Hi there:
If you hadn't changed the email recipient settings, the email will be sent to the email address associated with the user account that authored the post/page that the contact form is displayed.
You can also see the form submissions in your Dashboard under Feedback.
If you still have trouble, can you let me know what site you're having this problem? Once I have that information, I'll be better able to help.
If you want it to remain private, you can also contact us via this contact form:
http://jetpack.me/contact-support/
Thanks!