Captcha bypass?

Tonight I found a lot of connections on my ejabberd server. I am using captcha generated as described in documentation. May be spammers knows how to bypass this captcha? Now I banned mostly annoyed hosts but this is not the right way. I looked at roster of this new accounts - all of them contains @gmail.com contacts.

I'll try to use reCAPTCHA instead current script after I'll sleep some time.

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