Why is "defer" different from "snooze"? Both indicate picking a time to deal with the email.
verb (used without object), deferred, deferring. 1. to yield respectfully in judgment or opinion (usually followed by to): We all defer to him in these matters.
Or maybe have up to X "snooze slots" so that you cant snooze everything and you snooze things that truly dont deserve to be deleted. And you would have to empty a slot by dealing with a snoozed message to be able to snooze a new one.