Fix GNU/Hurd build. Bug 3044

[exim.git] / src / src / configure.default

diff --git a/src/src/configure.default b/src/src/configure.default
index 6b09309ad300e76607d02a2c800ed4f60740417f..633c6539e96979c24f12a0708ba87d685218247f 100644 (file)
--- a/src/src/configure.default
+++ b/src/src/configure.default
@@ -1,5 +1,3 @@
-# $Cambridge: exim/src/src/configure.default,v 1.6 2005/11/21 10:00:26 ph10 Exp $
-

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


@@ -11,7 +9,7 @@
 # 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, PDF) are available
 # 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, PDF) are available

-# from the Exim ftp sites. The manual is also online at the Exim web sites.
+# from the Exim ftp sites. The manual is also online at the Exim website.

 
 
 # This file is divided into several parts, all but the first of which are
 
 
 # This file is divided into several parts, all but the first of which are


@@ -39,9 +37,22 @@
 
 
 
 
 
 

+######################################################################
+#                               MACROS                               #
+######################################################################
+#
+
+# If you want to use a smarthost instead of sending directly to recipient
+# domains, uncomment this macro definition and set a real hostname.
+# An appropriately privileged user can then redirect email on the command-line
+# in emergencies, via -D.
+#
+# ROUTER_SMARTHOST=MAIL.HOSTNAME.FOR.CENTRAL.SERVER.EXAMPLE
+

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

+#

 
 # 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
 
 # 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


@@ -58,11 +69,13 @@
 
 domainlist local_domains = @
 domainlist relay_to_domains =
 
 domainlist local_domains = @
 domainlist relay_to_domains =

-hostlist   relay_from_hosts = 127.0.0.1
+hostlist   relay_from_hosts = localhost
+# (We rely upon hostname resolution working for localhost, because the default
+# uncommented configuration needs to work in IPv4-only environments.)

 
 # Most straightforward access control requirements can be obtained by
 # appropriate settings of the above options. In more complicated situations,
 
 # Most straightforward access control requirements can be obtained by
 # appropriate settings of the above options. In more complicated situations,

-# you may need to modify the Access Control List (ACL) which appears later in
+# you may need to modify the Access Control Lists (ACLs) which appear later in

 # this file.
 
 # The first setting specifies your local domains, for example:
 # this file.
 
 # The first setting specifies your local domains, for example:


@@ -93,20 +106,24 @@ hostlist   relay_from_hosts = 127.0.0.1
 # to any other host on the Internet. Such a setting commonly refers to a
 # complete local network as well as the localhost. For example:
 #
 # to any other host on the Internet. Such a setting commonly refers to a
 # complete local network as well as the localhost. For example:
 #

-# hostlist relay_from_hosts = 127.0.0.1 : 192.168.0.0/16
+# hostlist relay_from_hosts = <; 127.0.0.1 ; ::1 ; 192.168.0.0/16

 #
 # The "/16" is a bit mask (CIDR notation), not a number of hosts. Note that you
 # have to include 127.0.0.1 if you want to allow processes on your host to send
 # SMTP mail by using the loopback address. A number of MUAs use this method of
 #
 # The "/16" is a bit mask (CIDR notation), not a number of hosts. Note that you
 # have to include 127.0.0.1 if you want to allow processes on your host to send
 # SMTP mail by using the loopback address. A number of MUAs use this method of

-# sending mail.
+# sending mail.  Often, connections are made to "localhost", which might be ::1
+# on IPv6-enabled hosts.  Do not forget CIDR for your IPv6 networks.

