Hi!
I have an interesting question about the safety mechanisms behind the gmail 
service.

As we all know that, almost every mail service provider has adopted the 
tradition of non-captcha-test in the mail login page. This is pretty 
convenient for users to quick type their personal security information and 
get to their mails as soon as possible. 

But what if a malicious user or a automated program try to break the user 
passwords, with no captcha test, those bad-asses can try unlimited 
passwords combinations to test its correctness. I have tried this on the 
gmail login page by deliberately typing the wrong password. Gmail only 
notifies me this is the wrong username or password, no other alert is 
given. So I can try this theoretically for limitless times. But during the 
process, no precaution measures are taken for the real user. And the real 
user has no information about the possible intrusion.

So does google has some methods like background checking or tracking to 
alert this to the user? Or perhaps, after a certain time of trials, a 
captcha test should be displayed on the login page to prevent the attacker 
to brutal-force the password.

I definitely believe google has the most secure possibly code to do this. 
It would be nice if somebody explain that to me a little bit.
Thanks you guys for reading this. I am just very curious about this. ;)

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