[pirsquare]

This is the direct link to the guidelines. https://support.google.com/mail/answer/81126

Strange there's no mentioned about transactional emails. Since we wouldn't include unsubscribe link for transactional emails.

[cuu508]

Depends. I suppose it would not make sense to have "unsubscribe" for "reset password" notifications, but for "there's a new event in your account, come log in to see it" type notifications it would.