Use :0c
para encaminhar uma cópia de uma mensagem
:0c
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documentação da sinalização c:
c Generate a carbon copy of this mail. This only makes sense on delivering recipes. The only
non-delivering recipe this flag has an effect on is on a nesting block, in order to generate a
carbon copy this will clone the running procmail process (lockfiles will not be inherited),
whereby the clone will proceed as usual and the parent will jump across the block.