You want your app to have its own copy of a user's email: to search it fast, run analytics over it, or feed it to a model without hitting the provider on every query. The naive version is a one-time pull that's stale the moment it finishes, because new mail keeps arriving and old mail gets read, moved, and deleted. A real sync is two jobs working together: backfill the history once, then track changes forever after. This post builds that out with the Email API and shows the CLI shortcuts for tes...