The word "letterboxes" refers to a container or slot for receiving letters or mails. Synonyms for this word include "mailboxes," "postboxes," and "letter slots." A mailbox can be used to send and receive not only letters but packages and parcels as well. Postboxes are often found on street corners or outside of post offices for the public to use. Letter slots are usually found on doors or walls of homes or businesses, allowing for mail to be delivered directly to the recipient without the need for a physical mailbox. Regardless of the synonym used, all function to aid in the delivery and receipt of letters and other mail items.