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 transformations: · Insert missing message headers: (Resent-) From:, To:, Message- Id:, and Date:. · Extract envelope recipient addresses from (Resent-) To:, Cc: and Bcc: message headers when no recipients are specified in the message envelope. · Transform envelope and header addresses to the standard user@fully-qualified-domain form that is expected by other Post- fix programs. This task is delegated to the trivial-rewrite(8) daemon. · Eliminate duplicate envelope recipient addresses. The following address transformations are optional: · Optionally, rewrite all envelope and header addresses according to the mappings specified in the canonical(5) lookup tables. · 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. · 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 mes- sage. When it finds a problem, by default it returns a diagnostic sta- tus 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) 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
The following main.cf parameters are especially relevant to this pro- gram. 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. body_checks_size_limit The amount of content per message body segment that is subjected to $body_checks filtering. header_checks mime_header_checks (default: $header_checks) nested_header_checks (default: $header_checks) Lookup tables with content filters for message header lines: respectively, these are applied to the primary message headers (not including MIME headers), to the MIME headers anywhere in the message, and to the initial headers of attached messages. These filters see logical headers one at a time, including head- ers that span multiple lines. MIME Processing disable_mime_input_processing While receiving, give no special treatment to Content-Type: mes- sage headers; all text after the initial message headers is con- sidered to be part of the message body. mime_boundary_length_limit The amount of space that will be allocated for MIME multipart boundary strings. The MIME processor is unable to distinguish between boundary strings that do not differ in the first $mime_boundary_length_limit characters. mime_nesting_limit The maximal nesting level of multipart mail that the MIME pro- cessor can handle. Refuse mail that is nested deeper. strict_8bitmime Turn on both strict_7bit_headers and strict_8bitmime_body. strict_7bit_headers Reject mail with 8-bit text in message headers. This blocks mail from poorly written applications. strict_8bitmime_body Reject mail with 8-bit text in content that claims to be 7-bit, or in content that has no explicit content encoding information. This blocks mail from poorly written mail software. Unfortu- nately, this also breaks majordomo approval requests when the included request contains valid 8-bit MIME mail, and it breaks bounces from mailers that do not properly encapsulate 8-bit con- tent (for example, bounces from qmail or from old versions of Postfix). strict_mime_encoding_domain Reject mail with invalid Content-Transfer-Encoding: information for message/* or multipart/*. This blocks mail from poorly writ- ten software. 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 speci- fied in (Resent-)To: or (Resent-)Cc: message headers. Address transformations empty_address_recipient The destination for undeliverable mail from <>. This substitu- tion is done before all other address rewriting. canonical_maps Address mapping lookup table for sender and recipient 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. canonicalize_envelope_recipient By default (recipient address) canonicalization is applied even to the envelope recipient. To prevent delivery loops when using external canonical addresses, while still having recipient head- ers rewritten to the canonical addresses, set this to 'no'. masquerade_classes List of address classes subject to masquerading: zero or more of envelope_sender, envelope_recipient, header_sender, header_recipient. masquerade_domains List of domains that hide their subdomain structure. masquerade_exceptions List of user names that are not subject to address masquerading. virtual_alias_maps Address mapping lookup table for envelope recipient addresses. Resource controls duplicate_filter_limit Limits the number of envelope recipients that are remembered. header_address_token_limit Limits the number of address tokens used to process a message header. header_size_limit Limits the amount of memory in bytes used to store 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 message 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 alias 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 CLEANUP(8)
Powered by man-cgi (2024-08-26). Maintained for NetBSD by Kimmo Suominen. Based on man-cgi by Panagiotis Christias.