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       bounce - Postfix bounce message template format


       bounce_template_file = /etc/postfix/

       postconf -b [template_file]


       The  Postfix  bounce(8)  server  produces  delivery status notification
       (DSN)  messages  for  undeliverable  mail,  delayed  mail,   successful
       delivery or address verification requests.

       By  default,  these notifications are generated from built-in templates
       with message headers and message text. Sites can override the  built-in
       information   by   specifying   a   bounce   template   file  with  the
       bounce_template_file configuration parameter.

       This document describes  the  general  procedure  to  create  a  bounce
       template  file,  followed  by  the  specific details of bounce template


       To create a customized bounce template file, create a temporary copy of
       the file /etc/postfix/ and edit the temporary file.

       To  preview  the  results of $name expansions in the template text, use
       the command

           postconf -b temporary_file

       Errors in the template will be reported to the  standard  error  stream
       and to the syslog daemon.

       While  previewing  the text, be sure to pay particular attention to the
       expansion of time value parameters that  appear  in  the  delayed  mail
       notification text.

       Once  the  result  is  satisfactory,  copy  the template to the Postfix
       configuration directory and specify in something like:

           bounce_template_file = /etc/postfix/


       The template file can specify templates for failed mail, delayed  mail,
       successful  delivery  or for address verification.  These templates are
       named   failure_template,    delay_template,    success_template    and
       verify_template,  respectively.  You can but do not have to specify all
       four templates in a bounce template file.

       Each template starts with "template_name = <<EOF" and ends with a  line
       that contains the word "EOF" only. You can change the word EOF, but you
       can’t  enclose  it  in  quotes  as  with  the  shell   or   with   Perl
       (template_name = <<EOF’). Here is an example:

           # The failure template is used for undeliverable mail.

           failure_template = <<EOF
           Charset: us-ascii
           From: MAILER-DAEMON (Mail Delivery System)
           Subject: Undelivered Mail Returned to Sender
           Postmaster-Subject: Postmaster Copy: Undelivered Mail

           This is the mail system at host $myhostname.

           I’m sorry to have to inform you that your message could not
           be delivered to one or more recipients. It’s attached below.

           For further assistance, please send mail to postmaster.

           If you do so, please include this problem report. You can
           delete your own text from the attached returned message.

                              The mail system

       The  usage  and  specification  of  bounce  templates is subject to the
       following restrictions:

       ·      No special meaning is given to the  backslash  character  or  to
              leading whitespace; these are always taken literally.

       ·      Inside  the << context, the "$" character is special. To produce
              a "$" character as output, specify "$$".

       ·      Outside the << context, lines beginning with "#" are ignored, as
              are empty lines, and lines consisting of whitespace only.

       Examples of all templates can be found in the file in
       the Postfix configuration directory.


       The first portion of a bounce template consists  of  optional  template
       headers.    Some   become   message  headers  in  the  delivery  status
       notification; some control the formatting of that notification. Headers
       not specified in a template will be left at their default value.

       The following headers are supported:

              The  MIME  character  set of the template message text.  See the
              "TEMPLATE MESSAGE TEXT FORMAT" description below.

       From:  The sender address in the message header of the delivery  status

              The  subject  in  the  message  header  of  the  delivery status
              notification that is returned to the sender.

              The  subject  that  will  be  used  in  Postmaster   copies   of
              undeliverable  or  delayed  mail notifications. These copies are
              sent  under  control   of   the   notify_classes   configuration

       The  usage  and specification of template message headers is subject to
       the following restrictions:

       ·      Template message header names can be specified  in  upper  case,
              lower case or mixed case. Postfix always produces bounce message
              header labels of the form "From:" and "Subject:".

       ·      Template message headers must not span multiple lines.

       ·      Template message headers do not support $parameter expansions.

       ·      Template message headers must contain ASCII characters only, and
              must not contain ASCII null characters.


       The  second  portion  of a bounce template consists of message text. As
       the above example shows, template  message  text  may  contain
       $parameters.  Besides  the  parameters that are defined in, the
       following parameters are treated specially depending on the suffix that
       is appended to their name.

              Expands  into  the  value  of  the delay_warning_time parameter,
              expressed in the time unit specified by suffix, which is one  of
              seconds, minutes, hours, days, or weeks.

              Expands  into the value of the maximal_queue_lifetime parameter,
              expressed in the time unit specified by suffix.  See above under
              delay_warning_time for possible suffix values.

       The  usage and specification of template message text is subject to the
       following restrictions:

       ·      The template message text is not sent in  Postmaster  copies  of
              delivery status notifications.

       ·      If  the  template  message  text  contains non-ASCII characters,
              Postfix requires that the Charset: template header  is  updated.
              Specify  an  appropriate  superset  of  US-ASCII.  A superset is
              needed because Postfix appends  ASCII  text  after  the  message
              template when it sends a delivery status notification.


       bounce(8), Postfix delivery status notifications
       postconf(5), configuration parameters


       The Secure Mailer license must be distributed with this software.


       The  Postfix bounce template format was originally developed by Nicolas


       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA