How can I keep mail to user "root" to just local delivery only? (FC3)

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Subject: How can I keep mail to user "root" to just local delivery only? (FC3)
From: test <test@xxxxxxxxxxxxxx>
Date: Tue, 17 May 2005 08:58:53 -0500
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Lots of spam going to root!

FC3-sendmail-MailScanner-Spamassasin-ClamAV

thanks

Follow-Ups:
- Re: How can I keep mail to user "root" to just local delivery only? (FC3)
  - From: Alexander Dalloz