The headers work properly when I test with other mail like Gmail or Hotmail. But it does not work with Yahoo.
$headers = "From: $Itm_2 $Itm_3 <someone@yahoo.com>" . "\r\n";
$headers .= "Content-type: text/html\r\n";
//Send Mail to Owner
@mail($owner_email,"Website Contact From $Itm_2 $Itm_3",$UserData,$headers);