TurtleMail mixed-origin copyright and license notice

This repository contains material from multiple origins.

1. Original modifications and documentation authored by Dusk-92
   Copyright (c) 2026 Dusk-92.
   All rights reserved unless a specific file states otherwise.

2. Historical and upstream TurtleMail / Mail code
   Significant portions of this repository descend from:
   - https://github.com/shirsig/Mail
   - https://github.com/sica42/TurtleMail

   No explicit project-wide license was identified in either upstream
   repository during the 2026-08-31 provenance audit.

   This file does NOT relicense inherited code and does not grant rights that
   the applicable original copyright holders did not grant.

3. Visual assets, trademarks, and game-facing material
   These remain subject to their respective rights holders. The presence of a
   file in this repository does not by itself establish ownership or a right to
   relicense any underlying third-party or game-derived asset.

World of Warcraft, Warcraft, Blizzard Entertainment, Turtle WoW, and associated
names, marks, artwork, and game assets remain the property of their respective
rights holders.

See THIRD_PARTY_NOTICES.md, PROJECT_IDENTITY.md, and Docs/ for provenance and
scope details.