SMTP авторизация в exim, с использованием системных пользователей. Столкнулся с такой проблемой, что эта авторизация является как бы "не обязательной". Она вроде как бы и есть, но отправить можно и без нее...

вот пример конфига:
######################################################################
#                    MAIN CONFIGURATION SETTINGS                     #
######################################################################

primary_hostname = test.local

domainlist local_domains = test.local
domainlist relay_to_domains =
hostlist relay_from_hosts = localhost

acl_smtp_rcpt = acl_check_rcpt

INTERNAL_IP = 192.168.0.70

daemon_smtp_ports = 25

qualify_domain = test.local
allow_domain_literals = true

exim_user = mail
exim_group = exim

never_users = root

host_lookup = *
rfc1413_query_timeout = 0s
sender_unqualified_hosts = +relay_from_hosts
recipient_unqualified_hosts = +relay_from_hosts
ignore_bounce_errors_after = 2d
timeout_frozen_after = 7d

auth_advertise_hosts = *
smtp_accept_max = 200
smtp_accept_max_per_connection = 25
smtp_connect_backlog = 30
smtp_accept_max_per_host = 10
split_spool_directory = false
remote_max_parallel = 15
return_size_limit = 70k
message_size_limit = 50M

helo_allow_chars = _
smtp_enforce_sync = true

log_selector = \
    +all_parents \
    +connection_reject \
    +incoming_interface \
    +lost_incoming_connection \
    +received_sender \
    +received_recipients \
    +smtp_confirmation \
    +smtp_syntax_error \
    +smtp_protocol_error \
    -queue_run
syslog_timestamp = no

######################################################################
#                       ACL CONFIGURATION                            #
#         Specifies access control lists for incoming SMTP mail      #
######################################################################

begin acl
acl_check_rcpt:
  accept  hosts = :
  deny    message       = Restricted characters in address
          domains       = +local_domains
          local_parts   = ^[.] : ^.*[@%!/|]
  deny    message       = Restricted characters in address
          domains       = !+local_domains
          local_parts   = ^[./|] : ^.*[@%!] : ^.*/\\.\\./
  accept  local_parts   = postmaster
          domains       = +local_domains
  accept  hosts         = +relay_from_hosts
          control       = submission
  accept  authenticated = *
          control       = submission
  require message = relay not permitted
          domains = +local_domains : +relay_to_domains
  require verify = recipient
  #Рубим тех, кто не обменивается приветственными сообщениями (HELO/EHLO)
  deny    message       = "HELO/EHLO require by SMTP RFC"
          condition     = ${if eq{$sender_helo_name}{}{yes}{no}}
  #Рубим тех, кто подставляет свой IP в HELO
  deny    message       = "Your IP in HELO - access denied!"
          hosts         =  * : !+relay_from_hosts
          condition     = ${if eq{$sender_helo_name}\
                    {$sender_host_address}{true}{false}}
  #Рубим тех, кто в HELO пихает мой IP
  deny    condition     = ${if eq{$sender_helo_name}\
                           {$interface_address}{yes}{no}}
          hosts         = !127.0.0.1 : !localhost : *
          message       = "main IP in your HELO! Access denied!"
  # Рубим хосты типа *adsl*; *dialup*; *pool*;....
  deny    message       = "your hostname is bad (adsl, ppp & etc)."
  condition     = ${if match{$sender_host_name} \
                   {adsl|dialup|peer|dhcp} \
                   {yes}{no}}
# Задержка.
warn
     # ставим дефолтовую задержку в 30 секунд
     set acl_m0 = 30s
  warn
     # ставим задержку в 0 секунд своим хостам и дружественным сетям
     hosts = +relay_from_hosts
     set acl_m0 = 0s
  warn
     # пишем в логи задержку
     logwrite = Delay $acl_m0 for $sender_host_name \
                [$sender_host_address] with HELO=$sender_helo_name. Mail \
                from $sender_address to $local_part@$domain.
                delay = $acl_m0

