[Exim] configure file problem, please help

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I have the following content in my configure file, which I use mysql
database to lookup information about users, and writing incoming mails
using the maildir. There is no error messages when using exim -bd -d,
but there is no mail delivery. Please tell me if something is missing,
or am I doing anything wrong. Thank you!

/usr/exim/configure
hide mysql_servers = localhost/maildb/mail/123456
domainlist local_domains = @ : ${lookup mysql {SELECT userid FROM
domains \
    WHERE userid="${quote_mysql:${domain}}" }}
domainlist relay_to_domains =
hostlist   relay_from_hosts = 127.0.0.1
acl_smtp_rcpt = acl_check_rcpt
never_users = root
host_lookup = *
rfc1413_hosts = *
rfc1413_query_timeout = 30s
ignore_bounce_errors_after = 2d
timeout_frozen_after = 7d

begin acl

acl_check_rcpt:
  accept  hosts = :
  deny    local_parts   = ^.*[@%!/|] : ^\\.
  accept  local_parts   = postmaster
          domains       = +local_domains
  require verify        = sender
  accept  domains       = +local_domains
          endpass
          message       = unknown user
          verify        = recipient
  accept  domains       = +relay_to_domains
          endpass
          message       = unrouteable address
          verify        = recipient
  accept  hosts         = +relay_from_hosts
  accept  authenticated = *
  deny    message       = relay not permitted

begin routers

dnslookup:
driver = dnslookup
domains = ! +local_domains
transport = remote_smtp
ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8
no_more

system_aliases:
driver = redirect
allow_fail
allow_defer
data = ${lookup{$local_part}lsearch{/etc/aliases}}
file_transport = address_file
pipe_transport = address_pipe
condition = ${if {eq{$domain}{$primary_hostname}} {yes}{no}}

localuser:
driver = accept
check_local_user
transport = local_delivery
condition = ${if eq {$domain}{$primary_hostname} {yes}{no} }

virtual_user:
  driver = redirect
  allow_fail
  allow_defer
  data = ${lookup mysql{ SELECT maildir FROM users \
          WHERE id='${quote_mysql:${local_part}@${domain}}' }}
  directory_transport = address_directory

begin transports

remote_smtp:
driver = smtp

local_delivery:
driver = appendfile
file = /var/mail/$local_part
delivery_date_add
envelope_to_add
return_path_add

address_pipe:
driver = pipe
return_output

address_file:
driver = appendfile
delivery_date_add
envelope_to_add
return_path_add

address_directory:
driver = appendfile
maildir_format
delivery_date_add
envelope_to_add
return_path_add


address_reply:
driver = autoreply
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