接上
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//构造函数
public esmtpmail()
{
    attachments = new system.collections.arraylist();
}
//—————–过程
        /// <summary>
        /// 添加邮件附件
        /// </summary>
        /// <param name="path">附件绝对路径</param>
        public void addattachment(string path)
        {
            attachments.add(path);
        }

        /// <summary>
        /// 添加一个收件人
        /// </summary>    
        /// <param name="str">收件人地址</param>
        public bool addrecipient(string str)
        {
            str=str.trim();
            if(str==null||str==""||str.indexof("@")==-1)
                return true;
            if(recipientnum<recipientmaxnum)
            {
                recipient.add(recipientnum,str);
                recipientnum++;             
                return true;
            }
            else
            {
                errmsg+="收件人过多";
                return false;
            }
        }

        /// <summary>
        /// 添加一组收件人（不超过recipientmaxnum个），参数为字符串数组
        /// </summary>
        /// <param name="str">保存有收件人地址的字符串数组（不超过recipientmaxnum个）</param>    
        public bool addrecipient(string[] str)
        {
            for(int i=0;i<str.length;i++)
            {
                if(!addrecipient(str[i]))
                {
                    return false;
                }
            }
            return true;
        }

        /// <summary>
        /// 发送邮件方法，所有参数均通过属性设置。
        /// </summary>
        public bool send()
        {
            if(recipient.count==0)
            {
                errmsg="收件人列表不能为空";
                return false;
            }

            if(mailserver.trim()=="")
            {
                errmsg="必须指定smtp服务器";
                return false;
            }

            return sendemail();
          
        }

        /// <summary>
        /// 发送邮件方法
        /// </summary>
        /// <param name="smtpserver">smtp服务器信息，如"username:password@www.smtpserver.com:25"，也可去掉部分次要信息，如"www.smtpserver.com"</param>
        public bool send(string smtpserver)
        {
          
            maildomain=smtpserver;
            return send();
        }

        /// <summary>
        /// 发送邮件方法
        /// </summary>
        /// <param name="smtpserver">smtp服务器信息，如"username:password@www.smtpserver.com:25"，也可去掉部分次要信息，如"www.smtpserver.com"</param>
        /// <param name="from">发件人mail地址</param>
        /// <param name="fromname">发件人姓名</param>
        /// <param name="to">收件人地址</param>
        /// <param name="toname">收件人姓名</param>
        /// <param name="html">是否html邮件</param>
        /// <param name="subject">邮件主题</param>
        /// <param name="body">邮件正文</param>
        public bool send(string smtpserver,string from,string fromname,string to,string toname,bool html,string subject,string body)
        {
            maildomain=smtpserver;
            from=from;
            fromname=fromname;
            addrecipient(to);
            recipientname=toname;
            html=html;
            subject=subject;
            body=body;
            return send();
        }