defined. AAAA records (analogous to A records for IPv4) are in use, and are
currently seen as the mainstream. Another record type called A6 was proposed
as better than AAAA because it had more flexibility. However, it was felt to be
-over-complex, and its status was reduced to &"experimental"&. Exim used to
+over-complex, and its status was reduced to &"experimental"&.
+.new
+Exim used to
have a compile option for including A6 record support but this has now been
withdrawn.
+.wen
This option is interpreted by Sendmail to cause debug information to be sent
to the named file. It is ignored by Exim.
+.new
.vitem &%-z%&&~<&'log-line'&>
.oindex "&%-z%&"
This option writes its argument to Exim's logfile.
Use is restricted to administrators; the intent is for operational notes.
Quotes should be used to maintain a multi-word item as a single argument,
under most shells.
+.wen
.endlist
.ecindex IIDclo1
colon in the example above is necessary. If it were not there, the list would
be interpreted as the two items 127.0.0.1:: and 1.
-.section "Changing list separators" "SECID53"
+.section "Changing list separators" "SECTlistsepchange"
.cindex "list separator" "changing"
.cindex "IPv6" "addresses in lists"
Doubling colons in IPv6 addresses is an unwelcome chore, so a mechanism was
show how you can specify hosts that are permitted to send unqualified sender
and recipient addresses, respectively.
+.new
The &%log_selector%& option is used to increase the detail of logging
over the default:
.code
log_selector = +smtp_protocol_error +smtp_syntax_error \
+tls_certificate_verified
.endd
+.wen
The &%percent_hack_domains%& option is also commented out:
.code
&`fail`& keyword causes a &'forced expansion failure'& &-- see section
&<<SECTforexpfai>>& for an explanation of what this means.
+.new
The supported DNS record types are A, CNAME, MX, NS, PTR, SOA, SPF, SRV, TLSA
and TXT, and, when Exim is compiled with IPv6 support, AAAA.
If no type is given, TXT is assumed.
+.wen
For any record type, if multiple records are found, the data is returned as a
concatenation, with newline as the default separator. The order, of course,
It is permitted to specify a space as the separator character. Further
white space is ignored.
+.new
.cindex "SOA record" "in &(dnsdb)& lookup"
For an SOA lookup, while no result is obtained the lookup is redone with
successively more leading components dropped from the given domain.
.code
${lookup dnsdb{>:,; soa=a.b.example.com}}
.endd
+.wen
.section "Dnsdb lookup modifiers" "SECTdnsdb_mod"
.cindex "dnsdb modifiers"
.cindex "modifiers" "dnsdb"
.cindex "options" "dnsdb"
-Modifiers for &(dnsdb)& lookups are givien by optional keywords,
+Modifiers for &(dnsdb)& lookups are given by optional keywords,
each followed by a comma,
that may appear before the record type.
See also the &$lookup_dnssec_authenticated$& variable.
+.new
.cindex timeout "dns lookup"
.cindex "DNS" timeout
Timeout for the dnsdb lookup can be controlled by a retrans modifier.
The form is &"retrans_VAL"& where VAL is an Exim time specification
-(eg &"5s"&).
+(e.g. &"5s"&).
The default value is set by the main configuration option &%dns_retrans%&.
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%&.
+.wen
.section "Pseudo dnsdb record types" "SECID66"
different types of pattern for each case are described, but first we cover some
general facilities that apply to all four kinds of list.
+.new
+Note that other parts of Exim use a &'string list'& which does not
+support all the complexity available in
+domain, host, address and local part lists.
+.wen
+
.section "Expansion of lists" "SECID75"
.cindex "&`+ignore_defer`&"
A temporary DNS lookup failure normally causes a defer action (except when
&%dns_again_means_nonexist%& converts it into a permanent error). However,
-host lists can include &`+ignore_defer`& and &`+include_defer`&, analagous to
+host lists can include &`+ignore_defer`& and &`+include_defer`&, analogous to
&`+ignore_unknown`& and &`+include_unknown`&, as described in the previous
section. These options should be used with care, probably only in non-critical
host lists such as whitelists.
.cindex "&%certextract%&" "certificate fields"
.cindex "certificate" "extracting fields"
The <&'certificate'&> must be a variable of type certificate.
