I really had some expectations about this security feature but....
Heads up: Today, we’re launching a new feature to help people identify phishing emails claiming to be from Instagram. This account security feature (accessed through Settings) allows anyone to check if an email claiming to be from Instagram is genuine.
99% of the people who are tricked by phishing emails don't even bother to check who the sender is, they would click the links even if the sender is Elvis Presley.
Really expected something more
high-tech, not a log in a menu four taps away.
Probably a small alert in the Instagram app, a small red
! in the corner which pressed would inform the user that he has no emails from Instagram and he shouldn't trust anything, which would turn green and alert when a real one is sent.