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POSTCONF(1) General Commands Manual POSTCONF(1)
NAME
postconf - Postfix configuration utility
SYNOPSIS
Managing main.cf:
postconf [-dfhHnopvx] [-c config_dir] [-C class,...] [parameter ...]
postconf [-epv] [-c config_dir] parameter=value ...
postconf -# [-pv] [-c config_dir] parameter ...
postconf -X [-pv] [-c config_dir] parameter ...
Managing master.cf service entries:
postconf -M [-fovx] [-c config_dir] [service[/type] ...]
postconf -M [-ev] [-c config_dir] service/type=value ...
postconf -M# [-v] [-c config_dir] service/type ...
postconf -MX [-v] [-c config_dir] service/type ...
Managing master.cf service fields:
postconf -F [-fhHovx] [-c config_dir] [service[/type[/field]] ...]
postconf -F [-ev] [-c config_dir] service/type/field=value ...
Managing master.cf service parameters:
postconf -P [-fhHovx] [-c config_dir] [service[/type[/parameter]] ...]
postconf -P [-ev] [-c config_dir] service/type/parameter=value ...
postconf -PX [-v] [-c config_dir] service/type/parameter ...
Managing bounce message templates:
postconf -b [-v] [-c config_dir] [template_file]
postconf -t [-v] [-c config_dir] [template_file]
Managing TLS features:
postconf -T mode [-v] [-c config_dir]
Managing other configuration:
postconf -a|-A|-l|-m [-v] [-c config_dir]
DESCRIPTION
By default, the postconf(1) command displays the values of main.cf configuration parame-
ters, and warns about possible mis-typed parameter names (Postfix 2.9 and later). The
command can also change main.cf configuration parameter values, or display other configu-
ration information about the Postfix mail system.
Options:
-a List the available SASL plug-in types for the Postfix SMTP server. The 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 sup-
port.
dovecot
This server plug-in uses the Dovecot authentication server, and is available
when Postfix is built with any form of SASL support.
This feature is available with Postfix 2.3 and later.
-A List the available SASL plug-in types for the Postfix SMTP client. The 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 sup-
port.
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 notifica-
tion (DSN) messages, expanding $name expressions with actual values as described in
bounce(5).
To override the bounce_template_file parameter setting, specify a template file
name at the end of the "postconf -b" command line. Specify an empty file name to
display built-in templates (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.
-C class,...
When displaying main.cf parameters, select only parameters from the specified
class(es):
builtin
Parameters with built-in names.
service
Parameters with service-defined names (the first field of a master.cf entry
plus a Postfix-defined suffix).
user Parameters with user-defined names.
all All the above classes.
The default is as if "-C all" is specified.
This feature is available with Postfix 2.9 and later.
-d Print main.cf default parameter settings instead of actual settings. Specify -df
to fold long lines for human readability (Postfix 2.9 and later).
-e Edit the main.cf configuration file, and update parameter settings with the
"name=value" pairs on the postconf(1) command line.
With -M, edit the master.cf configuration file, and replace one or more service en-
tries with new values as specified with "service/type=value" on the postconf(1)
command line.
With -F, edit the master.cf configuration file, and replace one or more service
fields with new values as specified with "service/type/field=value" on the post-
conf(1) command line. Currently, the "command" field contains the command name and
command arguments. this may change in the near future, so that the "command" field
contains only the command name, and a new "arguments" pseudofield contains the com-
mand arguments.
With -P, edit the master.cf configuration file, and add or update one or more ser-
vice parameter settings (-o parameter=value settings) with new values as specified
with "service/type/parameter=value" on the postconf(1) command line.
In all cases the file is copied to a temporary file then renamed into place. Spec-
ify quotes to protect special characters and whitespace on the postconf(1) command
line.
The -e option is no longer needed with Postfix version 2.8 and later.
-f Fold long lines when printing main.cf or master.cf configuration file entries, for
human readability.
This feature is available with Postfix 2.9 and later.
-F Show master.cf per-entry field settings (by default all services and all fields),
formatted as "service/type/field=value", one per line. Specify -Ff to fold long
lines.
Specify one or more "service/type/field" instances on the postconf(1) command line
to limit the output to fields of interest. Trailing parameter name or service type
fields that are omitted will be handled as "*" wildcard fields.
This feature is available with Postfix 2.11 and later.
-h Show parameter or attribute values without the "name = " label that normally pre-
cedes the value.
-H Show parameter or attribute names without the " = value" that normally follows the
name.
This feature is available with Postfix 3.1 and later.
