Fix issue with continued-connections when the DNS shifts unreliably

[users/jgh/exim.git] / doc / doc-txt / experimental-spec.txt

diff --git a/doc/doc-txt/experimental-spec.txt b/doc/doc-txt/experimental-spec.txt
index 5213d8be46f3c5577cca13c1884321121e0dc2e8..db7a9a51da80fbdd63a17895f143ad0afcda07ae 100644 (file)
--- a/doc/doc-txt/experimental-spec.txt
+++ b/doc/doc-txt/experimental-spec.txt
@@ -6,7 +6,7 @@ about experimental  features, all  of which  are unstable and
 liable to incompatible change.
 
 
-Brightmail AntiSpam (BMI) suppport
+Brightmail AntiSpam (BMI) support
 --------------------------------------------------------------
 
 Brightmail  AntiSpam  is  a  commercial  package.  Please  see
@@ -42,7 +42,7 @@ These four steps are explained in more details below.
 1) Adding support for BMI at compile time
 
   To compile with BMI support,  you need to link Exim  against
-  the   Brighmail  client   SDK,  consisting   of  a   library
+  the  Brightmail  client   SDK,  consisting   of  a   library
   (libbmiclient_single.so)  and  a  header  file  (bmi_api.h).
   You'll also need to explicitly set a flag in the Makefile to
   include BMI support in the Exim binary. Both can be achieved
@@ -451,7 +451,7 @@ would relax host matching rules to a broader network range.
 A lookup expansion is also available. It takes an email
 address as the key and an IP address as the database:
 
-  $lookup (username@domain} spf {ip.ip.ip.ip}}
+  ${lookup {username@domain} spf {ip.ip.ip.ip}}
 
 The lookup will return the same result strings as they can appear in
 $spf_result (pass,fail,softfail,neutral,none,err_perm,err_temp).
@@ -464,11 +464,13 @@ SRS (Sender Rewriting Scheme) Support
 
 Exiscan  currently  includes SRS  support  via Miles  Wilton's
 libsrs_alt library. The current version of the supported
-library is 0.5.
+library is 0.5, there are reports of 1.0 working.
 
 In order to  use SRS, you  must get a  copy of libsrs_alt from
 
-http://srs.mirtol.com/
+https://opsec.eu/src/srs/
+
+(not the original source, which has disappeared.)
 
 Unpack the tarball, then refer to MTAs/README.EXIM
 to proceed. You need to set
@@ -478,6 +480,7 @@ EXPERIMENTAL_SRS=yes
 in your Local/Makefile.
 
 
+
 DCC Support
 --------------------------------------------------------------
 Distributed Checksum Clearinghouse; http://www.rhyolite.com/dcc/
@@ -550,7 +553,7 @@ Then set something like
 mout-xforward.gmx.net           82.165.159.12
 mout.gmx.net                    212.227.15.16
 
-Use a reasonable IP. eg. one the sending cluster acutally uses.
+Use a reasonable IP. eg. one the sending cluster actually uses.
 
 DMARC Support
 --------------------------------------------------------------
@@ -592,12 +595,14 @@ package controlled locations (/usr/include and /usr/lib).
 
 2. Use the following global settings to configure DMARC:
 
-Required:
+Optional:
 dmarc_tld_file      Defines the location of a text file of valid
                     top level domains the opendmarc library uses
                     during domain parsing. Maintained by Mozilla,
                     the most current version can be downloaded
                     from a link at http://publicsuffix.org/list/.
+                    If unset, "/etc/exim/opendmarc.tlds" (hardcoded)
+                    is used.
 
 Optional:
 dmarc_history_file  Defines the location of a file to log results
@@ -894,7 +899,7 @@ DANE will only be usable if the target host has DNSSEC-secured
 MX, A and TLSA records.
 
 A TLSA lookup will be done if either of the above options match
-and the host-lookup succeded using dnssec.
+and the host-lookup succeeded using dnssec.
 If a TLSA lookup is done and succeeds, a DANE-verified TLS connection
 will be required for the host.  If it does not, the host will not
 be used; there is no fallback to non-DANE or non-TLS.
@@ -923,6 +928,8 @@ verification succeeded using DANE and "no" otherwise (only useful
 in combination with EXPERIMENTAL_EVENT), and a new variable
 $tls_out_tlsa_usage (detailed above).
 
+Under GnuTLS, DANE is only supported from versin 3.0.0 onwards
+
 
 
 DSN extra information
@@ -960,7 +967,7 @@ The reporting MTA detailed diagnostic.
 Example:
   X-Exim-Diagnostic: X-str; SMTP error from remote mail server after RCPT TO:<d3@myhost.test.ex>: 550 hard error
 Rationale:
-  This string somtimes give extra information over the
+  This string sometimes give extra information over the
   existing (already available) Diagnostic-Code field.
 
 
@@ -970,7 +977,7 @@ Note that non-RFC-documented field names and data types are used.
 LMDB Lookup support
 -------------------
 LMDB is an ultra-fast, ultra-compact, crash-proof key-value embedded data store.
-It is modeled loosely on the BerkeleyDB API. You shoul read about the feature
+It is modeled loosely on the BerkeleyDB API. You should read about the feature
 set as well as operation modes at https://symas.com/products/lightning-memory-mapped-database/
 
 LMDB single key lookup support is provided by linking to the LMDB C library.