需要一个群发邮件的代码

希望能有细一点的注释.谢谢了 --------------------编程问答-------------------- SmtpClient mailServer = new SmtpClient();
mailServer.Host = Host;
mailServer.Port = Port;
mailServer.EnableSsl = EnableSsl;
mailServer.UseDefaultCredentials = false;
mailServer.Credentials = new NetworkCredential(UID, PWD);
mailServer.Timeout = Timeout;
mailServer.Timeout = Timeout;

MailAddress from = new MailAddress(姓名<電子郵件>);
MailAddress to = new MailAddress(姓名<電子郵件>;姓名<電子郵件>);
MailMessage message = new MailMessage(from, to);
message.Subject = email.Subject;
message.CC.Add(姓名<電子郵件>;姓名<電子郵件>);
message.Bcc.Add(姓名<電子郵件>;姓名<電子郵件>);
message.Body = email.Body;
foreach (string atta in attas)
{
Attachment attachment = new Attachment(atta);
message.Attachments.Add(attachment);
}
message.SubjectEncoding = ConfigManager.MailEncoding;
message.BodyEncoding = ConfigManager.MailEncoding;
message.IsBodyHtml = true;
try
{
mailServer.Send(_message); --------------------编程问答-------------------- 利用JMAIL组件吧，很不错的说

  然后在类中using   jamil;
  然后声明
  jmail.MessageClass   MsgMail   =   new   jmail.MessageClass();

  MsgMail.Logging   =   true;
  MsgMail.Silent   =   true;
  MsgMail.Charset   =   "GB2312";                                                                                                                       //设置邮件的编码方式
  MsgMail.Encoding   =   "Base64";                                                                                                                     //设置邮件的附件编码方式
  MsgMail.ISOEncodeHeaders   =   false;                                                                                                           //是否将信头编码成iso-8859-1字符集
  MsgMail.From   =   "签名，显示是谁发的";
  MsgMail.FromName   =   "发送邮件的邮箱的用户名,显示是哪个邮箱发的";
  MsgMail.MailServerUserName   =   "发送邮件的邮箱的用户名";
  MsgMail.MailServerPassWord   =   "发送邮件的邮箱密码";
  //加收件人
  MsgMail.AddRecipient("收件人的地址，可添加多个，重复调用就可以了",null,null);

  //加抄送人
  MsgMail.AddRecipientCC("收件人的地址，可添加多个，重复调用就可以了",null,null);

  //加暗送人
  MsgMail.AddRecipientBCC("收件人的地址，可添加多个，重复调用就可以了",null);

  MsgMail.Subject   =   "标题";
  MsgMail.Body   =   "正文";

  MsgMail.AddAttachment(文件的物理路径,false,文件的类型,例如:text/plain表示txt文档);

  if(MsgMail.Send(Session["SMTPSvr"].ToString(),   false))
  {

  Response.Redirect("./ErrorPage.aspx?error=邮件已经成功发送！");
  }
  else
  {
  Response.Redirect("./ErrorPage.aspx?error=发送失败！");
  } --------------------编程问答-------------------- 其实要看你怎么发了,System.Net.Mail 和System.Web.Mail两个组件都能发邮件
System.Web.Mail发送不需要服务器
System.Net.Mail可以借用别人的服务器比如163,gmail什么的,具体代码网上一搜一大堆 --------------------编程问答--------------------     /// <summary>
    /// 发送邮件，不能发送附件。
    /// </summary>
    /// <param name="send">发件人地址</param>
    /// <param name="recieve">收件人地址</param>
    /// <param name="subject">邮件主题</param>
    /// <param name="mailbody">邮件内容允许是html</param>
    /// <param name="host">发件主机</param>
    /// <param name="pwd">密码</param>
    public void SendMailUseGmail(string send, string recieve, string subject, string mailbody, string host, string pwd,Page page)
    {
        try
        {
            System.Net.Mail.SmtpClient client = new System.Net.Mail.SmtpClient();
            client.Host = host;
            client.UseDefaultCredentials = false;
            client.Credentials = new System.Net.NetworkCredential(send, pwd);

            client.DeliveryMethod = System.Net.Mail.SmtpDeliveryMethod.Network;

            System.Net.Mail.MailMessage message = new System.Net.Mail.MailMessage();
            message.To.Add(recieve); message.From = new System.Net.Mail.MailAddress(send, "派遣168网", System.Text.Encoding.UTF8);
            message.Subject = subject;
            message.Body = mailbody;
            message.BodyEncoding = System.Text.Encoding.UTF8;
            message.IsBodyHtml = true;
            //添加附件
            //System.Net.Mail.Attachment data = new Attachment(@"附件地址如：e:\a.jpg", System.Net.Mime.MediaTypeNames.Application.Octet);
            //message.Attachments.Add(data);

            client.Send(message);
            System.Web.UI.ScriptManager.RegisterStartupScript(page, this.GetType(), "success", "alert('邮件发送成功！');", true);

        }
        catch (Exception ex)
        {

            System.Web.UI.ScriptManager.RegisterStartupScript(page, this.GetType(), "eeror", "alert('邮件发送失败！"+ex.Message+"');", true);
        }

    }

补充：.NET技术 ,  ASP.NET