-l List the names of all supported mailbox locking methods. Postfix supports the fol-
lowing 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 file-
name 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 program 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 be-
low. The table name syntax depends on the lookup table type as described in the
DATABASE_README document.
btree A sorted, balanced tree structure. Available on systems with support for
Berkeley DB databases.
cdb A read-optimized structure with no support for incremental updates. Avail-
able on systems with support for CDB databases.
This feature is available with Postfix 2.2 and later.
cidr A table that associates values with Classless Inter-Domain Routing (CIDR)
patterns. This is described in cidr_table(5).
This feature is available with Postfix 2.2 and later.
dbm An indexed file type based on hashing. Available on systems with support
for DBM databases.
environ
The UNIX process environment array. The lookup key is the environment vari-
able name; the table name is ignored. Originally implemented for testing,
someone may find this useful someday.
fail A table that reliably fails all requests. The lookup table name is used for
logging. This table exists to simplify Postfix error tests.
This feature is available with Postfix 2.9 and later.
hash An indexed file type based on hashing. Available on systems with support
for Berkeley DB databases.
inline (read-only)
A non-shared, in-memory lookup table. Example: "inline:{ key=value, { key =
text with whitespace or comma }}". Key-value pairs are separated by white-
space or comma; with a key-value pair inside "{}", whitespace is ignored af-
ter the opening "{", around the "=" between key and value, and before the
closing "}". Inline tables eliminate the need to create a database file for
just a few fixed elements. See also the static: map type.
This feature is available with Postfix 3.0 and later.
internal
A non-shared, in-memory hash table. Its content are lost when a process ter-
minates.
lmdb OpenLDAP LMDB database (a memory-mapped, persistent file). Available on
systems with support for LMDB databases. This is described in lmdb_ta-
ble(5).
This feature is available with Postfix 2.11 and later.
ldap (read-only)
LDAP database client. This is described in ldap_table(5).
memcache
Memcache database client. This is described in memcache_table(5).
This feature is available with Postfix 2.9 and later.
mysql (read-only)
MySQL database client. Available on systems with support for MySQL data-
bases. This is described in mysql_table(5).
pcre (read-only)
A lookup table based on Perl Compatible Regular Expressions. The file for-
mat is described in pcre_table(5).
pgsql (read-only)
PostgreSQL database client. This is described in pgsql_table(5).
This feature is available with Postfix 2.1 and later.
pipemap (read-only)
A lookup table that constructs a pipeline of tables. Example:
"pipemap:{type_1:name_1, ..., type_n:name_n}". Each "pipemap:" query is
given to the first table. Each lookup result becomes the query for the next
table in the pipeline, and the last table produces the final result. When
any table lookup produces no result, the pipeline produces no result. The
first and last characters of the "pipemap:" table name must be "{" and "}".
Within these, individual maps are separated with comma or whitespace.
This feature is available with Postfix 3.0 and later.
proxy Postfix proxymap(8) client for shared access to Postfix databases. The table
name syntax is type:name.
This feature is available with Postfix 2.0 and later.
randmap (read-only)
An in-memory table that performs random selection. Example: "randmap:{re-
sult_1, ..., result_n}". Each table query returns a random choice from the
specified results. The first and last characters of the "randmap:" table
name must be "{" and "}". Within these, individual results are separated
with comma or whitespace. To give a specific result more weight, specify it
multiple times.
This feature is available with Postfix 3.0 and later.
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. Available on systems with support
for SDBM databases.
This feature is available with Postfix 2.2 and later.
socketmap (read-only)
Sendmail-style socketmap client. The table name is inet:host:port:name for a
TCP/IP server, or unix:pathname:name for a UNIX-domain server. This is de-
scribed in socketmap_table(5).
This feature is available with Postfix 2.10 and later.
sqlite (read-only)
SQLite database. This is described in sqlite_table(5).
This feature is available with Postfix 2.8 and later.
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. Specify
"static:{ text with whitespace }" when the result contains whitespace; this
form ignores whitespace after the opening "{" and before the closing "}".
See also the inline: map.
The form "static:{text} is available with Postfix 3.0 and later.
tcp (read-only)
TCP/IP client. The protocol is described in tcp_table(5).
texthash (read-only)
Produces similar results as hash: files, except that you don't need to run
the postmap(1) command before you can use the file, and that it does not de-
tect changes after the file is read.
This feature is available with Postfix 2.8 and later.
unionmap (read-only)
A table that sends each query to multiple lookup tables and that concate-
nates all found results, separated by comma. The table name syntax is the
same as for pipemap.
This feature is available with Postfix 3.0 and later.
unix (read-only)
A limited view of 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.
