This file is indexed.

/etc/courier/smtpaccess/default is in courier-mta 0.68.2-1ubuntu3.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# Copyright 1998 - 2011 Double Precision, Inc.  See COPYING for
# distribution information.
#
# Default access policies for courieresmtpd
#
# By default, enable relaying for localhost.

127.0.0.1	allow,RELAYCLIENT
:0000:0000:0000:0000:0000:0000:0000:0001	allow,RELAYCLIENT

# Also, enable relaying for 10.0.0.0/8 and 192.168.0.0/16

10	allow,RELAYCLIENT
192.168	allow,RELAYCLIENT

# Use the following entry to deny connections from bad IP addresses
#
# 192.168.5	deny

# Another way to block mail from IP addresses is by initializing the
# BLOCK variable to a non-empty value.  This is enforced in submit.
#
# 192.168.5	allow,BLOCK="550 Shoo! Go away!"

# If 192.168.2.3 is listed in a blocklist that initializes the BLOCK
# environment variable, and you wish to whitelist the IP address, just
# set BLOCK to an empty value, like this:
#
# 192.168.2.3	allow,BLOCK