X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/8e53a4fc1a0790138a5b460da7d9c621f6d32622..exim-4_89_RC5:/doc/doc-docbook/spec.xfpt

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index ce64fd405..919b36a14 100644
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -45,14 +45,14 @@
 . Update the Copyright year (only) when changing content.
 . /////////////////////////////////////////////////////////////////////////////
 
-.set previousversion "4.87"
+.set previousversion "4.88"
 .include ./local_params
 
 .set ACL "access control lists (ACLs)"
 .set I   "    "
 
 .macro copyyear
-2016
+2017
 .endmacro
 
 . /////////////////////////////////////////////////////////////////////////////
@@ -371,13 +371,11 @@ contributors.
 .section "Exim documentation" "SECID1"
 . Keep this example change bar when updating the documentation!
 
-.new
 .cindex "documentation"
 This edition of the Exim specification applies to version &version() of Exim.
 Substantive changes from the &previousversion; edition are marked in some
 renditions of the document; this paragraph is so marked if the rendition is
 capable of showing a change indicator.
-.wen
 
 This document is very much a reference manual; it is not a tutorial. The reader
 is expected to have some familiarity with the SMTP mail transfer protocol and
@@ -436,6 +434,7 @@ directory are:
 .row &_filter.txt_&          "specification of the filter language"
 .row &_Exim3.upgrade_&       "upgrade notes from release 2 to release 3"
 .row &_Exim4.upgrade_&       "upgrade notes from release 3 to release 4"
+.row &_openssl.txt_&         "installing a current OpenSSL release"
 .endtable
 
 The main specification and the specification of the filtering language are also
@@ -3827,13 +3826,11 @@ This option is not intended for use by external callers. It is used internally
 by Exim in conjunction with the &%-MC%& option. It signifies that the
 remote host supports the ESMTP &_DSN_& extension.
 
-.new
 .vitem &%-MCG%&
 .oindex "&%-MCG%&"
 This option is not intended for use by external callers. It is used internally
 by Exim in conjunction with the &%-MC%& option. It signifies that an
 alternate queue is used, named by the following option.
-.wen
 
 .vitem &%-MCP%&
 .oindex "&%-MCP%&"
@@ -4381,9 +4378,7 @@ relax this restriction (and also the same requirement for the &%-M%&, &%-R%&,
 and &%-S%& options).
 
 .cindex "queue runner" "description of operation"
-.new
 If other commandline options do not specify an action,
-.wen
 the &%-q%& option starts one queue runner process. This scans the queue of
 waiting messages, and runs a delivery process for each one in turn. It waits
 for each delivery process to finish before starting the next one. A delivery
@@ -4469,7 +4464,6 @@ The &'l'& (the letter &"ell"&) flag specifies that only local deliveries are to
 be done. If a message requires any remote deliveries, it remains on the queue
 for later delivery.
 
-.new
 .vitem &%-q[q][i][f[f]][l][G<name>[/<time>]]]%&
 .oindex "&%-qG%&"
 .cindex queue named
@@ -4481,15 +4475,14 @@ The name should not contain a &'/'& character.
 For a periodic queue run (see below)
 append to the name a slash and a time value.
 
-If other commandline options speicify an action, a &'-qG<name>'& option
+If other commandline options specify an action, a &'-qG<name>'& option
 will specify a queue to operate on.
 For example:
 .code
 exim -bp -qGquarantine
-mailq -qGquarantime
+mailq -qGquarantine
 exim -qGoffpeak -Rf @special.domain.example
 .endd
-.wen
 
 .vitem &%-q%&<&'qflags'&>&~<&'start&~id'&>&~<&'end&~id'&>
 When scanning the queue, Exim can be made to skip over messages whose ids are
@@ -4926,8 +4919,12 @@ using this syntax:
 .endd
 on a line by itself. Double quotes round the file name are optional. If you use
 the first form, a configuration error occurs if the file does not exist; the
-second form does nothing for non-existent files. In all cases, an absolute file
+second form does nothing for non-existent files.
+.new
+The first form allows a relative name. It is resolved relative to
+the directory of the including file. For the second form an absolute file
 name is required.
+.wen
 
 Includes may be nested to any depth, but remember that Exim reads its
 configuration file often, so it is a good idea to keep them to a minimum.
@@ -5033,7 +5030,6 @@ address lists. In Exim 4 these are handled better by named lists &-- see
 section &<<SECTnamedlists>>&.
 
