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You have 2 choices:
- a separate form data filtering and signing service
Since the latter is less accurate than ReCAPTCHA and I doubt you have the in-house expertise to build it (no offense meant -- it is not easy) I've gotta refer you back to the technology specifically designed to deal with your situation. You may not *want* it, but sure sounds like you need it.
Thanks San, the filter we've implemmted in the program flow seems to be working fine