邮件跟踪问题，谢谢。
我给网站注册用户发送产品邮件。
发送的邮件里面就是一些产品的信息，邮件模版如下：
>
>
我想知道用户是否查看了邮件，请问要怎样跟踪呢。
我用如下方法，测试后不通过：
例一：
例二：
测试后发现在邮件中打开邮件后这个地址没有被访问过。
注：在邮件中图片是可以显示的（
）。
------解决方案--------------------
注册用户要是访问了，你不就能获取到信息了吗，你还想要怎样跟踪。
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