I dont know about your test site but heres a mail that should work:
$from="Someone <someone@somewhere.com>";
$subject="testing";
$to="fhfanshaw@hotmail.com";
$message="test script";
$headers = "MIME-Version: 1.0\r\n";
$headers .= "Content-type: text/plain; charset=iso-8859-1\r\n";
$headers .= "From:".$from."\n";
mail($to,$subject,$message,$headers);