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    Command:

    pipe

    
    
    

    SYNOPSIS

           pipe [generic Postfix daemon options] command_attributes...
    
    
    

    DESCRIPTION

           The pipe(8) daemon processes requests from the Postfix queue manager to
           deliver messages to external commands.  This program expects to be  run
           from the master(8) process manager.
    
           Message  attributes such as sender address, recipient address and next-
           hop host name can be specified as command-line macros that are expanded
           before the external command is executed.
    
           The  pipe(8)  daemon  updates  queue files and marks recipients as fin-
           ished, or it informs the queue manager that delivery  should  be  tried
           again  at  a  later  time.  Delivery  status  reports  are  sent to the
           bounce(8), defer(8) or trace(8) daemon as appropriate.
    
    
    

    SINGLE-RECIPIENT DELIVERY

           Some destinations cannot handle more than one  recipient  per  delivery
           request.  Examples  are  pagers  or  fax machines.  In addition, multi-
           recipient delivery is undesirable when prepending a Delivered-to: or X-
           Original-To: message header.
    
           To  prevent  Postfix  from  sending  multiple  recipients  per delivery
           request, specify
    
               transport_destination_recipient_limit = 1
    
           in the Postfix main.cf file, where transport is the name in  the  first
           column  of  the  Postfix  master.cf  entry  for the pipe-based delivery
           transport.
    
    
    

    COMMAND ATTRIBUTE SYNTAX

           The external command attributes are given in the master.cf file at  the
           end of a service definition.  The syntax is as follows:
    
           chroot=pathname (optional)
                  Change  the  process root directory and working directory to the
                  named directory. This happens before switching to the privileges
                  specified  with  the  user  attribute,  and before executing the
                  optional directory=pathname directive. Delivery is  deferred  in
                  case of failure.
    
                  This feature is available as of Postfix 2.3.
    
           directory=pathname (optional)
                  Change to the named directory before executing the external com-
                  mand.  The directory must be accessible for the  user  specified
                  with the user attribute (see below).  The default working direc-
                  tory is $queue_directory.  Delivery is deferred in case of fail-
                  ure.
    
                         lines only when preceded by a blank line.
    
                  D      Prepend  a  "Delivered-To: recipient" message header with
                         the envelope recipient address. Note: for this  to  work,
                         the  transport_destination_recipient_limit must be 1 (see
                         SINGLE-RECIPIENT DELIVERY above for details).
    
                         The D flag also enforces loop detection (Postfix 2.5  and
                         later):  if  a  message  already contains a Delivered-To:
                         header with the same recipient address, then the  message
                         is  returned  as undeliverable. The address comparison is
                         case insensitive.
    
                         This feature is available as of Postfix 2.0.
    
                  F      Prepend a "From sender time_stamp" envelope header to the
                         message  content.  This is expected by, for example, UUCP
                         software.
    
                  O      Prepend an "X-Original-To: recipient" message header with
                         the recipient address as given to Postfix. Note: for this
                         to work, the  transport_destination_recipient_limit  must
                         be 1 (see SINGLE-RECIPIENT DELIVERY above for details).
    
                         This feature is available as of Postfix 2.0.
    
                  R      Prepend  a  Return-Path: message header with the envelope
                         sender address.
    
                  X      Indicate that the external command performs final  deliv-
                         ery.   This flag affects the status reported in "success"
                         DSN (delivery status notification) messages, and  changes
                         it from "relayed" into "delivered".
    
                         This feature is available as of Postfix 2.5.
    
                  h      Fold  the command-line $original_recipient and $recipient
                         address domain part (text to the right of the  right-most
                         @  character) to lower case; fold the entire command-line
                         $domain and $nexthop host or domain information to  lower
                         case.  This is recommended for delivery via UUCP.
    
                  q      Quote  white  space  and  other special characters in the
                         command-line $sender, $original_recipient and  $recipient
                         address  localparts (text to the left of the right-most @
                         character), according to an 8-bit transparent version  of
                         RFC  822.   This  is recommended for delivery via UUCP or
                         BSMTP.
    
