    POSTMAP(1)                                                          POSTMAP(1)

    NAME
           postmap - Postfix lookup table management

    SYNOPSIS
           postmap [-bfFhijmnNoprsuUvw] [-c config_dir] [-d key] [-q key]
                   [file_type:]file_name ...

    DESCRIPTION
           The  postmap(1)  command  creates or queries one or more Postfix lookup
           tables, or updates an existing one.

           If the result files do not exist they will be  created  with  the  same
           group and other read permissions as their source file.

           While  the  table  update is in progress, signal delivery is postponed,
           and an exclusive, advisory, lock is placed  on  the  entire  table,  in
           order to avoid surprises in spectator processes.

    INPUT FILE FORMAT
           The format of a lookup table input file is as follows:

           o      A table entry has the form

                       key whitespace value

           o      Empty  lines and whitespace-only lines are ignored, as are lines
                  whose first non-whitespace character is a `#'.

           o      A logical line starts with  non-whitespace  text.  A  line  that
                  starts with whitespace continues a logical line.

           The  key  and  value are processed as is, except that surrounding white
           space is stripped off. Whitespace in lookup keys is supported in  Post-
           fix  3.2 and later, by surrounding the key with double quote characters
           `"'. Within the double quotes, double quote `"' and backslash `\' char-
           acters can be included by quoting them with a preceding backslash.

           When  the  -F option is given, the value must specify one or more file-
           names separated by comma and/or whitespace; postmap(1) will concatenate
           the  file content (with a newline character inserted between files) and
           will store the base64-encoded result instead of the value.

           When the key specifies email address information, the localpart  should
           be enclosed with double quotes if required by RFC 5322. For example, an
           address localpart that contains ";", or a localpart that starts or ends
           with ".".

           By  default  the  lookup key is mapped to lowercase to make the lookups
           case insensitive; as of Postfix 2.3 this case folding happens only with
           tables whose lookup keys are fixed-case strings such as btree:, dbm: or
           hash:. With earlier versions, the lookup key is folded even with tables
           where  a lookup field can match both upper and lower case text, such as
           regexp: and pcre:. This resulted in loss of  information  with  $number
           substitutions.

    COMMAND-LINE ARGUMENTS
           -b     Enable  message  body  query mode. When reading lookup keys from
                  standard input with "-q -", process the input as  if  it  is  an
                  email  message  in  RFC  5322 format.  Each line of body content
                  becomes one lookup key.

                  By default, the -b option starts generating lookup keys  at  the
                  first  non-header line, and stops when the end of the message is
                  reached.  To simulate  body_checks(5)  processing,  enable  MIME
                  parsing   with  -m.  With  this,  the  -b  option  generates  no
                  body-style lookup keys  for  attachment  MIME  headers  and  for
                  attached message/* headers.

                  NOTE: with "smtputf8_enable = yes", the -b option disables UTF-8
                  syntax checks on query keys and lookup results. Specify  the  -U
                  option to force UTF-8 syntax checks anyway.

                  This feature is available in Postfix version 2.6 and later.

           -c config_dir
                  Read  the  main.cf  configuration  file  in  the named directory
                  instead of the default configuration directory.

           -d key Search the specified maps for key and remove one entry per  map.
                  The  exit  status  is  zero  when  the requested information was
                  found.

                  If a key value of - is specified, the program reads  key  values
                  from  the standard input stream. The exit status is zero when at
                  least one of the requested keys was found.

           -f     Do not fold the lookup key  to  lower  case  while  creating  or
                  querying a table.

                  With  Postfix  version  2.3 and later, this option has no effect
                  for regular expression tables. There, case folding is controlled
                  by appending a flag to a pattern.

           -F     When querying a map, or listing a map, base64-decode each value.
                  When creating a map from source file, process each  value  as  a
                  list  of  filenames, concatenate the content of those files, and
                  store the base64-encoded result instead of the value (see  INPUT
                  FILE FORMAT for details).

                  This feature is available in Postfix version 3.4 and later.

           -h     Enable  message header query mode. When reading lookup keys from
                  standard input with "-q -", process the input as  if  it  is  an
                  email  message  in  RFC  5322  format.  Each logical header line
                  becomes one lookup key. A multi-line header becomes  one  lookup
                  key with one or more embedded newline characters.

                  By  default, the -h option generates lookup keys until the first
                  non-header line is reached.  To simulate  header_checks(5)  pro-
                  cessing,  enable  MIME parsing with -m. With this, the -h option
                  also generates header-style  lookup  keys  for  attachment  MIME
                  headers and for attached message/* headers.

                  NOTE:  with  "smtputf8_enable  = yes", the -h option option dis-
                  ables UTF-8 syntax checks on  query  keys  and  lookup  results.
                  Specify the -U option to force UTF-8 syntax checks anyway.

                  This feature is available in Postfix version 2.6 and later.

           -i     Incremental  mode.  Read  entries from standard input and do not
                  truncate an existing database. By default, postmap(1) creates  a
                  new database from the entries in file_name.

           -j     JSON  output.  Format  the  output from -q and -s as one {"key":
                  "value"} object per line.

                  This feature is available in Postfix version 3.11 and later.

           -m     Enable MIME parsing with "-b" and "-h".

                  This feature is available in Postfix version 2.6 and later.

           -N     Include the terminating null character  that  terminates  lookup
                  keys  and  values.  By  default, postmap(1) does whatever is the
                  default for the host operating system.

           -n     Don't include the terminating  null  character  that  terminates
                  lookup  keys and values. By default, postmap(1) does whatever is
                  the default for the host operating system.

           -o     Do not release root privileges when processing a non-root  input
                  file.  By  default, postmap(1) drops root privileges and runs as
                  the source file owner instead.