  # Проверка получателя в локальных доменах.
  accept  domains       = +local_domains
          endpass
          message       = "In my mailserver not stored this user"
          verify        = recipient
     logwrite = Accept $sender_host_name (local_domains)
# Проверяем получателя в релейных доменах
accept  domains       = +relay_to_domains
          endpass
          message       = "main server not know how relay to this address"
          verify        = recipient
     logwrite = Accept $sender_host_name (local_domains)

# Рубим тех, кто в блэк-листах. Серваки перебираются сверху вниз.
deny    message       = "you in blacklist - $dnslist_domain --> $dnslist_text"
          dnslists      = sbl-xbl.spamhaus.org : \
                          bl.spamcop.net : \
                          dul.ru : \
                          dul.dnsbl.sorbs.net : \
                          opm.blitzed.org : \
                          cbl.abuseat.org : \
                          bl.csma.biz : \
                          cbl.abuseat.org

# Разрешаем почту от доменов в списке relay_from_hosts
  accept  hosts         = +relay_from_hosts
  logwrite = Accept $sender_host_name (relay_from_hosts)

# Если неподошло ни одно правило.
deny    message       = "relay not permitted"
deny

######################################################################
#                      ROUTERS CONFIGURATION                         #
#               Specifies how addresses are handled                  #
######################################################################
#     THE ORDER IN WHICH THE ROUTERS ARE DEFINED IS IMPORTANT!       #
# An address is passed to each router in turn until it is accepted.  #
######################################################################

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}}
  user = exim
  file_transport = address_file
  pipe_transport = address_pipe

userforward:
  driver = redirect
  check_local_user
  file = $home/.forward
  allow_filter
  no_verify
  no_expn
  check_ancestor
  file_transport = address_file
  pipe_transport = address_pipe
  reply_transport = address_reply

procmail:
  driver = accept
  check_local_user
  require_files = ${local_part}:+${home}/.procmailrc:/usr/bin/procmail
  transport = procmail
  no_verify

localuser:
  driver = accept
  check_local_user
  transport = procmail
  cannot_route_message = Unknown user

######################################################################
#                      TRANSPORTS CONFIGURATION                      #
######################################################################
#                       ORDER DOES NOT MATTER                        #
#     Only one appropriate transport is called for each delivery.    #
######################################################################
begin transports

remote_smtp:
  driver = smtp

procmail:
  driver = pipe
  command = "/usr/bin/procmail -d $local_part"
  return_path_add
  delivery_date_add
  envelope_to_add
  user = $local_part
  group = mail
  initgroups
  return_output

local_delivery:
  driver = appendfile
  file = /var/mail/${local_part}
  delivery_date_add
  envelope_to_add
  return_path_add
  group = mail
  mode = 0660
  no_mode_fail_narrower

address_pipe:
  driver = pipe
  return_output

address_file:
  driver = appendfile
  delivery_date_add
  envelope_to_add
  return_path_add

address_reply:
  driver = autoreply

######################################################################
#                      RETRY CONFIGURATION                           #
######################################################################

begin retry

# Address or Domain    Error       Retries
# -----------------    -----       -------

*                      *           F,2h,15m; G,16h,1h,1.5; F,4d,6h

######################################################################
#                      REWRITE CONFIGURATION                         #
######################################################################
# There are no rewriting specifications in this default configuration file.

begin rewrite

######################################################################
#                   AUTHENTICATION CONFIGURATION                     #
######################################################################

LOGIN:
    driver = plaintext
    public_name = LOGIN
    server_prompts = "Username:: : Password::"
    server_condition = "${if pam {$auth1:$auth2}{yes}{no}}"
    server_set_id = $auth1

PLAIN:
    driver = plaintext
    public_name = PLAIN
    server_condition = "${if pam {$auth2:$auth3}{yes}{no}}"
    server_set_id = $auth2

Мож кто сталкивался с этим?