Filtering mails in kmail with a certain size

[Werner Schalk <werner_schalk@xxxxxx>]

Hi,

I am not quite sure whether this is really the appropriate mailing list but I 
will post anyway. I receive many emails that actually do not contain any text 
in the body which means they are meant to trick spam filters. How can I get 
rid of these emails using kmail? I have tried to set up a filter (size in 
bytes is less or equal to 1800) but that did not work. Any hints?

Thank you very much.

Bye,
Werner.
  
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