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Aster Mail is an open-source, privacy-focused email service with cross-platform desktop and web clients. It protects messages, subject lines, and attachments between Aster users through local end-to-end encryption. Its cryptographic system combines ML-KEM-768 and P-256 ECDH with X3DH and Double Ratchet protocols for post-quantum protection. Messages sent to external recipients can use OpenPGP encryption when their public keys are available. Users retain control of their encryption keys and can export them to compatible applications. Optional key publishing enables encrypted communication with external contacts. Its zero-access architecture prevents the service from reading protected message contents. Accounts can be created without providing a phone number or recovery email.
Features
- End-to-end encryption of email messages, subject lines, and attachments between Aster users
- Post-quantum cryptography combining ML-KEM-768, P-256 ECDH, and Double Ratchet
- OpenPGP encryption for communicating securely with compatible external email recipients
- Portable encryption keys with optional public keyserver and WKD publishing
- Zero-access email storage architecture with locally encrypted message contents
- Cross-platform desktop and web access without mandatory phone number verification
Project Samples
