Outlook Outlook-marking emails Unread/read feature

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Jun 11, 2009
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Hello,

Is it possible to set a security feature on an email so that the receiver can not mark the message as unread once the message was opened. I had this happen to me with several emails from another outlook user. We work on the same server.

Once I opened the emails, I was not able to close them and mark as unread. Within an hour the property was removed. I trying to figure out how this happened. Thanks in advance for any insight.
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