How to disable reverse DNS lookups for incoming connections in postfix.

Solution Unverified - Updated -

Issue

  • How to disable reverse DNS lookup for incoming connections in postfix.
  • How to disable the reverse DNS lookup so that is always 'unknown' in maillog and mail header.

Environment

  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • postfix 2.3 later

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