PGSQL_TABLE

NAME

pgsql_table - Postfix PostgreSQL client configuration

SYNOPSIS

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

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

DESCRIPTION

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 main.cf, for example:
alias_maps = pgsql:/etc/pgsql-aliases.cf

The file /etc/postfix/pgsql-aliases.cf has the same format as the Postfix main.cf file, and can specify the parameters described below.

ALTERNATIVE CONFIGURATION

For compatibility with other Postfix lookup tables, PostgreSQL parameters can also be defined in main.cf. 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 parameter. For example, if the map is specified as "pgsql:pgsqlname", the parameter "hosts" below would be defined in main.cf as "pgsqlname_hosts".

Note: with this form, the passwords for the PostgreSQL sources are written in main.cf, which is normally world-readable. Support for this form will be removed in a future Postfix version.

LIST MEMBERSHIP

When using SQL to store lists such as $mynetworks, $mydestination, $relay_domains, $local_recipient_maps, etc., it is important to understand that the table must store each list member as a separate key. The table lookup verifies the *existence* of the key. See "Postfix lists versus tables" in the DATABASE_README document for a discussion.

Do NOT create tables that return the full list of domains in $mydestination or $relay_domains etc., or IP addresses in $mynetworks.

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.

PGSQL PARAMETERS

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 connections 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 otherwise.

user, password

The user name and password to log into the pgsql server. Example: user = someone
password = some_password

dbname

The database name on the servers. Example:
dbname = customer_database

The following parameters can be used to fill in a SELECT template statement of the form:
select [select_field] from [table] where
[where_field] = '$lookup' [additional_conditions]

$lookup contains the search string, and is escaped so if it contains single quotes or other odd characters, it will not cause a parse error, or worse, a security problem.

select_field: The SQL "select" parameter. Example:
select_field = forw_addr
table: The SQL "select .. from" table name. Example:
table = mxaliases
where_field: The SQL "select .. where" parameter. Example:
where_field = alias
additional_conditions: Additional conditions to the SQL query. Example:
additional_conditions = and status = 'paid'

The following parameters provide ways to override the default SELECT statement. Setting them will instruct Postfix to ignore the above table, select_field, where_field and additional_conditions parameters:

query

This parameter specifies a complete SQL query. Example:
query = select forw_addr from mxaliases where
alias = '%s' and status = 'paid'

This parameter supports the following '%' expansions:

%s: This is replaced by the input key. Quoting is used to make sure that the input key does not add unexpected metacharacters.
%u: When the input key is an address of the form user@domain, %u is replaced by the quoted local part of the address. If no domain is specified, %u is replaced by the entire search string.
%d: When the input key is an address of the form user@domain, %d is replaced by the quoted domain part of the address. When the input key has no domain qualifier, %d is replaced by the entire search string.

select_function

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')

and overrides both the query parameter and the table-related fields above.

As of June 2002, if the function returns a single row and a single column AND that value is NULL, then the result will be treated as if the key was not in the dictionary.

Future versions will allow functions to return result sets.

README FILES

Use "postconf readme_directory" or "postconf html_directory" to locate this information.

DATABASE_README, Postfix lookup table overview
PGSQL_README, Postfix PostgreSQL client guide

LICENSE

The Secure Mailer license must be distributed with this software.

HISTORY

PgSQL support was introduced with Postfix version 2.1.

AUTHOR(S)

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