Regra procmailrc

Hoje todas as mensagens internas e externas passam pela regra de spam.
Gostaria que todas as mensagens da rede interna pulassem a regra do spam para não gerar tráfego desnecessário.
Estou com dificuldade em montar esta regra.

# regra: vem de um ip interno 192.168.*
:0
* ^Received:.from.*192\.168\.

:0fw: spamassassin.lock
* < 65535
| spamc

:0e
EXITCODE==0

Obrigado

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lll

Alguem pode me ajudar ?