no subject

I study the procmailex manual and I don't find any exemple with null Subject
I want to forward to teste mailbox(in my own domain) all e-mails without 
subject.
Tahnks

> ³³°°°°³³°°°°³³ªªªª°°§§³²¹¹²³§§°°°°°°ªªªª°³³°°°°³³°°°°³³<
>       João Paulo G. de Andrade                  <
>       joaopaulo(_at_)unimetro(_dot_)com(_dot_)br                 <
>       Setor de Informática                      <
>       Unimed Metropolitana de Salvador         <
> ³³°°°°³³°°°°³³ªªªª°°§§³²¹¹²³§§°°°°°°ªªªª°³³°°°°³³°°°°³³ <


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