-The field name is expanded and used to retrive the relevant field from
+The field name is expanded and used to retrieve the relevant field from
the certificate. Supported fields are:
.display
&`version `&
RDN elements of a single type may be selected by
a modifier of the type label; if so the expansion
result is a list (newline-separated by default).
-The separator may be changed by another modifer of
+The separator may be changed by another modifier of
a right angle-bracket followed immediately by the new separator.
Recognised RDN type labels include "CN", "O", "OU" and "DC".
prefix each list element with a type string and an equals sign.
Elements of only one type may be selected by a modifier
which is one of "dns", "uri" or "mail";
-if so the elenment tags are omitted.
+if so the element tags are omitted.
If not otherwise noted field values are presented in human-readable form.
configuration, you must add &%-export-dynamic%& to EXTRALIBS.
+.new
.vitem "&*${env{*&<&'key'&>&*}{*&<&'string1'&>&*}{*&<&'string2'&>&*}}*&"
.cindex "expansion" "extracting value from environment"
.cindex "environment" "value from"
This forces an expansion failure (see section &<<SECTforexpfai>>&);
{<&'string1'&>} must be present for &"fail"& to be recognized.
-If {<&'string2'&>} is omitted an empty string is substituted on
+If {<&'string2'&>} is omitted an empty string is substituted on
search failure.
If {<&'string1'&>} is omitted the search result is substituted on
search success.
+.wen
.vitem "&*${extract{*&<&'key'&>&*}{*&<&'string1'&>&*}{*&<&'string2'&>&*}&&&
To clarify "list of addresses in RFC 2822 format" mentioned above, Exim follows
a strict interpretation of header line formatting. Exim parses the bare,
unquoted portion of an email address and if it finds a comma, treats it as an
-email address seperator. For the example header line:
+email address separator. For the example header line:
.code
From: =?iso-8859-2?Q?Last=2C_First?= <user@example.com>
.endd
.vitem &*${reverse_ip:*&<&'ipaddr'&>&*}*&
.cindex "expansion" "IP address"
This operator reverses an IP address; for IPv4 addresses, the result is in
-dotted-quad decimal form, while for IPv6 addreses the result is in
+dotted-quad decimal form, while for IPv6 addresses the result is in
dotted-nibble hexadecimal form. In both cases, this is the "natural" form
for DNS. For example,
.code
content-scanning extension and the obsolete &%demime%& condition. For details,
see section &<<SECTdemimecond>>&.
+.new
.vitem &$dkim_cur_signer$& &&&
&$dkim_verify_status$& &&&
&$dkim_verify_reason$& &&&
When a message has been received this variable contains
a colon-separated list of signer domains and identities for the message.
For details see chapter &<<CHAPdkim>>&.
+.wen
.vitem &$dnslist_domain$& &&&
&$dnslist_matched$& &&&
It will be empty if &(DNSSEC)& was not requested,
&"no"& if the result was not labelled as authenticated data
and &"yes"& if it was.
-Results that are labelled as authoritive answer that match
-the $%dns_trust_aa%$ configuration variable count also
+.new
+Results that are labelled as authoritative answer that match
+the &%dns_trust_aa%& configuration variable count also
as authenticated data.
+.wen
.vitem &$mailstore_basename$&
.vindex "&$mailstore_basename$&"
.vindex "&$sender_helo_dnssec$&"
This boolean variable is true if a successful HELO verification was
.cindex "DNS" "DNSSEC"
-done using DNS information the resolver library stated was authenticatied data.
+done using DNS information the resolver library stated was authenticated data.
.wen
.vitem &$sender_helo_name$&
.endd
Exim does not perform DNSSEC validation itself, instead leaving that to a
-validating resolver (eg, unbound, or bind with suitable configuration).
+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.
It is only useful as the argument of a
&%certextract%& expansion item, &%md5%&, &%sha1%& or &%sha256%& operator,
or a &%def%& condition.
+.new
If certificate verification fails it may refer to a failing chain element
which is not the leaf.
+.wen
.vitem &$tls_out_ourcert$&
.vindex "&$tls_out_ourcert$&"
outbound connection. It is only useful as the argument of a
&%certextract%& expansion item, &%md5%&, &%sha1%& or &%sha256%& operator,
or a &%def%& condition.
