Nextcloud, first-class.
01Create Talk rooms from a thread, attach files directly from your cloud, and keep Contacts, Calendar, Notes, and Tasks synced. No plugins.
All projects
Early releases · v0.4
Unkai Mail
A modern desktop mail client built for people who live inside Nextcloud. Encrypted end to end, native from the ground up.
The pitch
Existing mail clients treat Nextcloud like an afterthought — if they handle it at all. Unkai Mail flips that. Talk, Files, Contacts, Calendar, Notes, and Tasks are first-class citizens of your inbox.
What makes it different
Six ideas, executed seriously.
Standards-based.
02IMAP, SMTP, JMAP, CardDAV, CalDAV. Your data stays portable and self-hostable.
Encrypted, end to end.
03OpenPGP and S/MIME wired all the way through — send, receive, verify. Secrets live in your OS keychain, and the local mail cache is encrypted at rest.
Profiles.
04Work, private, a shared mailbox — fully separate mail universes with their own accounts, encrypted caches, and windows. Run them side by side.
Bring your own AI.
05Optional and off by default. A local MCP server lets an agent you choose search mail or draft replies under per-tool permissions — and there is no send tool, ever.
Native performance.
06Rust on Tauri 2. Fast to start, light on memory, respectful of your battery.
Under the hood
The stack.
A Rust workspace of focused crates, wrapped in a Tauri 2 shell. Each layer is testable in isolation, so the messy parts of mail stay contained.
- Core
- Rust workspace
- Shell
- Tauri 2
- UI
- Svelte 5 · Skeleton
- Targets
- macOS · Linux · Windows
- Storage
- SQLCipher (encrypted SQLite)
- Protocols
- IMAP · SMTP · JMAP · CalDAV · CardDAV
Where we are
Early releases. Rough edges included.
The foundations are in: mail over IMAP, SMTP, and JMAP, end-to-end encryption with OpenPGP and S/MIME, an encrypted local cache, and the full Nextcloud suite — Talk, Files, Contacts, Calendar, Notes, Tasks. Signed installers for Windows, macOS, and Linux ship on every release, and a built-in updater keeps them current. It's not yet hardened for daily-driver use — try it, break it, and tell us what you find.