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    2,046,932 files checkedFiles from Modrinth and CurseForge we downloaded and checked. Counted on 24 Oct 2026.636,163 files with their code readFiles whose code we turned back into readable code and read, in an isolated environment. Counted on 24 Oct 2026.269,480 projects gradedProjects with a letter from A to F. Counted on 24 Oct 2026.
    How it worksMalware we foundAPIAboutPrivacyTermsContact

    © 2026 ModgradeNot an official Minecraft product. Not approved by or associated with Mojang or Microsoft.

    Envelope

    Mod

    Letters. Packages. And pigeons to deliver them across the world.

    A93/ 100
    • OverviewA
    • SecurityPassed
    • PrivacyGoes online
    • AINone found
    • CompatibilityMinecraft 1.21.1
    • ModpacksIn 296
    • ReleasesLatest 20 Oct

    Download

    envelope-fabric-1.21.1-0.8.0.jar

    Released 20 Oct 2026 · 2.2 MB

    Passed: our checks found nothing harmful in this file.

    Download

    Required to run

    • Fabric APIAMinecraft 1.21.1 · Fabric (release 0.116.17)
    • Forge Config API PortAMinecraft 1.21.1 · Fabric (release 21.1.6)
    OverviewSecurityPrivacyAICompatibilityModpacksReleases

    Why grade A

    How grades work

    Strengths

    • Security checks passed
    • Public source code and issue tracker

    Points lost

    • First release only 9 months ago−2 points
    • Releases in only 7 of the last 24 months−1 point
    • Releases replaced within 3 days to fix a problem−1 point
    • Under 5 million downloads−1 point
    All 11 criteria

    • Maintenance

      1 point lost26 / 27
      Last releaseHow long ago the newest file came out, or an existing file was marked as working on a new Minecraft version.4 days ago (20 Oct 2026) 12 / 12
      Supports popular versionsWhether the project has a file for a Minecraft version that 15% or more of the popular mods updated in the last 6 months also support. A version many modpacks use, like 1.20.1 or 1.21.1, also counts after a release in the last 12 months.1.21.1 on NeoForge and Fabric. 15% or more of the popular mods updated in the last 6 months also have files for 1.21.1. Latest Minecraft: 26.3. 9 / 9
      Regular releasesIn how many of the last 24 months a new file came out. Full points at 8 months.Releases in 7 of the last 24 months 5 / 6

    • Stability

      1 point lost21 / 22
      Removed from modpacksHow many modpacks removed it in a later version of the pack. We can only see this in modpacks with two or more versions. A pack that swaps it for another edition of the same project, or that is rebuilt from scratch, does not count.25 of the 245 modpacks with two or more versions removed it in a later one (10%) 10 / 10
      Quick fixesHow often a release needed a quick fix: a new release within 3 days to fix a problem in it.2 of its 13 releases in 2 years needed a quick fix (15%) See the 2 releases6 / 7
      Known conflictsHow many projects say they do not work with it, compared with how widely it is used. Packs, small projects, forks, ports, add-ons, alternatives and old versions do not count.None 5 / 5

    • Transparency

      Full points10 / 10
      Source codeWhether the project page links to its source code, so anyone can read what it does.GitHub · mortuusars/Envelope 7 / 7
      Place to report problemsWhether the project page links to a place where players can report problems: an issue tracker.GitHub issues · mortuusars/Envelope 3 / 3

    • Popularity

      1 point lost3 / 4
      DownloadsDownloads on Modrinth and CurseForge. Full points from 5 million.316,646 3 / 4

    • Track record

      2 points lost6 / 8
      AgeHow long the project has existed. It counts less when no new file came out recently.9 months, 26 releases 6 / 8

    • Security

      Passed
      File checksThis check adds no points. It can only take points away.Our checks found nothing harmful in both latest files for recent Minecraft versions. See Security
    Total93 / 100

    65.9 of the 71 points that apply = 93 out of 100. The points above are rounded to whole numbers.

