This file is indexed.

/etc/amavis/conf.d/05-domain_id is in amavisd-new 1:2.10.1-4.

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;

# $mydomain is used just for convenience in the config files and it is not
# used internally by amavisd-new except in the default X_HEADER_LINE (which
# Debian overrides by default anyway).

chomp($mydomain = `head -n 1 /etc/mailname`);

# amavisd-new needs to know which email domains are to be considered local
# to the administrative domain.  Only emails to "local" domains are subject
# to certain functionality, such as the addition of spam tags.
#
# Default local domains to $mydomain and all subdomains.  Remember to
# override or redefine this if $mydomain is changed later in the config
# sequence.

@local_domains_acl = ( ".$mydomain" );

1;  # ensure a defined return