7
Did you receive the forms from an anonymous user (it is marked in the mail)?
Are you sure the captcha displayed for anonymous users?
Did you test it? (Try to enter a wrong or no code to see if the entry got rejected).
Is it the captcha from Frameworks that is used by your Formulaire?
You can then change some things in /Frameworks/captcha/configs.php for making it more difficult.
Check that
le="color: #000000"><?php "mode" => 'image',
else it would be possible to automate.