 
-.new
 .section "Builtin macros" "SECTbuiltinmacros"
 Exim defines some macros depending on facilities available, which may
 differ due to build-time definitions and from one release to another.
@@ -5043,15 +5039,20 @@ They can be used to conditionally include parts of a configuration
 
 The following classes of macros are defined:
 .display
-&` _HAVE_                     `&  build-time defines
-&` _DRVR_AUTH_                `&  authenticator drivers
-&` _DRVR_RTR_                 `&  router drivers
-&` _DRVR_TPT_                 `&  transport drivers
-&` _OPT_                      `&  configuration option support
+&` _HAVE_*                    `&  build-time defines
+&` _DRIVER_ROUTER_*           `&  router drivers
+&` _DRIVER_TRANSPORT_*        `&  transport drivers
+&` _DRIVER_AUTHENTICATOR_*    `&  authenticator drivers
+&` _OPT_MAIN_*                `&  main config options
+&` _OPT_ROUTERS_*             `&  generic router options
+&` _OPT_TRANSPORTS_*          `&  generic transport options
+&` _OPT_AUTHENTICATORS_*      `&  generic authenticator options
+&` _OPT_ROUTER_*_*            `&  private router options
+&` _OPT_TRANSPORT_*_*         `&  private transport options
+&` _OPT_AUTHENTICATOR_*_*     `&  private authenticator options
 .endd
 
 Use an &"exim -bP macros"& command to get the list of macros.
-.wen
 
 
 .section "Conditional skips in the configuration file" "SECID46"
@@ -5158,9 +5159,7 @@ hexadecimal number.
 
 If an integer value is followed by the letter K, it is multiplied by 1024; if
 it is followed by the letter M, it is multiplied by 1024x1024;
-.new
 if by the letter G, 1024x1024x1024.
-.wen
 When the values
 of integer option settings are output, values which are an exact multiple of
 1024 or 1024x1024 are sometimes, but not always, printed using the letters K
@@ -6290,9 +6289,7 @@ Exim supports the use of regular expressions in many of its options. It
 uses the PCRE regular expression library; this provides regular expression
 matching that is compatible with Perl 5. The syntax and semantics of
 regular expressions is discussed in
-.new
 online Perl manpages, in
-.wen
 many Perl reference books, and also in
 Jeffrey Friedl's &'Mastering Regular Expressions'&, which is published by
 O'Reilly (see &url(http://www.oreilly.com/catalog/regex2/)).
@@ -7113,7 +7110,7 @@ Retries for the dnsdb lookup can be controlled by a retry modifier.
 The form if &"retry_VAL"& where VAL is an integer.
 The default count is set by the main configuration option &%dns_retry%&.
 
-.cindex cacheing "of dns lookup"
+.cindex caching "of dns lookup"
 .cindex TTL "of dns lookup"
 .cindex DNS TTL
 Dnsdb lookup results are cached within a single process (and its children).
@@ -7840,10 +7837,8 @@ domain, host, address and local part lists.
 .cindex "expansion" "of lists"
 Each list is expanded as a single string before it is used.
 
-.new
 &'Exception: the router headers_remove option, where list-item
 splitting is done before string-expansion.'&
-.wen
 
 The result of
 expansion must be a list, possibly containing empty items, which is split up
@@ -9110,7 +9105,7 @@ If the ACL returns defer the result is a forced-fail.  Otherwise the expansion f
 
 .vitem "&*${certextract{*&<&'field'&>&*}{*&<&'certificate'&>&*}&&&
        {*&<&'string2'&>&*}{*&<&'string3'&>&*}}*&"
-.cindex "expansion" "extracting cerificate fields"
+.cindex "expansion" "extracting certificate fields"
 .cindex "&%certextract%&" "certificate fields"
 .cindex "certificate" "extracting fields"
 The <&'certificate'&> must be a variable of type certificate.
@@ -9427,12 +9422,19 @@ message, and any that are added by an ACL statement or by a system
 filter. Header lines that are added to a particular copy of a message by a
 router or transport are not accessible.
 
-For incoming SMTP messages, no header lines are visible in ACLs that are obeyed
-before the DATA ACL, because the header structure is not set up until the
-message is received. Header lines that are added in a RCPT ACL (for example)
+For incoming SMTP messages, no header lines are visible in
+.new
+ACLs that are obeyed before the data phase completes,
+.wen
+because the header structure is not set up until the message is received.
+They are visible in DKIM, PRDR and DATA ACLs.
+Header lines that are added in a RCPT ACL (for example)
 are saved until the message's incoming header lines are available, at which
-point they are added. When a DATA ACL is running, however, header lines added
-by earlier ACLs are visible.
+point they are added.
+.new
+When any of the above ACLs ar
+.wen
+running, however, header lines added by earlier ACLs are visible.
 
 Upper case and lower case letters are synonymous in header names. If the
 following character is white space, the terminating colon may be omitted, but
@@ -10121,7 +10123,6 @@ Last:user@example.com
 user@example.com
 .endd
 
-.new
 .vitem &*${base32:*&<&'digits'&>&*}*&
 .cindex "&%base32%& expansion item"
 .cindex "expansion" "conversion to base 32"
@@ -10134,7 +10135,6 @@ Only lowercase letters are used.
 .cindex "expansion" "conversion to base 32"
 The string must consist entirely of base-32 digits.
 The number is converted to decimal and output as a string.
-.wen
 
 .vitem &*${base62:*&<&'digits'&>&*}*&
 .cindex "&%base62%& expansion item"
@@ -10187,14 +10187,12 @@ escape sequences starting with a backslash. Whether characters with the most
 significant bit set (so-called &"8-bit characters"&) count as printing or not
 is controlled by the &%print_topbitchars%& option.
 