-M Show master.cf file contents instead of main.cf file contents. Specify -Mf to fold
long lines for human readability.
Specify zero or more arguments, each with a service-name or service-name/ser-
vice-type pair, where service-name is the first field of a master.cf entry and ser-
vice-type is one of (inet, unix, fifo, or pass).
If service-name or service-name/service-type is specified, only the matching mas-
ter.cf entries will be output. For example, "postconf -Mf smtp" will output all
services named "smtp", and "postconf -Mf smtp/inet" will output only the smtp ser-
vice that listens on the network. Trailing service type fields that are omitted
will be handled as "*" wildcard fields.
This feature is available with Postfix 2.9 and later. The syntax was changed from
"name.type" to "name/type", and "*" wildcard support was added with Postfix 2.11.
-n Show only configuration parameters that have explicit name=value settings in
main.cf. Specify -nf to fold long lines for human readability (Postfix 2.9 and
later). To show settings that differ from built-in defaults only, use the following
bash syntax:
comm -23 <(postconf -n) <(postconf -d)
Replace "-23" with "-12" to show settings that duplicate built-in defaults.
-o name=value
Override main.cf parameter settings.
This feature is available with Postfix 2.10 and later.
-p Show main.cf parameter settings. This is the default.
This feature is available with Postfix 2.11 and later.
-P Show master.cf service parameter settings (by default all services and all parame-
ters), formatted as "service/type/parameter=value", one per line. Specify -Pf to
fold long lines.
Specify one or more "service/type/parameter" instances on the postconf(1) command
line to limit the output to parameters of interest. Trailing parameter name or
service type fields that are omitted will be handled as "*" wildcard fields.
This feature is available with Postfix 2.11 and later.
-t [template_file]
Display the templates for text that appears at the beginning of delivery status no-
tification (DSN) messages, without expanding $name expressions.
To override the bounce_template_file parameter setting, specify a template file
name at the end of the "postconf -t" command line. Specify an empty file name to
display built-in templates (in shell language: "").
This feature is available with Postfix 2.3 and later.
-T mode
If Postfix is compiled without TLS support, the -T option produces no output. Oth-
erwise, if an invalid mode is specified, the -T option reports an error and exits
with a non-zero status code. The valid modes are:
compile-version
Output the OpenSSL version that Postfix was compiled with (i.e. the OpenSSL
version in a header file). The output format is the same as with the command
"openssl version".
run-version
Output the OpenSSL version that Postfix is linked with at runtime (i.e. the
OpenSSL version in a shared library).
public-key-algorithms
Output the lower-case names of the supported public-key algorithms, one
per-line.
This feature is available with Postfix 3.1 and later.
-v Enable verbose logging for debugging purposes. Multiple -v options make the soft-
ware increasingly verbose.
-x Expand $name in main.cf or master.cf parameter values. The expansion is recursive.
This feature is available with Postfix 2.10 and later.
-X Edit the main.cf configuration file, and remove the parameters named on the post-
conf(1) command line. Specify a list of parameter names, not "name=value" pairs.
With -M, edit the master.cf configuration file, and remove one or more service en-
tries as specified with "service/type" on the postconf(1) command line.
With -P, edit the master.cf configuration file, and remove one or more service pa-
rameter settings (-o parameter=value settings) as specified with "service/type/pa-
rameter" on the postconf(1) command line.
In all cases the file is copied to a temporary file then renamed into place. Spec-
ify quotes to protect special characters on the postconf(1) command line.
There is no postconf(1) command to perform the reverse operation.
This feature is available with Postfix 2.10 and later. Support for -M and -P was
added with Postfix 2.11.
-# Edit the main.cf configuration file, and comment out the parameters named on the
postconf(1) command line, so that those parameters revert to their default values.
Specify a list of parameter names, not "name=value" pairs.
With -M, edit the master.cf configuration file, and comment out one or more service
entries as specified with "service/type" on the postconf(1) command line.
In all cases the file is copied to a temporary file then renamed into place. Spec-
ify quotes to protect special characters on the postconf(1) command line.
There is no postconf(1) command to perform the reverse operation.
This feature is available with Postfix 2.6 and later. Support for -M was added with
Postfix 2.11.
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 includ-
ing 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.
FILES
/etc/postfix/main.cf, Postfix configuration parameters
/etc/postfix/master.cf, Postfix master daemon configuration
SEE ALSO
bounce(5), bounce template file format
master(5), master.cf configuration file syntax
postconf(5), main.cf configuration file syntax
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
POSTCONF(1)
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On Apache
Under GNU General Public License
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