reviewing "read" emails
I get a lot of emails that I want to keep for a week or so then delete (weekly specials/limited time offers/what's on this week etc).
Instead of keeping them, then manually trawling through my emails deleting outdated offers, could you put in another tab "review/delete in x days"? We choose the number of days and they either pop up as unread again (to review) or automatically deletes after that number of days.
It would make housekeeping my emails so much easier!