-.new
 .vitem &*${escape8bit:*&<&'string'&>&*}*&
 .cindex "expansion" "escaping 8-bit characters"
 .cindex "&%escape8bit%& expansion item"
 If the string contains and characters with the most significant bit set,
 they are converted to escape sequences starting with a backslash.
 Backslashes and DEL characters are also converted.
-.wen
 
 
 .vitem &*${eval:*&<&'string'&>&*}*&&~and&~&*${eval10:*&<&'string'&>&*}*&
@@ -10582,17 +10580,14 @@ returns the SHA-1 hash fingerprint of the certificate.
 .cindex certificate fingerprint
 .cindex "expansion" "SHA-256 hashing"
 .cindex "&%sha256%& expansion item"
-.new
 The &%sha256%& operator computes the SHA-256 hash value of the string
 and returns
 it as a 64-digit hexadecimal number, in which any letters are in upper case.
-.wen
 
 If the string is a single variable of type certificate,
 returns the SHA-256 hash fingerprint of the certificate.
 
 
-.new
 .vitem &*${sha3:*&<&'string'&>&*}*& &&&
        &*${sha3_<n>:*&<&'string'&>&*}*&
 .cindex "SHA3 hash"
@@ -10608,7 +10603,6 @@ with 256 being the default.
 
 The &%sha3%& expansion item is only supported if Exim has been
 compiled with GnuTLS 3.5.0 or later.
-.wen
 
 
 .vitem &*${stat:*&<&'string'&>&*}*&
@@ -12216,7 +12210,7 @@ normally the gid of the Exim user.
 .cindex "uid (user id)" "of originating user"
 .cindex "sender" "uid"
 .vindex "&$caller_uid$&"
-.vindex "&$originaltor_uid$&"
+.vindex "&$originator_uid$&"
 The value of &$caller_uid$& that was set when the message was received. For
 messages received via the command line, this is the uid of the sending user.
 For messages received by SMTP over TCP/IP, this is normally the uid of the Exim
@@ -12257,16 +12251,14 @@ a single-component name, Exim calls &[gethostbyname()]& (or
 qualified host name. See also &$smtp_active_hostname$&.
 
 
-.new
 .vitem &$proxy_external_address$& &&&
        &$proxy_external_port$& &&&
        &$proxy_local_address$& &&&
        &$proxy_local_port$& &&&
        &$proxy_session$&
 These variables are only available when built with Proxy Protocol
-or Socks5 support
+or SOCKS5 support.
 For details see chapter &<<SECTproxyInbound>>&.
-.wen
 
 .vitem &$prdr_requested$&
 .cindex "PRDR" "variable for"
@@ -12297,13 +12289,11 @@ The value set for the &%qualify_domain%& option in the configuration file.
 The value set for the &%qualify_recipient%& option in the configuration file,
 or if not set, the value of &$qualify_domain$&.
 
-.new
 .vitem &$queue_name$&
 .vindex &$queue_name$&
 .cindex "named queues"
 .cindex queues named
 The name of the spool queue in use; empty for the default queue.
-.wen
 
 .vitem &$rcpt_count$&
 .vindex "&$rcpt_count$&"
@@ -12617,6 +12607,13 @@ validating resolver (e.g. unbound, or bind with suitable configuration).
 If you have changed &%host_lookup_order%& so that &`bydns`& is not the first
 mechanism in the list, then this variable will be false.
 
+.new
+This requires that your system resolver library support EDNS0 (and that
+DNSSEC flags exist in the system headers).  If the resolver silently drops
+all EDNS0 options, then this will have no effect.  OpenBSD's asr resolver
+is known to currently ignore EDNS0, documented in CAVEATS of asr_run(3).
+.wen
+
 
 .vitem &$sender_host_name$&
 .vindex "&$sender_host_name$&"
@@ -12838,7 +12835,7 @@ If TLS has not been negotiated, the value will be 0.
 
 .vitem &$tls_in_ourcert$&
 .vindex "&$tls_in_ourcert$&"
-.cindex certificate veriables
+.cindex certificate variables
 This variable refers to the certificate presented to the peer of an
 inbound connection when the message was received.
 It is only useful as the argument of a
@@ -13104,16 +13101,14 @@ overriding the setting of &%perl_at_start%&.
 There is also a command line option &%-pd%& (for delay) which suppresses the
 initial startup, even if &%perl_at_start%& is set.
 
-.new
 .ilist
 .oindex "&%perl_taintmode%&"
 .cindex "Perl" "taintmode"
 To provide more security executing Perl code via the embedded Perl
-interpeter, the &%perl_taintmode%& option can be set. This enables the
+interpreter, the &%perl_taintmode%& option can be set. This enables the
 taint mode of the Perl interpreter. You are encouraged to set this
 option to a true value. To avoid breaking existing installations, it
 defaults to false.
-.wen
 
 
 .section "Calling Perl subroutines" "SECID86"
@@ -14030,6 +14025,7 @@ acknowledgment is sent. See chapter &<<CHAPACL>>& for further details.
 .option acl_smtp_dkim main string&!! unset
 .cindex DKIM "ACL for"
 This option defines the ACL that is run for each DKIM signature
+(by default, or as specified in the dkim_verify_signers option)
 of a received message.
 See chapter &<<CHAPdkim>>& for further details.
 
