Why can't I set the source email address in mailx using the "-f" flag?

Solution Verified - Updated -

Issue

  • Moved from RHEL 4 to RHEL 6 and now mailx -f does not work as expected.
  • I am executing the command below, but something is wrong:
# mailx -s '$SUBJECT' recipient@example.com -- -r sender@example.com

Environment

  • Red Hat Enterprise Linux (RHEL)
    • 4
    • 5
    • 6
    • 7

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