“This release also includes another new Item to be placed in your Beacon, the Letter Box. This handy device allows Citizens to leave each other Private Messages, much as you would your Friends or Guild Team in Boundless. Say you’re exploring a World, come across an amazing Build and just have to congratulate the architect – just drop a Message into their Letter Box and they’ll get it next time they’re online. This should have some useful implications for Traders too, allowing more nuanced negotiation and sales to be conducted within the Messaging System, making the most of its asynchronous capabilities.”
Content retrieved from: https://massivelyop.com/2019/02/03/sandbox-mmo-boundless-latest-update-adds-new-building-mats-and-mailboxes-ahead-of-lovestruck-event/.