How to configure postfix to only accept TLS connections on port 587?

Solution Unverified - Updated -

Issue

  • How to configure postfix to only accept TLS connections on port 587?
  • How to allow postfix to receive unencrypted mail on port 25?

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9
  • postfix

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