这是一些邮件阅读客户端正常的安全提示，不是因为这封email是群发邮件而引起，用同一个发送邮箱，即使直接去发送，也可能会出现这类提示的。邮件阅读客户端有很多，比较常用的如Hotmail、Gmail邮箱、网页版的QQ邮箱、网页版的网易邮箱（163、126等），而安装在客户端的，如Outlook Express、Foxmail Client、Windows Live Mail等。下面分析几个案例：上图
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