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CLEANUP(8)                  System Manager's Manual                 CLEANUP(8)




NAME
       cleanup - canonicalize and enqueue Postfix message

SYNOPSIS
       cleanup [generic Postfix daemon options]

DESCRIPTION
       The cleanup(8) daemon processes inbound mail, inserts it into the
       incoming mail queue, and informs the queue manager of its arrival.

       The cleanup(8) daemon always performs the following transformations:

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

       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(8) 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(8) daemon to
       bounce the message back to the sender in case of trouble.

STANDARDS
       RFC 822 (ARPA Internet Text Messages)
       RFC 2045 (MIME: Format of Internet Message Bodies)
       RFC 2046 (MIME: Media Types)
       RFC 2822 (Internet Message Format)
       RFC 3463 (Enhanced Status Codes)
       RFC 3464 (Delivery status notifications)
       RFC 5322 (Internet Message Format)

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
       Changes to main.cf are picked up automatically, as cleanup(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.

COMPATIBILITY CONTROLS

       undisclosed_recipients_header (To: undisclosed-recipients:;)
              Message header that the Postfix cleanup(8) server inserts when a
              message contains no To: or Cc: message header.

       Available in Postfix version 2.1 only:

       enable_errors_to (no)
              Report mail delivery errors to the address specified with the
              non-standard Errors-To: message header, instead of the envelope
              sender address (this feature is removed with Postfix version
              2.2, is turned off by default with Postfix version 2.1, and is
              always turned on with older Postfix versions).

       Available in Postfix version 2.6 and later:

       always_add_missing_headers (no)
              Always add (Resent-) From:, To:, Date: or Message-ID: headers
              when not present.

BUILT-IN CONTENT FILTERING CONTROLS
       Postfix built-in content filtering is meant to stop a flood of worms or
       viruses. It is not a general content filter.

       body_checks (empty)
              Optional lookup tables for content inspection as specified in
              the body_checks(5) manual page.

       header_checks (empty)
              Optional lookup tables for content inspection of primary non-
              MIME message headers, as specified in the header_checks(5)
              manual page.

       Available in Postfix version 2.0 and later:

       body_checks_size_limit (51200)
              How much text in a message body segment (or attachment, if you
              prefer to use that term) is subjected to body_checks inspection.

       mime_header_checks ($header_checks)
              Optional lookup tables for content inspection of MIME related
              message headers, as described in the header_checks(5) manual
              page.

       nested_header_checks ($header_checks)
              Optional lookup tables for content inspection of non-MIME
              message headers in attached messages, as described in the
              header_checks(5) manual page.

       Available in Postfix version 2.3 and later:

       message_reject_characters (empty)
              The set of characters that Postfix will reject in message
              content.

       message_strip_characters (empty)
              The set of characters that Postfix will remove from message
              content.

BEFORE QUEUE MILTER CONTROLS
       As of version 2.3, Postfix supports the Sendmail version 8 Milter (mail
       filter) protocol. When mail is not received via the smtpd(8) server,
       the cleanup(8) server will simulate SMTP events to the extent that this
       is possible. For details see the MILTER_README document.

       non_smtpd_milters (empty)
              A list of Milter (mail filter) applications for new mail that
              does not arrive via the Postfix smtpd(8) server.

       milter_protocol (6)
              The mail filter protocol version and optional protocol
              extensions for communication with a Milter application; prior to
              Postfix 2.6 the default protocol is 2.

       milter_default_action (tempfail)
              The default action when a Milter (mail filter) application is
              unavailable or mis-configured.

       milter_macro_daemon_name ($myhostname)
              The {daemon_name} macro value for Milter (mail filter)
              applications.

       milter_macro_v ($mail_name $mail_version)
              The {v} macro value for Milter (mail filter) applications.

       milter_connect_timeout (30s)
              The time limit for connecting to a Milter (mail filter)
              application, and for negotiating protocol options.

       milter_command_timeout (30s)
              The time limit for sending an SMTP command to a Milter (mail
              filter) application, and for receiving the response.

       milter_content_timeout (300s)
              The time limit for sending message content to a Milter (mail
              filter) application, and for receiving the response.

