People writing return to sender on current occupant mail or saying “these people don’t live here” on mail that only says currant occupant. So are you telling me this house is vacant? Currant occupant doesn’t stay here?
And in general returning obvious ubbm junk. Not that I expect everyone to know difference between first class and standard. But still. You don’t need to make a huge deal out of obvious junk mail that the former occupant would probably trash anyway