 
 # All three of these lists may contain many different kinds of item, including
 # wildcarded names, regular expressions, and file lookups. See the reference
 # manual for details. The lists above are used in the access control lists for
 # checking incoming messages. The names of these ACLs are defined here:
 
 
 # All three of these lists may contain many different kinds of item, including
 # wildcarded names, regular expressions, and file lookups. See the reference
 # manual for details. The lists above are used in the access control lists for
 # checking incoming messages. The names of these ACLs are defined here:
 

-acl_smtp_rcpt = acl_check_rcpt
-acl_smtp_data = acl_check_data
+acl_smtp_rcpt =         acl_check_rcpt
+.ifdef _HAVE_PRDR
+acl_smtp_data_prdr =    acl_check_prdr
+.endif
+acl_smtp_data =         acl_check_data

 
 # You should not change those settings until you understand how ACLs work.
 
 
 # You should not change those settings until you understand how ACLs work.
 


@@ -130,6 +147,56 @@ acl_smtp_data = acl_check_data
 # spamd_address = 127.0.0.1 783
 
 
 # spamd_address = 127.0.0.1 783
 
 

+# If Exim is compiled with support for TLS, you may want to change the
+# following option so that Exim disallows certain clients from makeing encrypted
+# connections. The default is to allow all.
+# In the authenticators section below, there are template configurations for
+# plaintext username/password authentication. This kind of authentication is
+# only safe when used within a TLS connection, so the authenticators will only
+# work if TLS is allowed here.
+
+# This is equivalent to the default.
+
+# tls_advertise_hosts = *
+
+# Specify the location of the Exim server's TLS certificate and private key.
+# The private key must not be encrypted (password protected). You can put
+# the certificate and private key in the same file, in which case you only
+# need the first setting, or in separate files, in which case you need both
+# options.
+
+# tls_certificate = /etc/ssl/exim.crt
+# tls_privatekey = /etc/ssl/exim.pem
+
+# For OpenSSL, prefer EC- over RSA-authenticated ciphers
+.ifdef _HAVE_OPENSSL
+tls_require_ciphers = ECDSA:RSA:!COMPLEMENTOFDEFAULT
+.endif
+
+# Don't offer resumption to (most) MUAs, who we don't want to reuse
+# tickets.  Once the TLS extension for vended ticket numbers comes
+# though, re-examine since resumption on a single-use ticket is still a benefit.
+.ifdef _HAVE_TLS_RESUME
+tls_resumption_hosts = ${if inlist {$received_port}{587:465} {:}{*}}
+.endif
+
+# In order to support roaming users who wish to send email from anywhere,
+# you may want to make Exim listen on other ports as well as port 25, in
+# case these users need to send email from a network that blocks port 25.
+# The standard ports for this purpose are:
+# port 587, the "message submission" port - see RFC 4409 for details,
+# and 465 the TLS-encrypted "submission" port, service name is "submissions",
+# see RFC 8314.
+
+# Microsoft MUAs cannot be configured to
+# talk the message submission protocol correctly, so if you need to support
+# them you should also allow TLS-on-connect on the traditional (and now
+# standard) port 465.
+
+# daemon_smtp_ports = 25 : 465 : 587
+# tls_on_connect_ports = 465
+
+

 # 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.example" is a fully qualified
 # 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.example" is a fully qualified


@@ -161,14 +228,15 @@ acl_smtp_data = acl_check_data
 # allow_domain_literals
 
 
 # allow_domain_literals
 
 

-# No deliveries will ever be run under the uids of these users (a colon-
-# separated list). An attempt to do so causes a panic error to be logged, and
-# the delivery to be deferred. This is a paranoic safety catch. There is an
-# even stronger safety catch in the form of the FIXED_NEVER_USERS setting
-# in the configuration for building Exim. The list of users that it specifies
-# is built into the binary, and cannot be changed. The option below just adds
-# additional users to the list. The default for FIXED_NEVER_USERS is "root",
-# but just to be absolutely sure, the default here is also "root".
+# No deliveries will ever be run under the uids of users specified by
+# never_users (a colon-separated list). An attempt to do so causes a panic
+# error to be logged, and the delivery to be deferred. This is a paranoic
+# safety catch. There is an even stronger safety catch in the form of the
+# FIXED_NEVER_USERS setting in the configuration for building Exim. The list of
+# users that it specifies is built into the binary, and cannot be changed. The
+# option below just adds additional users to the list. The default for
+# FIXED_NEVER_USERS is "root", but just to be absolutely sure, the default here
+# is also "root".

