UserAgent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36

Steps to reproduce the problem:
If we access the url https://mail.google.com/mail/feed/atom in Internet Explorer 11 and enter a valid email account and any password,
To the third attempt Google sends you an email

Email received from Google:

Subject: Check blocked login attempt

Body: Hello Jose Maria,
Google just blocked someone from signing in to your Google account, jm.acuna73@gmail.com, from an application that could put your account in jeopardy.

Do not recognize this activity?
If you have not recently encountered an error while trying to access a Google service, such as Gmail, from a non-Google app, someone may have your password.

(a button to change the password appears)

______________________________________________________________________________________________

To consider:

1- Google warns you: an app that is not from Google may endanger your Gmail account

False: this is https://mail.google.com/mail/feed/atom

2- The message prompts to change the password

3- Only happens with IE (Chrome, Firefox, Opera, do not send email)

What is the expected behavior?
I think it should work just like if trying to access an account from the gmail website

What went wrong?
1- Google warns you: an app that is not from Google may endanger your Gmail account

False: this is https://mail.google.com/mail/feed/atom

2- The message prompts to change the password

Did this work before? N/A 

Chrome version: 55.0.2883.87  Channel: stable
OS Version: 6.3
Flash Version: Shockwave Flash 24.0 r0