    Images

    • Mailbox
    • Letter
    • Packing
    • JEI Mailing Recipes
    • Collapsed Mail Hub
    • Collapsed Mail Hub
    • Collapsed Mail Hub
    • Plains Dovecote
    • Desert Dovecote
    • Savanna Dovecote
    • Savanna Dovecote
    • Taiga Dovecote
    • Taiga Dovecote

    About

    Envelope adds a pigeon-powered postal system for sending letters, item packages, and deliveries between addressed mailboxes. Players can find and tame the routine of caring for pigeons with seeds: the passive birds follow seed-holding players, live in pigeonholes, and fly mail to its destination before returning home. To send mail, assign a recipient with an address tag, place the item and seeds in a mailbox, and nearby rested pigeons will carry the delivery; mail is stored in the recipient mailbox’s inbox, which can hold up to 512 stacks. Pigeons can travel to and return from unloaded chunks, and fly high above the clouds on long routes, so they are only visible near a mailbox while delivering. Letters provide a short note, while packages hold up to six stacks of items in one slot and can be mailed as a compact way to carry goods. Seal stamps mark letters or packages with the sealer’s name and evidence of authorship and integrity. Payback requests support item-for-item trades through the mail service: the buyer receives a payment box, the requested mail remains stored until payment arrives, and unpaid mail returns to its sender after the deadline. Pigeonholes house up to three pigeons and produce bone meal when their accumulated waste is cleaned; dovecotes and a cloud-top Collapsed Mail Hub add structures to discover, while the latter and Nether Charred Pigeons can yield lost packages. Charred Pigeons are hostile Nether creatures that can carry packages and revert to ordinary pigeons after returning to the Overworld. The mail crafting system can be extended with datapacks, addons, or KubeJS scripts.

    Written from Modrinth . How we write it

    In-game changes

    Changes the game's code in 7 areas: Mobs and their behaviorChanges 7 game code files in this area: mobs, animals, villagers, projectiles and how they move and act., PlayerChanges 2 game code files in this area: your character: movement, abilities, hunger and controls., Inventory and itemsChanges 2 game code files in this area: items, chests and other containers, crafting and enchanting., Server and world logicChanges 2 game code files in this area: the world, commands, scoreboards, saved data and game rules., User interfaceChanges 1 game code file in this area: menus, screens, tooltips, the chat window and the in-game overlay., Blocks and fluidsChanges 1 game code file in this area: how blocks, fluids and redstone work. and Game data and resourcesChanges 1 game code file in this area: recipes, tags, advancements, language files and other game data..

    A library packed inside it changes 6 more game code files: Mortaar.

    Adds 18 blocks, 29 items, 3 mobs, 5 structures, 52 recipes, 10 advancements, 23 loot tables and 43 sounds.

    Counted from the names and data files in the mod, so the list may not be complete.

    Replaces 1 of vanilla Minecraft's fonts.

    Often used with it

    See all 30
    Create AeronauticsBCreate: Copycats+ALithiumAAmendmentsAChippedC

    Details

    Creator
    mortuusars
    License
    GNU General Public License v3.0 only
    Downloads
    317K
    Created
    30 Jan 2026
    Official pages
    Modrinth , CurseForge
    Links
    Source code , Issues , Wiki , Discord

    Security

    No harmful code found

    We checked its files and read their code, without running it.

    What it can do on your computer

    Connects to the internet
    It has code that can go online, for example to check for updates, load skins or send crash reports. Found in Mortaar, a library it includes. See Privacy
    Creates settings files
    The mod keeps its settings in the config folder of your game, where you can change or delete them.

    Why we show this: a mod runs on your computer like any program, so harmful code in it can take your accounts or files. Our checks look for known signs of harm. They cannot prove that a file is harmless. In the grade: malware means no grade, and a Warning in a latest file for a recent Minecraft version lowers it.

    How we checked · Both latest files checked, last on 20 Oct 2026
    • FilesWe download the files from Modrinth or CurseForge and look at what is inside them and what their code can do, without running them. Fixed rules tell what is harmful.
      2 latest files: the newest file for each Minecraft version and loader. Both are for recent versions. Recent versions: those released in the last 2 years, plus 1.20.1 and 1.21.1, among the most played in modpacks. See each file in Releases
    • Their codeWe turn the code of the files back into readable code and follow what it does, without running it. This shows what it downloads, what it sends and where your login goes.
      Read without running it
    • Author on ModrinthThe disclosure form on Modrinth, where the author declares that the project reads or edits things on your system outside the game. Since 13 Aug 2026, Modrinth's rules require it when this applies.
      Nothing declared about your system outside the game.
    • Looked for, not foundWe looked for these in the file and did not find them.
      Folders outside the game, other programs, updating itself, the webcam or microphone, an AI service.

