i have

    acl_check_rcpt:
      accept  hosts         = +relay_from_hosts
      accept  hosts         = +acception
      require verify        = recipient
      ...

i suspect this is not configured to do as i expect.  i am hoping to
respond to the sender with a 5xx if the user is not known so that a
sending postfix, configured with

    reject_unverified_recipient

will know to drop as opposed to forwarding to me, cf.
https://www.postfix.org/ADDRESS_VERIFICATION_README.html
ยง Recipient address verification

clue bat please

randy

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