Вот, на всякий случай выкидываю деволтовый конфиг, который использую:

######################################################################
#                    MAIN CONFIGURATION SETTINGS                     #
######################################################################
# primary_hostname =
domainlist local_domains = @
domainlist relay_to_domains =
hostlist   relay_from_hosts = 127.0.0.1
# domainlist relay_to_domains = *.myco.com : my.friend.org
# hostlist relay_from_hosts = 127.0.0.1 : 192.168.0.0/16
acl_smtp_rcpt = acl_check_rcpt
acl_smtp_data = acl_check_data
# av_scanner = clamd:/tmp/clamd
# spamd_address = 127.0.0.1 783
# tls_advertise_hosts = *
# tls_certificate = /etc/ssl/exim.crt
# tls_privatekey = /etc/ssl/exim.pem
# daemon_smtp_ports = 25 : 465 : 587
# tls_on_connect_ports = 465
# qualify_domain =
# qualify_recipient =
# allow_domain_literals

exim_user=mailnull
exim_group=mail
never_users = root

host_lookup = *
rfc1413_hosts = *
rfc1413_query_timeout = 5s
# sender_unqualified_hosts =
# recipient_unqualified_hosts =
# percent_hack_domains =
ignore_bounce_errors_after = 2d
timeout_frozen_after = 7d
# split_spool_directory = true
######################################################################
#                       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

  require verify        = sender

  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
  accept
acl_check_data:
  accept
######################################################################
#                      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

# domain_literal:
#   driver = ipliteral
#   domains = ! +local_domains
#   transport = remote_smtp
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
# local_part_suffix = +* : -*
# local_part_suffix_optional
  file = $home/.forward
# allow_filter
  no_verify
  no_expn
  check_ancestor
  file_transport = address_file
  pipe_transport = address_pipe
  reply_transport = address_reply

localuser:
  driver = accept
  check_local_user
# local_part_suffix = +* : -*

# local_part_suffix_optional
  transport = local_delivery
  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
local_delivery:
  driver = appendfile
  file = /var/mail/$local_part
  delivery_date_add
envelope_to_add
  return_path_add
group = mail
mode = 0660
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
*                      *           F,2h,15m; G,16h,1h,1.5; F,4d,6h
begin rewrite
######################################################################
#                   AUTHENTICATION CONFIGURATION                     #
######################################################################
begin authenticators
#PLAIN:
#  driver                     = plaintext
#  server_set_id              = $auth2
#  server_prompts             = :
#  server_condition           = Authentication is not yet configured
#  server_advertise_condition = ${if def:tls_cipher }
#LOGIN:
#  driver                     = plaintext
#  server_set_id              = $auth1
#  server_prompts             = <| Username: | Password:
#  server_condition           = Authentication is not yet configured
#  server_advertise_condition = ${if def:tls_cipher }
######################################################################
#                   CONFIGURATION FOR local_scan()                   #
######################################################################
# begin local_scan