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. A phone number and recovery email are not required.
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.
Head over to astermail.org to create a free account. If you would like to contribute code to Aster, please see CONTRIBUTING.md for instructions.
Join our Discord to give honest feedback, ask any questions, and contribute to the privacy community. You can also find us on Twitter/X and Reddit.
If you have any questions or security disclosures, email us at [email protected] or [email protected]. Do not open a public issue for security vulnerabilities. Read SECURITY.md for the full security vulnerability disclosure process.
We welcome contributions of all kinds. Read CONTRIBUTING.md before opening a pull request.
By contributing to any Aster repository, you agree that your contributions will be licensed under AGPL v3.