C# 邮件发送

在C#中，编写代码，发送邮件。

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.Text;
using System.Windows.Forms;
using System.Net.Configuration;
using System.Configuration;
using System.Web.Configuration;

namespace SendMailTest
{
    public partial class SendMail : System.Web.UI.Page
    {
         protected void Page_Load(object sender, EventArgs e)
        {
            List<string> receiveMailAddressList = initReceiveMailAddress();
            SendMailMessage(receiveMailAddressList);
        }

        /// <summary>
        /// 初始化收件人的邮件地址
        /// </summary>
        /// <returns></returns>      
　　　private static List<string> initReceiveMailAddress()
        {
            List<string> receiveMailAddressList = new List<string>();
            receiveMailAddressList.Add("chaii@.cn");
            receiveMailAddressList.Add("liu@111.cn");
            receiveMailAddressList.Add("song@222t.cn");
            return receiveMailAddressList;      

        }

        /// <summary>
        /// 发送邮件消息
        /// </summary>
        public static void SendMailMessage(List<string> receiveMailAddressList)
        {
            if (receiveMailAddressList != null && receiveMailAddressList.Count > 0)
            {
                MailMessage mailMessage = new MailMessage();
                //设置发件人的邮件地址
                MailAddress senderMailAddress = new MailAddress("chai@.cn");
                //添加发件人的邮件地址
                mailMessage.From = senderMailAddress;              

               //添加收件人的邮件地址
                foreach (string mailAddress in receiveMailAddressList)
                {
                    MailAddress receiveMailAddress = new MailAddress(mailAddress);
                    mailMessage.To.Add(receiveMailAddress);
                }

                //设置邮件的主题
                mailMessage.Subject = "邮件订阅测试";
                mailMessage.SubjectEncoding = Encoding.UTF8;

                //设置邮件的正文
                mailMessage.Body = "测试一下邮件群发的功能，别紧张@";
                mailMessage.BodyEncoding = Encoding.UTF8;
                mailMessage.IsBodyHtml = true;

                //设置邮件的优先级别
                mailMessage.Priority = MailPriority.High;          
               //读取WebConfig配置文件中的数据
                Configuration config = WebConfigurationManager.OpenWebConfiguration(HttpContext.Current.Request.ApplicationPath);
                MailSettingsSectionGroup settings = (MailSettingsSectionGroup)config.GetSectionGroup("system.net/mailSettings");

                //发送电子邮件
                SmtpClient smtpClient = new SmtpClient();
                //设置用于 SMTP 事务的主机的名称，填IP地址也可以了
                smtpClient.Host = settings.Smtp.Network.Host;
                //设置用于 SMTP 事务的端口，默认的是 25
                smtpClient.Port = settings.Smtp.Network.Port;
                //设置登录邮箱的用户名和密码
                smtpClient.Credentials = new System.Net.NetworkCredential(settings.Smtp.Network.UserName,
settings.Smtp.Network.Password);
                //指定如何处理待发的电子邮件,电子邮件通过网络发送到 SMTP 服务器
                smtpClient.DeliveryMethod = SmtpDeliveryMethod.Network;
                //是否使用安全套接字层 (SSL) 加密连接
                smtpClient.EnableSsl = settings.Smtp.Network.EnableSsl;
                //发送电子邮件
                try
                {
                    smtpClient.Send(mailMessage);
                    MessageBox.Show("您的邮件已发送成功", "发送成功");
                }
                catch (System.Net.Mail.SmtpException ex)
                {
                    MessageBox.Show(ex.Message, "发送失败");
                }
            }
        }  
}
}