config_directory (see 'postconf -d' output)
The default location of the Postfix main.cf and master.cf configuration files.
daemon_directory (see 'postconf -d' output)
The directory with Postfix support programs and daemon programs.
debugger_command (empty)
The external command to execute when a Postfix daemon program is invoked with the -D option.
inet_interfaces (all)
The network interface addresses that this mail system receives mail on.
inet_protocols (ipv4)
The Internet protocols Postfix will attempt to use when making or accepting connections.
import_environment (see 'postconf -d' output)
The list of environment parameters that a Postfix process will import from a non-Postfix parent process.
mail_owner (postfix)
The UNIX system account that owns the Postfix queue and most Postfix daemon processes.
process_id (read-only)
The process ID of a Postfix command or daemon process.
process_name (read-only)
The process name of a Postfix command or daemon process.
queue_directory (see 'postconf -d' output)
The location of the Postfix top-level queue directory.
syslog_facility (mail)
The syslog facility of Postfix logging.
syslog_name (see 'postconf -d' output)
The mail system name that is prepended to the process name in syslog records, so that "smtpd" becomes, for example, "postfix/smtpd".