为什么我的自定义标头被覆盖

所以我找到了下面的函数来发送电子邮件。我在函数后面写了两行，以便根据命令行参数调用它。

function mail_file( $to, $subject, $messagehtml, $from, $fileatt, $replyto="" ) {
    // handles mime type for better receiving
    $ext = strrchr( $fileatt , '.');
    $ftype = "";
    if ($ext == ".doc") $ftype = "application/msword";
    if ($ext == ".jpg") $ftype = "image/jpeg";
    if ($ext == ".gif") $ftype = "image/gif";
    if ($ext == ".zip") $ftype = "application/zip";
    if ($ext == ".pdf") $ftype = "application/pdf";
    if ($ftype=="") $ftype = "application/octet-stream";
    // read file into $data var
    $file = fopen($fileatt, "rb");
    $data = fread($file,  filesize( $fileatt ) );
    fclose($file);
    // split the file into chunks for attaching
    $content = chunk_split(base64_encode($data));
    $uid = md5(uniqid(time()));
    // build the headers for attachment and html
    $h = "From: $from'r'n";
    if ($replyto) $h .= "Reply-To: ".$replyto."'r'n";
    $h .= "MIME-Version: 1.0'r'n";
    $h .= "Content-Type: multipart/mixed; boundary='"".$uid."'"'r'n'r'n";
    $h .= "This is a multi-part message in MIME format.'r'n";
    $h .= "--".$uid."'r'n";
    $h .= "Content-type:text/html; charset=iso-8859-1'r'n";
    $h .= "Content-Transfer-Encoding: 7bit'r'n'r'n";
    $h .= $messagehtml."'r'n'r'n";
    $h .= "--".$uid."'r'n";
    $h .= "Content-Type: ".$ftype."; name='"".basename($fileatt)."'"'r'n";
    $h .= "Content-Transfer-Encoding: base64'r'n";
    $h .= "Content-Disposition: attachment; filename='"".basename($fileatt)."'"'r'n'r'n";
    $h .= $content."'r'n'r'n";
    $h .= "--".$uid."--";
    // send mail
    return mail( $to, $subject, strip_tags($messagehtml), str_replace("'r'n","'n",$h) ) ;

}
$body = file_get_contents($argv[3]);
mail_file($argv[1], $argv[2], $body, $argv[4], $argv[5]);

因此，如果我在命令行调用上面的脚本并使用以下内容。。。

php sendmail.php demo@morningcatch.ph This' is' a' test Content.html bob@fake.org form.pdf

然后它发送邮件，附件被卡住了，主题是"这是一个测试"，正文中有Content.html的内容……唯一不起作用的是，它仍然显示电子邮件源于"root@mybox"而不是bob@fake.org

如果有区别的话，我会尝试通过笔记本电脑上的NAT连接从虚拟机发送邮件。这会引起问题吗？如果我能以某种方式弥补它会更好吗？（我从来没有设法开始工作…）接收器实际看到的标题如下

Return-Path: <root@mybox>
Received: from mybox (Hostlaptop.local [hostIP])
by morningcatch.ph (8.14.3/8.14.3/Debian-9.lubuntul)) with SMTP id blahblah
for <demo@morningcatch.ph>: Current date
Message-Id: Gibberish
From: "root" <root@mybox>
Date: Date received
To: demo@morningcatch.ph
Subject: This is a test
X-PHP-Originating-Script: 0:sendemail.php
MIME-Version: 1.0
Content-Type: multi-part/mixed; boundary="hash"

等等。我不认为这是邮件服务器的问题，因为我的老板写了一个python脚本，做了几乎相同的事情（尽管他无法让附件工作），它欺骗了发送电子邮件的地址。现在我想起来，这让我觉得它不是虚拟机，因为python脚本在我的盒子里也很好用。为什么我的php脚本不能做到这一点？有什么想法吗？