A native GTK 4 / libadwaita email client for GNOME, written in Rust.

• Multiple IMAP/SMTP accounts, or accounts imported from GNOME Online Accounts (OAuth)
• A unified inbox across every account, plus each account's own folder tree
• Individual emails, full-text search, load-on-scroll history
• Pinned emails stay at the top of the list, in sync with Outlook through graphmail-bridge (the $Pinned keyword)
• Rich-text composer with attachments, Outbox with retry, one-click unsubscribe
• Follows the system accent colour and light/dark style
• On Omarchy, follows the desktop theme live (below)

Needs cargo, GTK 4 ≥ 4.18, libadwaita ≥ 1.8, WebKitGTK 6.0, blueprint-compiler, glib-compile-schemas (glib2), sqlite is bundled.

cargo run -p rustle      # run from the checkout — no install needed
just check               # clippy + fmt + tests
sh install.sh            # install to ~/.local (PREFIX=/usr for system-wide)

RUSTLE_LOG=debug turns on logging. Data lives in $XDG_DATA_HOME/rustle/rustle.db, passwords in the system keyring, settings under the io.github.turbinebmw.Rustle schema.

Where an Omarchy theme is present, Preferences → Follow Omarchy Theme (on by default) takes the window colours, accent and light/dark style from the active desktop theme and follows every omarchy theme set live, links in the reader and composer included. The palette is read straight from ~/.local/state/omarchy/current/theme/colors.toml with the same fallbacks omarchy-theme-color applies, legacy color0..color15 themes included. Turn it off and Rustle is back on the system accent and style.

A theme can take full control by shipping a rustle.css (plain GTK CSS setting libadwaita's variables), either in the theme directory or generated from a ~/.config/omarchy/themed/rustle.css.tpl template; it is used verbatim in place of the derived palette.