                         The result is compatible with the address parsing of com-
                         mand-line recipients by the Postfix sendmail(1) mail sub-
                         mission command.
                         expected by, for example, UUCP software.
    
           null_sender=replacement (default: MAILER-DAEMON)
                  Replace  the  null  sender  address (typically used for delivery
                  status notifications) with the specified text when expanding the
                  $sender  command-line  macro,  and  when  generating  a From_ or
                  Return-Path: message header.
    
                  If the null sender replacement text is a non-empty  string  then
                  it is affected by the q flag for address quoting in command-line
                  arguments.
    
                  The null sender replacement text may be empty; this form is rec-
                  ommended  for  content filters that feed mail back into Postfix.
                  The empty sender address is not  affected  by  the  q  flag  for
                  address quoting in command-line arguments.
    
                  Caution:  a  null  sender  address is easily mis-parsed by naive
                  software. For example, when the pipe(8) daemon executes  a  com-
                  mand such as:
    
                      Wrong: command -f$sender -- $recipient
    
                  the  command  will mis-parse the -f option value when the sender
                  address is a null string.  For correct parsing, specify  $sender
                  as an argument by itself:
    
                      Right: command -f $sender -- $recipient
    
                  This feature is available as of Postfix 2.3.
    
           size=size_limit (optional)
                  Don't  deliver  messages that exceed this size limit (in bytes);
                  return them to the sender instead.
    
           user=username (required)
    
           user=username:groupname
                  Execute the external command with the rights  of  the  specified
                  username.   The  software  refuses to execute commands with root
                  privileges, or with the privileges of the mail system owner.  If
                  groupname  is  specified,  the  corresponding  group  ID is used
                  instead of the group ID of username.
    
           argv=command... (required)
                  The command to be executed. This must be specified as  the  last
                  command attribute.  The command is executed directly, i.e. with-
                  out interpretation of shell meta characters by a  shell  command
                  interpreter.
    
                  In  the command argument vector, the following macros are recog-
                  nized and replaced with corresponding information from the Post-
                         This feature is available as of Postfix 2.2.
    
                  ${client_hostname}
                         This macro expands to the remote client hostname.
    
                         This feature is available as of Postfix 2.2.
    
                  ${client_port}
                         This macro expands to the remote client TCP port  number.
    
                         This feature is available as of Postfix 2.5.
    
                  ${client_protocol}
                         This macro expands to the remote client protocol.
    
                         This feature is available as of Postfix 2.2.
    
                  ${domain}
                         This macro expands to the domain portion of the recipient
                         address.  For example, with  an  address  user+foo@domain
                         the domain is domain.
    
                         This information is modified by the h flag for case fold-
                         ing.
    
                         This feature is available as of Postfix 2.5.
    
                  ${extension}
                         This macro expands to the extension part of  a  recipient
                         address.   For  example,  with an address user+foo@domain
                         the extension is foo.
    
                         A  command-line  argument  that   contains   ${extension}
                         expands  into as many command-line arguments as there are
                         recipients.
    
                         This information is modified by the u flag for case fold-
                         ing.
    
                  ${mailbox}
                         This macro expands to the complete local part of a recip-
                         ient   address.    For   example,   with    an    address
                         user+foo@domain the mailbox is user+foo.
    
                         A  command-line argument that contains ${mailbox} expands
                         to as many command-line arguments as  there  are  recipi-
                         ents.
    
                         This information is modified by the u flag for case fold-
                         ing.
    
                  ${nexthop}
                         and case folding.
    
                         This feature is available as of Postfix 2.5.
    
                  ${recipient}
                         This macro expands to the complete recipient address.
    
                         A   command-line   argument  that  contains  ${recipient}
                         expands to as many command-line arguments  as  there  are
                         recipients.
    
                         This information is modified by the hqu flags for quoting
                         and case folding.
    
                  ${sasl_method}
                         This macro expands to the name of the SASL authentication
                         mechanism  in  the  AUTH  command  when  the Postfix SMTP
                         server received the message.
    
                         This feature is available as of Postfix 2.2.
    
                  ${sasl_sender}
                         This macro expands to the  SASL  sender  name  (i.e.  the
                         original submitter as per RFC 4954) in the MAIL FROM com-
                         mand when the Postfix SMTP server received the message.
    
                         This feature is available as of Postfix 2.2.
    
