Split out cutthrough connection-cache / subsequent-rcpt handling, from do_callout()

[exim.git] / doc / doc-docbook / spec.xfpt

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index a4aaa5429a1a283551f58ddf6b40cfa9390dc25b..7d8b908f81a18c638d71408d9c85179518c65082 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -4480,7 +4480,7 @@ will specify a queue to operate on.
 For example:
 .code
 exim -bp -qGquarantine
 For example:
 .code
 exim -bp -qGquarantine

-mailq -qGquarantime
+mailq -qGquarantine

 exim -qGoffpeak -Rf @special.domain.example
 .endd
 
 exim -qGoffpeak -Rf @special.domain.example
 .endd
 


@@ -7110,7 +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%&.
 
 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).
 .cindex TTL "of dns lookup"
 .cindex DNS TTL
 Dnsdb lookup results are cached within a single process (and its children).


@@ -9105,7 +9105,7 @@ If the ACL returns defer the result is a forced-fail.  Otherwise the expansion f
 
 .vitem "&*${certextract{*&<&'field'&>&*}{*&<&'certificate'&>&*}&&&
        {*&<&'string2'&>&*}{*&<&'string3'&>&*}}*&"
 
 .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.
 .cindex "&%certextract%&" "certificate fields"
 .cindex "certificate" "extracting fields"
 The <&'certificate'&> must be a variable of type certificate.


@@ -12210,7 +12210,7 @@ normally the gid of the Exim user.
 .cindex "uid (user id)" "of originating user"
 .cindex "sender" "uid"
 .vindex "&$caller_uid$&"
 .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
 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


@@ -12828,7 +12828,7 @@ If TLS has not been negotiated, the value will be 0.
 
 .vitem &$tls_in_ourcert$&
 .vindex "&$tls_in_ourcert$&"
 
 .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
 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


@@ -13098,7 +13098,7 @@ initial startup, even if &%perl_at_start%& is set.
 .oindex "&%perl_taintmode%&"
 .cindex "Perl" "taintmode"
 To provide more security executing Perl code via the embedded Perl
 .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.
 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.


@@ -14406,7 +14406,7 @@ it obviously cannot send an error message of any kind.
 
 There is a slight performance penalty for these checks.
 Versions of Exim preceding 4.88 had these disabled by default;
 
 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.
 
 .option chunking_advertise_hosts main "host list&!!" *
 may wish to deliberately disable them.
 
 .option chunking_advertise_hosts main "host list&!!" *


@@ -16714,7 +16714,7 @@ 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,
 .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.
 
 response to EHLO only to those client hosts that match this option. See
 chapter &<<CHAPi18n>>& for details of Exim's support for internationalisation.
 


@@ -21007,7 +21007,7 @@ 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
 
 .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
 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


@@ -23971,7 +23971,7 @@ unauthenticated. See also &%hosts_require_auth%&, and chapter
 .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.
 .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.
+BDAT will not be used in conjunction with a transport filter.

 
 .option hosts_try_fastopen smtp "host list!!" unset
 .cindex "fast open, TCP" "enabling, in client"
 
 .option hosts_try_fastopen smtp "host list!!" unset
 .cindex "fast open, TCP" "enabling, in client"


@@ -25865,6 +25865,19 @@ turned into a permanent error if you wish. In the second case, Exim tries to
 deliver the message unauthenticated.
 .endlist
 
 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
 .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


@@ -27536,7 +27549,7 @@ 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.
 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.

-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.
 
 an expansion for &%tls_certificate%& must have a default which is used
 when &$tls_in_sni$& is empty.
 


@@ -28080,6 +28093,11 @@ 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.
 
 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
 
 .cindex "&[local_scan()]& function" "when all recipients discarded"
 The &[local_scan()]& function is always run, even if there are no remaining


@@ -28913,7 +28931,7 @@ 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.
 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.
+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)
 
 Delivery in this mode avoids the generation of a bounce mail to a
 (possibly faked)


@@ -29809,7 +29827,7 @@ deny  dnslists = blackholes.mail-abuse.org
 warn  message  = X-Warn: sending host is on dialups list
       dnslists = dialups.mail-abuse.org
 .endd
 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),
 .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),


@@ -29922,7 +29940,7 @@ 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
 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.
 .endd
 Thus, this example checks whether or not the IP addresses of the sender
 domain's mail servers are on the Spamhaus black list.


@@ -36046,7 +36064,7 @@ off the &%outgoing_interface%& option.
 .next
 .cindex "log" "outgoing remote port"
 .cindex "port" "logging outgoint remote"
 .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
 &%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


@@ -38798,7 +38816,7 @@ 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
 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
 &`msg:rcpt:host:defer  `& error string
 &`msg:rcpt:defer       `& error string
 &`msg:host:defer       `& error string