$params['unsubscribe_id']['api.default'] = CRM_Mailing_PseudoConstant::defaultComponent('Unsubscribe', '');
$params['mailing_type']['api.default'] = 'standalone';
$defaultAddress = CRM_Core_OptionGroup::values('from_email_address', NULL, NULL, NULL, ' AND is_default = 1');
$params['unsubscribe_id']['api.default'] = CRM_Mailing_PseudoConstant::defaultComponent('Unsubscribe', '');
$params['mailing_type']['api.default'] = 'standalone';
$defaultAddress = CRM_Core_OptionGroup::values('from_email_address', NULL, NULL, NULL, ' AND is_default = 1');