我在电子邮件中发送mySQL信息有问题

我想发送一封带有用户的电子邮件和密码的电子邮件到他们的电子邮件帐户。这是我的代码:

    if ($ct2 == 1){
        while ($row = mysql_fetch_array($sql)){
            $emusername = $row2["username"];
            $empassword = $row2["password"];
            $firstname = $row2["first_name"];
            $to = $row["email"];
            $subject = "User Name And Password";
            $message =  $firstname 
                . "Here is your username and password,'n Username" 
                . $emusername . "'n Password" 
                . $empassword . "'n'n";
            $headers = "From: webmaster@tfcbondfire.com'r'nReply-To: Forgot username and password.";
            mail($to,$subject,$message,$headers);

//邮件发送了，但是$…发送$消息中的信息。我不知道怎么让它发送信息。