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From: Peter Santiago (peter.santiago_at_psinergybbs.com)
Date: Sat Nov 02 2002 - 18:28:11 CST

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    In short, look on the maillog.... =^^=

    -----Original Message-----
    From: owner-postfix-userspostfix.org
    [mailto:owner-postfix-userspostfix.org]On Behalf Of Wietse Venema
    Sent: Saturday, November 02, 2002 10:09 AM
    To: Amit Jhawar
    Cc: postfix-userspostfix.org
    Subject: Re: reasons for bounce messages

    Amit Jhawar:
    > Hi,
    >
    > I'm looking for all the reasons for which postfix will bounce a message
    > back...can somebody shed some light on it or give me some pointers?
    >
    > thanks in advance

    Postfix sends an "Undelivered Mail Returned to Sender" message when
    Postfix has taken responsibility for delivering the mail, but is
    unable to deliver the message.

    - The recipient is local but does not exist.

    - The recipient is local, but Postfix is unable to find out if the
      recipient exists. There are 100 million reasons why this can
      fail. Postfix logs the reason for failure in the maillog file.

    - The recipient is local, the recipient exists, but the mail cannot
      be delivered. There are 100 million reasons why this can fail.
      Postfix logs the reason for failure in the maillog file.

    - The recipient is remote, but the remote destination does not
      exist.

    - The recipient is remote, but Postfix is unable to find out if
      the remote destination exists. There are 100 million reasons why
      this can fail. Postfix logs the reason for failure in the maillog
      file.

    - The recipient is remote, the remote destination exists, but the
      mail cannot be delivered. There are 100 million reasons why this
      can fail. Postfix logs the reason for failure in the maillog
      file.

    - Someone messed up the system so that Postfix cannot deliver mail.
      There are 100 million ways in which the system can be messed up.
      Postfix logs the reason for failure in the maillog file.

            Wietse
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