Add another wish.

[exim.git] / doc / doc-src / spec.src

diff --git a/doc/doc-src/spec.src b/doc/doc-src/spec.src
index 69ebca07deb03565ece8599542dcccee8ce5f770..dd768568996b52447cad1d43cff8ec8d49bfbcd9 100644 (file)
--- a/doc/doc-src/spec.src
+++ b/doc/doc-src/spec.src
@@ -1,4 +1,4 @@
-. $Cambridge: exim/doc/doc-src/spec.src,v 1.6 2005/01/27 15:00:38 ph10 Exp $
+. $Cambridge: exim/doc/doc-src/spec.src,v 1.8 2005/02/17 11:58:25 ph10 Exp $

 .
 .set version "4.50"
 .set previousversion "4.40"
 .
 .set version "4.50"
 .set previousversion "4.40"


@@ -477,12 +477,15 @@ tips, and know-how for the benefit of others.
 
 .section Mailing lists
 .index mailing lists||for Exim users
 
 .section Mailing lists
 .index mailing lists||for Exim users

-The following are the two main Exim mailing lists:
+.em
+The following are the three main Exim mailing lists:

 .display rm
 .tabs 28
 $it{exim-users@@exim.org}          $t general discussion list
 .display rm
 .tabs 28
 $it{exim-users@@exim.org}          $t general discussion list

+$it{exim-dev@@exim.org}            $t discussion of bugs, enhancements, etc.

 $it{exim-announce@@exim.org}       $t moderated, low volume announcements list
 .endd
 $it{exim-announce@@exim.org}       $t moderated, low volume announcements list
 .endd

+.nem

 You can subscribe to these lists, change your existing subscriptions, and view
 or search the archives via the
 .if ~~html
 You can subscribe to these lists, change your existing subscriptions, and view
 or search the archives via the
 .if ~~html


@@ -3276,9 +3279,11 @@ name of the run time configuration file that is in use.
 .em
 As part of its operation, \-bV-\ causes Exim to read and syntax check its 
 configuration file. However, this is a static check only. It cannot check
 .em
 As part of its operation, \-bV-\ causes Exim to read and syntax check its 
 configuration file. However, this is a static check only. It cannot check

-values that to be expanded. You cannot rely on \-bV-\ alone to discover (for 
-example) all the typos in the configuration; some realistic testing is needed.
-The \-bh-\ and \-N-\ options provide more dynamic testing facilities.
+values that are to be expanded. For example, although a misspelt ACL verb is
+detected, an error in the verb's arguments is not. You cannot rely on \-bV-\
+alone to discover (for example) all the typos in the configuration; some
+realistic testing is needed. The \-bh-\ and \-N-\ options provide more dynamic
+testing facilities.

 .nem
 
 
 .nem
 
 


@@ -5957,7 +5962,7 @@ whereas for \%nwildlsearch%\, no expansion takes place.
 Like \%lsearch%\, the testing is done case-insensitively. The following forms
 of wildcard are recognized:
 .numberpars "$*$"
 Like \%lsearch%\, the testing is done case-insensitively. The following forms
 of wildcard are recognized:
 .numberpars "$*$"

-The string may begin with an asterisk to mean `begins with'. For example:
+The string may begin with an asterisk to mean `ends with'. For example:

 .display asis
 *.a.b.c       data for anything.a.b.c
 *fish         data for anythingfish
 .display asis
 *.a.b.c       data for anything.a.b.c
 *fish         data for anythingfish


@@ -9633,9 +9638,14 @@ compilations of the same version of the program.
 
 .em
 .tempindent 0
 
 .em
 .tempindent 0

-\$demime@_$\\*xxx*\: Two variables whose names start with \$demime$\ are
-available when Exim is compiled with the content-scanning extension and the
-obsolete \demime\ condition. For details, see section ~~SECTdemimecond.
+\$demime@_errorlevel$\: This variable is available when Exim is compiled with
+the content-scanning extension and the obsolete \demime\ condition. For
+details, see section ~~SECTdemimecond.
+
+.tempindent 0
+\$demime@_reason$\: This variable is available when Exim is compiled with the
+content-scanning extension and the obsolete \demime\ condition. For details,
+see section ~~SECTdemimecond.

