This file is indexed.

/etc/amavis/conf.d/05-node_id is in amavisd-new 1:2.11.0-1ubuntu1.

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;

# $myhostname is used by amavisd-new for node identification, and it is
# important to get it right (e.g. for ESMTP EHLO, loop detection, and so on).

chomp($myhostname = `hostname --fqdn`);

# To manually set $myhostname, edit the following line with the correct Fully
# Qualified Domain Name (FQDN) and remove the # at the beginning of the line.
#
#$myhostname = "mail.example.com";

1;  # ensure a defined return