postconf

Use alternate config directory

$ postconf -c [path/to/config_dir]

$ postconf -e

$ postconf -d

$ postconf -C [builtin|service|user|all]

$ postconf -a

$ postconf -m

postconf [-c dir] [-d] [-e] [-C class] [parameters...]

postconf displays and modifies Postfix mail server configuration. It reads and writes main.cf parameters, shows default values, and reports configuration warnings.
The tool validates parameter names and warns about typos. It's essential for administering Postfix without manually editing configuration files.

-c _directory_

Alternate configuration directory

Show default parameter values

Edit main.cf with name=value pairs

Filter by parameter class

List available SASL plugin types

List available lookup table types

Show only parameters with non-default values

Changes via -e require postfix reload to take effect. Some parameters require restart. Modifying running server config requires care. Backup configuration before major changes.

postconf is part of Postfix, the mail transfer agent created by Wietse Venema as a secure alternative to Sendmail. It provides safe configuration management for the complex mail system.

postfix(1), postqueue(1), postmap(1)