Attempt to restore the use of configuration defaults for journals and publishers
whilst still allowing them to be absent.
1# Local delivery to Cyrus: 2#local@$MAIL_DOMAIN lmtp:unix:/var/run/cyrus/socket/lmtp 3# Local delivery to Dovecot: 4#local@$MAIL_DOMAIN lmtp:unix:/var/run/dovecot/lmtp