 .nem
 
 .index black list (DNS)
 .nem
 
 .index black list (DNS)


@@ -10037,10 +10047,9 @@ if no size was given. The value may not, of course, be truthful.
 
 .em
 .tempindent 0
 
 .em
 .tempindent 0

-\$mime@_$\\*xxx*\:
-A number of variables whose names start with \$mime$\ are available when Exim
-is compiled with the content-scanning extension. For details, see section
-~~SECTscanmimepart.
+\$mime@_$\\*xxx*\: A number of variables whose names start with \$mime$\ are
+available when Exim is compiled with the content-scanning extension. For
+details, see section ~~SECTscanmimepart.

 .nem
 
 .tempindent 0
 .nem
 
 .tempindent 0


@@ -10171,10 +10180,12 @@ authenticated. Thus, for example, if the protocol is set to `esmtpsa', the
 message was received over an encrypted SMTP connection and the client was
 successfully authenticated.
 
 message was received over an encrypted SMTP connection and the client was
 successfully authenticated.
 

-Exim also uses the protocol name `smtps' for the rare situation where the 
-client initially used \\EHLO\\, set up an encrypted connection using
-\\STARTTLS\\, and then used \\HELO\\ afterwards to initiate the encrypted 
-session.
+Exim uses the protocol name `smtps' for the case when encryption is
+automatically set up on connection without the use of \\STARTTLS\\ (see
+\tls@_on@_connect@_ports\), and the client uses \\HELO\\ to initiate the
+encrypted SMTP session. The name `smtps' is also used for the rare situation
+where the client initially uses \\EHLO\\, sets up an encrypted connection using
+\\STARTTLS\\, and then uses \\HELO\\ afterwards.

 
 The \-oMr-\ option provides a way of specifying a custom protocol name for 
 messages that are injected locally by trusted callers. This is commonly used to 
 
 The \-oMr-\ option provides a way of specifying a custom protocol name for 
 messages that are injected locally by trusted callers. This is commonly used to 


@@ -10849,15 +10860,17 @@ value of \daemon@_smtp@_ports\ is no longer relevant in this example.)
 
 
 .em
 
 
 .em

-.section Support for the obsolete SSMTP protocol
+.section Support for the obsolete SSMTP (or SMTPS) protocol

 .rset SECTsupobssmt "~~chapter.~~section"
 .index ssmtp protocol
 .rset SECTsupobssmt "~~chapter.~~section"
 .index ssmtp protocol

+.index smtps protocol

 .index SMTP||ssmtp protocol
 .index SMTP||ssmtp protocol

-Exim supports the obsolete SSMTP protocol that was used before the \\STARTTLS\\ 
-command was standardized for SMTP. Some legacy clients still use this protocol.
-If the \tls@_on@_connect@_ports\ option is set to a list of port numbers, 
-connections to those ports must use SSMTP. The most common use of this option
-is expected to be
+.index SMTP||smtps protocol
+Exim supports the obsolete SSMTP protocol (also known as SMTPS) that was used
+before the \\STARTTLS\\ command was standardized for SMTP. Some legacy clients
+still use this protocol. If the \tls@_on@_connect@_ports\ option is set to a
+list of port numbers, connections to those ports must use SSMTP. The most
+common use of this option is expected to be

 .display asis
 tls_on_connect_ports = 465
 .endd
 .display asis
 tls_on_connect_ports = 465
 .endd


@@ -11216,7 +11229,7 @@ listed in more than one group.
 \tls@_dhparam\                          $t$rm{DH parameters for server}
 .newline
 .em
 \tls@_dhparam\                          $t$rm{DH parameters for server}
 .newline
 .em

-\tls@_on@_connect@_ports\               $t$rm{specify SSMTP ports}
+\tls@_on@_connect@_ports\               $t$rm{specify SSMTP (SMTPS) ports}

 .nem
 .newline
 \tls@_privatekey\                       $t$rm{location of server private key}
 .nem
 .newline
 \tls@_privatekey\                       $t$rm{location of server private key}


@@ -11407,17 +11420,17 @@ Consequently, this option is turned off by default.
 This option defines the ACL that is run when a non-SMTP message is on the point
 of being accepted. See chapter ~~CHAPACL for further details.
 
