As long as they leave it in the correct correctly-sized box. I wouldn't see our neighbours in No. 8 half so much if it weren't for exchanging each other's mail.

OTOH in the Good Old Days, we had three Caleb H's in our not-large town--one infant, one teenager (me), one retiree. We kept getting mail for each other because any one post office sorter knew one of us, would see "Caleb H" in the address, and wouldn't bother looking at the rest of the address because, hey, they knew where Caleb H lived (and there couldn't be more than one of them, could there?).