Mailbox and Pipebombs

This suggestion is the idea of introducing a mail system players can use to give gifts or letters to other players.

While the gift system is great, it relies on the player finding and opening an entity. Cool, but takes up space and is hard if you are untrusted.

Introducing the mailbox. Players can use this block to send items and messages to other mailboxes, and if you send Dynamite to another player, it explodes on contact with them opening their mailbox (fake explosion, no actual damage)