@@ -14346,15 +14342,11 @@ $primary_hostname-$tod_epoch-testing
 See section &<<CALLaddparcall>>& for details of how this value is used.
 
 
-.new
 .option check_log_inodes main integer 100
-.wen
 See &%check_spool_space%& below.
 
 
-.new
 .option check_log_space main integer 10M
-.wen
 See &%check_spool_space%& below.
 
 .oindex "&%check_rfc2047_length%&"
@@ -14369,15 +14361,11 @@ of the RFC, generates overlong encoded words. If &%check_rfc2047_length%& is
 set false, Exim recognizes encoded words of any length.
 
 
-.new
 .option check_spool_inodes main integer 100
-.wen
 See &%check_spool_space%& below.
 
 
-.new
 .option check_spool_space main integer 10M
-.wen
 .cindex "checking disk space"
 .cindex "disk space, checking"
 .cindex "spool directory" "checking space"
@@ -14423,21 +14411,17 @@ For non-SMTP input and for batched SMTP input, the test is done at start-up; on
 failure a message is written to stderr and Exim exits with a non-zero code, as
 it obviously cannot send an error message of any kind.
 
-.new
 There is a slight performance penalty for these checks.
 Versions of Exim preceding 4.88 had these disabled by default;
-high-rate intallations confident they will never run out of resources
+high-rate installations confident they will never run out of resources
 may wish to deliberately disable them.
-.wen
 
-.new
 .option chunking_advertise_hosts main "host list&!!" *
 .cindex CHUNKING advertisement
 .cindex "RFC 3030" "CHUNKING"
 The CHUNKING extension (RFC3030) will be advertised in the EHLO message to
 these hosts.
 Hosts may use the BDAT command as an alternate to DATA.
-.wen
 
 .option daemon_smtp_ports main string &`smtp`&
 .cindex "port" "for daemon"
@@ -14688,6 +14672,7 @@ record in the authoritative section is used instead.
 .option dns_use_edns0 main integer -1
 .cindex "DNS" "resolver options"
 .cindex "DNS" "EDNS0"
+.cindex "DNS" "OpenBSD
 If this option is set to a non-negative number then Exim will initialise the
 DNS resolver library to either use or not use EDNS0 extensions, overriding
 the system default. A value of 0 coerces EDNS0 off, a value of 1 coerces EDNS0
@@ -14695,6 +14680,12 @@ on.
 
 If the resolver library does not support EDNS0 then this option has no effect.
 
+.new
+OpenBSD's asr resolver routines are known to ignore the EDNS0 option; this
+means that DNSSEC will not work with Exim on that platform either, unless Exim
+is linked against an alternative DNS client library.
+.wen
+
 
 .option drop_cr main boolean false
 This is an obsolete option that is now a no-op. It used to affect the way Exim
@@ -14793,7 +14784,7 @@ not used.
 .option event_action main string&!! unset
 .cindex events
 This option declares a string to be expanded for Exim's events mechanism.
-For details see &<<CHAPevents>>&.
+For details see chapter &<<CHAPevents>>&.
 
 
 .option exim_group main string "compile-time configured"
@@ -15144,7 +15135,7 @@ If the &%smtp_connection%& log selector is not set, this option has no effect.
 .option hosts_proxy main "host list&!!" unset
 .cindex proxy "proxy protocol"
 This option enables use of Proxy Protocol proxies for incoming
-connections.  For details see &<<SECTproxyInbound>>&.
+connections.  For details see section &<<SECTproxyInbound>>&.
 
 
 .option hosts_treat_as_local main "domain list&!!" unset
@@ -15318,6 +15309,9 @@ connecting on a regular LDAP port.  This is the LDAP equivalent of SMTP's
 of SSL-on-connect.
 In the event of failure to negotiate TLS, the action taken is controlled
 by &%ldap_require_cert%&.
+.new
+This option is ignored for &`ldapi`& connections.
+.wen
 
 
 .option ldap_version main integer unset
@@ -16057,12 +16051,10 @@ the limit, allowing any number of simultaneous queue runner processes to be
 run. If you do not want queue runs to occur, omit the &%-q%&&'xx'& setting on
 the daemon's command line.
 
-.new
 .cindex queues named
 .cindex "named queues"
 To set limits for different named queues use
 an expansion depending on the &$queue_name$& variable.
-.wen
 
 .option queue_smtp_domains main "domain list&!!" unset
 .cindex "queueing incoming messages"
@@ -16736,7 +16728,7 @@ example, instead of &"Administrative prohibition"&, it might give:
 .option smtputf8_advertise_hosts main "host list&!!" *
 .cindex "SMTPUTF8" "advertising"
 When Exim is built with support for internationalised mail names,
-the availability therof is advertised in
+the availability thereof is advertised in
 response to EHLO only to those client hosts that match this option. See
 chapter &<<CHAPi18n>>& for details of Exim's support for internationalisation.
 
