Documentation
Install Komorebi, add your accounts, and learn how its mail, contacts, calendar and rules work and what it sends where.
On this page
Komorebi is a small, fast email client for Windows 10 and 11. It is free and open source (GPL-3.0-or-later), written in Rust with Slint, and keeps a local SQLite cache of your IMAP mail. It has no AI, no telemetry and no web engine: HTML mail is drawn by its own layout engine.
Start here
- Getting started: download, check and install Komorebi, and what the first start shows.
- Adding an account: Purelymail, Postale.io and any other IMAP and SMTP server.
Using Komorebi
- Composer and signatures: formatted mail, recipients, attachments, drafts, sending and named signatures.
- Rules: local rules for new Inbox mail, and Copy as Sieve.
- Contacts and calendar: the address book, the calendar, invitations, CardDAV and CalDAV.
- Notifications and tray: new-mail notifications, event reminders, the notification area and start with Windows.
- Keyboard shortcuts: every key, generated from the project's README.
Privacy and security
- Privacy and what leaves your computer: what is stored, what is sent and to whom.
- Updates: how the in-app update finds, checks and installs a new version.
- Certificate pinning and the encrypted cache: self-signed servers and encrypting the mail cache.
More
- Building from source: build the same
komorebi.exeyourself. - FAQ: short answers to common questions.
The full privacy statement is on the Privacy page, and every release is listed in the Changelog.