Contact form never worked:(

Hi,
I have used the demo package to install YourShop template. Since last year, the contact form did not work but I put it on the back burner. Now, I really need for it to work. I have checked all possibilities which I could think of and checked all settings of Joomla with my other working sites that have J1.5 also but I have not found anything wrong yet, the contact form does not end an email to the admin. The send a copy function is working correctly though, can you believe it?
Please help!
Thank you!
Kind regards,
Saeed

Please try to register new user via backend, then you should get mail from system about registration - if you don't get any message you have wrongly configured mail function.