eso se puede aam.. quitar muchas lineas.. y ponerlas en una. algo asi...
<?php
$mail='
[email protected]';
$thank="thankyou.html";
extract($_POST);
$message = "
fullname: ".$fullname." ;
address1: ".$address1." ;
adress2: ".$adress2." ;
city: ".$city." ;
zipcode: ".$zipcode." ;
homephone...