/*++ /* NAME /* cleanup 8 /* SUMMARY /* canonicalize and enqueue Postfix message /* SYNOPSIS /* \fBcleanup\fR [generic Postfix daemon options] /* DESCRIPTION /* The \fBcleanup\fR(8) daemon processes inbound mail, inserts it /* into the \fBincoming\fR mail queue, and informs the queue /* manager of its arrival. /* /* The \fBcleanup\fR(8) daemon performs the following transformations: /* .IP \(bu /* Insert missing message headers: (\fBResent-\fR) \fBFrom:\fR, /* \fBTo:\fR, \fBMessage-Id:\fR, and \fBDate:\fR. /* .br /* This is enabled with the \fBlocal_header_rewrite_clients\fR and /* \fBalways_add_missing_headers\fR parameter settings. /* .IP \(bu /* Transform envelope and header addresses to the standard /* \fIuser@fully-qualified-domain\fR form that is expected by other /* Postfix programs. /* This task depends on the \fBtrivial-rewrite\fR(8) daemon. /* .br /* The header transformation is enabled with the /* \fBlocal_header_rewrite_clients\fR parameter setting. /* .IP \(bu /* Eliminate duplicate envelope recipient addresses. /* .br /* This is enabled with the \fBduplicate_filter_limit\fR /* parameter setting. /* .IP \(bu /* Remove message headers: \fBBcc\fR, \fBContent-Length\fR, /* \fBResent-Bcc\fR, \fBReturn-Path\fR. /* .br /* This is enabled with the message_drop_headers parameter /* setting. /* .IP \(bu /* Optionally, rewrite all envelope and header addresses according /* to the mappings specified in the \fBcanonical\fR(5) lookup tables. /* .br /* The header transformation is enabled with the /* \fBlocal_header_rewrite_clients\fR parameter setting. /* .IP \(bu /* Optionally, masquerade envelope sender addresses and message /* header addresses (i.e. strip host or domain information below /* all domains listed in the \fBmasquerade_domains\fR parameter, /* except for user names listed in \fBmasquerade_exceptions\fR). /* By default, address masquerading does not affect envelope recipients. /* .br /* The header transformation is enabled with the /* \fBlocal_header_rewrite_clients\fR parameter setting. /* .IP \(bu /* Optionally, expand envelope recipients according to information /* found in the \fBvirtual_alias_maps\fR lookup tables. /* .PP /* The \fBcleanup\fR(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 \fBcleanup\fR(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) /* RFC 8689 (TLS-Required: message header) /* DIAGNOSTICS /* Problems and transactions are logged to \fBsyslogd\fR(8) /* or \fBpostlogd\fR(8). /* BUGS /* Table-driven rewriting rules make it hard to express \fBif then /* else\fR and other logical relationships. /* CONFIGURATION PARAMETERS /* .ad /* .fi /* Changes to \fBmain.cf\fR are picked up automatically, as /* \fBcleanup\fR(8) /* processes run for only a limited amount of time. Use the command /* "\fBpostfix reload\fR" to speed up a change. /* /* The text below provides only a parameter summary. See /* \fBpostconf\fR(5) for more details including examples. /* COMPATIBILITY CONTROLS /* .ad /* .fi /* .IP "\fBundisclosed_recipients_header (see 'postconf -d' output)\fR" /* Message header that the Postfix \fBcleanup\fR(8) server inserts when a /* message contains no To: or Cc: message header. /* .PP /* Available in Postfix version 2.1 only: /* .IP "\fBenable_errors_to (no)\fR" /* 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). /* .PP /* Available in Postfix version 2.6 and later: /* .IP "\fBalways_add_missing_headers (no)\fR" /* Always add (Resent-) From:, To:, Date: or Message-ID: headers /* when not present. /* .PP /* Available in Postfix version 2.9 and later: /* .IP "\fBenable_long_queue_ids (no)\fR" /* Enable long, non-repeating, queue IDs (queue file names). /* HEADER FORMATTING CONTROLS /* .ad /* .fi /* .PP /* Available in Postfix version 3.0 and later: /* .IP "\fBmessage_drop_headers (bcc, content-length, resent-bcc, return-path)\fR" /* Names of message headers that the \fBcleanup\fR(8) daemon will remove /* after applying \fBheader_checks\fR(5) and before invoking Milter applications. /* .PP /* Available in Postfix