[Plugin: Contact Form 7] A test to prevent mail from being sent

I would like to be able to perform a test on a form that is completed and after SUBMIT is clicked, such as

IF [email] CONTAINS “@hotmail.com” THEN FAIL (i.e., do not send)

or

IF [answer] EQUALS “no” THEN FAIL

Is there a way to do this?

Thank you

http://wordpress.org/extend/plugins/contact-form-7/