No longer maintained
I recommend using Have I Been Pwned's Domain Search feature instead.
This project allows G Suite admins to quickly check their entire G Suite directory (emails) against https://haveibeenpwned.com. It uses OAuth 2 (Sign in with Google) and allows you to see which of your users have possibly had their accounts breached.
The project currently supports signing in with Google, retrieving the entire G Suite directory, and checking individual emails against Have I Been Pwned. It all happens under the hood at the moment with no UI for anything.
Task
might suffice).