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Postfix manual - canonical(5)

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CANONICAL(5) CANONICAL(5) NAME canonical - Postfix canonical table format SYNOPSIS postmap /etc/postfix/canonical postmap -q "string" /etc/postfix/canonical postmap -q - /etc/postfix/canonical <inputfile DESCRIPTION The optional canonical(5) table specifies an address map- ping for local and non-local addresses. The mapping is used by the cleanup(8) daemon, before mail is stored into the queue. The address mapping is recursive. Normally, the canonical(5) table is specified as a text file that serves as input to the postmap(1) command. The result, an indexed file in dbm or db format, is used for fast searching by the mail system. Execute the command "postmap /etc/postfix/canonical" in order to rebuild the indexed file after changing the text file. When the table is provided via other means such as NIS, LDAP or SQL, the same lookups are done as for ordinary indexed files. Alternatively, the table can be provided as a regular- expression map where patterns are given as regular expres- sions, or lookups can be directed to TCP-based server. In that case, the lookups are done in a slightly different way as described below under "REGULAR EXPRESSION TABLES" and "TCP-BASED TABLES". By default the canonical(5) mapping affects both message header addresses (i.e. addresses that appear inside mes- sages) and message envelope addresses (for example, the addresses that are used in SMTP protocol commands). Think Sendmail rule set S3, if you like. This is controlled with the canonical_classes parameter. NOTE: Postfix versions 2.2 and later rewrite message head- ers from remote SMTP clients only if the client matches the local_header_rewrite_clients parameter, or if the remote_header_rewrite_domain configuration parameter spec- ifies a non-empty value. To get the behavior before Post- fix 2.2, specify "local_header_rewrite_clients = static:all". Typically, one would use the canonical(5) table to replace login names by Firstname.Lastname, or to clean up addresses produced by legacy mail systems. The canonical(5) mapping is not to be confused with vir- tual domain support. Use the virtual(5) map for that pur- pose. The canonical(5) mapping is not to be confused with local aliasing. Use the aliases(5) map for that purpose. TABLE FORMAT The input format for the postmap(1) command is as follows: pattern result When pattern matches a mail address, replace it by the corresponding result. blank lines and comments Empty lines and whitespace-only lines are ignored, as are lines whose first non-whitespace character is a `#'. multi-line text A logical line starts with non-whitespace text. A line that starts with whitespace continues a logi- cal line. TABLE SEARCH ORDER With lookups from indexed files such as DB or DBM, or from networked tables such as NIS, LDAP or SQL, patterns are tried in the order as listed below: user@domain address Replace user@domain by address. This form has the highest precedence. This is useful to clean up addresses produced by legacy mail systems. It can also be used to pro- duce Firstname.Lastname style addresses, but see below for a simpler solution. user address Replace user@site by address when site is equal to $myorigin, when site is listed in $mydestination, or when it is listed in $inet_interfaces or $proxy_interfaces. This form is useful for replacing login names by Firstname.Lastname. @domain address Replace other addresses in domain by address. This form has the lowest precedence. RESULT ADDRESS REWRITING The lookup result is subject to address rewriting: o When the result has the form @otherdomain, the result becomes the same user in otherdomain. o When "append_at_myorigin=yes", append "@$myorigin" to addresses without "@domain". o When "append_dot_mydomain=yes", append ".$mydomain" to addresses without ".domain". ADDRESS EXTENSION When a mail address localpart contains the optional recip- ient delimiter (e.g., user+foo@domain), the lookup order becomes: user+foo@domain, user@domain, user+foo, user, and @domain. The propagate_unmatched_extensions parameter controls whether an unmatched address extension (+foo) is propa- gated to the result of table lookup. REGULAR EXPRESSION TABLES This section describes how the table lookups change when the table is given in the form of regular expressions. For a description of regular expression lookup table syntax, see regexp_table(5) or pcre_table(5). Each pattern is a regular expression that is applied to the entire address being looked up. Thus, [email protected] mail addresses are not broken up into their user and @domain constituent parts, nor is user+foo broken up into user and foo. Patterns are applied in the order as specified in the ta- ble, until a pattern is found that matches the search string. Results are the same as with indexed file lookups, with the additional feature that parenthesized substrings from the pattern can be interpolated as $1, $2 and so on. TCP-BASED TABLES This section describes how the table lookups change when lookups are directed to a TCP-based server. For a descrip- tion of the TCP client/server lookup protocol, see tcp_ta- ble(5). This feature is not available up to and including Postfix version 2.2. Each lookup operation uses the entire address once. Thus, [email protected] mail addresses are not broken up into their user and @domain constituent parts, nor is user+foo broken up into user and foo. Results are the same as with indexed file lookups. BUGS The table format does not understand quoting conventions. CONFIGURATION PARAMETERS The following main.cf parameters are especially relevant. The text below provides only a parameter summary. See postconf(5) for more details including examples. canonical_classes What addresses are subject to canonical address mapping. canonical_maps List of canonical mapping tables. 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. propagate_unmatched_extensions A list of address rewriting or forwarding mecha- nisms that propagate an address extension from the original address to the result. Specify zero or more of canonical, virtual, alias, forward, include, or generic. Other parameters of interest: inet_interfaces The network interface addresses that this system receives mail on. You need to stop and start Post- fix when this parameter changes. local_header_rewrite_clients Rewrite message header addresses in mail from these clients and update incomplete addresses with the domain name in $myorigin or $mydomain; either don't rewrite message headers from other clients at all, or rewrite message headers and update incomplete addresses with the domain specified in the remote_header_rewrite_domain parameter. proxy_interfaces Other interfaces that this machine receives mail on by way of a proxy agent or network address transla- tor. masquerade_classes List of address classes subject to masquerading: zero or more of envelope_sender, envelope_recipi- ent, header_sender, header_recipient. masquerade_domains List of domains that hide their subdomain struc- ture. masquerade_exceptions List of user names that are not subject to address masquerading. mydestination List of domains that this mail system considers local. myorigin The domain that is appended to locally-posted mail. owner_request_special Give special treatment to owner-xxx and xxx-request addresses. remote_header_rewrite_domain 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. SEE ALSO cleanup(8), canonicalize and enqueue mail postmap(1), Postfix lookup table manager postconf(5), configuration parameters virtual(5), virtual aliasing README FILES DATABASE_README, Postfix lookup table overview ADDRESS_REWRITING_README, address rewriting guide 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 CANONICAL(5)

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