@@ -16893,6 +16885,9 @@ generates any deliveries to files or pipes, or any new mail messages, the
 appropriate &%system_filter_..._transport%& option(s) must be set, to define
 which transports are to be used. Details of this facility are given in chapter
 &<<CHAPsystemfilter>>&.
+.new
+A forced expansion failure results in no filter operation.
+.wen
 
 
 .option system_filter_directory_transport main string&!! unset
@@ -17025,10 +17020,8 @@ if the OpenSSL build supports TLS extensions and the TLS client sends the
 Server Name Indication extension, then this option and others documented in
 &<<SECTtlssni>>& will be re-expanded.
 
-.new
 If this option is unset or empty a fresh self-signed certificate will be
 generated for every connection.
-.wen
 
 .option tls_crl main string&!! unset
 .cindex "TLS" "server certificate revocation list"
@@ -17065,12 +17058,10 @@ larger prime than requested.
 The value of this option is expanded and indicates the source of DH parameters
 to be used by Exim.
 
-.new
 &*Note: The Exim Maintainers strongly recommend using a filename with site-generated
 local DH parameters*&, which has been supported across all versions of Exim.  The
 other specific constants available are a fallback so that even when
 "unconfigured", Exim can offer Perfect Forward Secrecy in older ciphersuites in TLS.
-.wen
 
 If &%tls_dhparam%& is a filename starting with a &`/`&,
 then it names a file from which DH
@@ -17089,7 +17080,6 @@ Exim will attempt to load a file from inside the spool directory.  If the file
 does not exist, Exim will attempt to create it.
 See section &<<SECTgnutlsparam>>& for further details.
 
-.new
 If Exim is using OpenSSL and this option is empty or unset, then Exim will load
 a default DH prime; the default is Exim-specific but lacks verifiable provenance.
 
@@ -17121,7 +17111,6 @@ of the later IKE values, which led into RFC7919 providing new fixed constants
 At this point, all of the "ike" values should be considered obsolete;
 they're still in Exim to avoid breaking unusual configurations, but are
 candidates for removal the next time we have backwards-incompatible changes.
-.wen
 
 The TLS protocol does not negotiate an acceptable size for this; clients tend
 to hard-drop connections if what is offered by the server is unacceptable,
@@ -20920,7 +20909,7 @@ resent to other recipients.
 .option event_action transports string&!! unset
 .cindex events
 This option declares a string to be expanded for Exim's events mechanism.
-For details see &<<CHAPevents>>&.
+For details see chapter &<<CHAPevents>>&.
 
 
 .option group transports string&!! "Exim group"
@@ -21035,7 +21024,7 @@ The control does not apply to shadow transports.
 
 .cindex "hints database" "transport concurrency control"
 Exim implements this control by means of a hints database in which a record is
-incremented whenever a transport process is beaing created. The record
+incremented whenever a transport process is being created. The record
 is decremented and possibly removed when the process terminates.
 Obviously there is scope for
 records to get left lying around if there is a system or program crash. To
@@ -23292,12 +23281,12 @@ message_suffix =
 &`\n`& to &`\r\n`& in &%message_suffix%&.
 
 
-.option path pipe string "see below"
-This option specifies the string that is set up in the PATH environment
-variable of the subprocess. The default is:
-.code
-/bin:/usr/bin
-.endd
+.option path pipe string&!! "/bin:/usr/bin"
+.new
+This option is expanded and
+.wen
+specifies the string that is set up in the PATH environment
+variable of the subprocess.
 If the &%command%& option does not yield an absolute path name, the command is
 sought in the PATH directories, in the usual way. &*Warning*&: This does not
 apply to a command specified as a transport filter.
@@ -23682,7 +23671,7 @@ of the message. Its value must not be zero. See also &%final_timeout%&.
 .option dkim_canon smtp string&!! unset
 .option dkim_strict smtp string&!! unset
 .option dkim_sign_headers smtp string&!! unset
-DKIM signing options.  For details see &<<SECDKIMSIGN>>&.
+DKIM signing options.  For details see section &<<SECDKIMSIGN>>&.
 
 
 .option delay_after_cutoff smtp boolean true
@@ -23993,21 +23982,18 @@ connects. If authentication fails, Exim will try to transfer the message
 unauthenticated. See also &%hosts_require_auth%&, and chapter
 &<<CHAPSMTPAUTH>>& for details of authentication.
 
-.new
 .option hosts_try_chunking smtp "host list&!!" *
 .cindex CHUNKING "enabling, in client"
 .cindex BDAT "SMTP command"
 .cindex "RFC 3030" "CHUNKING"
 This option provides a list of servers to which, provided they announce
 CHUNKING support, Exim will attempt to use BDAT commands rather than DATA.
-BDAT will not be used in conjuction with a transport filter.
-.wen
+BDAT will not be used in conjunction with a transport filter.
 
-.new
 .option hosts_try_fastopen smtp "host list!!" unset
-.option "fast open, TCP" "enabling, in client"
-.option "TCP Fast Open" "enabling, in client"
-.option "RFC 7413" "TCP Fast Open"
+.cindex "fast open, TCP" "enabling, in client"
+.cindex "TCP Fast Open" "enabling, in client"
+.cindex "RFC 7413" "TCP Fast Open"
 This option provides a list of servers to which, provided
 the facility is supported by this system, Exim will attempt to
 perform a TCP Fast Open.
@@ -24020,7 +24006,6 @@ as the initiator must present a cookie in the SYN segment.
 
