procmail rules

Hi,
        Where I can study the procmail rules?

Thanks

> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ <
>       João Paulo G. de Andrade                  <
>       joaopaulo(_at_)unimetro(_dot_)com(_dot_)br                 <
>       Setor de Informática                      <
>       Unimed Metropolitana de Salvador         <
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ <


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