sleep() и раздляне на порции при пращане на мейл

if ($br>0 && $br%2==0) {sleep(15);}

$br = 100; // праща 100 бройки и спи

$i = 0;

//след което във форийча 

if ($i % $br == 0) {
  sleep(15); // спи по 15 секунди на всеки 100 изпратени имейла
}


$i++;

		$throttle = 100;
		$numSended = 0;
		for($br=0;$br<$NR;$br++){
		  
		  if ($numSended % $throttle == 0) {
        sleep(15); // sleep
      }
      
			if(checkEmail(db_result($RES1, $br, "mailtosend"))){
				$t = new Template("../email_templates", "remove");
				$SQL = "SELECT template_file FROM maillist_template, maillist_email WHERE email_id=".$id." AND email_template=template_id";
				$RS = db_exec(1, $SQL);
				$tf = db_result($RS, 0, "template_file");
				$t->set_file(array("page" => $tf));
				$t->set_var(array(
				"DATE" => date("F d Y", strtotime("now")),
				"NAME" => db_result($RES1, $br, "finalname"),
				"TITLE" => $subject,
				"BODY" => $content,
				"EMAILID"=> $id,
				"HOST" =>"http://".$HTTP_HOST,
				"DEAR" => $translator->translate("DEAR"),
				"Click_here" => $translator->translate("Click_here"),
				"removed_from_maillist" => $translator->translate("removed_from_maillist"),
				"Recomend_to_friend" => $translator->translate("Recomend_to_friend"),
				"EMAIL" => db_result($RES1, $br, "mailtosend")
				));
				$t->parse("OUT", array("page"));
				$maillist_email =  $t->get_var("OUT");
				mail(db_result($RES1, $br, "mailtosend"), $subject, $maillist_email, "From: $email_from\nContent-Type: text/html;\n charset=utf-8;\n");
				//mailque($dbconnmail, db_result($RES1, $br, "mailtosend"), $subject, $maillist_email, "From: (".$email_from.")\nContent-Type: text/html;\n charset=utf-8;\n");
				
				$numSended++;
			}