Sure you can. But in most cases, you don’t need to, or at least not nearly as many. In most email clients, folders are just about the only way to get organized. Relenta, on the other hand, offers your entire team a nice array of innovative email management features to get organized and share workload.
That said, you can create your own in Settings > Email Folders. You can also drag-and-drop folders in the left column to change display sequence.