This file is indexed.

/etc/exim4/conf.d/router/500_exim4-config_hubuser is in exim4-config 4.76-3ubuntu3.4.

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

The actual contents of the file can be viewed below.

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### router/500_exim4-config_hubuser
#################################

.ifdef DCconfig_satellite
# This router is only used for configtype=satellite.
# It takes care to route all mail targetted to <somelocaluser@this.machine>
# to the host where we read our mail
#
hub_user:
  debug_print = "R: hub_user for $local_part@$domain"
  driver = redirect
  domains = +local_domains
  data = ${local_part}@DCreadhost
  check_local_user

# Grab the redirected mail and deliver it.
# This is a duplicate of the smarthost router, needed because
# DCreadhost might end up as part of +local_domains
hub_user_smarthost:
  debug_print = "R: hub_user_smarthost for $local_part@$domain"
  driver = manualroute
  domains = DCreadhost
  transport = remote_smtp_smarthost
  route_list = * DCsmarthost byname
  host_find_failed = defer
  same_domain_copy_routing = yes
  check_local_user
.endif