ItemMailBox

A lightweight Paper 1.21.x plugin that lets players share items through an intuitive mailbox GUI - no chests, no clutter.

Features:

• /itembox — Open your personal inbox. Items sent by others appear here. Click to claim.
• /itembox send — Open a send GUI. Drop in items and hit send — they arrive in the recipient's mailbox, even if they're offline.
• Favorites - Add friends to your favorites list: /itembox fav add . Open the favorites GUI (/itembox fav) and click a head to send items instantly — no more typing names.
• Public mailboxes — Toggle your mailbox to public with a button in the GUI. Others can view it with /itembox view .
• Key requirement (optional) — Require a key item (configurable material) to send items. Great for server economies or gated features.
• Cooldown (optional) — Set a send cooldown in seconds to prevent spam.
• Fully configurable — All messages, titles, colors, and behavior are customizable in config.yml.
• Permissions — Granular permission nodes for every feature (itembox.use, itembox.send, itembox.reload, etc.).
  Offline support — Send items and add favorites even when the target player is offline (uses the server's usercache).
• GUI pagination — Browse mailboxes and favorites with next/previous page buttons.
• YAML storage — Lightweight per-player data files in the mailboxes/ folder.

Commands

Configuration

config.yml is generated on first run. Key options:

require-key: false
key-item: TRIPWIRE_HOOK
allow-public: true
send-cooldown: 0

All GUI titles and messages support & color codes.

Requirements

• Paper 1.21.x (or compatible fork)
• Java 21+

Installation

1. Drop the JAR into your plugins/ folder.
2. Restart the server.
3. Configure config.yml to your liking.
4. Done. No dependencies.