+.new
If certificate verification fails it may refer to a failing chain element
which is not the leaf.
+.wen
.vitem &$tls_in_certificate_verified$&
.vindex "&$tls_in_certificate_verified$&"
This variable is set to &"1"& if a TLS certificate was verified when the
message was received, and &"0"& otherwise.
-The deprecated &$tls_certificate_verfied$& variable refers to the inbound side
+The deprecated &$tls_certificate_verified$& variable refers to the inbound side
except when used in the context of an outbound SMTP delivery, when it refers to
the outbound.
connection, and Exim is configured to request a certificate from the client,
the value of the Distinguished Name of the certificate is made available in the
&$tls_in_peerdn$& during subsequent processing.
+.new
If certificate verification fails it may refer to a failing chain element
which is not the leaf.
+.wen
The deprecated &$tls_peerdn$& variable refers to the inbound side
except when used in the context of an outbound SMTP delivery, when it refers to
connection, and Exim is configured to request a certificate from the server,
the value of the Distinguished Name of the certificate is made available in the
&$tls_out_peerdn$& during subsequent processing.
+.new
If certificate verification fails it may refer to a failing chain element
which is not the leaf.
+.wen
.vitem &$tls_in_sni$&
.vindex "&$tls_in_sni$&"
.row &%dns_ipv4_lookup%& "only v4 lookup for these domains"
.row &%dns_retrans%& "parameter for resolver"
.row &%dns_retry%& "parameter for resolver"
-.row &%dns_trust_aa%& "nameservers trusted as authentic"
+.row &%dns_trust_aa%& "DNS zones trusted as authentic"
.row &%dns_use_edns0%& "parameter for resolver"
.row &%hold_domains%& "hold delivery for these domains"
.row &%local_interfaces%& "for routing checks"
processed and the message itself has been received, but before the
acknowledgment is sent. See chapter &<<CHAPACL>>& for further details.
+.new
.option acl_smtp_dkim main string&!! unset
.cindex DKIM "ACL for"
This option defines the ACL that is run for each DKIM signature
of a received message.
See chapter &<<CHAPdkim>>& for further details.
+.wen
.option acl_smtp_etrn main string&!! unset
.cindex "ETRN" "ACL for"
extension. It defines the ACL that is run for each MIME part in a message. See
section &<<SECTscanmimepart>>& for details.
+.new
.option acl_smtp_notquit main string&!! unset
.cindex "not-QUIT, ACL for"
This option defines the ACL that is run when an SMTP session
ends without a QUIT command being received.
See chapter &<<CHAPACL>>& for further details.
+.wen
.option acl_smtp_predata main string&!! unset
This option defines the ACL that is run when an SMTP DATA command is
It appears that more and more DNS zone administrators are breaking the rules
and putting domain names that look like IP addresses on the right hand side of
MX records. Exim follows the rules and rejects this, giving an error message
-that explains the mis-configuration. However, some other MTAs support this
+that explains the misconfiguration. However, some other MTAs support this
practice, so to avoid &"Why can't Exim do this?"& complaints,
&%allow_mx_to_ip%& exists, in order to enable this heinous activity. It is not
recommended, except when you have no other choice.
to handle IPv6 literal addresses.
+.new
.option dkim_verify_signers main "domain list&!!" $dkim_signers
.cindex DKIM "controlling calls to the ACL"
This option gives a list of DKIM domains for which the DKIM ACL is run.
It is expanded after the message is received; by default it runs
the ACL once for each signature in the message.
See chapter &<<CHAPdkim>>&.
+.wen
.option dns_again_means_nonexist main "domain list&!!" unset
parameter values are available in the external resolver interface structure,
but nowhere does it seem to describe how they are used or what you might want
to set in them.
+.new
See also the &%slow_lookup_log%& option.
+.wen
.option dns_retry main integer 0
See &%dns_retrans%& above.
-.option dns_trust_aa main domain list&!! unset
+.new
+.option dns_trust_aa main "domain list&!!" unset
.cindex "DNS" "resolver options"
.cindex "DNS" "DNSSEC"
-If this option is set then lookup results marked with an AA bit
-(Authoratative Answer) are trusted when they come from one
-of the listed domains, as if they were marked as having been
-DNSSEC-verified.
-
-Use this option only if you talk directly to the resolver
-for your local domains, and list only it.
