X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/afaf5a50b05810d75c1f7ae9d1cd83697815a997..af0fd7f3c9e7bcf632309fcba36fc5f93d2a0044:/doc/doc-txt/experimental-spec.txt

diff --git a/doc/doc-txt/experimental-spec.txt b/doc/doc-txt/experimental-spec.txt
index e4a9301c3..dbd57d698 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/
@@ -672,7 +616,7 @@ 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.
 
-Currrently the only effect is to enable logging, under OpenSSL,
+Currrently the only effect is to enable logging, under TLS,
 of a TCP RST received directly after a QUIT (in server mode).
 
 Outlook is consistently doing this; not waiting for the SMTP response
@@ -680,6 +624,42 @@ 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.
 
+
+
+Limits ESMTP extension
+---------------------------------------------------------------
+Per https://datatracker.ietf.org/doc/html/draft-freed-smtp-limits-01
+
+If compiled with EXPERIMENTAL_ESMTP_LIMITS=yes :-
+
+As a server, Exim will advertise, in the EHLO response, the limit for RCPT
+commands set by the recipients_max main-section config option (if it is set),
+and the limit for MAIL commands set by the smtp_accept_max_per_connection
+option.
+
+Note that as of writing, smtp_accept_max_per_connection is expanded but
+recipients_max is not.
+
+A new main-section option "limits_advertise_hosts" controls whether
+the limits are advertised; the default for the option is "*".
+
+As a client, Exim will:
+
+ - note an advertised MAILMAX; the lower of the value given and the
+ value from the transport connection_max_messages option is used.
+
+ - note an advertised RCPTMAX; the lower of the
+ value given and the value from the transport max_rcpt option is used.
+ Parallisation of transactions is not done if due to a RCPTMAX, unlike
+ max_rcpt.
+
+ - note an advertised RCPTDOMAINMAX, and behave as if the transport
+ multi_domains option was set to false.  The value advertised is ignored.
+
+Values advertised are only noted for TLS connections and ones for which
+the server does not advertise TLS support.
+
+
 --------------------------------------------------------------
 End of file
 --------------------------------------------------------------