Initial public repo: README, LICENSE, and logo
Sets up the Korax public Gitea presence with a comprehensive README targeting both end users and technical audiences, PolyForm Noncommercial license for the mailcore open-source engine, and the project logo. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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Eugen Kaparulin
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PolyForm Noncommercial License 1.0.0
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Scope: This license applies to the mailcore/ directory of the Korax project.
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All other parts of the Korax project remain proprietary.
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© Eugen Kaparulin. All rights reserved.
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---
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# PolyForm Noncommercial License 1.0.0
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<https://polyformproject.org/licenses/noncommercial/1.0.0>
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## Acceptance
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In order to get any license under these terms, you must agree
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to them as both strict obligations and conditions to all
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your licenses.
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## Copyright License
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The licensor grants you a copyright license for the software
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to do everything you might do with the software that would
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otherwise infringe the licensor's copyright in it for any
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permitted purpose, other than distributing the software or
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making changes or new works based on the software.
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## Noncommercial Purposes
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Any noncommercial purpose is a permitted purpose.
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## Personal Uses
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Personal use for research, experiment, and testing for
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the benefit of public knowledge, personal study, private
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entertainment, hobby projects, amateur pursuits, or religious
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observance, without any anticipated commercial application,
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is use for a permitted purpose.
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## Noncommercial Organizations
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Use by any charitable organization, educational institution,
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public research organization, public safety or health
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organization, environmental protection organization,
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or government institution is use for a permitted purpose
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regardless of the source of funding or obligations resulting
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from the funding.
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## Fair Use
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You may have "fair use" rights for the software under the
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law. These terms do not limit them.
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## No Other Rights
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These terms do not allow you to sublicense or transfer any of
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your licenses to anyone else, or prevent the licensor from
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granting licenses to anyone else. These terms do not imply
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any other licenses.
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## Patent License
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The licensor grants you a patent license for the software that
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covers patent claims the licensor can license, or will be able
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to license, that you would infringe by using the software.
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## Noncommercial Purposes
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Any noncommercial purpose is a permitted purpose.
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## No Other Rights
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These terms do not allow you to sublicense or transfer any of
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your licenses to anyone else, or prevent the licensor from
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granting licenses to anyone else. These terms do not imply
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any other licenses.
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## Violations
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The first time you are notified in writing that you have
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violated any of these terms, or done anything with the software
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not covered by your licenses, your licenses can nonetheless
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continue if you come into full compliance within 32 days after
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receiving notice. Otherwise, all your licenses end permanently.
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## No Liability
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***As far as the law allows, the software comes as is, without
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any warranty or condition, and the licensor will not be liable
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to you for any damages arising out of these terms or the use
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or nature of the software, under any kind of legal claim.***
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## Definitions
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The **licensor** is the individual or entity offering these
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terms, and the **software** is the software the licensor makes
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available under these terms.
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**You** refers to the individual or entity agreeing to these
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terms.
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**Your company** is any legal entity, sole proprietorship,
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or other kind of organization that you work for, plus all
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its affiliates.
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**Affiliates** means the other organizations than a parent
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organization in any way controlling, controlled by, or under
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common control with that organization.
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**Control** means ownership of substantially all the assets of
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an entity, or the power to direct its management and legal
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affairs.
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**Your licenses** are all the licenses granted to you for the
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software under these terms.
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**Use** means anything you do with the software requiring one
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of your licenses.
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**Trademark** means trademarks, service marks, and similar
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rights.
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README.md
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<div align="center">
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<img src="images/korax.png" alt="Korax" width="160"/>
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# Korax
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**PGP-First Email. Private by Default.**
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[](LICENSE)
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[]()
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[]()
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</div>
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---
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Korax is an email client built around a single principle: **encryption should be the default, not the exception.**
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Most clients bolt PGP on as an afterthought — a plugin, a hidden setting, a third-party extension. Korax is designed from the ground up so that signing, encryption, and key management are a seamless part of your everyday workflow. Your mail stays between you and the people you write to.
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---
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## Features
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- **PGP encryption and signing — native, not a plugin.** Compose encrypted mail as naturally as plain text.
