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CLEANUP(8) 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 man- ager of its arrival. The cleanup(8) daemon always performs the following trans- formations: o Insert missing message headers: (Resent-) From:, To:, Message-Id:, and Date:. o Transform envelope and header addresses to the standard [email protected] 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 con- tent 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. Alterna- tively, 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) 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-recipi- ents:;) Message header that the Postfix cleanup(8) server inserts when a message contains no To: or Cc: mes- sage header. Available in Postfix version 2.1 only: enable_errors_to (no) Report mail delivery errors to the address speci- fied with the non-standard Errors-To: message header, instead of the envelope sender address (this feature is removed with Postfix 2.2, is turned off by default with Postfix 2.1, and is always turned on with older Postfix versions). 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 attach- ment, 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. 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_8bit- mime_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. 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 Post- fix 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 $masquerade_domains. propagate_unmatched_extensions (canonical, virtual) What address lookup tables copy an address exten- sion from the lookup key to the lookup result. Available before Postfix version 2.0: virtual_maps (empty) Optional lookup tables with a) names of domains for which all addresses are aliased to addresses in other local or remote domains, and b) addresses that are aliased to addresses in other local or remote domains. Available in Postfix version 2.0 and later: virtual_alias_maps ($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_canoni- cal_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, re- write 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 vir- tual(5) alias expansion, or for showq(8) queue dis- plays. 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 deliv- ery 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 expan- sion. 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_warning_time (0h) The time after which the sender receives the mes- sage 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 the next service request before exiting. max_use (100) The maximal number of connection requests before a Postfix daemon process terminates. 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 deliv- ered 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 direc- tory. 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 (postfix) 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 ADDRESS_REWRITING_README Postfix address manipulation 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)
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