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 methods:
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 creating 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_table(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_table(5).
This feature is not included with Postfix 2.2.
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 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 increasingly 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 examples.
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.
