app/code/core/Mage/Adminhtml/controllers/Newsletter/ProblemController.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/**
 * Adminhtml newsletter subscribers controller
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Newsletter_ProblemController extends Mage_Adminhtml_Controller_Action
{
    public function indexAction()
    {
        if ($this->getRequest()->getQuery('ajax')) {
            $this->_forward('grid');
            return;
        }

        $this->getLayout()->getMessagesBlock()->setMessages(
            Mage::getSingleton('adminhtml/session')->getMessages(true)
        );
        $this->loadLayout();

        $this->_setActiveMenu('newsletter/problem');

        $this->_addBreadcrumb(Mage::helper('newsletter')->__('Newsletter Problem Reports'), Mage::helper('newsletter')->__('Newsletter Problem Reports'));

        $this->_addContent(
            $this->getLayout()->createBlock('adminhtml/newsletter_problem', 'problem')
        );

        $this->renderLayout();
    }

    public function gridAction()
    {
        if($this->getRequest()->getParam('_unsubscribe')) {
            $problems = (array) $this->getRequest()->getParam('problem', array());
            if (count($problems)>0) {
                $collection = Mage::getResourceModel('newsletter/problem_collection');
                $collection
                    ->addSubscriberInfo()
                    ->addFieldToFilter($collection->getResource()->getIdFieldName(),
                                       array('in'=>$problems))
                    ->load();

                $collection->walk('unsubscribe');
            }

            Mage::getSingleton('adminhtml/session')
                ->addSuccess(Mage::helper('newsletter')->__('Selected problem subscribers successfully unsubscribed'));
        }

        if($this->getRequest()->getParam('_delete')) {
            $problems = (array) $this->getRequest()->getParam('problem', array());
            if (count($problems)>0) {
                $collection = Mage::getResourceModel('newsletter/problem_collection');
                $collection
                    ->addFieldToFilter($collection->getResource()->getIdFieldName(),
                                       array('in'=>$problems))
                    ->load();
                $collection->walk('delete');
            }

            Mage::getSingleton('adminhtml/session')
                ->addSuccess(Mage::helper('newsletter')->__('Selected problems successfully deleted'));
        }
                $this->getLayout()->getMessagesBlock()->setMessages(Mage::getSingleton('adminhtml/session')->getMessages(true));

        $grid = $this->getLayout()->createBlock('adminhtml/newsletter_problem_grid');
        $this->getResponse()->setBody($grid->toHtml());
    }

    protected function _isAllowed()
    {
        return Mage::getSingleton('admin/session')->isAllowed('newsletter/problem');
    }
}

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