 On (at least some) current Linux distributions the facility must be enabled
 in the kernel by the sysadmin before the support is usable.
-.wen
 
 .option hosts_try_prdr smtp "host list&!!" *
 .cindex "PRDR" "enabling, optional in client"
@@ -24192,7 +24177,7 @@ the use of the SIZE option altogether.
 .option socks_proxy smtp string&!! unset
 .cindex proxy SOCKS
 This option enables use of SOCKS proxies for connections made by the
-transport.  For details see &<<SECTproxySOCKS>>&.
+transport.  For details see section &<<SECTproxySOCKS>>&.
 
 
 .option tls_certificate smtp string&!! unset
@@ -25897,6 +25882,19 @@ turned into a permanent error if you wish. In the second case, Exim tries to
 deliver the message unauthenticated.
 .endlist
 
+.new
+Note that the hostlist test for whether to do authentication can be
+confused if name-IP lookups change between the time the peer is decided
+on and the transport running.  For example, with a manualroute
+router given a host name, and DNS "round-robin" use by that name: if
+the local resolver cache times out between the router and the transport
+running, the transport may get an IP for the name for its authentication
+check which does not match the connection peer IP.
+No authentication will then be done, despite the names being identical.
+
+For such cases use a separate transport which always authenticates.
+.wen
+
 .cindex "AUTH" "on MAIL command"
 When Exim has authenticated itself to a remote server, it adds the AUTH
 parameter to the MAIL commands it sends, if it has an authenticated sender for
@@ -26806,7 +26804,7 @@ tls:
 .endd
 This accepts a client certificate that is verifiable against any
 of your configured trust-anchors
-which usually means the full set of public CAs)
+(which usually means the full set of public CAs)
 and which has a SAN with a good account name.
 Note that the client cert is on the wire in-clear, including the SAN,
 whereas a plaintext SMTP AUTH done inside TLS is not.
@@ -27186,12 +27184,10 @@ rejected with a 554 error code.
 To enable TLS operations on a server, the &%tls_advertise_hosts%& option
 must be set to match some hosts. The default is * which matches all hosts.
 
-.new
 If this is all you do, TLS encryption will be enabled but not authentication -
 meaning that the peer has no assurance it is actually you he is talking to.
 You gain protection from a passive sniffer listening on the wire but not
 from someone able to intercept the communication.
-.wen
 
 Further protection requires some further configuration at the server end.
 
@@ -27570,11 +27566,9 @@ Great care should be taken to deal with matters of case, various injection
 attacks in the string (&`../`& or SQL), and ensuring that a valid filename
 can always be referenced; it is important to remember that &$tls_in_sni$& is
 arbitrary unverified data provided prior to authentication.
-.new
-Further, the initial cerificate is loaded before SNI is arrived, so
+Further, the initial certificate is loaded before SNI is arrived, so
 an expansion for &%tls_certificate%& must have a default which is used
 when &$tls_in_sni$& is empty.
-.wen
 
 The Exim developers are proceeding cautiously and so far no other TLS options
 are re-expanded.
@@ -27897,7 +27891,6 @@ received, before the final response to the DATA command is sent. This is
 the ACL specified by &%acl_smtp_data%&, which is the second ACL that is
 associated with the DATA command.
 
-.new
 .cindex CHUNKING "BDAT command"
 .cindex BDAT "SMTP command"
 .cindex "RFC 3030" CHUNKING
@@ -27906,7 +27899,6 @@ the &%acl_smtp_predata%& ACL is not run.
 . XXX why not?  It should be possible, for the first BDAT.
 The &%acl_smtp_data%& is run after the last BDAT command and all of
 the data specified is received.
-.wen
 
 For both of these ACLs, it is not possible to reject individual recipients. An
 error response rejects the entire message. Unfortunately, it is known that some
@@ -28118,6 +28110,11 @@ run. A &"discard"& return from the DATA or the non-SMTP ACL discards all the
 remaining recipients. The &"discard"& return is not permitted for the
 &%acl_smtp_predata%& ACL.
 
+.new
+If the ACL for VRFY returns &"accept"&, a recipient verify (without callout)
+is done on the address and the result determines the SMTP response.
+.wen
+
 
 .cindex "&[local_scan()]& function" "when all recipients discarded"
 The &[local_scan()]& function is always run, even if there are no remaining
@@ -28804,7 +28801,6 @@ all the conditions are true, wherever it appears in an ACL command, whereas
 effect.
 
 
-.new
 .vitem &*queue*&&~=&~<&'text'&>
 This modifier specifies the use of a named queue for spool files
 for the message.
@@ -28814,7 +28810,6 @@ This could be used, for example, for known high-volume burst sources
 of traffic, or for quarantine of messages.
 Separate queue-runner processes will be needed for named queues.
 If the text after expansion is empty, the default queue is used.
-.wen
 
 
 .vitem &*remove_header*&&~=&~<&'text'&>
@@ -28939,7 +28934,11 @@ message body.
 Cutthrough delivery is not supported via transport-filters or when DKIM signing
 of outgoing messages is done, because it sends data to the ultimate destination
 before the entire message has been received from the source.
-It is not supported for messages received with the SMTP PRDR option in use.
+It is not supported for messages received with the SMTP PRDR
+.new
+or CHUNKING
+.wen
+options in use.
 
