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✏️ Editing: exim.conf.dist

#!!# cPanel Exim 4 Config

@CONFIG@

#!!# These options specify the Access Control Lists (ACLs) that
#!!# are used for incoming SMTP messages - after the RCPT and DATA
#!!# commands, respectively.

acl_smtp_rcpt = check_recipient
acl_smtp_data = check_message

#!!# This setting defines a named domain list called
#!!# local_domains, created from the old options that
#!!# referred to local domains. It will be referenced
#!!# later on by the syntax "+local_domains".
#!!# Other domain and host lists may follow.

domainlist local_domains = lsearch;/etc/localdomains

domainlist relay_domains = lsearch;/etc/localdomains : \
    lsearch;/etc/secondarymx
hostlist relay_hosts = lsearch;/etc/relayhosts : \
    localhost
hostlist auth_relay_hosts = *

######################################################################
#                  Runtime configuration file for Exim               #
######################################################################

# This is a default configuration file which will operate correctly in
# uncomplicated installations. Please see the manual for a complete list
# of all the runtime configuration options that can be included in a
# configuration file. There are many more than are mentioned here. The
# manual is in the file doc/spec.txt in the Exim distribution as a plain
# ASCII file. Other formats (PostScript, Texinfo, HTML) are available from
# the Exim ftp sites. The manual is also online via the Exim web sites.

# This file is divided into several parts, all but the last of which are
# terminated by a line containing the word "end". The parts must appear
# in the correct order, and all must be present (even if some of them are
# in fact empty). Blank lines, and lines starting with # are ignored.

######################################################################
#                    MAIN CONFIGURATION SETTINGS                     #
######################################################################

perl_startup = do '/etc/exim.pl'

#dns_retry = 1
#dns_retrans = 1s

# Specify your host's canonical name here. This should normally be the fully
# qualified "official" name of your host. If this option is not set, the
# uname() function is called to obtain the name.

smtp_banner = "${primary_hostname} ESMTP Exim ${version_number} \
\#${compile_number} ${tod_full} \n\
  We do not authorize the use of this system to transport unsolicited, \n\
  and/or bulk e-mail."

#nobody as the sender seems to annoy people
untrusted_set_sender = *
local_from_check = false

rfc1413_query_timeout = 2s

split_spool_directory = yes

smtp_connect_backlog = 50
smtp_accept_max = 100

# primary_hostname =
deliver_queue_load_max = 3
auto_thaw = 6d
ignore_bounce_errors_after = 7d
timeout_frozen_after = 8d

# Specify the domain you want to be added to all unqualified addresses
# here. An unqualified address is one that does not contain an "@" character
# followed by a domain. For example, "caesar@rome.ex" is a fully qualified
# address, but the string "caesar" (i.e. just a login name) is an unqualified
# email address. Unqualified addresses are accepted only from local callers by
# default. See the receiver_unqualified_{hosts,nets} options if you want
# to permit unqualified addresses from remote sources. If this option is
# not set, the primary_hostname value is used for qualification.

# qualify_domain =

# If you want unqualified recipient addresses to be qualified with a different
# domain to unqualified sender addresses, specify the recipient domain here.
# If this option is not set, the qualify_domain value is used.

# qualify_recipient =

# Specify your local domains as a colon-separated list here. If this option
# is not set (i.e. not mentioned in the configuration file), the
# qualify_recipient value is used as the only local domain. If you do not want
# to do any local deliveries, uncomment the following line, but do not supply
# any data for it. This sets local_domains to an empty string, which is not
# the same as not mentioning it at all. An empty string specifies that there
# are no local domains; not setting it at all causes the default value (the
# setting of qualify_recipient) to be used.

#!!# message_filter renamed system_filter
system_filter = /etc/antivirus.exim
message_body_visible = 5000

# If you want to accept mail addressed to your host's literal IP address, for
# example, mail addressed to "user@[111.111.111.111]", then uncomment the
# following line, or supply the literal domain(s) as part of "local_domains"
# above.

