postbox

Install command: 
brew install --cask postbox

Name: Postbox

Email client focusing on privacy protection

https://www.postbox-inc.com/

Development: Pull requests

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

Cask code: postbox.rb on GitHub

Current version: 7.0.65 (auto-updates)

Requirements: macOS

Artifacts:

Artifact Type Platform
Postbox.app -> /Applications/Postbox.app App Default platforms
postbox is built for Intel macOS and requires Rosetta 2 on Apple Silicon.
Install Rosetta 2 with softwareupdate --install-rosetta --agree-to-license. Rosetta 2 is difficult to remove once installed.

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