postconf - Displaying and modifying Postfix configuration parameters

The postconf program enables you to modify the values of the Postfix configuration parameters or have them displayed on the screen. This applies both for parameters which are set specifically in the configuration file /etc/postfix/main.cf and for those preset by default.

postconf

[ -d] [-n ] [-e ]

No parameter specified

Shows all currently valid parameter values.

-d

Shows all default parameter values.

-n

Shows all currently valid parameter values which differ from the associated default
value.

-e

Sets Postfix configuration parameters.
The -e option makes sense above all for automatic setting of parameters via a shell script. Otherwise you can also process the configuration file /etc/postfix/main.cf with any editor (e.g. EDT).