分析hotmail中标记为垃圾邮件的邮件的电子邮件头

我有一个简单的PHP脚本，它可以为我的网站上的用户生成一封电子邮件。出于某种原因，大多数邮件都被发送到用户的垃圾邮件文件夹中。我建立了一个hotmail帐户来测试这一点，现在我正试图分析邮件头，以检查它为什么会被添加到垃圾邮件文件夹中。

我得到的标题包含在下面。似乎没有任何与垃圾邮件有关的信息（即垃圾邮件杀手）。我想知道是否有人能发现问题所在？

x-store-info:4r51+eLowCe79NzwdU2kRyU+pBy2R9QCj0/8P6fDMVumMo6iGJG5XQGQsGw4y+KC5jGdX6A7+/ZVHRw3c8psWXtc+cAfssqe5kw3LdG9RbC+kh049fg5aL5vFishJNonRedbn/JCR2Y=
Authentication-Results: hotmail.com; sender-id=pass (sender IP is 208.53.158.38) header.from=info@****.com; dkim=pass header.d=****.com; x-hmca=pass
X-SID-PRA: info@****.com
X-Message-Status: n:0:n
X-SID-Result: Pass
X-DKIM-Result: Pass
X-AUTH-Result: PASS
X-Message-Delivery: Vj0xLjE7dXM9MDtsPTA7YT0wO0Q9MjtHRD0yO1NDTD02
X-Message-Info: M98loaK0Lo1tWPCbe4OE0UbDdVDXEICZZMNsQz6Wthy3jeg8lyZ+D9euQ2riH1WvmBV23btdBFelBmKMH/9LOMR9or7uhXgxLWPa0gAZnJxsZCwy+xyGPBu8cHXLoyzG0CR/fKSJcN+zLjJCNkZvew==
Received: from itchy.cirtexhosting.com ([208.53.158.38]) by COL0-MC2-F40.Col0.hotmail.com with Microsoft SMTPSVC(6.0.3790.4900);
     Sun, 22 Jul 2012 16:56:31 -0700
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=****.com; s=default;
    h=Subject:To:From; bh=ZwVnoaT/AbcAu6/7wnV5p3ZMSyLI5Eg9h9kKTJTmUL4=;
    b=LTP74QdOU6Yt71wIr+J3PKWQUnGLUKRyU/Ps+ZM+OPgGOwfAeAvbPVemSl+dEh2u0VYtiuCdl5WvSK5zzQh+OV4KiBcy0xNj1vaRnBuUORgBY+SEIXu5TgLf3CbEZY0u;
Received: from itchy.cirtexhosting.com ([208.53.158.38]:26249 helo=localhost)
    by itchy.cirtexhosting.com with esmtpsa (TLSv1:AES256-SHA:256)
    (Exim 4.77)
    (envelope-from <info@****.com>)
    id 1St60G-0000kF-Oq
    for ****@hotmail.com; Sun, 22 Jul 2012 19:56:01 -0400
From: Marvelous Monthly Mix Up <info@****.com>
To: ****@hotmail.com
Subject: Welcome to the Marvelous Monthly Mix Up
X-AntiAbuse: This header was added to track abuse, please include it with any abuse report
X-AntiAbuse: Primary Hostname - itchy.cirtexhosting.com
X-AntiAbuse: Original Domain - hotmail.com
X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12]
X-AntiAbuse: Sender Address Domain - ****.com
X-Source: 
X-Source-Args: 
X-Source-Dir: 
Return-Path: info@****.com
Message-ID: <COL0-MC2-F40nkB4ltF00b5209d@COL0-MC2-F40.Col0.hotmail.com>
X-OriginalArrivalTime: 22 Jul 2012 23:56:31.0807 (UTC) FILETIME=[9E28C4F0:01CD6865]