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GENERIC(5)		      File Formats Manual		    GENERIC(5)

NAME
       generic - Postfix generic table format

SYNOPSIS
       postmap /usr/local/etc/postfix/generic

       postmap -q "string" /usr/local/etc/postfix/generic

       postmap -q - /usr/local/etc/postfix/generic <inputfile

DESCRIPTION
       The optional generic(5) table specifies an address mapping that applies
       when mail is delivered. This is the opposite of	canonical(5)  mapping,
       which applies when mail is received.

       Typically, one would use	the generic(5) table on	a system that does not
       have a valid Internet domain name and that uses something like localdo-
       main.local  instead.   The generic(5) table is then used	by the smtp(8)
       client to transform local mail addresses	into valid Internet  mail  ad-
       dresses	when mail has to be sent across	the Internet.  See the EXAMPLE
       section at the end of this document.

       The generic(5) mapping affects both message header addresses (i.e.  ad-
       dresses	that  appear  inside  messages)	and message envelope addresses
       (for example, the addresses that	are used in SMTP protocol commands).

       Normally, the generic(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 /usr/local/etc/postfix/generic" to	rebuild	an in-
       dexed file after	changing the corresponding 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 expressions,	or lookups can be  di-
       rected  to  TCP-based  server. In those case, the lookups are done in a
       slightly	different way as described below under "REGULAR	EXPRESSION TA-
       BLES" or	"TCP-BASED TABLES".

CASE FOLDING
       The  search string is folded to lowercase before	database lookup. As of
       Postfix 2.3, the	search string is not case folded with  database	 types
       such  as	 regexp: or pcre: whose	lookup fields can match	both upper and
       lower case.

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	corre-
	      sponding 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 logical line.

TABLE SEARCH ORDER
       With  lookups  from  indexed files such as DB or	DBM, or	from networked
       tables such as NIS, LDAP	or SQL,	each user@domain query produces	a  se-
       quence of query patterns	as described below.

       Each query pattern is sent to each specified lookup table before	trying
       the next	query pattern, until a match is	found.

       user@domain address
	      Replace user@domain by address. This form	has the	highest	prece-
	      dence.

       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.

       @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 recipient 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 un-
       matched address extension (+foo)	is propagated 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 ad-
       dress being looked up. Thus, user@domain	mail addresses are not	broken
       up  into	their user and @domain constituent parts, nor is user+foo bro-
       ken up into user	and foo.

       Patterns	are applied in the order as specified in the  table,  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  interpo-
       lated 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  description	 of  the   TCP
       client/server  lookup  protocol,	see tcp_table(5).  This	feature	is not
       available up to and including Postfix version 2.4.

       Each lookup operation uses the entire address once.  Thus,  user@domain
       mail  addresses	are  not  broken  up  into their user and @domain con-
       stituent	parts, nor is user+foo broken up into user and foo.

       Results are the same as with indexed file lookups.

EXAMPLE
       The following shows a generic mapping with an indexed file.  When  mail
       is  sent	to a remote host via SMTP, this	replaces his@localdomain.local
       by his ISP mail address,	replaces her@localdomain.local by her ISP mail
       address,	and replaces other local addresses by his ISP account, with an
       address extension of +local (this example assumes that the ISP supports
       "+" style address extensions).

       /usr/local/etc/postfix/main.cf:
	   smtp_generic_maps = hash:$config_directory/generic

       /usr/local/etc/postfix/generic:
	   his@localdomain.local   hisaccount@hisisp.example
	   her@localdomain.local   heraccount@herisp.example
	   @localdomain.local	   hisaccount+local@hisisp.example

       Execute	the  command "postmap /usr/local/etc/postfix/generic" whenever
       the table is changed.  Instead of hash, some systems use	 dbm  database
       files.  To  find	 out  what tables your system supports use the command
       "postconf -m".

BUGS
       The table format	does not understand quoting conventions.

CONFIGURATION PARAMETERS
       The following main.cf parameters	are especially relevant.  The text be-
       low provides only a parameter summary. See postconf(5) for more details
       including examples.

       smtp_generic_maps
	      Address mapping lookup table for envelope	and header sender  and
	      recipient	addresses while	delivering mail	via SMTP.

       propagate_unmatched_extensions
	      A	list of	address	rewriting or forwarding	mechanisms that	propa-
	      gate an address extension	from the original address to  the  re-
	      sult.   Specify  zero or more of canonical, virtual, alias, for-
	      ward, 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 Postfix when	this parameter
	      changes.

       proxy_interfaces
	      Other interfaces that this machine receives mail on by way of  a
	      proxy agent or network address translator.

       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.

SEE ALSO
       postmap(1), Postfix lookup table	manager
       postconf(5), configuration parameters
       smtp(8),	Postfix	SMTP client

README FILES
       Use  "postconf readme_directory"	or "postconf html_directory" to	locate
       this information.
       ADDRESS_REWRITING_README, address rewriting guide
       DATABASE_README,	Postfix	lookup table overview
       STANDARD_CONFIGURATION_README, configuration examples

LICENSE
       The Secure Mailer license must be distributed with this software.

HISTORY
       A genericstable feature appears in the Sendmail MTA.

       This feature is available in Postfix 2.2	and later.

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

								    GENERIC(5)

NAME | SYNOPSIS | DESCRIPTION | CASE FOLDING | TABLE FORMAT | TABLE SEARCH ORDER | RESULT ADDRESS REWRITING | ADDRESS EXTENSION | REGULAR EXPRESSION TABLES | TCP-BASED TABLES | EXAMPLE | BUGS | CONFIGURATION PARAMETERS | SEE ALSO | README FILES | LICENSE | HISTORY | AUTHOR(S)

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