-It is needed when the resolver does not return an AD bit
-for its local domains.
-The first SOA or NS record appearing in the results is compared
-against the option value.
-
+If this option is set then lookup results marked with the AA bit
+(Authoritative Answer) are trusted the same way as if they were
+DNSSEC-verified. The authority section's name of the answer must
+match with this expanded domain list.
+
+Use this option only if you talk directly to a resolver that is
+authoritative for some zones and does not set the AD (Authentic Data)
+bit in the answer. Some DNS servers may have an configuration option to
+mark the answers from their own zones as verified (they set the AD bit).
+Others do not have this option. It is considered as poor practice using
+a resolver that is an authoritative server for some zones.
+
+Use this option only if you really have to (e.g. if you want
+to use DANE for remote delivery to a server that is listed in the DNS
+zones that your resolver is authoritative for).
+
+If the DNS answer packet has the AA bit set and contains resource record
+in the answer section, the name of the first NS record appearing in the
+authority section is compared against the list. If the answer packet is
+authoritative but the answer section is empty, the name of the first SOA
+record in the authoritative section is used instead.
+.wen
.cindex "DNS" "resolver options"
.option dns_use_edns0 main integer -1
Exim's transports have an option for adding an &'Envelope-to:'& header to a
message when it is delivered, in exactly the same way as &'Return-path:'& is
handled. &'Envelope-to:'& records the original recipient address from the
-messages's envelope that caused the delivery to happen. Such headers should not
+message's envelope that caused the delivery to happen. Such headers should not
be present in incoming messages, and this option causes them to be removed at
the time the message is received, to avoid any problems that might occur when a
delivered message is subsequently sent on to some other recipient.
maximum size that your virus-scanner is configured to support, you may get
failures triggered by large mails. The right size to configure for the
virus-scanner depends upon what data is passed and the options in use but it's
-probably safest to just set it to a little larger than this value. Eg, with a
+probably safest to just set it to a little larger than this value. E.g., with a
default Exim message size of 50M and a default ClamAV StreamMaxLength of 10M,
some problems may result.
This option can be used to enable the Per-Recipient Data Response extension
to SMTP, defined by Eric Hall.
If the option is set, PRDR is advertised by Exim when operating as a server.
-If the client requests PRDR, and more than one recipient, for a message
+If the client requests PRDR, and more than one recipient, for a message
an additional ACL is called for each recipient after the message content
-is recieved. See section &<<SECTPRDRACL>>&.
+is received. See section &<<SECTPRDRACL>>&.
.option preserve_message_logs main boolean false
.cindex "message logs" "preserving"
using TCP/IP), and the &%-bnq%& option was not set.
+.new
.option slow_lookup_log main integer 0
.cindex "logging" "slow lookups"
.cindex "dns" "logging slow lookups"
If the value is nonzero it is taken as a number of milliseconds
and lookups taking longer than this are logged.
Currently this applies only to DNS lookups.
+.wen
The former means that Exim was expecting to read an SMTP command; the latter
means that it was in the DATA phase, reading the contents of a message.
+.new
If the first character of the option is a &"$"& the option is
expanded before use and may depend on
&$sender_host_name$&, &$sender_host_address$& and &$sender_host_port$&.
+.wen
.oindex "&%-os%&"
acceptable bound from 1024 to 2048.
+.new
.option tls_eccurve main string&!! prime256v1
.cindex TLS "EC cryptography"
If built with a recent-enough version of OpenSSL,
which tell the library to choose.
If the option is set to an empty string, no EC curves will be enabled.
+.wen
.option tls_ocsp_file main string&!! unset
and will be taken as empty; an explicit location
must be specified.
-The use of a directory for the option value is not avilable for GnuTLS versions
+The use of a directory for the option value is not available for GnuTLS versions
preceding 3.3.6 and a single file must be used.
With OpenSSL the certificates specified
unless you really, really know what you are doing. See also the generic
transport option of the same name.
+.new
.option dnssec_request_domains routers "domain list&!!" unset
.cindex "MX record" "security"
.cindex "DNSSEC" "MX lookup"
the dnssec request bit set. Any returns not having the Authenticated Data bit
(AD bit) set will be ignored and logged as a host-lookup failure.
