diff --git a/etc/exim4/exim4.conf b/etc/exim4/exim4.conf
index b2946bb..6479699 100644
--- a/etc/exim4/exim4.conf
+++ b/etc/exim4/exim4.conf
@@ -8,13 +8,12 @@ keep_environment =
 add_environment = PATH=/usr/sbin:/usr/bin:/sbin:/bin
 smtp_enforce_sync = false
 bounce_message_file = /etc/exim4/bounce_message_text
-
-.include /etc/exim4/exim_local.conf
-
 smtp_accept_max = 50
 smtp_accept_max_per_host = 10
 smtp_accept_queue_per_connection = 50
 
+.include /etc/exim4/exim_local.conf
+
 tls_advertise_hosts = *
 tls_certificate = ${if exists{/etc/ssl/letsencrypt/${sg{${tls_sni}}{^smtp\.}{mail.}}.pem}{/etc/ssl/letsencrypt/${sg{${tls_sni}}{^smtp\.}{mail.}}.pem}}
 
@@ -520,7 +519,7 @@ acl_rcpt_to:
   # not responding, accept the recipient anyway.
   #
   deny
-    message = unknown user
+    message = Unknown user
     domains = +local_domains
     !domains = +relay_to_domains
     !verify = recipient/callout=no_cache,10s,defer_ok
@@ -697,8 +696,6 @@ acl_data:
   accept
 
 
-
-
 ######################################################################
 #                      ROUTERS CONFIGURATION                         #
 #               Specifies how addresses are handled                  #
@@ -762,6 +759,7 @@ srs_forward:
 
 dnslookup:
   driver = dnslookup
+  domains = ! +local_domains
   self = pass
   transport = remote_smtp
   ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8
@@ -966,7 +964,6 @@ system_aliases:
 #  file_transport = address_file
 #  pipe_transport = address_pipe
 
-
 # This router handles forwarding using traditional .forward files in users'
 # home directories. If you want it also to allow mail filtering when a forward
 # file starts with the string "# Exim filter", uncomment the "allow_filter"
@@ -998,7 +995,6 @@ userforward:
   pipe_transport = address_pipe
   reply_transport = address_reply
 
-
 # This router matches local user mailboxes.
 
 #localuser:
@@ -1006,7 +1002,15 @@ userforward:
 #  check_local_user
 #  transport = local_delivery
 
-
+# This is a clone of the lmtp_localuser, repeated here (last) to trigger "Unknown user".
+lmtp_unknown_user:
+  driver = accept
+  domains = +local_domains
+  local_part_suffix = +*
+  local_part_suffix_optional = true
+  condition = ${lookup mysql{SELECT vm_mboxes.id FROM vm_mboxes WHERE vm_mboxes.mbox='${quote_mysql:$local_part}' AND vm_mboxes.domain='${quote_mysql:$domain}' AND vm_mboxes.status > '0'}}
+  transport = dovecot_lmtp
+  cannot_route_message = Unknown user
 
 ######################################################################
 #                      TRANSPORTS CONFIGURATION                      #