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Linux 2.6 - man page for generic (linux section 5)

GENERIC(5)									       GENERIC(5)

       generic - Postfix generic table format

       postmap /etc/postfix/generic

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

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

       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

       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	localdomain.local  instead.   The
       generic(5) table is then used by the smtp(8) client to transform local mail addresses into
       valid Internet mail addresses when mail has to be sent across the Internet.  See the EXAM-
       PLE section at the end of this document.

       The  generic(5)	mapping affects both message header addresses (i.e. addresses 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 /etc/postfix/generic" to
       rebuild an indexed 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 directed to  TCP-based  server.	In  those
       case,  the  lookups are done in a slightly different way as described below under "REGULAR

       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.

       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 logical line.

       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.

       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.

       The lookup result is subject to address rewriting:

       o      When the result has the form @otherdomain, the result becomes the same user in oth-

       o      When "append_at_myorigin=yes", append "@$myorigin" to addresses without "@domain".

       o      When "append_dot_mydomain=yes", append ".$mydomain" to addresses without ".domain".

       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 unmatched address exten-
       sion (+foo) is propagated to the result of table lookup.

       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 reg-
       exp_table(5) or pcre_table(5).

       Each pattern is a regular expression that is applied to the entire  address  being  looked
       up.  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.

       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 paren-
       thesized substrings from the pattern can be interpolated as $1, $2 and so on.

       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_ta-
       ble(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 constituent parts, nor is user+foo broken up
       into user and foo.

       Results are the same as with indexed file lookups.

       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 sup-
       ports "+" style address extensions).

	   smtp_generic_maps = hash:/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 /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".

       The table format does not understand quoting conventions.

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

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

	      A list of address rewriting or forwarding  mechanisms  that  propagate  an  address
	      extension from the original address to the result.  Specify zero or more of canoni-
	      cal, virtual, alias, forward, include, or generic.

       Other parameters of interest:

	      The network interface addresses that this system receives mail  on.   You  need  to
	      stop and start Postfix when this parameter changes.

	      Other interfaces that this machine receives mail on by way of a proxy agent or net-
	      work address translator.

	      List of domains that this mail system considers local.

	      The domain that is appended to locally-posted mail.

	      Give special treatment to owner-xxx and xxx-request addresses.

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

       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

       The Secure Mailer license must be distributed with this software.

       A genericstable feature appears in the Sendmail MTA.

       This feature is available in Postfix 2.2 and later.

       Wietse Venema
       IBM T.J. Watson Research
       P.O. Box 704
       Yorktown Heights, NY 10598, USA


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