contact problem

[izti]

When I try to send an email to the admin (by the formular on contact.php) I cant do it. The browser go back to the main page and email is not sent!
The activation of users and telling a friend function work great, so I dont know where the problem is...?

[Scooby]

url where site is so we can take a peek

[izti]

but you havent any suggestions what it can be, without url?