fastmail

Install command: 
brew install --cask fastmail

Name: Fastmail

Email client

https://www.fastmail.com/

Development: Pull requests

Cask JSON API: /api/cask/fastmail.json

Cask code: fastmail.rb on GitHub

Current version: 1.5.1

Requirements: macOS >= 12

Versions:

Intel golden gate 1.5.1
tahoe 1.5.1
sequoia 1.5.1
sonoma 1.5.1
ventura 1.5.1
monterey 1.5.1

Analytics:

Installs (30 days)
fastmail 91
Installs (90 days)
fastmail 291
Installs (365 days)
fastmail 1,402