php msql invio dati per email

[andrea123456789]

ho fatto cosi,ma non invia email:

$user_id = array();
 $sSQL = "SELECT id FROM ".PREFIX."users";
 $result = mysql_query($sSQL);
 while($row= mysql_fetch_row($result)) 
{  
$user_id[] = $row['id'];
 } 
for($i= 0; $i < sizeof($user_id); $i++) 
{ 
 $sSQL = "SELECT p.id,p.owner,p.orderID,p.title,p.dateadded,u.email,u.firstname,u.lastname FROM ".PREFIX."listings AS p INNER JOIN ".PREFIX."users AS u ON p.owner=u.id AND display='Y' WHERE u.id=" . $user_id[$i];
 $result=$db->query($sSQL); 
$rs=$result->fetch(); 
$id=$rs['id'];
$to=$rs['email'];
$vars['title']=$title;
$vars['firstname']=$rs['firstname'];
$vars['lastname']=$rs['lastname'];
$content="tuoreport_report.tpl";
$msg=$Mailer->sendMail($to, $content,$vars); 

che ne dici?? grazie