BOUNCE(5)                                                            BOUNCE(5)

NAME
       bounce - Postfix bounce message template format

SYNOPSIS
       bounce_template_file = /etc/postfix/bounce.cf

       postconf -b [template_file]

DESCRIPTION
       The  Postfix  bounce(8)  server  produces  delivery status notification
       (DSN) messages for undeliverable mail, delayed mail, successful  deliv-
       ery 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_tem-
       plate_file configuration parameter.

       This document describes the general procedure to create a  bounce  tem-
       plate  file,  followed  by the specific details of bounce template for-
       mats.

GENERAL PROCEDURE
       To create a customized bounce template file, create a temporary copy of
       the file /etc/postfix/bounce.cf.default 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 con-
       figuration directory and specify in main.cf something like:

       /etc/postfix/main.cf:
           bounce_template_file = /etc/postfix/bounce.cf

TEMPLATE FILE FORMAT
       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   ver-
       ify_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  (tem-
       plate_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
           EOF

       The  usage and specification of bounce templates is subject to the fol-
       lowing restrictions:

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

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

       o      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 bounce.cf.default in
       the Postfix configuration directory.

TEMPLATE HEADER FORMAT
       The first portion of a bounce template consists  of  optional  template
       headers.   Some become message headers in the delivery status notifica-
       tion; 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:

       Charset:
              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
              notification.

       Subject:
              The subject in the message header of the delivery status notifi-
              cation that is returned to the sender.

       Postmaster-Subject:
              The subject that will be used in Postmaster copies of undeliver-
              able  or delayed mail notifications. These copies are sent under
              control of the notify_classes configuration parameter.

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

       o      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:".

       o      Template message headers must not span multiple lines.

       o      Template message headers do not support $parameter expansions.

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

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

       delay_warning_time_suffix
              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.

       maximal_queue_lifetime_suffix
              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.

       mydomain
              Expands into the value of the mydomain  parameter.   With  "smt-
              putf8_enable  = yes", this replaces ACE labels (xn--mumble) with
              their UTF-8 equivalent.

              This feature is available in Postfix 2.12.

       myhostname
              Expands into the value of the myhostname parameter.  With  "smt-
              putf8_enable  = yes", this replaces ACE labels (xn--mumble) with
              their UTF-8 equivalent.

              This feature is available in Postfix 2.12.

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

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

       o      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 tem-
              plate when it sends a delivery status notification.

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

LICENSE
       The Secure Mailer license must be distributed with this software.

HISTORY
       The Postfix bounce template format was originally developed by  Nicolas
       Riendeau.

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

                                                                     BOUNCE(5)