C#简单邮件群发通用类

public static class email
  {
    /// <summary>
    /// 发件人
    /// </summary>
    public static string mailfrom { get; set; }

    /// <summary>
    /// 收件人
    /// </summary>
    public static string[] mailtoarray { get; set; }

    /// <summary>
    /// 抄送
    /// </summary>
    public static string[] mailccarray { get; set; }

    /// <summary>
    /// 标题
    /// </summary>
    public static string mailsubject { get; set; }

    /// <summary>
    /// 正文
    /// </summary>
    public static string mailbody { get; set; }

    /// <summary>
    /// 发件人密码
    /// </summary>
    public static string mailpwd { get; set; }

    /// <summary>
    /// smtp邮件服务器
    /// </summary>
    public static string host { get; set; }  

    /// <summary>
    /// 邮件服务器端口
    /// </summary>
    public static int port { get; set; }

    /// <summary>
    /// 正文是否是html格式
    /// </summary>
    public static bool isbodyhtml { get; set; }

    /// <summary>
    /// 附件
    /// </summary>
    public static string[] attachmentspath { get; set; }

    public static bool send()
    {
      //使用指定的邮件地址初始化mailaddress实例
      mailaddress maddr = new mailaddress(mailfrom);

      //初始化mailmessage实例
      mailmessage mymail = new mailmessage();

      //向收件人地址集合添加邮件地址
      if (mailtoarray != null)
      {
        for (int i = 0; i < mailtoarray.length; i++)
        {
          mymail.to.add(mailtoarray[i].tostring());
        }
      }

      //向抄送收件人地址集合添加邮件地址
      if (mailccarray != null)
      {
        for (int i = 0; i < mailccarray.length; i++)
        {
          mymail.cc.add(mailccarray[i].tostring());
        }
      }
      //发件人地址
      mymail.from = maddr;

      //电子邮件的标题
      mymail.subject = mailsubject;

      //电子邮件的主题内容使用的编码
      mymail.subjectencoding = encoding.utf8;

      //电子邮件正文
      mymail.body = mailbody;

      //电子邮件正文的编码
      mymail.bodyencoding = encoding.default;

      //电子邮件优先级
      mymail.priority = mailpriority.high;

      //电子邮件不是html格式
      mymail.isbodyhtml = isbodyhtml;

      //在有附件的情况下添加附件
      try
      {
        if (attachmentspath != null && attachmentspath.length > 0)
        {
          attachment attachfile = null;
          foreach (string path in attachmentspath)
          {
            attachfile = new attachment(path);
            mymail.attachments.add(attachfile);
          }
        }
      }
      catch (exception err)
      {
        throw new exception("在添加附件时有错误:" + err.message);
      }

      smtpclient client = new smtpclient();

      //指定发件人的邮件地址和密码以验证发件人身份
      client.credentials = new networkcredential(mailfrom, mailpwd);

      //设置smtp邮件服务器
      //client.host = "smtp." + mymail.from.host;
      client.host = host;

      //smtp邮件服务器端口
      client.port = port;

      //是否使用安全连接
      //client.enablessl = true;

      try
      {
        //将邮件发送到smtp邮件服务器
        client.send(mymail);
        return true;
      }
      catch (smtpexception ex)
      {
        string msg = ex.message;
        return false;
      }

    }