# local_domains_include_host_literals

# No local deliveries will ever be run under the uids of these users (a colon-
# separated list). An attempt to do so gets changed so that it runs under the
# uid of "nobody" instead. This is a paranoic safety catch. Note the default
# setting means you cannot deliver mail addressed to root as if it were a
# normal user. This isn't usually a problem, as most sites have an alias for
# root that redirects such mail to a human administrator.

never_users = root

# The use of your host as a mail relay by any host, including the local host
# calling its own SMTP port, is locked out by default. If you want to permit
# relaying from the local host, you should set
#
# host_accept_relay = localhost
#
# If you want to permit relaying through your host from certain hosts or IP
# networks, you need to set the option appropriately, for example
#
#
#
# If you are an MX backup or gateway of some kind for some domains, you must
# set relay_domains to match those domains. This will allow any host to
# relay through your host to those domains.
#
# See the section of the manual entitled "Control of relaying" for more
# information.

# The setting below causes Exim to do a reverse DNS lookup on all incoming
# IP calls, in order to get the true host name. If you feel this is too
# expensive, you can specify the networks for which a lookup is done, or
# remove the setting entirely.

#host_lookup = 0.0.0.0/0

# By default, Exim expects all envelope addresses to be fully qualified, that
# is, they must contain both a local part and a domain. If you want to accept
# unqualified addresses (just a local part) from certain hosts, you can specify
# these hosts by setting one or both of
#
# receiver_unqualified_hosts =
# sender_unqualified_hosts =
#
# to control sender and receiver addresses, respectively. When this is done,
# unqualified addresses are qualified using the settings of qualify_domain
# and/or qualify_recipient (see above).

# Exim contains support for the Realtime Blocking List (RBL) that is being
# maintained as part of the DNS. See http://maps.vix.com/rbl/ for background.
# Uncommenting the first line below will make Exim reject mail from any
# host whose IP address is blacklisted in the RBL at maps.vix.com. Some
# others have followed the RBL lead and have produced other lists: DUL is
# a list of dial-up addresses, and ORBS is a list of open relay systems. The
# second line below checks all three lists.

# rbl_domains = rbl.maps.vix.com
# rbl_domains = rbl.maps.vix.com

# If you want Exim to support the "percent hack" for all your local domains,
# uncomment the following line. This is the feature by which mail addressed
# to x%y@z (where z is one of your local domains) is locally rerouted to
# x@y and sent on. Otherwise x%y is treated as an ordinary local part.

# percent_hack_domains = *

#sender_host_accept = +include_unknown:*
#sender_host_reject = +include_unknown:lsearch*;/etc/spammers

tls_certificate = /etc/exim.crt
tls_privatekey = /etc/exim.key
tls_advertise_hosts = *

helo_accept_junk_hosts = *

smtp_enforce_sync = false

#!!#######################################################!!#
#!!# This new section of the configuration contains ACLs #!!#
#!!# (Access Control Lists) derived from the Exim 3      #!!#
#!!# policy control options.                             #!!#
#!!#######################################################!!#

#!!# These ACLs are crudely constructed from Exim 3 options.
#!!# They are almost certainly not optimal. You should study
#!!# them and rewrite as necessary.

begin acl

@BEGINACL@
%BEGINACLBLOCK%

#!!# ACL that is used after the RCPT command
check_recipient:
  # Exim 3 had no checking on -bs messages, so for compatibility
  # we accept if the source is local SMTP (i.e. not over TCP/IP).
  # We do this by testing for an empty sending host field.
  accept  hosts = :

