/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.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | ### 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
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