Provided by: postfix_3.6.4-1ubuntu1.3_amd64 
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 performs the following transformations:
• Insert missing message headers: (Resent-) From:, To:, Message-Id:, and Date:.
This is enabled with the local_header_rewrite_clients and
always_add_missing_headers parameter settings.
• Transform envelope and header addresses to the standard user@fully-qualified-domain
form that is expected by other Postfix programs. This task depends on the
trivial-rewrite(8) daemon.
The header transformation is enabled with the local_header_rewrite_clients
parameter setting.
• Eliminate duplicate envelope recipient addresses.
This is enabled with the duplicate_filter_limit parameter setting.
• Remove message headers: Bcc, Content-Length, Resent-Bcc, Return-Path.
This is enabled with the message_drop_headers parameter setting.
• Optionally, rewrite all envelope and header addresses according to the mappings
specified in the canonical(5) lookup tables.
The header transformation is enabled with the local_header_rewrite_clients
parameter setting.
• 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.
The header transformation is enabled with the local_header_rewrite_clients
parameter setting.
• Optionally, expand envelope recipients according to information found in the
virtual_alias_maps 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 cleanup service 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) or postlogd(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 (see 'postconf -d' output)
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.
Available in Postfix version 2.9 and later:
enable_long_queue_ids (no)
Enable long, non-repeating, queue IDs (queue file names).
Available in Postfix version 3.0 and later:
message_drop_headers (bcc, content-length, resent-bcc, return-path)
Names of message headers that the cleanup(8) daemon will remove after applying
header_checks(5) and before invoking Milter applications.
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.
Available in Postfix version 3.9, 3.8.5, 3.7.10, 3.6.14, 3.5.24, and later:
cleanup_replace_stray_cr_lf (yes)
Replace each stray <CR> or <LF> character in message content with a space
character, to prevent outbound SMTP smuggling, and to make the evaluation of
Postfix-added DKIM or other signatures independent from how a remote mail server
handles such characters.
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) response is unavailable (for
example, bad Postfix configuration or Milter failure).
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.
Available in Postfix version 3.1 and later:
milter_macro_defaults (empty)
Optional list of name=value pairs that specify default values for arbitrary macros
that Postfix may send to 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 addresses match $masquerade_domains.
propagate_unmatched_extensions (canonical, virtual)
What address lookup tables copy an address extension from the lookup key to the
lookup result.
Available before Postfix version 2.0:
virtual_maps (empty)
Optional lookup tables with a) names of domains for which all addresses are aliased
to addresses in other local or remote domains, and b) addresses that are aliased to
addresses in other local or remote domains.
Available in Postfix version 2.0 and later:
virtual_alias_maps ($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.
Available in Postfix version 3.0 and later:
virtual_alias_address_length_limit (1000)
The maximal length of an email address after virtual alias expansion.
SMTPUTF8 CONTROLS
Preliminary SMTPUTF8 support is introduced with Postfix 3.0.
smtputf8_enable (yes)
Enable preliminary SMTPUTF8 support for the protocols described in RFC 6531..6533.
smtputf8_autodetect_classes (sendmail, verify)
Detect that a message requires SMTPUTF8 support for the specified mail origin
classes.
Available in Postfix version 3.2 and later:
enable_idna2003_compatibility (no)
Enable 'transitional' compatibility between IDNA2003 and IDNA2008, when converting
UTF-8 domain names to/from the ASCII form that is used for DNS lookups.
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 a copy of 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)
A prefix that is prepended to the process name in syslog records, so that, for
example, "smtpd" becomes "prefix/smtpd".
Available in Postfix version 2.1 and later:
enable_original_recipient (yes)
Enable support for the original recipient address after an address is rewritten to
a different address (for example with aliasing or with canonical mapping).
Available in Postfix 3.3 and later:
service_name (read-only)
The master.cf service name of a Postfix daemon process.
Available in Postfix 3.5 and later:
info_log_address_format (external)
The email address form that will be used in non-debug logging (info, warning,
etc.).
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
postlogd(8), Postfix logging
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
Wietse Venema
Google, Inc.
111 8th Avenue
New York, NY 10011, USA
CLEANUP(8postfix)