#if it gets here it isn't mailman
                                                                                                                                           
  #sender verifications are required for all messages that are not sent to lists
                                                                                                                                           
  require verify = sender/callout
  accept  domains = +local_domains
  endpass
                                                                                                                                           
  #recipient verifications are required for all messages that are not sent to the local machine
  #this was done at multiple users requests
                                                                                                                                           
  message = "The recipient cannot be verified.  Please check all recipients of this message to verify they are valid."
  verify = recipient
                                                                                                                                           
  accept  domains = +relay_domains

warn  message = ${perl{popbeforesmtpwarn}{$sender_host_name}}
        hosts = +relay_hosts
  accept  hosts = +relay_hosts
                                                                                
  warn  message = ${perl{popbeforesmtpwarn}{$sender_host_address}}
        condition = ${perl{checkrelayhost}{$sender_host_address}}
  accept  condition = ${perl{checkrelayhost}{$sender_host_address}}

accept  hosts = +auth_relay_hosts
          endpass
          message = $sender_fullhost is currently not permitted to \
                        relay through this server. Perhaps you \
                        have not logged into the pop/imap server in the \
                        last 30 minutes or do not have SMTP Authentication turned on in your email client.
          authenticated = *

deny    message = $sender_fullhost is currently not permitted to \
                        relay through this server. Perhaps you \
                        have not logged into the pop/imap server in the \
                        last 30 minutes or do not have SMTP Authentication turned on in your email client.

#!!# ACL that is used after the DATA command
check_message:
#  Enabling this will make the server non-rfc compliant
#  require verify = header_sender
  accept

%ENDACLBLOCK%
@ENDACL@

begin authenticators

fixed_plain:
driver = plaintext
public_name = PLAIN
server_prompts = : 
server_condition = "${perl{checkuserpass}{$1}{$2}{$3}}"
server_set_id = $2

fixed_login:
driver = plaintext 
public_name = LOGIN 
server_prompts = "Username:: : Password::" 
server_condition = "${perl{checkuserpass}{$1}{$2}}"
server_set_id = $1

@AUTH@

######################################################################
#                      REWRITE CONFIGURATION                         #
######################################################################

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

begin rewrite

@REWRITE@

#!!#######################################################!!#
#!!# Here follow routers created from the old routers,   #!!#
#!!# for handling non-local domains.                     #!!#
#!!#######################################################!!#

begin routers

######################################################################
#                      ROUTERS CONFIGURATION                         #
#            Specifies how remote addresses are handled              #
######################################################################
#                          ORDER DOES MATTER                         #
#  A remote address is passed to each in turn until it is accepted.  #
######################################################################

# Remote addresses are those with a domain that does not match any item
# in the "local_domains" setting above.

democheck:
  driver = redirect
  condition = "${perl{democheck}}"
  data = :fail: demo accounts are not permitted to relay email

@ROUTERSTART@

# This router routes to remote hosts over SMTP using a DNS lookup with
# default options.

lookuphost:
  driver = dnslookup
  condition = "${perl{checkspam}}"
  domains = ! +local_domains
#ignore verisign to prevent waste of bandwidth
  ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8 : 64.94.110.0/24 
  headers_add = "${perl{mailtrapheaders}}"
  transport = remote_smtp

# This router routes to remote hosts over SMTP by explicit IP address,
# given as a "domain literal" in the form [nnn.nnn.nnn.nnn]. The RFCs
# require this facility, which is why it is enabled by default in Exim.
# If you want to lock it out, set forbid_domain_literals in the main
# configuration section above.

literal:
  driver = ipliteral
  condition = "${perl{checkspam}}"
  domains = ! +local_domains
  headers_add = "${perl{mailtrapheaders}}"
  transport = remote_smtp

#!!# This new router is put here to fail all domains that
#!!# were not in local_domains in the Exim 3 configuration.

fail_remote_domains:
  driver = redirect
  domains = ! +local_domains
  allow_fail
  data = :fail: unrouteable mail domain "$domain"

@ROUTEREND@

#!!#######################################################!!#
#!!# Here follow routers created from the old directors, #!!#
#!!# for handling local domains.                         #!!#
#!!#######################################################!!#

######################################################################
#                      DIRECTORS CONFIGURATION                       #
#             Specifies how local addresses are handled              #
######################################################################
#                          ORDER DOES MATTER                         #
#   A local address is passed to each in turn until it is accepted.  #
######################################################################

# Local addresses are those with a domain that matches some item in the
# "local_domains" setting above, or those which are passed back from the
# routers because of a "self=local" setting (not used in this configuration).