       milter_connect_macros (see 'postconf -d' output)
              The macros that are sent to Milter (mail filter) applications
              after completion of an SMTP connection.

       milter_helo_macros (see 'postconf -d' output)
              The macros that are sent to Milter (mail filter) applications
              after the SMTP HELO or EHLO command.

       milter_mail_macros (see 'postconf -d' output)
              The macros that are sent to Milter (mail filter) applications
              after the SMTP MAIL FROM command.

       milter_rcpt_macros (see 'postconf -d' output)
              The macros that are sent to Milter (mail filter) applications
              after the SMTP RCPT TO command.

       milter_data_macros (see 'postconf -d' output)
              The macros that are sent to version 4 or higher Milter (mail
              filter) applications after the SMTP DATA command.

       milter_unknown_command_macros (see 'postconf -d' output)
              The macros that are sent to version 3 or higher Milter (mail
              filter) applications after an unknown SMTP command.

       milter_end_of_data_macros (see 'postconf -d' output)
              The macros that are sent to Milter (mail filter) applications
              after the message end-of-data.

       Available in Postfix version 2.5 and later:

       milter_end_of_header_macros (see 'postconf -d' output)
              The macros that are sent to Milter (mail filter) applications
              after the end of the message header.

       Available in Postfix version 2.7 and later:

       milter_header_checks (empty)
              Optional lookup tables for content inspection of message headers
              that are produced by Milter applications.

MIME PROCESSING CONTROLS
       Available in Postfix version 2.0 and later:

       disable_mime_input_processing (no)
              Turn off MIME processing while receiving mail.

       mime_boundary_length_limit (2048)
              The maximal length of MIME multipart boundary strings.

       mime_nesting_limit (100)
              The maximal recursion level that the MIME processor will handle.

       strict_8bitmime (no)
              Enable both strict_7bit_headers and strict_8bitmime_body.

       strict_7bit_headers (no)
              Reject mail with 8-bit text in message headers.

       strict_8bitmime_body (no)
              Reject 8-bit message body text without 8-bit MIME content
              encoding information.

       strict_mime_encoding_domain (no)
              Reject mail with invalid Content-Transfer-Encoding: information
              for the message/* or multipart/* MIME content types.

       Available in Postfix version 2.5 and later:

       detect_8bit_encoding_header (yes)
              Automatically detect 8BITMIME body content by looking at
              Content-Transfer-Encoding: message headers; historically, this
              behavior was hard-coded to be "always on".

AUTOMATIC BCC RECIPIENT CONTROLS
       Postfix can automatically add BCC (blind carbon copy) when mail enters
       the mail system:

       always_bcc (empty)
              Optional address that receives a "blind carbon copy" of each
              message that is received by the Postfix mail system.

       Available in Postfix version 2.1 and later:

       sender_bcc_maps (empty)
              Optional BCC (blind carbon-copy) address lookup tables, indexed
              by sender address.

       recipient_bcc_maps (empty)
              Optional BCC (blind carbon-copy) address lookup tables, indexed
              by recipient address.

ADDRESS TRANSFORMATION CONTROLS
       Address rewriting is delegated to the trivial-rewrite(8) daemon.  The
       cleanup(8) server implements table driven address mapping.

       empty_address_recipient (MAILER-DAEMON)
              The recipient of mail addressed to the null address.

       canonical_maps (empty)
              Optional address mapping lookup tables for message headers and
              envelopes.

       recipient_canonical_maps (empty)
              Optional address mapping lookup tables for envelope and header
              recipient addresses.

       sender_canonical_maps (empty)
              Optional address mapping lookup tables for envelope and header
              sender addresses.

       masquerade_classes (envelope_sender, header_sender, header_recipient)
              What addresses are subject to address masquerading.

       masquerade_domains (empty)
              Optional list of domains whose subdomain structure will be
              stripped off in email addresses.

       masquerade_exceptions (empty)
              Optional list of user names that are not subjected to address
              masquerading, even when their address matches
              $masquerade_domains.

       propagate_unmatched_extensions (canonical, virtual)
              What address lookup tables copy an address extension from the
              lookup key to the lookup result.

