postconf (1)

Contents

NAME
SYNOPSIS
DESCRIPTION
DIAGNOSTICS
ENVIRONMENT
CONFIGURATION PARAMETERS
FILES
SEE ALSO
README FILES
LICENSE
AUTHOR(S)

NAME

postconf - Postfix configuration utility

SYNOPSIS



Managing main.cf:


postconf [-dfhnopvx] [-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 [-fovx] [-c config_dir]
[service[/type[/field]] ...]


postconf -F [-ev] [-c config_dir]
service/type/field=value ...


Managing master.cf service parameters:


postconf -P [-fovx] [-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 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 parameters, and warns
about possible mis-typed parameter names (Postfix 2.9 and later).
It can also change main.cf configuration
parameter values, or display 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 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 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, replacing
$name expressions with actual values as described in
bounce(5).


To override the built-in templates, specify a template file
name at the end of the postconf(1) command line, or
specify a file name in main.cf with the
bounce_template_file parameter.


To force selection of the built-in templates, specify an
empty template file name on the postconf(1) command
line (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.

-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 entries 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
specied with "service/type/field=value" on the
postconf(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 command arguments.


With -P, edit the master.cf configuration file,
and add or update one or more service parameter settings
(-o parameter=value settings) with new values as specied
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.  Specify 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 one
"service/type/field=value" 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 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 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 below. 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.  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.  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.

fail

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

hash

An indexed file type based on hashing.  Available on systems
with support for Berkeley DB databases.

internal

A non-shared, in-memory hash table. Its content are lost
when a process terminates.

lmdb

OpenLDAP LMDB database (a memory-mapped, persistent file).
Available on systems with support for LMDB databases.  This
is described in lmdb_table(5).

ldap (read-only)

LDAP database client. This is described in ldap_table(5).

memcache

Memcache database client. This is described in
memcache_table(5).

mysql (read-only)

MySQL database client.  Available on systems with support
for MySQL databases.  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)

PostgreSQL database client. This is described in
pgsql_table(5).

proxy

Postfix proxymap(8) client for shared access to Postfix
databases. 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.  Available on systems
with support for SDBM databases.

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 described in socketmap_table(5).

sqlite (read-only)

SQLite database. This is described in sqlite_table(5).

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)

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 detect changes after
the file is read.

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/service-type pair, where service-name
is the first field of a master.cf entry and service-type
is one of (inet, unix, fifo, or pass).


If service-name or service-name/service-type
is specified, only the matching master.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 service 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).

-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.

-P

Show master.cf service parameter settings (by default
all services and all parameters).  formatted as one
"service/type/parameter=value" 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 notification (DSN) messages, without
expanding $name expressions.


To override the built-in templates, specify a template file
name at the end of the postconf(1) command line, or
specify a file name in main.cf with the
bounce_template_file parameter.


To force selection of the built-in templates, specify an
empty template file name on the postconf(1) command
line (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.

-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 postconf(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 entries 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 parameter settings (-o
parameter=value settings) as specied with
"service/type/parameter" on the postconf(1)
command line.


In all cases the file is copied to a temporary file then
renamed into place.  Specify 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.  Specify 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 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.




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