I'm currently job searching, and came across a site that knows when I'm signed into G-mail. A quick look at the login page shows that I can use my Gmail account to login.
Looking at the Google API, it seems they do provide away to access a users inbox with certain examples shown here.
Is there a way to check if these methods and capabilities have been implemented, and if so, how can I minimize the access to my account?
I'm aware I can create an original account on the site, separate from my Gmail account.