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           postmap -q "string" pgsql:/etc/postfix/filename
           postmap -q - pgsql:/etc/postfix/filename <inputfile


           The  Postfix  mail system uses optional tables for address rewriting or
           mail routing. These tables are usually in dbm or db format.
           Alternatively, lookup tables can be specified as PostgreSQL  databases.
           In  order  to  use  PostgreSQL lookups, define a PostgreSQL source as a
           lookup table in, for example:
               alias_maps = pgsql:/etc/
           The file /etc/postfix/ has the same format as the Post-
           fix file, and can specify the parameters described below.


           For  compatibility with other Postfix lookup tables, PostgreSQL parame-
           ters can also be defined in  In order to do that,  specify  as
           PostgreSQL source a name that doesn't begin with a slash or a dot.  The
           PostgreSQL parameters will then be accessible as the name you've  given
           the source in its definition, an underscore, and the name of the param-
           eter.  For example, if the map is specified as  "pgsql:pgsqlname",  the
           parameter  "hosts"  below  would  be  defined  in  as  "pgsql-
           Note: with this form, the passwords  for  the  PostgreSQL  sources  are
           written in, which is normally world-readable.  Support for this
           form will be removed in a future Postfix version.
           Postfix 2.2 has enhanced query interfaces  for  MySQL  and  PostgreSQL,
           these  include  features  previously available only in the Postfix LDAP
           client. In the new interface the SQL query is specified  via  a  single
           query  parameter  (described in more detail below).  In Postfix 2.1 the
           parameter precedence was,  from  highest  to  lowest,  select_function,
           query and finally select_field, ...
           With  Postfix  2.2  the  query parameter has highest precedence, and is
           used in preference to the still supported, but slated to be phased out,
           select_function, select_field, table, where_field and additional_condi-
           tions parameters. To migrate to the new interface set:
               query = SELECT select_function('%s')
           or in the absence of select_function, the lower precedence:
               query = SELECT select_field
                   FROM table
                   WHERE where_field = '%s'
           DO create tables with each matching item as a key and with an arbitrary
           value.  With  SQL databases it is not uncommon to return the key itself
           or a constant value.


