Post data not received

hi,

I’m trying to send post data to send an email, but, while it works when using the path of my php file

http://www.exam-vision.com/wp-content/themes/sandbox/test.php:

it does not work when using a wordpress page using this php file as a template (when filling the form and sending the data, no post data is received!):

http://exam-vision.com/testmail

Tho PHP code is shown below.

Anybody can help?

Thanks

[Code moderated as per the Forum Rules. Please use the pastebin]