# Mail inbox app shell with icon-rail folder sidebar, wide message list, and selected-message action header

> Mail and inbox shell: folder icon rail plus a wide 440px message list with live search, filter tabs, rich preview rows, and a selected-message action header (reply, star, delete). ReUI Badge, shadcn Sidebar, Tabs, Avatar, DropdownMenu.

A paid shadcn/ui block sold by the [@reui](https://reui.io/?utm_source=shadcn.exchange) registry, listed on [shadcn.exchange](https://shadcn.exchange/r/reui/app-shell-4).

- Page, with a preview: https://shadcn.exchange/r/reui/app-shell-4
- Screenshot: https://abzjhwgwpdpz7ua5.public.blob.vercel-storage.com/shots/reui/app-shell-4-light-0a376cb2e5b81d15.png
- Listed: 2026-10-13

## Buy and install

@reui sells this block, and its code is not on shadcn.exchange. Buy it from the registry, which installs it for those who have: https://shadcn.exchange/out/reui/app-shell-4

## Dependencies

- npm packages: `cn`, `next-themes`
- Registry items: `@reui/badge`, `avatar`, `button`, `button-group`, `dropdown-menu`, `input`, `item`, `scroll-area`, `separator`, `sidebar`, `tabs`, `tooltip`