How to configure postfix failover/fallback relay hosts?

Solution Verified - Updated -

Issue

  • How to configure postfix to work in a failover manner for two relay hosts?

Environment

  • Red Hat Enterprise Linux (RHEL) 5
  • Red Hat Enterprise Linux (RHEL) 6
  • Red Hat Enterprise Linux (RHEL) 7
  • postfix [2.3.x] onwards

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