We built an encrypted email client with post-quantum cryptography

We have been building an unprecedented end-to-end encrypted email service where we, by design, cannot read your mail. No other encrypted email service has post-quantum cryptography in production that works with any email provider, not just their own users. Client-side encryption with post-quantum cryptography, zero-knowledge architecture, fully open source under AGPL v3, servers in Germany. We're releasing soon and you can join the waitlist today: https://astermail.org/ We built Aster Mail because we wanted end-to-end encrypted email that's actually private. All encryption and decryption happens client-side. We encrypt email content, subjects, contacts, folder structure, search indices, timestamps, and attachment data before anything touches our servers. Minimal routing metadata (sender/recipient addresses) is required for SMTP delivery, but we encrypt everything we can beyond that. On top of standard PGP, we include post-quantum cryptography by default, protecting against store-now-de