The following
main.cf parameters are especially relevant to this program. The text below provides only a parameter summary. See postconf(5) for more details including examples.config_directory (see 'postconf -d' output)
The default location of the Postfix main.cf and master.cf configuration files.
hash_queue_depth (1)
The number of subdirectory levels for queue directories listed with the hash_queue_names parameter.
hash_queue_names (deferred, defer)
The names of queue directories that are split across multiple subdirectory levels.
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".