https://github.com/aster-privacy/aster-mail
Cross-platform encrypted email client for Aster
https://github.com/aster-privacy/aster-mail
cryptography email encryption end-to-end-encryption privacy
Last synced: 17 days ago
JSON representation
Cross-platform encrypted email client for Aster
- Host: GitHub
- URL: https://github.com/aster-privacy/aster-mail
- Owner: Aster-Privacy
- License: agpl-3.0
- Created: 2026-01-25T21:47:51.000Z (5 months ago)
- Default Branch: main
- Last Pushed: 2026-06-01T16:23:31.000Z (17 days ago)
- Last Synced: 2026-06-01T18:00:25.569Z (17 days ago)
- Topics: cryptography, email, encryption, end-to-end-encryption, privacy
- Language: TypeScript
- Homepage:
- Size: 14.6 MB
- Stars: 18
- Watchers: 2
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
- Security: SECURITY.md
Awesome Lists containing this project
README
# Aster Mail
Aster Mail is a free, open-source, end-to-end encrypted mail service. Every message subject line and attachment is encrypted locally on your device. This means we have no way to read your email and we never will.
You can sign up at [astermail.org](https://astermail.org). A phone number and recovery email are not required.
## How it works
All Aster-to-Aster messages are end-to-end encrypted using the standard OpenPGP (RSA-4096). Subject lines are also encrypted. This means that we cannot read your subject lines, unlike other providers. Aster-to-Aster messages also use ML-KEM-768 inside an X3DH/Double Ratchet protocol, this provides complete post-quantum protection.
Your keys are yours, and they are fully portable. You can export them and use them with any compatible PGP client, such as Thunderbird or GPG. Public keys are published via WKD and key servers automatically, so encrypting to other Aster users just works.
Aster runs a zero-access architecture system that is located in Germany. This means we store nothing we could hand over, even if we were compelled.
## Getting started
Head over to [astermail.org](https://astermail.org) to create a free account. If you would like to contribute code to Aster, please see [CONTRIBUTING.md](https://github.com/Aster-Privacy/.github/blob/main/CONTRIBUTING.md) for instructions.
## Community
Join our [Discord](https://discord.gg/R4XqRUfgWZ) to give honest feedback, ask any questions, and contribute to the privacy community. You can also find us on [Twitter/X](https://twitter.com/asterprivacy) and [Reddit](https://www.reddit.com/r/AsterPrivacy).
If you have any questions or security disclosures, email us at [hello@astermail.org](mailto:hello@astermail.org) or [security@astermail.org](mailto:security@astermail.org). **Do not open a public issue for security vulnerabilities.** Read [SECURITY.md](SECURITY.md) for the full security vulnerability disclosure process.
## Contributing
We welcome contributions of all kinds. Read [CONTRIBUTING.md](https://github.com/Aster-Privacy/.github/blob/main/CONTRIBUTING.md) before opening a pull request.
By contributing to any Aster repository, you agree that your contributions will be licensed under [AGPL v3](https://www.gnu.org/licenses/agpl-3.0.en.html).