An alternative way of hiding you data will be to post it to a server, i.e you may try considering posting your feedback data to some php script or a servlet, which later on forwards it to your mailbox.
There are so many free hostings out there, one I use for same purpose is www.3owl.com, I just have a PHP file there, and all the responses and feedbacks from all the websites are submitted there, which are then forwarded to my mailing address.
And, about mails going to Spam, well mailbox are intelligent these days, they can be taught what is not a spam, and what is :)