           hosts  The hosts that Postfix will try to connect to  and  query  from.
                  Specify unix: for UNIX-domain sockets, inet: for TCP connections
                  (default).  Example:
                      hosts = host1.some.domain host2.some.domain
                      hosts = unix:/file/name
                  The hosts are tried in random order, with all  connections  over
                  UNIX domain sockets being tried before those over TCP.  The con-
                  nections are automatically closed after being idle for  about  1
                  minute, and are re-opened as necessary.
                  NOTE:  the  unix:  and inet: prefixes are accepted for backwards
                  compatibility reasons, but are actually ignored.  The PostgreSQL
                  client  library  will always try to connect to an UNIX socket if
                  the name starts with a slash, and will try a TCP connection oth-
           user, password
                  The  user name and password to log into the pgsql server.  Exam-
                      user = someone
                      password = some_password
           dbname The database name on the servers. Example:
                      dbname = customer_database
           query  The SQL query template used to search the database, where %s  is
                  a  substitute for the address Postfix is trying to resolve, e.g.
                      query = SELECT replacement FROM aliases WHERE mailbox = '%s'
                  This parameter supports the following '%' expansions:
                  %%     This is replaced by a literal '%' character. (Postfix 2.2
                         and later)
                  %s     This  is  replaced by the input key.  SQL quoting is used
                         to make sure that the input key does not  add  unexpected
                  %u     When the input key is an address of the form user@domain,
                         %u is replaced by  the  SQL  quoted  local  part  of  the
                         address.   Otherwise, %u is replaced by the entire search
                         string.  If the localpart is empty,  the  query  is  sup-
                         pressed and returns no results.
                  %d     When the input key is an address of the form user@domain,
                         %d is replaced by the  SQL  quoted  domain  part  of  the
                         domain.  If  the input key is, then
                         %1 is com, %2 is example and %3 is mail. If the input key
                         is  unqualified or does not have enough domain components
                         to satisfy all the specified patterns, the query is  sup-
                         pressed and returns no results.
                         The  above %1, ... %9 expansions are available with Post-
                         fix 2.2 and later
                  The domain parameter described below limits the  input  keys  to
                  addresses in matching domains. When the domain parameter is non-
                  empty, SQL queries for unqualified  addresses  or  addresses  in
                  non-matching domains are suppressed and return no results.
                  The  precedence  of this parameter has changed with Postfix 2.2,
                  in prior releases the precedence was, from  highest  to  lowest,
                  select_function, query, select_field, ...
                  With Postfix 2.2 the query parameter has highest precedence, see
                  COMPATIBILITY above.
                  NOTE: DO NOT put quotes around the query parameter.
           result_format (default: %s)
                  Format template applied to result attributes. Most commonly used
                  to  append  (or prepend) text to the result. This parameter sup-
                  ports the following '%' expansions:
                  %%     This is replaced by a literal '%' character.
                  %s     This is replaced by the value of  the  result  attribute.
                         When result is empty it is skipped.
                  %u     When the result attribute value is an address of the form
                         user@domain, %u is replaced by  the  local  part  of  the
                         address.  When  the  result  has an empty localpart it is
                  %d     When a result attribute value is an address of  the  form
                         user@domain,  %d  is  replaced  by the domain part of the
                         attribute value. When the result  is  unqualified  it  is
                         The  upper-case  and decimal digit expansions interpolate
                         the parts of the input key rather than the result.  Their
                         behavior  is  identical to that described with query, and
                         in fact because  the  input  key  is  known  in  advance,
                         queries  whose  key  does not contain all the information
                         specified in  the  result  template  are  suppressed  and
                         return no results.
           domain (default: no domain list)
                  This is a list of domain names, paths to files, or dictionaries.
                  When  specified,  only  fully qualified search keys with a *non-
                  empty* localpart and a matching domain are eligible for  lookup:
                  'user'  lookups,  bare  domain lookups and "@domain" lookups are
                  not performed. This can significantly reduce the query  load  on
                  the PostgreSQL server.
                      domain =, hash:/etc/postfix/searchdomains
                  It  is best not to use SQL to store the domains eligible for SQL
                  This parameter is available with Postfix 2.2 and later.
                  NOTE: DO NOT define this parameter for local(8) aliases, because
                  the input keys are always unqualified.
           expansion_limit (default: 0)
                  A  limit  on  the total number of result elements returned (as a
                  comma separated list) by a lookup against the map.  A setting of
                  zero  disables the limit. Lookups fail with a temporary error if
                  the limit is exceeded.  Setting the  limit  to  1  ensures  that
                  lookups do not return multiple values.


           This section describes query interfaces that are deprecated as of Post-
           fix 2.2.  Please migrate to the new query interface as the  old  inter-
           faces are slated to be phased out.
                  This parameter specifies a database function name. Example:
                      select_function = my_lookup_user_alias
                  This is equivalent to:
                      query = SELECT my_lookup_user_alias('%s')
                  This   parameter   overrides  the  legacy  table-related  fields
                  (described below). With Postfix versions prior to 2.2,  it  also
                  overrides  the  query  parameter. Starting with Postfix 2.2, the
                  query parameter has highest precedence, and the  select_function
                  parameter is deprecated.
           The  following  parameters (with lower precedence than the select_func-
           tion interface described above) can be used to  build  the  SQL  select
           statement as follows:
               SELECT [select_field]
               FROM [table]
               WHERE [where_field] = '%s'
                      table = mxaliases
                  The SQL "select .. where" parameter. Example:
                      where_field = alias
                  Additional conditions to the SQL query. Example:
                      additional_conditions = AND status = 'paid'


           postmap(1), Postfix lookup table manager
           postconf(5), configuration parameters
           ldap_table(5), LDAP lookup tables
           mysql_table(5), MySQL lookup tables


           Use "postconf readme_directory" or "postconf html_directory" to  locate
           this information.
           DATABASE_README, Postfix lookup table overview
           PGSQL_README, Postfix PostgreSQL client guide


           The Secure Mailer license must be distributed with this software.


           PgSQL support was introduced with Postfix version 2.1.


           Based on the MySQL client by:
           Scott Cotton, Joshua Marcus
           IC Group, Inc.
           Ported to PostgreSQL by:
           Aaron Sethman
           Further enhanced by:
           Liviu Daia
           Institute of Mathematics of the Romanian Academy
           P.O. BOX 1-764
           RO-014700 Bucharest, ROMANIA

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