"Failed to start Postfix Mail Transport Agent" was outputted during boot process

Solution Unverified - Updated -

Issue

  • The following messages are outputted during boot process.
May 24 16:56:15 R75 systemd: Failed to start Postfix Mail Transport Agent.
May 24 16:56:15 R75 systemd: Unit postfix.service entered failed state.
May 24 16:56:15 R75 systemd: postfix.service failed.
  • What's the meaning of these messages?
  • Is it harmful to my system?

Environment

  • Red Hat Enterprise Linux 7

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