# Install letter-opener with Homebrew Cask

Display winmail.dat files directly in Mail.app. Version 16.0.7 via Homebrew Cask; verified from local package data.

## Install

```sh
sudo av install cask:letter-opener
```

Additional install commands:

### macOS

- Homebrew Cask (100%):

```sh
brew install --cask letter-opener
```

  Evidence: local Homebrew cask metadata

## Package facts

- **Package key:** cask:letter-opener
- **Package manager:** Homebrew Cask
- **Package manager page:** <https://formulae.brew.sh/cask/letter-opener>
- **Version:** 16.0.7
- **Source summary:** Display winmail.dat files directly in Mail.app
- **Homepage:** <https://winmail.help/>
- **Upstream docs:** <https://winmail.help/>
- **Source archive:** <https://s3.amazonaws.com/LetterOpener/dmg/Letter-Opener-16.0.7.zip>
- **Generated:** 2026-08-04T22:13:35+00:00

## Install behavior

- Post-install hook: not defined
- Bottle: not available

## Freshness

- Page generated: 2026-08-04
- Package-manager version: 16.0.7
- Local data: ok
- Upstream repository: https://winmail.help/
- info: No package-manager update timestamp was available.
- info: Release/tag comparison is only available for GitHub repositories.

## Security Notes

No matching local secret-handling manifest was found for letter-opener. Package metadata is still published here so future coverage has a stable package URL.


## Source Database Details

- **Source Database:** Homebrew cask API
- **Tap:** homebrew/cask
- **Full Token:** letter-opener
- **Names:** Letter Opener
- **Artifacts:** Pkg: 1, Uninstall: 1, Zap: 1
- **Deprecated:** no
- **Disabled:** no


## Related links

- [Homebrew Cask packages](https://pkg.so/homebrew-cask-packages/) - Generated from Homebrew Cask package-manager metadata.

## Sources

- package-page enrichment
- package version freshness
- package relationship graph
- cross-ecosystem install command graph