FormMail Captcha

This is where you can signup for the keys https://www.google.com/recaptcha/admin#whyrecaptcha

Referrers and Recipients

Make sure the customer has this set up properly as well

#whatever domains they decided to use should go in referrers.
@referers = ('www.domain.com','domain.com');

# @recipients defines the e-mail addresses or domain names that e-mail can   #
# be sent to.  This must be filled in correctly to prevent SPAM and allow    #
# valid addresses to receive e-mail.  Read the documentation to find out how #
# this variable works!!!  It is EXTREMELY IMPORTANT.                         #
# If we are troubleshooting the receiving make sure this has a string of the email and not a variable #
@recipients = '[email protected]';

Use LWP

This will need to be put just before it shows all the &check's down the page

use LWP::UserAgent;

Calling the Check Captcha

You can add this anywhere near &check lines

# Check the captcha challenge and response.
&check_captcha;

Checking the Captcha

This actually checks the captcha that was typed in

##############################################################################
# Check the CAPTCHA response via the reCAPTCHA service.
sub check_captcha {
 
      my $ua = LWP::UserAgent->new();
     my $result=$ua->post(
     'http://www.google.com/recaptcha/api/verify',
      {
          privatekey => 'your_private_key',
          remoteip   => $ENV{'REMOTE_ADDR'},
          challenge  => $Form{'recaptcha_challenge_field'},
          response   => $Form{'recaptcha_response_field'}
      });

      if ( $result->is_success && $result->content =~ /^true/) {
              return;
      } else {
              &error('captcha_failed');
      }
}