Email 为什么我的邮件发送PHPMALLD认为垃圾（头包括）？

我使用phpmailer发送电子邮件。phpmailer使用SMTP进行了完美的重新配置。我的域/ip未被列入黑名单。我的头球看起来还不错，但仍然在hotmail和垃圾邮件中出现 这是我的邮件头

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Date: Wed, 5 Nov 2014 03:24:01 +0400
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From: ITA <event@eoman-ita.com>
Reply-To: ITA <info@eoman-ita.com>
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Hi my frind. I wanw to say hi to you


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<p><img src="http://eoman-ita.com/smartevent/images/invet.jpg" /></p>

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这只会发生在Hotmail上还是Gmail和Yahoo上？你没有真正的控制权。垃圾邮件过滤器是完全任意的，即使你有SPF和DKIM，并且发送无害的内容，它也可以被归类为垃圾邮件。实际上，在无害的内容方面，你会被标记下来，因为你的邮件正文都是图像，没有文本-这是一个值得避免的典型垃圾邮件模式。Hotmail和谷歌就是这样。不是因为内容，而是因为我只尝试了相同结果的文本。我们是一家政府机构，通过使用phpmailer发送电子邮件的web应用程序发送邀请。从标题我已经张贴什么是错误的？作为一个信息，我目前在我的防火墙规则说，如果类型的X-Mailer标题包含PHPMailer 5.2.9，我完全阻止源IP。我们正在接收来自世界各地的各种类型和IP的垃圾邮件，其中很大一部分来自此类邮件。PHPMailer 5.2.9是否可能存在安全漏洞或错误的默认参数？