app/code/core/Mage/Adminhtml/Model/System/Config/Source/Email/Identity.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)
 */


class Mage_Adminhtml_Model_System_Config_Source_Email_Identity
{
    protected $_options = null;
    public function toOptionArray()
    {
        if (is_null($this->_options)) {
            $this->_options = array();
            $config = Mage::getSingleton('adminhtml/config')->getSection('trans_email')->groups->children();
            foreach ($config as $node) {
                $nodeName   = $node->getName();
                $label      = (string) $node->label;
                $sortOrder  = (int) $node->sort_order;
                $this->_options[$sortOrder] = array(
                    'value' => preg_replace('#^ident_(.*)$#', '$1', $nodeName),
                    'label' => Mage::helper('adminhtml')->__($label)
                );
            }
            ksort($this->_options);
        }

        return $this->_options;
    }
}

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