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Edit: 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 = $primary_hostname : lsearch;/etc/localdomains

domainlist relay_domains = +local_domains : lsearch;/etc/secondarymx

domainlist manualmx_domains = ${if \
    exists {/etc/manualmx} \
    {lsearch;/etc/manualmx} \
    {} \
}

addresslist secondarymx = *@partial-lsearch;/etc/secondarymx

######################################################################
#                  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

# Specify a set of options to control the behavior of OpenSSL. The default is to
# disable SSLv2 and SSLv3 due to weaknesses in these protocols.
openssl_options = +no_sslv2 +no_sslv3

# 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%

# see etc/exim/defacls/universal.dist

%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

smarthost_login:
# block replaced by remotecf templates smarthost_login or no_smarthost_login
driver = plaintext
public_name = LOGIN
hide client_send = : user : password

@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.

@PREROUTERS@

blackhole_dovenull:
    driver= redirect
    local_parts = "@dovenull"
    allow_fail = true
    data = :fail: Unrouteable address

deliver_local_outside_jail:
    driver = manualroute
    require_files = "+/jail_owner"
    # users outside the jail will not be in /etc/passwd => We need to check if $local_part is in /jail_owner
    # we can't just check to see if they exist
    # because we still want to be able to mail root
    domains = +local_domains
    transport = remote_smtp
    route_list = "* 127.0.0.1"
    # self = send allows us to send outside the jail
    # we make sure /home/virtfs does not exist before we get here
    # to be safe
    self = send

suspendedcheck:
    driver = redirect
    domains = +local_domains
    local_parts = ${if eq {$domain} \
        {$primary_hostname} \
        {+path_safe_localparts} \
        {*} \
    }
    require_files = \
        +/etc/exim_suspended_list \
        : +/var/cpanel/suspended/${if eq {$domain} {$primary_hostname} \
            {$local_part} \
            {${lookup \
                {$domain} \
                lsearch{/etc/userdomains} \
                {$value} \
                {::::invalid::::} \
            }} \
        }
    local_part_suffix = +*
    local_part_suffix_optional
    allow_fail
    allow_defer
    allow_freeze
    # Sets r_suspendinfo to the contents of the suspendinfo file,
    # r_suspended_shell to the original shell of the suspended account,
    # r_suspended_redirect to the real mapped redirect setting.
    set = r_suspended_shell=${perl \
        {get_suspended_shell} \
        {${if eq {$domain} {$primary_hostname} \
            {$local_part} \
            {%CPANEL-domain-owner%} \
        }} \
    }
    # This skips content scanning for the primary account address with
    # live-transfers and handles the special :queue: setting by pretending
    # those are :blackhole: deliveries during address verification
    address_data = \
        router=$router_name \
        ${if \
            !match {${lookup \
                    {$local_part@$domain} \
                    wildlsearch{/etc/exim_suspended_list} \
                    {$value} \
                    {:unknown:} \
            }} \
            {\N^\s*(:unknown:.*)?$\N} \
            { \
                suspended=1 \
                redirect=${quote:${if \
                    !match{${lookup \
                            {$local_part@$domain} \
                            wildlsearch{/etc/exim_suspended_list} \
                            {$value} \
                            {:unknown:} \
                    }} \
                    {\N^\s*:\N} \
                    {${if eq \
                        {$verify_mode} \
                        {} \
                        {${lookup{$local_part@$domain} \
                            wildlsearch{/etc/exim_suspended_list} \
                            {$value} \
                            {:unknown:} \
                        }} \
                        {:blackhole:} \
                    }} \
                    {${sg \
                        {${lookup {$local_part@$domain} \
                            wildlsearch{/etc/exim_suspended_list} \
                            {$value} \
                            {:unknown:} \
                        }} \
                        {\N^\s*:queue:\N} \
                        {${if eq \
                            {$verify_mode} \
                            {} \
                            {:defer:} \
                            {:blackhole:} \
                        }} \
                    }} \
                }} \
            } \
        }
    data = %CPANEL-address-redirect%

democheck:
    driver = redirect
    require_files = "+/etc/demouids"
    condition = ${if >= {$originator_uid}{100}{1}{0}}
    condition = "${extract{size}{${stat:/etc/demouids}}}"
    condition = "${if eq \
        {${lookup \
            {$originator_uid} \
            lsearch{/etc/demouids} \
            {$value} \
        }} \
        {} \
        {false} \
        {true} \
    }"
    allow_fail
    data = :fail: demo accounts are not permitted to relay email

#
# This is to make sure that cpanel@* always passes sender verification
# so that the system notifications don't get rejected by spam filters
# doing a sender verification check.
#
blackhole_cpanel_at:
    driver = redirect
    local_parts = cpanel
    domains = !$primary_hostname
    verify_only
    data = :blackhole:

cpanel_archiver:
    driver = redirect
    condition = 0
    data = :fail: This router is a placeholder

@ROUTERSTART@

#
# Handles identification of messages, nobody and webspam and mail trap checks
# in check_mail_permissions and notifies if we are defering a message
#

check_mail_permissions:
    domains = ! +local_domains
    condition =  ${if eq {$authenticated_id}{root}{0}{1}}
    ignore_target_hosts = +loopback : 64.94.110.0/24
    driver = redirect
    allow_filter
    reply_transport = address_reply
    user = mailnull
    no_verify
    expn = false
    condition = "${perl{check_mail_permissions}}"
    data = "${perl{check_mail_permissions_results}}"

discover_sender_information:
    driver = redirect
    condition = 0
    data = :fail: This router is a placeholder

#
# If check_mail_permissions needs to defer or fail a message it is done here
#
enforce_mail_permissions:
    domains = ! +local_domains
    ignore_target_hosts = +loopback : 64.94.110.0/24
    condition =  ${if eq {$authenticated_id}{root}{0}{1}}
    driver = redirect
    allow_fail
    allow_defer
    no_verify
    expn = false
    condition = "${perl{enforce_mail_permissions}}"
    data = "${perl{enforce_mail_permissions_results}}"

#
# Increments max emails per hour if needed
#
increment_max_emails_per_hour_if_needed:
    domains = ! +local_domains
    ignore_target_hosts = +loopback : 64.94.110.0/24
    condition =  ${if eq {$authenticated_id}{root}{0}{1}}
    driver = redirect
    allow_fail
    no_verify
    one_time
    expn = false
    condition = "${perl{increment_max_emails_per_hour_if_needed}}"
    data = ":unknown:"

@POSTMAILCOUNT@

reject_forwarded_mail_marked_as_spam:
    driver = redirect
    condition = 0
    data = :fail: This router is a placeholder

# This router routes to a statically defined host from /etc/manualmx
# so that any mail received for the domain will skip MX lookups and attempt to
# deliver the message directly to the specified host.
manualmx:
    driver = manualroute
    domains = +manualmx_domains
    transport = remote_smtp
    route_data = ${lookup \
        {$domain} \
        lsearch{/etc/manualmx} \
    }

#
# lookuphost router
#

lookuphost:
    # lookuphost router can be replaced by etc/exim/replacecf/dkim/lookuphost
    driver = dnslookup
    ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8 : 64.94.110.0/24
    domains = ! +local_domains
#ignore verisign to prevent waste of bandwidth
    headers_add = "${perl{mailtrapheaders}}"
.ifdef SRSENABLED
    # if outbound, and forwarding has been done, use an alternate transport
    transport = ${if eq {$local_part@$domain} \
                        {$original_local_part@$original_domain} \
                     {remote_smtp} {remote_forwarded_smtp}}
.else
    transport = remote_smtp
.endif