 Should the ultimate destination system positively accept or reject the mail,
 a corresponding indication is given to the source system and nothing is queued.
@@ -28947,15 +28946,13 @@ If the item is successfully delivered in cutthrough mode
 the delivery log lines are tagged with ">>" rather than "=>" and appear
 before the acceptance "<=" line.
 
-.new
 If there is a temporary error the item is queued for later delivery in the
 usual fashion.
 This behaviour can be adjusted by appending the option &*defer=*&<&'value'&>
 to the control; the default value is &"spool"& and the alternate value
 &"pass"& copies an SMTP defer response from the target back to the initiator
 and does not queue the message.
-Note that this is independent of any receipient verify conditions in the ACL.
-.wen
+Note that this is independent of any recipient verify conditions in the ACL.
 
 Delivery in this mode avoids the generation of a bounce mail to a
 (possibly faked)
@@ -28971,9 +28968,7 @@ with &`-d`&, with the output going to a new logfile, by default called
 may access any variables already defined.  The logging may be adjusted with
 the &'opts'& option, which takes the same values as the &`-d`& command-line
 option.
-.new
 Logging may be stopped, and the file removed, with the &'kill'& option.
-.wen
 Some examples (which depend on variables that don't exist in all
 contexts):
 .code
@@ -29181,7 +29176,7 @@ that are being submitted at the same time using &%-bs%& or &%-bS%&.
 .vitem &*control&~=&~utf8_downconvert*&
 This control enables conversion of UTF-8 in message addresses
 to a-label form.
-For details see &<<SECTi18nMTA>>&.
+For details see section &<<SECTi18nMTA>>&.
 .endlist vlist
 
 
@@ -29794,6 +29789,15 @@ to avoid doing it more than once per message.
 .cindex "&%verify%& ACL condition"
 This is a variation of the previous option, in which a modified address is
 verified as a sender.
+
+.new
+Note that '/' is legal in local-parts; if the address may have such
+(eg. is generated from the received message)
+they must be protected from the options parsing by doubling:
+.code
+verify = sender=${sg{${address:$h_sender:}}{/}{//}}
+.endd
+.wen
 .endlist
 
 
@@ -29853,7 +29857,7 @@ deny  dnslists = blackholes.mail-abuse.org
 warn  message  = X-Warn: sending host is on dialups list
       dnslists = dialups.mail-abuse.org
 .endd
-.cindex cacheing "of dns lookup"
+.cindex caching "of dns lookup"
 .cindex DNS TTL
 DNS list lookups are cached by Exim for the duration of the SMTP session
 (but limited by the DNS return TTL value),
@@ -29966,7 +29970,7 @@ multiple DNS records. The inner dnsdb lookup produces a list of MX hosts
 and the outer dnsdb lookup finds the IP addresses for these hosts. The result
 of expanding the condition might be something like this:
 .code
-dnslists = sbl.spahmaus.org/<|192.168.2.3|192.168.5.6|...
+dnslists = sbl.spamhaus.org/<|192.168.2.3|192.168.5.6|...
 .endd
 Thus, this example checks whether or not the IP addresses of the sender
 domain's mail servers are on the Spamhaus black list.
@@ -31836,11 +31840,9 @@ spam bar is 50 characters.
 A multiline text table, containing the full SpamAssassin report for the
 message. Useful for inclusion in headers or reject messages.
 This variable is only usable in a DATA-time ACL.
-.new
 Beware that SpamAssassin may return non-ASCII characters, especially
 when running in country-specific locales, which are not legal
 unencoded in headers.
-.wen
 
 .vitem &$spam_action$&
 For SpamAssassin either 'reject' or 'no action' depending on the
@@ -36061,7 +36063,7 @@ The latter can be disabled by turning off the &%outgoing_interface%& option.
 &%proxy%&: The internal (closest to the system running Exim) IP address
 of the proxy, tagged by PRX=, on the &"<="& line for a message accepted
 on a proxied connection
-or the &"=>"& line for a message delivered on a proxied connection..
+or the &"=>"& line for a message delivered on a proxied connection.
 See &<<SECTproxyInbound>>& for more information.
 .next
 .cindex "log" "incoming remote port"
@@ -36092,7 +36094,7 @@ off the &%outgoing_interface%& option.
 .next
 .cindex "log" "outgoing remote port"
 .cindex "port" "logging outgoint remote"
-.cindex "TCP/IP" "logging ougtoing remote port"
+.cindex "TCP/IP" "logging outgoing remote port"
 &%outgoing_port%&: The remote port number is added to delivery log lines (those
 containing => tags) following the IP address.
 The local port is also added if &%incoming_interface%& and
@@ -37921,9 +37923,8 @@ lock will be lost at the instant of rename.
 .next
 .vindex "&$body_linecount$&"
 If you change the number of lines in the file, the value of
-&$body_linecount$&, which is stored in the -H file, will be incorrect. At
-present, this value is not used by Exim, but there is no guarantee that this
-will always be the case.
+&$body_linecount$&, which is stored in the -H file, will be incorrect and can
+cause incomplete transmission of messages or undeliverable messages.
 .next
 If the message is in MIME format, you must take care not to break it.
 .next
@@ -38267,6 +38268,7 @@ These options take (expandable) strings as arguments.
 MANDATORY:
 The domain you want to sign with. The result of this expanded
 option is put into the &%$dkim_domain%& expansion variable.
+If it is empty after expansion, DKIM signing is not done.
 
