مشكل در ارسال ايميل فارسي

[bps20590]

با سلام
من بوسيله كد زير مي خواهم ارسال ايميل داشته باشم اينكار هم انجام ميشه اما نمي دونم چرا موضوع ايميل بصورت حروف ناخوانا هستند


$message =
"You have registered new user details from $host. Here are the login details...\n\n <br>
____________________________________________ <br>
User Name: $v1 \n <br>
Password: $v2 \n <br>
_____________________________________________ <br>
*** LOGIN ***** \n
To Login: http://$host/login.php \n\n <br>
Thank you. This is an automated response. PLEASE DO NOT REPLY.
";
require("class.phpmailer.php");
$mail = new PHPMailer();
$mail->IsSMTP(); // send via SMTP
$mail->Host = "mail.tak.com"; // SMTP server
$mail->SMTPAuth = true; // turn on SMTP authentication
$mail->Username = "info@tak.com"; // SMTP username
$mail->Password = "pishbinicon"; // SMTP password
$mail->From = "info@tak.com";
$mail->FromName = "pishbinicon!";
$mail->AddAddress($v4,"");
$mail->AddReplyTo("info@pishbinicon.com","");
$mail->WordWrap = 50; // set word wrap
$mail->AddAttachment("Path to Attachment "); // attachment
$mail->IsHTML(true); // send as HTML
$mail->Subject ="به سايت ما خوش آمديدي";
$mail->Body = $message;
$mail->AltBody = "This is the text-only body";
if(!$mail->Send())
{
echo "Message was not sent <p>";
echo "Mailer Error: " . $mail->ErrorInfo;
exit;
}
echo 'عضويت شما با موفقيت انجام شد براي ورود به سايت '.'&nbsp;<a href="login.php" target="_self" style="color:#FFFFFF"><b>اينجـا</b></a>&nbsp;'.'كليك كنيد';
}
else
{
echo 'اخطار؟'.'<br>';
echo $mes;
}

[bps20590]

كلاس رو گذاشتم
ضمناً منظور شما رو متوجه نمي شم