Google is now making some updates to their popular email system. Gmail now offers increased spam blocking protection. Historically Gmail has had a reasonable amount of spam protection and only allowed in items that the user normally signed up for. Gmails new Spam system is going to deliver emails marked as spam (that fail their new standards, old email spam protection still will block the true spam emails) and allow the user to see why they marked it as spam. It will then allow you to unmark the item as spam or keep it as such.
This new feature is going to allow Gmails users more flexibility and greater usability of their popular service.
If interested in reading more click here.