       Available before Postfix version 2.0:

       virtual_maps (empty)
              Optional lookup tables with a) names of domains for which all
              addresses are aliased to addresses in other local or remote
              domains, and b) addresses that are aliased to addresses in other
              local or remote domains.

       Available in Postfix version 2.0 and later:

       virtual_alias_maps ($virtual_maps)
              Optional lookup tables that alias specific mail addresses or
              domains to other local or remote address.

       Available in Postfix version 2.2 and later:

       canonical_classes (envelope_sender, envelope_recipient, header_sender,
              header_recipient)
              What addresses are subject to canonical_maps address mapping.

       recipient_canonical_classes (envelope_recipient, header_recipient)
              What addresses are subject to recipient_canonical_maps address
              mapping.

       sender_canonical_classes (envelope_sender, header_sender)
              What addresses are subject to sender_canonical_maps address
              mapping.

       remote_header_rewrite_domain (empty)
              Don't rewrite message headers from remote clients at all when
              this parameter is empty; otherwise, rewrite message headers and
              append the specified domain name to incomplete addresses.

RESOURCE AND RATE CONTROLS

       duplicate_filter_limit (1000)
              The maximal number of addresses remembered by the address
              duplicate filter for aliases(5) or virtual(5) alias expansion,
              or for showq(8) queue displays.

       header_size_limit (102400)
              The maximal amount of memory in bytes for storing a message
              header.

       hopcount_limit (50)
              The maximal number of Received:  message headers that is allowed
              in the primary message headers.

       in_flow_delay (1s)
              Time to pause before accepting a new message, when the message
              arrival rate exceeds the message delivery rate.

       message_size_limit (10240000)
              The maximal size in bytes of a message, including envelope
              information.

       Available in Postfix version 2.0 and later:

       header_address_token_limit (10240)
              The maximal number of address tokens are allowed in an address
              message header.

       mime_boundary_length_limit (2048)
              The maximal length of MIME multipart boundary strings.

       mime_nesting_limit (100)
              The maximal recursion level that the MIME processor will handle.

       queue_file_attribute_count_limit (100)
              The maximal number of (name=value) attributes that may be stored
              in a Postfix queue file.

       Available in Postfix version 2.1 and later:

       virtual_alias_expansion_limit (1000)
              The maximal number of addresses that virtual alias expansion
              produces from each original recipient.

       virtual_alias_recursion_limit (1000)
              The maximal nesting depth of virtual alias expansion.

MISCELLANEOUS CONTROLS

       config_directory (see 'postconf -d' output)
              The default location of the Postfix main.cf and master.cf
              configuration files.

       daemon_timeout (18000s)
              How much time a Postfix daemon process may take to handle a
              request before it is terminated by a built-in watchdog timer.

       delay_logging_resolution_limit (2)
              The maximal number of digits after the decimal point when
              logging sub-second delay values.

       delay_warning_time (0h)
              The time after which the sender receives the message headers of
              mail that is still queued.

       ipc_timeout (3600s)
              The time limit for sending or receiving information over an
              internal communication channel.

       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.

       myhostname (see 'postconf -d' output)
              The internet hostname of this mail system.

       myorigin ($myhostname)
              The domain name that locally-posted mail appears to come from,
              and that locally posted mail is delivered to.

       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.

       soft_bounce (no)
              Safety net to keep mail queued that would otherwise be returned
              to the sender.

       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,
              "postfix/smtpd".

       Available in Postfix version 2.1 and later:

       enable_original_recipient (yes)
              Enable support for the X-Original-To message header.

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

SEE ALSO
       trivial-rewrite(8), address rewriting
       qmgr(8), queue manager
       header_checks(5), message header content inspection
       body_checks(5), body parts content inspection
       canonical(5), canonical address lookup table format
       virtual(5), virtual alias lookup table format
       postconf(5), configuration parameters
       master(5), generic daemon options
       master(8), process manager
       syslogd(8), system logging

README FILES
       Use "postconf readme_directory" or "postconf html_directory" to locate
       this information.
       ADDRESS_REWRITING_README Postfix address manipulation
       CONTENT_INSPECTION_README content inspection

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



                                                                    CLEANUP(8)