This applies to all of the SRV, MX, AAAA, A lookup sequence.
+.wen
.option domains routers&!? "domain list&!!" unset
routers, and this can lead to problems with duplicates -- see the similar
warning for &%headers_add%& above.
+.new
+&*Warning 3*&: Because of the separate expansion of the list items,
+items that contain a list separator must have it doubled.
+To avoid this, change the list separator (&<<SECTlistsepchange>>&).
+.wen
+
+
.option ignore_target_hosts routers "host list&!!" unset
.cindex "IP address" "discarding"
.section "Problems with DNS lookups" "SECTprowitdnsloo"
There have been problems with DNS servers when SRV records are looked up.
-Some mis-behaving servers return a DNS error or timeout when a non-existent
+Some misbehaving servers return a DNS error or timeout when a non-existent
SRV record is sought. Similar problems have in the past been reported for
MX records. The global &%dns_again_means_nonexist%& option can help with this
problem, but it is heavy-handed because it is a global option.
an address; if such a router is expected to handle "all remaining non-local
domains", then it is important to set &%no_more%&.
+.new
The router will defer rather than decline if the domain
is found in the &%fail_defer_domains%& router option.
+.wen
Reasons for a &(dnslookup)& router to decline currently include:
.ilist
+.new
.option fail_defer_domains dnslookup "domain list&!!" unset
.cindex "MX record" "not found"
DNS lookups for domains matching &%fail_defer_domains%&
domain while the DNS configuration is not ready.
However, it will result in any message with mistyped domains
also being queued.
+.wen
.option mx_domains dnslookup "domain list&!!" unset
.cindex "black hole"
.cindex "abandoning mail"
&':blackhole:'& can be used. It does what its name implies. No delivery is
-done, and no error message is generated. This has the same effect as specifing
+done, and no error message is generated. This has the same effect as specifying
&_/dev/null_& as a destination, but it can be independently disabled.
&*Warning*&: If &':blackhole:'& appears anywhere in a redirection list, no
Unlike most options, &%headers_remove%& can be specified multiple times
for a router; all listed headers are removed.
+&*Warning*&: Because of the separate expansion of the list items,
+items that contain a list separator must have it doubled.
+To avoid this, change the list separator (&<<SECTlistsepchange>>&).
+
.option headers_rewrite transports string unset
.cindex "DNS" "DNSSEC"
DNS lookups for domains matching &%dnssec_request_domains%& will be done with
the dnssec request bit set. Any returns not having the Authenticated Data bit
-(AD bit) set wil be ignored and logged as a host-lookup failure.
+(AD bit) set will be ignored and logged as a host-lookup failure.
This applies to all of the SRV, MX, AAAA, A lookup sequence.
deliveries into closed message stores. Exim also has support for running LMTP
over a pipe to a local process &-- see chapter &<<CHAPLMTP>>&.
-If this option is set to &"smtps"&, the default vaule for the &%port%& option
+If this option is set to &"smtps"&, the default value for the &%port%& option
changes to &"smtps"&, and the transport initiates TLS immediately after
connecting, as an outbound SSL-on-connect, instead of using STARTTLS to upgrade.
The Internet standards bodies strongly discourage use of this mode.
is taken as empty and an explicit location
must be specified.
-The use of a directory for the option value is not avilable for GnuTLS versions
+The use of a directory for the option value is not available for GnuTLS versions
preceding 3.3.6 and a single file must be used.
.wen
&$host_address$& are set to the name and address of the server during the
expansion of this option. See chapter &<<CHAPTLS>>& for details of TLS.
-For back-compatability,
+For back-compatibility,
if neither tls_verify_hosts nor tls_try_verify_hosts are set
(a single-colon empty list counts as being set)
and certificate verification fails the TLS connection is closed.
legitimate reasons for this (host died, network died), but if it repeats a lot
for the same host, it indicates something odd.
+.new
.vitem &%lookup%&
A DNS lookup for a host failed.
Note that a &%dnslookup%& router will need to have matched
its &%fail_defer_domains%& option for this retry type to be usable.
Also note that a &%manualroute%& router will probably need
its &%host_find_failed%& option set to &%defer%&.
