefaultCredentials = true;
            client.EnableSsl = true;
            //邮箱登陆名和密码
            string EmailLogName = ConfigurationManager.AppSettings["EmailLogName"].ToString();
            string EmailLogPwd = ConfigurationManager.AppSettings["EmailLogPwd"].ToString();
            client.Credentials = new System.Net.NetworkCredential(EmailLogName, EmailLogPwd);
            client.DeliveryMethod = SmtpDeliveryMethod.Network;
            //发送email
            client.Send(mail);
        }
        catch (Exception)
        {
            //当邮件发送失败，发送异常时 使用备用方法调用备用邮箱发送
            SendBackUp();
        }
        finally
        {
            mail.Dispose();
        }
    }
    public void SendBackUp()
    {
        MailMessage mail = new MailMessage();
        try
        {
            //设置邮件的标题
            mail.Subject = "悠哉WebService报告";
            mail.SubjectEncoding = System.Text.Encoding.UTF8;
            //设置邮件的发件人
            string SendEmail = System.Configuration.ConfigurationManager.AppSettings["SendEmail"].ToString();
            MailAddress Addressfrom = new MailAddress(SendEmail, "uzai", System.Text.Encoding.UTF8); //邮件的发件人
            mail.From = Addressfrom;
            /*  这里这样写是因为可能发给多个联系人，每个地址用 , 号隔开
           */
            List<string> mailAddress = new List<string>();
            foreach (string address in mailAddress)
            {
                if (address != string.Empty)
                {
                    mail.To.Add(new MailAddress(address, address, System.Text.Encoding.UTF8));
                }
            }
            //设置邮件的内容
            mail.Body = mailContent;
            //设置邮件的格式
            mail.BodyEncoding = System.Text.Encoding.UTF8;
            //mail.IsBodyHtml = true;
            //设置邮件的发送级别
            mail.Priority = MailPriority.Normal;
            //发送通知
            mail.DeliveryNotificationOptions = DeliveryNotificationOptions.OnSuccess;
            SmtpClient client = new SmtpClient();
            //设置用于 SMTP 事务的主机的名称，填IP地址也可以了
            client.Host = "smtp.gmail.com";
            client.Port = 25;
            client.Timeout = 9999;
            client.UseDefaultCredentials = true;
            client.EnableSsl = true;
            //邮箱登陆名和密码
            string EmailLogName = ConfigurationManager.AppSettings["EmailLogName"].ToString();
            string EmailLogPwd = ConfigurationManager.AppSettings["EmailLogPwd"].ToString();
            client.Credentials = new System.Net.NetworkCredential(EmailLogName, EmailLogPwd);
            client.DeliveryMethod = SmtpDeliveryMethod.Network;
            //发送email
            client.Send(mail);
        }
        catch (Exception)
        {
            //当邮件发送失败，发送异常时 使用备用方法调用备用邮箱发送
            Send();
        }
        finally
        {
            mail.Dispose();
        }
    }
}