webserver – Php Mail转发收件人垃圾邮件/垃圾文件夹

为了解决它：

我尝试了stackoverflow和serverfault网站中类似问题的所有步骤和答案.
*正确的标题
*准确姓名等
但问题尚未解决.

这是用于发送电子邮件的PHP代码：

<?php
$from_address="webmaster@".$_SERVER['SERVER_NAME'];
$from_name="webmaster";
$headers = "MIME-Version: 1.0rn"
  ."Content-Type: text/plain; charset=utf-8rn"
  ."Content-Transfer-Encoding: 8bitrn"
  ."From: =?UTF-8?B?". base64_encode($from_name) ."?= <$from_address>rn"
  ."X-Mailer: PHP/". phpversion();
$subject="Web Mail Testing";
$body="This is test Message";
$to="riteshkumargupta1990@gmail.com";
mail($to,$subject,$body,$headers,"-fwebmaster@{$_SERVER['SERVER_NAME']}");
echo "The Mail is  SuccessFully Sent to :".$to;
?>

我还附上原始电子邮件(我在我的Gmail帐户中收到的“riteshkumargupta1990@gmail.com”)

Delivered-To: riteshkumargupta1990@gmail.com
Received: by 10.204.8.210 with SMTP id i18csp146000bki;
        Wed,21 Nov 2012 20:58:12 -0800 (PST)
Received: by 10.68.219.164 with SMTP id pp4mr1119127pbc.72.1353560291776;
        Wed,21 Nov 2012 20:58:11 -0800 (PST)
Return-Path: <webmaster@nitw.ac.in>
Received: from www.nitw.ac.in (www.nitw.ac.in. [218.248.13.200])
        by mx.google.com with ESMTPS id sh10si3456960pbb.293.2012.11.21.20.58.10
        (version=TLSv1/SSLv3 cipher=OTHER);
        Wed,21 Nov 2012 20:58:11 -0800 (PST)
Received-SPF: pass (google.com: best guess record for domain of webmaster@nitw.ac.in designates 218.248.13.200 as permitted sender) client-ip=218.248.13.200;
Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of webmaster@nitw.ac.in designates 218.248.13.200 as permitted sender) smtp.mail=webmaster@nitw.ac.in
Received: from www.nitw.ac.in (localhost.localdomain [127.0.0.1])
    by www.nitw.ac.in (8.13.8/8.13.8) with ESMTP id qAM50M0h016190
    for <riteshkumargupta1990@gmail.com>; Thu,22 Nov 2012 10:30:23 +0530
Received: (from nobody@localhost)
    by www.nitw.ac.in (8.13.8/8.13.8/Submit) id qAM50McG016189;
    Thu,22 Nov 2012 10:30:22 +0530
Date: Thu,22 Nov 2012 10:30:22 +0530
Message-Id: <201211220500.qAM50McG016189@www.nitw.ac.in>
X-Authentication-Warning: www.nitw.ac.in: nobody set sender to webmaster@nitw.ac.in using -f
To: riteshkumargupta1990@gmail.com
Subject: Web Mail Testing
X-PHP-Originating-Script: 0:mailer.php
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
From: =?UTF-8?B?d2VibWFzdGVy?= <webmaster@nitw.ac.in>
X-Mailer: PHP/5.3.5

This is test Message

此外,谷歌搜索时发现这种问题的不常见原因是服务器黑名单.

然后我使用以下工具来测试它：http://www.mxtoolbox.com/SuperTool.aspx?action=mx%3anitw.ac.in#

当上面的工具测试发现我的服务器在黑名单中时,我感到震惊.这是怎么回事？因为我上面附上的原始邮件说“：Received-SPF：pass(google.com：webmaster@nitw.ac.in域名的最佳猜测记录,指定218.248.13.200为允许的发件人)

此外,如果我的服务器被列入黑名单,那么我如何找到黑名单的原因以及如何解决它？

UPD：
来自影子评论：可以“X-Authentication-Warning：www.nitw.ac.in：nobody set sender to webmaster@nitw.ac.in using -f”msg是可能的原因吗？如果是,我该如何解决？

谢谢！