/**
  * Main WP_Email_Delivery Instance
  *
  * Ensures only one instance of WP_Email_Delivery is loaded or can be loaded.
  *
  * @since 1.0.0
  * @static
  * @see WP_Email_Delivery()
  * @return Main WP_Email_Delivery instance
  */
 public static function instance($file = '', $version = '1.0.0')
 {
     if (is_null(self::$_instance)) {
         self::$_instance = new self($file, $version);
     } else {
         return self::$_instance;
     }
     self::$_instance->setup_constants();
     if (is_null(self::$_instance->settings)) {
         self::$_instance->settings = WP_Email_Delivery_Settings::instance(self::$_instance);
     }
     if (is_null(self::$_instance->connections)) {
         self::$_instance->connections = WP_Email_Delivery_Connections::instance(self::$_instance);
     }
     return self::$_instance;
 }
/**
 * Returns the main instance of WP_Email_Delivery to prevent the need to use globals.
 *
 * @since  1.0.0
 * @return object WP_Email_Delivery
 */
function WPED()
{
    return WP_Email_Delivery::instance(__FILE__, '1.0.8');
}