Within Teamwork Desk, a Smart Inbox allows you to view a list of tickets based on particular conditions.
The list is updated dynamically, so as soon as a ticket matches the conditions it will show up in the list, even if it isn't a new ticket. For example, you could set up a smart inbox to view all of your high priority tickets with a particular tag, or from a particular email address. You can use a single condition or a combination of them.
You'll see your Smart Inboxes listed in the left pane of your tickets screen, above your original inboxes:
You can create a Smart Inbox that is private to you, or share them so other people can view them too.
For more information see: Creating a Smart Inbox