I kinda like the thought but wouldn't a simple action that sends email to the archive list for all senders that aren't on your contact list handle this? That's

I kinda like the thought but wouldn't a simple action that sends email to the archive list for all senders that aren't on your contact list handle this? That's what I do with my phone, actually, and I might consider it for email too. Then you can manually check your archive when you have free time.