 
 # Note that 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
 
 # Note that 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


@@ -185,17 +253,40 @@ never_users = root
 host_lookup = *
 
 
 host_lookup = *
 
 

-# The settings below, which are actually the same as the defaults in the
-# code, cause Exim to make RFC 1413 (ident) callbacks for all incoming SMTP
-# calls. You can limit the hosts to which these calls are made, and/or change
-# the timeout that is used. If you set the timeout to zero, all RFC 1413 calls
-# are disabled. RFC 1413 calls are cheap and can provide useful information
-# for tracing problem messages, but some hosts and firewalls have problems
-# with them. This can result in a timeout instead of an immediate refused
-# connection, leading to delays on starting up an SMTP session.
+# The setting below causes Exim to try to initialize the system resolver
+# library with DNSSEC support.  It has no effect if your library lacks
+# DNSSEC support.
+
+dns_dnssec_ok = 1

 
 

-rfc1413_hosts = *
-rfc1413_query_timeout = 30s
+
+# The settings below cause Exim to make RFC 1413 (ident) callbacks
+# for all incoming SMTP calls. You can limit the hosts to which these
+# calls are made, and/or change the timeout that is used. If you set
+# the timeout to zero, all RFC 1413 calls are disabled. RFC 1413 calls
+# are cheap and can provide useful information for tracing problem
+# messages, but some hosts and firewalls have problems with them.
+# This can result in a timeout instead of an immediate refused
+# connection, leading to delays on starting up SMTP sessions.
+# (The default was reduced from 30s to 5s for release 4.61. and to
+# disabled for release 4.86)
+#
+#rfc1413_hosts = *
+#rfc1413_query_timeout = 5s
+
+
+# Enable an efficiency feature.  We advertise the feature; clients
+# may request to use it.  For multi-recipient mails we then can
+# reject or accept per-user after the message is received.
+# This supports recipient-dependent content filtering; without it
+# you have to temp-reject any recipients after the first that have
+# incompatible filtering, and do the filtering in the data ACL.
+# Even with this enabled, you must support the old style for peers
+# not flagging support for PRDR (visible via $prdr_requested).
+#
+.ifdef _HAVE_PRDR
+prdr_enable = true
+.endif

 
 
 # By default, Exim expects all envelope addresses to be fully qualified, that
 
 
 # By default, Exim expects all envelope addresses to be fully qualified, that


@@ -211,6 +302,13 @@ rfc1413_query_timeout = 30s
 # and/or qualify_recipient (see above).
 
 
 # and/or qualify_recipient (see above).
 
 

+# Unless you run a high-volume site you probably want more logging
+# detail than the default.  Adjust to suit.
+
+log_selector = +smtp_protocol_error +smtp_syntax_error \
+        +tls_certificate_verified
+
+

 # If you want Exim to support the "percent hack" for certain domains,
 # uncomment the following line and provide a list of domains. The "percent
 # hack" is the feature by which mail addressed to x%y@z (where z is one of
 # If you want Exim to support the "percent hack" for certain domains,
 # uncomment the following line and provide a list of domains. The "percent
 # hack" is the feature by which mail addressed to x%y@z (where z is one of


@@ -240,6 +338,54 @@ ignore_bounce_errors_after = 2d
 timeout_frozen_after = 7d
 
 
 timeout_frozen_after = 7d
 
 

