Don't know if it's the right section to post it, but here I go anyways:
You've set up a scam, and some people try to discover your gmail password to get the goodies you scammed (keys / accounts / whatever). The problem is that once someone tries to access your account, providing a wrong password too many times, it gets "blocked" and you need to unlock it with a simple captcha.
Gmail doesn't ask you to do so by default when you try to log onto your account via their website. But you can't access your account with your mail client, you'll always get an error similar to this (even though your password works perfectly for web access):
Code:
Account: 'Youraccount', Server: 'pop.gmail.com', Protocol: POP3, Server
Response: '-ERR [AUTH] Username and password not accepted.', Port: 995,
Secure(SSL): Yes, Server Error: 0x800CCC90, Error Number: 0x800CCC92
To be able to access your gmail account from your mail client again, you need to unlock it, here is the link to do so: https://www.google.com/accounts/DisplayUnlockCaptcha
Hope it helped!
Achi3