 This option defines the ACL that is run when a non-SMTP message is on the point
 of being accepted. See chapter ~~CHAPACL for further details.
 

-.index ~~ACL||on SMTP connection
-.conf acl@_smtp@_connect string$**$ unset
-This option defines the ACL that is run when an SMTP connection is received.
-See chapter ~~CHAPACL for further details.
-

 .index ~~ACL||setting up for SMTP commands
 .index \\AUTH\\||ACL for
 .conf acl@_smtp@_auth string$**$ unset
 This option defines the ACL that is run when an SMTP \\AUTH\\ command is
 received. See chapter ~~CHAPACL for further details.
 
 .index ~~ACL||setting up for SMTP commands
 .index \\AUTH\\||ACL for
 .conf acl@_smtp@_auth string$**$ unset
 This option defines the ACL that is run when an SMTP \\AUTH\\ command is
 received. See chapter ~~CHAPACL for further details.
 

+.index ~~ACL||on SMTP connection
+.conf acl@_smtp@_connect string$**$ unset
+This option defines the ACL that is run when an SMTP connection is received.
+See chapter ~~CHAPACL for further details.
+

 .index \\DATA\\, ACL for
 .conf acl@_smtp@_data string$**$ unset
 This option defines the ACL that is run after an SMTP \\DATA\\ command has been
 .index \\DATA\\, ACL for
 .conf acl@_smtp@_data string$**$ unset
 This option defines the ACL that is run after an SMTP \\DATA\\ command has been


@@ -12811,13 +12824,18 @@ override; they are accepted, but ignored.
 .index queue runner||processing messages in order
 If this option is set, queue runs happen in order of message arrival instead of
 in an arbitrary order. For this to happen, a complete list of the entire queue
 .index queue runner||processing messages in order
 If this option is set, queue runs happen in order of message arrival instead of
 in an arbitrary order. For this to happen, a complete list of the entire queue

-must be set up before the deliveries start. When the queue is all in a single
-directory (the default), this happens anyway, but if \split@_spool@_directory\
-is set it does not -- for delivery in random order, the sub-directories are
-processed one at a time (in random order), to avoid setting up one huge list.
-Thus, setting \queue@_run@_in@_order\ with \split@_spool@_directory\ may
-degrade performance when the queue is large. In most situations,
-\queue@_run@_in@_order\ should not be set.
+must be set up before the deliveries start. When the queue is all held in a
+single directory (the default),
+.em
+a single list is created for both the ordered and the non-ordered cases.
+However, if \split@_spool@_directory\ is set, a single list is not created when
+\queue@_run@_in@_order\ is false. In this case, the sub-directories are
+processed one at a time (in a random order), and this avoids setting up one
+huge list for the whole queue. Thus, setting \queue@_run@_in@_order\ with
+\split@_spool@_directory\ may degrade performance when the queue is large,
+because of the extra work in setting up the single, large list. In most
+situations, \queue@_run@_in@_order\ should not be set.
+.nem

 
 .conf queue@_run@_max integer 5
 .index queue runner||maximum number of
 
 .conf queue@_run@_max integer 5
 .index queue runner||maximum number of


@@ -13162,6 +13180,7 @@ expanded and used instead of the value of \$primary@_hostname$\ in SMTP
 responses. For example, it is used as domain name in the response to an
 incoming \\HELO\\ or \\EHLO\\ command. 
 .em
 responses. For example, it is used as domain name in the response to an
 incoming \\HELO\\ or \\EHLO\\ command. 
 .em

+It is also used in \\HELO\\ commands for callout verification.

 The active hostname is placed in the \$smtp__active__hostname$\ variable, which 
 is saved with any messages that are received. It is therefore available for use 
 in routers and transports when the message is later delivered.
 The active hostname is placed in the \$smtp__active__hostname$\ variable, which 
 is saved with any messages that are received. It is therefore available for use 
 in routers and transports when the message is later delivered.


@@ -13639,10 +13658,10 @@ ignored. See section ~~SECTopenvsgnu for further details.
 
