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<? 
AddEventHandler('main', 'OnBeforeEventSend', "OnBeforeEventSendHandle");

function OnBeforeEventSendHandle($arFields)
{

   $ListGroupsID = Array();
   $GetListGroups = CGroup::GetList($by = 'c_sort', $order = 'asc');
   while($UGroup = $GetListGroups->Fetch())
   {
      $ListGroupsID[] = $UGroup['ID'];
      $ListUserID = array();
      $ListUserID = CGroup::GetGroupUser($UGroup['ID']);
      foreach($ListUserID as $UserID)
      {
         $rsUser = CUser::GetByID($UserID);
         $arUser = $rsUser->Fetch();
         $arFields[$UGroup['ID']] .= $arUser['EMAIL'] . ';';
      }
   }
   foreach($arFields as $key=>$string)
   {
      $arFields[$key] = rtrim($string, ';');
   }
}
?>