PHPMailer - Hvordan får jeg det til at virke?

PHP kode 

 <form name=\"form1\" method=\"post\" action=\"send_contact.php\">
 <p>Emne:</p><input name=\"subject\" class=\"input\" type=\"text\" id=\"subject\" size=\"64\"><br /><br />
 <p>Forespørgsel:</p><textarea name=\"detail\" cols=\"50\" rows=\"7\" id=\"detail\"></textarea><br /><br />
 <p>Navn:</p><input name=\"name\" class=\"input\" type=\"text\" id=\"name\" size=\"64\"><br /><br />
 <p>Email:</p><input name=\"customer_mail\" class=\"input\" type=\"text\" id=\"customer_mail\" size=\"64\"><br /><br />
 <input type=\"submit\" name=\"Submit\" value=\"&nbsp;Send&nbsp;\"> <input type=\"reset\" name=\"Submit2\" value=\"&nbsp;Ryd formen&nbsp;\">

PHP kode 

 <?php
 
 require_once("includes/phpmailer/class.phpmailer.inc.php");
 require_once("includes/phpmailer/class.smtp.inc.php");
 
 // Contact subject
 $subject = $_POST['subject']; 
 // Details
 $message = $_POST['detail']; 
 
 // Mail of sender
 $mail_from = $_POST['customer_mail'];
 // From 
 $header = "from: $mail_from";
 
 // Enter your email address
 $to ='Modtager@mail.com';
 
 // Dette vil køre med SMTP
 $mail = new PHPMailer();
 $mail ->IsSMTP();
 $mail ->HOST = "localhost";
 $mail ->Port = 25;
 $mail ->SMTPAuth = false;
 $mail ->Username = "Er dette den email der skal modtage mails";
 $mail ->Passsword = "Er dette mit private password til min private email konto";
 
 $mail ->Emailfrom = $email_from;
 $mail ->AddAddress($to);
 $mail ->Body = $message;
 $mail ->Subject = $subject;
 
 $send_contact = $mail->Send();
 
 if($send_contact){
 echo "Tak for din forespørgsel.";
 }
 else {
 echo "ERROR";
 }
 ?>