Once you log in, you will land on the dashboard, which provides an overview of your mailbox.
Inbox:
This section shows all new mail items and those that have been viewed but require no further action. The count indicator displays the number of mail items in this folder, including read and unread messages.
Action Required:
This section displays all mail items that require some action to be taken by you, the mailbox renter. You may see warning messages such as "Mail item is about to incur storage fees" five days before the end of the free storage period, or "Mail item is incurring storage fees" if the item exceeds the free storage period. If you've had an Open & Scan completed, a "Follow-up action is required" message will appear to remind you to take further action; otherwise, storage fees will apply.
Recently Completed:
This section displays mail item action requests that have been completed by your mail center in the past seven days.
You can also view your address, which must be used exactly as spelled on this page. For support on your mailbox, you will find the contact details of your mail center.
For more information on the mailbox folders, check out this video, and this article that explains the mailbox folders in detail.