 .option dkim_selector smtp string&!! unset
 MANDATORY:
@@ -38431,11 +38433,9 @@ The header canonicalization method. One of 'relaxed' or 'simple'.
 .vitem &%$dkim_copiedheaders%&
 A transcript of headers and their values which are included in the signature
 (copied from the 'z=' tag of the signature).
-.new
 Note that RFC6376 requires that verification fail if the From: header is
 not included in the signature.  Exim does not enforce this; sites wishing
 strict enforcement should code the check explicitly.
-.wen
 
 .vitem &%$dkim_bodylength%&
 The number of signed body bytes. If zero ("0"), the body is unsigned. If no
@@ -38493,10 +38493,8 @@ warn log_message = GMail sender without gmail.com DKIM signature
      dkim_status = none
 .endd
 
-.new
 Note that the above does not check for a total lack of DKIM signing;
 for that check for empty &$h_DKIM-Signature:$& in the data ACL.
-.wen
 
 .vitem &%dkim_status%&
 ACL condition that checks a colon-separated list of possible DKIM verification
@@ -38539,9 +38537,9 @@ To include this support, include &"SUPPORT_PROXY=yes"&
 in Local/Makefile.
 
 It was built on specifications from:
-http://haproxy.1wt.eu/download/1.5/doc/proxy-protocol.txt
+(&url(http://haproxy.1wt.eu/download/1.5/doc/proxy-protocol.txt)).
 That URL was revised in May 2014 to version 2 spec:
-http://git.1wt.eu/web?p=haproxy.git;a=commitdiff;h=afb768340c9d7e50d8e
+(&url(http://git.1wt.eu/web?p=haproxy.git;a=commitdiff;h=afb768340c9d7e50d8e)).
 
 The purpose of this facility is so that an application load balancer,
 such as HAProxy, can sit in front of several Exim servers
@@ -38555,8 +38553,14 @@ recorded in an ACL (example is below).
 Use of a proxy is enabled by setting the &%hosts_proxy%&
 main configuration option to a hostlist; connections from these
 hosts will use Proxy Protocol.
+Exim supports both version 1 and version 2 of the Proxy Protocol and
+automatically determines which version is in use.
+
+The Proxy Protocol header is the first data received on a TCP connection
+and is inserted before any TLS-on-connect handshake from the client; Exim
+negotiates TLS between Exim-as-server and the remote client, not between
+Exim and the proxy server.
 
-.new
 The following expansion variables are usable
 (&"internal"& and &"external"& here refer to the interfaces
 of the proxy):
@@ -38569,7 +38573,6 @@ of the proxy):
 .endd
 If &$proxy_session$& is set but &$proxy_external_address$& is empty
 there was a protocol error.
-.wen
 
 Since the real connections are all coming from the proxy, and the
 per host connection tracking is done before Proxy Protocol is
@@ -38677,6 +38680,12 @@ Exim has support for Internationalised mail names.
 To include this it must be built with SUPPORT_I18N and the libidn library.
 Standards supported are RFCs 2060, 5890, 6530 and 6533.
 
+.new
+If Exim is built with SUPPORT_I18N_2008 (in addition to SUPPORT_I18N, not
+instead of it) then IDNA2008 is supported; this adds an extra library
+requirement, upon libidn2.
+.wen
+
 .section "MTA operations" SECTi18nMTA
 .cindex SMTPUTF8 "ESMTP option"
 The main configuration option &%smtputf8_advertise_hosts%& specifies
@@ -38790,7 +38799,7 @@ must be representable in UTF-16.
 .cindex events
 
 The events mechanism in Exim can be used to intercept processing at a number
-of points.  It was originally invented to giave a way to do customised logging
+of points.  It was originally invented to give a way to do customised logging
 actions (for example, to a database) but can also be used to modify some
 processing actions.
 
@@ -38849,7 +38858,7 @@ can be used to affect that action (more on this below).
 An additional variable, &$event_data$&, is filled with information varying
 with the event type:
 .display
-&`msg:delivery         `& smtp confirmation mssage
+&`msg:delivery         `& smtp confirmation message
 &`msg:rcpt:host:defer  `& error string
 &`msg:rcpt:defer       `& error string
 &`msg:host:defer       `& error string
@@ -38860,7 +38869,7 @@ with the event type:
 The :defer events populate one extra variable: &$event_defer_errno$&.
 
 For complex operations an ACL expansion can be used in &%event_action%&
-however due to the multiple contextx that Exim operates in during
+however due to the multiple contexts that Exim operates in during
 the course of its processing:
 .ilist
 variables set in transport events will not be visible outside that