# This director handles aliasing using a traditional /etc/aliases file.
# If any of your aliases expand to pipes or files, you will need to set
# up a user and a group for these deliveries to run under. You can do
# this by uncommenting the "user" option below (changing the user name
# as appropriate) and adding a "group" option if necessary. Alternatively, you
# can specify "user" on the transports that are used. Note that those
# listed below are the same as are used for .forward files; you might want
# to set up different ones for pipe and file deliveries from aliases.

#spam_filter:
#  driver = forwardfile
#  file = /etc/spam.filter
#  no_check_local_user
#  no_verify
#  filter
#  allow_system_actions

@DIRECTORSTART@

virtual_sa_user:
  driver = accept 
  headers_add="${perl{gensaheader_virtual}{$domain}}"
  condition = "${perl{checksa_deliver}{$domain}{$local_part}{$received_protocol}}"
  domains = lsearch;/etc/userdomains
  retry_use_local_part
  transport = virtual_sa_userdelivery

sa_localuser:
  driver = accept
  check_local_user
  headers_add="${perl{gensaheader}{$local_part}}"
  condition = "${perl{checkusersa}{$local_part}{$received_protocol}}"
  domains = ! lsearch;/etc/userdomains
  transport = local_sa_delivery

central_filter:
#!!# filter renamed allow_filter
  driver = redirect
  allow_filter
  no_check_local_user
  file = /etc/vfilters/${domain}
  file_transport = address_file
  pipe_transport = virtual_address_pipe
  reply_transport = address_reply
  retry_use_local_part
  user = "${lookup{$domain}lsearch* {/etc/userdomains}{$value}}"
  no_verify

central_user_filter:  
  driver = redirect  
  allow_filter  
  check_local_user  
  domains = ! lsearch;/etc/userdomains
  condition = "${perl{hasfilterfile}{$local_part}}"  
  file = "${perl{getfilterfile}{$local_part}}"  
  file_transport = address_file  
  pipe_transport = virtual_address_pipe  
  reply_transport = address_reply  
  retry_use_local_part  
  no_verify

virtual_aliases_nostar:
  driver = redirect
  allow_defer
  allow_fail
  data = ${if exists{/etc/valiases/$domain}{${lookup{$local_part@$domain}lsearch{/etc/valiases/$domain}}}}
  file_transport = address_file
  group = mail
  pipe_transport = virtual_address_pipe
  retry_use_local_part
  domains = lsearch;/etc/localdomains
  unseen

virtual_user_spam:
  driver = accept
  condition = "${perl{check_deliver_spam}{$domain}{$local_part}}"
  headers_remove="x-spam-exim"
  domains = lsearch;/etc/userdomains
  retry_use_local_part
  transport = virtual_userdelivery_spam

virtual_user:
  driver = accept
  condition = "${perl{check_deliver}{$domain}{$local_part}}"
  headers_remove="x-spam-exim"
  domains = lsearch;/etc/userdomains
  retry_use_local_part
  transport = virtual_userdelivery

has_alias_but_no_mailbox_discarded_to_prevent_loop:
	driver = redirect
        condition = "${perl{checkvalias}{$domain}{$local_part}}"
 	domains = lsearch;/etc/localdomains
	data="#Exim Filter\nseen finish"
  	group = "${lookup{$domain}lsearch* {/etc/userdomains}{$value}}"
	user = "${lookup{$domain}lsearch* {/etc/userdomains}{$value}}"
	allow_filter
	disable_logging = true

virtual_aliases:
  driver = redirect
  allow_defer
  allow_fail
  data = ${if exists{/etc/valiases/$domain}{${lookup{*}lsearch{/etc/valiases/$domain}}}}
  file_transport = address_file
  group = mail
  pipe_transport = virtual_address_pipe
  domains = lsearch;/etc/localdomains
  retry_use_local_part

