How to add captcha to "Printer, e-mail and PDF versions" email form I am using the Printer, e-mail and PDF versions module to enable user to share pages on my d6 website. 
Now I  have recently noticed that some robots make thousands of requests on this form a nd I need a captcha to prevent it. How can I do that?

Thanks
I just added my send form ID to the CAPTCHA form list, and it worked fine.