    CLEANUP(8)                                             CLEANUP(8)

    NAME
           cleanup - canonicalize and enqueue Postfix message

    SYNOPSIS
           cleanup [generic Postfix daemon options]

    DESCRIPTION
           The cleanup daemon processes inbound mail, inserts it into
           the incoming mail queue, and informs the queue manager  of
           its arrival.

           The cleanup daemon always performs the following transfor-
           mations:

           o      Insert missing message  headers:  (Resent-)  From:,
                  To:, Message-Id:, and Date:.

           o      Extract envelope recipient addresses from (Resent-)
                  To:, Cc: and Bcc: message headers when  no  recipi-
                  ents are specified in the message envelope.

           o      Transform  envelope  and  header  addresses  to the
                  standard user@fully-qualified-domain form  that  is
                  expected  by  other Postfix programs.  This task is
                  delegated to the trivial-rewrite(8) daemon.

           o      Eliminate duplicate envelope recipient addresses.

           The following address transformations are optional:

           o      Optionally,  rewrite  all   envelope   and   header
                  addresses  according  to  the mappings specified in
                  the canonical(5) lookup tables.

           o      Optionally, masquerade  envelope  sender  addresses
                  and  message  header  addresses (i.e. strip host or
                  domain information below all domains listed in  the
                  masquerade_domains parameter, except for user names
                  listed  in  masquerade_exceptions).   By   default,
                  address   masquerading  does  not  affect  envelope
                  recipients.

           o      Optionally, expand envelope recipients according to
                  information  found in the virtual(5) lookup tables.

           The cleanup daemon performs sanity checks on  the  content
           of  each  message.  When it finds a problem, by default it
           returns a diagnostic status to the client, and  leaves  it
           up  to the client to deal with the problem. Alternatively,
           the client can request the cleanup daemon  to  bounce  the
           message back to the sender in case of trouble.

    STANDARDS
           RFC 822 (ARPA Internet Text Messages)

    DIAGNOSTICS
           Problems and transactions are logged to syslogd(8).

    BUGS
           Table-driven  rewriting  rules  make it hard to express if
           then else and other logical relationships.

    CONFIGURATION PARAMETERS
           The following main.cf parameters are  especially  relevant
           to  this  program. See the Postfix main.cf file for syntax
           details and for default values.  Use  the  postfix  reload
           command after a configuration change.

    Content filtering
           body_checks
                  Lookup tables with content filters for message body
                  lines.  These filters see physical lines one  at  a
                  time, in chunks of at most line_length_limit bytes.

           header_checks
                  Lookup tables  with  content  filters  for  message
                  header  lines.   These  filters see logical headers
                  one at a time, including headers that span multiple
                  lines.

    Miscellaneous
           always_bcc
                  Address  to send a copy of each message that enters
                  the system.

           hopcount_limit
                  Limit the number of Received: message headers.

           undisclosed_recipients_header
                  The header line that is inserted when no recipients
                  were specified in (Resent-)To: or (Resent-)Cc: mes-
                  sage headers.

    Address transformations
           empty_address_recipient
                  The destination for  undeliverable  mail  from  <>.
                  This  substitution is done before all other address
                  rewriting.

           canonical_maps
                  Address mapping lookup table for sender and recipi-
                  ent addresses in envelopes and headers.

           recipient_canonical_maps
                  Address  mapping  lookup  table  for  envelope  and
                  header recipient addresses.

           sender_canonical_maps
                  Address  mapping  lookup  table  for  envelope  and
                  header sender addresses.

           masquerade_classes
                  List  of  address  classes subject to masquerading:
                  zero or more of  envelope_sender,  envelope_recipi-
                  ent, header_sender, header_recipient.

           masquerade_domains
                  List  of  domains  that hide their subdomain struc-
                  ture.

           masquerade_exceptions
                  List of user names that are not subject to  address
                  masquerading.

           virtual_maps
                  Address mapping lookup table for envelope recipient
                  addresses.

    Resource controls
           duplicate_filter_limit
                  Limit the number of envelope  recipients  that  are
                  remembered.

           header_size_limit
                  Limit the amount of memory in bytes used to process
                  a message header.

           in_flow_delay
                  Amount of time to pause before accepting a message,
                  when  the  message arrival rate exceeds the message
                  delivery rate.

           extract_recipient_limit
                  Limit the amount of recipients extracted from  mes-
                  sage headers.

    SEE ALSO
           canonical(5) canonical address lookup table format
           qmgr(8) queue manager daemon
           syslogd(8) system logging
           trivial-rewrite(8) address rewriting
           virtual(5) virtual address lookup table format

    FILES
           /etc/postfix/canonical*, canonical mapping table
           /etc/postfix/virtual*, virtual mapping table

    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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