How to configure Postfix for relaying mail with authentication.

Solution Verified - Updated -

Issue

  • My system cannot send mail directly to other domains.
  • Need to configure Postfix to send emails via my ISP relay mail host.

Environment

  • Red Hat Enterprise Linux (RHEL) 6
  • Red Hat Enterprise Linux (RHEL) 7
  • Red Hat Enterprise Linux (RHEL) 8
  • Red Hat Enterprise Linux (RHEL) 9
  • postfix

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