Problems with mail ()

[salukigirl]

I Have fixed everything, checked everything and nothing is wrong with my code. But no matter which mail form I code this same error keeps coming up. Try it yourself and see the error. It has something to do with mail () Which I have no idea where that even is or anything. >.<

http://furryfriends.elementfx.com/form.html

[Starshine]

Have you upgraded your PHP? ( http://forums.x10hosting.com/news-an...l-servers.html )

[salukigirl]

No I haven't. but do you think that's what's causing it?
Edit:
Ok I sent a request for it to be upgraded. Is that what is wrong? What do I do until then?
Edit:
My request was denied now what am I supposed to do?!