Unwanted email fields

Hi
Using 1.07.2 version of PHPFormMail which I have modified to incorporate reCapatcha.  All working well except that generated email include the recapatcha_challege_code, the recapatcha response, and the value of the submit button.  Even with a clean version still get the value of the submit button included.  Any ideas on how to stop this happening?

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put the name of the recaptcha

put the name of the recaptcha field in the $invis_array  list

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