Identity.php

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<?php
namespace Magento\Config\Model\Config\Source\Email;

class Identity implements \Magento\Framework\Option\ArrayInterface
{
    protected $_options = null;

    protected $_configStructure;

    public function __construct(\Magento\Config\Model\Config\Structure $configStructure)
    {
        $this->_configStructure = $configStructure;
    }

    public function toOptionArray()
    {
        if ($this->_options === null) {
            $this->_options = [];
            $section = $this->_configStructure->getElement('trans_email');

            foreach ($section->getChildren() as $group) {
                $this->_options[] = [
                    'value' => preg_replace('#^ident_(.*)$#', '$1', $group->getId()),
                    'label' => $group->getLabel(),
                ];
            }
            ksort($this->_options);
        }
        return $this->_options;
    }
}