+# By default, messages that are waiting on Exim's queue are all held in a
+# single directory called "input" which is itself within Exim's spool
+# directory. (The default spool directory is specified when Exim is built, and
+# is often /var/spool/exim/.) Exim works best when its queue is kept short, but
+# there are circumstances where this is not always possible. If you uncomment
+# the setting below, messages on the queue are held in 62 subdirectories of
+# "input" instead of all in the same directory. The subdirectories are called
+# 0, 1, ... A, B, ... a, b, ... z. This has two benefits: (1) If your file
+# system degrades with many files in one directory, this is less likely to
+# happen; (2) Exim can process the queue one subdirectory at a time instead of
+# all at once, which can give better performance with large queues.
+
+# split_spool_directory = true
+
+
+# If you're in a part of the world where ASCII is not sufficient for most
+# text, then you're probably familiar with RFC2047 message header extensions.
+# By default, Exim adheres to the specification, including a limit of 76
+# characters to a line, with encoded words fitting within a line.
+# If you wish to use decoded headers in message filters in such a way
+# that successful decoding of malformed messages matters, you may wish to
+# configure Exim to be more lenient.
+#
+# check_rfc2047_length = false
+#
+# In particular, the Exim maintainers have had multiple reports of problems
+# from Russian administrators of issues until they disable this check,
+# because of some popular, yet buggy, mail composition software.
+
+
+# If you wish to be strictly RFC compliant, or if you know you'll be
+# exchanging email with systems that are not 8-bit clean, then you may
+# wish to disable advertising 8BITMIME.  Uncomment this option to do so.
+
+# accept_8bitmime = false
+
+
+# Exim does not make use of environment variables itself. However,
+# libraries that Exim uses (e.g. LDAP) depend on specific environment settings.
+# There are two lists: keep_environment for the variables we trust, and
+# add_environment for variables we want to set to a specific value.
+# Note that TZ is handled separately by the timezone runtime option
+# and TIMEZONE_DEFAULT buildtime option.
+
+# keep_environment = ^LDAP
+# add_environment = PATH=/usr/bin::/bin
+
+

 
 ######################################################################
 #                       ACL CONFIGURATION                            #
 
 ######################################################################
 #                       ACL CONFIGURATION                            #


@@ -258,6 +404,7 @@ acl_check_rcpt:
   # testing for an empty sending host field.
 
   accept  hosts = :
   # testing for an empty sending host field.
 
   accept  hosts = :

+          control = dkim_disable_verify

 
   #############################################################################
   # The following section of the ACL is concerned with local parts that contain
 
   #############################################################################
   # The following section of the ACL is concerned with local parts that contain


@@ -315,6 +462,20 @@ acl_check_rcpt:
 
   require verify        = sender
 
 
   require verify        = sender
 

+  # Reject all RCPT commands after too many bad recipients
+  # This is partly a defense against spam abuse and partly attacker abuse.
+  # Real senders should manage, by the time they get to 10 RCPT directives,
+  # to have had at least half of them be real addresses.
+  #
+  # This is a lightweight check and can protect you against repeated
+  # invocations of more heavy-weight checks which would come after it.
+
+  deny    condition     = ${if and {\
+                        {>{$rcpt_count}{10}}\
+                        {<{$recipients_count}{${eval:$rcpt_count/2}}} }}
+          message       = Rejected for too many bad recipients
+          logwrite      = REJECT [$sender_host_address]: bad recipient count high [${eval:$rcpt_count-$recipients_count}]
+

   # Accept if the message comes from one of the hosts for which we are an
   # outgoing relay. It is assumed that such hosts are most likely to be MUAs,
   # so we set control=submission to make Exim treat the message as a
   # Accept if the message comes from one of the hosts for which we are an
   # outgoing relay. It is assumed that such hosts are most likely to be MUAs,
   # so we set control=submission to make Exim treat the message as a


@@ -336,6 +497,7 @@ acl_check_rcpt:
 
   accept  hosts         = +relay_from_hosts
           control       = submission
 
   accept  hosts         = +relay_from_hosts
           control       = submission

+          control       = dkim_disable_verify

 
   # Accept if the message arrived over an authenticated connection, from
   # any host. Again, these messages are usually from MUAs, so recipient
 
