Unfortunatley not, but it includes a anti-spam-bot meassure which works pretty good: by adding a hidden input field to the form. this input field isnt visible for users, but bots tend to fill in something. whenever the input field contains any input the form is not submitted.
That way you got spam prevention and at the same time you are not bothering your users ;)
If you need more than this I would recommend to use a plugin like cforms II