利用System.Net.Mail 的SmtpClient发送邮件

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/// <param name="toAddr">接受人地址</param>
        /// <param name="Cc">抄送</param>
        /// <param name="Mcc">密送</param>
        /// <param name="from">发送人地址</param>
        /// <param name="content">邮件内容</param>
        /// <param name="subject">邮件标题</param>
        /// <param name="attach">附件</param>
        /// <param name="Pwd">密码</param>
        public void SendMailByPlainFormat(string toAddr, string Cc, string Mcc, string from, string content, string subject, string attach,string Pwd)
        {
            MailMessage mailobj = new MailMessage();
            mailobj.From = new MailAddress(from);//发件人
            //mailobj.To.Add(toAddr); //收件人或下面的收件人组

               #region 收件人组
                ArrayList list = new ArrayList();
                list.Add("**@163.com");
                list.Add("**@qq.com");
                for (int i = 0; i < list.Count; i++)
                {
                    MailAddress toAddress = new MailAddress(list[i].ToString());
                    mailobj.To.Add(toAddress);//收件人
                }
                #endregion

            if (Cc != "")
                mailobj.CC.Add(Cc); //抄送
            if (Mcc != "")
                mailobj.Bcc.Add(Mcc); //密送
            mailobj.Priority = MailPriority.High; //发送优先级
            mailobj.Subject = subject; //主题
            mailobj.Body = content;   //内容
            mailobj.IsBodyHtml = true; //内容是否可以为html形式
            mailobj.BodyEncoding = Encoding.Default;
            if (attach != "")
            {
                char[] delim = new char[] { ';' };
                foreach (string substr in attach.Split(delim))
                {
                    Attachment MyAttach = new Attachment(substr);
                    //MailAttachment MyAttach = new MailAttachment(substr);
                    mailobj.Attachments.Add(MyAttach);

}
}

            SmtpClient smtp = new SmtpClient();
            //smtp.Host = this.server; //服务器
            //smtp.Port = this.port;    //端口
            //smtp.Credentials = new System.Net.NetworkCredential(this.user, this.password); //用户名和密码
            smtp.Host = "smtp."+from.Substring(from.IndexOf("@")+1); //服务器
            smtp.Port = 25;    //端口
            smtp.Credentials = new System.Net.NetworkCredential(from, Pwd); //用户名和密码
            smtp.Send(mailobj);
        }

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