   # Accept if the message arrived over an authenticated connection, from
   # any host. Again, these messages are usually from MUAs, so recipient


@@ -344,6 +506,22 @@ acl_check_rcpt:
 
   accept  authenticated = *
           control       = submission
 
   accept  authenticated = *
           control       = submission

+          control       = dkim_disable_verify
+
+  # Insist that any other recipient address that we accept is either in one of
+  # our local domains, or is in a domain for which we explicitly allow
+  # relaying. Any other domain is rejected as being unacceptable for relaying.
+
+  require message = relay not permitted
+          domains = +local_domains : +relay_to_domains
+
+  # We also require all accepted addresses to be verifiable. This check will
+  # do local part verification for local domains, but only check the domain
+  # for remote domains. The only way to check local parts for the remote
+  # relay domains is to use a callout (add /callout), but please read the
+  # documentation about callouts before doing this.
+
+  require verify = recipient

 
   #############################################################################
   # There are no default checks on DNS black lists because the domains that
 
   #############################################################################
   # There are no default checks on DNS black lists because the domains that


@@ -351,12 +529,12 @@ acl_check_rcpt:
   # examples of how you can get Exim to perform a DNS black list lookup at this
   # point. The first one denies, whereas the second just warns.
   #
   # examples of how you can get Exim to perform a DNS black list lookup at this
   # point. The first one denies, whereas the second just warns.
   #

-  # deny    message       = rejected because $sender_host_address is in a black list at $dnslist_domain\n$dnslist_text
-  #         dnslists      = black.list.example
+  # deny    dnslists      = black.list.example
+  #         message       = rejected because $sender_host_address is in a black list at $dnslist_domain\n$dnslist_text

   #
   #

-  # warn    message       = X-Warning: $sender_host_address is in a black list at $dnslist_domain
+  # warn    dnslists      = black.list.example
+  #         add_header    = X-Warning: $sender_host_address is in a black list at $dnslist_domain

   #         log_message   = found in $dnslist_domain
   #         log_message   = found in $dnslist_domain

-  #         dnslists      = black.list.example

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


@@ -370,27 +548,44 @@ acl_check_rcpt:
   # require verify = csa
   #############################################################################
 
   # require verify = csa
   #############################################################################
 

-  # Accept if the address is in a local domain, but only if the recipient can
-  # be verified. Otherwise deny. The "endpass" line is the border between
-  # passing on to the next ACL statement (if tests above it fail) or denying
-  # access (if tests below it fail).
+  #############################################################################
+  # If doing per-user content filtering then recipients with filters different
+  # to the first recipient must be deferred unless the sender talks PRDR.
+  #
+  # defer  !condition     = $prdr_requested
+  #        condition      = ${if > {0}{$recipients_count}}
+  #        condition      = ${if !eq {$acl_m_content_filter} \
+  #                                  {${lookup PER_RCPT_CONTENT_FILTER}}}
+  # warn   !condition     = $prdr_requested
+  #        condition      = ${if > {0}{$recipients_count}}
+  #        set acl_m_content_filter = ${lookup PER_RCPT_CONTENT_FILTER}
+  #############################################################################

 
 

-  accept  domains       = +local_domains
-          endpass
-          verify        = recipient
+  # At this point, the address has passed all the checks that have been
+  # configured, so we accept it unconditionally.

 
 

-  # Accept if the address is in a domain for which we are an incoming relay,
-  # but again, only if the recipient can be verified.
+  accept

 
 

-  accept  domains       = +relay_to_domains
-          endpass
-          verify        = recipient

 
 

-  # Reaching the end of the ACL causes a "deny", but we might as well give
-  # an explicit message.
+# This ACL is used once per recipient, for multi-recipient messages, if
+# we advertised PRDR.  It can be used to perform receipient-dependent
+# header- and body- based filtering and rejections.
+# We set a variable to record that PRDR was active used, so that checking
+# in the data ACL can be skipped.