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- **TOFU trust model.** "Trust On First Use" with visual indicators: see at a glance whether a contact's key is known, trusted, or changed.
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- **No tracking pixels.** Remote images are blocked by default. Autoload only for contacts whose public key you have saved.
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- **Local-first.** All messages cached in SQLite on your device. Instant load, works offline, nothing sent to any cloud.
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- **Multi-language.** English, German, Spanish, Finnish, Russian, Swedish.
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- **Linux: always free, always fully unlocked.** No paywall, no nag screens. Honor system.
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---
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## Download
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### Linux (AppImage)
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The Linux release is a self-contained AppImage — no installation required.
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1. Download `Korax-x86_64.AppImage` from the [Releases](../../releases) page.
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2. Make it executable:
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```bash
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chmod +x Korax-x86_64.AppImage
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```
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3. Run:
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```bash
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./Korax-x86_64.AppImage
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```
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### macOS · Android · iOS
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Coming soon.
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---
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## Free vs Pro
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| Feature | Free | Pro |
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| Send & receive email | ✓ | ✓ |
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| IMAP accounts | Max 3 | Unlimited |
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| Basic PGP encryption / decryption | ✓ | ✓ |
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| Import PGP identity | ✓ (max 1) | ✓ (unlimited) |
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| Generate PGP keypair | — | ✓ |
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| Keyserver auto-lookup (WKD) | — | ✓ |
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| Custom themes / swipe actions | — | ✓ |
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| **Linux** | **Always Pro** | **Always Pro** |
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Pro is a one-time purchase. All Pro features are free during the current beta period.
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---
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## Under the Hood
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### Architecture
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```
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Flutter UI (Dart)
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│
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flutter_rust_bridge (FFI)
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│
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mailcore (Rust)
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├── IMAP client
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├── SMTP client
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├── SQLite storage
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├── MIME parser
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└── DNS SRV discovery
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```
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The UI layer never blocks: all network and crypto operations run in Rust, communicated to Dart via an FFI bridge with zero copy overhead.
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| Layer | Technology |
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| UI | Flutter / Dart |
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| Core engine | Rust (`mailcore`) |
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| FFI bridge | flutter_rust_bridge |
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| Cryptography | sequoia-openpgp |
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| Local storage | SQLite |
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| State management | Riverpod |
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---
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### mailcore — Open Source Engine
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`mailcore` is the Rust library at the heart of Korax. It handles everything below the UI:
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- **IMAP client** — RFC 3501 compliant, UIDVALIDITY-aware, uses `BODY.PEEK[]` to preserve `\Seen` flag integrity
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- **SMTP client** — RFC 5321 with STARTTLS and SMTPS
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- **SQLite storage layer** — local message cache, folder state, account credentials
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- **MIME parser** — RFC 2045/2046 multipart handling
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- **DNS SRV auto-discovery** — resolves `_imaps._tcp` and `_submission._tcp` before falling back to defaults; same mechanism used by Thunderbird, Evolution, and others
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The source is published here for transparency and community audit. It is licensed under the [PolyForm Noncommercial License 1.0.0](LICENSE) — free to read, study, and use for noncommercial purposes. Commercial use requires a separate agreement.
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**What stays proprietary:**
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The PGP/Sequoia integration, advanced privacy features, and the Flutter UI (`korax/`) are not published. A second Rust library — `mailmore` — will eventually hold additional proprietary engine capabilities.
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---
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## Security
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**Reporting vulnerabilities:** Do not open a public issue. Contact the maintainer directly at the address shown in the application's About screen.
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**Key storage:** Private keys are never written to SQLite or disk in plaintext. On every platform, they are stored in the OS secure enclave (iOS Keychain, macOS Keychain, Android Keystore).
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---
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## About
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Created by **Eugen Kaparulin**.
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Official binaries distributed by **K-Ops Oy**.
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© Eugen Kaparulin. All rights reserved.
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`mailcore` is published under the [PolyForm Noncommercial License 1.0.0](LICENSE).
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All other parts of Korax are proprietary.
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