Logging: server pipelining offer but no uptake

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

diff --git a/src/src/configure.default b/src/src/configure.default
index d6aaa5ec394d162602206c4b28dc46e234b1bfa4..4209ae8c11a9964f14df78ceb74271e41a3cfd9c 100644 (file)
--- a/src/src/configure.default
+++ b/src/src/configure.default
@@ -40,6 +40,7 @@
 ######################################################################
 #                    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


@@ -56,7 +57,9 @@
 
 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,


@@ -91,12 +94,13 @@ 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
 
 # All three of these lists may contain many different kinds of item, including
 # wildcarded names, regular expressions, and file lookups. See the reference


@@ -149,6 +153,9 @@ acl_smtp_data = acl_check_data
 # tls_certificate = /etc/ssl/exim.crt
 # tls_privatekey = /etc/ssl/exim.pem
 
 # tls_certificate = /etc/ssl/exim.crt
 # tls_privatekey = /etc/ssl/exim.pem
 

+# For OpenSSL, prefer EC- over RSA-authenticated ciphers
+# tls_require_ciphers = ECDSA:RSA:!COMPLEMENTOFDEFAULT
+

 # 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.
 # 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.


@@ -218,18 +225,33 @@ 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 SMTP sessions. (The default was
-# reduced from 30s to 5s for release 4.61.)
+# 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 = 5s
+
+# 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.
+#
+prdr_enable = true

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


@@ -245,6 +267,13 @@ rfc1413_query_timeout = 5s
 # 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


@@ -304,6 +333,25 @@ timeout_frozen_after = 7d
 # because of some popular, yet buggy, mail composition software.
 
 
 # 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                            #
 #         Specifies access control lists for incoming SMTP mail      #
 ######################################################################
 #                       ACL CONFIGURATION                            #
 #         Specifies access control lists for incoming SMTP mail      #


@@ -411,6 +459,11 @@ acl_check_rcpt:
           control       = submission
           control       = dkim_disable_verify
 
           control       = submission
           control       = dkim_disable_verify
 

+  # Insist that a HELO/EHLO was accepted.
+
+  require message      = nice hosts say HELO first
+          condition    = ${if def:sender_helo_name}
+

   # 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.
   # 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.


@@ -467,6 +520,19 @@ 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    message    = maximum allowed line length is 998 octets, \
+                       got $max_received_linelength
+          condition  = ${if > {$max_received_linelength}{998}}
+
+  # 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.
   #


@@ -532,9 +598,27 @@ 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
+  dnssec_request_domains = *

   no_more
 
 
   no_more
 
 

+# This alternative 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.  If you uncomment "smarthost" then you
+# should comment out "dnslookup" above.  Setting a real hostname in route_data
+# wouldn't hurt either.
+
+# smarthost:
+#   driver = manualroute
+#   domains = ! +local_domains
+#   transport = smarthost_smtp
+#   route_data = MAIL.HOSTNAME.FOR.CENTRAL.SERVER.EXAMPLE
+#   ignore_target_hosts = <; 0.0.0.0 ; 127.0.0.0/8 ; ::1
+#   no_more
+
+

 # 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.
 


@@ -574,16 +658,18 @@ 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


@@ -640,9 +726,49 @@ begin transports
 
 
 # This transport is used for delivering messages over SMTP connections.
 
 
 # This transport is used for delivering messages over SMTP connections.

+# Refuse to send any message with over-long lines, which could have
+# been received other than via SMTP. The use of message_size_limit to
+# enforce this is a red herring.

 
 remote_smtp:
   driver = smtp
 
 remote_smtp:
   driver = smtp

+  message_size_limit = ${if > {$max_received_linelength}{998} {1}{0}}
+.ifdef _HAVE_DANE
+  dnssec_request_domains = *
+  hosts_try_dane = *
+.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
+  message_size_limit = ${if > {$max_received_linelength}{998} {1}{0}}
+  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_sni = $host
+  tls_verify_hosts = *
+  # As long as tls_verify_hosts is enabled, this won't matter, but if you
+  # have to comment it out then this will at least log whether you succeed
+  # or not:
+  tls_try_verify_hosts = *
+  #
+.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
+.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


@@ -762,7 +888,7 @@ begin authenticators
 #  server_set_id              = $auth2
 #  server_prompts             = :
 #  server_condition           = Authentication is not yet configured
 #  server_set_id              = $auth2
 #  server_prompts             = :
 #  server_condition           = Authentication is not yet configured

-#  server_advertise_condition = ${if def:tls_cipher }
+#  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
 
 # LOGIN authentication has traditional prompts and responses. There is no
 # authorization ID in this mechanism, so unlike PLAIN the username and


@@ -774,7 +900,7 @@ begin authenticators
 #  server_set_id              = $auth1
 #  server_prompts             = <| Username: | Password:
 #  server_condition           = Authentication is not yet configured
 #  server_set_id              = $auth1
 #  server_prompts             = <| Username: | Password:
 #  server_condition           = Authentication is not yet configured

-#  server_advertise_condition = ${if def:tls_cipher }
+#  server_advertise_condition = ${if def:tls_in_cipher }

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