// optional block, defaults are shown
'options' => array(
'url_tracking' => 'yes', // yes | no
'open_tracking' => 'yes', // yes | no
'json_feed' => 'yes', // yes | no
'xml_feed' => 'yes', // yes | no
'plain_text_email' => 'yes',// yes | no
'email_stats' => null, // a valid email address where we should send the stats after campaign done