Snail Mail

Snail Mail adds a fun courier system to Minecraft. As the name suggests, you can send letters and items to your friends using snails, that act as message carriers. You simply need to craft a snailbox using a nautilus shell and iron ingots. This can be used as a mailbox and this is where letters and packages are sent from. You also need a stamp and an envelope to send packages. Stamps can be crafted using paper and ink sacs. And envelopes can be crafted using paper and iron nuggets. These can then be put into a snail box along with items that you would like to send. Type in the name of another player on the server and a snail will appear and slowly move towards the player to deliver the items you have sent. 

This mod offers version for both Forge and Fabric. Take a look at the screenshots to see what you can expect from this mod. Download links are given below.