+.wen
.vitem &%refused_MX%&
A connection to a host obtained from an MX record was refused.
the PLAIN authentication mechanism (RFC 2595) or the LOGIN mechanism, which is
not formally documented, but used by several MUAs. The seventh authenticator
supports Microsoft's &'Secure Password Authentication'& mechanism.
+.new
The eighth is an Exim authenticator but not an SMTP one;
instead it can use information from a TLS negotiation.
+.wen
The authenticators are configured using the same syntax as other drivers (see
section &<<SECTfordricon>>&). If no authenticators are required, no
.option client_set_id authenticators string&!! unset
When client authentication succeeds, this condition is expanded; the
-result is used in the log lines for outbound messasges.
+result is used in the log lines for outbound messages.
Typically it will be the user name used for authentication.
.option server_service heimdal_gssapi string&!! "smtp"
This option specifies the service identifier used, in conjunction with
-&%server_hostname%&, for building the identifer for finding credentials
+&%server_hostname%&, for building the identifier for finding credentials
from the keytab.
If an authenticator of this type is configured it is
run before any SMTP-level communication is done,
and can authenticate the connection.
-If it does, SMTP suthentication is not offered.
+If it does, SMTP authentication is not offered.
A maximum of one authenticator of this type may be present.
These may be the system default set (depending on library version),
.wen
a file or,
-depnding on liibrary version, a directory,
+depending on library version, a directory,
must name a file or,
for OpenSSL only (not GnuTLS), a directory.
The client verifies the server's certificate
within and possibly choose to use different certificates and keys (and more)
for this session.
-This is analagous to HTTP's &"Host:"& header, and is the main mechanism by
+This is analogous to HTTP's &"Host:"& header, and is the main mechanism by
which HTTPS-enabled web-sites can be virtual-hosted, many sites to one IP
address.
The Exim developers are proceeding cautiously and so far no other TLS options
are re-expanded.
-When Exim is built againt OpenSSL, OpenSSL must have been built with support
+When Exim is built against OpenSSL, OpenSSL must have been built with support
for TLS Extensions. This holds true for OpenSSL 1.0.0+ and 0.9.8+ with
enable-tlsext in EXTRACONFIGURE. If you invoke &(openssl s_client -h)& and
see &`-servername`& in the output, then OpenSSL has support.
client and server for a message, and more than one recipient
has been accepted.
-The ACL test specfied by &%acl_smtp_data_prdr%& happens after a message
-has been recieved, and is executed once for each recipient of the message
+The ACL test specified by &%acl_smtp_data_prdr%& happens after a message
+has been received, and is executed once for each recipient of the message
with &$local_part$& and &$domain$& valid.
-The test may accept, defer or deny for inividual recipients.
+The test may accept, defer or deny for individual recipients.
The &%acl_smtp_data%& will still be called after this ACL and
can reject the message overall, even if this ACL has accepted it
for some or all recipients.
for this can be disabled when the MAIL-time $smtp_command included
"PRDR". Any required difference in behaviour of the main DATA-time
ACL should however depend on the PRDR-time ACL having run, as Exim
-will avoid doing so in some situations (eg. single-recipient mails).
+will avoid doing so in some situations (e.g. single-recipient mails).
See also the &%prdr_enable%& global option
and the &%hosts_try_prdr%& smtp transport option.
.cindex "QUIT, ACL for"
The ACL for the SMTP QUIT command is anomalous, in that the outcome of the ACL
does not affect the response code to QUIT, which is always 221. Thus, the ACL
-does not in fact control any access. For this reason, it may only accept
+does not in fact control any access.
+.new
+For this reason, it may only accept
or warn as its final result.
+.wen
This ACL can be used for tasks such as custom logging at the end of an SMTP
session. For example, you can use ACL variables in other ACLs to count
This option requests delivery be attempted while the item is being received.
The option is usable in the RCPT ACL.
-If enabled for a message recieved via smtp and routed to an smtp transport,
+If enabled for a message received via smtp and routed to an smtp transport,
+.new
and only one transport, interface, destination host and port combination
is used for all recipients of the message,
+.wen
then the delivery connection is made while the receiving connection is open
and data is copied from one to the other.
for a mail will be quietly ignored.
If a recipient-verify callout connection is subsequently
requested in the same ACL it is held open and used for
-any subsequent receipients and the data,
+.new
+any subsequent recipients and the data,
+.wen
otherwise one is made after the initial RCPT ACL completes.
