Envelope [Unofficial Port]

Added

• Added the Courier Bat for night deliveries. Mailboxes can employ nearby Bats or summon one when needed; Mail Service deliveries use Bats at night. A Bat switches between courier roles at the virtual hub if the time changes during a delivery.
• Added a Spider Eye food slot for Bats, Bat courier visuals and sounds, and the "The Pigeons and the Bats" advancement. Each Bat can complete up to three deliveries; its delivery count is saved.
• Added the Soulbound Seal Stamp, crafted by combining a Seal Stamp with an Echo Shard. It has eight uses and returns as the original stamp with its wax and die preserved.
• Added persistent seal locks and /envelope seal_lock create|unlock|list. Locks can be used by Soulbound Seals or assigned to other seals for custom uses; create accepts either an owner name or an existing owner#uuid lock ID.
• Added all 16 colored Seal Stamp designs and separate Gold Stamp artwork. Added the cube, letter_and_quill, and skull_and_bones designs and their Mail Service recipes; the cube recipe requires a Grass Block.
• Added JEI notes for broadcast and payback-cancellation recipes, clickable service addresses, and previews for the dye-specific Seal Stamp recipes.
• Added the original recipient to delivered-mail tooltips and the original Halloween spiderweb decoration to empty mailboxes.

Changed

• Replaced the port's initial custom seal-coloring approach with the original colored wax backgrounds, impression palettes, and stamp artwork from upstream.
• Increased background Pigeon travel speed from 20 to 25 blocks per second; Bat speed defaults to 50 blocks per second.
• Added server settings for Bat delivery limits, Soulbound Stamp availability/uses/locks, seal removal time, delivery phase duration, and Mail Service courier-death notices. Unified courier damage evasion and replaced the old courier spawning-rule option. Review the regenerated server configuration after updating; renamed settings may need to be reapplied.
• Moved send and broadcast commands under /envelope mail; sending supports optional sender and recipient addresses. Added /envelope debug terminate_all_deliveries confirm with explicit confirmation.
• Moved seal artwork to animated GUI sprites and changed seal material/symbol definitions to use sprite references. Legacy texture fields remain readable. Seal data can now include an optional lock.
• Added material-specific seal glint (Gold) and animated Sculk wax, the original stamp sound, and lock overlays. The preview lock symbol reflects lock data on the item and may remain visible after an administrator deactivates the lock.
• Increased the visibility distance of courier arrival/departure particles and made couriers play their ambient sound when a delivery finishes.
• Removed the Slimeball requirement from the Automated Supply Service Letter and Writable Book recipes. The Seal Stamp recipe now uses honeycomb, planks, and an iron ingot.

Fixed

• Fixed the Mail Service recipes for the cube, letter-and-quill, and skull-and-bones Seal Stamps failing to load.
• Fixed Soulbound Seal Stamp previews, including Sculk animation and Creative-inventory stamps defaulting to Sculk.
• Restored native animated-sprite rendering for Sculk wax so its interpolation metadata is honored; Gold glint keeps its upstream animated sequence and intentional pauses.
• Fixed Soulbound stamps obtained directly in Creative so they can seal mail without a crafting-added material component.
• Fixed the Soulbound Seal death-protection mixin for the target game's inventory list method signature.
• Fixed bulk-expiring payback mail by returning items from a snapshot while removing expired entries.
• Removed an unused service-address tick callback.

This release adapts selected features from the original creators' Envelope 0.8.0 Snapshot 1 and Snapshot 2. See Credits for the original project and creators.