MailBox

A mod that allows admins or the server to easily send mail containing messages and items to players.

84 Downloads

fabricutility

Rent Server with this Mod

Screenshots

About this Mod

It is easy for administrators to send messages and items to mail with players or servers. UI was created with Jetpack Compose and Material 3 through Composite mode.

Dependencies

https://modrinth.com/mod/composite
https://modrinth.com/mod/pyke-lib

Commands and KeyBinding

/우편 보내기 - Open Send Mail Screen

Default Key (P) - Open MailBox

How to use

MailBoxData newMail = MailBoxData.create(String title, String senderName, String content, List<ItemStack> items);
ModComponents.MAIL_BOX.get(receiver).addMail(newMail);

Available Versions

MailBox 1.0.0release

MC 1.21.1fabric

February 1, 2026

How to Install MailBox on Your Server

Order Server

Order a Minecraft Java server with at least 3 GB RAM (4 GB recommended).

Set fabric Loader

In the panel under "Egg", select the fabric loader and matching Minecraft version (1.21.1).

Install Mod

Open the mod browser in the dashboard and search for "MailBox". Click "Install" – done! Alternatively, upload the .jar via SFTP to the /mods folder.

Compatibility

Mod Loaders

fabric

Minecraft Versions

1.21.1

Server-side

✓ Required

Recommended RAM

4 GB(min. 3 GB)

Frequently Asked Questions

MailBox server crashes on startup – what to do?

Most common cause: wrong fabric version or insufficient RAM. Check the server log (latest.log) for "OutOfMemoryError" or "Mixin" errors. With Mado Hosting: ensure at least 3 GB RAM is allocated and the loader matches the mod version (1.21.1). You can switch loaders with one click in the panel.

Is MailBox compatible with fabric?

MailBox officially supports fabric for Minecraft 1.21.1. The Mado dashboard automatically detects incompatible loader combinations.

Server lagging with MailBox – how to optimize performance?

Recommended RAM: 4 GB (per 8 players). Use /spark profiler to check if MailBox consumes the most tick time. Common fixes: reduce server view-distance to 8-10, install "performant" or "starlight" as supplementary mods on Forge. With Mado Hosting, your server runs on NVMe SSDs with dedicated CPU cores for minimal latency.