PawelP on "[Plugin: Contact Form 7] How to prevent empty text fields from sending??"

Hi there, I have a large form with many optional text fields. Is there a way to prevent the fields that are left empty from sending? (the received form would only include fields that were filled up by sender and the once that were left empty would not even show up in the e-mail)
thank you for your time!

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