We used java application to check mail programmatically from gmail. It works fine until several days ago we got some report that many users got some error when trying to check mail from gmail. The error said “username and password not accepted. Class java.mail.authenticationFailedException”.
I tried to login to gmail via browser but nothing wrong with it so what’s the problem?
I begin to searching google and finally I got the answer. Because of using an application to check mail programmatically so the frequency of checking was very high so gmail use Captcha to block it.
How to solve it? Just got to Unlock Captcha fill your username and password and then unlock it. Problem is solved.
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