This mod is still in alpha phase. There is much more to come... If you have any feedback or ideas please submit it on Github
Items
- Letter
- Is produced when closing an envelope
- Can be designated to a specific player
- Has encrypted content
- Has a title and an author (which can be removed to make the letter anonymous)
- Letter Paper
- Is used for writing letters
- Is equivalent to book and quill, but with a maximum of 10 pages
- Envelope
- Contains a maximum of 3 letter papers
- Can be closed to create a letter
- Key
- Is used to open a locked mailbox
- Unused Key
- Is used for locking a mailbox and duplicating existing keys
Blocks
- Mailbox
- Works like a container
- Has 15 slots
- Can only hold letters, letter papers and envelopes
- Emits a comparator signal according to how many slots are filled
- Drops itself including the contents when dropped
- Can be locked when crafted together with an Unused Key
Quick facts
- Edition: Minecraft Java
- File type: .jar
- Minecraft version listed: 1.21.4
- How to install: Install the matching mod loader (Forge, Fabric or NeoForge) for your Minecraft version. → Download the .jar. → Put it in the .minecraft/mods folder and launch that loader profile.
- Where to get it: Opens on Modrinth — not every file is mirrored on our own servers.
Install steps are the general flow for this file type — How to install Minecraft Java mods & modpacks walks through it step by step.
Verified by MCModsHub
- Ships as communicated-1.0.0-alpha.4.jar — drop this file into the mods folder
- Download size: 228 KB
- Download link checked 7 Sept 2026 — working
These come from our own check of the pack file, not from the source page.