                  ${sasl_username}
                         This macro expands to the SASL user name in the AUTH com-
                         mand when the Postfix SMTP server received the message.
    
                         This feature is available as of Postfix 2.2.
    
                  ${sender}
                         This  macro  expands  to  the envelope sender address. By
                         default, the null sender address expands  to  MAILER-DAE-
                         MON;  this can be changed with the null_sender attribute,
                         as described above.
    
                         This information is modified by the q flag for quoting.
    
                  ${size}
                         This macro expands to Postfix's idea of the message size,
                         which  is  an approximation of the size of the message as
                         delivered.
    
                  ${user}
                         This macro expands to the username part  of  a  recipient
                         address.   For  example,  with an address user+foo@domain
                         the username part is user.
    
    
           Postfix  version  2.3  and later support RFC 3463-style enhanced status
           codes.  If a command terminates with a non-zero exit  status,  and  the
           command  output  begins  with an enhanced status code, this status code
           takes precedence over the non-zero exit status.
    
           Problems and transactions are logged to syslogd(8).  Corrupted  message
           files are marked so that the queue manager can move them to the corrupt
           queue for further inspection.
    
    
    

    SECURITY

           This program needs a dual personality 1) to access the private  Postfix
           queue  and  IPC  mechanisms, and 2) to execute external commands as the
           specified user. It is therefore security sensitive.
    
    
    

    CONFIGURATION PARAMETERS

           Changes to main.cf are picked up automatically as pipe(8) processes run
           for  only a limited amount of time. Use the command "postfix reload" to
           speed up a change.
    
           The text below provides only a parameter summary. See  postconf(5)  for
           more details including examples.
    
    
    

    RESOURCE AND RATE CONTROLS

           In the text below, transport is the first field in a master.cf entry.
    
           transport_destination_concurrency_limit   ($default_destination_concur-
           rency_limit)
                  Limit the number of parallel deliveries to the same destination,
                  for delivery via the named transport.  The limit is enforced  by
                  the Postfix queue manager.
    
           transport_destination_recipient_limit     ($default_destination_recipi-
           ent_limit)
                  Limit  the number of recipients per message delivery, for deliv-
                  ery via the named transport.  The limit is enforced by the Post-
                  fix queue manager.
    
           transport_time_limit ($command_time_limit)
                  Limit  the  time  for delivery to external command, for delivery
                  via the named transport.  The limit  is  enforced  by  the  pipe
                  delivery agent.
    
                  Postfix  2.4  and later support a suffix that specifies the time
                  unit: s (seconds), m (minutes), h (hours), d (days), w  (weeks).
                  The default time unit is seconds.
    
    
    

    MISCELLANEOUS CONTROLS

           config_directory (see 'postconf -d' output)
                  The  default  location of the Postfix main.cf and master.cf con-
                  figuration files.
    
                  internal communication channel.
    
           mail_owner (postfix)
                  The UNIX system account that owns the  Postfix  queue  and  most
                  Postfix daemon processes.
    
           max_idle (100s)
                  The  maximum  amount of time that an idle Postfix daemon process
                  waits for an incoming connection before terminating voluntarily.
    
           max_use (100)
                  The maximal number of incoming connections that a Postfix daemon
                  process will service before terminating voluntarily.
    
           process_id (read-only)
                  The process ID of a Postfix command or daemon process.
    
           process_name (read-only)
                  The process name of a Postfix command or daemon process.
    
           queue_directory (see 'postconf -d' output)
                  The location of the Postfix top-level queue directory.
    
           recipient_delimiter (empty)
                  The  separator  between  user  names  and   address   extensions
                  (user+foo).
    
           syslog_facility (mail)
                  The syslog facility of Postfix logging.
    
           syslog_name (see 'postconf -d' output)
                  The  mail  system  name that is prepended to the process name in
                  syslog records, so that "smtpd"  becomes,  for  example,  "post-
                  fix/smtpd".
    
    
    

    SEE ALSO

           qmgr(8), queue manager
           bounce(8), delivery status reports
           postconf(5), configuration parameters
           master(5), generic daemon options
           master(8), process manager
           syslogd(8), system logging
    
    
    

    LICENSE

           The Secure Mailer license must be distributed with this software.
    
    
    

    AUTHOR(S)

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