How to block incoming emails from Internet for a particular alias group using postfix?

Solution Verified - Updated -

Issue

  • /etc/aliases has following entry:
user:        test, test1, test2
  • How to configure postfix so that only internal users are able to send emails to alias group named "user" (user@example.com)?

Environment

  • Red Hat Enterprise Linux 6.0
  • postfix-2.6.6-2.2.el6_1

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