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Most encrypted email services leave your subject lines and metadata exposed and unencrypted. Aster Mail encrypts everything, including subject lines, with quantum-safe ML-KEM-768 encryption. Your keys are portable and work with GPG and Thunderbird, with no vendor lock-in.
Aster is open source under AGPLv3, hosted in Germany with a generous free plan.
Try it free at astermail.org
Aster MailQuantum-safe, private end-to-end encrypted, zero access mail