Note that routers are used in verify mode,
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 recieved with the SMTP PRDR option in use.
+.new
+It is not supported for messages received with the SMTP PRDR option in use.
+.wen
Should the ultimate destination system positively accept or reject the mail,
a corresponding indication is given to the source system and nothing is queued.
one of its aliases, does, when it is itself looked up in the DNS, yield the
original IP address.
+.new
There is one possible option, &`defer_ok`&. If this is present and a
DNS operation returns a temporary error, the verify condition succeeds.
+.wen
If this condition is used for a locally generated message (that is, when there
is no client host involved), it always succeeds.
.vitem &%avast%&
.cindex "virus scanners" "avast"
This is the scanner daemon of Avast. It has been tested with Avast Core
-Security (currenty at version 1.1.7).
+Security (currently at version 1.1.7).
You can get a trial version at &url(http://www.avast.com) or for Linux
at &url(http://www.avast.com/linux-server-antivirus).
This scanner type takes one option,
If you use a remote host,
you need to make Exim's spool directory available to it,
as the scanner is passed a file path, not file contents.
-For information about available commands and their options you may use
+For information about available commands and their options you may use
.code
$ socat UNIX:/var/run/avast/scan.sock STDIO:
FLAGS
This is a general-purpose way of talking to simple scanner daemons
running on the local machine.
There are four options:
-an address (which may be an IP addres and port, or the path of a Unix socket),
+an address (which may be an IP address and port, or the path of a Unix socket),
a commandline to send (may include a single %s which will be replaced with
the path to the mail file to be scanned),
an RE to trigger on from the returned data,
.new
Support is also provided for Rspamd.
-For more information about installation and configuration of SpamAssassin or
+For more information about installation and configuration of SpamAssassin or
Rspamd refer to their respective websites at
&url(http://spamassassin.apache.org) and &url(http://www.rspamd.com)
.wen
nicely, however.
.oindex "&%spamd_address%&"
-By default, SpamAssassin listens on 127.0.0.1, TCP port 783 and if you
+By default, SpamAssassin listens on 127.0.0.1, TCP port 783 and if you
intend to use an instance running on the local host you do not need to set
&%spamd_address%&. If you intend to use another host or port for SpamAssassin,
you must set the &%spamd_address%& option in the global part of the Exim
The &`pri`& option specifies a priority for the server within the list,
higher values being tried first.
-The deafult priority is 1.
+The default priority is 1.
The &`weight`& option specifies a selection bias.
Within a priority set
characters, may be omitted and will be taken as zero.
Timeout specifications for the &`retry`& and &`tmo`& options
-are the usual Exim time interval standard, eg. &`20s`& or &`1m`&.
+are the usual Exim time interval standard, e.g. &`20s`& or &`1m`&.
The &`tmo`& option specifies an overall timeout for communication.
The default value is two minutes.
The name allows you to use per-domain or per-user antispam profiles in
principle, but this is not straightforward in practice, because a message may
have multiple recipients, not necessarily all in the same domain. Because the
-&%spam%& condition has to be called from a DATA ACL in order to be able to
+&%spam%& condition has to be called from a DATA-time ACL in order to be able to
read the contents of the message, the variables &$local_part$& and &$domain$&
are not set.
+.new
Careful enforcement of single-recipient messages
-(eg. by responding with defer in the recipient ACL for all recipients
+(e.g. by responding with defer in the recipient ACL for all recipients
after the first),
or the use of PRDR,
.cindex "PRDR" "use for per-user SpamAssassin profiles"
are needed to use this feature.
+.wen
The right-hand side of the &%spam%& condition is expanded before being used, so
you can put lookups or conditions there. When the right-hand side evaluates to
.cindex "spam scanning" "returned variables"
When the &%spam%& condition is run, it sets up a number of expansion
-variables. These variables are saved with the received message, thus they are
+variables.
+.new
+Except for &$spam_report$&,
+.wen
+these variables are saved with the received message so are
available for use at delivery time.
.vlist
.vitem &$spam_report$&
A multiline text table, containing the full SpamAssassin report for the
message. Useful for inclusion in headers or reject messages.
+.new
+This variable is only usable in a DATA-time ACL.
