Why an empty address @example.com would be rewritten to MAILER-DAEMON@example.com ?

Solution Unverified - Updated -

Issue

  • Why an empty address @example.com would be rewritten to MAILER-DAEMON@example.com ?
1233421D67: to=<MAILER-DAEMON@example.com>, orig_to=<@example.com>, relay=foo.bar.example.com[192.168.0.25]:25, delay=5.6, delays=1.1/0/4.5/0, dsn=2.0.0, status=sent (250 Message accepted for delivery)

Environment

  • Red Hat Enterprise Linux
  • postfix

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