Is there a way to tell spam assassin to avoid any processing of local emails?

[Peter M. Abraham]

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Peter M. Abraham
Greetings:

Is there a way to tell Spam Assassin (SpamAssassin 3.1.7) to skip processing
emails sent from our network (public IP addresses are involved)?

I do have TrustedNeworks set up, but I don't know if there is another
variable that must also be set up.

Thank you.