@DIRECTORMIDDLE@

# This director handles forwarding using traditional .forward files.
# If you want it also to allow mail filtering when a forward file
# starts with the string "# Exim filter", uncomment the "filter" option.
# The check_ancestor option means that if the forward file generates an
# address that is an ancestor of the current one, the current one gets
# passed on instead. This covers the case where A is aliased to B and B
# has a .forward file pointing to A. The three transports specified at the
# end are those that are used when forwarding generates a direct delivery
# to a file, or to a pipe, or sets up an auto-reply, respectively.

system_aliases:
  driver = redirect
  allow_defer
  allow_fail
  data = ${lookup{$local_part}lsearch{/etc/aliases}}
  file_transport = address_file
  pipe_transport = address_pipe
  retry_use_local_part
# user = exim

local_aliases:
  driver = redirect
  allow_defer
  allow_fail
  data = ${lookup{$local_part}lsearch{/etc/localaliases}}
  file_transport = address_file
  pipe_transport = address_pipe
  check_local_user

userforward:
#!!# filter renamed allow_filter
  driver = redirect
  allow_filter
  check_ancestor
  check_local_user
  domains = ! lsearch;/etc/userdomains
  no_expn
  file = $home/.forward
  file_transport = address_file
  pipe_transport = address_pipe
  reply_transport = address_reply
  no_verify

localuser_spam:
  driver = accept
  headers_remove="x-spam-exim"
  condition = "${perl{checkuserspambox}{$local_part}}"
  check_local_user
  domains = ! lsearch;/etc/userdomains
  transport = local_delivery_spam

localuser:
  driver = accept
  headers_remove="x-spam-exim"
  check_local_user
  domains = ! lsearch;/etc/userdomains
  transport = local_delivery

# This director matches local user mailboxes.

@DIRECTOREND@

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

# A transport is used only when referenced from a director or a router that
# successfully handles an address.

# This transport is used for delivering messages over SMTP connections.

begin transports

@TRANSPORTSTART@

remote_smtp:
  driver = smtp

# This transport is used for local delivery to user mailboxes. By default
# it will be run under the uid and gid of the local user, and requires
# the sticky bit to be set on the /var/mail directory. Some systems use
# the alternative approach of running mail deliveries under a particular
# group instead of using the sticky bit. The commented options below show
# how this can be done.

local_delivery:
  driver = appendfile
  delivery_date_add
  envelope_to_add
  directory = "${extract{5}{:}{${lookup passwd{$local_part}{$value}}}}/mail"
  maildir_format
  group = mail
  mode = 0660
  return_path_add
  user = $local_part

local_delivery_spam:
  driver = appendfile
  delivery_date_add
  envelope_to_add
  directory = "${extract{5}{:}{${lookup passwd{$local_part}{$value}}}}/mail/.spam"
  maildir_format
  group = mail
  mode = 0660
  return_path_add
  user = $local_part

local_sa_delivery:
  driver = pipe
  command = /usr/sbin/sendmail -bS
  use_bsmtp = true
  transport_filter = "/usr/bin/spamc"
  user = $local_part
  group = mail
  log_output = true
  current_directory = "/tmp"
  home_directory = "/tmp"
  return_fail_output = true
  return_path_add = false
  message_prefix = 
  message_suffix = 
  timeout_defer = true
  transport_filter_timeout = 5m
  temp_errors = 2

@TRANSPORTMIDDLE@

# This transport is used for handling pipe deliveries generated by alias
# or .forward files. If the pipe generates any standard output, it is returned
# to the sender of the message as a delivery error. Set return_fail_output
# instead of return_output if you want this to happen only when the pipe fails
# to complete normally. You can set different transports for aliases and
# forwards if you want to - see the references to address_pipe below.