version 3.3 and later: /* .IP "\fBheader_from_format (standard)\fR" /* The format of the Postfix-generated \fBFrom:\fR header. /* .PP /* Available in Postfix version 3.10 and later: /* .IP "\fBfull_name_encoding_charset (utf-8)\fR" /* The character set name (also called "charset") that Postfix /* will output when it automatically generates an RFC 2047 encoded /* full name. /* .IP "\fBnon_empty_end_of_header_action (fix_quietly)\fR" /* How the \fBcleanup\fR(8) daemon will process a message when the primary /* message header is terminated with a non-empty line. /* BUILT-IN CONTENT FILTERING CONTROLS /* .ad /* .fi /* Postfix built-in content filtering is meant to stop a flood of /* worms or viruses. It is not a general content filter. /* .IP "\fBbody_checks (empty)\fR" /* Optional lookup tables for content inspection as specified in /* the \fBbody_checks\fR(5) manual page. /* .IP "\fBheader_checks (empty)\fR" /* Optional lookup tables for content inspection of primary non-MIME /* message headers, as specified in the \fBheader_checks\fR(5) manual page. /* .PP /* Available in Postfix version 2.0 and later: /* .IP "\fBbody_checks_size_limit (51200)\fR" /* How much text in a message body segment (or attachment, if you /* prefer to use that term) is subjected to body_checks inspection. /* .IP "\fBmime_header_checks ($header_checks)\fR" /* Optional lookup tables for content inspection of MIME related /* message headers, as described in the \fBheader_checks\fR(5) manual page. /* .IP "\fBnested_header_checks ($header_checks)\fR" /* Optional lookup tables for content inspection of non-MIME message /* headers in attached messages, as described in the \fBheader_checks\fR(5) /* manual page. /* .PP /* Available in Postfix version 2.3 and later: /* .IP "\fBmessage_reject_characters (empty)\fR" /* The set of characters that Postfix will reject in message /* content. /* .IP "\fBmessage_strip_characters (empty)\fR" /* The set of characters that Postfix will remove from message /* content. /* .PP /* Available in Postfix version 3.9, 3.8.5, 3.7.10, 3.6.14, /* 3.5.24, and later: /* .IP "\fBcleanup_replace_stray_cr_lf (yes)\fR" /* 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 /* .ad /* .fi /* 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. /* .IP "\fBnon_smtpd_milters (empty)\fR" /* A list of Milter (mail filter) applications for new mail that /* does not arrive via the Postfix \fBsmtpd\fR(8) server. /* .IP "\fBmilter_protocol (6)\fR" /* 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. /* .IP "\fBmilter_default_action (Postfix >= 3.11: shutdown; Postfix < 3.11: tempfail)\fR" /* The default action when a Milter (mail filter) response is /* unavailable (for example, bad Postfix configuration or Milter /* failure). /* .IP "\fBmilter_macro_daemon_name ($myhostname)\fR" /* The {daemon_name} macro value for Milter (mail filter) applications. /* .IP "\fBmilter_macro_v ($mail_name $mail_version)\fR" /* The {v} macro value for Milter (mail filter) applications. /* .IP "\fBmilter_connect_timeout (30s)\fR" /* The time limit for connecting to a Milter (mail filter) /* application, and for negotiating protocol options. /* .IP "\fBmilter_command_timeout (30s)\fR" /* The time limit for sending an SMTP command to a Milter (mail /* filter) application, and for receiving the response. /* .IP "\fBmilter_content_timeout (300s)\fR" /* The time limit for sending message content to a Milter (mail /* filter) application, and for receiving the response. /* .IP "\fBmilter_connect_macros (see 'postconf -d' output)\fR" /* The macros that are sent to Milter (mail filter) applications /* after completion of an SMTP connection. /* .IP "\fBmilter_helo_macros (see 'postconf -d' output)\fR" /* The macros that are sent to Milter (mail filter) applications /* after the SMTP HELO or EHLO command. /* .IP "\fBmilter_mail_macros (see 'postconf -d' output)\fR" /* The macros that are sent to Milter (mail filter) applications /* after the SMTP MAIL FROM command. /* .IP "\fBmilter_rcpt_macros (see 