.oindex "&%-bmalware%&"
.cindex "testing", "malware"
.cindex "malware scan test"
-This debugging option causes Exim to scan the given file,
+This debugging option causes Exim to scan the given file or directory
+(depending on the used scanner interface),
using the malware scanning framework. The option of &%av_scanner%& influences
this option, so if &%av_scanner%&'s value is dependent upon an expansion then
the expansion should have defaults which apply to this invocation. ACLs are
This causes any temporarily failing address to be retried every 15 minutes for
2 hours, then at intervals starting at one hour and increasing by a factor of
1.5 until 16 hours have passed, then every 6 hours up to 4 days. If an address
-is not delivered after 4 days of temporary failure, it is bounced.
+is not delivered after 4 days of temporary failure, it is bounced. The time is
+measured from first failure, not from the time the message was received.
If the retry section is removed from the configuration, or is empty (that is,
if no retry rules are defined), Exim will not retry deliveries. This turns
.endlist ilist
-.section "Query-style lookup types" "SECID62"
+.section "Query-style lookup types" "SECTquerystylelookups"
.cindex "lookup" "query-style types"
.cindex "query-style lookup" "list of types"
The supported query-style lookup types are listed below. Further details about
qualified host name. See also &$smtp_active_hostname$&.
+.new
.vitem &$proxy_external_address$& &&&
&$proxy_external_port$& &&&
&$proxy_local_address$& &&&
These variables are only available when built with Proxy Protocol
or Socks5 support
For details see chapter &<<SECTproxyInbound>>&.
+.wen
.vitem &$prdr_requested$&
.cindex "PRDR" "variable for"
response to EHLO only to those client hosts that match this option. See
chapter &<<CHAPTLS>>& for details of Exim's support for TLS.
Note that the default value requires that a certificate be supplied
-using the &%tls_certificate%& option. If no certificate is available then
-the &%tls_advertise_hosts%& option should be set empty.
+using the &%tls_certificate%& option. If TLS support for incoming connections
+is not required the &%tls_advertise_hosts%& option should be set empty.
.option tls_certificate main string&!! unset
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"
.cindex "certificate" "revocation list for server"
If a STARTTLS command is issued within an existing TLS session, it is
rejected with a 554 error code.
-To enable TLS operations on a server, you must set &%tls_advertise_hosts%& to
-match some hosts. You can, of course, set it to * to match all hosts.
-However, this is not all you need to do. TLS sessions to a server won't work
-without some further configuration at the server end.
+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.
It is rumoured that all existing clients that support TLS/SSL use RSA
encryption. To make this work you need to set, in the server,
&`CV `& certificate verification status
&`D `& duration of &"no mail in SMTP session"&
&`DN `& distinguished name from peer certificate
+&`DS `& DNSSEC secured lookups
&`DT `& on &`=>`& lines: time taken for a delivery
&`F `& sender address (on delivery lines)
&`H `& host name and IP address
&` deliver_time `& time taken to perform delivery
&` delivery_size `& add &`S=`&&'nnn'& to => lines
&`*dnslist_defer `& defers of DNS list (aka RBL) lookups
+&` dnssec `& DNSSEC secured lookups
&`*etrn `& ETRN commands
&`*host_lookup_failed `& as it says
&` ident_timeout `& timeout for ident connection
&%dnslist_defer%&: A log entry is written if an attempt to look up a host in a
DNS black list suffers a temporary error.
.next
+.cindex log dnssec
+.cindex dnssec logging
+&%dnssec%&: For message acceptance and (attempted) delivery log lines, when
+dns lookups gave secure results a tag of DS is added.
+For acceptance this covers the reverse and forward lookups for host name verification.
+It does not cover helo-name verification.
+For delivery this covers the SRV, MX, A and/or AAAA lookups.
+.next
.cindex "log" "ETRN commands"
.cindex "ETRN" "logging"
&%etrn%&: Every valid ETRN command that is received is logged, before the ACL
main configuration option to a hostlist; connections from these
hosts will use Proxy Protocol.
+.new
The following expansion variables are usable
(&"internal"& and &"external"& here refer to the interfaces
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
git://git.exim.org / users / jgh / exim.git / blobdiff