This file is indexed.

/etc/amavis/conf.d/21-ubuntu_defaults is in amavisd-new 1:2.7.1-2ubuntu3.

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

The actual contents of the file can be viewed below.

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use strict;

#
# These are Ubuntu specific defaults for amavisd-new configuration
#
# DOMAIN KEYS IDENTIFIED MAIL (DKIM)
$enable_dkim_verification = 1;
# Don't be verbose about sending mail:
@whitelist_sender_acl = qw( .$mydomain );
$final_virus_destiny      = D_DISCARD; # (defaults to D_BOUNCE)
$final_banned_destiny     = D_DISCARD;  # (defaults to D_BOUNCE)
$final_spam_destiny       = D_DISCARD;  # (defaults to D_REJECT)
$final_bad_header_destiny = D_PASS;  # (defaults to D_PASS), D_BOUNCE suggested

$virus_admin = undef;
$spam_admin = undef;

#------------ Do not modify anything below this line -------------
1;  # insure a defined return