Internet is so great, but it can easily be misused. We got tired of having our webforms spammed, so we added Captcha verification to abcOnline-CMS.
Captcha (Completely Automated Public Turing test to tell Computers and Humans Apart) creates a picture with four characters that the user must enter to verify that the webform is not filled out automatically by a computer.
In abcOnline-CMS, the designer of the webform can automatically decide if the Captcha shall be turned on or not. You may want to leave it off to avoid irritating the users, but if you get 100's of automatic mails, as we did, you may turn it on and thereby stop the spamming.