address_pipe:
  driver = pipe
  return_output

virtual_address_pipe:
  driver = pipe
  group = "${lookup{$domain}lsearch* {/etc/userdomains}{$value}}"
  return_output
  user = "${lookup{$domain}lsearch* {/etc/userdomains}{$value}}"

# This transport is used for handling deliveries directly to files that are
# generated by aliassing or forwarding.

address_file:
  driver = appendfile
  delivery_date_add
  envelope_to_add
  return_path_add

# This transport is used for handling autoreplies generated by the filtering
# option of the forwardfile director.

virtual_sa_userdelivery:
  driver = pipe
  command = /usr/sbin/sendmail -bS
  use_bsmtp = true
  transport_filter = "/usr/bin/spamc"
  user = "${lookup{$domain}lsearch* {/etc/userdomains}{$value}}"
  group = mail
  log_output = true
  current_directory = "/tmp"
  home_directory = "/tmp"
  return_fail_output = true
  return_path_add = false
  message_prefix = 
  message_suffix = 
  timeout_defer = true
  transport_filter_timeout = 5m
  temp_errors = 2

virtual_userdelivery_spam:
  driver = appendfile
  delivery_date_add
  envelope_to_add
  directory = "${extract{5}{:}{${lookup passwd{${lookup{$domain}lsearch*{/etc/userdomains}{$value}}}{$value}}}}/mail/${domain}/${local_part}/.spam"
  maildir_format
  group = mail
  mode = 0660
  quota = "${if exists{${extract{5}{:}{${lookup passwd{${lookup{$domain}lsearch*{/etc/userdomains}{$value}}}{$value}}}}/etc/${domain}/quota} {${lookup{$local_part}lsearch*{${extract{5}{:}{${lookup passwd{${lookup{$domain}lsearch*{/etc/userdomains}{$value}}}{$value}}}}/etc/${domain}/quota}{$value}}} {}}"
  quota_directory = "${extract{5}{:}{${lookup passwd{${lookup{$domain}lsearch*{/etc/userdomains}{$value}}}{$value}}}}/mail/${domain}/${local_part}"
  return_path_add
  user = "${lookup{$domain}lsearch* {/etc/userdomains}{$value}}"

virtual_userdelivery:
  driver = appendfile
  delivery_date_add
  envelope_to_add
  directory = "${extract{5}{:}{${lookup passwd{${lookup{$domain}lsearch*{/etc/userdomains}{$value}}}{$value}}}}/mail/${domain}/${local_part}"
  maildir_format
  group = mail
  mode = 0660
  quota = "${if exists{${extract{5}{:}{${lookup passwd{${lookup{$domain}lsearch*{/etc/userdomains}{$value}}}{$value}}}}/etc/${domain}/quota} {${lookup{$local_part}lsearch*{${extract{5}{:}{${lookup passwd{${lookup{$domain}lsearch*{/etc/userdomains}{$value}}}{$value}}}}/etc/${domain}/quota}{$value}}} {}}"
  quota_directory = "${extract{5}{:}{${lookup passwd{${lookup{$domain}lsearch*{/etc/userdomains}{$value}}}{$value}}}}/mail/${domain}/${local_part}"
  return_path_add
  user = "${lookup{$domain}lsearch* {/etc/userdomains}{$value}}"

address_reply:
  driver = autoreply

@TRANSPORTEND@

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

# This single retry rule applies to all domains and all errors. It specifies
# retries every 15 minutes for 2 hours, then increasing retry intervals,
# starting at 1 hour and increasing each time by a factor of 1.5, up to 16
# hours, then retries every 8 hours until 4 days have passed since the first
# failed delivery.

# Domain               Error       Retries
# ------               -----       -------

begin retry

@RETRYSTART@

*                      *           F,2h,15m; G,16h,1h,1.5; F,4d,8h

@RETRYEND@

# End of Exim 4 configuration

MR SKB