'postconf -d' output)\fR" /* The macros that are sent to Milter (mail filter) applications /* after the SMTP RCPT TO command. /* .IP "\fBmilter_data_macros (see 'postconf -d' output)\fR" /* The macros that are sent to version 4 or higher Milter (mail /* filter) applications after the SMTP DATA command. /* .IP "\fBmilter_unknown_command_macros (see 'postconf -d' output)\fR" /* The macros that are sent to version 3 or higher Milter (mail /* filter) applications after an unknown SMTP command. /* .IP "\fBmilter_end_of_data_macros (see 'postconf -d' output)\fR" /* The macros that are sent to Milter (mail filter) applications /* after the message end-of-data. /* .PP /* Available in Postfix version 2.5 and later: /* .IP "\fBmilter_end_of_header_macros (see 'postconf -d' output)\fR" /* The macros that are sent to Milter (mail filter) applications /* after the end of the message header. /* .PP /* Available in Postfix version 2.7 and later: /* .IP "\fBmilter_header_checks (empty)\fR" /* Optional lookup tables for content inspection of message headers /* that are produced by Milter applications. /* .PP /* Available in Postfix version 3.1 and later: /* .IP "\fBmilter_macro_defaults (empty)\fR" /* Optional list of \fIname=value\fR pairs that specify default /* values for arbitrary macros that Postfix may send to Milter /* applications. /* MIME PROCESSING CONTROLS /* .ad /* .fi /* Available in Postfix version 2.0 and later: /* .IP "\fBdisable_mime_input_processing (no)\fR" /* Turn off MIME processing while receiving mail. /* .IP "\fBmime_boundary_length_limit (2048)\fR" /* The maximal length of MIME multipart boundary strings. /* .IP "\fBmime_nesting_limit (100)\fR" /* The maximal recursion level that the MIME processor will handle. /* .IP "\fBstrict_8bitmime (no)\fR" /* Enable both strict_7bit_headers and strict_8bitmime_body. /* .IP "\fBstrict_7bit_headers (no)\fR" /* Reject mail with 8-bit text in message headers. /* .IP "\fBstrict_8bitmime_body (no)\fR" /* Reject 8-bit message body text without 8-bit MIME content encoding /* information. /* .IP "\fBstrict_mime_encoding_domain (no)\fR" /* Reject mail with invalid Content-Transfer-Encoding: information /* for the message/* or multipart/* MIME content types. /* .PP /* Available in Postfix version 2.5 and later: /* .IP "\fBdetect_8bit_encoding_header (yes)\fR" /* 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 /* .ad /* .fi /* Postfix can automatically add BCC (blind carbon copy) /* when mail enters the mail system: /* .IP "\fBalways_bcc (empty)\fR" /* Optional address that receives a "blind carbon copy" of each message /* that is received by the Postfix mail system. /* .PP /* Available in Postfix version 2.1 and later: /* .IP "\fBsender_bcc_maps (empty)\fR" /* Optional BCC (blind carbon-copy) address lookup tables, indexed /* by envelope sender address. /* .IP "\fBrecipient_bcc_maps (empty)\fR" /* Optional BCC (blind carbon-copy) address lookup tables, indexed by /* envelope recipient address. /* ADDRESS TRANSFORMATION CONTROLS /* .ad /* .fi /* Address rewriting is delegated to the \fBtrivial-rewrite\fR(8) daemon. /* The \fBcleanup\fR(8) server implements table driven address mapping. /* .IP "\fBempty_address_recipient (MAILER-DAEMON)\fR" /* The recipient of mail addressed to the null address. /* .IP "\fBcanonical_maps (empty)\fR" /* Optional address mapping lookup tables for message headers and /* envelopes. /* .IP "\fBrecipient_canonical_maps (empty)\fR" /* Optional address mapping lookup tables for envelope and header /* recipient addresses. /* .IP "\fBsender_canonical_maps (empty)\fR" /* Optional address mapping lookup tables for envelope and header /* sender addresses. /* .IP "\fBmasquerade_classes (envelope_sender, header_sender, header_recipient)\fR" /* What addresses are subject to address masquerading. /* .IP "\fBmasquerade_domains (empty)\fR" /* Optional list of domains whose subdomain structure will be stripped /* off in email addresses. /* .IP "\fBmasquerade_exceptions (empty)\fR" /* Optional list of user