    Privacy

    We found nothing it sends about you

    We read its code without running it: it contacts 1 web address while you play.

    Like any connection, each address it contacts sees your IP address.

    Why we show this: a mod can send things about you over the internet, like your player name or your login. Contacting an address to check for updates or download files sends nothing about you. Not in the grade: sending data can be normal for what a mod does.

    How we checked · Both files read
    • Files readWe read the code without running it. We list each web address the code contacts while you play, and what it sends. Code that is never used is left out.
      The code of both files, for recent Minecraft versions. See each file in Releases
    • raw.githubusercontent.com
      Downloads the list of supporters to unlock their rewards.
    • Author on ModrinthThe disclosure form on Modrinth, where the author declares crash reports, usage data and advertisements. Since 13 Aug 2026, Modrinth's rules require it when a project collects data on its users or shows advertisements.
      Nothing declared about crash reports, usage data or advertisements.

    AI

    No sign so far that AI was used to make it

    We looked for AI tools in its texts, files, images and sounds and found none.

    We have not read its code history yet.

    No sign of AI in the game

    We found no AI service, AI library or AI model file in its code.

    Why we show this: some players and servers avoid projects made with AI, and AI in the game can send what you write to an online service. Not in the grade: using AI does not tell whether a project works well or is kept up to date.

    How we checked · 6 places read
    • Author on ModrinthThe disclosure form on Modrinth. Since 13 Aug 2026, Modrinth's rules require it when a substantial part of the code is AI output, when an asset is mainly AI output, or when the project or its page relies on generative AI.
      No AI content or AI features declared.
    • Code historyThe public code on GitHub: who made each change, credit lines such as "Co-authored-by", and its files.
      Not read yet
    • Description and changelogsThe description, project page and newest changelogs: sentences saying an AI tool was used, and text pasted from an AI chat.
      Nothing found
      38 of 40 changelogs read
    • Its filesFiles that AI coding tools leave behind (like AGENTS.md), and the texts inside the files you download.
      Nothing found
    • Images in its filesHidden data in the images of the files you download, where AI image tools write their name and settings.
      Nothing found
      276 images read
    • Sounds in its filesThe tags of the sound files in the files you download, where some AI music tools write their name.
      Nothing found
      40 of 41 sounds read
    • Code of the modThe code and files of the mod, read without running it: addresses of AI services, AI libraries, AI model files and a place for your own AI key.
      No AI service, AI library or AI model file
      534 code files read

    Compatibility

    See all 26 files
    Fabric
    NeoForge
    1.2126.126.2

    Point at or tap a version to see its loaders.

    Runs onWhere to install it: in your game, on the server, or both. As the author says on Modrinth.Needed in your game and on the server, or you cannot join.
    RequiresProjects you must also install for it to work. From the author's lists for its files for recent Minecraft versions, or from its project page.
    Fabric APIon FabricAForge Config API Porton FabricA
    OptionalProjects it can work with but does not need. The author lists them.Nothing
    IncludesProjects packed inside its files.Nothing
    Speed of updatesHow fast it gets a file for new Minecraft versions, on average, compared with similar projects. Not part of the grade.It has no file for Minecraft versions newer than 1.21.1. Many recently updated mods still support 1.21.1.

    Related projects

    Projects that need Envelope to work.