 .em
 .conf tls@_on@_connect@_ports "string list" unset
 
 .em
 .conf tls@_on@_connect@_ports "string list" unset

-This option specifies a list of incoming SSMTP ports that should operate the 
-obsolete SSMTP protocol, where a TLS session is immediately set up without 
-waiting for the client to issue a \\STARTTLS\\ command. For further details,
-see section ~~SECTsupobssmt.
+This option specifies a list of incoming SSMTP (aka SMTPS) ports that should
+operate the obsolete SSMTP (SMTPS) protocol, where a TLS session is immediately
+set up without waiting for the client to issue a \\STARTTLS\\ command. For
+further details, see section ~~SECTsupobssmt.

 .nem
 
 .conf tls@_privatekey string$**$ unset
 .nem
 
 .conf tls@_privatekey string$**$ unset


@@ -16113,12 +16132,20 @@ text associated with the failure. For example, an alias file might contain:
 X.Employee:  :fail: Gone away, no forwarding address
 .endd
 In the case of an address that is being verified from an ACL or as the subject
 X.Employee:  :fail: Gone away, no forwarding address
 .endd
 In the case of an address that is being verified from an ACL or as the subject

-of a \\VRFY\\ command, the text is included in the SMTP error response by
-default. In an ACL, an explicitly provided message overrides the default, but
-the default message is available in the variable \$acl@_verify@_message$\ and
-can therefore be included in a custom message if this is desired. Exim sends a
-451 SMTP code for a :::defer::, and 550 for :::fail::. In non-SMTP cases the
-text is included in the error message that Exim generates.
+of a 
+.index \\VRFY\\||error text, display of
+\\VRFY\\ command, the text is included in the SMTP error response by
+default. 
+.em
+.index \\EXPN\\||error text, display of
+The text is not included in the response to an \\EXPN\\ command.
+.nem
+
+In an ACL, an explicitly provided message overrides the default, but the
+default message is available in the variable \$acl@_verify@_message$\ and can
+therefore be included in a custom message if this is desired. Exim sends a 451
+SMTP code for a :::defer::, and 550 for :::fail::. In non-SMTP cases the text
+is included in the error message that Exim generates.

 
 
 
 
 
 


@@ -18798,10 +18825,18 @@ If this option is set, and the command returns any output, and also ends with a
 return code that is neither zero nor one of the return codes listed in
 \temp@_errors\ (that is, the delivery failed), the first line of output is
 written to the main log.
 return code that is neither zero nor one of the return codes listed in
 \temp@_errors\ (that is, the delivery failed), the first line of output is
 written to the main log.

+.em
+This option and \log@_output\ are mutually exclusive. Only one of them may be 
+set.
+.nem

 
 .conf log@_output boolean false
 If this option is set and the command returns any output, the first line of
 output is written to the main log, whatever the return code.
 
 .conf log@_output boolean false
 If this option is set and the command returns any output, the first line of
 output is written to the main log, whatever the return code.

+.em
+This option and \log@_fail@_output\ are mutually exclusive. Only one of them
+may be set.
+.nem

 
 .conf max@_output integer 20K
 This specifies the maximum amount of output that the command may produce on its
 
 .conf max@_output integer 20K
 This specifies the maximum amount of output that the command may produce on its


@@ -18866,6 +18901,10 @@ return code other than zero or one of the codes listed in \temp@_errors\ (that
 is, the delivery failed), the output is returned in the bounce message.
 However, if the message has a null sender (that is, it is itself a bounce
 message), output from the command is discarded.
 is, the delivery failed), the output is returned in the bounce message.
 However, if the message has a null sender (that is, it is itself a bounce
 message), output from the command is discarded.

+.em
+This option and \return@_output\ are mutually exclusive. Only one of them may
+be set.
+.nem

 
 .conf return@_output boolean false
 If this option is true, and the command produced any output, the delivery is
 
 .conf return@_output boolean false
 If this option is true, and the command produced any output, the delivery is


@@ -18874,6 +18913,10 @@ is returned in the bounce message. Otherwise, the output is just discarded.
 However, if the message has a null sender (that is, it is a bounce message),
 output from the command is always discarded, whatever the setting of this
 option.
 However, if the message has a null sender (that is, it is a bounce message),
 output from the command is always discarded, whatever the setting of this
 option.