 
 

-  deny    message       = relay not permitted
+.ifdef _HAVE_PRDR
+acl_check_prdr:
+  warn  set acl_m_did_prdr = y

 
 

+  #############################################################################
+  # do lookup on filtering, with $local_part@$domain, deny on filter match
+  #
+  # deny      set acl_m_content_filter = ${lookup PER_RCPT_CONTENT_FILTER}
+  #           condition    = ...
+  #############################################################################
+
+  accept
+.endif

 
 # This ACL is used after the contents of a message have been received. This
 # is the ACL in which you can test a message's headers or body, and in
 
 # This ACL is used after the contents of a message have been received. This
 # is the ACL in which you can test a message's headers or body, and in


@@ -402,21 +597,47 @@ acl_check_rcpt:
 
 acl_check_data:
 
 
 acl_check_data:
 

+  # Deny if the message contains an overlong line.  Per the standards
+  # we should never receive one such via SMTP.
+  #
+  deny    condition  = ${if > {$max_received_linelength}{998}}
+          message    = maximum allowed line length is 998 octets, \
+                       got $max_received_linelength
+
+  # Deny if the headers contain badly-formed addresses.
+  #
+  deny    !verify =     header_syntax
+          message =     header syntax
+          log_message = header syntax ($acl_verify_message)
+

   # Deny if the message contains a virus. Before enabling this check, you
   # must install a virus scanner and set the av_scanner option above.
   #
   # Deny if the message contains a virus. Before enabling this check, you
   # must install a virus scanner and set the av_scanner option above.
   #

-  # deny    malware   = *
-  #         message   = This message contains a virus ($malware_name).
+  # deny    malware    = *
+  #         message    = This message contains a virus ($malware_name).

 
   # Add headers to a message if it is judged to be spam. Before enabling this,
   # you must install SpamAssassin. You may also need to set the spamd_address
   # option above.
   #
 
   # Add headers to a message if it is judged to be spam. Before enabling this,
   # you must install SpamAssassin. You may also need to set the spamd_address
   # option above.
   #

-  # warn    spam      = nobody
-  #         message   = X-Spam_score: $spam_score\n\
-  #                     X-Spam_score_int: $spam_score_int\n\
-  #                     X-Spam_bar: $spam_bar\n\
-  #                     X-Spam_report: $spam_report
+  # warn    spam       = nobody
+  #         add_header = X-Spam_score: $spam_score\n\
+  #                      X-Spam_score_int: $spam_score_int\n\
+  #                      X-Spam_bar: $spam_bar\n\
+  #                      X-Spam_report: $spam_report
+
+  #############################################################################
+  # No more tests if PRDR was actively used.
+  # accept   condition  = ${if def:acl_m_did_prdr}
+  #
+  # To get here, all message recipients must have identical per-user
+  # content filtering (enforced by RCPT ACL).  Do lookup for filter
+  # and deny on match.
+  #
+  # deny      set acl_m_content_filter = ${lookup PER_RCPT_CONTENT_FILTER}
+  #           condition    = ...
+  #############################################################################
+

 
   # Accept the message.
 
 
   # Accept the message.
 


@@ -449,6 +670,25 @@ begin routers
 #   transport = remote_smtp
 
 
 #   transport = remote_smtp
 
 

+# This router can be used when you want to send all mail to a
+# server which handles DNS lookups for you; an ISP will typically run such
+# a server for their customers.  The hostname in route_data comes from the
+# macro defined at the top of the file.  If not defined, then we'll use the
+# dnslookup router below instead.
+# Beware that the hostname is specified again in the Transport.
+
+.ifdef ROUTER_SMARTHOST
+
+smarthost:
+  driver = manualroute
+  domains = ! +local_domains
+  transport = smarthost_smtp
+  route_data = ROUTER_SMARTHOST
+  ignore_target_hosts = <; 0.0.0.0 ; 127.0.0.0/8 ; ::1
+  no_more
+
+.else
+