names that are not subjected to address /* masquerading, even when their addresses match $masquerade_domains. /* .IP "\fBpropagate_unmatched_extensions (canonical, virtual)\fR" /* What address lookup tables copy an address extension from the lookup /* key to the lookup result. /* .PP /* Available before Postfix version 2.0: /* .IP "\fBvirtual_maps (empty)\fR" /* Optional lookup tables with a) names of domains for which all /* addresses are aliased to addresses in other local or remote domains, /* and b) addresses that are aliased to addresses in other local or /* remote domains. /* .PP /* Available in Postfix version 2.0 and later: /* .IP "\fBvirtual_alias_maps ($virtual_maps)\fR" /* Optional lookup tables that are often searched with a full email /* address (including domain) and that apply to all recipients: \fBlocal\fR(8), /* virtual, and remote; this is unlike alias_maps that are only searched /* with an email address localpart (no domain) and that apply /* only to \fBlocal\fR(8) recipients. /* .PP /* Available in Postfix version 2.2 and later: /* .IP "\fBcanonical_classes (envelope_sender, envelope_recipient, header_sender, header_recipient)\fR" /* What addresses are subject to canonical_maps address mapping. /* .IP "\fBrecipient_canonical_classes (envelope_recipient, header_recipient)\fR" /* What addresses are subject to recipient_canonical_maps address /* mapping. /* .IP "\fBsender_canonical_classes (envelope_sender, header_sender)\fR" /* What addresses are subject to sender_canonical_maps address /* mapping. /* .IP "\fBremote_header_rewrite_domain (empty)\fR" /* Rewrite or add message headers in mail from remote clients if /* the remote_header_rewrite_domain parameter value is non-empty, /* updating incomplete addresses with the domain specified in the /* remote_header_rewrite_domain parameter, and adding missing headers. /* RESOURCE AND RATE CONTROLS /* .ad /* .fi /* .IP "\fBduplicate_filter_limit (1000)\fR" /* The maximal number of addresses remembered by the address /* duplicate filter for \fBaliases\fR(5) or \fBvirtual\fR(5) alias expansion, or /* for \fBshowq\fR(8) queue displays. /* .IP "\fBheader_size_limit (102400)\fR" /* The maximal amount of memory in bytes for storing a message header. /* .IP "\fBhopcount_limit (50)\fR" /* The maximal number of Received: message headers that is allowed /* in the primary message headers. /* .IP "\fBin_flow_delay (1s)\fR" /* Time to pause before accepting a new message, when the message /* arrival rate exceeds the message delivery rate. /* .IP "\fBmessage_size_limit (10240000)\fR" /* The maximal size in bytes of a message, including envelope information. /* .PP /* Available in Postfix version 2.0 and later: /* .IP "\fBheader_address_token_limit (10240)\fR" /* The maximal number of address tokens are allowed in an address /* message header. /* .IP "\fBmime_boundary_length_limit (2048)\fR" /* The maximal length of MIME multipart boundary strings. /* .IP "\fBmime_nesting_limit (100)\fR" /* The maximal recursion level that the MIME processor will handle. /* .IP "\fBqueue_file_attribute_count_limit (100)\fR" /* The maximal number of (name=value) attributes that may be stored /* in a Postfix queue file. /* .PP /* Available in Postfix version 2.1 and later: /* .IP "\fBvirtual_alias_expansion_limit (1000)\fR" /* The maximal number of addresses that virtual alias expansion produces /* from each original recipient. /* .IP "\fBvirtual_alias_recursion_limit (1000)\fR" /* The maximal nesting depth of virtual alias expansion. /* .PP /* Available in Postfix version 3.0 and later: /* .IP "\fBvirtual_alias_address_length_limit (1000)\fR" /* The maximal length of an email address after virtual alias expansion. /* SMTPUTF8 CONTROLS /* .ad /* .fi /* Preliminary SMTPUTF8 support is introduced with Postfix 3.0. /* .IP "\fBsmtputf8_enable (yes)\fR" /* Enable preliminary SMTPUTF8 support for the protocols described /* in RFC 6531, RFC 6532, and RFC 6533. /* .IP "\fBsmtputf8_autodetect_classes (sendmail, verify)\fR" /* Detect that