fmail2

Install command: 
brew install --cask fmail2

Name: FMail2

Unofficial native application for Fastmail

https://fmail.arievanboxel.fr/

Cask JSON API: /api/cask/fmail2.json

Cask code: fmail2.rb on GitHub

Current version: 2.8.9

Requirements: macOS >= 12

Analytics:

Installs (30 days)
fmail2 3
Installs (90 days)
fmail2 37
Installs (365 days)
fmail2 263