When Postfix delivers to an unknown user via Dovecot it gets status=deferred but I want a reject in SMTPD instead. How fix?

main.cf: mailbox_transport = dovecot:
master.cf:
dovecot unix - n n - - pipe
  flags=DRhu user=vmail:vmail argv=/usr/libexec/dovecot/deliver
  -e -f ${sender} -d ${recipient}

Running deliver by hand shows it exiting with status 75.

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Reference:

1. Postfix