letter-opener

Install command: 
brew install --cask letter-opener

Name: Letter Opener

Display winmail.dat files directly in Mail.app

https://winmail.help/

/api/cask/letter-opener.json (JSON API)

Cask code on GitHub

Current version: 15.0.2

Requires: macOS >= 10.14

Analytics:

Installs (30 days)
letter-opener 3
Installs (90 days)
letter-opener 18
Installs (365 days)
letter-opener 50
Fork me on GitHub