You might want to check out our core product, Boomerang. You just choose a date when you want to see an email again. It kicks the message into a label until that time, then brings it back to the top of your inbox, so you can reply when you're ready. We think Inbox Pause goes well with the same core theme.

(I helped write Inbox Pause)

You mean like those Follow Up flags in Outlook that are one right-click away?