MailboxGUI

MailboxGUI adds GUI-based letters, packages, COD packages, XP packages, and money mail for Spigot/Paper servers. Supports physical mailboxes, Post Office boxes, Citizens NPCs, Vault economy, Dynmap markers, languages, and 1.18.2–1.21.11 plus 26.1.x.
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MailboxGUI-4.2.1

ByRismr1
  • R
  • May 18, 2026
  • 1.26 MB
  • 12
  • 26.1.2+26

File Name

MailboxGUI-4.2.1.jar

Supported Versions

  • 26.1.2
  • 26.1.1
  • 26.1
  • 1.21.11
  • 1.21.10
  • 1.21.9
  • 1.21.8
  • 1.21.7
  • 1.21.6
  • 1.21.5
  • 1.21.4
  • 1.21.3
  • 1.21.2
  • 1.21.1
  • 1.20.6
  • 1.20.5
  • 1.20.4
  • 1.20.3
  • 1.20.2
  • 1.20.1
  • 1.20
  • 1.19.4
  • 1.19.3
  • 1.19.2
  • 1.19.1
  • 1.19
  • 1.18.2

MailboxGUI 4.2.1 - Barrel Mailbox Support & Maintenance Polish

MailboxGUI 4.2.1 is a focused maintenance update that adds barrel mailbox support, improves language upgrade handling for older 4.x installs, adds new Notification API helpers, and improves the admin update-check workflow.

Highlights

  • Added barrel support for player mailboxes.
  • Added barrel support for public Post Office boxes.
  • Player mailboxes can now use a single chest or barrel on top of the fence post.
  • Post Office boxes can now use a single chest or barrel as the public access container.
  • Signs must be attached to the front face of the chest or barrel.
  • Existing chest mailbox setups continue working normally.
  • Paper new-mail notifications work with player barrel mailboxes.
  • Added Notification API helpers for future integrations and addon modules.
  • Added /mailbox admin updatecheck and /mba updatecheck.
  • Improved update-check output with clearer current/latest version status and the official MailboxGUI download link.
  • Improved language upgrade handling for older 4.x installs so old default text can update while customized language text stays protected.

Upgrade Notes

  • No mailbox data conversion is required.
  • Existing chest mailboxes and Post Office boxes continue working.
  • Existing language customizations are preserved where possible.
  • Servers upgrading from older 4.x versions receive safer language text updates for command/help wording, typed-recipient wording, and chest/barrel setup wording.