 # This router routes addresses that are not in local domains by doing a DNS
 # lookup on the domain name. The exclamation mark that appears in "domains = !
 # +local_domains" is a negating operator, that is, it can be read as "not". The
 # This router routes addresses that are not in local domains by doing a DNS
 # lookup on the domain name. The exclamation mark that appears in "domains = !
 # +local_domains" is a negating operator, that is, it can be read as "not". The


@@ -467,8 +707,14 @@ dnslookup:
   domains = ! +local_domains
   transport = remote_smtp
   ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8
   domains = ! +local_domains
   transport = remote_smtp
   ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8

+# if ipv6-enabled then instead use:
+# ignore_target_hosts = <; 0.0.0.0 ; 127.0.0.0/8 ; ::1

   no_more
 
   no_more
 

+# This closes the ROUTER_SMARTHOST ifdef around the choice of routing for
+# off-site mail.
+.endif
+

 
 # The remaining routers handle addresses in the local domain(s), that is those
 # domains that are defined by "domainlist local_domains" above.
 
 # The remaining routers handle addresses in the local domain(s), that is those
 # domains that are defined by "domainlist local_domains" above.


@@ -509,16 +755,18 @@ system_aliases:
 # file starts with the string "# Exim filter" or "# Sieve filter", uncomment
 # the "allow_filter" option.
 
 # file starts with the string "# Exim filter" or "# Sieve filter", uncomment
 # the "allow_filter" option.
 

-# If you want this router to treat local parts with suffixes introduced by "-"
-# or "+" characters as if the suffixes did not exist, uncomment the two local_
-# part_suffix options. Then, for example, xxxx-foo@your.domain will be treated
-# in the same way as xxxx@your.domain by this router. You probably want to make
-# the same change to the localuser router.
-

 # The no_verify setting means that this router is skipped when Exim is
 # verifying addresses. Similarly, no_expn means that this router is skipped if
 # Exim is processing an EXPN command.
 
 # The no_verify setting means that this router is skipped when Exim is
 # verifying addresses. Similarly, no_expn means that this router is skipped if
 # Exim is processing an EXPN command.
 

+# If you want this router to treat local parts with suffixes introduced by "-"
+# or "+" characters as if the suffixes did not exist, uncomment the two local_
+# part_suffix options. Then, for example, xxxx-foo@your.domain will be treated
+# in the same way as xxxx@your.domain by this router. Because this router is
+# not used for verification, if you choose to uncomment those options, then you
+# will *need* to make the same change to the localuser router.  (There are
+# other approaches, if this is undesirable, but they add complexity).
+

 # 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
 # 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


@@ -578,6 +826,49 @@ begin transports
 
 remote_smtp:
   driver = smtp
 
 remote_smtp:
   driver = smtp

+.ifdef _HAVE_TLS_RESUME
+  tls_resumption_hosts = *
+.endif
+
+
+# This transport is used for delivering messages to a smarthost, if the
+# smarthost router is enabled.  This starts from the same basis as
+# "remote_smtp" but then turns on various security options, because
+# we assume that if you're told "use smarthost.example.org as the smarthost"
+# then there will be TLS available, with a verifiable certificate for that
+# hostname, using decent TLS.
+
+smarthost_smtp:
+  driver = smtp
+  multi_domain
+  #
+.ifdef _HAVE_TLS
+  # Comment out any of these which you have to, then file a Support
+  # request with your smarthost provider to get things fixed:
+  hosts_require_tls = *
+  tls_verify_hosts = *
+  # As long as tls_verify_hosts is enabled this will have no effect,
+  # but if you have to comment it out then this will at least log whether
+  # you succeed or not:
+  tls_try_verify_hosts = *
+  #
+  # The SNI name should match the name which we'll expect to verify;
+  # many mail systems don't use SNI and this doesn't matter, but if it does,
+  # we need to send a name which the remote site will recognize.
+  # This _should_ be the name which the smarthost operators specified as
+  # the hostname for sending your mail to.
+  tls_sni = ROUTER_SMARTHOST
+  #
+.ifdef _HAVE_OPENSSL
+  tls_require_ciphers = HIGH:!aNULL:@STRENGTH
+.endif
+.ifdef _HAVE_GNUTLS
+  tls_require_ciphers = SECURE192:-VERS-SSL3.0:-VERS-TLS1.0:-VERS-TLS1.1
+.endif
+.ifdef _HAVE_TLS_RESUME
+  tls_resumption_hosts = *
+.endif
+.endif

