This package adds a blocking dialog to the Contact Us, Create Account and Tell A Friend pages (more pages can be protected if needed). In order to submit the form, a person has to enter in the text displayed in the dialog. This prevents spammers from using these pages to send annoying or dangerous emails. They can still do it if they want but they have to manually complete the whole form, which is a waste of their time, so they move on. If you would like to see it in action, please take a look at our Contact Us page. We liked it so much, we installed it here.
This is code released and managed by google so you can be sure the coding is top-notch.