How to configure postfix to relay only to a specific email address?

Solution Verified - Updated -

Issue

  • How to configure postfix in a way that clients in network 10.0.200.0/24 can only relay emails to user@example.com while clients in 10.0.223.0/24 can have unrestricted relaying?
  • How to screen outgoing mail with Postfix
  • How to allow mail to be sent to only specific domains using Postfix

Environment

  • Red Hat Enterprise Linux 5.7
  • postfix-2.3.3-2.3.el5_6

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