# 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 Transports .. ignores verisigns sitefinder service
#

literal:
    driver = ipliteral
    domains = ! +local_domains
    ignore_target_hosts = +loopback : 64.94.110.0/24
    headers_add = "${perl{mailtrapheaders}}"
.ifdef SRSENABLED
    # if outbound, and forwarding has been done, use an alternate transport
    transport = ${if eq {$local_part@$domain} \
                        {$original_local_part@$original_domain} \
                     {remote_smtp} {remote_forwarded_smtp}}
.else
    transport = remote_smtp
.endif

@ROUTERMIDDLE@

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

#
# Trap Failures to Remote Domain
#

fail_remote_domains:
    driver = redirect
    domains = ! +local_domains : ! localhost : ! localhost.localdomain
    allow_fail
    data = ${if eq {$verify_mode}{S} \
        {:fail: The mail server does not recognize $local_part@$domain as a valid sender.} \
        {:fail: The mail server could not deliver mail to $local_part@$domain.  The account or domain may not exist, they may be blacklisted, or missing the proper dns entries.} \
    }

@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@

@PREFILTER@

#
# Account level filtering for everything but the main account
#

central_filter:
    driver = redirect
    allow_filter
    allow_fail
    forbid_filter_run
    forbid_filter_perl
    forbid_filter_lookup
    forbid_filter_readfile
    forbid_filter_readsocket
    no_check_local_user
    domains = !$primary_hostname : dsearch;/etc/vfilters
    require_files = "+/etc/vfilters/${domain_data}"
    condition = "${extract \
        {size} \
        {${stat:/etc/vfilters/${domain_data}}} \
    }"
    file = /etc/vfilters/${domain_data}
    file_transport = address_file
    directory_transport = address_directory
    pipe_transport = ${if forall \
        {/bin/cagefs_enter:/usr/sbin/cagefsctl} \
        {exists{$item}} \
        {cagefs_virtual_address_pipe} \
        {${if forany \
            {%CPANEL-user-domain%:$r_suspended_shell} \
            {match{$item}{\N(jail|no)shell\N}} \
            {jailed_virtual_address_pipe} \
            {virtual_address_pipe} \
        }} \
    }
    reply_transport = address_reply
    router_home_directory = %CPANEL-domain-owner-homedir%
    user = "%CPANEL-domain-owner%"
    no_verify

#
# Account level filtering for the main account
#
# checks /etc/vfilters/maindomain if its a localuser (ie main acct)
#
mainacct_central_user_filter:
    driver = redirect
    allow_filter
    allow_fail
    forbid_filter_run
    forbid_filter_perl
    forbid_filter_lookup
    forbid_filter_readfile
    forbid_filter_readsocket
    check_local_user
    domains = $primary_hostname
    condition = ${if eq \
        {${lookup \
            {$local_part_data} \
            lsearch{/etc/domainusers} \
            {$value} \
        }} \
        {} \
        {0} \
        {${if exists \
            {/etc/vfilters/${lookup \
                {$local_part_data} \
                lsearch{/etc/domainusers} \
                {$value} \
            }} \
            {${extract \
                {size} \
                {${stat:/etc/vfilters/${lookup \
                    {$local_part_data} \
                    lsearch{/etc/domainusers} \
                    {$value} \
                }}} \
            }} \
            {0} \
        }} \
    }
    file = "/etc/vfilters/${lookup \
        {$local_part_data} \
        lsearch{/etc/domainusers} \
        {$value} \
    }"
    directory_transport = address_directory
    file_transport = address_file
    pipe_transport = ${if forall \
        {/bin/cagefs_enter:/usr/sbin/cagefsctl} \
        {exists{$item}} \
        {cagefs_address_pipe} \
        {${if forany \
            {%CPANEL-local-username%:$r_suspended_shell} \
            {match{$item}{\N(jail|no)shell\N}} \
            {jailed_address_pipe} \
            {address_pipe} \
        }} \
    }
    reply_transport = address_reply
    user = $local_part_data
    group = $local_part_data
    retry_use_local_part
    no_verify