           -p     Do not inherit the file access permissions from the  input  file
                  when  creating  a  new  file.   Instead,  create a new file with
                  default access permissions (mode 0644).

           -q key Search the specified maps for key  and  write  the  first  value
                  found  to  the  standard  output stream. The exit status is zero
                  when the requested information was found.

                  Note: this performs a single query with the  key  as  specified,
                  and  does  not make iterative queries with substrings of the key
                  as described for  access(5),  canonical(5),  transport(5),  vir-
                  tual(5) and other Postfix table-driven features.

                  If  a  key value of - is specified, the program reads key values
                  from the standard input stream and writes one line of key  value
                  output for each key that was found. The exit status is zero when
                  at least one of the requested keys was found.

           -r     When updating a table, do not complain about attempts to  update
                  existing entries, and make those updates anyway.

           -s     Retrieve  all database elements, and write one line of key value
                  output for each element. The elements are  printed  in  database
                  order,  which  is not necessarily the same as the original input
                  order.

                  This feature is available in Postfix version 2.2 and later,  and
                  is not available for all database types.

           -u     Disable  UTF-8 support. UTF-8 support is enabled by default when
                  "smtputf8_enable = yes". It requires that keys  and  values  are
                  valid UTF-8 strings.

           -U     With "smtputf8_enable = yes", force UTF-8 syntax checks with the
                  -b and -h options.

           -v     Enable verbose  logging  for  debugging  purposes.  Multiple  -v
                  options make the software increasingly verbose.

           -w     When  updating a table, do not complain about attempts to update
                  existing entries, and ignore those attempts.

           Arguments:

           file_type
                  The database type. To find out what types are supported, use the
                  "postconf -m" command.

                  When  no  file_type is specified, the software uses the database
                  type  specified  via  the  default_database_type   configuration
                  parameter.   The default value for this parameter depends on the
                  host environment.

                  The postmap(1) command can query any supported file type, but it
                  can create only the following file types:

                  btree  The  output  file  is  a  btree file, named file_name.db.
                         This is available on systems with support  for  db  data-
                         bases.

                  cdb    The  output  consists  of  one file, named file_name.cdb.
                         This is available on systems with support for  cdb  data-
                         bases.

                  dbm    The output consists of two files, named file_name.pag and
                         file_name.dir.  This is available on systems with support
                         for dbm databases.

                  fail   A  table that reliably fails all requests. The lookup ta-
                         ble name is used for logging only. This table  exists  to
                         simplify Postfix error tests.

                  hash   The  output  file  is  a hashed file, named file_name.db.
                         This is available on systems with support  for  db  data-
                         bases.

                  lmdb   The  output  is a btree-based file, named file_name.lmdb.
                         lmdb supports concurrent writes and reads from  different
                         processes,  unlike  other  supported  file-based  tables.
                         This is available on systems with support for lmdb  data-
                         bases.

                  sdbm   The output consists of two files, named file_name.pag and
                         file_name.dir.  This is available on systems with support
                         for sdbm databases.

           file_name
                  The name of the lookup table source file when rebuilding a data-
                  base.

    DIAGNOSTICS
           Problems are logged to the standard error stream and to  syslogd(8)  or
           postlogd(8).  No output means that no problems were detected. Duplicate
           entries are skipped and are flagged with a warning.

           postmap(1) terminates with zero exit status in case of success (includ-
           ing  successful  "postmap -q" lookup) and terminates with non-zero exit
           status in case of failure.

    ENVIRONMENT
           MAIL_CONFIG
                  Directory with Postfix configuration files.

           MAIL_VERBOSE
                  Enable verbose logging for debugging purposes.

    CONFIGURATION PARAMETERS
           The following main.cf parameters are especially relevant to  this  pro-
           gram.   The  text  below  provides  only a parameter summary. See post-
           conf(5) for more details including examples.

           berkeley_db_create_buffer_size (16777216)
                  The per-table I/O buffer size for programs that create  Berkeley
                  DB hash or btree tables.

           berkeley_db_read_buffer_size (131072)
                  The per-table I/O buffer size for programs that read Berkeley DB
                  hash or btree tables.

           config_directory (see 'postconf -d' output)
                  The default location of the Postfix main.cf and  master.cf  con-
                  figuration files.

           default_database_type (see 'postconf -d' output)
                  The default database type for use in newaliases(1), postalias(1)
                  and postmap(1) commands.

           import_environment (see 'postconf -d' output)
                  The list of environment  variables  that  a  privileged  Postfix
                  process  will  import  from  a  non-Postfix  parent  process, or
                  name=value environment overrides.

           smtputf8_enable (yes)
                  Enable preliminary SMTPUTF8 support for the protocols  described
                  in RFC 6531, RFC 6532, and RFC 6533.

           syslog_facility (mail)
                  The syslog facility of Postfix logging.

           syslog_name (see 'postconf -d' output)
                  A  prefix  that  is  prepended  to  the  process  name in syslog
                  records, so that, for example, "smtpd" becomes "prefix/smtpd".

           Available in Postfix 2.11 and later:

           lmdb_map_size (16777216)
                  The initial OpenLDAP LMDB database size limit in bytes.

    SEE ALSO
           postalias(1), create/update/query alias database
           postconf(1), supported database types
           postconf(5), configuration parameters
           postlogd(8), Postfix logging
           syslogd(8), system logging

    README FILES
           DATABASE_README, Postfix lookup table overview

    LICENSE
           The Secure Mailer license must be distributed with this software.

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

           Wietse Venema
           Google, Inc.
           111 8th Avenue
           New York, NY 10011, USA

                                                                        POSTMAP(1)