전체메일을 발송할 때 과부하 방지를 위하여

sleep 을 넣어주기 위해 추가한 소스인데

추가후 발송을 테스트하면 아에 Error 가 떠버립니다.

왜 그런걸까요~?

<?php
    /**
     * @class  mail_m9AdminController
     * @author mmx900 (mmx900@gmail.com)
     * @brief  mail_m9 모듈의 admin controller class
     **/

    class mail_m9AdminController extends mail_m9 {

        /**
         * @brief 초기화
         **/
        function init() {
        }

        /**
         * @brief 설정
         **/
        function procMail_m9AdminSendMail() {
            // 기본 정보를 받음
            $args = Context::gets('sender_name','sender_email','receiptor_name','receiptor_email',
                  'send_to_all', 'title','content','content_type');
           
           
            $oMail = new Mail();
            $oMail->setTitle($args->title);
            $oMail->setContent($args->content);
            $oMail->setSender($args->sender_name, $args->sender_email);
           
            $cnt = 0;
           
            if($args->send_to_all == 'Y'){

            // 모듈 정보를 가져옴
            $oModuleModel = &getModel('module');
            $config = $oModuleModel->getModuleConfig('mail_m9');

           
            // Email List를 가져옴
//            $args->is_mailing = 'Y';
            $output = executeQueryArray('mail_m9.getEmailAddrList');
           
           
            if(!$output->toBool()) {
               return $output;
            }
            
            if($output->data){
              $member_list = $output->data;

    $send_count = 0;
        foreach($member_list as $m){
         if($m->allow_mailing == 'Y'){
                $oMail->setReceiptor($m->user_name, $m->email_address);
                $oMail->send();
                $cnt++;
               }
         if($m->allow_mailing == 'N'){
                $oMail->setReceiptor($m->user_name, $m->email_address);
                $oMail->send();
                $cnt++;
               } // 만약 체크안한사람에게도 메일 보내기를 원할경우

     $send_count++;
if (($send_count % 1000) == 0) {
sleep(5) //메일 1000개 발송때마다 5초씩 쉰다.
} 
        }
             }
            }else{
             $oMail->setReceiptor($args->receiptor_name, $args->receiptor_email);
             $oMail->send();
             $cnt++;
            }
           
            $this->setMessage( sprintf(Context::getLang('msg_send_success'), $cnt) );
        }
       
    }
?>