require_once '/var/www/vhosts/mysite.com/httpdocs/config.core.php';
require_once MODX_CORE_PATH.'model/modx/modx.class.php';
$modx = new modX();

$data = filter_input_array(INPUT_GET);

$modx->initialize('web');
$modx->getService('error','error.modError', '', '');
$modx->getService('mail', 'mail.modPHPMailer');
$dataObjs = $modx->getObject('modResource', $data['doc']);`