Header, which makes KMail see a message "as read"?

Kārlis Repsons <[email protected]>
Newsgroups gmane.comp.kde.users.pim
Message-ID <[email protected]>
Hi,
is there any possible mail header, which makes KMail see a message "as read"? 
I mean, not to move message from "new" to "cur" or to add something to message 
file name, but just to the message content. And if exists such header, what is 
the KMail's reaction besides perceiving it as read? Thanks...

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