[Users] Filter->Condition: test for missing Date header?

[Pierre Fortin]

Hi,

Does anyone have a Filter Condition to test for a missing Date header?

Asian spammers have tendency to send messages without a Date header which
makes these messages appear as the oldest date and requiring scrolling to
the other end of the message list to access/delete them.

Just wanting to trash any messages not containing a Date header.

Thanks,
Pierre