Where mailboxes come to die.
The Mailbox (ポスト, Posuto) is an area accessible from the red mailbox in the Underground TV Complex.
The mailbox is a large cloudy area featuring slot and flag mailboxes of various shapes, sizes and colours. Letters of various sizes are also scattered throughout the area.
Many of the smaller rectangular boxes have face-like designs on them, with the occasional letter on the ground nearby.
Some of the mailboxes feature designs that only appear under certain circumstances. Equipping the Glasses effect near the black slot mailboxes will reveal an eye, and equipping it near the tall red flag mailboxes will reveal a long white hand hanging down from inside.
Also within the area are two mailboxes engraved with kanji.
One is a black box engraved with the kanji 迷 (Mei, Astray) and the other is a red & gold box engraved with the kanji 夢 (Yume, Dream).
If text options are turned off at the Computer, both boxes will display their kanji inverted and unreadable.