+.em
+This option and \return@_fail@_output\ are mutually exclusive. Only one of them
+may be set.
+.nem

 
 .conf temp@_errors "string list" "see below"
 .index \%pipe%\ transport||temporary failure
 
 .conf temp@_errors "string list" "see below"
 .index \%pipe%\ transport||temporary failure


@@ -21210,6 +21253,8 @@ The \%cyrus@_sasl%\ authenticator provides server support for the Cyrus SASL
 library implementation of the RFC 2222 (`Simple Authentication and Security
 Layer'). This library supports a number of authentication mechanisms, including
 PLAIN and LOGIN, but also several others that Exim does not support directly.
 library implementation of the RFC 2222 (`Simple Authentication and Security
 Layer'). This library supports a number of authentication mechanisms, including
 PLAIN and LOGIN, but also several others that Exim does not support directly.

+In particular, there is support for Kerberos authentication.
+

 The \%cyrus@_sasl%\ authenticator provides a gatewaying mechanism directly to
 the Cyrus interface, so if your Cyrus library can do, for example, CRAM-MD5,
 then so can the \%cyrus@_sasl%\ authenticator. By default it uses the public
 The \%cyrus@_sasl%\ authenticator provides a gatewaying mechanism directly to
 the Cyrus interface, so if your Cyrus library can do, for example, CRAM-MD5,
 then so can the \%cyrus@_sasl%\ authenticator. By default it uses the public


@@ -21405,14 +21450,16 @@ in order to get TLS to work.
 
 
 .em
 
 
 .em

-.section Support for the legacy `ssmtp' protocol
+.section Support for the legacy `ssmtp' (aka `smtps') protocol

 .index ssmtp protocol
 .index ssmtp protocol

+.index smtps protocol

 .index SMTP||ssmtp protocol
 .index SMTP||ssmtp protocol

+.index SMTP||smtps protocol

 Early implementations of encrypted SMTP used a different TCP port from normal
 SMTP, and expected an encryption negotiation to start immediately, instead of 
 waiting for a \\STARTTLS\\ command from the client using the standard SMTP 
 Early implementations of encrypted SMTP used a different TCP port from normal
 SMTP, and expected an encryption negotiation to start immediately, instead of 
 waiting for a \\STARTTLS\\ command from the client using the standard SMTP 

-port. The protocol was called `ssmtp' and port 465 was allocated for this
-purpose. 
+port. The protocol was called `ssmtp' or `smtps', and port 465 was allocated
+for this purpose.

 
 This approach was abandoned when encrypted SMTP was standardised, but there are
 still some legacy clients that use it. Exim supports these clients by means of
 
 This approach was abandoned when encrypted SMTP was standardised, but there are
 still some legacy clients that use it. Exim supports these clients by means of


@@ -23215,7 +23262,7 @@ Details of verification are given later, starting at section
 ~~SECTaddressverification. Exim caches the result of sender verification, to
 avoid doing it more than once per message.
 
 ~~SECTaddressverification. Exim caches the result of sender verification, to
 avoid doing it more than once per message.
 

-.item "verify = sender=address/<<options>>"
+.item "verify = sender=<<address>>/<<options>>"

 .index \verify\, ACL condition
 This is a variation of the previous option, in which a modified address is
 verified as a sender.
 .index \verify\, ACL condition
 This is a variation of the previous option, in which a modified address is
 verified as a sender.


@@ -24209,7 +24256,7 @@ contributing the code for this scanner.
 .index virus scanners||command line interface
 \cmdline\: This is the keyword for the generic command line scanner interface.
 It can be used to attach virus scanners that are invoked from the shell. This
 .index virus scanners||command line interface
 \cmdline\: This is the keyword for the generic command line scanner interface.
 It can be used to attach virus scanners that are invoked from the shell. This

-scanner type takes 3 mantadory options:
+scanner type takes 3 mandatory options:

 .numberpars
 The full path and name of the scanner binary, with all command line options,
 and a placeholder (%s) for the directory to scan.
 .numberpars
 The full path and name of the scanner binary, with all command line options,
 and a placeholder (%s) for the directory to scan.