How do I filter on sender = Unknown or date = Unknown?

David Goodenough <[email protected]>
Newsgroups gmane.comp.kde.users.pim
Organization Linkchoose Ltd
Message-ID <9563694.aAMpREBD5B@stargate> 
Some (usually trash) emails arrive and are marked as either of unknown date
or unknown sender.  But there seems to be no means to match these items in
the kmail filters.  Have I missed something or is this not possible?

David
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