Quick answers.

Encrypted by default. End-to-end email without the manual setup. Modern code, not a 20-year-old codebase.

The message goes through as regular email — encrypted on your machine, plaintext over the wire, same as any other client. End-to-end encryption needs Gratin on both ends. The more of your contacts run it, the more of your inbox is unreadable to your provider.

Yes — Gratin connects to any IMAP/SMTP provider with an app password. Mail to other Gratin users is end-to-end encrypted regardless of provider. Mail to non-Gratin users sends as ordinary email, same as Thunderbird or Apple Mail.

You lose your data. No master key, no recovery. Use a password manager.

Personal use is free. Organizations — newsrooms, law firms, NGOs, family offices, anyone deploying Gratin for work — pay a per-seat license. Same binary, no feature gates. Details on the for-teams page.

Yes, for the foreseeable future. If that ever changes, existing users keep the version they have. We're not in the business of taking things away after you've installed them.

The source is published. The signing key fingerprint is published. If Chicon ever shuts down, the code keeps building and the binaries you already have keep working forever — Gratin has no server component to take down. We'll also publish the signing keys in that case so the community can continue releases.

Apple's Developer Program approval has lead time we can't predict. Rather than ship an unsigned macOS build that triggers Gatekeeper warnings, we're waiting. macOS lands when we can sign it properly. No ETA published.

Web apps can't hold encryption keys safely — they're at the mercy of the browser, the network, and a server you have to trust. Gratin's threat model rules that out. Desktop only, always.

Gratin imports your Thunderbird account configurations on first run. Mailbox migration via mbox import is on the v1.1 roadmap; until then, IMAP folders re-sync from the server. See the docs for details.

Not in v1. Different threat model. May build later, no promise.