#
# User Level Filtering for the main account
#

central_user_filter:
    driver = redirect
    allow_filter
    allow_fail
    forbid_filter_run
    forbid_filter_perl
    forbid_filter_lookup
    forbid_filter_readfile
    forbid_filter_readsocket
    check_local_user
    domains = $primary_hostname

require_files = "+%CPANEL-local-user-homedir%/etc/filter"
    condition = "${extract \
        {size} \
        {${stat:%CPANEL-local-user-homedir%/etc/filter}} \
    }"
    file = "%CPANEL-local-user-homedir%/etc/filter"
    router_home_directory = %CPANEL-local-user-homedir%
    directory_transport = address_directory
    file_transport = address_file
    pipe_transport = ${if forall \
        {/bin/cagefs_enter:/usr/sbin/cagefsctl} \
        {exists{$item}} \
        {cagefs_address_pipe} \
        {${if forany \
            {%CPANEL-local-username%:$r_suspended_shell} \
            {match{$item}{\N(jail|no)shell\N}} \
            {jailed_address_pipe} \
            {address_pipe} \
        }} \
    }
    reply_transport = address_reply
    user = $local_part_data
    group = $local_part_data
    local_part_suffix = +*
    local_part_suffix_optional
    retry_use_local_part
    no_verify

#
# User Level Filtering for virtual users
#

virtual_user_filter:
    driver = redirect
    allow_filter
    allow_fail
    forbid_filter_run
    forbid_filter_perl
    forbid_filter_lookup
    forbid_filter_readfile
    forbid_filter_readsocket
    domains = \
        !$primary_hostname \
        : ${lookup \
            {$domain} \
            lsearch{/etc/userdomains} \
            {${perl{untaint}{$domain}}} \
        }
    require_files = "+%CPANEL-domain-owner-homedir%/etc/$domain_data/$local_part_data/filter"
    user = "%CPANEL-domain-owner%"
    router_home_directory = %CPANEL-domain-owner-homedir%
    local_parts = ${if exists{%CPANEL-domain-owner-homedir%/etc/$domain_data}{dsearch;%CPANEL-domain-owner-homedir%/etc/$domain_data}}
    condition = "${extract{size}{${stat:$home/etc/$domain_data/$local_part_data/filter}}}"
    file = "$home/etc/$domain_data/$local_part_data/filter"
    directory_transport = address_directory
    file_transport = address_file
    pipe_transport = ${if forall \
        {/bin/cagefs_enter:/usr/sbin/cagefsctl} \
        {exists{$item}} \
        {cagefs_virtual_address_pipe} \
        {${if forany \
            {%CPANEL-user-domain%:$r_suspended_shell} \
            {match{$item}{\N(jail|no)shell\N}} \
            {jailed_virtual_address_pipe} \
            {virtual_address_pipe} \
        }} \
    }
    reply_transport = address_reply
    local_part_suffix = +*
    local_part_suffix_optional
    retry_use_local_part
    no_verify

@PREVALIASNOSTAR@

virtual_aliases_nostar:
    driver = redirect
    allow_defer
    allow_fail
    domains = !$primary_hostname : dsearch;/etc/valiases
    user = "%CPANEL-domain-owner%"
    address_data = \
        "router=$router_name \
        redirect=${quote:${lookup \
            {$local_part@$domain_data} \
            lsearch{/etc/valiases/$domain_data} \
    }}"
    data = %CPANEL-address-redirect%
    file_transport = address_file
    pipe_transport = ${if forall \
        {/bin/cagefs_enter:/usr/sbin/cagefsctl} \
        {exists{$item}} \
        {cagefs_virtual_address_pipe} \
        {${if forany \
            {%CPANEL-local-username%:$r_suspended_shell} \
            {match{$item}{\N(jail|no)shell\N}} \
            {jailed_virtual_address_pipe} \
            {virtual_address_pipe} \
        }} \
    }
    router_home_directory = %CPANEL-domain-owner-homedir%
    local_part_suffix = +*
    local_part_suffix_optional
    retry_use_local_part
    unseen

virtual_user_overquota:
    driver = redirect
    condition = 0
    data = :fail: This router is a placeholder

