POSTCONF(1) POSTCONF(1)
NAME
postconf - Postfix configuration utility
SYNOPSIS
postconf [-dhnv] [-c config_dir] [parameter ...]
postconf [-aAmlv] [-c config_dir]
postconf [-ev] [-c config_dir] [parameter=value ...]
postconf [-btv] [-c config_dir] [template_file]
DESCRIPTION
The postconf(1) command displays the actual values of configuration parameters, changes configuration
parameter values, or displays other configuration information about the Postfix mail system.
Options:
-a List the available SASL server plug-in types. The SASL plug-in type is selected with the
smtpd_sasl_type configuration parameter by specifying one of the names listed below.
cyrus This server plug-in is available when Postfix is built with Cyrus SASL support.
dovecot
This server plug-in requires the Dovecot authentication server.
This feature is available with Postfix 2.3 and later.
-A List the available SASL client plug-in types. The SASL plug-in type is selected with the
smtp_sasl_type or lmtp_sasl_type configuration parameters by specifying one of the names
listed below.
cyrus This client plug-in is available when Postfix is built with Cyrus SASL support.
This feature is available with Postfix 2.3 and later.
-b [template_file]
Display the message text that appears at the beginning of delivery status notification (DSN)
messages, with $name expressions replaced by actual values. To override the built-in message
text, specify a template file at the end of the command line, or specify a template file in
main.cf with the bounce_template_file parameter. To force selection of the built-in message
text templates, specify an empty template file name (in shell language: "").
This feature is available with Postfix 2.3 and later.
-c config_dir
The main.cf configuration file is in the named directory instead of the default configuration
directory.
-d Print default parameter settings instead of actual settings.
-e Edit the main.cf configuration file. The file is copied to a temporary file then renamed into
place. Parameters and values are specified on the command line. Use quotes in order to protect
shell metacharacters and whitespace.
-h Show parameter values only, not the ``name = '' label that normally precedes the value.
-l List the names of all supported mailbox locking methods. Postfix supports the following meth-ods: methods:
ods:
flock A kernel-based advisory locking method for local files only. This locking method is
available on systems with a BSD compatible library.
fcntl A kernel-based advisory locking method for local and remote files.
dotlock
An application-level locking method. An application locks a file named filename by cre-ating creating
ating a file named filename.lock. The application is expected to remove its own lock
file, as well as stale lock files that were left behind after abnormal termination.
-m List the names of all supported lookup table types. In Postfix configuration files, lookup
tables are specified as type:name, where type is one of the types listed below. The table name
syntax depends on the lookup table type as described in the DATABASE_README document.
btree A sorted, balanced tree structure. This is available on systems with support for
Berkeley DB databases.
cdb A read-optimized structure with no support for incremental updates. This is available
on systems with support for CDB databases.
cidr A table that associates values with Classless Inter-Domain Routing (CIDR) patterns.
This is described in cidr_table(5).
dbm An indexed file type based on hashing. This is available on systems with support for
DBM databases.
environ
The UNIX process environment array. The lookup key is the variable name. Originally
implemented for testing, someone may find this useful someday.
hash An indexed file type based on hashing. This is available on systems with support for
Berkeley DB databases.
ldap (read-only)
Perform lookups using the LDAP protocol. This is described in ldap_table(5).
mysql (read-only)
Perform lookups using the MYSQL protocol. This is described in mysql_table(5).
pcre (read-only)
A lookup table based on Perl Compatible Regular Expressions. The file format is
described in pcre_table(5).
pgsql (read-only)
Perform lookups using the PostgreSQL protocol. This is described in pgsql_table(5).
proxy (read-only)
A lookup table that is implemented via the Postfix proxymap(8) service. The table name
syntax is type:name.
regexp (read-only)
A lookup table based on regular expressions. The file format is described in regexp_ta-ble(5). regexp_table(5).
ble(5).
sdbm An indexed file type based on hashing. This is available on systems with support for
SDBM databases.
static (read-only)
A table that always returns its name as lookup result. For example, static:foobar
always returns the string foobar as lookup result.
tcp (read-only)
Perform lookups using a simple request-reply protocol that is described in tcp_ta-ble(5). tcp_table(5).
ble(5). This feature is not included with the stable Postfix release.
unix (read-only)
A limited way to query the UNIX authentication database. The following tables are
implemented:
unix:passwd.byname
The table is the UNIX password database. The key is a login name. The result is
a password file entry in passwd(5) format.
unix:group.byname
The table is the UNIX group database. The key is a group name. The result is a
group file entry in group(5) format.
Other table types may exist depending on how Postfix was built.
-n Print parameter settings that are not left at their built-in default value, because they are
explicitly specified in main.cf.
-t [template_file]
Display the templates for delivery status notification (DSN) messages. To override the built-in builtin
in templates, specify a template file at the end of the command line, or specify a template
file in main.cf with the bounce_template_file parameter. To force selection of the built-in
templates, specify an empty template file name (in shell language: "").
This feature is available with Postfix 2.3 and later.
-v Enable verbose logging for debugging purposes. Multiple -v options make the software increas-ingly increasingly
ingly verbose.
DIAGNOSTICS
Problems are reported to the standard error stream.
ENVIRONMENT
MAIL_CONFIG
Directory with Postfix configuration files.
CONFIGURATION PARAMETERS
The following main.cf parameters are especially relevant to this program.
The text below provides only a parameter summary. See postconf(5) for more details including exam-ples. examples.
ples.
config_directory (see 'postconf -d' output)
The default location of the Postfix main.cf and master.cf configuration files.
bounce_template_file (empty)
Pathname of a configuration file with bounce message templates.
FILES
/etc/postfix/main.cf, Postfix configuration parameters
SEE ALSO
bounce(5), bounce template file format
postconf(5), configuration parameters
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
POSTCONF(1)
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