Haha, I did the exact same thing and found the exact same messages. I thought maybe they were fake, but looking into them they look legit.
Good job, Google!!
Good job, Google!!
those emails were sent from no-reply@accounts.I.google.com
Why is this message in Spam? It has a from address in accounts.l.google.com but has failed accounts.l.google.com's required tests for authentication.
what are required tests for authentication?