PHP格式的电子邮件

在输入<textarea>中，文本看起来不错，有3行

First Line 
John Smith
Ivan Normand

当我用php捕获输入并发送电子邮件时，文本如下所示当我用php捕获输入并发送电子邮件时，文本看起来像

First Line                    Bellman:'r'n                          'r'nJohn Smith'r'nIvan Normand

我用雷鸟接收电子邮件，我看到了这一团糟。它在网络邮件中正确显示。

$message = $_POST["message"];
$headers = "From: $from";
// boundary
$semi_rand = md5(time());
$mime_boundary = "==Multipart_Boundary_x{$semi_rand}x";
// headers for attachment
$headers .= "'nMIME-Version: 1.0'n" . "Content-Type: multipart/mixed;'n" . " boundary='"{$mime_boundary}'"";
// multipart boundary
$message = "This is a multi-part message in MIME format.'n'n" . "--{$mime_boundary}'n" . "Content-Type: text/plain; charset='"utf-8'"'n" . "Content-Transfer-Encoding: 7bit'n'n" . $message . "'n'n";
$message .= "--{$mime_boundary}'n";
// preparing attachments
for ($x = 0; $x < count($files); $x++) {
    $file = fopen($files[$x], "rb");
    $data = fread($file, filesize($files[$x]));
    fclose($file);
    $data = chunk_split(base64_encode($data));
    $message .= "Content-Type: {'"application/octet-stream'"};'n" . " name='"$files[$x]'"'n" .
        "Content-Disposition: attachment;'n" . " filename='"$names[$x]'"'n" .
        "Content-Transfer-Encoding: base64'n'n" . $data . "'n'n";
    if ($x == count($files) - 1) {
        $message .= "--{$mime_boundary}--'r'n";
    } else {
        $message .= "--{$mime_boundary}'n";
    }
}
// send
$ok = @mail($to, $subject, $message, $headers);