X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/f1e494e0021f2efbc346a24727b8ebc66733e4b2..38965d80d70cacd0c944d32f7107549a3a272b35:/doc/doc-txt/experimental-spec.txt?ds=sidebyside

diff --git a/doc/doc-txt/experimental-spec.txt b/doc/doc-txt/experimental-spec.txt
index 47cd93f3d..aa3a278fd 100644
--- a/doc/doc-txt/experimental-spec.txt
+++ b/doc/doc-txt/experimental-spec.txt
@@ -292,62 +292,6 @@ These four steps are explained in more details below.
 
 
 
-SRS (Sender Rewriting Scheme) Support (using libsrs_alt)
---------------------------------------------------------------
-See also the main docs, for an alternative native support implementation.
-
-Exim can be built with SRS support using Miles  Wilton's
-libsrs_alt library. The current version of the supported
-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
-
-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
-
-EXPERIMENTAL_SRS_ALT=yes
-
-in your Local/Makefile.
-
-The built-in support, included by SUPPORT_SRS,
-shuold *not* be enabled if you wish to use the libsrs_alt
-version.
-
-The following main-section options become available:
-	srs_config		string
-	srs_hashlength		int
-	srs_hashmin		int
-	srs_maxage		int
-	srs_secrets		string
-	srs_usehash		bool
-	srs_usetimestamp	bool
-
-The redirect router gains these options (all of type string, unset by default):
-	srs
-	srs_alias
-	srs_condition
-	srs_dbinsert
-	srs_dbselect
-
-The following variables become available:
-	$srs_db_address
-	$srs_db_key
-	$srs_orig_recipient
-	$srs_orig_sender
-	$srs_recipient
-	$srs_status
-
-The predefined feature-macro _HAVE_SRS will be present.
-Additional delivery log line elements, tagged with "SRS=" will show the srs sender.	
-For configuration information see https://github.com/Exim/exim/wiki/SRS .
-
-
-
-
 DCC Support
 --------------------------------------------------------------
 Distributed Checksum Clearinghouse; http://www.rhyolite.com/dcc/
@@ -569,7 +513,9 @@ standard header.
   add_header = :at_start:${authresults {<admd-identifier>}}
 
 	Note that it would be wise to strip incoming messages of A-R headers
-	that claim to be from our own <admd-identifier>.
+	that claim to be from our own <admd-identifier>.  Eg:
+
+  remove_header = \N^(?i)Authentication-Results\s*::\s*example.org;\N
 
 There are four new variables:
 
@@ -670,7 +616,7 @@ and a whitespace-separated port number must be given.
 Logging protocol unusual states
 ---------------------------------------------------------------
 An extra log_selector, "protocol_detail" has been added in the default build.
-The name may change in future, hence the Experimenal status.
+The name may change in future, hence the Experimental status.
 
 Currrently the only effect is to enable logging, under TLS,
 of a TCP RST received directly after a QUIT (in server mode).
@@ -680,6 +626,38 @@ to its QUIT, not properly closing the TLS session and not properly closing
 the TCP connection.  Previously this resulted is an error from SSL_write
 being logged.
 
+
+
+XCLIENT proxy support
+---------------------------------------------------------------
+Per https://www.postfix.org/XCLIENT_README.html
+
+XCLIENT is an ESMTP extension supporting an inbound proxy.
+The only client immplementation known is in Nginx
+(https://nginx.org/en/docs/mail/ngx_mail_proxy_module.html)
+
+If compiled with EXPERIMENTAL_XCLIENT=yes :-
+
+As a server, Exim will advertise XCLIENT support (conditional on a new option
+"hosts_xclient") and service XCLIENT commands with parameters
+  ADDR
+  NAME
+  PORT
+  LOGIN
+  DESTADDR
+  DESTPORT
+A fresh HELO/EHLO is required after a succesful XCLIENT, and the usual
+values are derived from that (making the HELO and PROTO paramemters redundant).
+
+An XCLIENT command must give both ADDR and PORT parameters if no previous
+XCLIENT has succeeded in the SMTP session.
+
+After a success:
+  $proxy_session variable becomes "yes"
+  $proxy_local_address, $proxy_local_port have the proxy "inside" values
+  $proxy_external_address, $proxy_external_port have the proxy "outside" values
+  $sender_host_address, $sender_host_port have the remot client values
+
 --------------------------------------------------------------
 End of file
 --------------------------------------------------------------