Postbox

Postboxes, sometimes called Mailboxes, are recurring items in the Legend of Zelda series. As in the real world, they are used as mediums for sending and receiving mail.

The Legend of Zelda: Majora's Mask
Postboxes are scattered throughout Clock Town. They serve as a means of sending letters, as the Postman checks them every day and delivers the mail personally.

If on the Final Day before the Carnival of Time, Link gives the Postman the Priority Mail from Kafei, the Postman will deliver it to Madame Aroma in the Milk Bar. When this happens, Madame Aroma will grant the Postman permission to evacuate Clock Town due to the Moon's impending fall, and in his bliss, the Postman gives Link his hat. When Link wears the Postman's Hat, he can check inside the Postboxes; the first time he does this he receives a Piece of Heart, while every proceeding time, earns him a Green Rupee.

The Legend of Zelda: The Wind Waker
Postboxes are scatterered throughout the Great Sea. Similar to their Majora's Mask counterparts, they are used to send letters. This time, however, there are several differences; Link must pay to send letters, Postboxes are used to receive mail as well, and they are operated by the Rito postmen.

Interestingly, Postboxes dance when there is mail inside for Link.

''The Legend of Zelda: Phantom Hourglass
Postboxes are found throughout the World of the Ocean King. Link only has to send a letter once: the postcard he receives from the Man of Smiles.

Interestingly, receiving mail in Phantom Hourglass is a mix of sorts between Majora's Mask and The Wind Waker; when Link approaches a Postbox it will begin to dance, but instead of going inside it to retrieve the mail, the winged Posman will approach and read out his letter personally.