+.wen
.new
.vitem &$spam_action$&
This is perhaps the most important of the MIME variables. It contains a
proposed filename for an attachment, if one was found in either the
&'Content-Type:'& or &'Content-Disposition:'& headers. The filename will be
-RFC2047 or RFC2231 decoded, but no additional sanity checks are done.
+RFC2047
+.new
+or RFC2231
+.wen
+decoded, but no additional sanity checks are done.
If no filename was
found, this variable contains the empty string.
&`*etrn `& ETRN commands
&`*host_lookup_failed `& as it says
&` ident_timeout `& timeout for ident connection
+.new
&` incoming_interface `& local interface on <= and => lines
+.wen
&` incoming_port `& remote port on <= lines
&`*lost_incoming_connection `& as it says (includes timeouts)
&` outgoing_port `& add remote port to => lines
&`*size_reject `& rejection because too big
&`*skip_delivery `& delivery skipped in a queue run
&`*smtp_confirmation `& SMTP confirmation on => lines
-&` smtp_connection `& SMTP connections
+&` smtp_connection `& incoming SMTP connections
&` smtp_incomplete_transaction`& incomplete SMTP transactions
&` smtp_mailauth `& AUTH argument to MAIL commands
&` smtp_no_mail `& session with no MAIL commands
followed by a colon and the port number. The local interface and port are also
added to other SMTP log lines, for example &"SMTP connection from"& and to
rejection lines
+.new
and (despite the name) the local interface is added to &"=>"& lines..
+.wen
.next
.cindex "log" "incoming remote port"
.cindex "port" "logging remote"
.next
.cindex "log" "SMTP connections"
.cindex "SMTP" "logging connections"
-&%smtp_connection%&: A log line is written whenever an SMTP connection is
+&%smtp_connection%&: A log line is written whenever an incoming SMTP connection is
established or closed, unless the connection is from a host that matches
&%hosts_connection_nolog%&. (In contrast, &%lost_incoming_connection%& applies
only when the closure is unexpected.) This applies to connections from local
shows that the client issued QUIT straight after EHLO. If there were fewer
than 20 commands, they are all listed. If there were more than 20 commands,
the last 20 are listed, preceded by &"..."&. However, with the default
-setting of 10 for &%smtp_accep_max_nonmail%&, the connection will in any case
+setting of 10 for &%smtp_accept_max_nonmail%&, the connection will in any case
have been aborted before 20 non-mail commands are processed.
.next
&%smtp_mailauth%&: A third subfield with the authenticated sender,
The &*-C*& option is used to specify an alternate &_exim.conf_& which might
contain alternate exim configuration the queue management might be using.
-to obtain a queue listing, and then greps the output to select messages
+to obtain a queue listing, and then greps the output to select messages
that match given criteria. The following selection options are available:
.vlist
exiqgrep -f '^<>$'
.endd
.vitem &*-r*&&~<&'regex'&>
-Match a recipient address using a case-insensitve search. The field that is
+Match a recipient address using a case-insensitive search. The field that is
tested is not enclosed in angle brackets.
.vitem &*-s*&&~<&'regex'&>
Administrators who use embedded Perl are advised to explore how Perl's
taint checking might apply to their usage.
.next
-Use of &%${expand...}%& is somewhat analagous to shell's eval builtin and
+Use of &%${expand...}%& is somewhat analogous to shell's eval builtin and
administrators are well advised to view its use with suspicion, in case (for
instance) it allows a local-part to contain embedded Exim directives.
.next
&%acl_smtp_dkim%& ACL. By default, this ACL is called once for each
syntactically(!) correct signature in the incoming message.
A missing ACL definition defaults to accept.
-If any ACL call does not acccept, the message is not accepted.
+If any ACL call does not accept, the message is not accepted.
If a cutthrough delivery was in progress for the message it is
summarily dropped (having wasted the transmission effort).
&%pass%&: The signature passed verification. It is valid.
.endlist
.vitem &%$dkim_verify_reason%&
-A string giving a litte bit more detail when &%$dkim_verify_status%& is either
+A string giving a little bit more detail when &%$dkim_verify_status%& is either
"fail" or "invalid". One of
.ilist
&%pubkey_unavailable%& (when &%$dkim_verify_status%&="invalid"): The public
projects / exim.git / blobdiff