In my Gmail app, I want that it notifies me of every new e-mail message as soon as it arrives. I have my Gmail account set to sync in the background and to auto-sync. All the syncing for Gmail is turned on. But if I want Gmail to notify me for every new message as soon as it arrives, how should the settings be set? Should the checkbox for "Notify once - Notify once for new email, not for every new message" be checked or unchecked?