protected function _initEmail()
    {
        $token = $this->getRequest()->getParam('token');
        $index = $this->getRequest()->getParam('index');

        if ($token === null || $index === null) {
            $this->getResponse()->setHttpResponseCode(400)->setBody('Invalid parameters');
            return null;
        }

        /** @var Sheep_Debug_Model_RequestInfo $requestProfile */
        $requestProfile = Mage::getModel('sheep_debug/requestInfo')->load($token, 'token');
        if (!$requestProfile->getId()) {
            $this->getResponse()->setHttpResponseCode(404)->setBody('Request profile not found');
            return null;
        }

        $emails = $requestProfile->getEmails();
        if (!$emails || !($index < count($emails))) {
            $this->getResponse()->setHttpResponseCode(404)->setBody('E-mail not found');
            return null;
        }

        return $emails[(int)$index];
    }