What do different drop slots do in the USPS office?

We have an old house that has a mail slot on the side of the house That leads straight into a mailbox is that is embedded in the wall We

A: A door mail slot is a small, rectangular opening in the front door through which a mail carrier can deliver mail Its benefits include usability and security

mailbox for door slot The mail courier can slide the tenants' mail into the slot, at drop off the respective unit's mail It's a tedious task that wastes

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