postconf

Postfix configuration utility.

TLDR

Specify the directory of the main.cf configuration file instead of the default configuration directory

$ postconf -c [path/to/configuration_directory]

Edit the main.cf configuration file and update parameter settings with the "name=value" pairs

$ postconf -e

Print the default parameter settings of the main.cf instead of the actual settings

$ postconf -d

Display parameters only from the specified class. The class can be one of builtin, service, user or all

$ postconf -C [class]

List 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 cyrus or dovecot as the name

$ postconf -a

List the names of all supported lookup table types. Lookup tables are specified as type:name in configuration files where the type can be btree, cdb, hash, mysql, etc

$ postconf -m