postmap Man page

POSTMAP(1) General Commands Manual POSTMAP(1)

NAME

postmap – Postfix lookup table management

SYNOPSIS

postmap [-NAbfhimnoprsuUvw] [-c config_dir] [-d key] [-q key] [file_type:]file_name …

DESCRIPTION

The postmap command creates or queries one or more Postfix lookup
tables, or updates an existing one. The input and output file formats
are expected to be compatible with:

makemap file_type file_name < file_name 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: · A table entry has the form key whitespace value · Empty lines and whitespace-only lines are ignored, as are lines whose first non-whitespace character is a `#'. · 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. Unlike with Postfix alias databases, quotes can‐ not be used to protect lookup keys that contain special characters such as `#' or whitespace. 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 2822 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 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.

-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.

-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 2822 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 -b 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.

-A Upgrade the database to the current version.

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

-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 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 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 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.

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.

The postmap 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.

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

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.

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.

When no file_type is specified, the software uses the database
type specified via the default_database_type configuration
parameter.

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). No
output means that no problems were detected. Duplicate entries are
skipped and are flagged with a warning.

postmap 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, postalias
and postmap commands.

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

syslog_facility (mail)
The syslog facility of Postfix logging.

syslog_name (see ‘postconf -d’ output)
The mail system name that is prepended to the process name in
syslog records, so that “smtpd” becomes, for example, “post‐
fix/smtpd”.

SEE ALSO

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

README FILES
Use “postconf readme_directory” or “postconf html_directory” to locate
this information.
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)

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