Emmett Culley via Postfix-users:
> We have a web app we use to find bad email addresses after a
> newsletter goes out.  We read the mail queue using postqueue -p,
> the parse the output of that command to get a list of emails that
> failed to successfully send.

That will only give you *SOME* of the failed addresses.

To get information about ALL delivery attempts, you MUST process
the MAIL LOG FILE.

    https://www.postfix.org/DEBUG_README.html#logging

The output of the postqueue command:

- Does not show the recipients that have an invalid address (user
  unknown) or that are over quota, etc. Those failed recipients are
  NOT kept in the queue.

- Does not show a 'reason' for a failing recipient while Postfix is
  busy trying to deliver the message to that recipient.

You really should look in the log.

        Wietse
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