A delivery point for mail, a box, compartment or slot for this purpose.
A folder or account for the storage of email; an electronic inbox or mailstore.
A collection point for mail intended for onward delivery, a secure box or receptacle for this purpose.
A box or slot into which a courier or postal worker puts letters for a recipient to collect.
A box in which post can be left by a sender to be picked up by a courier or postman (postal worker).