    ProjectTypeDownloadsGrade
    Create: Envelope compatBMod4.9K downloadsCreate: EnvelopeBMod513 downloadsStrajaDMod85 downloadsQuestLog Envelope Addon [QLXE]DMod49 downloads

    Modpacks using this project

    Find modpacks with it
    Modpacks that released a new version with this project, each month
    2001000
    Oct 2024: 0 modpacksNov 2024: 0 modpacksDec 2024: 0 modpacksJan 2025: 0 modpacksFeb 2025: 0 modpacksMar 2025: 0 modpacksApr 2025: 0 modpacksMay 2025: 0 modpacksJun 2025: 0 modpacksJul 2025: 0 modpacksAug 2025: 0 modpacksSep 2025: 0 modpacksOct 2025: 0 modpacksNov 2025: 0 modpacksDec 2025: 0 modpacksJan 2026: 0 modpacksFeb 2026: 7 modpacksMar 2026: 12 modpacksApr 2026: 17 modpacksMay 2026: 114 modpacksJun 2026: 110 modpacksJul 2026: 79 modpacksAug 2026: 66 modpacksSep 2026: 49 modpacks
    Oct 2024Oct 2025Sep 2026
    Modpacks that released a new version with this project, each month
    Oct 20240
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    Dec 20240
    Jan 20250
    Feb 20250
    Mar 20250
    Apr 20250
    May 20250
    Jun 20250
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    Jan 20260
    Feb 20267
    Mar 202612
    Apr 202617
    May 2026114
    Jun 2026110
    Jul 202679
    Aug 202666
    Sep 202649

    More modpacks put it in their new versions than a year ago: 73 a month now, 0 a year agoThe average of the last 6 months, compared with the same 6 months a year before. We say it only when the change is large..

    296 modpacks include Envelope in at least one of their versions. Here are the 30 most downloaded.

    ModpackDownloadsLast version with it
    Sensible MC179K downloadslast version with it 22 Jul 2026Immersive Cobblemon | With Distant Horizons, CobbleBrain, Cobblemon Addons & Quests (Cobblemon v1.8)40K downloadslast version with it 15 Oct 2026Reach For The Skies - A Create Experience!33K downloadslast version with it 11 Jun 2026FOXY COZY28K downloadslast version with it 14 Sep 2026EL MINE MAS INMERSIVO 218K downloadslast version with it 21 Aug 2026Arcadia Cobblemon Modpack13K downloadslast version with it 18 Sep 2026The Warborn Realms11K downloadslast version with it 12 Oct 2026Folklore SMP9.1K downloadslast version with it 17 Oct 2026Dawn Community pack8.2K downloadslast version with it 4 Jul 2026Create Aeronautics Skyforge Chronicles5.8K downloadslast version with it 28 May 2026
    1 to 10 of 30123

    Often in the same modpacks

    Mods that modpacks often add together with Envelope. Share: how many of the modpacks with Envelope also have that mod.

    ProjectTypeShareGrade
    Create AeronauticsBModin 62% of the modpacks with EnvelopeCreate: Copycats+AModin 58% of the modpacks with EnvelopeLithiumAModin 58% of the modpacks with EnvelopeAmendmentsAModin 57% of the modpacks with EnvelopeChippedCModin 57% of the modpacks with EnvelopeExposureAModin 53% of the modpacks with EnvelopeHandcraftedCModin 53% of the modpacks with EnvelopeChat HeadsAModin 52% of the modpacks with EnvelopeCreate DecoBModin 50% of the modpacks with EnvelopeCreate: Enchantment IndustryAModin 49% of the modpacks with Envelope
    1 to 10 of 30123

    Latest files

    The newest file for each Minecraft version and loader. The files for recent versions come first. Recent versions: those released in the last 2 years, plus 1.20.1 and 1.21.1, among the most played in modpacks.

    MinecraftLoaderVersionSecuritySendsRequires
    1.21.1·Fabric0.8.00.8.0 · envelope-fabric-1.21.1-0.8.0.jarSends: Nothing about youRequires:Fabric API, Forge Config API PortFabric API, Forge Config API PortPassedOur checks found nothing harmful in this file. Its code was read too.
    1.21.1·NeoForge0.8.00.8.0 · envelope-neoforge-1.21.1-0.8.0.jarSends: Nothing about youRequires:NothingPassedOur checks found nothing harmful in this file. Its code was read too.

