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Editing File: /etc/exim4/conf.d/router/200_exim4-config_primary

### router/200_exim4-config_primary
#################################
# This file holds the primary router, responsible for nonlocal mails

.ifdef DCconfig_internet
# configtype=internet
#
# deliver mail to the recipient if recipient domain is a domain we
# relay for. We do not ignore any target hosts here since delivering to
# a site local or even a link local address might be wanted here, and if
# such an address has found its way into the MX record of such a domain,
# the local admin is probably in a place where that broken MX record
# could be fixed.

dnslookup_relay_to_domains:
  debug_print = "R: dnslookup_relay_to_domains for $local_part@$domain"
  driver = dnslookup
  domains = ! +local_domains : +relay_to_domains
  transport = remote_smtp
  same_domain_copy_routing = yes
  no_more

# ignore private rfc1918, loopback, APIPA/link-local, local broadcast, unspecified, unique local, linked-scoped unicast and discard-Only
.ifndef ROUTER_DNSLOOKUP_IGNORE_TARGET_HOSTS
ROUTER_DNSLOOKUP_IGNORE_TARGET_HOSTS = <; 0.0.0.0 ; 127.0.0.0/8 ; 192.168.0.0/16 ; 172.16.0.0/12 ; 10.0.0.0/8 ; 169.254.0.0/16 ; 255.255.255.255 ; ::/128 ; ::1/128 ; fc00::/7 ; fe80::/10 ; 100::/64
.endif

# deliver mail directly to the recipient. This router is only reached
# for domains that we do not relay for. Since we most probably can't
# have broken MX records pointing to site local or link local IP
# addresses fixed, we ignore target hosts pointing to these addresses.

dnslookup:
  debug_print = "R: dnslookup for $local_part@$domain"
  driver = dnslookup
  domains = ! +local_domains
  transport = remote_smtp
  same_domain_copy_routing = yes
  ignore_target_hosts = ROUTER_DNSLOOKUP_IGNORE_TARGET_HOSTS
  no_more

.endif

.ifdef DCconfig_local
# configtype=local
#
# Stand-alone system, so generate an error for mail to a non-local domain
nonlocal:
  debug_print = "R: nonlocal for $local_part@$domain"
  driver = redirect
  domains = ! +local_domains
  allow_fail
  data = :fail: Mailing to remote domains not supported
  no_more

.endif

.ifdef DCconfig_smarthost DCconfig_satellite
# configtype=smarthost or configtype=satellite
#
# Send all non-local mail to a single other machine (smarthost).
#
# This means _ALL_ non-local mail goes to the smarthost. This will most
# probably not do what you want for domains that are listed in
# relay_domains. The most typical use for relay_domains is to control
# relaying for incoming e-mail on secondary MX hosts. In that case,
# it doesn't make sense to send the mail to the smarthost since the
# smarthost will probably send the message right back here, causing a
# loop.
#
# If you want to use a smarthost while being secondary MX for some
# domains, you'll need to copy the dnslookup_relay_to_domains router
# here so that mail to relay_domains is handled separately.

smarthost:
  debug_print = "R: smarthost for $local_part@$domain"
  driver = manualroute
  domains = ! +local_domains
  transport = remote_smtp_smarthost
  route_list = * DCsmarthost byname
  host_find_failed = ignore
  same_domain_copy_routing = yes
  no_more

.endif

# The "no_more" above means that all later routers are for
# domains in the local_domains list, i.e. just like Exim 3 directors.

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