a message requires SMTPUTF8 support for the specified /* mail origin classes. /* .PP /* Available in Postfix version 3.2 and later: /* .IP "\fBenable_idna2003_compatibility (no)\fR" /* Enable 'transitional' compatibility between IDNA2003 and IDNA2008, /* when converting UTF-8 domain names to/from the ASCII form that is /* used for DNS lookups. /* TLS SUPPORT /* .ad /* .fi /* Available in Postfix version 3.10 and later: /* .IP "\fBtls_required_enable (yes)\fR" /* Enable support for the "TLS-Required: no" message header, defined /* in RFC 8689. /* .IP "\fBrequiretls_esmtp_header (yes)\fR" /* Record the ESMTP REQUIRETLS request in a "Require-TLS-ESMTP: /* yes" message header. /* MISCELLANEOUS CONTROLS /* .ad /* .fi /* .IP "\fBconfig_directory (see 'postconf -d' output)\fR" /* The default location of the Postfix main.cf and master.cf /* configuration files. /* .IP "\fBdaemon_timeout (18000s)\fR" /* How much time a Postfix daemon process may take to handle a /* request before it is terminated by a built-in watchdog timer. /* .IP "\fBdelay_logging_resolution_limit (2)\fR" /* The maximal number of digits after the decimal point when logging /* delay values. /* .IP "\fBdelay_warning_time (0h)\fR" /* The time after which the sender receives a copy of the message /* headers of mail that is still queued. /* .IP "\fBipc_timeout (3600s)\fR" /* The time limit for sending or receiving information over an internal /* communication channel. /* .IP "\fBmax_idle (100s)\fR" /* The maximum amount of time that an idle Postfix daemon process waits /* for an incoming connection before terminating voluntarily. /* .IP "\fBmax_use (100)\fR" /* The maximal number of incoming connections that a Postfix daemon /* process will service before terminating voluntarily. /* .IP "\fBmyhostname (see 'postconf -d' output)\fR" /* The internet hostname of this mail system. /* .IP "\fBmyorigin ($myhostname)\fR" /* The domain name that locally-posted mail appears to come /* from, and that locally posted mail is delivered to. /* .IP "\fBprocess_id (read-only)\fR" /* The process ID of a Postfix command or daemon process. /* .IP "\fBprocess_name (read-only)\fR" /* The process name of a Postfix command or daemon process. /* .IP "\fBqueue_directory (see 'postconf -d' output)\fR" /* The location of the Postfix top-level queue directory. /* .IP "\fBsoft_bounce (no)\fR" /* Safety net to keep mail queued that would otherwise be returned to /* the sender. /* .IP "\fBsyslog_facility (mail)\fR" /* The syslog facility of Postfix logging. /* .IP "\fBsyslog_name (see 'postconf -d' output)\fR" /* A prefix that is prepended to the process name in syslog /* records, so that, for example, "smtpd" becomes "prefix/smtpd". /* .PP /* Available in Postfix version 2.1 and later: /* .IP "\fBenable_original_recipient (yes)\fR" /* Enable support for the original recipient address after an /* address is rewritten to a different address (for example with /* aliasing or with canonical mapping). /* .PP /* Available in Postfix 3.3 and later: /* .IP "\fBservice_name (read-only)\fR" /* The master.cf service name of a Postfix daemon process. /* .PP /* Available in Postfix 3.5 and later: /* .IP "\fBinfo_log_address_format (external)\fR" /* The email address form that will be used in non-debug logging /* (info, warning, etc.). /* .PP /* Available in Postfix 3.9 and later: /* .IP "\fBforce_mime_input_conversion (no)\fR" /* Convert body content that claims to be 8-bit into quoted-printable, /* before header_checks, body_checks, Milters, and before after-queue /* content filters. /* 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 /* .ad /* .fi /* Use "\fBpostconf readme_directory\fR" or /* "\fBpostconf html_directory\fR" to locate this information. /* .na /* .nf /* ADDRESS_REWRITING_README Postfix address manipulation /* CONTENT_INSPECTION_README content inspection /* LICENSE /* .ad /* .fi /* 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 /* /* Wietse Venema /* porcupine.org
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