Add CAPTCHA to forms made by email field

Hi,
I would like to the same and i found how to do and it work also for for all your form:

check the HTML of the form that you want a captcha (with firebug for example) you will see

This example is for the email field contact form of node/10

<form action="/email/node/10/field_email" method="post" id="email-mail-page-form" accept-charset="UTF-8">
...
</form>

Look at the form id.

Now in admin/config/people/captcha

at the bottom of the table you have an input text,
enter the id of the form but REPLACE dash (-) by underscore (_) (email_mail_page_form for this example )
and choose what kind of capcha you want and save.

REMEMBER
Depends of you right configuration but normally if you are user 1 captcha will not appear so go to the email field form page as anonymous user and you will see the captcha.

Regards
Jo

Thank you,
That method works fine for me