Out-of-Office Reply Tells All

I checked my personal email account and found I had 3 out-of-office replies from people who obviously belonged to the same organization. However, I had never emailed any of them.

At first I thought they were some kind of a malware emails, but they were text only and contained no links. So I just left them in my email box and wondered about them every time I saw them. Then I figured it out.

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