Provided by: postfix_2.2.10-1_i386 bug

NAME

       mysql_table - Postfix MySQL client configuration

SYNOPSIS

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

       postmap -q - mysql:/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 MySQL  databases.   In
       order  to use MySQL lookups, define a MySQL source as a lookup table in
       main.cf, for example:
           alias_maps = mysql:/etc/mysql-aliases.cf

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

BACKWARDS COMPATIBILITY

       For  compatibility  with  other Postfix lookup tables, MySQL parameters
       can also be defined in main.cf.  In order to do that, specify as  MySQL
       source  a  name  that  doesn’t  begin with a slash or a dot.  The MySQL
       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  "mysql:mysqlname",  the  parameter
       "hosts" below would be defined in main.cf as "mysqlname_hosts".

       Note:  with  this form, the passwords for the MySQL sources are written
       in main.cf, 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).  When the  new  query
       parameter  is  not  specified in the map definition, Postfix reverts to
       the  old  interface,  with  the  SQL   query   constructed   from   the
       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_field]
               FROM [table]
               WHERE [where_field] = ’%s’
                   [additional_conditions]

       Insert 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_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.

MYSQL 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. Postfix versions 2.0
              and earlier do not randomize the host order.

              NOTE: if you specify localhost as a hostname (even if you prefix
              it  with  inet:),  MySQL will connect to the default UNIX domain
              socket.  In order to instruct MySQL to connect to localhost over
              TCP you have to specify
                  hosts = 127.0.0.1

       user, password
              The  user  name  and  password  to  log  into  the mysql 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.

              %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 identically to their lower-case
                     counter-parts.  With  the  result_format  parameter  (see
                     below),  they expand the input key rather than the result
                     value.

              %[1-9] The  patterns  %1,  %2,  ...  %9  are  replaced  by   the
                     corresponding  most  significant  component  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 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.

              This  parameter is available with Postfix 2.2. In prior releases
              the  SQL  query  was  built  from   the   separate   parameters:
              select_field,  table, where_field and additional_conditions. The
              mapping from the old parameters to the equivalent query is:

                  SELECT [select_field]
                  FROM [table]
                  WHERE [where_field] = ’%s’
                        [additional_conditions]

              The ’%s’ in the WHERE  clause  expands  to  the  escaped  search
              string.   With  Postfix  2.2 these legacy parameters are used if
              the query parameter is not specified.

              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 concatenated 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 MySQL 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.

       The  following  parameters  can  be  used  to fill in a SELECT template
       statement of the form:

           SELECT [select_field]
           FROM [table]
           WHERE [where_field] = ’%s’
                 [additional_conditions]

       The specifier %s is replaced by 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.

       As of Postfix 2.2 this interface is obsolete, it  is  replaced  by  the
       more  general  query interface described above.  If the query parameter
       is defined, the legacy parameters are ignored. Please  migrate  to  the
       new  interface  as  the  legacy  interface  may  be removed in a future
       release.

       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 maintenance
       postconf(5), configuration parameters
       ldap_table(5), LDAP lookup tables
       pgsql_table(5), PostgreSQL lookup tables

README FILES

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

LICENSE

       The Secure Mailer license must be distributed with this software.

HISTORY

       MySQL support was introduced with Postfix version 1.0.

AUTHOR(S)

       Original implementation by:
       Scott Cotton, Joshua Marcus
       IC Group, Inc.

       Further enhancements by:
       Liviu Daia
       Institute of Mathematics of the Romanian Academy
       P.O. BOX 1-764
       RO-014700 Bucharest, ROMANIA

                                                                MYSQL_TABLE(5)