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++)
            {