@PREVIRTUALUSER@

#
# Virtual User Spam Boxes
#

virtual_user_spam:
    driver = redirect
    local_parts = +path_safe_localparts
    domains = \
        !$primary_hostname \
        : ${lookup \
            {$domain} \
            lsearch{/etc/userdomains} \
            {${perl{untaint}{$domain}}} \
        }
    condition = ${if match{$h_x-spam-status:}{\N^Yes\N}{true}{false}}
    require_files = \
        "+%CPANEL-domain-owner-homedir%/.spamassassinboxenable: \
            +%CPANEL-domain-owner-homedir%/mail/$domain_data/$local_part"
    router_home_directory = %CPANEL-domain-owner-homedir%
    headers_remove="x-uidl"
    data = "${quote_local_part:$local_part}+spam@$domain_data"
    redirect_router = virtual_user

virtual_user:
    driver = accept
    domains = \
        !$primary_hostname \
        : ${lookup \
            {$domain} \
            lsearch{/etc/userdomains} \
            {${perl{untaint}{$domain}}} \
        }
    local_parts = +path_safe_localparts
    require_files = "+%CPANEL-domain-owner-homedir%/mail/$domain_data/$local_part"
    router_home_directory = %CPANEL-domain-owner-homedir%
    headers_remove="x-uidl"
    local_part_suffix = +*
    local_part_suffix_optional
    user = mailnull
    group = mail
    transport = dovecot_virtual_delivery
    set = r_bcc_addr=${if forany \
        {${addresses:$h_to:}:${addresses:$h_cc:}} \
        {or { \
            {eqi \
                {${extract{1}{+}{${local_part:$item}}}@${domain:$item}} \
                {$local_part@$domain_data} \
            } \
            {eqi \
                {${extract{1}{+}{${local_part:$item}}}@${domain:$item}} \
                {$original_local_part@$original_domain} \
            } \
        }} \
        {} \
        {$local_part@$domain} \
    }
    set = r_cpanel_user=%CPANEL-domain-owner%
    #
    # If the delivery address, original address (forwarded),
    # or address with subaddress is shown on the To: or Cc:
    # lines or the message has the List-Id: or Precedence:
    # header we allow the message to be batched to
    # dovecot LMTP via transport dovecot_virtual_delivery
    #
    # If it does match match the above we do not allow the message
    # to be batched in order to ensure that the Envelope-To: header
    # does not contain a user that was Bcc:ed so savvy recipients
    # cannot see that another email was Bcc:ed in the header
    # via transport dovecot_virtual_delivery_no_batch
    #
    # Note: match_address would be nice here but the second string
    # is not expanded for security reasons
    #

@PRENOALIASDISCARD@

#
# has_alias_but_no_mailbox_discarded_to_prevent_loop required either of the following:
#
# 1. There is an active alias in the valias file
# 2. There is an active autoresponder and the * is set to :fail:
#
has_alias_but_no_mailbox_discarded_to_prevent_loop:
    driver = redirect
    domains = !$primary_hostname : dsearch;/etc/valiases
    condition = ${lookup \
        {$local_part@$domain_data} \
        lsearch{/etc/valiases/$domain_data} \
        {1} \
        {0} \
    }
    condition = "${if forany{<, \
        ${lookup \
            {$local_part@$domain_data} \
            lsearch{/etc/valiases/$domain_data} \
            {$value} \
        }} \
        {!match{$item}{\N/autorespond\N}} \
        {1} \
        {${if match \
            {${lookup \
                {\N*\N} \
                lsearch{/etc/valiases/$domain_data} \
                {$value} \
            }} \
            {:fail:} \
            {1} \
            {0} \
        }} \
    }"
    data=":blackhole:"
    local_part_suffix = +*
    local_part_suffix_optional
    disable_logging = true

srs_placeholder_pre:
    driver = redirect
    condition = 0
    data = :fail: This router is a placeholder