    26 releases

    MinecraftLoaderVersionReleasedSecurityGet it onDownload
    1.21.1The latest file for its Minecraft version and loader·NeoForge0.8.00.8.0 · envelope-neoforge-1.21.1-0.8.0.jar (main file)·20 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.4 MB
    1.21.1The latest file for its Minecraft version and loader·Fabric0.8.00.8.0 · envelope-fabric-1.21.1-0.8.0.jar (main file)·20 Oct 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.2 MB
    1.21.1·NeoForge0.7.50.7.5 · envelope-neoforge-1.21.1-0.7.5.jar (main file)·15 Aug 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.1 MB
    1.21.1·Fabric0.7.50.7.5 · envelope-fabric-1.21.1-0.7.5.jar (main file)·15 Aug 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.9 MB
    1.21.1·Fabric0.7.40.7.4 · envelope-fabric-1.21.1-0.7.4.jar (main file)·10 Aug 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.8 MB
    1.21.1·NeoForge0.7.40.7.4 · envelope-neoforge-1.21.1-0.7.4.jar (main file)·10 Aug 2026PassedOur checks found nothing harmful in this file. Its code was read too.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.1 MB
    1.21.1·NeoForge0.7.30.7.3 · envelope-neoforge-1.21.1-0.7.3.jar (main file)·8 Aug 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.1 MB
    1.21.1·Fabric0.7.30.7.3 · envelope-fabric-1.21.1-0.7.3.jar (main file)·8 Aug 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.8 MB
    1.21.1·Fabric0.7.20.7.2 · envelope-fabric-1.21.1-0.7.2.jar (main file)·27 Jul 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 1.8 MB
    1.21.1·NeoForge0.7.20.7.2 · envelope-neoforge-1.21.1-0.7.2.jar (main file)·27 Jul 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Stable · 2.1 MB
    1.21.1·Fabric0.7.10.7.1 · envelope-fabric-1.21.1-0.7.1.jar (main file)Beta·23 Jul 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Beta · 1.8 MB
    1.21.1·NeoForge0.7.10.7.1 · envelope-neoforge-1.21.1-0.7.1.jar (main file)Beta·23 Jul 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Beta · 2.1 MB
    1.21.1·Fabric0.7.00.7.0 · envelope-fabric-1.21.1-0.7.0.jar (main file)Beta·21 Jul 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Beta · 1.8 MB
    1.21.1·NeoForge0.7.00.7.0 · envelope-neoforge-1.21.1-0.7.0.jar (main file)Beta·21 Jul 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Beta · 2.1 MB
    1.21.1·NeoForge0.6.20.6.2 · envelope-neoforge-1.21.1-0.6.2.jar (main file)Beta·11 Jun 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Beta · 1.6 MB
    1.21.1·Fabric0.6.20.6.2 · envelope-fabric-1.21.1-0.6.2.jar (main file)Beta·11 Jun 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Beta · 1.3 MB
    1.21.1·NeoForge0.6.10.6.1 · envelope-neoforge-1.21.1-0.6.1.jar (main file)Beta·7 Jun 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Beta · 1.6 MB
    1.21.1·Fabric0.6.10.6.1 · envelope-fabric-1.21.1-0.6.1.jar (main file)Beta·7 Jun 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Beta · 1.3 MB
    1.21.1·Fabric0.6.00.6.0 · envelope-fabric-1.21.1-0.6.0.jar (main file)Beta·16 Apr 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Beta · 1.3 MB
    1.21.1·NeoForge0.6.00.6.0 · envelope-neoforge-1.21.1-0.6.0.jar (main file)Beta·16 Apr 2026PassedOur checks found nothing harmful in this file.Open this file on ModrinthOpen this file on CurseForgeDownload · Beta · 1.5 MB
    1 to 20 of 2612

    Quick fixes

    In the last 2 years, 2 releases needed a quick fix: a new release within 3 days to fix a problem. This lowers the grade by 1 point.

    See them, newest first

    Quick fixesReleases followed within 3 days by a new release that fixes a problem in them.2

    • Envelope - Fabric 1.21.1 - 0.7.410 Aug 20260.7.4 - 2026-08-10 Fixed item dupe related to packages. Containers are hard…
    • Envelope - NeoForge 1.21.1 - 0.7.123 Jul 20260.7.1 - 2026-07-23 Fixed service crafting returning the input package instead of a…