Procmail recipe help!

Hi!

I'm looking for help in a recipe for procmail:
  send the mail to another address and keep a copy in /var/spool/mail/xxx

I'm not familiar with procmail syntax, and i'm trying to find out a good
faq or howto...
10x!

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Catarina Vieira Simoes
c41366(_at_)alfa(_dot_)ist(_dot_)utl(_dot_)pt