@PREVALIASSTAR@

virtual_aliases:
    driver = redirect
    allow_defer
    allow_fail
    domains = !$primary_hostname : dsearch;/etc/valiases
    user = "%CPANEL-domain-owner%"
    router_home_directory = %CPANEL-domain-owner-homedir%
    address_data = \
        "router=$router_name \
        redirect=${quote:${lookup \
            {*} \
            lsearch{/etc/valiases/$domain_data} \
        }}"
    data = %CPANEL-address-redirect%
    file_transport = address_file
    pipe_transport = ${if forall \
        {/bin/cagefs_enter:/usr/sbin/cagefsctl} \
        {exists{$item}} \
        {cagefs_virtual_address_pipe} \
        {${if forany \
            {%CPANEL-local-username%:$r_suspended_shell} \
            {match{$item}{\N(jail|no)shell\N}} \
            {jailed_virtual_address_pipe} \
            {virtual_address_pipe} \
        }} \
    }

@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
    domains = $primary_hostname : localhost
    address_data = \
        "router=$router_name \
        redirect=${quote: \
            ${lookup \
                {$local_part} \
                lsearch{/etc/aliases} \
            }}"
    data = %CPANEL-address-redirect%
    file_transport = address_file
    pipe_transport = address_pipe
    # user = exim

local_aliases:
    driver = redirect
    allow_defer
    allow_fail
    domains = $primary_hostname : localhost
    address_data = \
        "router=$router_name \
        redirect=${quote: \
            ${lookup \
                {$local_part} \
                lsearch{/etc/localaliases} \
            }}"
    data = %CPANEL-address-redirect%
    file_transport = address_file
    pipe_transport = address_pipe
    check_local_user

@PREDOTFORWARD@

userforward:
    driver = redirect
    allow_filter
    allow_fail
    forbid_filter_run
    forbid_filter_perl
    forbid_filter_lookup
    forbid_filter_readfile
    forbid_filter_readsocket
    check_ancestor
    check_local_user
    domains = $primary_hostname
    no_expn
    require_files = "+$home/.forward"
    condition = "${extract{size}{${stat:$home/.forward}}}"
    file = $home/.forward
    file_transport = address_file
    pipe_transport = ${if forall \
        {/bin/cagefs_enter:/usr/sbin/cagefsctl} \
        {exists{$item}} \
        {cagefs_address_pipe} \
        {${if forany \
            {%CPANEL-local-username%:$r_suspended_shell} \
            {match{$item}{\N(jail|no)shell\N}} \
            {jailed_address_pipe} \
            {address_pipe} \
        }} \
    }
    reply_transport = address_reply
    directory_transport = address_directory
    user = $local_part_data
    group = $local_part_data
    no_verify

srs_placeholder:
    driver = redirect
    condition = 0
    data = :fail: This router is a placeholder

@PRELOCALUSER@

localuser_root:
    driver = redirect
    allow_fail
    domains = $primary_hostname : localhost
    check_local_user
    condition = ${if eq {$local_part_data}{root}}
    data = :fail: root cannot accept local mail deliveries

localuser_overquota:
    driver = redirect
    condition = 0
    data = :fail: This router is a placeholder

