307 lines
13 KiB
Plaintext
307 lines
13 KiB
Plaintext
# CANONICAL(5) CANONICAL(5)
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#
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# NAME
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# canonical - Postfix canonical table format
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#
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# SYNOPSIS
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# postmap /etc/postfix/canonical
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#
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# postmap -q "string" /etc/postfix/canonical
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#
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# postmap -q - /etc/postfix/canonical <inputfile
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#
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# DESCRIPTION
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# The optional canonical(5) table specifies an address map-
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# ping for local and non-local addresses. The mapping is
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# used by the cleanup(8) daemon, before mail is stored into
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# the queue. The address mapping is recursive.
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#
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# Normally, the canonical(5) table is specified as a text
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# file that serves as input to the postmap(1) command. The
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# result, an indexed file in dbm or db format, is used for
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# fast searching by the mail system. Execute the command
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# "postmap /etc/postfix/canonical" to rebuild an indexed
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# file after changing the corresponding text file.
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#
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# When the table is provided via other means such as NIS,
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# LDAP or SQL, the same lookups are done as for ordinary
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# indexed files.
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#
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# Alternatively, the table can be provided as a regu-
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# lar-expression map where patterns are given as regular
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# expressions, or lookups can be directed to a TCP-based
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# server. In those cases, the lookups are done in a slightly
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# different way as described below under "REGULAR EXPRESSION
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# TABLES" or "TCP-BASED TABLES".
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#
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# By default the canonical(5) mapping affects both message
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# header addresses (i.e. addresses that appear inside mes-
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# sages) and message envelope addresses (for example, the
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# addresses that are used in SMTP protocol commands). This
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# is controlled with the canonical_classes parameter.
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#
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# NOTE: Postfix versions 2.2 and later rewrite message head-
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# ers from remote SMTP clients only if the client matches
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# the local_header_rewrite_clients parameter, or if the
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# remote_header_rewrite_domain configuration parameter spec-
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# ifies a non-empty value. To get the behavior before Post-
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# fix 2.2, specify "local_header_rewrite_clients =
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# static:all".
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#
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# Typically, one would use the canonical(5) table to replace
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# login names by Firstname.Lastname, or to clean up
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# addresses produced by legacy mail systems.
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#
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# The canonical(5) mapping is not to be confused with vir-
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# tual alias support or with local aliasing. To change the
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# destination but not the headers, use the virtual(5) or
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# aliases(5) map instead.
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#
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# CASE FOLDING
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# The search string is folded to lowercase before database
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# lookup. As of Postfix 2.3, the search string is not case
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# folded with database types such as regexp: or pcre: whose
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# lookup fields can match both upper and lower case.
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#
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# TABLE FORMAT
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# The input format for the postmap(1) command is as follows:
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#
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# pattern address
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# When pattern matches a mail address, replace it by
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# the corresponding address.
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#
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# blank lines and comments
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# Empty lines and whitespace-only lines are ignored,
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# as are lines whose first non-whitespace character
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# is a `#'.
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#
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# multi-line text
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# A logical line starts with non-whitespace text. A
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# line that starts with whitespace continues a logi-
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# cal line.
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#
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# TABLE SEARCH ORDER
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# With lookups from indexed files such as DB or DBM, or from
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# networked tables such as NIS, LDAP or SQL, each
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# user@domain query produces a sequence of query patterns as
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# described below.
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#
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# Each query pattern is sent to each specified lookup table
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# before trying the next query pattern, until a match is
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# found.
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#
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# user@domain address
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# Replace user@domain by address. This form has the
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# highest precedence.
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#
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# This is useful to clean up addresses produced by
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# legacy mail systems. It can also be used to pro-
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# duce Firstname.Lastname style addresses, but see
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# below for a simpler solution.
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#
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# user address
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# Replace user@site by address when site is equal to
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# $myorigin, when site is listed in $mydestination,
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# or when it is listed in $inet_interfaces or
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# $proxy_interfaces.
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#
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# This form is useful for replacing login names by
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# Firstname.Lastname.
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#
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# @domain address
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# Replace other addresses in domain by address. This
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# form has the lowest precedence.
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#
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# Note: @domain is a wild-card. When this form is
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# applied to recipient addresses, the Postfix SMTP
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# server accepts mail for any recipient in domain,
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# regardless of whether that recipient exists. This
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# may turn your mail system into a backscatter
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# source: Postfix first accepts mail for non-existent
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# recipients and then tries to return that mail as
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# "undeliverable" to the often forged sender address.
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#
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# To avoid backscatter with mail for a wild-card
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# domain, replace the wild-card mapping with explicit
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# 1:1 mappings, or add a reject_unverified_recipient
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# restriction for that domain:
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#
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# smtpd_recipient_restrictions =
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# ...
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# reject_unauth_destination
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# check_recipient_access
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# inline:{example.com=reject_unverified_recipient}
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# unverified_recipient_reject_code = 550
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#
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# In the above example, Postfix may contact a remote
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# server if the recipient is rewritten to a remote
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# address.
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#
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# RESULT ADDRESS REWRITING
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# The lookup result is subject to address rewriting:
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#
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# o When the result has the form @otherdomain, the
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# result becomes the same user in otherdomain.
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#
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# o When "append_at_myorigin=yes", append "@$myorigin"
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# to addresses without "@domain".
