i'm planning to create a form with the webform module on D7. i would like to be able to send via e-mail a link to that webform, but only those who receive that link (non-registered users) could access and fill the form. i don't like to expose the form to general public of the website.
i know how to do this with registered users, it would be straight forward with permissions, but don't know how to achieve this with non-registered ones.
what would be the way to do this?