emclient

Install command: 
brew install --cask emclient

Name: eM Client

Email client

https://www.emclient.com/

/api/cask/emclient.json (JSON API)

Cask code on GitHub

Current version: 8.2.1478

Analytics:

Installs (30 days)
emclient 13
Installs (90 days)
emclient 34
Installs (365 days)
emclient 166
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