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PGSQL_TABLE(5) PGSQL_TABLE(5)
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 spec-
ify the parameters described below.
BACKWARDS COMPATIBILITY
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 nor-mally normally
mally world-readable. Support for this form will be removed in a future Postfix version.
Normally, the SQL query is specified via a single query parameter (described in more detail below).
When this parameter is not specified in the map definition, Postfix reverts to an older interface,
with the SQL query constructed from the select_function, select_field, table, where_field and
additional_conditions parameters. The old interface will be gradually phased out. 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'
additional_conditions
Use the value, not the name, of each legacy parameter. Note that the additional_conditions parameter
is optional and if not empty, will always start with AND.
LIST MEMBERSHIP
When using SQL to store lists such as $mynetworks, $mydestination, $relay_domains, $local_recipi-ent_maps, $local_recipient_maps,
ent_maps, etc., it is important to understand that the table must store each list member as a sepa-rate separate
rate 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:port
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
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 metacharacters.
%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 suppressed 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 address. Otherwise, the query is suppressed and returns no
results.
%[SUD] The upper-case equivalents of the above expansions behave in the query parameter iden-tically identically
tically to their lower-case counter-parts. With the result_format parameter (see
below), they expand the input key rather than the result value.
The above %S, %U and %D expansions are available with Postfix 2.2 and later
%[1-9] The patterns %1, %2, ... %9 are replaced by the corresponding most significant compo-nent component
nent of the input key's domain. If the input key is user@mail.example.com, 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 suppressed
and returns no results.
The above %1, ... %9 expansions are available with Postfix 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 prece-dence precedence
dence 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 supports 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 skipped.
%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 skipped.
%[SUD1-9]
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.
For example, using "result_format = smtp:[%s]" allows one to use a mailHost attribute as the
basis of a transport(5) table. After applying the result format, multiple values are concate-nated concatenated
nated as comma separated strings. The expansion_limit and parameter explained below allows one
to restrict the number of values in the result, which is especially useful for maps that must
return at most one value.
The default value %s specifies that each result value should be used as is.
This parameter is available with Postfix 2.2 and later.
NOTE: DO NOT put quotes around the result format!
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 = postfix.org, hash:/etc/postfix/searchdomains
It is best not to use SQL to store the domains eligible for SQL lookups.
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.
OBSOLETE QUERY INTERFACES
This section describes query interfaces that are deprecated as of Postfix 2.2. Please migrate to the
new query interface as the old interfaces are slated to be phased out.
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')
This parameter overrides the legacy table-related fields (described below). With Postfix ver-sions versions
sions 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_function interface described above)
can be used to build the SQL select statement as follows:
SELECT [select_field]
FROM [table]
WHERE [where_field] = '%s'
[additional_conditions]
The specifier %s is replaced with each lookup by the lookup key and is escaped so if it contains sin-gle single
gle quotes or other odd characters, it will not cause a parse error, or worse, a security problem.
Starting with Postfix 2.2, this interface is obsoleted by the more general query interface described
above. If higher precedence the query or select_function parameters described above are defined, the
parameters described here are ignored.
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'
SEE ALSO
postmap(1), Postfix lookup table manager
postconf(5), configuration parameters
ldap_table(5), LDAP lookup tables
mysql_table(5), MySQL lookup tables
sqlite_table(5), SQLite lookup tables
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
PGSQL_TABLE(5)
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