If you spend a lot of time working with e-mail on your iOS device, especially across multiple accounts, you may find it handy to know that you can actually now customize your main mailbox listing. With iOS 7, you can change the order of the default smart mailboxes such as the universal inbox, and VIP list, as well as enabling additional types of smart mailboxes. Simply tap the “Edit” button in the top-right corner of the Mailboxes screen…