rf_get_transport

[user/henk/code/exim.git] / doc / doc-docbook / spec.xfpt

diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt
index 68d9c056f6623fb9c51c1987f1ae7f4262cf0c53..c594687162dd9179ec7e0cc2133451a833acb34f 100644 (file)
--- a/doc/doc-docbook/spec.xfpt
+++ b/doc/doc-docbook/spec.xfpt
@@ -14714,6 +14714,7 @@ listed in more than one group.
 .row &%notifier_socket%&             "override compiled-in value"
 .row &%pid_file_path%&               "override compiled-in value"
 .row &%queue_run_max%&               "maximum simultaneous queue runners"
+.row &%smtp_backlog_monitor%&        "level to log listen backlog"
 .endtable
 
 
@@ -17732,6 +17733,14 @@ messages, it is also used as the default for HELO commands in callout
 verification if there is no remote transport from which to obtain a
 &%helo_data%& value.
 
+.option smtp_backlog_monitor main integer 0
+.cindex "connection backlog" monitoring
+If this option is set to greater than zero, and the backlog of available
+TCP connections on a socket listening for SMTP is larger than it, a line
+is logged giving the value and the socket address and port.
+The value is retrived jsut before an accept call.
+This facility is only available on Linux.
+
 .option smtp_banner main string&!! "see below"
 .cindex "SMTP" "welcome banner"
 .cindex "banner for SMTP"
@@ -17762,7 +17771,7 @@ is zero). If there isn't enough space, a temporary error code is returned.
 
 
 .option smtp_connect_backlog main integer 20
-.cindex "connection backlog"
+.cindex "connection backlog" "set maximum"
 .cindex "SMTP" "connection backlog"
 .cindex "backlog of connections"
 This option specifies a maximum number of waiting SMTP connections. Exim passes
@@ -21515,7 +21524,7 @@ The text is not included in the response to an EXPN command. In non-SMTP cases
 the text is included in the error message that Exim generates.
 
 .cindex "SMTP" "error codes"
-By default, Exim sends a 451 SMTP code for a &':defer:'&, and 550 for
+By default for verify, Exim sends a 451 SMTP code for a &':defer:'&, and 550 for
 &':fail:'&. However, if the message starts with three digits followed by a
 space, optionally followed by an extended code of the form &'n.n.n'&, also
 followed by a space, and the very first digit is the same as the default error
@@ -25632,6 +25641,11 @@ There will be no fallback to in-clear communication.
 See the &%dnssec_request_domains%& router and transport options.
 See section &<<SECDANE>>&.
 
+.option hosts_require_helo smtp "host list&!!" *
+.cindex "HELO/EHLO" requiring
+Exim will require an accepted HELO or EHLO command from a host matching
+this list, before accepting a MAIL command.
+
 .option hosts_require_ocsp smtp "host list&!!" unset
 .cindex "TLS" "requiring for certain servers"
 Exim will request, and check for a valid Certificate Status being given, on a