FioriDiZucca on "[Plugin: Contact Form 7] Form emails not send"

Hi,
I install the plug-in and set the form correctly but when I write an e-mail from the site appear the green box that confirm the delivery but i don't receive emails...

My wordpress is installed in a folder on the domain.
Is that the problem? Can I fix it?

The contact page is that:

http://www.fabiognessi.it/home/?page_id=121

Thanks for the support!

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