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#
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# o When "append_dot_mydomain=yes", append ".$mydomain"
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# to addresses without ".domain".
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#
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# ADDRESS EXTENSION
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# When a mail address localpart contains the optional recip-
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# ient delimiter (e.g., user+foo@domain), the lookup order
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# becomes: user+foo@domain, user@domain, user+foo, user, and
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# @domain.
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#
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# The propagate_unmatched_extensions parameter controls
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# whether an unmatched address extension (+foo) is propa-
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# gated to the result of table lookup.
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#
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# REGULAR EXPRESSION TABLES
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# This section describes how the table lookups change when
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# the table is given in the form of regular expressions. For
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# a description of regular expression lookup table syntax,
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# see regexp_table(5) or pcre_table(5).
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#
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# Each pattern is a regular expression that is applied to
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# the entire address being looked up. Thus, user@domain mail
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# addresses are not broken up into their user and @domain
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# constituent parts, nor is user+foo broken up into user and
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# foo.
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#
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# Patterns are applied in the order as specified in the ta-
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# ble, until a pattern is found that matches the search
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# string.
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#
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# Results are the same as with indexed file lookups, with
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# the additional feature that parenthesized substrings from
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# the pattern can be interpolated as $1, $2 and so on.
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#
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# TCP-BASED TABLES
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# This section describes how the table lookups change when
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# lookups are directed to a TCP-based server. For a descrip-
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# tion of the TCP client/server lookup protocol, see tcp_ta-
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# ble(5). This feature is not available up to and including
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# Postfix version 2.4.
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#
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# Each lookup operation uses the entire address once. Thus,
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# user@domain mail addresses are not broken up into their
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# user and @domain constituent parts, nor is user+foo broken
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# up into user and foo.
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#
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# Results are the same as with indexed file lookups.
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#
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# BUGS
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# The table format does not understand quoting conventions.
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#
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# CONFIGURATION PARAMETERS
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# The following main.cf parameters are especially relevant.
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# The text below provides only a parameter summary. See
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# postconf(5) for more details including examples.
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#
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# canonical_classes (envelope_sender, envelope_recipient,
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# header_sender, header_recipient)
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# What addresses are subject to canonical_maps
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# address mapping.
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#
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# canonical_maps (empty)
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# Optional address mapping lookup tables for message
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# headers and envelopes.
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#
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# recipient_canonical_maps (empty)
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# Optional address mapping lookup tables for envelope
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# and header recipient addresses.
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#
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# sender_canonical_maps (empty)
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# Optional address mapping lookup tables for envelope
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# and header sender addresses.
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#
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# propagate_unmatched_extensions (canonical, virtual)
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# What address lookup tables copy an address exten-
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# sion from the lookup key to the lookup result.
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#
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# Other parameters of interest:
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#
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# inet_interfaces (all)
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# The local network interface addresses that this
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# mail system receives mail on.
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#
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# local_header_rewrite_clients (permit_inet_interfaces)
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# Rewrite or add message headers in mail from these
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# clients, updating incomplete addresses with the
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# domain name in $myorigin or $mydomain, and adding
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# missing headers.
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#
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# proxy_interfaces (empty)
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# The remote network interface addresses that this
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# mail system receives mail on by way of a proxy or
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# network address translation unit.
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#
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# masquerade_classes (envelope_sender, header_sender,
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# header_recipient)
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# What addresses are subject to address masquerading.
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#
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# masquerade_domains (empty)
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# Optional list of domains whose subdomain structure
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# will be stripped off in email addresses.
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#
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# masquerade_exceptions (empty)
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# Optional list of user names that are not subjected
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# to address masquerading, even when their addresses
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# match $masquerade_domains.
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#
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# mydestination ($myhostname, localhost.$mydomain, local-
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# host)
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# The list of domains that are delivered via the
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# $local_transport mail delivery transport.
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#
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# myorigin ($myhostname)
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# The domain name that locally-posted mail appears to
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# come from, and that locally posted mail is deliv-
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# ered to.
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#
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# owner_request_special (yes)
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# Enable special treatment for owner-listname entries
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# in the aliases(5) file, and don't split owner-list-
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# name and listname-request address localparts when
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# the recipient_delimiter is set to "-".
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#
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# remote_header_rewrite_domain (empty)
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# Rewrite or add message headers in mail from remote
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# clients if the remote_header_rewrite_domain parame-
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# ter value is non-empty, updating incomplete
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# addresses with the domain specified in the
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# remote_header_rewrite_domain parameter, and adding
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# missing headers.
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#
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# SEE ALSO
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# cleanup(8), canonicalize and enqueue mail
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# postmap(1), Postfix lookup table manager
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# postconf(5), configuration parameters
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# virtual(5), virtual aliasing
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#
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# README FILES
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# Use "postconf readme_directory" or "postconf html_direc-
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# tory" to locate this information.
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# DATABASE_README, Postfix lookup table overview
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# ADDRESS_REWRITING_README, address rewriting guide
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#
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# LICENSE
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# The Secure Mailer license must be distributed with this
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# software.
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#
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# AUTHOR(S)
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# Wietse Venema
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# IBM T.J. Watson Research
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# P.O. Box 704
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# Yorktown Heights, NY 10598, USA
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#
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# Wietse Venema
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# Google, Inc.
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# 111 8th Avenue
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# New York, NY 10011, USA
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#
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# CANONICAL(5)
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