postconf - Postfix configuration utility
postconf [-dhmlnv] [-c config_dir] [parameter ...]
postconf [-ev] [-c config_dir] [parameter=value ...]
The postconf(1) command prints the actual value of parameter (all known
parameters by default) one parameter per line, changes its value, or
prints other information about the Postfix mail system.
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 pro-
tect shell metacharacters and whitespace.
-h Show parameter values only, not the ββname = ββ label that nor-
mally precedes the value.
-l List the names of all supported mailbox locking methods. Post-
fix 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
An application-level locking method. An application locks
a file named filename by creating a file named file-
name.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 syn-
tax depends on the lookup table type as described in the
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 incremen-
tal 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
dbm An indexed file type based on hashing. This is available
on systems with support for DBM databases.
The UNIX process environment array. The lookup key is the
variable name. Originally implemented for testing, some-
one may find this useful someday.
hash An indexed file type based on hashing. This is available
on systems with support for Berkeley DB databases.
Perform lookups using the LDAP protocol. This is
described in ldap_table(5).
Perform lookups using the MYSQL protocol. This is
described in mysql_table(5).
A lookup table based on Perl Compatible Regular Expres-
sions. The file format is described in pcre_table(5).
Perform lookups using the PostgreSQL protocol. This is
described in pgsql_table(5).
A lookup table that is implemented via the Postfix prox-
ymap(8) service. The table name syntax is type:name.
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.
A table that always returns its name as lookup result.
For example, static:foobar always returns the string foo-
bar as lookup result.
Perform lookups using a simple request-reply protocol
that is described in tcp_table(5). This feature is not
included with Postfix 2.2.
A limited way to query the UNIX authentication database.
The following tables are implemented:
The table is the UNIX password database. The key
is a login name. The result is a password file
entry in passwd(5) format.
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.
-v Enable verbose logging for debugging purposes. Multiple -v
options make the software increasingly verbose.
Problems are reported to the standard error stream.
Directory with Postfix configuration files.
The following main.cf parameters are especially relevant to this pro-
The text below provides only a parameter summary. See postconf(5) for
more details including examples.
config_directory (see ββpostconf -dββ output)
The default location of the Postfix main.cf and master.cf con-
/etc/postfix/main.cf, Postfix configuration parameters
postconf(5), configuration parameters
Use "postconf readme_directory" or "postconf html_directory" to locate
DATABASE_README, Postfix lookup table overview
The Secure Mailer license must be distributed with this software.
IBM T.J. Watson Research
P.O. Box 704
Yorktown Heights, NY 10598, USA
Man(1) output converted with