ModsFinder

Inbox

by small_jiu

Inbox adds a cross-dimensional mailbox system to Forge, letting players send mail and attachments to one another even when the recipient is offline.

ForgeClient and serverGNU Affero General Public License v3.0 or laterOpen source1.20.1 – 1.20.6

What it does

Mail is delivered to the recipient's inbox and stays there until it is collected, so an offline player receives items and messages on their next login. Senders can attach items to a letter, and the recipient collects them from the interface. The mailbox works across dimensions, so a player in the Nether or the End can receive mail sent from the overworld.

Server owners can schedule automated mails that go to online players, known players, specific groups or everyone at set times, which suits announcements and timed rewards. Permissions can be controlled with a whitelist or blacklist, and storage limits can be adjusted through the config files. The mod is open source under the GNU Affero General Public License v3.0 or later.

Inbox is installed on both the server and the client, and it is published for Forge across six release versions, 1.20.1 – 1.20.6. The latest file, 1.20.1-1.2.1 for 1.20.6, was released on 2025-12-31, the same day the mod was first published.

Key features

  1. Offline mail delivery

    Letters and attached items wait in the recipient's inbox until they log in and collect them.

  2. Rich attachments

    Senders can attach items to a message, so the mailbox doubles as a way to exchange goods between players.

  3. Send history

    A record of sent mail is kept, so a sender can check what was delivered and when.

  4. Saved recipients

    Frequently used recipients are stored for quick resending, without retyping their names.

  5. Scheduled mails

    Mails can be queued to send automatically at set times to online players, known players or chosen groups.

  6. Sending controls

    An administrator can block a player from sending mail, and storage limits are set in the config files.

Compatibility

Latest build for each game version and loader.

1.20.61.20.1-1.2.1
1.20.51.20.1-1.2.1
1.20.41.20.1-1.2.1
1.20.31.20.1-1.2.1
1.20.21.20.1-1.2.1
1.20.11.20.1-1.2.1
ReleaseBetaAlphaNot available

Only full game releases are shown. This mod publishes no snapshot builds.

Use cases

Server economies

Server owners can route item payments and trades through the mailbox, so a sale can be settled while the buyer is away.

Timed rewards and announcements

Scheduled mails deliver rewards or news to groups of players at a chosen time, without an operator online to send them.

Who it’s for: Server owners running economies, adventure maps or community events, and players on multiplayer servers who need to send items or messages to people who are not online.

Questions

Does Inbox need to be installed on both sides?

Yes. Installation covers the server and each player's game.

Which Forge versions does Inbox support?

Forge builds exist for 1.20.1, 1.20.2, 1.20.3, 1.20.4, 1.20.5 and 1.20.6, and the latest file is 1.20.1-1.2.1 for 1.20.6.

Can a player receive mail while offline?

Yes. Delivered mail and attachments stay in the inbox until the recipient logs in and collects them.

What the author says

Inbox adds a fully-featured, customizable, and cross-dimensional mailbox system to Minecraft. Perfect for multiplayer servers, adventure maps, or solo worlds, it allows players to send and receive mail with rich attachments—even when offline—bridging communication and item exchange like never before. If you need a…
small_jiu, on the Modrinth page

Official listing

Owner
small_jiu
Published
2025-12-31
Updated on Modrinth
2025-12-31
Facts verified
2026-10-15
Open on ModrinthCompare