I have a mail script using PHP on our company's web server (remotely hosted unfortunately

). I have a second part to the script that emails a message back to the sender (an autoresponder if you will). Whenever the autoresponder sends, it uses an account called "Nobody". It's not impractical (from a technical standpoint), however, from a marketing standpoint it is ugly. Is there any way I can change this?
My code for the autoresponder portion:
//new mail for autoresponder
$to = $Email; //$Email is from the form.
$sub = "Thanks for Your Inquiry!";
$mh = "From prinscountertops.com";
$msg = "Thank you for your inquiry. A representative from --------- will be with you shortly.";
mail($to, $sub, $msg, $mh);