 
 
 # This transport is used for local delivery to user mailboxes in traditional
 
 
 # This transport is used for local delivery to user mailboxes in traditional


@@ -589,7 +880,7 @@ remote_smtp:
 
 local_delivery:
   driver = appendfile
 
 local_delivery:
   driver = appendfile

-  file = /var/mail/$local_part
+  file = /var/mail/$local_part_data

   delivery_date_add
   envelope_to_add
   return_path_add
   delivery_date_add
   envelope_to_add
   return_path_add


@@ -640,6 +931,12 @@ begin retry
 # hours, then retries every 6 hours until 4 days have passed since the first
 # failed delivery.
 
 # hours, then retries every 6 hours until 4 days have passed since the first
 # failed delivery.
 

+# WARNING: If you do not have any retry rules at all (this section of the
+# configuration is non-existent or empty), Exim will not do any retries of
+# messages that fail to get delivered at the first attempt. The effect will
+# be to treat temporary errors as permanent. Therefore, DO NOT remove this
+# retry rule unless you really don't want any retries.
+

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


@@ -661,10 +958,49 @@ begin rewrite
 #                   AUTHENTICATION CONFIGURATION                     #
 ######################################################################
 
 #                   AUTHENTICATION CONFIGURATION                     #
 ######################################################################
 

-# There are no authenticator specifications in this default configuration file.
+# The following authenticators support plaintext username/password
+# authentication using the standard PLAIN mechanism and the traditional
+# but non-standard LOGIN mechanism, with Exim acting as the server.
+# PLAIN and LOGIN are enough to support most MUA software.
+#
+# These authenticators are not complete: you need to change the
+# server_condition settings to specify how passwords are verified.
+# They are set up to offer authentication to the client only if the
+# connection is encrypted with TLS, so you also need to add support
+# for TLS. See the global configuration options section at the start
+# of this file for more about TLS.
+#
+# The default RCPT ACL checks for successful authentication, and will accept
+# messages from authenticated users from anywhere on the Internet.

 
 begin authenticators
 
 
 begin authenticators
 

+# PLAIN authentication has no server prompts. The client sends its
+# credentials in one lump, containing an authorization ID (which we do not
+# use), an authentication ID, and a password. The latter two appear as
+# $auth2 and $auth3 in the configuration and should be checked against a
+# valid username and password. In a real configuration you would typically
+# use $auth2 as a lookup key, and compare $auth3 against the result of the
+# lookup, perhaps using the crypteq{}{} condition.
+
+#PLAIN:
+#  driver                     = plaintext
+#  server_set_id              = $auth2
+#  server_prompts             = :
+#  server_condition           = Authentication is not yet configured
+#  server_advertise_condition = ${if def:tls_in_cipher }
+
+# LOGIN authentication has traditional prompts and responses. There is no
+# authorization ID in this mechanism, so unlike PLAIN the username and
+# password are $auth1 and $auth2. Apart from that you can use the same
+# server_condition setting for both authenticators.
+
+#LOGIN:
+#  driver                     = plaintext
+#  server_set_id              = $auth1
+#  server_prompts             = <| Username: | Password:
+#  server_condition           = Authentication is not yet configured
+#  server_advertise_condition = ${if def:tls_in_cipher }

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