#
# Optimized spambox router
#

localuser_spam:
    driver = redirect
    domains = $primary_hostname
    require_files = "+$home/.spamassassinboxenable"
    condition = ${if match{$h_x-spam-status:}{\N^Yes\N}{true}{false}}
# sets home,user,group
    check_local_user
    headers_remove="x-uidl"
    data = "${quote_local_part:$local_part_data}+spam"
    redirect_router = localuser

localuser:
    driver = accept
# sets home,user,group
    check_local_user
    domains = $primary_hostname
    headers_remove="x-uidl"
    local_part_suffix = +*
    local_part_suffix_optional
    user = mailnull
    group = mail
    transport = dovecot_delivery
    set = r_bcc_addr=${if forany \
        {${addresses:$h_to:}:${addresses:$h_cc:}} \
        {or { \
            { eqi \
                {${extract \
                    {1} \
                    {+} \
                    {${local_part:$item}} \
                }@${domain:$item}} \
                {$local_part@$domain} \
            } \
            { eqi \
                {${extract \
                    {1} \
                    {+} \
                    {${local_part:$item}} \
                }@${domain:$item}} \
                {$original_local_part@$original_domain} \
            } \
        }} \
        {} \
        {$local_part@$domain} \
    }
    set = r_cpanel_user=${local_part}
    #
    # If the delivery address, original address (forwarded),
    # or address with subaddress is shown on the To: or Cc:
    # lines or the message has the List-Id: or Precedence:
    # header we allow the message to be batched to
    # dovecot LMTP via transport dovecot_virtual_delivery
    #
    # If it does match match the above we do not allow the message
    # to be batched in order to ensure that the Envelope-To: header
    # does not contain a user that was Bcc:ed so savvy recipients
    # cannot see that another email was Bcc:ed in the header
    # via transport dovecot_virtual_delivery_no_batch
    #
    # Note: match_address would be nice here but the second string
    # is not expanded for security reasons
    #

# 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:
    # placeholder for the contents of replacecf target of the same name
    driver = smtp

remote_forwarded_smtp:
    # placeholder for the contents of replacecf target of the same name
    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.

@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
    return_output

jailed_address_pipe:
    driver = pipe
    force_command
    command = /usr/local/cpanel/bin/jailexec $address_pipe
    return_output

jailed_virtual_address_pipe:
    driver = pipe
    force_command
    command = /usr/local/cpanel/bin/jailexec $address_pipe
    return_output

cagefs_address_pipe:
    driver = pipe
    force_command
    command = /bin/cagefs_enter $address_pipe
    return_output

cagefs_virtual_address_pipe:
    driver = pipe
    force_command
    command = /bin/cagefs_enter $address_pipe
    return_output

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

address_file:
    driver = pipe
    command = /usr/libexec/dovecot/dovecot-lda -e -f $sender_address -d ${perl{convert_address_directory_to_dovecot_lda_destination_username}} -m ${perl{convert_address_directory_to_dovecot_lda_mailbox}}
    message_prefix =
    message_suffix =
    log_output
    delivery_date_add
    envelope_to_add
    return_path_add
    temp_errors = 64 : 69 : 70: 71 : 72 : 73 : 74 : 75 : 78

dovecot_delivery:
    driver = lmtp
    socket = /var/run/dovecot/lmtp
    batch_max = 200
    batch_id = "$r_cpanel_user ${if def:r_bcc_addr {$r_bcc_addr}}"
    rcpt_include_affixes
    delivery_date_add
    envelope_to_add
    return_path_add

dovecot_virtual_delivery:
    driver = lmtp
    socket = /var/run/dovecot/lmtp
    batch_max = 200
    batch_id = "$r_cpanel_user ${if def:r_bcc_addr {$r_bcc_addr}}"
    rcpt_include_affixes
    delivery_date_add
    envelope_to_add
    return_path_add

address_reply:
    driver = autoreply

cpanel_archiver_transport:
    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@

+secondarymx           *           F,4h,5m; G,16h,1h,1.5; F,4d,8h
*                      *           F,2h,15m; G,16h,1h,1.5; F,4d,8h

@RETRYEND@

# End of Exim 4 configuration

📁 ＳＫＹＳＨＥＬＬ ＭＡＮＡＧＥＲ PHP v8.2.31

Edit: exim.conf.dist

📁 ＳＫＹＳＨＥＬＬＭＡＮＡＧＥＲ PHP v8.2.31